section.c File Reference

#include <ntoskrnl.h>
#include <cache/newcc.h>
#include <cache/section/newmm.h>
#include <debug.h>
#include <reactos/exeformat.h>
#include "ARM3/miarm.h"

Include dependency graph for section.c:

Go to the source code of this file.

Classes
struct	MM_SECTION_PAGEOUT_CONTEXT

Macros
#define	NDEBUG
#define	MmSetPageEntrySectionSegment(S, O, E)
#define	DIE(ARGS_)   { DPRINT ARGS_; goto l_Return; }

Functions
VOID NTAPI	_MmLockSectionSegment (PMM_SECTION_SEGMENT Segment, const char *file, int line)
VOID NTAPI	_MmUnlockSectionSegment (PMM_SECTION_SEGMENT Segment, const char *file, int line)
static PMM_SECTION_SEGMENT	MiGrabDataSection (PSECTION_OBJECT_POINTERS SectionObjectPointer)
PMM_IMAGE_SECTION_OBJECT	ImageSectionObjectFromSegment (PMM_SECTION_SEGMENT Segment)
NTSTATUS	MiMapViewInSystemSpace (IN PVOID Section, IN PVOID Session, OUT PVOID *MappedBase, IN OUT PSIZE_T ViewSize, IN PLARGE_INTEGER SectionOffset)
NTSTATUS NTAPI	MmCreateArm3Section (OUT PVOID *SectionObject, IN ACCESS_MASK DesiredAccess, IN POBJECT_ATTRIBUTES ObjectAttributes OPTIONAL, IN PLARGE_INTEGER InputMaximumSize, IN ULONG SectionPageProtection, IN ULONG AllocationAttributes, IN HANDLE FileHandle OPTIONAL, IN PFILE_OBJECT FileObject OPTIONAL)
NTSTATUS NTAPI	MmMapViewOfArm3Section (IN PVOID SectionObject, IN PEPROCESS Process, IN OUT PVOID *BaseAddress, IN ULONG_PTR ZeroBits, IN SIZE_T CommitSize, IN OUT PLARGE_INTEGER SectionOffset OPTIONAL, IN OUT PSIZE_T ViewSize, IN SECTION_INHERIT InheritDisposition, IN ULONG AllocationType, IN ULONG Protect)
	C_ASSERT (EXEFMT_LOAD_HEADER_SIZE >=sizeof(IMAGE_DOS_HEADER))
	C_ASSERT (sizeof(IMAGE_NT_HEADERS32)<=sizeof(IMAGE_NT_HEADERS64))
	C_ASSERT (TYPE_ALIGNMENT(IMAGE_NT_HEADERS32)==TYPE_ALIGNMENT(IMAGE_NT_HEADERS64))
	C_ASSERT (RTL_SIZEOF_THROUGH_FIELD(IMAGE_NT_HEADERS32, FileHeader)==RTL_SIZEOF_THROUGH_FIELD(IMAGE_NT_HEADERS64, FileHeader))
	C_ASSERT (FIELD_OFFSET(IMAGE_NT_HEADERS32, OptionalHeader)==FIELD_OFFSET(IMAGE_NT_HEADERS64, OptionalHeader))
	C_ASSERT (PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, Magic))
	C_ASSERT (PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, SectionAlignment))
	C_ASSERT (PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, FileAlignment))
	C_ASSERT (PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, Subsystem))
	C_ASSERT (PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, MinorSubsystemVersion))
	C_ASSERT (PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, MajorSubsystemVersion))
	C_ASSERT (PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, AddressOfEntryPoint))
	C_ASSERT (PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, SizeOfCode))
	C_ASSERT (PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, SizeOfHeaders))
NTSTATUS NTAPI	MiWritePage (PMM_SECTION_SEGMENT Segment, LONGLONG SegOffset, PFN_NUMBER Page)
NTSTATUS NTAPI	PeFmtCreateSection (IN CONST VOID *FileHeader, IN SIZE_T FileHeaderSize, IN PVOID File, OUT PMM_IMAGE_SECTION_OBJECT ImageSectionObject, OUT PULONG Flags, IN PEXEFMT_CB_READ_FILE ReadFileCb, IN PEXEFMT_CB_ALLOCATE_SEGMENTS AllocateSegmentsCb)
NTSTATUS	MmspWaitForFileLock (PFILE_OBJECT File)
VOID NTAPI	MmpFreePageFileSegment (PMM_SECTION_SEGMENT Segment)
static VOID NTAPI	FreeSegmentPage (PMM_SECTION_SEGMENT Segment, PLARGE_INTEGER Offset)
	_When_ (OldIrql==MM_NOIRQL, _IRQL_requires_max_(DISPATCH_LEVEL))
VOID NTAPI	MmSharePageEntrySectionSegment (PMM_SECTION_SEGMENT Segment, PLARGE_INTEGER Offset)
BOOLEAN NTAPI	MmUnsharePageEntrySectionSegment (PMEMORY_AREA MemoryArea, PMM_SECTION_SEGMENT Segment, PLARGE_INTEGER Offset, BOOLEAN Dirty, BOOLEAN PageOut, ULONG_PTR *InEntry)
static NTSTATUS	MiCopyFromUserPage (PFN_NUMBER DestPage, const VOID *SrcAddress)
static NTSTATUS NTAPI	MmMakeSegmentResident (_In_ PMM_SECTION_SEGMENT Segment, _In_ LONGLONG Offset, _In_ ULONG Length, _In_opt_ PLARGE_INTEGER ValidDataLength, _In_ BOOLEAN SetDirty)
static VOID	MmAlterViewAttributes (PMMSUPPORT AddressSpace, PVOID BaseAddress, SIZE_T RegionSize, ULONG OldType, ULONG OldProtect, ULONG NewType, ULONG NewProtect)
NTSTATUS NTAPI	MmNotPresentFaultSectionView (PMMSUPPORT AddressSpace, MEMORY_AREA *MemoryArea, PVOID Address, BOOLEAN Locked)
NTSTATUS NTAPI	MmAccessFaultSectionView (PMMSUPPORT AddressSpace, MEMORY_AREA *MemoryArea, PVOID Address, BOOLEAN Locked)
NTSTATUS NTAPI	MmProtectSectionView (PMMSUPPORT AddressSpace, PMEMORY_AREA MemoryArea, PVOID BaseAddress, SIZE_T Length, ULONG Protect, PULONG OldProtect)
NTSTATUS NTAPI	MmQuerySectionView (PMEMORY_AREA MemoryArea, PVOID Address, PMEMORY_BASIC_INFORMATION Info, PSIZE_T ResultLength)
VOID NTAPI	MmpDeleteSection (PVOID ObjectBody)
VOID NTAPI	MmpCloseSection (IN PEPROCESS Process OPTIONAL, IN PVOID Object, IN ACCESS_MASK GrantedAccess, IN ULONG ProcessHandleCount, IN ULONG SystemHandleCount)
NTSTATUS NTAPI	MmCreatePhysicalMemorySection (VOID)
NTSTATUS NTAPI	MmInitSectionImplementation (VOID)
static NTSTATUS NTAPI	MmCreateDataFileSection (PSECTION *SectionObject, ACCESS_MASK DesiredAccess, POBJECT_ATTRIBUTES ObjectAttributes, PLARGE_INTEGER UMaximumSize, ULONG SectionPageProtection, ULONG AllocationAttributes, PFILE_OBJECT FileObject, BOOLEAN GotFileHandle)
NTSTATUS NTAPI	ElfFmtCreateSection (IN CONST VOID *FileHeader, IN SIZE_T FileHeaderSize, IN PVOID File, OUT PMM_IMAGE_SECTION_OBJECT ImageSectionObject, OUT PULONG Flags, IN PEXEFMT_CB_READ_FILE ReadFileCb, IN PEXEFMT_CB_ALLOCATE_SEGMENTS AllocateSegmentsCb)
static PMM_SECTION_SEGMENT NTAPI	ExeFmtpAllocateSegments (IN ULONG NrSegments)
static NTSTATUS NTAPI	ExeFmtpReadFile (IN PVOID File, IN PLARGE_INTEGER Offset, IN ULONG Length, OUT PVOID *Data, OUT PVOID *AllocBase, OUT PULONG ReadSize)
static VOID NTAPI	MmspAssertSegmentsSorted (IN PMM_IMAGE_SECTION_OBJECT ImageSectionObject)
static VOID NTAPI	MmspAssertSegmentsNoOverlap (IN PMM_IMAGE_SECTION_OBJECT ImageSectionObject)
static VOID NTAPI	MmspAssertSegmentsPageAligned (IN PMM_IMAGE_SECTION_OBJECT ImageSectionObject)
static int __cdecl	MmspCompareSegments (const void *x, const void *y)
static VOID NTAPI	MmspSortSegments (IN OUT PMM_IMAGE_SECTION_OBJECT ImageSectionObject, IN ULONG Flags)
static BOOLEAN NTAPI	MmspCheckSegmentBounds (IN OUT PMM_IMAGE_SECTION_OBJECT ImageSectionObject, IN ULONG Flags)
static BOOLEAN NTAPI	MmspPageAlignSegments (IN OUT PMM_IMAGE_SECTION_OBJECT ImageSectionObject, IN ULONG Flags)
NTSTATUS	ExeFmtpCreateImageSection (PFILE_OBJECT FileObject, PMM_IMAGE_SECTION_OBJECT ImageSectionObject)
NTSTATUS	MmCreateImageSection (PSECTION *SectionObject, ACCESS_MASK DesiredAccess, POBJECT_ATTRIBUTES ObjectAttributes, PLARGE_INTEGER UMaximumSize, ULONG SectionPageProtection, ULONG AllocationAttributes, PFILE_OBJECT FileObject)
static NTSTATUS	MmMapViewOfSegment (PMMSUPPORT AddressSpace, BOOLEAN AsImage, PMM_SECTION_SEGMENT Segment, PVOID *BaseAddress, SIZE_T ViewSize, ULONG Protect, LONGLONG ViewOffset, ULONG AllocationType)
static VOID	MmFreeSectionPage (PVOID Context, MEMORY_AREA *MemoryArea, PVOID Address, PFN_NUMBER Page, SWAPENTRY SwapEntry, BOOLEAN Dirty)
static NTSTATUS	MmUnmapViewOfSegment (PMMSUPPORT AddressSpace, PVOID BaseAddress)
NTSTATUS NTAPI	MiRosUnmapViewOfSection (IN PEPROCESS Process, IN PVOID BaseAddress, IN BOOLEAN SkipDebuggerNotify)
NTSTATUS NTAPI	NtQuerySection (_In_ HANDLE SectionHandle, _In_ SECTION_INFORMATION_CLASS SectionInformationClass, _Out_ PVOID SectionInformation, _In_ SIZE_T SectionInformationLength, _Out_opt_ PSIZE_T ResultLength)
NTSTATUS NTAPI	MmMapViewOfSection (IN PVOID SectionObject, IN PEPROCESS Process, IN OUT PVOID *BaseAddress, IN ULONG_PTR ZeroBits, IN SIZE_T CommitSize, IN OUT PLARGE_INTEGER SectionOffset OPTIONAL, IN OUT PSIZE_T ViewSize, IN SECTION_INHERIT InheritDisposition, IN ULONG AllocationType, IN ULONG Protect)
BOOLEAN NTAPI	MmCanFileBeTruncated (_In_ PSECTION_OBJECT_POINTERS SectionObjectPointer, _In_opt_ PLARGE_INTEGER NewFileSize)
static BOOLEAN	MiPurgeImageSegment (PMM_SECTION_SEGMENT Segment)
BOOLEAN NTAPI	MmFlushImageSection (IN PSECTION_OBJECT_POINTERS SectionObjectPointer, IN MMFLUSH_TYPE FlushType)
NTSTATUS NTAPI	MmMapViewInSystemSpace (IN PVOID SectionObject, OUT PVOID *MappedBase, IN OUT PSIZE_T ViewSize)
NTSTATUS NTAPI	MmMapViewInSystemSpaceEx (_In_ PVOID SectionObject, _Outptr_result_bytebuffer_(*ViewSize) PVOID *MappedBase, _Inout_ PSIZE_T ViewSize, _Inout_ PLARGE_INTEGER SectionOffset, _In_ ULONG_PTR Flags)
NTSTATUS NTAPI	MiRosUnmapViewInSystemSpace (IN PVOID MappedBase)
NTSTATUS NTAPI	MmCreateSection (OUT PVOID *Section, IN ACCESS_MASK DesiredAccess, IN POBJECT_ATTRIBUTES ObjectAttributes OPTIONAL, IN PLARGE_INTEGER MaximumSize, IN ULONG SectionPageProtection, IN ULONG AllocationAttributes, IN HANDLE FileHandle OPTIONAL, IN PFILE_OBJECT FileObject OPTIONAL)
BOOLEAN NTAPI	MmArePagesResident (_In_ PEPROCESS Process, _In_ PVOID Address, _In_ ULONG Length)
BOOLEAN NTAPI	MmPurgeSegment (_In_ PSECTION_OBJECT_POINTERS SectionObjectPointer, _In_opt_ PLARGE_INTEGER Offset, _In_ ULONG Length)
NTSTATUS NTAPI	MmMakeDataSectionResident (_In_ PSECTION_OBJECT_POINTERS SectionObjectPointer, _In_ LONGLONG Offset, _In_ ULONG Length, _In_ PLARGE_INTEGER ValidDataLength)
NTSTATUS NTAPI	MmFlushSegment (_In_ PSECTION_OBJECT_POINTERS SectionObjectPointer, _In_opt_ PLARGE_INTEGER Offset, _In_ ULONG Length, _Out_opt_ PIO_STATUS_BLOCK Iosb)
	_Requires_exclusive_lock_held_ (Segment->Lock) BOOLEAN NTAPI MmCheckDirtySegment(PMM_SECTION_SEGMENT Segment
	ASSERT (Segment->Locked)
	ASSERT ((Offset->QuadPart % PAGE_SIZE)==0)
	DPRINT ("Checking segment for file %wZ at offset 0x%I64X.\n", &Segment->FileObject->FileName, Offset->QuadPart)
	if (Entry==0)
	if (!IS_DIRTY_SSE(Entry) &&(SHARE_COUNT_FROM_SSE(Entry)==0) &&PageOut)
NTSTATUS NTAPI	MmMakePagesDirty (_In_ PEPROCESS Process, _In_ PVOID Address, _In_ ULONG Length)
NTSTATUS NTAPI	MmExtendSection (_In_ PVOID _Section, _Inout_ PLARGE_INTEGER NewSize)

Variables
MMSESSION	MmSession
static LARGE_INTEGER	TinyTime = {{-1L, -1L}}
KEVENT	MmWaitPageEvent
POBJECT_TYPE	MmSectionObjectType = NULL
ULONG_PTR	MmSubsectionBase
static ULONG	SectionCharacteristicsToProtect [16]
ACCESS_MASK	MmMakeFileAccess [8]
static GENERIC_MAPPING	MmpSectionMapping
static PEXEFMT_LOADER	ExeFmtpLoaders []
PLARGE_INTEGER	Offset
PLARGE_INTEGER BOOLEAN	ForceDirty
PLARGE_INTEGER BOOLEAN BOOLEAN	PageOut
NTSTATUS	Status
PFN_NUMBER	Page
	Entry = MmGetPageEntrySectionSegment(Segment, Offset)
return	FALSE

Macro Definition Documentation

DIE

#define DIE

(

ARGS_

)

{ DPRINT ARGS_; goto l_Return; }

MmSetPageEntrySectionSegment

#define MmSetPageEntrySectionSegment	(		S,
			O,
			E
	)

Value:

        do { \
        DPRINT("SetPageEntrySectionSegment(old,%p,%x,%x)\n",(S),(O)->LowPart,E); \
        _MmSetPageEntrySectionSegment((S),(O),(E),__FILE__,__LINE__);   \
    } while (0)

Definition at line 56 of file section.c.

NDEBUG

#define NDEBUG

Definition at line 49 of file section.c.

Function Documentation

_MmLockSectionSegment()

VOID NTAPI _MmLockSectionSegment	(	PMM_SECTION_SEGMENT	Segment,
		const char *	file,
		int	line
	)

Definition at line 70 of file section.c.

{
    //DPRINT("MmLockSectionSegment(%p,%s:%d)\n", Segment, file, line);
    ExAcquireFastMutex(&Segment->Lock);
    Segment->Locked = TRUE;
}

_MmUnlockSectionSegment()

VOID NTAPI _MmUnlockSectionSegment	(	PMM_SECTION_SEGMENT	Segment,
		const char *	file,
		int	line
	)

Definition at line 79 of file section.c.

{
    ASSERT(Segment->Locked);
    Segment->Locked = FALSE;
    ExReleaseFastMutex(&Segment->Lock);
    //DPRINT("MmUnlockSectionSegment(%p,%s:%d)\n", Segment, file, line);
}

_Requires_exclusive_lock_held_()

_Requires_exclusive_lock_held_

(

Segment->

Lock

)

_When_()

_When_	(	OldIrql	= = MM_NOIRQL,
		_IRQL_requires_max_(DISPATCH_LEVEL)
	)

Definition at line 988 of file section.c.

{
    /* Lock the PFN lock because we mess around with SectionObjectPointers */
    if (OldIrql == MM_NOIRQL)
    {
        OldIrql = MiAcquirePfnLock();
    }
 
    if (InterlockedDecrement64(Segment->ReferenceCount) > 0)
    {
        /* Nothing to do yet */
        MiReleasePfnLock(OldIrql);
        return;
    }
 
    *Segment->Flags |= MM_SEGMENT_INDELETE;
 
    /* Flush the segment */
    if (*Segment->Flags & MM_DATAFILE_SEGMENT)
    {
        MiReleasePfnLock(OldIrql);
        /* Free the page table. This will flush any remaining dirty data */
        MmFreePageTablesSectionSegment(Segment, FreeSegmentPage);
 
        OldIrql = MiAcquirePfnLock();
        /* Delete the pointer on the file */
        ASSERT(Segment->FileObject->SectionObjectPointer->DataSectionObject == Segment);
        Segment->FileObject->SectionObjectPointer->DataSectionObject = NULL;
        MiReleasePfnLock(OldIrql);
        ObDereferenceObject(Segment->FileObject);
 
        ExFreePoolWithTag(Segment, TAG_MM_SECTION_SEGMENT);
    }
    else
    {
        /* Most grotesque thing ever */
        PMM_IMAGE_SECTION_OBJECT ImageSectionObject = CONTAINING_RECORD(Segment->ReferenceCount, MM_IMAGE_SECTION_OBJECT, RefCount);
        PMM_SECTION_SEGMENT SectionSegments;
        ULONG NrSegments;
        ULONG i;
 
        /* Delete the pointer on the file */
        ASSERT(ImageSectionObject->FileObject->SectionObjectPointer->ImageSectionObject == ImageSectionObject);
        ImageSectionObject->FileObject->SectionObjectPointer->ImageSectionObject = NULL;
        MiReleasePfnLock(OldIrql);
 
        ObDereferenceObject(ImageSectionObject->FileObject);
 
        NrSegments = ImageSectionObject->NrSegments;
        SectionSegments = ImageSectionObject->Segments;
        for (i = 0; i < NrSegments; i++)
        {
            if (SectionSegments[i].Image.Characteristics & IMAGE_SCN_MEM_SHARED)
            {
                MmpFreePageFileSegment(&SectionSegments[i]);
            }
 
            MmFreePageTablesSectionSegment(&SectionSegments[i], NULL);
        }
 
        ExFreePoolWithTag(ImageSectionObject->Segments, TAG_MM_SECTION_SEGMENT);
        ExFreePoolWithTag(ImageSectionObject, TAG_MM_SECTION_SEGMENT);
    }
}

ASSERT() [1/2]

ASSERT

(

(Offset->QuadPart % PAGE_SIZE)

= =0

)

ASSERT() [2/2]

ASSERT

(

Segment->

Locked

)

C_ASSERT() [1/14]

C_ASSERT

(

EXEFMT_LOAD_HEADER_SIZE >=

sizeofIMAGE_DOS_HEADER

)

C_ASSERT() [2/14]

C_ASSERT

(

FIELD_OFFSET(IMAGE_NT_HEADERS32, OptionalHeader)

= =FIELD_OFFSET(IMAGE_NT_HEADERS64, OptionalHeader)

)

C_ASSERT() [3/14]

C_ASSERT

(

PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, AddressOfEntryPoint)

)

C_ASSERT() [4/14]

C_ASSERT

(

PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, FileAlignment)

)

C_ASSERT() [5/14]

C_ASSERT

(

PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, Magic)

)

C_ASSERT() [6/14]

C_ASSERT

(

PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, MajorSubsystemVersion)

)

C_ASSERT() [7/14]

C_ASSERT

(

PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, MinorSubsystemVersion)

)

C_ASSERT() [8/14]

C_ASSERT

(

PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, SectionAlignment)

)

C_ASSERT() [9/14]

C_ASSERT

(

PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, SizeOfCode)

)

C_ASSERT() [10/14]

C_ASSERT

(

PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, SizeOfHeaders)

)

C_ASSERT() [11/14]

C_ASSERT

(

PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, Subsystem)

)

C_ASSERT() [12/14]

C_ASSERT

(

RTL_SIZEOF_THROUGH_FIELD(IMAGE_NT_HEADERS32, FileHeader)

= =RTL_SIZEOF_THROUGH_FIELD(IMAGE_NT_HEADERS64, FileHeader)

)

C_ASSERT() [13/14]

C_ASSERT

(

sizeof(IMAGE_NT_HEADERS32)<=sizeof(IMAGE_NT_HEADERS64)

)

C_ASSERT() [14/14]

C_ASSERT

(

TYPE_ALIGNMENT(IMAGE_NT_HEADERS32)

= =TYPE_ALIGNMENT(IMAGE_NT_HEADERS64)

)

DPRINT()

DPRINT	(	"Checking segment for file %wZ at offset 0x%I64X.\n"	,
		&Segment->FileObject->	FileName,
		Offset->	QuadPart
	)

ElfFmtCreateSection()

NTSTATUS NTAPI ElfFmtCreateSection	(	IN CONST VOID *	FileHeader,
		IN SIZE_T	FileHeaderSize,
		IN PVOID	File,
		OUT PMM_IMAGE_SECTION_OBJECT	ImageSectionObject,
		OUT PULONG	Flags,
		IN PEXEFMT_CB_READ_FILE	ReadFileCb,
		IN PEXEFMT_CB_ALLOCATE_SEGMENTS	AllocateSegmentsCb
	)

ExeFmtpAllocateSegments()

static PMM_SECTION_SEGMENT NTAPI ExeFmtpAllocateSegments ( IN ULONG  NrSegments )

static

Definition at line 2590 of file section.c.

{
    SIZE_T SizeOfSegments;
    PMM_SECTION_SEGMENT Segments;
 
    /* TODO: check for integer overflow */
    SizeOfSegments = sizeof(MM_SECTION_SEGMENT) * NrSegments;
 
    Segments = ExAllocatePoolWithTag(NonPagedPool,
                                     SizeOfSegments,
                                     TAG_MM_SECTION_SEGMENT);
 
    if(Segments)
        RtlZeroMemory(Segments, SizeOfSegments);
 
    return Segments;
}

Referenced by ExeFmtpCreateImageSection().

ExeFmtpCreateImageSection()

NTSTATUS ExeFmtpCreateImageSection	(	PFILE_OBJECT	FileObject,
		PMM_IMAGE_SECTION_OBJECT	ImageSectionObject
	)

Definition at line 3024 of file section.c.

{
    LARGE_INTEGER Offset;
    PVOID FileHeader;
    PVOID FileHeaderBuffer;
    ULONG FileHeaderSize;
    ULONG Flags;
    ULONG OldNrSegments;
    NTSTATUS Status;
    ULONG i;
 
    /*
     * Read the beginning of the file (2 pages). Should be enough to contain
     * all (or most) of the headers
     */
    Offset.QuadPart = 0;
 
    Status = ExeFmtpReadFile (FileObject,
                              &Offset,
                              PAGE_SIZE * 2,
                              &FileHeader,
                              &FileHeaderBuffer,
                              &FileHeaderSize);
 
    if (!NT_SUCCESS(Status))
        return Status;
 
    if (FileHeaderSize == 0)
    {
        ExFreePool(FileHeaderBuffer);
        return STATUS_UNSUCCESSFUL;
    }
 
    /*
     * Look for a loader that can handle this executable
     */
    for (i = 0; i < RTL_NUMBER_OF(ExeFmtpLoaders); ++ i)
    {
        Flags = 0;
 
        Status = ExeFmtpLoaders[i](FileHeader,
                                   FileHeaderSize,
                                   FileObject,
                                   ImageSectionObject,
                                   &Flags,
                                   ExeFmtpReadFile,
                                   ExeFmtpAllocateSegments);
 
        if (!NT_SUCCESS(Status))
        {
            if (ImageSectionObject->Segments)
            {
                ExFreePool(ImageSectionObject->Segments);
                ImageSectionObject->Segments = NULL;
            }
        }
 
        if (Status != STATUS_ROS_EXEFMT_UNKNOWN_FORMAT)
            break;
    }
 
    ExFreePoolWithTag(FileHeaderBuffer, 'rXmM');
 
    /*
     * No loader handled the format
     */
    if (Status == STATUS_ROS_EXEFMT_UNKNOWN_FORMAT)
    {
        Status = STATUS_INVALID_IMAGE_NOT_MZ;
        ASSERT(!NT_SUCCESS(Status));
    }
 
    if (!NT_SUCCESS(Status))
        return Status;
 
    ASSERT(ImageSectionObject->Segments != NULL);
    ASSERT(ImageSectionObject->RefCount > 0);
 
    /*
     * Some defaults
     */
    /* FIXME? are these values platform-dependent? */
    if (ImageSectionObject->ImageInformation.MaximumStackSize == 0)
        ImageSectionObject->ImageInformation.MaximumStackSize = 0x40000;
 
    if(ImageSectionObject->ImageInformation.CommittedStackSize == 0)
        ImageSectionObject->ImageInformation.CommittedStackSize = 0x1000;
 
    if(ImageSectionObject->BasedAddress == NULL)
    {
        if(ImageSectionObject->ImageInformation.ImageCharacteristics & IMAGE_FILE_DLL)
            ImageSectionObject->BasedAddress = (PVOID)0x10000000;
        else
            ImageSectionObject->BasedAddress = (PVOID)0x00400000;
    }
 
    /*
     * And now the fun part: fixing the segments
     */
 
    /* Sort them by virtual address */
    MmspSortSegments(ImageSectionObject, Flags);
 
    /* Ensure they don't overlap in memory */
    if (!MmspCheckSegmentBounds(ImageSectionObject, Flags))
        return STATUS_INVALID_IMAGE_FORMAT;
 
    /* Ensure they are aligned */
    OldNrSegments = ImageSectionObject->NrSegments;
 
    if (!MmspPageAlignSegments(ImageSectionObject, Flags))
        return STATUS_INVALID_IMAGE_FORMAT;
 
    /* Trim them if the alignment phase merged some of them */
    if (ImageSectionObject->NrSegments < OldNrSegments)
    {
        PMM_SECTION_SEGMENT Segments;
        SIZE_T SizeOfSegments;
 
        SizeOfSegments = sizeof(MM_SECTION_SEGMENT) * ImageSectionObject->NrSegments;
 
        Segments = ExAllocatePoolWithTag(PagedPool,
                                         SizeOfSegments,
                                         TAG_MM_SECTION_SEGMENT);
 
        if (Segments == NULL)
            return STATUS_INSUFFICIENT_RESOURCES;
 
        RtlCopyMemory(Segments, ImageSectionObject->Segments, SizeOfSegments);
        ExFreePool(ImageSectionObject->Segments);
        ImageSectionObject->Segments = Segments;
    }
 
    /* And finish their initialization */
    for ( i = 0; i < ImageSectionObject->NrSegments; ++ i )
    {
        ExInitializeFastMutex(&ImageSectionObject->Segments[i].Lock);
        ImageSectionObject->Segments[i].ReferenceCount = &ImageSectionObject->RefCount;
        ImageSectionObject->Segments[i].Flags = &ImageSectionObject->SegFlags;
        MiInitializeSectionPageTable(&ImageSectionObject->Segments[i]);
        ImageSectionObject->Segments[i].FileObject = FileObject;
    }
 
    ASSERT(ImageSectionObject->RefCount > 0);
 
    ImageSectionObject->FileObject = FileObject;
 
    ASSERT(NT_SUCCESS(Status));
    return Status;
}

Referenced by MmCreateImageSection().

ExeFmtpReadFile()

static NTSTATUS NTAPI ExeFmtpReadFile ( IN PVOID  File, IN PLARGE_INTEGER  Offset, IN ULONG  Length, OUT PVOID *  Data, OUT PVOID *  AllocBase, OUT PULONG  ReadSize  )

static

Definition at line 2610 of file section.c.

{
    NTSTATUS Status;
    LARGE_INTEGER FileOffset;
    ULONG AdjustOffset;
    ULONG OffsetAdjustment;
    ULONG BufferSize;
    ULONG UsedSize;
    PVOID Buffer;
    PFILE_OBJECT FileObject = File;
    IO_STATUS_BLOCK Iosb;
 
    ASSERT_IRQL_LESS(DISPATCH_LEVEL);
 
    if(Length == 0)
    {
        KeBugCheck(MEMORY_MANAGEMENT);
    }
 
    FileOffset = *Offset;
 
    /* Negative/special offset: it cannot be used in this context */
    if(FileOffset.u.HighPart < 0)
    {
        KeBugCheck(MEMORY_MANAGEMENT);
    }
 
    AdjustOffset = PAGE_ROUND_DOWN(FileOffset.u.LowPart);
    OffsetAdjustment = FileOffset.u.LowPart - AdjustOffset;
    FileOffset.u.LowPart = AdjustOffset;
 
    BufferSize = Length + OffsetAdjustment;
    BufferSize = PAGE_ROUND_UP(BufferSize);
 
    /*
     * It's ok to use paged pool, because this is a temporary buffer only used in
     * the loading of executables. The assumption is that MmCreateSection is
     * always called at low IRQLs and that these buffers don't survive a brief
     * initialization phase
     */
    Buffer = ExAllocatePoolWithTag(PagedPool, BufferSize, 'rXmM');
    if (!Buffer)
    {
        return STATUS_INSUFFICIENT_RESOURCES;
    }
 
    Status = MiSimpleRead(FileObject, &FileOffset, Buffer, BufferSize, TRUE, &Iosb);
 
    UsedSize = (ULONG)Iosb.Information;
 
    if(NT_SUCCESS(Status) && UsedSize < OffsetAdjustment)
    {
        Status = STATUS_IN_PAGE_ERROR;
        ASSERT(!NT_SUCCESS(Status));
    }
 
    if(NT_SUCCESS(Status))
    {
        *Data = (PVOID)((ULONG_PTR)Buffer + OffsetAdjustment);
        *AllocBase = Buffer;
        *ReadSize = UsedSize - OffsetAdjustment;
    }
    else
    {
        ExFreePoolWithTag(Buffer, 'rXmM');
    }
 
    return Status;
}

Referenced by ExeFmtpCreateImageSection().

FreeSegmentPage()

static VOID NTAPI FreeSegmentPage ( PMM_SECTION_SEGMENT  Segment, PLARGE_INTEGER  Offset  )

static

Definition at line 960 of file section.c.

{
    ULONG_PTR Entry;
    PFN_NUMBER Page;
 
    MmLockSectionSegment(Segment);
 
    Entry = MmGetPageEntrySectionSegment(Segment, Offset);
 
    MmUnlockSectionSegment(Segment);
 
    /* This must be either a valid entry or nothing */
    ASSERT(!IS_SWAP_FROM_SSE(Entry));
 
    /* There should be no reference anymore */
    ASSERT(SHARE_COUNT_FROM_SSE(Entry) == 0);
 
    Page = PFN_FROM_SSE(Entry);
    /* If there is a page, this must be because it's still dirty */
    ASSERT(Page != 0);
 
    /* Write the page */
    if (IS_DIRTY_SSE(Entry))
        MiWritePage(Segment, Offset->QuadPart, Page);
 
    MmReleasePageMemoryConsumer(MC_USER, Page);
}

Referenced by _When_().

if() [1/2]

if

(

!IS_DIRTY_SSE(Entry) &&(SHARE_COUNT_FROM_SSE(Entry)==0) &&

PageOut

)

Definition at line 5179 of file section.c.

    {
        ULONG_PTR NewEntry = 0;
        /* Restore the swap entry here */
        if (!FlagOn(*Segment->Flags, MM_DATAFILE_SEGMENT))
        {
            SWAPENTRY SwapEntry = MmGetSavedSwapEntryPage(Page);
            if (SwapEntry)
                NewEntry = MAKE_SWAP_SSE(SwapEntry);
        }
 
        /* Yes. Release it */
        MmSetPageEntrySectionSegment(Segment, Offset, NewEntry);
        MmReleasePageMemoryConsumer(MC_USER, Page);
        /* Tell the caller we released the page */
        return TRUE;
    }

if() [2/2]

if

(

Entry

= = 0

)

Definition at line 5043 of file section.c.

    {
        BOOLEAN DirtyAgain;
 
        /*
         * We got a dirty entry. This path is for the shared data,
         * be-it regular file maps or shared sections of DLLs
         */
        ASSERT(FlagOn(*Segment->Flags, MM_DATAFILE_SEGMENT) ||
               FlagOn(Segment->Image.Characteristics, IMAGE_SCN_MEM_SHARED));
 
        /* Insert the cleaned entry back. Mark it as write in progress, and clear the dirty bit. */
        Entry = MAKE_SSE(PAGE_FROM_SSE(Entry), SHARE_COUNT_FROM_SSE(Entry) + 1);
        Entry = WRITE_SSE(Entry);
        MmSetPageEntrySectionSegment(Segment, Offset, Entry);
 
        MmUnlockSectionSegment(Segment);
 
        if (FlagOn(*Segment->Flags, MM_DATAFILE_SEGMENT))
        {
            PERESOURCE ResourceToRelease = NULL;
            KIRQL OldIrql;
 
            /* We have to write it back to the file. Tell the FS driver who we are */
            if (PageOut)
            {
                LARGE_INTEGER EndOffset = *Offset;
 
                ASSERT(IoGetTopLevelIrp() == NULL);
 
                /* We need to disable all APCs */
                KeRaiseIrql(APC_LEVEL, &OldIrql);
 
                EndOffset.QuadPart += PAGE_SIZE;
                Status = FsRtlAcquireFileForModWriteEx(Segment->FileObject,
                                                       &EndOffset,
                                                       &ResourceToRelease);
                if (NT_SUCCESS(Status))
                {
                    IoSetTopLevelIrp((PIRP)FSRTL_MOD_WRITE_TOP_LEVEL_IRP);
                }
                else
                {
                    /* Make sure we will not try to release anything */
                    ResourceToRelease = NULL;
                }
            }
            else
            {
                /* We don't have to lock. Say this is success */
                Status = STATUS_SUCCESS;
            }
 
            /* Go ahead and write the page, if previous locking succeeded */
            if (NT_SUCCESS(Status))
            {
                DPRINT("Writing page at offset %I64d for file %wZ, Pageout: %s\n",
                        Offset->QuadPart, &Segment->FileObject->FileName, PageOut ? "TRUE" : "FALSE");
                Status = MiWritePage(Segment, Offset->QuadPart, Page);
            }
 
            if (PageOut)
            {
                IoSetTopLevelIrp(NULL);
                if (ResourceToRelease != NULL)
                {
                    FsRtlReleaseFileForModWrite(Segment->FileObject, ResourceToRelease);
                }
                KeLowerIrql(OldIrql);
            }
        }
        else
        {
            /* This must only be called by the page-out path */
            ASSERT(PageOut);
 
            /* And this must be for a shared section in a DLL */
            ASSERT(FlagOn(Segment->Image.Characteristics, IMAGE_SCN_MEM_SHARED));
 
            SWAPENTRY SwapEntry = MmGetSavedSwapEntryPage(Page);
            if (!SwapEntry)
            {
                SwapEntry = MmAllocSwapPage();
            }
 
            if (SwapEntry)
            {
                Status = MmWriteToSwapPage(SwapEntry, Page);
                if (NT_SUCCESS(Status))
                {
                    MmSetSavedSwapEntryPage(Page, SwapEntry);
                }
                else
                {
                    MmFreeSwapPage(SwapEntry);
                }
            }
            else
            {
                DPRINT1("Failed to allocate a swap page!\n");
                Status = STATUS_INSUFFICIENT_RESOURCES;
            }
        }
 
        MmLockSectionSegment(Segment);
 
        /* Get the entry again */
        Entry = MmGetPageEntrySectionSegment(Segment, Offset);
        ASSERT(PFN_FROM_SSE(Entry) == Page);
 
        if (!NT_SUCCESS(Status))
        {
            /* Damn, this failed. Consider this page as still dirty */
            DPRINT1("MiWritePage FAILED: Status 0x%08x!\n", Status);
            DirtyAgain = TRUE;
        }
        else
        {
            /* Check if someone dirtified this page while we were not looking */
            DirtyAgain = IS_DIRTY_SSE(Entry);
        }
 
        /* Drop the reference we got, deleting the write altogether. */
        Entry = MAKE_SSE(Page << PAGE_SHIFT, SHARE_COUNT_FROM_SSE(Entry) - 1);
        if (DirtyAgain)
        {
            Entry = DIRTY_SSE(Entry);
        }
        MmSetPageEntrySectionSegment(Segment, Offset, Entry);
    }

ImageSectionObjectFromSegment()

PMM_IMAGE_SECTION_OBJECT ImageSectionObjectFromSegment

(

PMM_SECTION_SEGMENT

Segment

)

Definition at line 120 of file section.c.

{
    ASSERT((Segment->SegFlags & MM_DATAFILE_SEGMENT) == 0);
 
    return CONTAINING_RECORD(Segment->ReferenceCount, MM_IMAGE_SECTION_OBJECT, RefCount);
}

Referenced by MiRosUnmapViewOfSection().

MiCopyFromUserPage()

static NTSTATUS MiCopyFromUserPage ( PFN_NUMBER  DestPage, const VOID *  SrcAddress  )

static

Definition at line 1170 of file section.c.

{
    PEPROCESS Process;
    KIRQL Irql;
    PVOID DestAddress;
 
    Process = PsGetCurrentProcess();
    DestAddress = MiMapPageInHyperSpace(Process, DestPage, &Irql);
    if (DestAddress == NULL)
    {
        return STATUS_NO_MEMORY;
    }
    ASSERT((ULONG_PTR)DestAddress % PAGE_SIZE == 0);
    ASSERT((ULONG_PTR)SrcAddress % PAGE_SIZE == 0);
    RtlCopyMemory(DestAddress, SrcAddress, PAGE_SIZE);
    MiUnmapPageInHyperSpace(Process, DestAddress, Irql);
    return STATUS_SUCCESS;
}

Referenced by MmAccessFaultSectionView().

MiGrabDataSection()

static PMM_SECTION_SEGMENT MiGrabDataSection ( PSECTION_OBJECT_POINTERS  SectionObjectPointer )

static

Definition at line 90 of file section.c.

{
    KIRQL OldIrql = MiAcquirePfnLock();
    PMM_SECTION_SEGMENT Segment = NULL;
 
    while (TRUE)
    {
        Segment = SectionObjectPointer->DataSectionObject;
        if (!Segment)
            break;
 
        if (Segment->SegFlags & (MM_SEGMENT_INCREATE | MM_SEGMENT_INDELETE))
        {
            MiReleasePfnLock(OldIrql);
            KeDelayExecutionThread(KernelMode, FALSE, &TinyTime);
            OldIrql = MiAcquirePfnLock();
            continue;
        }
 
        ASSERT(Segment->SegFlags & MM_DATAFILE_SEGMENT);
        InterlockedIncrement64(&Segment->RefCount);
        break;
    }
 
    MiReleasePfnLock(OldIrql);
 
    return Segment;
}

Referenced by MmCanFileBeTruncated(), MmFlushSegment(), MmMakeDataSectionResident(), and MmPurgeSegment().

MiMapViewInSystemSpace()

NTSTATUS MiMapViewInSystemSpace	(	IN PVOID	Section,
		IN PVOID	Session,
		OUT PVOID *	MappedBase,
		IN OUT PSIZE_T	ViewSize,
		IN PLARGE_INTEGER	SectionOffset
	)

MiPurgeImageSegment()

static BOOLEAN MiPurgeImageSegment ( PMM_SECTION_SEGMENT  Segment )

static

Definition at line 4310 of file section.c.

{
    PCACHE_SECTION_PAGE_TABLE PageTable;
 
    MmLockSectionSegment(Segment);
 
    /* Loop over all entries */
    for (PageTable = RtlEnumerateGenericTable(&Segment->PageTable, TRUE);
         PageTable != NULL;
         PageTable = RtlEnumerateGenericTable(&Segment->PageTable, FALSE))
    {
        for (ULONG i = 0; i < _countof(PageTable->PageEntries); i++)
        {
            ULONG_PTR Entry = PageTable->PageEntries[i];
            LARGE_INTEGER Offset;
 
            if (!Entry)
                continue;
 
            if (IS_SWAP_FROM_SSE(Entry) || (SHARE_COUNT_FROM_SSE(Entry) > 0))
            {
                /* I/O ongoing or swap entry. Someone mapped this file as we were not looking */
                MmUnlockSectionSegment(Segment);
                return FALSE;
            }
 
            /* Regular entry */
            ASSERT(!IS_WRITE_SSE(Entry));
            ASSERT(MmGetSavedSwapEntryPage(PFN_FROM_SSE(Entry)) == 0);
 
            /* Properly remove using the used API */
            Offset.QuadPart = PageTable->FileOffset.QuadPart + (i << PAGE_SHIFT);
            MmSetPageEntrySectionSegment(Segment, &Offset, 0);
            MmReleasePageMemoryConsumer(MC_USER, PFN_FROM_SSE(Entry));
        }
    }
 
    MmUnlockSectionSegment(Segment);
 
    return TRUE;
}

Referenced by MmFlushImageSection().

MiRosUnmapViewInSystemSpace()

NTSTATUS NTAPI MiRosUnmapViewInSystemSpace

(

IN PVOID

MappedBase

)

Definition at line 4557 of file section.c.

{
    DPRINT("MmUnmapViewInSystemSpace() called\n");
 
    return MmUnmapViewOfSegment(MmGetKernelAddressSpace(), MappedBase);
}

Referenced by MmUnmapViewInSystemSpace().

MiRosUnmapViewOfSection()

NTSTATUS NTAPI MiRosUnmapViewOfSection	(	IN PEPROCESS	Process,
		IN PVOID	BaseAddress,
		IN BOOLEAN	SkipDebuggerNotify
	)

Definition at line 3589 of file section.c.

{
    NTSTATUS Status;
    PMEMORY_AREA MemoryArea;
    PMMSUPPORT AddressSpace;
    PVOID ImageBaseAddress = 0;
 
    DPRINT("Opening memory area Process %p BaseAddress %p\n",
           Process, BaseAddress);
 
    ASSERT(Process);
 
    AddressSpace = &Process->Vm;
 
    MemoryArea = MmLocateMemoryAreaByAddress(AddressSpace,
                 BaseAddress);
    if (MemoryArea == NULL ||
#ifdef NEWCC
            ((MemoryArea->Type != MEMORY_AREA_SECTION_VIEW) && (MemoryArea->Type != MEMORY_AREA_CACHE)) ||
#else
            (MemoryArea->Type != MEMORY_AREA_SECTION_VIEW) ||
#endif
            MemoryArea->DeleteInProgress)
 
    {
        if (MemoryArea) ASSERT(MemoryArea->Type != MEMORY_AREA_OWNED_BY_ARM3);
 
        DPRINT1("Unable to find memory area at address %p.\n", BaseAddress);
        return STATUS_NOT_MAPPED_VIEW;
    }
 
    if (MemoryArea->VadNode.u.VadFlags.VadType == VadImageMap)
    {
        ULONG i;
        ULONG NrSegments;
        PMM_IMAGE_SECTION_OBJECT ImageSectionObject;
        PMM_SECTION_SEGMENT SectionSegments;
        PMM_SECTION_SEGMENT Segment;
 
        Segment = MemoryArea->SectionData.Segment;
        ImageSectionObject = ImageSectionObjectFromSegment(Segment);
        SectionSegments = ImageSectionObject->Segments;
        NrSegments = ImageSectionObject->NrSegments;
 
        MemoryArea->DeleteInProgress = TRUE;
 
        /* Search for the current segment within the section segments
         * and calculate the image base address */
        for (i = 0; i < NrSegments; i++)
        {
            if (Segment == &SectionSegments[i])
            {
                ImageBaseAddress = (char*)BaseAddress - (ULONG_PTR)SectionSegments[i].Image.VirtualAddress;
                break;
            }
        }
        if (i >= NrSegments)
        {
            KeBugCheck(MEMORY_MANAGEMENT);
        }
 
        for (i = 0; i < NrSegments; i++)
        {
            PVOID SBaseAddress = (PVOID)
                                 ((char*)ImageBaseAddress + (ULONG_PTR)SectionSegments[i].Image.VirtualAddress);
 
            Status = MmUnmapViewOfSegment(AddressSpace, SBaseAddress);
            if (!NT_SUCCESS(Status))
            {
                DPRINT1("MmUnmapViewOfSegment failed for %p (Process %p) with %lx\n",
                        SBaseAddress, Process, Status);
                ASSERT(NT_SUCCESS(Status));
            }
        }
        DPRINT("One mapping less for %p\n", ImageSectionObject->FileObject->SectionObjectPointer);
        InterlockedDecrement(&ImageSectionObject->MapCount);
    }
    else
    {
        PMM_SECTION_SEGMENT Segment = MemoryArea->SectionData.Segment;
        PMMVAD Vad = &MemoryArea->VadNode;
        PCONTROL_AREA ControlArea  = Vad->ControlArea;
        PFILE_OBJECT FileObject;
        SIZE_T ViewSize;
        LARGE_INTEGER ViewOffset;
        ViewOffset.QuadPart = MemoryArea->SectionData.ViewOffset;
 
        InterlockedIncrement64(Segment->ReferenceCount);
 
        ViewSize = PAGE_SIZE + ((Vad->EndingVpn - Vad->StartingVpn) << PAGE_SHIFT);
 
        Status = MmUnmapViewOfSegment(AddressSpace, BaseAddress);
        if (!NT_SUCCESS(Status))
        {
            DPRINT1("MmUnmapViewOfSegment failed for %p (Process %p) with %lx\n",
                    BaseAddress, Process, Status);
            ASSERT(NT_SUCCESS(Status));
        }
 
        /* These might be deleted now */
        Vad = NULL;
        MemoryArea = NULL;
 
        if (FlagOn(*Segment->Flags, MM_PHYSICALMEMORY_SEGMENT))
        {
            /* Don't bother */
            MmDereferenceSegment(Segment);
            return STATUS_SUCCESS;
        }
        ASSERT(FlagOn(*Segment->Flags, MM_DATAFILE_SEGMENT));
 
        FileObject = Segment->FileObject;
        FsRtlAcquireFileExclusive(FileObject);
 
        /* Don't bother for auto-delete closed file. */
        if (FlagOn(FileObject->Flags, FO_DELETE_ON_CLOSE) && FlagOn(FileObject->Flags, FO_CLEANUP_COMPLETE))
        {
            FsRtlReleaseFile(FileObject);
            MmDereferenceSegment(Segment);
            return STATUS_SUCCESS;
        }
 
        /*
         * Flush only when last mapping is deleted.
         * FIXME: Why ControlArea == NULL? Or rather: is ControlArea ever not NULL here?
         */
        if (ControlArea == NULL || ControlArea->NumberOfMappedViews == 1)
        {
            while (ViewSize > 0)
            {
                ULONG FlushSize = min(ViewSize, PAGE_ROUND_DOWN(MAXULONG));
                MmFlushSegment(FileObject->SectionObjectPointer,
                               &ViewOffset,
                               FlushSize,
                               NULL);
                ViewSize -= FlushSize;
                ViewOffset.QuadPart += FlushSize;
            }
        }
 
        FsRtlReleaseFile(FileObject);
        MmDereferenceSegment(Segment);
    }
 
    /* Notify debugger */
    if (ImageBaseAddress && !SkipDebuggerNotify) DbgkUnMapViewOfSection(ImageBaseAddress);
 
    return STATUS_SUCCESS;
}

Referenced by MiRosCleanupMemoryArea(), and MiUnmapViewOfSection().

MiWritePage()

NTSTATUS NTAPI MiWritePage	(	PMM_SECTION_SEGMENT	Segment,
		LONGLONG	SegOffset,
		PFN_NUMBER	Page
	)

Definition at line 238 of file section.c.

{
    NTSTATUS Status;
    IO_STATUS_BLOCK IoStatus;
    KEVENT Event;
    UCHAR MdlBase[sizeof(MDL) + sizeof(PFN_NUMBER)];
    PMDL Mdl = (PMDL)MdlBase;
    PFILE_OBJECT FileObject = Segment->FileObject;
    LARGE_INTEGER FileOffset;
 
    FileOffset.QuadPart = Segment->Image.FileOffset + SegOffset;
 
    RtlZeroMemory(MdlBase, sizeof(MdlBase));
    MmInitializeMdl(Mdl, NULL, PAGE_SIZE);
    MmBuildMdlFromPages(Mdl, &Page);
    Mdl->MdlFlags |= MDL_PAGES_LOCKED;
 
    KeInitializeEvent(&Event, NotificationEvent, FALSE);
    Status = IoSynchronousPageWrite(FileObject, Mdl, &FileOffset, &Event, &IoStatus);
    if (Status == STATUS_PENDING)
    {
        KeWaitForSingleObject(&Event, Executive, KernelMode, FALSE, NULL);
        Status = IoStatus.Status;
    }
    if (Mdl->MdlFlags & MDL_MAPPED_TO_SYSTEM_VA)
    {
        MmUnmapLockedPages (Mdl->MappedSystemVa, Mdl);
    }
 
    return Status;
}

Referenced by FreeSegmentPage().

MmAccessFaultSectionView()

NTSTATUS NTAPI MmAccessFaultSectionView	(	PMMSUPPORT	AddressSpace,
		MEMORY_AREA *	MemoryArea,
		PVOID	Address,
		BOOLEAN	Locked
	)

Definition at line 1910 of file section.c.

{
    PMM_SECTION_SEGMENT Segment;
    PFN_NUMBER OldPage;
    PFN_NUMBER NewPage;
    PFN_NUMBER UnmappedPage;
    PVOID PAddress;
    LARGE_INTEGER Offset;
    PMM_REGION Region;
    ULONG_PTR Entry;
    PEPROCESS Process = MmGetAddressSpaceOwner(AddressSpace);
    BOOLEAN Cow = FALSE;
    ULONG NewProtect;
    BOOLEAN Unmapped;
    NTSTATUS Status;
 
    DPRINT("MmAccessFaultSectionView(%p, %p, %p)\n", AddressSpace, MemoryArea, Address);
 
    /* Get the region for this address */
    Region = MmFindRegion((PVOID)MA_GetStartingAddress(MemoryArea),
                        &MemoryArea->SectionData.RegionListHead,
                        Address, NULL);
    ASSERT(Region != NULL);
    if (!(Region->Protect & PAGE_IS_WRITABLE))
        return STATUS_ACCESS_VIOLATION;
 
    /* Make sure we have a page mapping for this address.  */
    if (!MmIsPagePresent(Process, Address))
    {
        NTSTATUS Status = MmNotPresentFaultSectionView(AddressSpace, MemoryArea, Address, Locked);
        if (!NT_SUCCESS(Status))
        {
            /* This is invalid access ! */
            return Status;
        }
    }
 
    /*
     * Check if the page has already been set readwrite
     */
    if (MmGetPageProtect(Process, Address) & (PAGE_READWRITE | PAGE_EXECUTE_READWRITE))
    {
        DPRINT("Address 0x%p\n", Address);
        return STATUS_SUCCESS;
    }
 
    /* Check if we are doing Copy-On-Write */
    Segment = MemoryArea->SectionData.Segment;
    Cow = Segment->WriteCopy || (Region->Protect & PAGE_IS_WRITECOPY);
 
    if (!Cow)
    {
        /* Simply update page protection and we're done */
        MmSetPageProtect(Process, Address, Region->Protect);
        return STATUS_SUCCESS;
    }
 
    /* Calculate the new protection & check if we should update the region */
    NewProtect = Region->Protect;
    if (NewProtect & PAGE_IS_WRITECOPY)
    {
        NewProtect &= ~PAGE_IS_WRITECOPY;
        if (Region->Protect & PAGE_IS_EXECUTABLE)
            NewProtect |= PAGE_EXECUTE_READWRITE;
        else
            NewProtect |= PAGE_READWRITE;
        MmAlterRegion(AddressSpace, (PVOID)MA_GetStartingAddress(MemoryArea),
                &MemoryArea->SectionData.RegionListHead,
                Address, PAGE_SIZE, Region->Type, NewProtect,
                MmAlterViewAttributes);
    }
 
    /*
     * Find the offset of the page
     */
    PAddress = MM_ROUND_DOWN(Address, PAGE_SIZE);
    Offset.QuadPart = (ULONG_PTR)PAddress - MA_GetStartingAddress(MemoryArea)
                      + MemoryArea->SectionData.ViewOffset;
 
    /* Get the page mapping this section offset. */
    MmLockSectionSegment(Segment);
    Entry = MmGetPageEntrySectionSegment(Segment, &Offset);
 
    /* Get the current page mapping for the process */
    ASSERT(MmIsPagePresent(Process, PAddress));
    OldPage = MmGetPfnForProcess(Process, PAddress);
    ASSERT(OldPage != 0);
 
    if (IS_SWAP_FROM_SSE(Entry) ||
            PFN_FROM_SSE(Entry) != OldPage)
    {
        MmUnlockSectionSegment(Segment);
        /* This is a private page. We must only change the page protection. */
        MmSetPageProtect(Process, PAddress, NewProtect);
        return STATUS_SUCCESS;
    }
 
    /*
     * Allocate a page
     */
    Status = MmRequestPageMemoryConsumer(MC_USER, TRUE, &NewPage);
    if (!NT_SUCCESS(Status))
    {
        MmUnlockSectionSegment(Segment);
        return STATUS_NO_MEMORY;
    }
 
    /*
     * Copy the old page
     */
    NT_VERIFY(NT_SUCCESS(MiCopyFromUserPage(NewPage, PAddress)));
 
    /*
     * Unshare the old page.
     */
    DPRINT("Swapping page (Old %x New %x)\n", OldPage, NewPage);
    Unmapped = MmDeleteVirtualMapping(Process, PAddress, NULL, &UnmappedPage);
    if (!Unmapped || (UnmappedPage != OldPage))
    {
        /* Uh , we had a page just before, but suddenly it changes. Someone corrupted us. */
        KeBugCheckEx(MEMORY_MANAGEMENT,
                    (ULONG_PTR)Process,
                    (ULONG_PTR)PAddress,
                    (ULONG_PTR)__FILE__,
                    __LINE__);
    }
 
    if (Process)
        MmDeleteRmap(OldPage, Process, PAddress);
    MmUnsharePageEntrySectionSegment(MemoryArea, Segment, &Offset, FALSE, FALSE, NULL);
    MmUnlockSectionSegment(Segment);
 
    /*
     * Set the PTE to point to the new page
     */
    if (!NT_SUCCESS(MmCreateVirtualMapping(Process, PAddress, NewProtect, NewPage)))
    {
        DPRINT1("MmCreateVirtualMapping failed, unable to create virtual mapping, not out of memory\n");
        KeBugCheck(MEMORY_MANAGEMENT);
    }
 
    if (Process)
        MmInsertRmap(NewPage, Process, PAddress);
 
    DPRINT("Address 0x%p\n", Address);
    return STATUS_SUCCESS;
}

Referenced by MmpAccessFault().

MmAlterViewAttributes()

static VOID MmAlterViewAttributes ( PMMSUPPORT  AddressSpace, PVOID  BaseAddress, SIZE_T  RegionSize, ULONG  OldType, ULONG  OldProtect, ULONG  NewType, ULONG  NewProtect  )

static

Definition at line 1446 of file section.c.

{
    PMEMORY_AREA MemoryArea;
    PMM_SECTION_SEGMENT Segment;
    BOOLEAN DoCOW = FALSE;
    ULONG i;
    PEPROCESS Process = MmGetAddressSpaceOwner(AddressSpace);
 
    MemoryArea = MmLocateMemoryAreaByAddress(AddressSpace, BaseAddress);
    ASSERT(MemoryArea != NULL);
    Segment = MemoryArea->SectionData.Segment;
    MmLockSectionSegment(Segment);
 
    if ((Segment->WriteCopy) &&
            (NewProtect == PAGE_READWRITE || NewProtect == PAGE_EXECUTE_READWRITE))
    {
        DoCOW = TRUE;
    }
 
    if (OldProtect != NewProtect)
    {
        for (i = 0; i < PAGE_ROUND_UP(RegionSize) / PAGE_SIZE; i++)
        {
            SWAPENTRY SwapEntry;
            PVOID Address = (char*)BaseAddress + (i * PAGE_SIZE);
            ULONG Protect = NewProtect;
 
            /* Wait for a wait entry to disappear */
            do
            {
                MmGetPageFileMapping(Process, Address, &SwapEntry);
                if (SwapEntry != MM_WAIT_ENTRY)
                    break;
                MmUnlockSectionSegment(Segment);
                MmUnlockAddressSpace(AddressSpace);
                KeDelayExecutionThread(KernelMode, FALSE, &TinyTime);
                MmLockAddressSpace(AddressSpace);
                MmLockSectionSegment(Segment);
            }
            while (TRUE);
 
            /*
             * If we doing COW for this segment then check if the page is
             * already private.
             */
            if (DoCOW && (MmIsPagePresent(Process, Address) || MmIsDisabledPage(Process, Address)))
            {
                LARGE_INTEGER Offset;
                ULONG_PTR Entry;
                PFN_NUMBER Page;
 
                Offset.QuadPart = (ULONG_PTR)Address - MA_GetStartingAddress(MemoryArea)
                                  + MemoryArea->SectionData.ViewOffset;
                Entry = MmGetPageEntrySectionSegment(Segment, &Offset);
                /*
                 * An MM_WAIT_ENTRY is ok in this case...  It'll just count as
                 * IS_SWAP_FROM_SSE and we'll do the right thing.
                 */
                Page = MmGetPfnForProcess(Process, Address);
 
                Protect = PAGE_READONLY;
                if (IS_SWAP_FROM_SSE(Entry) || PFN_FROM_SSE(Entry) != Page)
                {
                    Protect = NewProtect;
                }
            }
 
            if (MmIsPagePresent(Process, Address) || MmIsDisabledPage(Process, Address))
            {
                MmSetPageProtect(Process, Address,
                                 Protect);
            }
        }
    }
 
    MmUnlockSectionSegment(Segment);
}

Referenced by MmAccessFaultSectionView(), MmNotPresentFaultSectionView(), and MmProtectSectionView().

MmArePagesResident()

BOOLEAN NTAPI MmArePagesResident	(	_In_ PEPROCESS	Process,
		_In_ PVOID	Address,
		_In_ ULONG	Length
	)

Definition at line 4775 of file section.c.

{
    PMEMORY_AREA MemoryArea;
    BOOLEAN Ret = TRUE;
    PMM_SECTION_SEGMENT Segment;
    LARGE_INTEGER SegmentOffset, RangeEnd;
    PMMSUPPORT AddressSpace = Process ? &Process->Vm : MmGetKernelAddressSpace();
 
    MmLockAddressSpace(AddressSpace);
 
    MemoryArea = MmLocateMemoryAreaByAddress(AddressSpace, Address);
    if (MemoryArea == NULL)
    {
        MmUnlockAddressSpace(AddressSpace);
        return FALSE;
    }
 
    /* Only supported in old Mm for now */
    ASSERT(MemoryArea->Type == MEMORY_AREA_SECTION_VIEW);
    /* For file mappings */
    ASSERT(MemoryArea->VadNode.u.VadFlags.VadType != VadImageMap);
 
    Segment = MemoryArea->SectionData.Segment;
    MmLockSectionSegment(Segment);
 
    SegmentOffset.QuadPart = PAGE_ROUND_DOWN(Address) - MA_GetStartingAddress(MemoryArea)
            + MemoryArea->SectionData.ViewOffset;
    RangeEnd.QuadPart = PAGE_ROUND_UP((ULONG_PTR)Address + Length) - MA_GetStartingAddress(MemoryArea)
            + MemoryArea->SectionData.ViewOffset;
 
    while (SegmentOffset.QuadPart < RangeEnd.QuadPart)
    {
        ULONG_PTR Entry = MmGetPageEntrySectionSegment(Segment, &SegmentOffset);
        if ((Entry == 0) || IS_SWAP_FROM_SSE(Entry))
        {
            Ret = FALSE;
            break;
        }
        SegmentOffset.QuadPart += PAGE_SIZE;
    }
 
    MmUnlockSectionSegment(Segment);
 
    MmUnlockAddressSpace(AddressSpace);
    return Ret;
}

Referenced by CcRosEnsureVacbResident().

MmCanFileBeTruncated()

BOOLEAN NTAPI MmCanFileBeTruncated	(	_In_ PSECTION_OBJECT_POINTERS	SectionObjectPointer,
		_In_opt_ PLARGE_INTEGER	NewFileSize
	)

Definition at line 4255 of file section.c.

{
    BOOLEAN Ret;
    PMM_SECTION_SEGMENT Segment;
 
    /* Check whether an ImageSectionObject exists */
    if (SectionObjectPointer->ImageSectionObject != NULL)
    {
        DPRINT1("ERROR: File can't be truncated because it has an image section\n");
        return FALSE;
    }
 
    Segment = MiGrabDataSection(SectionObjectPointer);
    if (!Segment)
    {
        /* There is no data section. It's fine to do anything. */
        return TRUE;
    }
 
    MmLockSectionSegment(Segment);
    if ((Segment->SectionCount == 0) ||
        ((Segment->SectionCount == 1) && (SectionObjectPointer->SharedCacheMap != NULL)))
    {
        /* If the cache is the only one holding a reference to the segment, then it's fine to resize */
        Ret = TRUE;
    }
    else if (NewFileSize != NULL)
    {
        /* We can't shrink, but we can extend */
        Ret = NewFileSize->QuadPart >= Segment->RawLength.QuadPart;
#if DBG
        if (!Ret)
        {
            DPRINT1("Cannot truncate data: New Size %I64d, Segment Size %I64d\n", NewFileSize->QuadPart, Segment->RawLength.QuadPart);
        }
#endif
    }
    else
    {
        DPRINT1("ERROR: File can't be truncated because it has references held to its data section\n");
        Ret = FALSE;
    }
 
    MmUnlockSectionSegment(Segment);
    MmDereferenceSegment(Segment);
 
    DPRINT("FIXME: didn't check for outstanding write probes\n");
 
    return Ret;
}

Referenced by Ext2SetFileInformation(), Ext2SupersedeOrOverWriteFile(), NtfsSetEndOfFile(), open_file2(), RxCommonSetInformation(), set_end_of_file_information(), SetAttributeDataLength(), UDFCommonCreate(), UDFSetAllocationInformation(), UDFSetEOF(), VfatSetAllocationSizeInformation(), and VfatSetInformation().

MmCreateArm3Section()

NTSTATUS NTAPI MmCreateArm3Section	(	OUT PVOID *	SectionObject,
		IN ACCESS_MASK	DesiredAccess,
		IN POBJECT_ATTRIBUTES ObjectAttributes	OPTIONAL,
		IN PLARGE_INTEGER	InputMaximumSize,
		IN ULONG	SectionPageProtection,
		IN ULONG	AllocationAttributes,
		IN HANDLE FileHandle	OPTIONAL,
		IN PFILE_OBJECT FileObject	OPTIONAL
	)

Definition at line 2468 of file section.c.

{
    SECTION Section;
    PSECTION NewSection;
    PSUBSECTION Subsection;
    PSEGMENT NewSegment, Segment;
    NTSTATUS Status;
    PCONTROL_AREA ControlArea;
    ULONG ProtectionMask, ControlAreaSize, Size, NonPagedCharge, PagedCharge;
    KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
    BOOLEAN FileLock = FALSE, KernelCall = FALSE;
    KIRQL OldIrql;
    PFILE_OBJECT File;
    BOOLEAN UserRefIncremented = FALSE;
    PVOID PreviousSectionPointer;
 
    /* Make the same sanity checks that the Nt interface should've validated */
    ASSERT((AllocationAttributes & ~(SEC_COMMIT | SEC_RESERVE | SEC_BASED |
                                     SEC_LARGE_PAGES | SEC_IMAGE | SEC_NOCACHE |
                                     SEC_NO_CHANGE)) == 0);
    ASSERT((AllocationAttributes & (SEC_COMMIT | SEC_RESERVE | SEC_IMAGE)) != 0);
    ASSERT(!((AllocationAttributes & SEC_IMAGE) &&
             (AllocationAttributes & (SEC_COMMIT | SEC_RESERVE |
                                      SEC_NOCACHE | SEC_NO_CHANGE))));
    ASSERT(!((AllocationAttributes & SEC_COMMIT) && (AllocationAttributes & SEC_RESERVE)));
    ASSERT(!((SectionPageProtection & PAGE_NOCACHE) ||
             (SectionPageProtection & PAGE_WRITECOMBINE) ||
             (SectionPageProtection & PAGE_GUARD) ||
             (SectionPageProtection & PAGE_NOACCESS)));
 
    /* Convert section flag to page flag */
    if (AllocationAttributes & SEC_NOCACHE)
        SectionPageProtection |= PAGE_NOCACHE;
 
    /* Check to make sure the protection is correct. Nt* does this already */
    ProtectionMask = MiMakeProtectionMask(SectionPageProtection);
    if (ProtectionMask == MM_INVALID_PROTECTION)
    {
        DPRINT1("Invalid protection mask\n");
        return STATUS_INVALID_PAGE_PROTECTION;
    }
 
    /* Check if this is going to be a data or image backed file section */
    if ((FileHandle) || (FileObject))
    {
        /* These cannot be mapped with large pages */
        if (AllocationAttributes & SEC_LARGE_PAGES) return STATUS_INVALID_PARAMETER_6;
 
        /* For now, only support the mechanism through a file handle */
        ASSERT(FileObject == NULL);
 
        /* Reference the file handle to get the object */
        Status = ObReferenceObjectByHandle(FileHandle,
                                           MmMakeFileAccess[ProtectionMask],
                                           IoFileObjectType,
                                           PreviousMode,
                                           (PVOID*)&File,
                                           NULL);
        if (!NT_SUCCESS(Status)) return Status;
 
        /* Make sure Cc has been doing its job */
        if (!File->SectionObjectPointer)
        {
            /* This is not a valid file system-based file, fail */
            ObDereferenceObject(File);
            return STATUS_INVALID_FILE_FOR_SECTION;
        }
 
        /* Image-file backed sections are not yet supported */
        ASSERT((AllocationAttributes & SEC_IMAGE) == 0);
 
        /* Compute the size of the control area, and allocate it */
        ControlAreaSize = sizeof(CONTROL_AREA) + sizeof(MSUBSECTION);
        ControlArea = ExAllocatePoolWithTag(NonPagedPool, ControlAreaSize, 'aCmM');
        if (!ControlArea)
        {
            ObDereferenceObject(File);
            return STATUS_INSUFFICIENT_RESOURCES;
        }
 
        /* Zero it out */
        RtlZeroMemory(ControlArea, ControlAreaSize);
 
        /* Did we get a handle, or an object? */
        if (FileHandle)
        {
            /* We got a file handle so we have to lock down the file */
#if 0
            Status = FsRtlAcquireToCreateMappedSection(File, SectionPageProtection);
            if (!NT_SUCCESS(Status))
            {
                ExFreePool(ControlArea);
                ObDereferenceObject(File);
                return Status;
            }
#else
            /* ReactOS doesn't support this API yet, so do nothing */
            Status = STATUS_SUCCESS;
#endif
            /* Update the top-level IRP so that drivers know what's happening */
            IoSetTopLevelIrp((PIRP)FSRTL_FSP_TOP_LEVEL_IRP);
            FileLock = TRUE;
        }
 
        /* Lock the PFN database while we play with the section pointers */
        OldIrql = MiAcquirePfnLock();
 
        /* Image-file backed sections are not yet supported */
        ASSERT((AllocationAttributes & SEC_IMAGE) == 0);
 
        /* There should not already be a control area for this file */
        ASSERT(File->SectionObjectPointer->DataSectionObject == NULL);
        NewSegment = NULL;
 
        /* Write down that this CA is being created, and set it */
        ControlArea->u.Flags.BeingCreated = TRUE;
        ASSERT((AllocationAttributes & SEC_IMAGE) == 0);
        PreviousSectionPointer = File->SectionObjectPointer;
        File->SectionObjectPointer->DataSectionObject = ControlArea;
 
        /* We can release the PFN lock now */
        MiReleasePfnLock(OldIrql);
 
        /* We don't support previously-mapped file */
        ASSERT(NewSegment == NULL);
 
        /* Image-file backed sections are not yet supported */
        ASSERT((AllocationAttributes & SEC_IMAGE) == 0);
 
        /* So we always create a data file map */
        Status = MiCreateDataFileMap(File,
                                     &Segment,
                                     (PSIZE_T)InputMaximumSize,
                                     SectionPageProtection,
                                     AllocationAttributes,
                                     KernelCall);
        if (!NT_SUCCESS(Status))
        {
            /* Lock the PFN database while we play with the section pointers */
            OldIrql = MiAcquirePfnLock();
 
            /* Reset the waiting-for-deletion event */
            ASSERT(ControlArea->WaitingForDeletion == NULL);
            ControlArea->WaitingForDeletion = NULL;
 
            /* Set the file pointer NULL flag */
            ASSERT(ControlArea->u.Flags.FilePointerNull == 0);
            ControlArea->u.Flags.FilePointerNull = TRUE;
 
            /* Delete the data section object */
            ASSERT((AllocationAttributes & SEC_IMAGE) == 0);
            File->SectionObjectPointer->DataSectionObject = NULL;
 
            /* No longer being created */
            ControlArea->u.Flags.BeingCreated = FALSE;
 
            /* We can release the PFN lock now */
            MiReleasePfnLock(OldIrql);
 
            /* Check if we locked and set the IRP */
            if (FileLock)
            {
                /* Undo */
                IoSetTopLevelIrp(NULL);
                //FsRtlReleaseFile(File);
            }
 
            /* Free the control area and de-ref the file object */
            ExFreePool(ControlArea);
            ObDereferenceObject(File);
 
            /* All done */
            return Status;
        }
 
        /* On success, we expect this */
        ASSERT(PreviousSectionPointer == File->SectionObjectPointer);
 
        /* Check if a maximum size was specified */
        if (!InputMaximumSize->QuadPart)
        {
            /* Nope, use the segment size */
            Section.SizeOfSection.QuadPart = (LONGLONG)Segment->SizeOfSegment;
        }
        else
        {
            /* Yep, use the entered size */
            Section.SizeOfSection.QuadPart = InputMaximumSize->QuadPart;
        }
    }
    else
    {
        /* A handle must be supplied with SEC_IMAGE, as this is the no-handle path */
        if (AllocationAttributes & SEC_IMAGE) return STATUS_INVALID_FILE_FOR_SECTION;
 
        /* Not yet supported */
        ASSERT((AllocationAttributes & SEC_LARGE_PAGES) == 0);
 
        /* So this must be a pagefile-backed section, create the mappings needed */
        Status = MiCreatePagingFileMap(&NewSegment,
                                       InputMaximumSize,
                                       ProtectionMask,
                                       AllocationAttributes);
        if (!NT_SUCCESS(Status)) return Status;
 
        /* Set the size here, and read the control area */
        Section.SizeOfSection.QuadPart = NewSegment->SizeOfSegment;
        ControlArea = NewSegment->ControlArea;
 
        /* MiCreatePagingFileMap increments user references */
        UserRefIncremented = TRUE;
    }
 
    /* Did we already have a segment? */
    if (!NewSegment)
    {
        /* This must be the file path and we created a segment */
        NewSegment = Segment;
        ASSERT(File != NULL);
 
        /* Acquire the PFN lock while we set control area flags */
        OldIrql = MiAcquirePfnLock();
 
        /* We don't support this race condition yet, so assume no waiters */
        ASSERT(ControlArea->WaitingForDeletion == NULL);
        ControlArea->WaitingForDeletion = NULL;
 
        /* Image-file backed sections are not yet supported, nor ROM images */
        ASSERT((AllocationAttributes & SEC_IMAGE) == 0);
        ASSERT(Segment->ControlArea->u.Flags.Rom == 0);
 
        /* Take off the being created flag, and then release the lock */
        ControlArea->u.Flags.BeingCreated = FALSE;
        MiReleasePfnLock(OldIrql);
    }
 
    /* Check if we locked the file earlier */
    if (FileLock)
    {
        /* Reset the top-level IRP and release the lock */
        IoSetTopLevelIrp(NULL);
        //FsRtlReleaseFile(File);
        FileLock = FALSE;
    }
 
    /* Set the initial section object data */
    Section.InitialPageProtection = SectionPageProtection;
 
    /* The mapping created a control area and segment, save the flags */
    Section.Segment = NewSegment;
    Section.u.LongFlags = ControlArea->u.LongFlags;
 
    /* Check if this is a user-mode read-write non-image file mapping */
    if (!(FileObject) &&
        (SectionPageProtection & (PAGE_READWRITE | PAGE_EXECUTE_READWRITE)) &&
        !(ControlArea->u.Flags.Image) &&
        (ControlArea->FilePointer))
    {
        /* Add a reference and set the flag */
        Section.u.Flags.UserWritable = TRUE;
        InterlockedIncrement((volatile LONG*)&ControlArea->WritableUserReferences);
    }
 
    /* Check for image mappings or page file mappings */
    if ((ControlArea->u.Flags.Image) || !(ControlArea->FilePointer))
    {
        /* Charge the segment size, and allocate a subsection */
        PagedCharge = sizeof(SECTION) + NewSegment->TotalNumberOfPtes * sizeof(MMPTE);
        Size = sizeof(SUBSECTION);
    }
    else
    {
        /* Charge nothing, and allocate a mapped subsection */
        PagedCharge = 0;
        Size = sizeof(MSUBSECTION);
    }
 
    /* Check if this is a normal CA */
    ASSERT(ControlArea->u.Flags.GlobalOnlyPerSession == 0);
    ASSERT(ControlArea->u.Flags.Rom == 0);
 
    /* Charge only a CA, and the subsection is right after */
    NonPagedCharge = sizeof(CONTROL_AREA);
    Subsection = (PSUBSECTION)(ControlArea + 1);
 
    /* We only support single-subsection mappings */
    NonPagedCharge += Size;
    ASSERT(Subsection->NextSubsection == NULL);
 
    /* Create the actual section object, with enough space for the prototype PTEs */
    Status = ObCreateObject(PreviousMode,
                            MmSectionObjectType,
                            ObjectAttributes,
                            PreviousMode,
                            NULL,
                            sizeof(SECTION),
                            PagedCharge,
                            NonPagedCharge,
                            (PVOID*)&NewSection);
    if (!NT_SUCCESS(Status))
    {
        /* Check if this is a user-mode read-write non-image file mapping */
        if (!(FileObject) &&
            (SectionPageProtection & (PAGE_READWRITE | PAGE_EXECUTE_READWRITE)) &&
            !(ControlArea->u.Flags.Image) &&
            (ControlArea->FilePointer))
        {
            /* Remove a reference and check the flag */
            ASSERT(Section.u.Flags.UserWritable == 1);
            InterlockedDecrement((volatile LONG*)&ControlArea->WritableUserReferences);
        }
 
        /* Check if a user reference was added */
        if (UserRefIncremented)
        {
            /* Acquire the PFN lock while we change counters */
            OldIrql = MiAcquirePfnLock();
 
            /* Decrement the accounting counters */
            ControlArea->NumberOfSectionReferences--;
            ASSERT((LONG)ControlArea->NumberOfUserReferences > 0);
            ControlArea->NumberOfUserReferences--;
 
            /* Check if we should destroy the CA and release the lock */
            MiCheckControlArea(ControlArea, OldIrql);
        }
 
        /* Return the failure code */
        return Status;
    }
 
    /* NOTE: Past this point, all failures will be handled by Ob upon ref->0 */
 
    /* Now copy the local section object from the stack into this new object */
    RtlCopyMemory(NewSection, &Section, sizeof(SECTION));
    NewSection->Address.StartingVpn = 0;
 
    /* For now, only user calls are supported */
    ASSERT(KernelCall == FALSE);
    NewSection->u.Flags.UserReference = TRUE;
 
    /* Is this a "based" allocation, in which all mappings are identical? */
    if (AllocationAttributes & SEC_BASED)
    {
        /* Lock the VAD tree during the search */
        KeAcquireGuardedMutex(&MmSectionBasedMutex);
 
        /* Is it a brand new ControArea ? */
        if (ControlArea->u.Flags.BeingCreated == 1)
        {
            ASSERT(ControlArea->u.Flags.Based == 1);
            /* Then we must find a global address, top-down */
            Status = MiFindEmptyAddressRangeDownBasedTree((SIZE_T)ControlArea->Segment->SizeOfSegment,
                                                          (ULONG_PTR)MmHighSectionBase,
                                                          _64K,
                                                          &MmSectionBasedRoot,
                                                          (ULONG_PTR*)&ControlArea->Segment->BasedAddress);
 
            if (!NT_SUCCESS(Status))
            {
                /* No way to find a valid range. */
                KeReleaseGuardedMutex(&MmSectionBasedMutex);
                ControlArea->u.Flags.Based = 0;
                NewSection->u.Flags.Based = 0;
                ObDereferenceObject(NewSection);
                return Status;
            }
 
            /* Compute the ending address and insert it into the VAD tree */
            NewSection->Address.StartingVpn = (ULONG_PTR)ControlArea->Segment->BasedAddress;
            NewSection->Address.EndingVpn = NewSection->Address.StartingVpn + NewSection->SizeOfSection.LowPart - 1;
            MiInsertBasedSection(NewSection);
        }
        else
        {
            /* FIXME : Should we deny section creation if SEC_BASED is not set ? Can we have two different section objects on the same based address ? Investigate !*/
            ASSERT(FALSE);
        }
 
        KeReleaseGuardedMutex(&MmSectionBasedMutex);
    }
 
    /* The control area is not being created anymore */
    if (ControlArea->u.Flags.BeingCreated == 1)
    {
        /* Acquire the PFN lock while we set control area flags */
        OldIrql = MiAcquirePfnLock();
 
        /* Take off the being created flag, and then release the lock */
        ControlArea->u.Flags.BeingCreated = 0;
        NewSection->u.Flags.BeingCreated = 0;
 
        MiReleasePfnLock(OldIrql);
    }
 
    /* Migrate the attribute into a flag */
    if (AllocationAttributes & SEC_NO_CHANGE) NewSection->u.Flags.NoChange = TRUE;
 
    /* If R/W access is not requested, this might eventually become a CoW mapping */
    if (!(SectionPageProtection & (PAGE_READWRITE | PAGE_EXECUTE_READWRITE)))
    {
        NewSection->u.Flags.CopyOnWrite = TRUE;
    }
 
    /* Write down if this was a kernel call */
    ControlArea->u.Flags.WasPurged |= KernelCall;
    ASSERT(ControlArea->u.Flags.WasPurged == FALSE);
 
    /* Make sure the segment and the section are the same size, or the section is smaller */
    ASSERT((ULONG64)NewSection->SizeOfSection.QuadPart <= NewSection->Segment->SizeOfSegment);
 
    /* Return the object and the creation status */
    *SectionObject = (PVOID)NewSection;
    return Status;
}

Referenced by MmCreateSection().

MmCreateDataFileSection()

static NTSTATUS NTAPI MmCreateDataFileSection ( PSECTION *  SectionObject, ACCESS_MASK  DesiredAccess, POBJECT_ATTRIBUTES  ObjectAttributes, PLARGE_INTEGER  UMaximumSize, ULONG  SectionPageProtection, ULONG  AllocationAttributes, PFILE_OBJECT  FileObject, BOOLEAN  GotFileHandle  )

static

Definition at line 2327 of file section.c.

{
    PSECTION Section;
    NTSTATUS Status;
    LARGE_INTEGER MaximumSize;
    PMM_SECTION_SEGMENT Segment;
    KIRQL OldIrql;
 
    /*
     * Create the section
     */
    Status = ObCreateObject(ExGetPreviousMode(),
                            MmSectionObjectType,
                            ObjectAttributes,
                            ExGetPreviousMode(),
                            NULL,
                            sizeof(*Section),
                            0,
                            0,
                            (PVOID*)&Section);
    if (!NT_SUCCESS(Status))
    {
        return Status;
    }
    /*
     * Initialize it
     */
    RtlZeroMemory(Section, sizeof(*Section));
 
    /* Mark this as a "ROS" section */
    Section->u.Flags.filler = 1;
    Section->InitialPageProtection = SectionPageProtection;
    Section->u.Flags.File = 1;
 
    if (AllocationAttributes & SEC_NO_CHANGE)
        Section->u.Flags.NoChange = 1;
    if (AllocationAttributes & SEC_RESERVE)
        Section->u.Flags.Reserve = 1;
 
    if (!GotFileHandle)
    {
        ASSERT(UMaximumSize != NULL);
        // ASSERT(UMaximumSize->QuadPart != 0);
        MaximumSize = *UMaximumSize;
    }
    else
    {
        LARGE_INTEGER FileSize;
        Status = FsRtlGetFileSize(FileObject, &FileSize);
        if (!NT_SUCCESS(Status))
        {
            ObDereferenceObject(Section);
            return Status;
        }
 
        /*
         * FIXME: Revise this once a locking order for file size changes is
         * decided
         */
        if ((UMaximumSize != NULL) && (UMaximumSize->QuadPart != 0))
        {
            MaximumSize = *UMaximumSize;
        }
        else
        {
            MaximumSize = FileSize;
            /* Mapping zero-sized files isn't allowed. */
            if (MaximumSize.QuadPart == 0)
            {
                ObDereferenceObject(Section);
                return STATUS_MAPPED_FILE_SIZE_ZERO;
            }
        }
 
        if (MaximumSize.QuadPart > FileSize.QuadPart)
        {
            Status = IoSetInformation(FileObject,
                                      FileEndOfFileInformation,
                                      sizeof(LARGE_INTEGER),
                                      &MaximumSize);
            if (!NT_SUCCESS(Status))
            {
                ObDereferenceObject(Section);
                return STATUS_SECTION_NOT_EXTENDED;
            }
        }
    }
 
    if (FileObject->SectionObjectPointer == NULL)
    {
        ObDereferenceObject(Section);
        return STATUS_INVALID_FILE_FOR_SECTION;
    }
 
    /*
     * Lock the file
     */
    Status = MmspWaitForFileLock(FileObject);
    if (Status != STATUS_SUCCESS)
    {
        ObDereferenceObject(Section);
        return Status;
    }
 
    /* Lock the PFN lock while messing with Section Object pointers */
grab_segment:
    OldIrql = MiAcquirePfnLock();
    Segment = FileObject->SectionObjectPointer->DataSectionObject;
 
    while (Segment && (Segment->SegFlags & (MM_SEGMENT_INDELETE | MM_SEGMENT_INCREATE)))
    {
        MiReleasePfnLock(OldIrql);
        KeDelayExecutionThread(KernelMode, FALSE, &TinyTime);
        OldIrql = MiAcquirePfnLock();
        Segment = FileObject->SectionObjectPointer->DataSectionObject;
    }
 
    /*
     * If this file hasn't been mapped as a data file before then allocate a
     * section segment to describe the data file mapping
     */
    if (Segment == NULL)
    {
        /* Release the lock. ExAllocatePoolWithTag might acquire it */
        MiReleasePfnLock(OldIrql);
 
        Segment = ExAllocatePoolWithTag(NonPagedPool, sizeof(MM_SECTION_SEGMENT),
                                        TAG_MM_SECTION_SEGMENT);
        if (Segment == NULL)
        {
            //KeSetEvent((PVOID)&FileObject->Lock, IO_NO_INCREMENT, FALSE);
            ObDereferenceObject(Section);
            return STATUS_NO_MEMORY;
        }
 
        /* We are creating it */
        RtlZeroMemory(Segment, sizeof(*Segment));
        Segment->SegFlags = MM_DATAFILE_SEGMENT | MM_SEGMENT_INCREATE;
        Segment->RefCount = 1;
 
        /* Acquire lock again */
        OldIrql = MiAcquirePfnLock();
 
        if (FileObject->SectionObjectPointer->DataSectionObject != NULL)
        {
            /* Well that's bad luck. Restart it all over */
            MiReleasePfnLock(OldIrql);
            ExFreePoolWithTag(Segment, TAG_MM_SECTION_SEGMENT);
            goto grab_segment;
        }
 
        FileObject->SectionObjectPointer->DataSectionObject = Segment;
 
        /* We're safe to release the lock now */
        MiReleasePfnLock(OldIrql);
 
        Section->Segment = (PSEGMENT)Segment;
 
        /* Self-referencing segment */
        Segment->Flags = &Segment->SegFlags;
        Segment->ReferenceCount = &Segment->RefCount;
 
        Segment->SectionCount = 1;
 
        ExInitializeFastMutex(&Segment->Lock);
        Segment->FileObject = FileObject;
        ObReferenceObject(FileObject);
 
        Segment->Image.FileOffset = 0;
        Segment->Protection = SectionPageProtection;
 
        Segment->Image.Characteristics = 0;
        Segment->WriteCopy = (SectionPageProtection & (PAGE_WRITECOPY | PAGE_EXECUTE_WRITECOPY));
        if (AllocationAttributes & SEC_RESERVE)
        {
            Segment->Length.QuadPart = Segment->RawLength.QuadPart = 0;
        }
        else
        {
            Segment->RawLength.QuadPart = MaximumSize.QuadPart;
            Segment->Length.QuadPart = PAGE_ROUND_UP(Segment->RawLength.QuadPart);
        }
        Segment->Image.VirtualAddress = 0;
        MiInitializeSectionPageTable(Segment);
 
        /* We're good to use it now */
        OldIrql = MiAcquirePfnLock();
        Segment->SegFlags &= ~MM_SEGMENT_INCREATE;
        MiReleasePfnLock(OldIrql);
    }
    else
    {
        Section->Segment = (PSEGMENT)Segment;
        InterlockedIncrement64(&Segment->RefCount);
        InterlockedIncrementUL(&Segment->SectionCount);
 
        MiReleasePfnLock(OldIrql);
 
        MmLockSectionSegment(Segment);
 
        if (MaximumSize.QuadPart > Segment->RawLength.QuadPart &&
                !(AllocationAttributes & SEC_RESERVE))
        {
            Segment->RawLength.QuadPart = MaximumSize.QuadPart;
            Segment->Length.QuadPart = PAGE_ROUND_UP(Segment->RawLength.QuadPart);
        }
 
        MmUnlockSectionSegment(Segment);
    }
    Section->SizeOfSection = MaximumSize;
 
    //KeSetEvent((PVOID)&FileObject->Lock, IO_NO_INCREMENT, FALSE);
    *SectionObject = Section;
    return STATUS_SUCCESS;
}

Referenced by MmCreateSection().

MmCreateImageSection()

NTSTATUS MmCreateImageSection	(	PSECTION *	SectionObject,
		ACCESS_MASK	DesiredAccess,
		POBJECT_ATTRIBUTES	ObjectAttributes,
		PLARGE_INTEGER	UMaximumSize,
		ULONG	SectionPageProtection,
		ULONG	AllocationAttributes,
		PFILE_OBJECT	FileObject
	)

Definition at line 3177 of file section.c.

{
    PSECTION Section;
    NTSTATUS Status;
    PMM_IMAGE_SECTION_OBJECT ImageSectionObject;
    KIRQL OldIrql;
 
 
    if (FileObject == NULL)
        return STATUS_INVALID_FILE_FOR_SECTION;
 
    if (FileObject->SectionObjectPointer == NULL)
    {
        DPRINT1("Denying section creation due to missing cache initialization\n");
        return STATUS_INVALID_FILE_FOR_SECTION;
    }
 
    /*
     * Create the section
     */
    Status = ObCreateObject (ExGetPreviousMode(),
                             MmSectionObjectType,
                             ObjectAttributes,
                             ExGetPreviousMode(),
                             NULL,
                             sizeof(*Section),
                             0,
                             0,
                             (PVOID*)(PVOID)&Section);
    if (!NT_SUCCESS(Status))
    {
        return Status;
    }
 
    /*
     * Initialize it
     */
    RtlZeroMemory(Section, sizeof(*Section));
 
    /* Mark this as a "ROS" Section */
    Section->u.Flags.filler = 1;
 
    Section->InitialPageProtection = SectionPageProtection;
    Section->u.Flags.File = 1;
    Section->u.Flags.Image = 1;
    if (AllocationAttributes & SEC_NO_CHANGE)
        Section->u.Flags.NoChange = 1;
 
grab_image_section_object:
    OldIrql = MiAcquirePfnLock();
 
    /* Wait for it to be properly created or deleted */
    ImageSectionObject = FileObject->SectionObjectPointer->ImageSectionObject;
    while(ImageSectionObject && (ImageSectionObject->SegFlags & (MM_SEGMENT_INDELETE | MM_SEGMENT_INCREATE)))
    {
        MiReleasePfnLock(OldIrql);
 
        KeDelayExecutionThread(KernelMode, FALSE, &TinyTime);
 
        OldIrql = MiAcquirePfnLock();
        ImageSectionObject = FileObject->SectionObjectPointer->ImageSectionObject;
    }
 
    if (ImageSectionObject == NULL)
    {
        NTSTATUS StatusExeFmt;
 
        /* Release the lock because ExAllocatePoolWithTag could need to acquire it */
        MiReleasePfnLock(OldIrql);
 
        ImageSectionObject = ExAllocatePoolZero(NonPagedPool, sizeof(MM_IMAGE_SECTION_OBJECT), TAG_MM_SECTION_SEGMENT);
        if (ImageSectionObject == NULL)
        {
            ObDereferenceObject(Section);
            return STATUS_NO_MEMORY;
        }
 
        ImageSectionObject->SegFlags = MM_SEGMENT_INCREATE;
        ImageSectionObject->RefCount = 1;
        ImageSectionObject->SectionCount = 1;
 
        OldIrql = MiAcquirePfnLock();
        if (FileObject->SectionObjectPointer->ImageSectionObject != NULL)
        {
            MiReleasePfnLock(OldIrql);
            /* Bad luck. Start over */
            ExFreePoolWithTag(ImageSectionObject, TAG_MM_SECTION_SEGMENT);
            goto grab_image_section_object;
        }
 
        FileObject->SectionObjectPointer->ImageSectionObject = ImageSectionObject;
 
        MiReleasePfnLock(OldIrql);
 
        /* Purge the cache */
        CcFlushCache(FileObject->SectionObjectPointer, NULL, 0, NULL);
 
        StatusExeFmt = ExeFmtpCreateImageSection(FileObject, ImageSectionObject);
 
        if (!NT_SUCCESS(StatusExeFmt))
        {
            /* Unset */
            OldIrql = MiAcquirePfnLock();
            FileObject->SectionObjectPointer->ImageSectionObject = NULL;
            MiReleasePfnLock(OldIrql);
 
            if(ImageSectionObject->Segments != NULL)
                ExFreePool(ImageSectionObject->Segments);
 
            /*
             * If image file is empty, then return that the file is invalid for section
             */
            Status = StatusExeFmt;
            if (StatusExeFmt == STATUS_END_OF_FILE)
            {
                Status = STATUS_INVALID_FILE_FOR_SECTION;
            }
 
            ExFreePoolWithTag(ImageSectionObject, TAG_MM_SECTION_SEGMENT);
            ObDereferenceObject(Section);
            return Status;
        }
 
        Section->Segment = (PSEGMENT)ImageSectionObject;
        ASSERT(ImageSectionObject->Segments);
        ASSERT(ImageSectionObject->RefCount > 0);
 
        /*
         * Lock the file
         */
        Status = MmspWaitForFileLock(FileObject);
        if (!NT_SUCCESS(Status))
        {
            /* Unset */
            OldIrql = MiAcquirePfnLock();
            FileObject->SectionObjectPointer->ImageSectionObject = NULL;
            MiReleasePfnLock(OldIrql);
 
            ExFreePool(ImageSectionObject->Segments);
            ExFreePool(ImageSectionObject);
            ObDereferenceObject(Section);
            return Status;
        }
 
        OldIrql = MiAcquirePfnLock();
        ImageSectionObject->SegFlags &= ~MM_SEGMENT_INCREATE;
 
        /* Take a ref on the file on behalf of the newly created structure */
        ObReferenceObject(FileObject);
 
        MiReleasePfnLock(OldIrql);
 
        Status = StatusExeFmt;
    }
    else
    {
        /* If FS driver called for delete, tell them it's not possible anymore. */
        ImageSectionObject->SegFlags &= ~MM_IMAGE_SECTION_FLUSH_DELETE;
 
        /* Take one ref */
        InterlockedIncrement64(&ImageSectionObject->RefCount);
        ImageSectionObject->SectionCount++;
 
        MiReleasePfnLock(OldIrql);
 
        Section->Segment = (PSEGMENT)ImageSectionObject;
 
        Status = STATUS_SUCCESS;
    }
    //KeSetEvent((PVOID)&FileObject->Lock, IO_NO_INCREMENT, FALSE);
    *SectionObject = Section;
    ASSERT(ImageSectionObject->RefCount > 0);
 
    return Status;
}

Referenced by MmCreateSection().

MmCreatePhysicalMemorySection()

NTSTATUS NTAPI MmCreatePhysicalMemorySection

(

VOID

)

Definition at line 2203 of file section.c.

{
    PSECTION PhysSection;
    NTSTATUS Status;
    OBJECT_ATTRIBUTES Obj;
    UNICODE_STRING Name = RTL_CONSTANT_STRING(L"\\Device\\PhysicalMemory");
    LARGE_INTEGER SectionSize;
    HANDLE Handle;
    PMM_SECTION_SEGMENT Segment;
 
    /*
     * Create the section mapping physical memory
     */
    SectionSize.QuadPart = MmHighestPhysicalPage * PAGE_SIZE;
    InitializeObjectAttributes(&Obj,
                               &Name,
                               OBJ_PERMANENT | OBJ_KERNEL_EXCLUSIVE,
                               NULL,
                               NULL);
    /*
     * Create the Object
     */
    Status = ObCreateObject(KernelMode,
                            MmSectionObjectType,
                            &Obj,
                            ExGetPreviousMode(),
                            NULL,
                            sizeof(*PhysSection),
                            0,
                            0,
                            (PVOID*)&PhysSection);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("MmCreatePhysicalMemorySection: failed to create object (0x%lx)\n", Status);
        return Status;
    }
 
    /*
     * Initialize it
     */
    RtlZeroMemory(PhysSection, sizeof(*PhysSection));
 
    /* Mark this as a "ROS Section" */
    PhysSection->u.Flags.filler = 1;
    PhysSection->InitialPageProtection = PAGE_EXECUTE_READWRITE;
    PhysSection->u.Flags.PhysicalMemory = 1;
    PhysSection->SizeOfSection = SectionSize;
    Segment = ExAllocatePoolWithTag(NonPagedPool, sizeof(MM_SECTION_SEGMENT),
                                    TAG_MM_SECTION_SEGMENT);
    if (Segment == NULL)
    {
        ObDereferenceObject(PhysSection);
        return STATUS_NO_MEMORY;
    }
    RtlZeroMemory(Segment, sizeof(MM_SECTION_SEGMENT));
    PhysSection->Segment = (PSEGMENT)Segment;
    Segment->RefCount = 1;
 
    Segment->ReferenceCount = &Segment->RefCount;
    Segment->Flags = &Segment->SegFlags;
 
    ExInitializeFastMutex(&Segment->Lock);
    Segment->Image.FileOffset = 0;
    Segment->Protection = PAGE_EXECUTE_READWRITE;
    Segment->RawLength = SectionSize;
    Segment->Length = SectionSize;
    Segment->SegFlags = MM_PHYSICALMEMORY_SEGMENT;
    Segment->WriteCopy = FALSE;
    Segment->Image.VirtualAddress = 0;
    Segment->Image.Characteristics = 0;
    MiInitializeSectionPageTable(Segment);
 
    Status = ObInsertObject(PhysSection,
                            NULL,
                            SECTION_ALL_ACCESS,
                            0,
                            NULL,
                            &Handle);
    if (!NT_SUCCESS(Status))
    {
        ObDereferenceObject(PhysSection);
        return Status;
    }
    ObCloseHandle(Handle, KernelMode);
 
    return STATUS_SUCCESS;
}

Referenced by MmInitSectionImplementation().

MmCreateSection()

NTSTATUS NTAPI MmCreateSection	(	OUT PVOID *	Section,
		IN ACCESS_MASK	DesiredAccess,
		IN POBJECT_ATTRIBUTES ObjectAttributes	OPTIONAL,
		IN PLARGE_INTEGER	MaximumSize,
		IN ULONG	SectionPageProtection,
		IN ULONG	AllocationAttributes,
		IN HANDLE FileHandle	OPTIONAL,
		IN PFILE_OBJECT FileObject	OPTIONAL
	)

Definition at line 4620 of file section.c.

{
    NTSTATUS Status;
    ULONG Protection;
    PSECTION *SectionObject = (PSECTION *)Section;
    BOOLEAN FileLock = FALSE;
 
    /* Check if an ARM3 section is being created instead */
    if (!(AllocationAttributes & (SEC_IMAGE | SEC_PHYSICALMEMORY)))
    {
        if (!(FileObject) && !(FileHandle))
        {
            return MmCreateArm3Section(Section,
                                       DesiredAccess,
                                       ObjectAttributes,
                                       MaximumSize,
                                       SectionPageProtection,
                                       AllocationAttributes &~ 1,
                                       FileHandle,
                                       FileObject);
        }
    }
 
    /* Convert section flag to page flag */
    if (AllocationAttributes & SEC_NOCACHE) SectionPageProtection |= PAGE_NOCACHE;
 
    /* Check to make sure the protection is correct. Nt* does this already */
    Protection = MiMakeProtectionMask(SectionPageProtection);
    if (Protection == MM_INVALID_PROTECTION)
    {
        DPRINT1("Page protection is invalid\n");
        return STATUS_INVALID_PAGE_PROTECTION;
    }
 
    /* Check if this is going to be a data or image backed file section */
    if ((FileHandle) || (FileObject))
    {
        /* These cannot be mapped with large pages */
        if (AllocationAttributes & SEC_LARGE_PAGES)
        {
            DPRINT1("Large pages cannot be used with an image mapping\n");
            return STATUS_INVALID_PARAMETER_6;
        }
 
        /* Did the caller pass a file object ? */
        if (FileObject)
        {
            /* Reference the object directly */
            ObReferenceObject(FileObject);
 
            /* We don't create image mappings with file objects */
            AllocationAttributes &= ~SEC_IMAGE;
        }
        else
        {
            /* Reference the file handle to get the object */
            Status = ObReferenceObjectByHandle(FileHandle,
                                               MmMakeFileAccess[Protection],
                                               IoFileObjectType,
                                               ExGetPreviousMode(),
                                               (PVOID*)&FileObject,
                                               NULL);
            if (!NT_SUCCESS(Status))
            {
                DPRINT1("Failed to get a handle to the FO: %lx\n", Status);
                return Status;
            }
 
            /* Lock the file */
            Status = FsRtlAcquireToCreateMappedSection(FileObject, SectionPageProtection);
            if (!NT_SUCCESS(Status))
            {
                ObDereferenceObject(FileObject);
                return Status;
            }
 
            FileLock = TRUE;
 
            /* Deny access if there are writes on the file */
#if 0
            if ((AllocationAttributes & SEC_IMAGE) && (Status == STATUS_FILE_LOCKED_WITH_WRITERS))
            {
                DPRINT1("Cannot create image maps with writers open on the file!\n");
                Status = STATUS_ACCESS_DENIED;
                goto Quit;
            }
#else
            if ((AllocationAttributes & SEC_IMAGE) && (Status == STATUS_FILE_LOCKED_WITH_WRITERS))
                DPRINT1("Creating image map with writers open on the file!\n");
#endif
        }
    }
    else
    {
        /* A handle must be supplied with SEC_IMAGE, as this is the no-handle path */
        if (AllocationAttributes & SEC_IMAGE) return STATUS_INVALID_FILE_FOR_SECTION;
    }
 
    if (AllocationAttributes & SEC_IMAGE)
    {
        Status = MmCreateImageSection(SectionObject,
                                      DesiredAccess,
                                      ObjectAttributes,
                                      MaximumSize,
                                      SectionPageProtection,
                                      AllocationAttributes,
                                      FileObject);
    }
#ifndef NEWCC
    else if (FileObject != NULL)
    {
        Status =  MmCreateDataFileSection(SectionObject,
                                          DesiredAccess,
                                          ObjectAttributes,
                                          MaximumSize,
                                          SectionPageProtection,
                                          AllocationAttributes,
                                          FileObject,
                                          FileHandle != NULL);
    }
#else
    else if (FileHandle != NULL || FileObject != NULL)
    {
        Status = MmCreateCacheSection(SectionObject,
                                      DesiredAccess,
                                      ObjectAttributes,
                                      MaximumSize,
                                      SectionPageProtection,
                                      AllocationAttributes,
                                      FileObject);
    }
#endif
    else
    {
        /* All cases should be handled above */
        Status = STATUS_INVALID_PARAMETER;
    }
 
    if (FileLock)
        FsRtlReleaseFile(FileObject);
    if (FileObject)
        ObDereferenceObject(FileObject);
 
    return Status;
}

Referenced by CcpAllocateSection(), CcRosInitializeFileCache(), EngCreateSection(), EngCreateSectionHack(), EngLoadModuleEx(), InitGdiHandleTable(), IntGdiAddFontResourceEx(), NtCreateSection(), TestCreateSection(), TestPhysicalMemorySection(), and UserCreateHeap().

MmExtendSection()

NTSTATUS NTAPI MmExtendSection	(	_In_ PVOID	_Section,
		_Inout_ PLARGE_INTEGER	NewSize
	)

Definition at line 5273 of file section.c.

{
    PSECTION Section = _Section;
 
    /* It makes no sense to extend an image mapping */
    if (Section->u.Flags.Image)
        return STATUS_SECTION_NOT_EXTENDED;
 
    /* Nor is it possible to extend a page file mapping */
    if (!Section->u.Flags.File)
        return STATUS_SECTION_NOT_EXTENDED;
 
    if (!MiIsRosSectionObject(Section))
        return STATUS_NOT_IMPLEMENTED;
 
    /* We just extend the sizes. Shrinking is a no-op ? */
    if (NewSize->QuadPart > Section->SizeOfSection.QuadPart)
    {
        PMM_SECTION_SEGMENT Segment = (PMM_SECTION_SEGMENT)Section->Segment;
        Section->SizeOfSection = *NewSize;
 
        if (!Section->u.Flags.Reserve)
        {
            MmLockSectionSegment(Segment);
            if (Segment->RawLength.QuadPart < NewSize->QuadPart)
            {
                Segment->RawLength = *NewSize;
                Segment->Length.QuadPart = (NewSize->QuadPart + PAGE_SIZE - 1) & ~((LONGLONG)PAGE_SIZE);
            }
            MmUnlockSectionSegment(Segment);
        }
    }
 
    return STATUS_SUCCESS;
}

Referenced by CcSetFileSizes(), and NtExtendSection().

MmFlushImageSection()

BOOLEAN NTAPI MmFlushImageSection	(	IN PSECTION_OBJECT_POINTERS	SectionObjectPointer,
		IN MMFLUSH_TYPE	FlushType
	)

Definition at line 4356 of file section.c.

{
    switch(FlushType)
    {
        case MmFlushForDelete:
        {
            /*
             * FIXME: Check for outstanding write probes on Data section.
             * How do we do that ?
             */
        }
        /* Fall-through */
        case MmFlushForWrite:
        {
            KIRQL OldIrql = MiAcquirePfnLock();
            PMM_IMAGE_SECTION_OBJECT ImageSectionObject = SectionObjectPointer->ImageSectionObject;
 
            DPRINT("Deleting or modifying %p\n", SectionObjectPointer);
 
            /* Wait for concurrent creation or deletion of image to be done */
            ImageSectionObject = SectionObjectPointer->ImageSectionObject;
            while (ImageSectionObject && (ImageSectionObject->SegFlags & (MM_SEGMENT_INCREATE | MM_SEGMENT_INDELETE)))
            {
                MiReleasePfnLock(OldIrql);
                KeDelayExecutionThread(KernelMode, FALSE, &TinyTime);
                OldIrql = MiAcquirePfnLock();
                ImageSectionObject = SectionObjectPointer->ImageSectionObject;
            }
 
            if (!ImageSectionObject)
            {
                DPRINT("No image section object. Accepting\n");
                /* Nothing to do */
                MiReleasePfnLock(OldIrql);
                return TRUE;
            }
 
            /* Do we have open sections or mappings on it ? */
            if ((ImageSectionObject->SectionCount) || (ImageSectionObject->MapCount))
            {
                /* We do. No way to delete it */
                MiReleasePfnLock(OldIrql);
                DPRINT("Denying. There are mappings open\n");
                return FALSE;
            }
 
            /* There are no sections open on it, but we must still have pages around. Discard everything */
            ImageSectionObject->SegFlags |= MM_IMAGE_SECTION_FLUSH_DELETE;
            InterlockedIncrement64(&ImageSectionObject->RefCount);
            MiReleasePfnLock(OldIrql);
 
            DPRINT("Purging\n");
 
            for (ULONG i = 0; i < ImageSectionObject->NrSegments; i++)
            {
                if (!MiPurgeImageSegment(&ImageSectionObject->Segments[i]))
                    break;
            }
 
            /* Grab lock again */
            OldIrql = MiAcquirePfnLock();
 
            if (!(ImageSectionObject->SegFlags & MM_IMAGE_SECTION_FLUSH_DELETE))
            {
                /*
                 * Someone actually created a section while we were not looking.
                 * Drop our ref and deny.
                 * MmDereferenceSegmentWithLock releases Pfn lock
                 */
                MmDereferenceSegmentWithLock(&ImageSectionObject->Segments[0], OldIrql);
                return FALSE;
            }
 
            /* We should be the last one holding a ref here. */
            ASSERT(ImageSectionObject->RefCount == 1);
            ASSERT(ImageSectionObject->SectionCount == 0);
 
            /* Dereference the first segment, this will free everything & release the lock */
            MmDereferenceSegmentWithLock(&ImageSectionObject->Segments[0], OldIrql);
            return TRUE;
        }
    }
    return FALSE;
}

Referenced by _Requires_lock_held_(), Ext2CreateFile(), Ext2IsFileRemovable(), Ext2PurgeFile(), Ext2PurgeVolume(), FatSetRenameInfo(), open_file3(), RxCommonSetInformation(), RxPurgeFcbInSystemCache(), RxPurgeFobx(), RxPurgeNetFcb(), set_disposition_information(), UDFCloseAllXXXDelayedInDir(), UDFCommonCreate(), UDFMarkStreamsForDeletion(), UDFSetDispositionInformation(), VfatCreateFile(), vfatPrepareTargetForRename(), and VfatSetDispositionInformation().

MmFlushSegment()

NTSTATUS NTAPI MmFlushSegment	(	_In_ PSECTION_OBJECT_POINTERS	SectionObjectPointer,
		_In_opt_ PLARGE_INTEGER	Offset,
		_In_ ULONG	Length,
		_Out_opt_ PIO_STATUS_BLOCK	Iosb
	)

Definition at line 4940 of file section.c.

{
    LARGE_INTEGER FlushStart, FlushEnd;
    NTSTATUS Status;
 
    if (Offset)
    {
        FlushStart = *Offset;
        Status = RtlLongLongAdd(FlushStart.QuadPart, Length, &FlushEnd.QuadPart);
        if (!NT_SUCCESS(Status))
            return Status;
    }
 
    if (Iosb)
        Iosb->Information = 0;
 
    PMM_SECTION_SEGMENT Segment = MiGrabDataSection(SectionObjectPointer);
    if (!Segment)
    {
        /* Nothing to flush */
        if (Iosb)
            Iosb->Status = STATUS_SUCCESS;
        return STATUS_SUCCESS;
    }
 
    ASSERT(*Segment->Flags & MM_DATAFILE_SEGMENT);
 
    MmLockSectionSegment(Segment);
 
    if (!Offset)
    {
        FlushStart.QuadPart = 0;
 
        /* FIXME: All of this is suboptimal */
        ULONG ElemCount = RtlNumberGenericTableElements(&Segment->PageTable);
        /* No page. Nothing to flush */
        if (!ElemCount)
        {
            MmUnlockSectionSegment(Segment);
            MmDereferenceSegment(Segment);
            if (Iosb)
            {
                Iosb->Status = STATUS_SUCCESS;
                Iosb->Information = 0;
            }
            return STATUS_SUCCESS;
        }
 
        PCACHE_SECTION_PAGE_TABLE PageTable = RtlGetElementGenericTable(&Segment->PageTable, ElemCount - 1);
        FlushEnd.QuadPart = PageTable->FileOffset.QuadPart + _countof(PageTable->PageEntries) * PAGE_SIZE;
    }
 
    FlushStart.QuadPart >>= PAGE_SHIFT;
    FlushStart.QuadPart <<= PAGE_SHIFT;
 
    while (FlushStart.QuadPart < FlushEnd.QuadPart)
    {
        ULONG_PTR Entry = MmGetPageEntrySectionSegment(Segment, &FlushStart);
 
        if (IS_DIRTY_SSE(Entry))
        {
            MmCheckDirtySegment(Segment, &FlushStart, FALSE, FALSE);
 
            if (Iosb)
                Iosb->Information += PAGE_SIZE;
        }
 
        FlushStart.QuadPart += PAGE_SIZE;
    }
 
    MmUnlockSectionSegment(Segment);
    MmDereferenceSegment(Segment);
 
    if (Iosb)
        Iosb->Status = STATUS_SUCCESS;
 
    return STATUS_SUCCESS;
}

Referenced by CcFlushCache(), CcRosDeleteFileCache(), CcRosFlushVacb(), and MiRosUnmapViewOfSection().

MmFreeSectionPage()

static VOID MmFreeSectionPage ( PVOID  Context, MEMORY_AREA *  MemoryArea, PVOID  Address, PFN_NUMBER  Page, SWAPENTRY  SwapEntry, BOOLEAN  Dirty  )

static

Definition at line 3441 of file section.c.

{
    ULONG_PTR Entry;
    LARGE_INTEGER Offset;
    SWAPENTRY SavedSwapEntry;
    PMM_SECTION_SEGMENT Segment;
    PMMSUPPORT AddressSpace;
    PEPROCESS Process;
 
    AddressSpace = (PMMSUPPORT)Context;
    Process = MmGetAddressSpaceOwner(AddressSpace);
 
    Address = (PVOID)PAGE_ROUND_DOWN(Address);
 
    Offset.QuadPart = ((ULONG_PTR)Address - MA_GetStartingAddress(MemoryArea)) +
                      MemoryArea->SectionData.ViewOffset;
 
    Segment = MemoryArea->SectionData.Segment;
 
    Entry = MmGetPageEntrySectionSegment(Segment, &Offset);
    while (Entry && MM_IS_WAIT_PTE(Entry))
    {
        MmUnlockSectionSegment(Segment);
        MmUnlockAddressSpace(AddressSpace);
 
        KeDelayExecutionThread(KernelMode, FALSE, &TinyTime);
 
        MmLockAddressSpace(AddressSpace);
        MmLockSectionSegment(Segment);
        Entry = MmGetPageEntrySectionSegment(Segment, &Offset);
    }
 
    /*
     * For a dirty, datafile, non-private page, there shoulkd be no swap entry
     */
    if (*Segment->Flags & MM_DATAFILE_SEGMENT)
    {
        if (Page == PFN_FROM_SSE(Entry) && Dirty)
        {
            ASSERT(SwapEntry == 0);
        }
    }
 
    if (SwapEntry != 0)
    {
        /*
         * Sanity check
         */
        MmFreeSwapPage(SwapEntry);
    }
    else if (Page != 0)
    {
        if (IS_SWAP_FROM_SSE(Entry) ||
                Page != PFN_FROM_SSE(Entry))
        {
            ASSERT(Process != NULL);
 
            /*
             * Just dereference private pages
             */
            SavedSwapEntry = MmGetSavedSwapEntryPage(Page);
            if (SavedSwapEntry != 0)
            {
                MmFreeSwapPage(SavedSwapEntry);
                MmSetSavedSwapEntryPage(Page, 0);
            }
            MmDeleteRmap(Page, Process, Address);
            MmReleasePageMemoryConsumer(MC_USER, Page);
        }
        else
        {
            if (Process)
            {
                MmDeleteRmap(Page, Process, Address);
            }
 
            /* We don't dirtify for System Space Maps. We let Cc manage that */
            MmUnsharePageEntrySectionSegment(MemoryArea, Segment, &Offset, Process ? Dirty : FALSE, FALSE, NULL);
        }
    }
}

Referenced by MmUnmapViewOfSegment().

MmInitSectionImplementation()

NTSTATUS NTAPI MmInitSectionImplementation

(

VOID

)

Definition at line 2294 of file section.c.

{
    OBJECT_TYPE_INITIALIZER ObjectTypeInitializer;
    UNICODE_STRING Name;
 
    DPRINT("Creating Section Object Type\n");
 
    /* Initialize the section based root */
    ASSERT(MmSectionBasedRoot.NumberGenericTableElements == 0);
    MmSectionBasedRoot.BalancedRoot.u1.Parent = &MmSectionBasedRoot.BalancedRoot;
 
    /* Initialize the Section object type  */
    RtlZeroMemory(&ObjectTypeInitializer, sizeof(ObjectTypeInitializer));
    RtlInitUnicodeString(&Name, L"Section");
    ObjectTypeInitializer.Length = sizeof(ObjectTypeInitializer);
    ObjectTypeInitializer.DefaultPagedPoolCharge = sizeof(SECTION);
    ObjectTypeInitializer.PoolType = PagedPool;
    ObjectTypeInitializer.UseDefaultObject = TRUE;
    ObjectTypeInitializer.GenericMapping = MmpSectionMapping;
    ObjectTypeInitializer.DeleteProcedure = MmpDeleteSection;
    ObjectTypeInitializer.CloseProcedure = MmpCloseSection;
    ObjectTypeInitializer.ValidAccessMask = SECTION_ALL_ACCESS;
    ObjectTypeInitializer.InvalidAttributes = OBJ_OPENLINK;
    ObCreateObjectType(&Name, &ObjectTypeInitializer, NULL, &MmSectionObjectType);
 
    MmCreatePhysicalMemorySection();
 
    return STATUS_SUCCESS;
}

Referenced by MmInitSystem().

MmMakeDataSectionResident()

NTSTATUS NTAPI MmMakeDataSectionResident	(	_In_ PSECTION_OBJECT_POINTERS	SectionObjectPointer,
		_In_ LONGLONG	Offset,
		_In_ ULONG	Length,
		_In_ PLARGE_INTEGER	ValidDataLength
	)

Definition at line 4920 of file section.c.

{
    PMM_SECTION_SEGMENT Segment = MiGrabDataSection(SectionObjectPointer);
 
    /* There must be a segment for this call */
    ASSERT(Segment);
 
    NTSTATUS Status = MmMakeSegmentResident(Segment, Offset, Length, ValidDataLength, FALSE);
 
    MmDereferenceSegment(Segment);
 
    return Status;
}

Referenced by CcRosEnsureVacbResident().

MmMakePagesDirty()

NTSTATUS NTAPI MmMakePagesDirty	(	_In_ PEPROCESS	Process,
		_In_ PVOID	Address,
		_In_ ULONG	Length
	)

Definition at line 5202 of file section.c.

{
    PMEMORY_AREA MemoryArea;
    PMM_SECTION_SEGMENT Segment;
    LARGE_INTEGER SegmentOffset, RangeEnd;
    PMMSUPPORT AddressSpace = Process ? &Process->Vm : MmGetKernelAddressSpace();
 
    MmLockAddressSpace(AddressSpace);
 
    MemoryArea = MmLocateMemoryAreaByAddress(AddressSpace, Address);
    if (MemoryArea == NULL)
    {
        DPRINT1("Unable to find memory area at address %p.\n", Address);
        MmUnlockAddressSpace(AddressSpace);
        return STATUS_NOT_MAPPED_VIEW;
    }
 
    /* Only supported in old Mm for now */
    ASSERT(MemoryArea->Type == MEMORY_AREA_SECTION_VIEW);
    /* For file mappings */
    ASSERT(MemoryArea->VadNode.u.VadFlags.VadType != VadImageMap);
 
    Segment = MemoryArea->SectionData.Segment;
    MmLockSectionSegment(Segment);
 
    SegmentOffset.QuadPart = PAGE_ROUND_DOWN(Address) - MA_GetStartingAddress(MemoryArea)
            + MemoryArea->SectionData.ViewOffset;
    RangeEnd.QuadPart = PAGE_ROUND_UP((ULONG_PTR)Address + Length) - MA_GetStartingAddress(MemoryArea)
            + MemoryArea->SectionData.ViewOffset;
 
    DPRINT("MmMakePagesResident: Segment %p, 0x%I64x -> 0x%I64x\n", Segment, SegmentOffset.QuadPart, RangeEnd.QuadPart);
 
    while (SegmentOffset.QuadPart < RangeEnd.QuadPart)
    {
        ULONG_PTR Entry = MmGetPageEntrySectionSegment(Segment, &SegmentOffset);
 
        /* Let any pending read proceed */
        while (MM_IS_WAIT_PTE(Entry))
        {
            MmUnlockSectionSegment(Segment);
            MmUnlockAddressSpace(AddressSpace);
            KeDelayExecutionThread(KernelMode, FALSE, &TinyTime);
            MmLockAddressSpace(AddressSpace);
            MmLockSectionSegment(Segment);
            Entry = MmGetPageEntrySectionSegment(Segment, &SegmentOffset);
        }
 
        /* We are called from Cc, this can't be backed by the page files */
        ASSERT(!IS_SWAP_FROM_SSE(Entry));
 
        /* If there is no page there, there is nothing to make dirty */
        if (Entry != 0)
        {
            /* Dirtify the entry */
            MmSetPageEntrySectionSegment(Segment, &SegmentOffset, DIRTY_SSE(Entry));
        }
 
        SegmentOffset.QuadPart += PAGE_SIZE;
    }
 
    MmUnlockSectionSegment(Segment);
 
    MmUnlockAddressSpace(AddressSpace);
    return STATUS_SUCCESS;
}

Referenced by CcCopyWrite(), CcSetDirtyPinnedData(), and CcZeroData().

MmMakeSegmentResident()

static NTSTATUS NTAPI MmMakeSegmentResident ( _In_ PMM_SECTION_SEGMENT  Segment, _In_ LONGLONG  Offset, _In_ ULONG  Length, _In_opt_ PLARGE_INTEGER  ValidDataLength, _In_ BOOLEAN  SetDirty  )

static

Definition at line 1192 of file section.c.

{
    /* Let's use a 64K granularity. */
    LONGLONG RangeStart, RangeEnd;
    NTSTATUS Status;
    PFILE_OBJECT FileObject = Segment->FileObject;
 
    /* Calculate our range, aligned on 64K if possible. */
    Status = RtlLongLongAdd(Offset, Length, &RangeEnd);
    ASSERT(NT_SUCCESS(Status));
    if (!NT_SUCCESS(Status))
        return Status;
 
    /* If the file is not random access and we are not the page out thread
     * read a 64K Chunk. */
    if (((ULONG_PTR)IoGetTopLevelIrp() != FSRTL_MOD_WRITE_TOP_LEVEL_IRP)
        && !FlagOn(FileObject->Flags, FO_RANDOM_ACCESS))
    {
        RangeStart = Offset - (Offset % _64K);
        if (RangeEnd % _64K)
            RangeEnd += _64K - (RangeEnd % _64K);
    }
    else
    {
        RangeStart = Offset  - (Offset % PAGE_SIZE);
        if (RangeEnd % PAGE_SIZE)
            RangeEnd += PAGE_SIZE - (RangeEnd % PAGE_SIZE);
    }
 
    /* Clamp if needed */
    if (!FlagOn(*Segment->Flags, MM_DATAFILE_SEGMENT))
    {
        if (RangeEnd > Segment->RawLength.QuadPart)
            RangeEnd = Segment->RawLength.QuadPart;
    }
 
    /* Let's gooooooooo */
    for ( ; RangeStart < RangeEnd; RangeStart += _64K)
    {
        /* First take a look at where we miss pages */
        ULONG ToReadPageBits = 0;
        LONGLONG ChunkEnd = RangeStart + _64K;
 
        if (ChunkEnd > RangeEnd)
            ChunkEnd = RangeEnd;
 
        MmLockSectionSegment(Segment);
        for (LONGLONG ChunkOffset = RangeStart; ChunkOffset < ChunkEnd; ChunkOffset += PAGE_SIZE)
        {
            LARGE_INTEGER CurrentOffset;
 
            CurrentOffset.QuadPart = ChunkOffset;
            ULONG_PTR Entry = MmGetPageEntrySectionSegment(Segment, &CurrentOffset);
 
            /* Let any pending read proceed */
            while (MM_IS_WAIT_PTE(Entry))
            {
                MmUnlockSectionSegment(Segment);
 
                KeDelayExecutionThread(KernelMode, FALSE, &TinyTime);
 
                MmLockSectionSegment(Segment);
                Entry = MmGetPageEntrySectionSegment(Segment, &CurrentOffset);
            }
 
            if (Entry != 0)
            {
                /* Dirtify it if it's a resident page and we're asked to */
                if (SetDirty && !IS_SWAP_FROM_SSE(Entry))
                    MmSetPageEntrySectionSegment(Segment, &CurrentOffset, DIRTY_SSE(Entry));
                continue;
            }
 
            ToReadPageBits |= 1UL << ((ChunkOffset - RangeStart) >> PAGE_SHIFT);
 
            /* Put a wait entry here */
            MmSetPageEntrySectionSegment(Segment, &CurrentOffset, MAKE_SWAP_SSE(MM_WAIT_ENTRY));
        }
        MmUnlockSectionSegment(Segment);
 
        if (ToReadPageBits == 0)
        {
            /* Nothing to do for this chunk */
            continue;
        }
 
        /* Now perform the actual read */
        LONGLONG ChunkOffset = RangeStart;
        while (ChunkOffset < ChunkEnd)
        {
            /* Move forward if there is a hole */
            ULONG BitSet;
            if (!_BitScanForward(&BitSet, ToReadPageBits))
            {
                /* Nothing more to read */
                break;
            }
            ToReadPageBits >>= BitSet;
            ChunkOffset += BitSet * PAGE_SIZE;
            ASSERT(ChunkOffset < ChunkEnd);
 
            /* Get the range we have to read */
            _BitScanForward(&BitSet, ~ToReadPageBits);
            ULONG ReadLength = BitSet * PAGE_SIZE;
 
            ASSERT(ReadLength <= _64K);
 
            /* Clamp (This is for image mappings */
            if ((ChunkOffset + ReadLength) > ChunkEnd)
                ReadLength = ChunkEnd - ChunkOffset;
 
            ASSERT(ReadLength != 0);
 
            /* Allocate a MDL */
            PMDL Mdl = IoAllocateMdl(NULL, ReadLength, FALSE, FALSE, NULL);
            if (!Mdl)
            {
                /* Damn. Roll-back. */
                MmLockSectionSegment(Segment);
                while (ChunkOffset < ChunkEnd)
                {
                    if (ToReadPageBits & 1)
                    {
                        LARGE_INTEGER CurrentOffset;
                        CurrentOffset.QuadPart = ChunkOffset;
                        ASSERT(MM_IS_WAIT_PTE(MmGetPageEntrySectionSegment(Segment, &CurrentOffset)));
                        MmSetPageEntrySectionSegment(Segment, &CurrentOffset, 0);
                    }
                    ToReadPageBits >>= 1;
                    ChunkOffset += PAGE_SIZE;
                }
                MmUnlockSectionSegment(Segment);
                return STATUS_INSUFFICIENT_RESOURCES;
            }
 
            /* Get our pages */
            PPFN_NUMBER Pages = MmGetMdlPfnArray(Mdl);
            RtlZeroMemory(Pages, BYTES_TO_PAGES(ReadLength) * sizeof(PFN_NUMBER));
            for (UINT i = 0; i < BYTES_TO_PAGES(ReadLength); i++)
            {
                Status = MmRequestPageMemoryConsumer(MC_USER, FALSE, &Pages[i]);
                if (!NT_SUCCESS(Status))
                {
                    /* Damn. Roll-back. */
                    for (UINT j = 0; j < i; j++)
                        MmReleasePageMemoryConsumer(MC_USER, Pages[j]);
                    goto Failed;
                }
            }
 
            Mdl->MdlFlags |= MDL_PAGES_LOCKED | MDL_IO_PAGE_READ;
 
            LARGE_INTEGER FileOffset;
            FileOffset.QuadPart = Segment->Image.FileOffset + ChunkOffset;
 
            /* Clamp to VDL */
            if (ValidDataLength && ((FileOffset.QuadPart + ReadLength) > ValidDataLength->QuadPart))
            {
                if (FileOffset.QuadPart > ValidDataLength->QuadPart)
                {
                    /* Great, nothing to read. */
                    goto AssignPagesToSegment;
                }
 
                Mdl->Size = (FileOffset.QuadPart + ReadLength) - ValidDataLength->QuadPart;
            }
 
            KEVENT Event;
            KeInitializeEvent(&Event, NotificationEvent, FALSE);
 
            /* Disable APCs */
            KIRQL OldIrql;
            KeRaiseIrql(APC_LEVEL, &OldIrql);
 
            IO_STATUS_BLOCK Iosb;
            Status = IoPageRead(FileObject, Mdl, &FileOffset, &Event, &Iosb);
            if (Status == STATUS_PENDING)
            {
                KeWaitForSingleObject(&Event, WrPageIn, KernelMode, FALSE, NULL);
                Status = Iosb.Status;
            }
 
            if (Mdl->MdlFlags & MDL_MAPPED_TO_SYSTEM_VA)
            {
                MmUnmapLockedPages(Mdl->MappedSystemVa, Mdl);
            }
 
            KeLowerIrql(OldIrql);
 
            if (Status == STATUS_END_OF_FILE)
            {
                DPRINT1("Got STATUS_END_OF_FILE at offset %I64d for file %wZ.\n", FileOffset.QuadPart, &FileObject->FileName);
                Status = STATUS_SUCCESS;
            }
 
            if (!NT_SUCCESS(Status))
            {
                /* Damn. Roll back. */
                for (UINT i = 0; i < BYTES_TO_PAGES(ReadLength); i++)
                    MmReleasePageMemoryConsumer(MC_USER, Pages[i]);
 
Failed:
                MmLockSectionSegment(Segment);
                while (ChunkOffset < ChunkEnd)
                {
                    if (ToReadPageBits & 1)
                    {
                        LARGE_INTEGER CurrentOffset;
                        CurrentOffset.QuadPart = ChunkOffset;
                        ASSERT(MM_IS_WAIT_PTE(MmGetPageEntrySectionSegment(Segment, &CurrentOffset)));
                        MmSetPageEntrySectionSegment(Segment, &CurrentOffset, 0);
                    }
                    ToReadPageBits >>= 1;
                    ChunkOffset += PAGE_SIZE;
                }
                MmUnlockSectionSegment(Segment);
                IoFreeMdl(Mdl);;
                return Status;
            }
 
AssignPagesToSegment:
            MmLockSectionSegment(Segment);
 
            for (UINT i = 0; i < BYTES_TO_PAGES(ReadLength); i++)
            {
                ULONG_PTR Entry = MAKE_SSE(Pages[i] << PAGE_SHIFT, 0);
                LARGE_INTEGER CurrentOffset;
                CurrentOffset.QuadPart = ChunkOffset + (i * PAGE_SIZE);
 
                ASSERT(MM_IS_WAIT_PTE(MmGetPageEntrySectionSegment(Segment, &CurrentOffset)));
 
                if (SetDirty)
                    Entry = DIRTY_SSE(Entry);
 
                MmSetPageEntrySectionSegment(Segment, &CurrentOffset, Entry);
            }
 
            MmUnlockSectionSegment(Segment);
 
            IoFreeMdl(Mdl);
            ToReadPageBits >>= BitSet;
            ChunkOffset += BitSet * PAGE_SIZE;
        }
    }
 
    return STATUS_SUCCESS;
}

Referenced by MmMakeDataSectionResident(), and MmNotPresentFaultSectionView().

MmMapViewInSystemSpace()

NTSTATUS NTAPI MmMapViewInSystemSpace	(	IN PVOID	SectionObject,
		OUT PVOID *	MappedBase,
		IN OUT PSIZE_T	ViewSize
	)

Definition at line 4447 of file section.c.

{
    LARGE_INTEGER SectionOffset;
 
    SectionOffset.QuadPart = 0;
 
    return MmMapViewInSystemSpaceEx(SectionObject, MappedBase, ViewSize, &SectionOffset, 0);
}

Referenced by ExpInitNls(), IntGdiAddFontResourceEx(), and MmMapViewInSessionSpace().

MmMapViewInSystemSpaceEx()

NTSTATUS NTAPI MmMapViewInSystemSpaceEx	(	_In_ PVOID	SectionObject,
		_Outptr_result_bytebuffer_ *ViewSize PVOID *	MappedBase,
		_Inout_ PSIZE_T	ViewSize,
		_Inout_ PLARGE_INTEGER	SectionOffset,
		_In_ ULONG_PTR	Flags
	)

Definition at line 4460 of file section.c.

{
    PSECTION Section = SectionObject;
    PMM_SECTION_SEGMENT Segment;
    PMMSUPPORT AddressSpace;
    NTSTATUS Status;
 
    UNREFERENCED_PARAMETER(Flags);
 
    PAGED_CODE();
 
    if (MiIsRosSectionObject(SectionObject) == FALSE)
    {
        return MiMapViewInSystemSpace(SectionObject,
                                      &MmSession,
                                      MappedBase,
                                      ViewSize,
                                      SectionOffset);
    }
 
    DPRINT("MmMapViewInSystemSpaceEx() called\n");
 
    /* unsupported for now */
    ASSERT(Section->u.Flags.Image == 0);
 
    Section = SectionObject;
    Segment = (PMM_SECTION_SEGMENT)Section->Segment;
 
    if (*ViewSize == 0)
    {
        LONGLONG MapSizeLL;
 
        /* Page-align the mapping */
        SectionOffset->LowPart = PAGE_ROUND_DOWN(SectionOffset->LowPart);
 
        if (!NT_SUCCESS(RtlLongLongSub(Section->SizeOfSection.QuadPart, SectionOffset->QuadPart, &MapSizeLL)))
            return STATUS_INVALID_VIEW_SIZE;
 
        if (!NT_SUCCESS(RtlLongLongToSIZET(MapSizeLL, ViewSize)))
            return STATUS_INVALID_VIEW_SIZE;
    }
    else
    {
        LONGLONG HelperLL;
 
        /* Get the map end */
        if (!NT_SUCCESS(RtlLongLongAdd(SectionOffset->QuadPart, *ViewSize, &HelperLL)))
            return STATUS_INVALID_VIEW_SIZE;
 
        /* Round it up, if needed */
        if (HelperLL % PAGE_SIZE)
        {
            if (!NT_SUCCESS(RtlLongLongAdd(HelperLL, PAGE_SIZE - (HelperLL % PAGE_SIZE), &HelperLL)))
                return STATUS_INVALID_VIEW_SIZE;
        }
 
        /* Now that we have the mapping end, we can align down its start */
        SectionOffset->LowPart = PAGE_ROUND_DOWN(SectionOffset->LowPart);
 
        /* Get the new size */
        if (!NT_SUCCESS(RtlLongLongSub(HelperLL, SectionOffset->QuadPart, &HelperLL)))
            return STATUS_INVALID_VIEW_SIZE;
 
        if (!NT_SUCCESS(RtlLongLongToSIZET(HelperLL, ViewSize)))
            return STATUS_INVALID_VIEW_SIZE;
    }
 
    AddressSpace = MmGetKernelAddressSpace();
 
    MmLockAddressSpace(AddressSpace);
 
    MmLockSectionSegment(Segment);
 
    Status = MmMapViewOfSegment(AddressSpace,
                                Section->u.Flags.Image,
                                Segment,
                                MappedBase,
                                *ViewSize,
                                PAGE_READWRITE,
                                SectionOffset->QuadPart,
                                SEC_RESERVE);
 
    MmUnlockSectionSegment(Segment);
    MmUnlockAddressSpace(AddressSpace);
 
    return Status;
}

Referenced by CcRosCreateVacb(), and MmMapViewInSystemSpace().

MmMapViewOfArm3Section()

NTSTATUS NTAPI MmMapViewOfArm3Section	(	IN PVOID	SectionObject,
		IN PEPROCESS	Process,
		IN OUT PVOID *	BaseAddress,
		IN ULONG_PTR	ZeroBits,
		IN SIZE_T	CommitSize,
		IN OUT PLARGE_INTEGER SectionOffset	OPTIONAL,
		IN OUT PSIZE_T	ViewSize,
		IN SECTION_INHERIT	InheritDisposition,
		IN ULONG	AllocationType,
		IN ULONG	Protect
	)

Definition at line 2896 of file section.c.

{
    KAPC_STATE ApcState;
    BOOLEAN Attached = FALSE;
    PSECTION Section;
    PCONTROL_AREA ControlArea;
    ULONG ProtectionMask;
    NTSTATUS Status;
    ULONG64 CalculatedViewSize;
    PAGED_CODE();
 
    /* Get the segment and control area */
    Section = (PSECTION)SectionObject;
    ControlArea = Section->Segment->ControlArea;
 
    /* These flags/states are not yet supported by ARM3 */
    ASSERT(Section->u.Flags.Image == 0);
    ASSERT(Section->u.Flags.NoCache == 0);
    ASSERT(Section->u.Flags.WriteCombined == 0);
    ASSERT(ControlArea->u.Flags.PhysicalMemory == 0);
 
    /* FIXME */
    if ((AllocationType & MEM_RESERVE) != 0)
    {
        DPRINT1("MmMapViewOfArm3Section called with MEM_RESERVE, this is not implemented yet!!!\n");
        return STATUS_NOT_IMPLEMENTED;
    }
 
    /* Check if the mapping protection is compatible with the create */
    if (!MiIsProtectionCompatible(Section->InitialPageProtection, Protect))
    {
        DPRINT1("Mapping protection is incompatible\n");
        return STATUS_SECTION_PROTECTION;
    }
 
    /* Check if the offset and size would cause an overflow */
    if (((ULONG64)SectionOffset->QuadPart + *ViewSize) <
         (ULONG64)SectionOffset->QuadPart)
    {
        DPRINT1("Section offset overflows\n");
        return STATUS_INVALID_VIEW_SIZE;
    }
 
    /* Check if the offset and size are bigger than the section itself */
    if (((ULONG64)SectionOffset->QuadPart + *ViewSize) >
         (ULONG64)Section->SizeOfSection.QuadPart)
    {
        DPRINT1("Section offset is larger than section\n");
        return STATUS_INVALID_VIEW_SIZE;
    }
 
    /* Check if the caller did not specify a view size */
    if (!(*ViewSize))
    {
        /* Compute it for the caller */
        CalculatedViewSize = Section->SizeOfSection.QuadPart -
                             SectionOffset->QuadPart;
 
        /* Check if it's larger than 4GB or overflows into kernel-mode */
        if (!NT_SUCCESS(RtlULongLongToSIZET(CalculatedViewSize, ViewSize)) ||
            (((ULONG_PTR)MM_HIGHEST_VAD_ADDRESS - (ULONG_PTR)*BaseAddress) < CalculatedViewSize))
        {
            DPRINT1("Section view won't fit\n");
            return STATUS_INVALID_VIEW_SIZE;
        }
    }
 
    /* Check if the commit size is larger than the view size */
    if (CommitSize > *ViewSize)
    {
        DPRINT1("Attempting to commit more than the view itself\n");
        return STATUS_INVALID_PARAMETER_5;
    }
 
    /* Check if the view size is larger than the section */
    if (*ViewSize > (ULONG64)Section->SizeOfSection.QuadPart)
    {
        DPRINT1("The view is larger than the section\n");
        return STATUS_INVALID_VIEW_SIZE;
    }
 
    /* Compute and validate the protection mask */
    ProtectionMask = MiMakeProtectionMask(Protect);
    if (ProtectionMask == MM_INVALID_PROTECTION)
    {
        DPRINT1("The protection is invalid\n");
        return STATUS_INVALID_PAGE_PROTECTION;
    }
 
    /* We only handle pagefile-backed sections, which cannot be writecombined */
    if (Protect & PAGE_WRITECOMBINE)
    {
        DPRINT1("Cannot write combine a pagefile-backed section\n");
        return STATUS_INVALID_PARAMETER_10;
    }
 
    /* Start by attaching to the current process if needed */
    if (PsGetCurrentProcess() != Process)
    {
        KeStackAttachProcess(&Process->Pcb, &ApcState);
        Attached = TRUE;
    }
 
    /* Do the actual mapping */
    Status = MiMapViewOfDataSection(ControlArea,
                                    Process,
                                    BaseAddress,
                                    SectionOffset,
                                    ViewSize,
                                    Section,
                                    InheritDisposition,
                                    ProtectionMask,
                                    CommitSize,
                                    ZeroBits,
                                    AllocationType);
 
    /* Detach if needed, then return status */
    if (Attached) KeUnstackDetachProcess(&ApcState);
    return Status;
}

Referenced by MmMapViewOfSection().

MmMapViewOfSection()

NTSTATUS NTAPI MmMapViewOfSection	(	IN PVOID	SectionObject,
		IN PEPROCESS	Process,
		IN OUT PVOID *	BaseAddress,
		IN ULONG_PTR	ZeroBits,
		IN SIZE_T	CommitSize,
		IN OUT PLARGE_INTEGER SectionOffset	OPTIONAL,
		IN OUT PSIZE_T	ViewSize,
		IN SECTION_INHERIT	InheritDisposition,
		IN ULONG	AllocationType,
		IN ULONG	Protect
	)

Definition at line 3996 of file section.c.

{
    PSECTION Section;
    PMMSUPPORT AddressSpace;
    NTSTATUS Status = STATUS_SUCCESS;
    BOOLEAN NotAtBase = FALSE;
    BOOLEAN IsAttached = FALSE;
    KAPC_STATE ApcState;
 
    if (MiIsRosSectionObject(SectionObject) == FALSE)
    {
        DPRINT("Mapping ARM3 section into %s\n", Process->ImageFileName);
        return MmMapViewOfArm3Section(SectionObject,
                                      Process,
                                      BaseAddress,
                                      ZeroBits,
                                      CommitSize,
                                      SectionOffset,
                                      ViewSize,
                                      InheritDisposition,
                                      AllocationType,
                                      Protect);
    }
 
    ASSERT(Process);
 
    if (!Protect || Protect & ~PAGE_FLAGS_VALID_FOR_SECTION)
    {
        return STATUS_INVALID_PAGE_PROTECTION;
    }
 
    if (PsGetCurrentProcess() != Process)
    {
        KeStackAttachProcess(&Process->Pcb, &ApcState);
        IsAttached = TRUE;
    }
 
    /* FIXME: We should keep this, but it would break code checking equality */
    Protect &= ~PAGE_NOCACHE;
 
    Section = SectionObject;
    AddressSpace = &Process->Vm;
 
    if (Section->u.Flags.NoChange)
        AllocationType |= SEC_NO_CHANGE;
 
    MmLockAddressSpace(AddressSpace);
 
    if (Section->u.Flags.Image)
    {
        ULONG i;
        ULONG NrSegments;
        ULONG_PTR ImageBase;
        SIZE_T ImageSize;
        PMM_IMAGE_SECTION_OBJECT ImageSectionObject;
        PMM_SECTION_SEGMENT SectionSegments;
 
        ImageSectionObject = ((PMM_IMAGE_SECTION_OBJECT)Section->Segment);
        SectionSegments = ImageSectionObject->Segments;
        NrSegments = ImageSectionObject->NrSegments;
 
        ASSERT(ImageSectionObject->RefCount > 0);
 
        ImageBase = (ULONG_PTR)*BaseAddress;
        if (ImageBase == 0)
        {
            ImageBase = (ULONG_PTR)ImageSectionObject->BasedAddress;
        }
 
        ImageSize = 0;
        for (i = 0; i < NrSegments; i++)
        {
            ULONG_PTR MaxExtent;
            MaxExtent = (ULONG_PTR)(SectionSegments[i].Image.VirtualAddress +
                                    SectionSegments[i].Length.QuadPart);
            ImageSize = max(ImageSize, MaxExtent);
        }
 
        ImageSectionObject->ImageInformation.ImageFileSize = (ULONG)ImageSize;
 
        /* Check for an illegal base address */
        if (((ImageBase + ImageSize) > (ULONG_PTR)MM_HIGHEST_VAD_ADDRESS) ||
                ((ImageBase + ImageSize) < ImageSize))
        {
            ASSERT(*BaseAddress == NULL);
            ImageBase = ALIGN_DOWN_BY((ULONG_PTR)MM_HIGHEST_VAD_ADDRESS - ImageSize,
                                      MM_VIRTMEM_GRANULARITY);
            NotAtBase = TRUE;
        }
        else if (ImageBase != ALIGN_DOWN_BY(ImageBase, MM_VIRTMEM_GRANULARITY))
        {
            ASSERT(*BaseAddress == NULL);
            ImageBase = ALIGN_DOWN_BY(ImageBase, MM_VIRTMEM_GRANULARITY);
            NotAtBase = TRUE;
        }
 
        /* Check there is enough space to map the section at that point. */
        if (MmLocateMemoryAreaByRegion(AddressSpace, (PVOID)ImageBase,
                                       PAGE_ROUND_UP(ImageSize)) != NULL)
        {
            /* Fail if the user requested a fixed base address. */
            if ((*BaseAddress) != NULL)
            {
                Status = STATUS_CONFLICTING_ADDRESSES;
                goto Exit;
            }
            /* Otherwise find a gap to map the image. */
            ImageBase = (ULONG_PTR)MmFindGap(AddressSpace, PAGE_ROUND_UP(ImageSize), MM_VIRTMEM_GRANULARITY, FALSE);
            if (ImageBase == 0)
            {
                Status = STATUS_CONFLICTING_ADDRESSES;
                goto Exit;
            }
            /* Remember that we loaded image at a different base address */
            NotAtBase = TRUE;
        }
 
        for (i = 0; i < NrSegments; i++)
        {
            PVOID SBaseAddress = (PVOID)
                                 ((char*)ImageBase + (ULONG_PTR)SectionSegments[i].Image.VirtualAddress);
            MmLockSectionSegment(&SectionSegments[i]);
            Status = MmMapViewOfSegment(AddressSpace,
                                        TRUE,
                                        &SectionSegments[i],
                                        &SBaseAddress,
                                        SectionSegments[i].Length.QuadPart,
                                        SectionSegments[i].Protection,
                                        0,
                                        0);
            MmUnlockSectionSegment(&SectionSegments[i]);
            if (!NT_SUCCESS(Status))
            {
                /* roll-back */
                while (i--)
                {
                    SBaseAddress =  ((char*)ImageBase + (ULONG_PTR)SectionSegments[i].Image.VirtualAddress);
                    MmLockSectionSegment(&SectionSegments[i]);
                    MmUnmapViewOfSegment(AddressSpace, SBaseAddress);
                    MmUnlockSectionSegment(&SectionSegments[i]);
                }
 
                goto Exit;
            }
        }
 
        *BaseAddress = (PVOID)ImageBase;
        *ViewSize = ImageSize;
 
        DPRINT("Mapped %p for section pointer %p\n", ImageSectionObject, ImageSectionObject->FileObject->SectionObjectPointer);
 
        /* One more map */
        InterlockedIncrement(&ImageSectionObject->MapCount);
    }
    else
    {
        PMM_SECTION_SEGMENT Segment = (PMM_SECTION_SEGMENT)Section->Segment;
        LONGLONG ViewOffset;
 
        ASSERT(Segment->RefCount > 0);
 
        /* check for write access */
        if ((Protect & (PAGE_READWRITE|PAGE_EXECUTE_READWRITE)) &&
                !(Section->InitialPageProtection & (PAGE_READWRITE|PAGE_EXECUTE_READWRITE)))
        {
            Status = STATUS_SECTION_PROTECTION;
            goto Exit;
        }
        /* check for read access */
        if ((Protect & (PAGE_READONLY|PAGE_WRITECOPY|PAGE_EXECUTE_READ|PAGE_EXECUTE_WRITECOPY)) &&
                !(Section->InitialPageProtection & (PAGE_READONLY|PAGE_READWRITE|PAGE_WRITECOPY|PAGE_EXECUTE_READ|PAGE_EXECUTE_READWRITE|PAGE_EXECUTE_WRITECOPY)))
        {
            Status = STATUS_SECTION_PROTECTION;
            goto Exit;
        }
        /* check for execute access */
        if ((Protect & (PAGE_EXECUTE|PAGE_EXECUTE_READ|PAGE_EXECUTE_READWRITE|PAGE_EXECUTE_WRITECOPY)) &&
                !(Section->InitialPageProtection & (PAGE_EXECUTE|PAGE_EXECUTE_READ|PAGE_EXECUTE_READWRITE|PAGE_EXECUTE_WRITECOPY)))
        {
            Status = STATUS_SECTION_PROTECTION;
            goto Exit;
        }
 
        if (SectionOffset == NULL)
        {
            ViewOffset = 0;
        }
        else
        {
            ViewOffset = SectionOffset->QuadPart;
        }
 
        if ((ViewOffset % PAGE_SIZE) != 0)
        {
            Status = STATUS_MAPPED_ALIGNMENT;
            goto Exit;
        }
 
        if ((*ViewSize) == 0)
        {
            (*ViewSize) = Section->SizeOfSection.QuadPart - ViewOffset;
        }
        else if ((ExGetPreviousMode() == UserMode) &&
            (((*ViewSize)+ViewOffset) > Section->SizeOfSection.QuadPart) &&
            (!Section->u.Flags.Reserve))
        {
            /* Dubious */
            (*ViewSize) = MIN(Section->SizeOfSection.QuadPart - ViewOffset, SIZE_T_MAX - PAGE_SIZE);
        }
 
        *ViewSize = PAGE_ROUND_UP(*ViewSize);
 
        MmLockSectionSegment(Segment);
        Status = MmMapViewOfSegment(AddressSpace,
                                    FALSE,
                                    Segment,
                                    BaseAddress,
                                    *ViewSize,
                                    Protect,
                                    ViewOffset,
                                    AllocationType & (MEM_TOP_DOWN|SEC_NO_CHANGE));
        MmUnlockSectionSegment(Segment);
        if (!NT_SUCCESS(Status))
        {
            goto Exit;
        }
    }
 
    if (NotAtBase)
        Status = STATUS_IMAGE_NOT_AT_BASE;
    else
        Status = STATUS_SUCCESS;
 
Exit:
 
    MmUnlockAddressSpace(AddressSpace);
 
    if (IsAttached)
    {
        KeUnstackDetachProcess(&ApcState);
    }
 
    return Status;
}

Referenced by _Function_class_(), _Success_(), ExpInitNls(), GDI_MapHandleTable(), IntMapDesktopView(), IntUserHeapCreate(), MapGlobalUserHeap(), MiLoadImageSection(), MmCreatePeb(), MmInitializeProcessAddressSpace(), NtMapViewOfSection(), NtSecureConnectPort(), and PspMapSystemDll().

MmMapViewOfSegment()

static NTSTATUS MmMapViewOfSegment ( PMMSUPPORT  AddressSpace, BOOLEAN  AsImage, PMM_SECTION_SEGMENT  Segment, PVOID *  BaseAddress, SIZE_T  ViewSize, ULONG  Protect, LONGLONG  ViewOffset, ULONG  AllocationType  )

static

Definition at line 3362 of file section.c.

{
    PMEMORY_AREA MArea;
    NTSTATUS Status;
    ULONG Granularity;
 
    ASSERT(ViewSize != 0);
 
    if (Segment->WriteCopy)
    {
        /* We have to do this because the not present fault
         * and access fault handlers depend on the protection
         * that should be granted AFTER the COW fault takes
         * place to be in Region->Protect. The not present fault
         * handler changes this to the correct protection for COW when
         * mapping the pages into the process's address space. If a COW
         * fault takes place, the access fault handler sets the page protection
         * to these values for the newly copied pages
         */
        if (Protect == PAGE_WRITECOPY)
            Protect = PAGE_READWRITE;
        else if (Protect == PAGE_EXECUTE_WRITECOPY)
            Protect = PAGE_EXECUTE_READWRITE;
    }
 
    if (*BaseAddress == NULL)
        Granularity = MM_ALLOCATION_GRANULARITY;
    else
        Granularity = PAGE_SIZE;
 
#ifdef NEWCC
    if (Segment->Flags & MM_DATAFILE_SEGMENT)
    {
        LARGE_INTEGER FileOffset;
        FileOffset.QuadPart = ViewOffset;
        ObReferenceObject(Section);
        return _MiMapViewOfSegment(AddressSpace, Segment, BaseAddress, ViewSize, Protect, &FileOffset, AllocationType, __FILE__, __LINE__);
    }
#endif
    Status = MmCreateMemoryArea(AddressSpace,
                                MEMORY_AREA_SECTION_VIEW,
                                BaseAddress,
                                ViewSize,
                                Protect,
                                &MArea,
                                AllocationType,
                                Granularity);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("Mapping between 0x%p and 0x%p failed (%X).\n",
                (*BaseAddress), (char*)(*BaseAddress) + ViewSize, Status);
        return Status;
    }
 
    InterlockedIncrement64(Segment->ReferenceCount);
 
    MArea->SectionData.Segment = Segment;
    MArea->SectionData.ViewOffset = ViewOffset;
    if (AsImage)
    {
        MArea->VadNode.u.VadFlags.VadType = VadImageMap;
    }
 
    MmInitializeRegion(&MArea->SectionData.RegionListHead,
                       ViewSize, 0, Protect);
 
    return STATUS_SUCCESS;
}

Referenced by MmMapViewInSystemSpaceEx(), and MmMapViewOfSection().

MmNotPresentFaultSectionView()

NTSTATUS NTAPI MmNotPresentFaultSectionView	(	PMMSUPPORT	AddressSpace,
		MEMORY_AREA *	MemoryArea,
		PVOID	Address,
		BOOLEAN	Locked
	)

Definition at line 1532 of file section.c.

{
    LARGE_INTEGER Offset;
    PFN_NUMBER Page;
    NTSTATUS Status;
    PMM_SECTION_SEGMENT Segment;
    ULONG_PTR Entry;
    ULONG_PTR Entry1;
    ULONG Attributes;
    PMM_REGION Region;
    BOOLEAN HasSwapEntry;
    PVOID PAddress;
    PEPROCESS Process = MmGetAddressSpaceOwner(AddressSpace);
    SWAPENTRY SwapEntry;
 
    ASSERT(Locked);
 
    /*
     * There is a window between taking the page fault and locking the
     * address space when another thread could load the page so we check
     * that.
     */
    if (MmIsPagePresent(Process, Address))
    {
        return STATUS_SUCCESS;
    }
 
    if (MmIsDisabledPage(Process, Address))
    {
        return STATUS_ACCESS_VIOLATION;
    }
 
    /*
     * Check for the virtual memory area being deleted.
     */
    if (MemoryArea->DeleteInProgress)
    {
        return STATUS_UNSUCCESSFUL;
    }
 
    PAddress = MM_ROUND_DOWN(Address, PAGE_SIZE);
    Offset.QuadPart = (ULONG_PTR)PAddress - MA_GetStartingAddress(MemoryArea)
                      + MemoryArea->SectionData.ViewOffset;
 
    Segment = MemoryArea->SectionData.Segment;
    Region = MmFindRegion((PVOID)MA_GetStartingAddress(MemoryArea),
                          &MemoryArea->SectionData.RegionListHead,
                          Address, NULL);
    ASSERT(Region != NULL);
 
    /* Check for a NOACCESS mapping */
    if (Region->Protect & PAGE_NOACCESS)
    {
        return STATUS_ACCESS_VIOLATION;
    }
 
    if (Region->Protect & PAGE_GUARD)
    {
        /* Remove it */
        Status = MmAlterRegion(AddressSpace, (PVOID)MA_GetStartingAddress(MemoryArea),
                &MemoryArea->SectionData.RegionListHead,
                Address, PAGE_SIZE, Region->Type, Region->Protect & ~PAGE_GUARD,
                MmAlterViewAttributes);
 
        if (!NT_SUCCESS(Status))
        {
            DPRINT1("Removing PAGE_GUARD protection failed : 0x%08x.\n", Status);
        }
 
        return STATUS_GUARD_PAGE_VIOLATION;
    }
 
    HasSwapEntry = MmIsPageSwapEntry(Process, Address);
 
    /* See if we should use a private page */
    if (HasSwapEntry)
    {
        SWAPENTRY DummyEntry;
 
        MmGetPageFileMapping(Process, Address, &SwapEntry);
        if (SwapEntry == MM_WAIT_ENTRY)
        {
            MmUnlockAddressSpace(AddressSpace);
            KeDelayExecutionThread(KernelMode, FALSE, &TinyTime);
            MmLockAddressSpace(AddressSpace);
            return STATUS_MM_RESTART_OPERATION;
        }
 
        MI_SET_USAGE(MI_USAGE_SECTION);
        if (Process) MI_SET_PROCESS2(Process->ImageFileName);
        if (!Process) MI_SET_PROCESS2("Kernel Section");
        Status = MmRequestPageMemoryConsumer(MC_USER, TRUE, &Page);
        if (!NT_SUCCESS(Status))
        {
            return STATUS_NO_MEMORY;
        }
 
        /*
         * Must be private page we have swapped out.
         */
 
        /*
        * Sanity check
        */
        MmDeletePageFileMapping(Process, Address, &DummyEntry);
        ASSERT(DummyEntry == SwapEntry);
 
        /* Tell everyone else we are serving the fault. */
        MmCreatePageFileMapping(Process, Address, MM_WAIT_ENTRY);
 
        MmUnlockAddressSpace(AddressSpace);
 
        Status = MmReadFromSwapPage(SwapEntry, Page);
        if (!NT_SUCCESS(Status))
        {
            DPRINT1("MmReadFromSwapPage failed, status = %x\n", Status);
            KeBugCheck(MEMORY_MANAGEMENT);
        }
 
        MmLockAddressSpace(AddressSpace);
        MmDeletePageFileMapping(Process, PAddress, &DummyEntry);
        ASSERT(DummyEntry == MM_WAIT_ENTRY);
 
        Status = MmCreateVirtualMapping(Process,
                                        PAddress,
                                        Region->Protect,
                                        Page);
        if (!NT_SUCCESS(Status))
        {
            DPRINT("MmCreateVirtualMapping failed, not out of memory\n");
            KeBugCheck(MEMORY_MANAGEMENT);
            return Status;
        }
 
        /*
         * Store the swap entry for later use.
         */
        MmSetSavedSwapEntryPage(Page, SwapEntry);
 
        /*
         * Add the page to the process's working set
         */
        if (Process) MmInsertRmap(Page, Process, Address);
        /*
         * Finish the operation
         */
        DPRINT("Address 0x%p\n", Address);
        return STATUS_SUCCESS;
    }
 
    /*
     * Lock the segment
     */
    MmLockSectionSegment(Segment);
 
    /*
     * Satisfying a page fault on a map of /Device/PhysicalMemory is easy
     */
    if ((*Segment->Flags) & MM_PHYSICALMEMORY_SEGMENT)
    {
        MmUnlockSectionSegment(Segment);
        /*
         * Just map the desired physical page
         */
        Page = (PFN_NUMBER)(Offset.QuadPart >> PAGE_SHIFT);
        Status = MmCreatePhysicalMapping(Process,
                                         PAddress,
                                         Region->Protect,
                                         Page);
        if (!NT_SUCCESS(Status))
        {
            DPRINT("MmCreateVirtualMappingUnsafe failed, not out of memory\n");
            KeBugCheck(MEMORY_MANAGEMENT);
            return Status;
        }
 
        /*
         * Cleanup and release locks
         */
        DPRINT("Address 0x%p\n", Address);
        return STATUS_SUCCESS;
    }
 
    /*
     * Check if this page needs to be mapped COW
     */
    if ((Segment->WriteCopy) &&
        (Region->Protect == PAGE_READWRITE || Region->Protect == PAGE_EXECUTE_READWRITE))
    {
        Attributes = Region->Protect == PAGE_READWRITE ? PAGE_READONLY : PAGE_EXECUTE_READ;
    }
    else
    {
        Attributes = Region->Protect;
    }
 
 
    /*
     * Get the entry corresponding to the offset within the section
     */
    Entry = MmGetPageEntrySectionSegment(Segment, &Offset);
    if (Entry == 0)
    {
        /*
         * If the entry is zero, then we need to load the page.
         */
        if ((Offset.QuadPart >= (LONGLONG)PAGE_ROUND_UP(Segment->RawLength.QuadPart)) && (MemoryArea->VadNode.u.VadFlags.VadType == VadImageMap))
        {
            /* We are beyond the data which is on file. Just get a new page. */
            MI_SET_USAGE(MI_USAGE_SECTION);
            if (Process) MI_SET_PROCESS2(Process->ImageFileName);
            if (!Process) MI_SET_PROCESS2("Kernel Section");
            Status = MmRequestPageMemoryConsumer(MC_USER, FALSE, &Page);
            if (!NT_SUCCESS(Status))
            {
                MmUnlockSectionSegment(Segment);
                return STATUS_NO_MEMORY;
            }
            MmSetPageEntrySectionSegment(Segment, &Offset, MAKE_SSE(Page << PAGE_SHIFT, 1));
            MmUnlockSectionSegment(Segment);
 
            Status = MmCreateVirtualMapping(Process, PAddress, Attributes, Page);
            if (!NT_SUCCESS(Status))
            {
                DPRINT1("Unable to create virtual mapping\n");
                KeBugCheck(MEMORY_MANAGEMENT);
            }
            ASSERT(MmIsPagePresent(Process, PAddress));
            if (Process)
                MmInsertRmap(Page, Process, Address);
 
            DPRINT("Address 0x%p\n", Address);
            return STATUS_SUCCESS;
        }
 
        MmUnlockSectionSegment(Segment);
        MmUnlockAddressSpace(AddressSpace);
 
        /* The data must be paged in. Lock the file, so that the VDL doesn't get updated behind us. */
        FsRtlAcquireFileExclusive(Segment->FileObject);
 
        PFSRTL_COMMON_FCB_HEADER FcbHeader = Segment->FileObject->FsContext;
 
        Status = MmMakeSegmentResident(Segment, Offset.QuadPart, PAGE_SIZE, &FcbHeader->ValidDataLength, FALSE);
 
        FsRtlReleaseFile(Segment->FileObject);
 
        /* Lock address space again */
        MmLockAddressSpace(AddressSpace);
        if (!NT_SUCCESS(Status))
        {
            if (Status == STATUS_NO_MEMORY)
            {
                return Status;
            }
            /* Damn */
            DPRINT1("Failed to page data in!\n");
            return STATUS_IN_PAGE_ERROR;
        }
 
        /* Everything went fine. Restart the operation */
        return STATUS_MM_RESTART_OPERATION;
    }
    else if (IS_SWAP_FROM_SSE(Entry))
    {
        SWAPENTRY SwapEntry;
 
        SwapEntry = SWAPENTRY_FROM_SSE(Entry);
 
        /* See if a page op is running on this segment. */
        if (SwapEntry == MM_WAIT_ENTRY)
        {
            MmUnlockSectionSegment(Segment);
            MmUnlockAddressSpace(AddressSpace);
            KeDelayExecutionThread(KernelMode, FALSE, &TinyTime);
            MmLockAddressSpace(AddressSpace);
            return STATUS_MM_RESTART_OPERATION;
        }
 
        Status = MmRequestPageMemoryConsumer(MC_USER, TRUE, &Page);
        if (!NT_SUCCESS(Status))
        {
            MmUnlockSectionSegment(Segment);
            return STATUS_NO_MEMORY;
        }
 
        /*
        * Release all our locks and read in the page from disk
        */
        MmSetPageEntrySectionSegment(Segment, &Offset, MAKE_SWAP_SSE(MM_WAIT_ENTRY));
        MmUnlockSectionSegment(Segment);
 
        MmUnlockAddressSpace(AddressSpace);
 
        Status = MmReadFromSwapPage(SwapEntry, Page);
        if (!NT_SUCCESS(Status))
        {
            KeBugCheck(MEMORY_MANAGEMENT);
        }
 
        /*
         * Relock the address space and segment
         */
        MmLockAddressSpace(AddressSpace);
        MmLockSectionSegment(Segment);
 
        /*
         * Check the entry. No one should change the status of a page
         * that has a pending page-in.
         */
        Entry1 = MmGetPageEntrySectionSegment(Segment, &Offset);
        if (Entry1 != MAKE_SWAP_SSE(MM_WAIT_ENTRY))
        {
            DPRINT1("Someone changed ppte entry while we slept (%x vs %x)\n", Entry, Entry1);
            KeBugCheck(MEMORY_MANAGEMENT);
        }
 
        /*
         * Save the swap entry.
         */
        MmSetSavedSwapEntryPage(Page, SwapEntry);
 
        /* Map the page into the process address space */
        Status = MmCreateVirtualMapping(Process,
                                        PAddress,
                                        Attributes,
                                        Page);
        if (!NT_SUCCESS(Status))
        {
            DPRINT1("Unable to create virtual mapping\n");
            KeBugCheck(MEMORY_MANAGEMENT);
        }
        if (Process)
            MmInsertRmap(Page, Process, Address);
 
        /*
         * Mark the offset within the section as having valid, in-memory
         * data
         */
        Entry = MAKE_SSE(Page << PAGE_SHIFT, 1);
        MmSetPageEntrySectionSegment(Segment, &Offset, Entry);
        MmUnlockSectionSegment(Segment);
 
        DPRINT("Address 0x%p\n", Address);
        return STATUS_SUCCESS;
    }
    else
    {
        /* We already have a page on this section offset. Map it into the process address space. */
        Page = PFN_FROM_SSE(Entry);
 
        Status = MmCreateVirtualMapping(Process,
                                        PAddress,
                                        Attributes,
                                        Page);
        if (!NT_SUCCESS(Status))
        {
            DPRINT1("Unable to create virtual mapping\n");
            KeBugCheck(MEMORY_MANAGEMENT);
        }
 
        if (Process)
            MmInsertRmap(Page, Process, Address);
 
        /* Take a reference on it */
        MmSharePageEntrySectionSegment(Segment, &Offset);
        MmUnlockSectionSegment(Segment);
 
        DPRINT("Address 0x%p\n", Address);
        return STATUS_SUCCESS;
    }
}

Referenced by MmAccessFaultSectionView(), and MmNotPresentFault().

MmpCloseSection()

VOID NTAPI MmpCloseSection	(	IN PEPROCESS Process	OPTIONAL,
		IN PVOID	Object,
		IN ACCESS_MASK	GrantedAccess,
		IN ULONG	ProcessHandleCount,
		IN ULONG	SystemHandleCount
	)

Definition at line 2191 of file section.c.

{
    DPRINT("MmpCloseSection(OB %p, HC %lu)\n", Object, ProcessHandleCount);
}

Referenced by MmInitSectionImplementation().

MmpDeleteSection()

VOID NTAPI MmpDeleteSection

(

PVOID

ObjectBody

)

Definition at line 2138 of file section.c.

{
    PSECTION Section = ObjectBody;
 
    /* Check if it's an ARM3, or ReactOS section */
    if (!MiIsRosSectionObject(Section))
    {
        MiDeleteARM3Section(ObjectBody);
        return;
    }
 
    DPRINT("MmpDeleteSection(ObjectBody %p)\n", ObjectBody);
    if (Section->u.Flags.Image)
    {
        PMM_IMAGE_SECTION_OBJECT ImageSectionObject = (PMM_IMAGE_SECTION_OBJECT)Section->Segment;
 
        /*
         * NOTE: Section->ImageSection can be NULL for short time
         * during the section creating. If we fail for some reason
         * until the image section is properly initialized we shouldn't
         * process further here.
         */
        if (Section->Segment == NULL)
            return;
 
        KIRQL OldIrql = MiAcquirePfnLock();
        ImageSectionObject->SectionCount--;
 
        /* We just dereference the first segment */
        ASSERT(ImageSectionObject->RefCount > 0);
        /* MmDereferenceSegmentWithLock releases PFN lock */
        MmDereferenceSegmentWithLock(ImageSectionObject->Segments, OldIrql);
    }
    else
    {
        PMM_SECTION_SEGMENT Segment = (PMM_SECTION_SEGMENT)Section->Segment;
 
        /*
         * NOTE: Section->Segment can be NULL for short time
         * during the section creating.
         */
        if (Segment == NULL)
            return;
 
        KIRQL OldIrql = MiAcquirePfnLock();
        Segment->SectionCount--;
 
        /* MmDereferenceSegmentWithLock releases PFN lock */
        MmDereferenceSegmentWithLock(Segment, OldIrql);
    }
}

Referenced by MmInitSectionImplementation().

MmpFreePageFileSegment()

VOID NTAPI MmpFreePageFileSegment

(

PMM_SECTION_SEGMENT

Segment

)

Definition at line 917 of file section.c.

{
    ULONG Length;
    LARGE_INTEGER Offset;
    ULONG_PTR Entry;
    SWAPENTRY SavedSwapEntry;
    PFN_NUMBER Page;
 
    Page = 0;
 
    MmLockSectionSegment(Segment);
 
    Length = PAGE_ROUND_UP(Segment->Length.QuadPart);
    for (Offset.QuadPart = 0; Offset.QuadPart < Length; Offset.QuadPart += PAGE_SIZE)
    {
        Entry = MmGetPageEntrySectionSegment(Segment, &Offset);
        if (Entry)
        {
            MmSetPageEntrySectionSegment(Segment, &Offset, 0);
            if (IS_SWAP_FROM_SSE(Entry))
            {
                MmFreeSwapPage(SWAPENTRY_FROM_SSE(Entry));
            }
            else
            {
                Page = PFN_FROM_SSE(Entry);
                SavedSwapEntry = MmGetSavedSwapEntryPage(Page);
                if (SavedSwapEntry != 0)
                {
                    MmSetSavedSwapEntryPage(Page, 0);
                    MmFreeSwapPage(SavedSwapEntry);
                }
                MmReleasePageMemoryConsumer(MC_USER, Page);
            }
        }
    }
 
    MmUnlockSectionSegment(Segment);
}

Referenced by _When_().

MmProtectSectionView()

NTSTATUS NTAPI MmProtectSectionView	(	PMMSUPPORT	AddressSpace,
		PMEMORY_AREA	MemoryArea,
		PVOID	BaseAddress,
		SIZE_T	Length,
		ULONG	Protect,
		PULONG	OldProtect
	)

Definition at line 2063 of file section.c.

{
    PMM_REGION Region;
    NTSTATUS Status;
    ULONG_PTR MaxLength;
 
    MaxLength = MA_GetEndingAddress(MemoryArea) - (ULONG_PTR)BaseAddress;
    if (Length > MaxLength)
        Length = (ULONG)MaxLength;
 
    Region = MmFindRegion((PVOID)MA_GetStartingAddress(MemoryArea),
                          &MemoryArea->SectionData.RegionListHead,
                          BaseAddress, NULL);
    ASSERT(Region != NULL);
 
    if ((MemoryArea->Flags & SEC_NO_CHANGE) &&
            Region->Protect != Protect)
    {
        return STATUS_INVALID_PAGE_PROTECTION;
    }
 
    *OldProtect = Region->Protect;
    Status = MmAlterRegion(AddressSpace, (PVOID)MA_GetStartingAddress(MemoryArea),
                           &MemoryArea->SectionData.RegionListHead,
                           BaseAddress, Length, Region->Type, Protect,
                           MmAlterViewAttributes);
 
    return Status;
}

Referenced by MiRosProtectVirtualMemory().

MmPurgeSegment()

BOOLEAN NTAPI MmPurgeSegment	(	_In_ PSECTION_OBJECT_POINTERS	SectionObjectPointer,
		_In_opt_ PLARGE_INTEGER	Offset,
		_In_ ULONG	Length
	)

Definition at line 4828 of file section.c.

{
    LARGE_INTEGER PurgeStart, PurgeEnd;
    PMM_SECTION_SEGMENT Segment;
 
    Segment = MiGrabDataSection(SectionObjectPointer);
    if (!Segment)
    {
        /* Nothing to purge */
        return TRUE;
    }
 
    PurgeStart.QuadPart = Offset ? Offset->QuadPart : 0LL;
    if (Length && Offset)
    {
        if (!NT_SUCCESS(RtlLongLongAdd(PurgeStart.QuadPart, Length, &PurgeEnd.QuadPart)))
            return FALSE;
    }
 
    MmLockSectionSegment(Segment);
 
    if (!Length || !Offset)
    {
        /* We must calculate the length for ourselves */
        /* FIXME: All of this is suboptimal */
        ULONG ElemCount = RtlNumberGenericTableElements(&Segment->PageTable);
        /* No page. Nothing to purge */
        if (!ElemCount)
        {
            MmUnlockSectionSegment(Segment);
            MmDereferenceSegment(Segment);
            return TRUE;
        }
 
        PCACHE_SECTION_PAGE_TABLE PageTable = RtlGetElementGenericTable(&Segment->PageTable, ElemCount - 1);
        PurgeEnd.QuadPart = PageTable->FileOffset.QuadPart + _countof(PageTable->PageEntries) * PAGE_SIZE;
    }
 
    while (PurgeStart.QuadPart < PurgeEnd.QuadPart)
    {
        ULONG_PTR Entry = MmGetPageEntrySectionSegment(Segment, &PurgeStart);
 
        if (Entry == 0)
        {
            PurgeStart.QuadPart += PAGE_SIZE;
            continue;
        }
 
        if (IS_SWAP_FROM_SSE(Entry))
        {
            ASSERT(SWAPENTRY_FROM_SSE(Entry) == MM_WAIT_ENTRY);
            /* The page is currently being read. Meaning someone will need it soon. Bad luck */
            MmUnlockSectionSegment(Segment);
            MmDereferenceSegment(Segment);
            return FALSE;
        }
 
        if (IS_WRITE_SSE(Entry))
        {
            /* We're trying to purge an entry which is being written. Restart this loop iteration */
            MmUnlockSectionSegment(Segment);
            KeDelayExecutionThread(KernelMode, FALSE, &TinyTime);
            MmLockSectionSegment(Segment);
            continue;
        }
 
        if (SHARE_COUNT_FROM_SSE(Entry) > 0)
        {
            /* This page is currently in use. Bad luck */
            MmUnlockSectionSegment(Segment);
            MmDereferenceSegment(Segment);
            return FALSE;
        }
 
        /* We can let this page go */
        MmSetPageEntrySectionSegment(Segment, &PurgeStart, 0);
        MmReleasePageMemoryConsumer(MC_USER, PFN_FROM_SSE(Entry));
 
        PurgeStart.QuadPart += PAGE_SIZE;
    }
 
    /* This page is currently in use. Bad luck */
    MmUnlockSectionSegment(Segment);
    MmDereferenceSegment(Segment);
    return TRUE;
}

Referenced by CcPurgeCacheSection().

MmQuerySectionView()

NTSTATUS NTAPI MmQuerySectionView	(	PMEMORY_AREA	MemoryArea,
		PVOID	Address,
		PMEMORY_BASIC_INFORMATION	Info,
		PSIZE_T	ResultLength
	)

Definition at line 2099 of file section.c.

{
    PMM_REGION Region;
    PVOID RegionBaseAddress;
    PMM_SECTION_SEGMENT Segment;
 
    Region = MmFindRegion((PVOID)MA_GetStartingAddress(MemoryArea),
                          &MemoryArea->SectionData.RegionListHead,
                          Address, &RegionBaseAddress);
    if (Region == NULL)
    {
        return STATUS_UNSUCCESSFUL;
    }
 
    if (MemoryArea->VadNode.u.VadFlags.VadType == VadImageMap)
    {
        Segment = MemoryArea->SectionData.Segment;
        Info->AllocationBase = (PUCHAR)MA_GetStartingAddress(MemoryArea) - Segment->Image.VirtualAddress;
        Info->Type = MEM_IMAGE;
    }
    else
    {
        Info->AllocationBase = (PVOID)MA_GetStartingAddress(MemoryArea);
        Info->Type = MEM_MAPPED;
    }
    Info->BaseAddress = RegionBaseAddress;
    Info->AllocationProtect = MmProtectToValue[MemoryArea->VadNode.u.VadFlags.Protection];
    Info->RegionSize = Region->Length;
    Info->State = MEM_COMMIT;
    Info->Protect = Region->Protect;
 
    *ResultLength = sizeof(MEMORY_BASIC_INFORMATION);
    return STATUS_SUCCESS;
}

Referenced by MiQueryMemoryBasicInformation().

MmSharePageEntrySectionSegment()

VOID NTAPI MmSharePageEntrySectionSegment	(	PMM_SECTION_SEGMENT	Segment,
		PLARGE_INTEGER	Offset
	)

Definition at line 1064 of file section.c.

{
    ULONG_PTR Entry;
 
    Entry = MmGetPageEntrySectionSegment(Segment, Offset);
    if (Entry == 0)
    {
        DPRINT1("Entry == 0 for MmSharePageEntrySectionSegment\n");
        KeBugCheck(MEMORY_MANAGEMENT);
    }
    if (SHARE_COUNT_FROM_SSE(Entry) == MAX_SHARE_COUNT)
    {
        DPRINT1("Maximum share count reached\n");
        KeBugCheck(MEMORY_MANAGEMENT);
    }
    if (IS_SWAP_FROM_SSE(Entry))
    {
        KeBugCheck(MEMORY_MANAGEMENT);
    }
    MmSetPageEntrySectionSegment(Segment, Offset, BUMPREF_SSE(Entry));
}

Referenced by MmNotPresentFaultSectionView().

MmspAssertSegmentsNoOverlap()

static VOID NTAPI MmspAssertSegmentsNoOverlap ( IN PMM_IMAGE_SECTION_OBJECT  ImageSectionObject )

static

Definition at line 2707 of file section.c.

{
    ULONG i;
 
    MmspAssertSegmentsSorted(ImageSectionObject);
 
    for( i = 0; i < ImageSectionObject->NrSegments; ++ i )
    {
        ASSERT(ImageSectionObject->Segments[i].Length.QuadPart > 0);
 
        if(i > 0)
        {
            ASSERT(ImageSectionObject->Segments[i].Image.VirtualAddress >=
                   (ImageSectionObject->Segments[i - 1].Image.VirtualAddress +
                    ImageSectionObject->Segments[i - 1].Length.QuadPart));
        }
    }
}

Referenced by MmspCheckSegmentBounds().

MmspAssertSegmentsPageAligned()

static VOID NTAPI MmspAssertSegmentsPageAligned ( IN PMM_IMAGE_SECTION_OBJECT  ImageSectionObject )

static

Definition at line 2729 of file section.c.

{
    ULONG i;
 
    for( i = 0; i < ImageSectionObject->NrSegments; ++ i )
    {
        ASSERT((ImageSectionObject->Segments[i].Image.VirtualAddress % PAGE_SIZE) == 0);
        ASSERT((ImageSectionObject->Segments[i].Length.QuadPart % PAGE_SIZE) == 0);
    }
}

Referenced by MmspPageAlignSegments().

MmspAssertSegmentsSorted()

static VOID NTAPI MmspAssertSegmentsSorted ( IN PMM_IMAGE_SECTION_OBJECT  ImageSectionObject )

static

Definition at line 2693 of file section.c.

{
    ULONG i;
 
    for( i = 1; i < ImageSectionObject->NrSegments; ++ i )
    {
        ASSERT(ImageSectionObject->Segments[i].Image.VirtualAddress >=
               ImageSectionObject->Segments[i - 1].Image.VirtualAddress);
    }
}

Referenced by MmspAssertSegmentsNoOverlap(), and MmspSortSegments().

MmspCheckSegmentBounds()

static BOOLEAN NTAPI MmspCheckSegmentBounds ( IN OUT PMM_IMAGE_SECTION_OBJECT  ImageSectionObject, IN ULONG  Flags  )

static

Definition at line 2789 of file section.c.

{
    ULONG i;
 
    if (Flags & EXEFMT_LOAD_ASSUME_SEGMENTS_NO_OVERLAP)
    {
        MmspAssertSegmentsNoOverlap(ImageSectionObject);
        return TRUE;
    }
 
    ASSERT(ImageSectionObject->NrSegments >= 1);
 
    for ( i = 0; i < ImageSectionObject->NrSegments; ++ i )
    {
        if(ImageSectionObject->Segments[i].Length.QuadPart == 0)
        {
            return FALSE;
        }
 
        if(i > 0)
        {
            /*
             * TODO: relax the limitation on gaps. For example, gaps smaller than a
             * page could be OK (Windows seems to be OK with them), and larger gaps
             * could lead to image sections spanning several discontiguous regions
             * (NtMapViewOfSection could then refuse to map them, and they could
             * e.g. only be allowed as parameters to NtCreateProcess, like on UNIX)
             */
            if ((ImageSectionObject->Segments[i - 1].Image.VirtualAddress +
                    ImageSectionObject->Segments[i - 1].Length.QuadPart) !=
                    ImageSectionObject->Segments[i].Image.VirtualAddress)
            {
                return FALSE;
            }
        }
    }
 
    return TRUE;
}

Referenced by ExeFmtpCreateImageSection().

MmspCompareSegments()

static int __cdecl MmspCompareSegments ( const void *  x, const void *  y  )

static

Definition at line 2744 of file section.c.

{
    const MM_SECTION_SEGMENT *Segment1 = (const MM_SECTION_SEGMENT *)x;
    const MM_SECTION_SEGMENT *Segment2 = (const MM_SECTION_SEGMENT *)y;
 
    if (Segment1->Image.VirtualAddress > Segment2->Image.VirtualAddress)
        return 1;
    else if (Segment1->Image.VirtualAddress < Segment2->Image.VirtualAddress)
        return -1;
    else
        return 0;
}

Referenced by MmspSortSegments().

MmspPageAlignSegments()

static BOOLEAN NTAPI MmspPageAlignSegments ( IN OUT PMM_IMAGE_SECTION_OBJECT  ImageSectionObject, IN ULONG  Flags  )

static

Definition at line 2840 of file section.c.

{
    ULONG i;
    ULONG LastSegment;
    PMM_SECTION_SEGMENT EffectiveSegment;
 
    if (Flags & EXEFMT_LOAD_ASSUME_SEGMENTS_PAGE_ALIGNED)
    {
        MmspAssertSegmentsPageAligned(ImageSectionObject);
        return TRUE;
    }
 
    LastSegment = 0;
    EffectiveSegment = &ImageSectionObject->Segments[LastSegment];
 
    for ( i = 0; i < ImageSectionObject->NrSegments; ++ i )
    {
        /*
         * The first segment requires special handling
         */
        if (i == 0)
        {
            ULONG_PTR VirtualAddress;
            ULONG_PTR VirtualOffset;
 
            VirtualAddress = EffectiveSegment->Image.VirtualAddress;
 
            /* Round down the virtual address to the nearest page */
            EffectiveSegment->Image.VirtualAddress = PAGE_ROUND_DOWN(VirtualAddress);
 
            /* Round up the virtual size to the nearest page */
            EffectiveSegment->Length.QuadPart = PAGE_ROUND_UP(VirtualAddress + EffectiveSegment->Length.QuadPart) -
                                                EffectiveSegment->Image.VirtualAddress;
 
            /* Adjust the raw address and size */
            VirtualOffset = VirtualAddress - EffectiveSegment->Image.VirtualAddress;
 
            if (EffectiveSegment->Image.FileOffset < VirtualOffset)
            {
                return FALSE;
            }
 
            /*
             * Garbage in, garbage out: unaligned base addresses make the file
             * offset point in curious and odd places, but that's what we were
             * asked for
             */
            EffectiveSegment->Image.FileOffset -= VirtualOffset;
            EffectiveSegment->RawLength.QuadPart += VirtualOffset;
        }
        else
        {
            PMM_SECTION_SEGMENT Segment = &ImageSectionObject->Segments[i];
            ULONG_PTR EndOfEffectiveSegment;
 
            EndOfEffectiveSegment = (ULONG_PTR)(EffectiveSegment->Image.VirtualAddress + EffectiveSegment->Length.QuadPart);
            ASSERT((EndOfEffectiveSegment % PAGE_SIZE) == 0);
 
            /*
             * The current segment begins exactly where the current effective
             * segment ended, therefore beginning a new effective segment
             */
            if (EndOfEffectiveSegment == Segment->Image.VirtualAddress)
            {
                LastSegment ++;
                ASSERT(LastSegment <= i);
                ASSERT(LastSegment < ImageSectionObject->NrSegments);
 
                EffectiveSegment = &ImageSectionObject->Segments[LastSegment];
 
                if (LastSegment != i)
                {
                    /*
                     * Copy the current segment. If necessary, the effective segment
                     * will be expanded later
                     */
                    *EffectiveSegment = *Segment;
                }
 
                /*
                 * Page-align the virtual size. We know for sure the virtual address
                 * already is
                 */
                ASSERT((EffectiveSegment->Image.VirtualAddress % PAGE_SIZE) == 0);
                EffectiveSegment->Length.QuadPart = PAGE_ROUND_UP(EffectiveSegment->Length.QuadPart);
            }
            /*
             * The current segment is still part of the current effective segment:
             * extend the effective segment to reflect this
             */
            else if (EndOfEffectiveSegment > Segment->Image.VirtualAddress)
            {
                static const ULONG FlagsToProtection[16] =
                {
                    PAGE_NOACCESS,
                    PAGE_READONLY,
                    PAGE_READWRITE,
                    PAGE_READWRITE,
                    PAGE_EXECUTE_READ,
                    PAGE_EXECUTE_READ,
                    PAGE_EXECUTE_READWRITE,
                    PAGE_EXECUTE_READWRITE,
                    PAGE_WRITECOPY,
                    PAGE_WRITECOPY,
                    PAGE_WRITECOPY,
                    PAGE_WRITECOPY,
                    PAGE_EXECUTE_WRITECOPY,
                    PAGE_EXECUTE_WRITECOPY,
                    PAGE_EXECUTE_WRITECOPY,
                    PAGE_EXECUTE_WRITECOPY
                };
 
                unsigned ProtectionFlags;
 
                /*
                 * Extend the file size
                 */
 
                /* Unaligned segments must be contiguous within the file */
                if (Segment->Image.FileOffset != (EffectiveSegment->Image.FileOffset +
                                                  EffectiveSegment->RawLength.QuadPart))
                {
                    return FALSE;
                }
 
                EffectiveSegment->RawLength.QuadPart += Segment->RawLength.QuadPart;
 
                /*
                 * Extend the virtual size
                 */
                ASSERT(PAGE_ROUND_UP(Segment->Image.VirtualAddress + Segment->Length.QuadPart) >= EndOfEffectiveSegment);
 
                EffectiveSegment->Length.QuadPart = PAGE_ROUND_UP(Segment->Image.VirtualAddress + Segment->Length.QuadPart) -
                                                    EffectiveSegment->Image.VirtualAddress;
 
                /*
                 * Merge the protection
                 */
                EffectiveSegment->Protection |= Segment->Protection;
 
                /* Clean up redundance */
                ProtectionFlags = 0;
 
                if(EffectiveSegment->Protection & PAGE_IS_READABLE)
                    ProtectionFlags |= 1 << 0;
 
                if(EffectiveSegment->Protection & PAGE_IS_WRITABLE)
                    ProtectionFlags |= 1 << 1;
 
                if(EffectiveSegment->Protection & PAGE_IS_EXECUTABLE)
                    ProtectionFlags |= 1 << 2;
 
                if(EffectiveSegment->Protection & PAGE_IS_WRITECOPY)
                    ProtectionFlags |= 1 << 3;
 
                ASSERT(ProtectionFlags < 16);
                EffectiveSegment->Protection = FlagsToProtection[ProtectionFlags];
 
                /* If a segment was required to be shared and cannot, fail */
                if(!(Segment->Protection & PAGE_IS_WRITECOPY) &&
                        EffectiveSegment->Protection & PAGE_IS_WRITECOPY)
                {
                    return FALSE;
                }
            }
            /*
             * We assume no holes between segments at this point
             */
            else
            {
                KeBugCheck(MEMORY_MANAGEMENT);
            }
        }
    }
    ImageSectionObject->NrSegments = LastSegment + 1;
 
    return TRUE;
}

Referenced by ExeFmtpCreateImageSection().

MmspSortSegments()

static VOID NTAPI MmspSortSegments ( IN OUT PMM_IMAGE_SECTION_OBJECT  ImageSectionObject, IN ULONG  Flags  )

static

Definition at line 2764 of file section.c.

{
    if (Flags & EXEFMT_LOAD_ASSUME_SEGMENTS_SORTED)
    {
        MmspAssertSegmentsSorted(ImageSectionObject);
    }
    else
    {
        qsort(ImageSectionObject->Segments,
              ImageSectionObject->NrSegments,
              sizeof(ImageSectionObject->Segments[0]),
              MmspCompareSegments);
    }
}

Referenced by ExeFmtpCreateImageSection().

MmspWaitForFileLock()

NTSTATUS MmspWaitForFileLock

(

PFILE_OBJECT

File

)

Definition at line 907 of file section.c.

{
    return STATUS_SUCCESS;
    //return KeWaitForSingleObject(&File->Lock, 0, KernelMode, FALSE, NULL);
}

Referenced by MmCreateDataFileSection(), and MmCreateImageSection().

MmUnmapViewOfSegment()

static NTSTATUS MmUnmapViewOfSegment ( PMMSUPPORT  AddressSpace, PVOID  BaseAddress  )

static

Definition at line 3525 of file section.c.

{
    NTSTATUS Status;
    PMEMORY_AREA MemoryArea;
    PMM_SECTION_SEGMENT Segment;
    PLIST_ENTRY CurrentEntry;
    PMM_REGION CurrentRegion;
    PLIST_ENTRY RegionListHead;
 
    MemoryArea = MmLocateMemoryAreaByAddress(AddressSpace,
                 BaseAddress);
    if (MemoryArea == NULL)
    {
        return STATUS_UNSUCCESSFUL;
    }
 
    Segment = MemoryArea->SectionData.Segment;
 
#ifdef NEWCC
    if (Segment->Flags & MM_DATAFILE_SEGMENT)
    {
        MmUnlockAddressSpace(AddressSpace);
        Status = MmUnmapViewOfCacheSegment(AddressSpace, BaseAddress);
        MmLockAddressSpace(AddressSpace);
 
        return Status;
    }
#endif
 
    MemoryArea->DeleteInProgress = TRUE;
 
    MmLockSectionSegment(Segment);
 
    RegionListHead = &MemoryArea->SectionData.RegionListHead;
    while (!IsListEmpty(RegionListHead))
    {
        CurrentEntry = RemoveHeadList(RegionListHead);
        CurrentRegion = CONTAINING_RECORD(CurrentEntry, MM_REGION, RegionListEntry);
        ExFreePoolWithTag(CurrentRegion, TAG_MM_REGION);
    }
 
    if ((*Segment->Flags) & MM_PHYSICALMEMORY_SEGMENT)
    {
        Status = MmFreeMemoryArea(AddressSpace,
                                  MemoryArea,
                                  NULL,
                                  NULL);
    }
    else
    {
        Status = MmFreeMemoryArea(AddressSpace,
                                  MemoryArea,
                                  MmFreeSectionPage,
                                  AddressSpace);
    }
    MmUnlockSectionSegment(Segment);
    MmDereferenceSegment(Segment);
    return Status;
}

Referenced by MiRosUnmapViewInSystemSpace(), MiRosUnmapViewOfSection(), and MmMapViewOfSection().

MmUnsharePageEntrySectionSegment()

BOOLEAN NTAPI MmUnsharePageEntrySectionSegment	(	PMEMORY_AREA	MemoryArea,
		PMM_SECTION_SEGMENT	Segment,
		PLARGE_INTEGER	Offset,
		BOOLEAN	Dirty,
		BOOLEAN	PageOut,
		ULONG_PTR *	InEntry
	)

Definition at line 1089 of file section.c.

{
    ULONG_PTR Entry = InEntry ? *InEntry : MmGetPageEntrySectionSegment(Segment, Offset);
    PFN_NUMBER Page = PFN_FROM_SSE(Entry);
    BOOLEAN IsDataMap = BooleanFlagOn(*Segment->Flags, MM_DATAFILE_SEGMENT);
    SWAPENTRY SwapEntry;
 
    if (Entry == 0)
    {
        DPRINT1("Entry == 0 for MmUnsharePageEntrySectionSegment\n");
        KeBugCheck(MEMORY_MANAGEMENT);
    }
    if (SHARE_COUNT_FROM_SSE(Entry) == 0)
    {
        DPRINT1("Zero share count for unshare (Seg %p Offset %x Page %x)\n", Segment, Offset->LowPart, PFN_FROM_SSE(Entry));
        KeBugCheck(MEMORY_MANAGEMENT);
    }
    if (IS_SWAP_FROM_SSE(Entry))
    {
        KeBugCheck(MEMORY_MANAGEMENT);
    }
    Entry = DECREF_SSE(Entry);
    if (Dirty) Entry = DIRTY_SSE(Entry);
 
    /* If we are paging-out, pruning the page for real will be taken care of in MmCheckDirtySegment */
    if ((SHARE_COUNT_FROM_SSE(Entry) > 0) || PageOut)
    {
        /* Update the page mapping in the segment and we're done */
        MmSetPageEntrySectionSegment(Segment, Offset, Entry);
        return FALSE;
    }
 
    /* We are pruning the last mapping on this page. See if we can keep it a bit more. */
    ASSERT(!PageOut);
 
    if (IsDataMap)
    {
        /* We can always keep memory in for data maps */
        MmSetPageEntrySectionSegment(Segment, Offset, Entry);
        return FALSE;
    }
 
    if (!FlagOn(Segment->Image.Characteristics, IMAGE_SCN_MEM_SHARED))
    {
        ASSERT(Segment->WriteCopy);
        ASSERT(!IS_DIRTY_SSE(Entry));
        ASSERT(MmGetSavedSwapEntryPage(Page) == 0);
        /* So this must have been a read-only page. Keep it ! */
        MmSetPageEntrySectionSegment(Segment, Offset, Entry);
        return FALSE;
    }
 
    /*
     * So this is a page for a shared section of a DLL.
     * We can keep it if it is not dirty.
     */
    SwapEntry = MmGetSavedSwapEntryPage(Page);
    if ((SwapEntry == 0) && !IS_DIRTY_SSE(Entry))
    {
        MmSetPageEntrySectionSegment(Segment, Offset, Entry);
        return FALSE;
    }
 
    /* No more processes are referencing this shared dirty page. Ditch it. */
    if (SwapEntry)
    {
        MmSetSavedSwapEntryPage(Page, 0);
        MmFreeSwapPage(SwapEntry);
    }
    MmSetPageEntrySectionSegment(Segment, Offset, 0);
    MmReleasePageMemoryConsumer(MC_USER, Page);
    return TRUE;
}

Referenced by MmAccessFaultSectionView(), MmFreeSectionPage(), and MmPageOutPhysicalAddress().

NtQuerySection()

NTSTATUS NTAPI NtQuerySection	(	_In_ HANDLE	SectionHandle,
		_In_ SECTION_INFORMATION_CLASS	SectionInformationClass,
		_Out_ PVOID	SectionInformation,
		_In_ SIZE_T	SectionInformationLength,
		_Out_opt_ PSIZE_T	ResultLength
	)

Queries the information of a section object.

Parameters

SectionHandle	Handle to the section object. It must be opened with SECTION_QUERY access.
SectionInformationClass	Index to a certain information structure. Can be either SectionBasicInformation or SectionImageInformation. The latter is valid only for sections that were created with the SEC_IMAGE flag.
SectionInformation	Caller supplies storage for resulting information.
Length	Size of the supplied storage.
ResultLength	Data written.

Returns

Status.

@implemented

Definition at line 3768 of file section.c.

{
    PSECTION Section;
    KPROCESSOR_MODE PreviousMode;
    NTSTATUS Status;
    PAGED_CODE();
 
    PreviousMode = ExGetPreviousMode();
    if (PreviousMode != KernelMode)
    {
        _SEH2_TRY
        {
            ProbeForWrite(SectionInformation,
                          SectionInformationLength,
                          __alignof(ULONG));
            if (ResultLength != NULL)
            {
                ProbeForWrite(ResultLength,
                              sizeof(*ResultLength),
                              __alignof(SIZE_T));
            }
        }
        _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
        {
            _SEH2_YIELD(return _SEH2_GetExceptionCode());
        }
        _SEH2_END;
    }
 
    if (SectionInformationClass == SectionBasicInformation)
    {
        if (SectionInformationLength < sizeof(SECTION_BASIC_INFORMATION))
        {
            return STATUS_INFO_LENGTH_MISMATCH;
        }
    }
    else if (SectionInformationClass == SectionImageInformation)
    {
        if (SectionInformationLength < sizeof(SECTION_IMAGE_INFORMATION))
        {
            return STATUS_INFO_LENGTH_MISMATCH;
        }
    }
    else
    {
        return STATUS_INVALID_INFO_CLASS;
    }
 
    Status = ObReferenceObjectByHandle(SectionHandle,
                                       SECTION_QUERY,
                                       MmSectionObjectType,
                                       PreviousMode,
                                       (PVOID*)(PVOID)&Section,
                                       NULL);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("Failed to reference section: 0x%lx\n", Status);
        return Status;
    }
 
    switch(SectionInformationClass)
    {
        case SectionBasicInformation:
        {
            SECTION_BASIC_INFORMATION Sbi;
 
            Sbi.Size = Section->SizeOfSection;
            Sbi.BaseAddress = (PVOID)Section->Address.StartingVpn;
 
            Sbi.Attributes = 0;
            if (Section->u.Flags.File)
                Sbi.Attributes |= SEC_FILE;
            if (Section->u.Flags.Image)
                Sbi.Attributes |= SEC_IMAGE;
 
            /* Those are not set *************
            if (Section->u.Flags.Commit)
                Sbi.Attributes |= SEC_COMMIT;
            if (Section->u.Flags.Reserve)
                Sbi.Attributes |= SEC_RESERVE;
            **********************************/
 
            if (Section->u.Flags.Image)
            {
                if (MiIsRosSectionObject(Section))
                {
                    PMM_IMAGE_SECTION_OBJECT ImageSectionObject = ((PMM_IMAGE_SECTION_OBJECT)Section->Segment);
                    Sbi.BaseAddress = 0;
                    Sbi.Size.QuadPart = ImageSectionObject->ImageInformation.ImageFileSize;
                }
                else
                {
                    /* Not supported yet */
                    ASSERT(FALSE);
                }
            }
            else if (MiIsRosSectionObject(Section))
            {
                Sbi.BaseAddress = (PVOID)((PMM_SECTION_SEGMENT)Section->Segment)->Image.VirtualAddress;
                Sbi.Size.QuadPart = ((PMM_SECTION_SEGMENT)Section->Segment)->RawLength.QuadPart;
            }
            else
            {
                DPRINT1("Unimplemented code path\n");
            }
 
            _SEH2_TRY
            {
                *((SECTION_BASIC_INFORMATION*)SectionInformation) = Sbi;
                if (ResultLength != NULL)
                {
                    *ResultLength = sizeof(Sbi);
                }
            }
            _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
            {
                Status = _SEH2_GetExceptionCode();
            }
            _SEH2_END;
            break;
        }
        case SectionImageInformation:
        {
            if (!Section->u.Flags.Image)
            {
                Status = STATUS_SECTION_NOT_IMAGE;
            }
            else if (MiIsRosSectionObject(Section))
            {
                PMM_IMAGE_SECTION_OBJECT ImageSectionObject = ((PMM_IMAGE_SECTION_OBJECT)Section->Segment);
 
                _SEH2_TRY
                {
                    PSECTION_IMAGE_INFORMATION Sii = (PSECTION_IMAGE_INFORMATION)SectionInformation;
                    *Sii = ImageSectionObject->ImageInformation;
                    if (ResultLength != NULL)
                    {
                        *ResultLength = sizeof(*Sii);
                    }
                }
                _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
                {
                    Status = _SEH2_GetExceptionCode();
                }
                _SEH2_END;
            }
            else
            {
                _SEH2_TRY
                {
                    PSECTION_IMAGE_INFORMATION Sii = (PSECTION_IMAGE_INFORMATION)SectionInformation;
                    *Sii = *Section->Segment->u2.ImageInformation;
                    if (ResultLength != NULL)
                        *ResultLength = sizeof(*Sii);
                }
                _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
                {
                    Status = _SEH2_GetExceptionCode();
                }
                _SEH2_END;
            }
            break;
        }
        default:
            DPRINT1("Unknown SectionInformationClass: %d\n", SectionInformationClass);
            Status = STATUS_NOT_SUPPORTED;
    }
 
    ObDereferenceObject(Section);
 
    return Status;
}

Referenced by CreateProcessInternalW(), and get_binary_type().

PeFmtCreateSection()

NTSTATUS NTAPI PeFmtCreateSection	(	IN CONST VOID *	FileHeader,
		IN SIZE_T	FileHeaderSize,
		IN PVOID	File,
		OUT PMM_IMAGE_SECTION_OBJECT	ImageSectionObject,
		OUT PULONG	Flags,
		IN PEXEFMT_CB_READ_FILE	ReadFileCb,
		IN PEXEFMT_CB_ALLOCATE_SEGMENTS	AllocateSegmentsCb
	)

Definition at line 285 of file section.c.

{
    NTSTATUS nStatus;
    ULONG cbFileHeaderOffsetSize = 0;
    ULONG cbSectionHeadersOffset = 0;
    ULONG cbSectionHeadersSize;
    ULONG cbSectionHeadersOffsetSize = 0;
    ULONG cbOptHeaderSize;
    ULONG cbHeadersSize = 0;
    ULONG nSectionAlignment;
    ULONG nFileAlignment;
    ULONG_PTR ImageBase = 0;
    const IMAGE_DOS_HEADER * pidhDosHeader;
    const IMAGE_NT_HEADERS32 * pinhNtHeader;
    const IMAGE_OPTIONAL_HEADER32 * piohOptHeader;
    const IMAGE_SECTION_HEADER * pishSectionHeaders;
    PMM_SECTION_SEGMENT pssSegments;
    LARGE_INTEGER lnOffset;
    PVOID pBuffer;
    SIZE_T nPrevVirtualEndOfSegment = 0;
    ULONG nFileSizeOfHeaders = 0;
    ULONG i;
    ULONG AlignedLength;
 
    ASSERT(FileHeader);
    ASSERT(FileHeaderSize > 0);
    ASSERT(File);
    ASSERT(ImageSectionObject);
    ASSERT(ReadFileCb);
    ASSERT(AllocateSegmentsCb);
 
    ASSERT(Intsafe_CanOffsetPointer(FileHeader, FileHeaderSize));
 
    ASSERT(((UINT_PTR)FileHeader % TYPE_ALIGNMENT(IMAGE_DOS_HEADER)) == 0);
 
#define DIE(ARGS_) { DPRINT ARGS_; goto l_Return; }
 
    pBuffer = NULL;
    pidhDosHeader = FileHeader;
 
    /* DOS HEADER */
    nStatus = STATUS_ROS_EXEFMT_UNKNOWN_FORMAT;
 
    /* image too small to be an MZ executable */
    if(FileHeaderSize < sizeof(IMAGE_DOS_HEADER))
        DIE(("Too small to be an MZ executable, size is %lu\n", FileHeaderSize));
 
    /* no MZ signature */
    if(pidhDosHeader->e_magic != IMAGE_DOS_SIGNATURE)
        DIE(("No MZ signature found, e_magic is %hX\n", pidhDosHeader->e_magic));
 
    /* NT HEADER */
    nStatus = STATUS_INVALID_IMAGE_PROTECT;
 
    /* not a Windows executable */
    if(pidhDosHeader->e_lfanew <= 0)
        DIE(("Not a Windows executable, e_lfanew is %d\n", pidhDosHeader->e_lfanew));
 
    if(!Intsafe_AddULong32(&cbFileHeaderOffsetSize, pidhDosHeader->e_lfanew, RTL_SIZEOF_THROUGH_FIELD(IMAGE_NT_HEADERS32, FileHeader)))
        DIE(("The DOS stub is too large, e_lfanew is %X\n", pidhDosHeader->e_lfanew));
 
    if(FileHeaderSize < cbFileHeaderOffsetSize)
        pinhNtHeader = NULL;
    else
    {
        /*
         * we already know that Intsafe_CanOffsetPointer(FileHeader, FileHeaderSize),
         * and FileHeaderSize >= cbFileHeaderOffsetSize, so this holds true too
         */
        ASSERT(Intsafe_CanOffsetPointer(FileHeader, pidhDosHeader->e_lfanew));
        pinhNtHeader = (PVOID)((UINT_PTR)FileHeader + pidhDosHeader->e_lfanew);
    }
 
    /*
     * the buffer doesn't contain the NT file header, or the alignment is wrong: we
     * need to read the header from the file
     */
    if(FileHeaderSize < cbFileHeaderOffsetSize ||
            (UINT_PTR)pinhNtHeader % TYPE_ALIGNMENT(IMAGE_NT_HEADERS32) != 0)
    {
        ULONG cbNtHeaderSize;
        ULONG cbReadSize;
        PVOID pData;
 
l_ReadHeaderFromFile:
        cbNtHeaderSize = 0;
        lnOffset.QuadPart = pidhDosHeader->e_lfanew;
 
        /* read the header from the file */
        nStatus = ReadFileCb(File, &lnOffset, sizeof(IMAGE_NT_HEADERS64), &pData, &pBuffer, &cbReadSize);
 
        if(!NT_SUCCESS(nStatus))
        {
            NTSTATUS ReturnedStatus = nStatus;
 
            /* If it attempted to read past the end of the file, it means e_lfanew is invalid */
            if (ReturnedStatus == STATUS_END_OF_FILE) nStatus = STATUS_INVALID_IMAGE_PROTECT;
 
            DIE(("ReadFile failed, status %08X\n", ReturnedStatus));
        }
 
        ASSERT(pData);
        ASSERT(pBuffer);
        ASSERT(cbReadSize > 0);
 
        nStatus = STATUS_INVALID_IMAGE_FORMAT;
 
        /* the buffer doesn't contain the file header */
        if(cbReadSize < RTL_SIZEOF_THROUGH_FIELD(IMAGE_NT_HEADERS32, FileHeader))
            DIE(("The file doesn't contain the PE file header\n"));
 
        pinhNtHeader = pData;
 
        /* object still not aligned: copy it to the beginning of the buffer */
        if((UINT_PTR)pinhNtHeader % TYPE_ALIGNMENT(IMAGE_NT_HEADERS32) != 0)
        {
            ASSERT((UINT_PTR)pBuffer % TYPE_ALIGNMENT(IMAGE_NT_HEADERS32) == 0);
            RtlMoveMemory(pBuffer, pData, cbReadSize);
            pinhNtHeader = pBuffer;
        }
 
        /* invalid NT header */
        nStatus = STATUS_INVALID_IMAGE_PROTECT;
 
        if(pinhNtHeader->Signature != IMAGE_NT_SIGNATURE)
            DIE(("The file isn't a PE executable, Signature is %X\n", pinhNtHeader->Signature));
 
        nStatus = STATUS_INVALID_IMAGE_FORMAT;
 
        if(!Intsafe_AddULong32(&cbNtHeaderSize, pinhNtHeader->FileHeader.SizeOfOptionalHeader, FIELD_OFFSET(IMAGE_NT_HEADERS32, OptionalHeader)))
            DIE(("The full NT header is too large\n"));
 
        /* the buffer doesn't contain the whole NT header */
        if(cbReadSize < cbNtHeaderSize)
            DIE(("The file doesn't contain the full NT header\n"));
    }
    else
    {
        ULONG cbOptHeaderOffsetSize = 0;
 
        nStatus = STATUS_INVALID_IMAGE_PROTECT;
 
        /* don't trust an invalid NT header */
        if(pinhNtHeader->Signature != IMAGE_NT_SIGNATURE)
            DIE(("The file isn't a PE executable, Signature is %X\n", pinhNtHeader->Signature));
 
        if(!Intsafe_AddULong32(&cbOptHeaderOffsetSize, pidhDosHeader->e_lfanew, FIELD_OFFSET(IMAGE_NT_HEADERS32, OptionalHeader)))
            DIE(("The DOS stub is too large, e_lfanew is %X\n", pidhDosHeader->e_lfanew));
 
        nStatus = STATUS_INVALID_IMAGE_FORMAT;
 
        if(!Intsafe_AddULong32(&cbOptHeaderOffsetSize, cbOptHeaderOffsetSize, pinhNtHeader->FileHeader.SizeOfOptionalHeader))
            DIE(("The NT header is too large, SizeOfOptionalHeader is %X\n", pinhNtHeader->FileHeader.SizeOfOptionalHeader));
 
        /* the buffer doesn't contain the whole NT header: read it from the file */
        if(cbOptHeaderOffsetSize > FileHeaderSize)
            goto l_ReadHeaderFromFile;
    }
 
    /* read information from the NT header */
    piohOptHeader = &pinhNtHeader->OptionalHeader;
    cbOptHeaderSize = pinhNtHeader->FileHeader.SizeOfOptionalHeader;
 
    nStatus = STATUS_INVALID_IMAGE_FORMAT;
 
    if(!RTL_CONTAINS_FIELD(piohOptHeader, cbOptHeaderSize, Magic))
        DIE(("The optional header doesn't contain the Magic field, SizeOfOptionalHeader is %X\n", cbOptHeaderSize));
 
    /* ASSUME: RtlZeroMemory(ImageSectionObject, sizeof(*ImageSectionObject)); */
 
    switch(piohOptHeader->Magic)
    {
        case IMAGE_NT_OPTIONAL_HDR64_MAGIC:
#ifndef _WIN64
            nStatus = STATUS_INVALID_IMAGE_WIN_64;
            DIE(("Win64 optional header, unsupported\n"));
#else
            // Fall through.
#endif
        case IMAGE_NT_OPTIONAL_HDR32_MAGIC:
            break;
        default:
            DIE(("Unrecognized optional header, Magic is %X\n", piohOptHeader->Magic));
    }
 
    if (RTL_CONTAINS_FIELD(piohOptHeader, cbOptHeaderSize, SectionAlignment) &&
            RTL_CONTAINS_FIELD(piohOptHeader, cbOptHeaderSize, FileAlignment))
    {
        /* See [1], section 3.4.2 */
        if(piohOptHeader->SectionAlignment < PAGE_SIZE)
        {
            if(piohOptHeader->FileAlignment != piohOptHeader->SectionAlignment)
                DIE(("Sections aren't page-aligned and the file alignment isn't the same\n"));
        }
        else if(piohOptHeader->SectionAlignment < piohOptHeader->FileAlignment)
            DIE(("The section alignment is smaller than the file alignment\n"));
 
        nSectionAlignment = piohOptHeader->SectionAlignment;
        nFileAlignment = piohOptHeader->FileAlignment;
 
        if(!IsPowerOf2(nSectionAlignment) || !IsPowerOf2(nFileAlignment))
            DIE(("The section alignment (%u) and file alignment (%u) aren't both powers of 2\n", nSectionAlignment, nFileAlignment));
    }
    else
    {
        nSectionAlignment = PAGE_SIZE;
        nFileAlignment = PAGE_SIZE;
    }
 
    ASSERT(IsPowerOf2(nSectionAlignment));
    ASSERT(IsPowerOf2(nFileAlignment));
 
    switch(piohOptHeader->Magic)
    {
    /* PE32 */
    case IMAGE_NT_OPTIONAL_HDR32_MAGIC:
    {
        if (RTL_CONTAINS_FIELD(piohOptHeader, cbOptHeaderSize, ImageBase))
            ImageBase = piohOptHeader->ImageBase;
 
        if(RTL_CONTAINS_FIELD(piohOptHeader, cbOptHeaderSize, SizeOfImage))
            ImageSectionObject->ImageInformation.ImageFileSize = piohOptHeader->SizeOfImage;
 
        if(RTL_CONTAINS_FIELD(piohOptHeader, cbOptHeaderSize, SizeOfStackReserve))
            ImageSectionObject->ImageInformation.MaximumStackSize = piohOptHeader->SizeOfStackReserve;
 
        if(RTL_CONTAINS_FIELD(piohOptHeader, cbOptHeaderSize, SizeOfStackCommit))
            ImageSectionObject->ImageInformation.CommittedStackSize = piohOptHeader->SizeOfStackCommit;
 
        if (RTL_CONTAINS_FIELD(piohOptHeader, cbOptHeaderSize, Subsystem))
        {
            ImageSectionObject->ImageInformation.SubSystemType = piohOptHeader->Subsystem;
 
            if (RTL_CONTAINS_FIELD(piohOptHeader, cbOptHeaderSize, MinorSubsystemVersion) &&
                    RTL_CONTAINS_FIELD(piohOptHeader, cbOptHeaderSize, MajorSubsystemVersion))
            {
                ImageSectionObject->ImageInformation.SubSystemMinorVersion = piohOptHeader->MinorSubsystemVersion;
                ImageSectionObject->ImageInformation.SubSystemMajorVersion = piohOptHeader->MajorSubsystemVersion;
            }
        }
 
        if (RTL_CONTAINS_FIELD(piohOptHeader, cbOptHeaderSize, AddressOfEntryPoint))
        {
            ImageSectionObject->ImageInformation.TransferAddress = (PVOID) (ImageBase +
                    piohOptHeader->AddressOfEntryPoint);
        }
 
        if (RTL_CONTAINS_FIELD(piohOptHeader, cbOptHeaderSize, SizeOfCode))
            ImageSectionObject->ImageInformation.ImageContainsCode = piohOptHeader->SizeOfCode != 0;
        else
            ImageSectionObject->ImageInformation.ImageContainsCode = TRUE;
 
        if (RTL_CONTAINS_FIELD(piohOptHeader, cbOptHeaderSize, AddressOfEntryPoint))
        {
            if (piohOptHeader->AddressOfEntryPoint == 0)
            {
                ImageSectionObject->ImageInformation.ImageContainsCode = FALSE;
            }
        }
 
        if (RTL_CONTAINS_FIELD(piohOptHeader, cbOptHeaderSize, LoaderFlags))
            ImageSectionObject->ImageInformation.LoaderFlags = piohOptHeader->LoaderFlags;
 
        if (RTL_CONTAINS_FIELD(piohOptHeader, cbOptHeaderSize, DllCharacteristics))
        {
            ImageSectionObject->ImageInformation.DllCharacteristics = piohOptHeader->DllCharacteristics;
 
            /*
             * Since we don't really implement SxS yet and LD doesn't supoprt /ALLOWISOLATION:NO, hard-code
             * this flag here, which will prevent the loader and other code from doing any .manifest or SxS
             * magic to any binary.
             *
             * This will break applications that depend on SxS when running with real Windows Kernel32/SxS/etc
             * but honestly that's not tested. It will also break them when running no ReactOS once we implement
             * the SxS support -- at which point, duh, this should be removed.
             *
             * But right now, any app depending on SxS is already broken anyway, so this flag only helps.
             */
            ImageSectionObject->ImageInformation.DllCharacteristics |= IMAGE_DLLCHARACTERISTICS_NO_ISOLATION;
        }
 
        break;
    }
#ifdef _WIN64
    /* PE64 */
    case IMAGE_NT_OPTIONAL_HDR64_MAGIC:
    {
        const IMAGE_OPTIONAL_HEADER64 * pioh64OptHeader;
 
        pioh64OptHeader = (const IMAGE_OPTIONAL_HEADER64 *)piohOptHeader;
 
        if(RTL_CONTAINS_FIELD(pioh64OptHeader, cbOptHeaderSize, ImageBase))
        {
            ImageBase = pioh64OptHeader->ImageBase;
            if(pioh64OptHeader->ImageBase > MAXULONG_PTR)
                DIE(("ImageBase exceeds the address space\n"));
        }
 
        if(RTL_CONTAINS_FIELD(pioh64OptHeader, cbOptHeaderSize, SizeOfImage))
        {
            if(pioh64OptHeader->SizeOfImage > MAXULONG_PTR)
                DIE(("SizeOfImage exceeds the address space\n"));
 
            ImageSectionObject->ImageInformation.ImageFileSize = pioh64OptHeader->SizeOfImage;
        }
 
        if(RTL_CONTAINS_FIELD(pioh64OptHeader, cbOptHeaderSize, SizeOfStackReserve))
        {
            if(pioh64OptHeader->SizeOfStackReserve > MAXULONG_PTR)
                DIE(("SizeOfStackReserve exceeds the address space\n"));
 
            ImageSectionObject->ImageInformation.MaximumStackSize = (ULONG_PTR) pioh64OptHeader->SizeOfStackReserve;
        }
 
        if(RTL_CONTAINS_FIELD(pioh64OptHeader, cbOptHeaderSize, SizeOfStackCommit))
        {
            if(pioh64OptHeader->SizeOfStackCommit > MAXULONG_PTR)
                DIE(("SizeOfStackCommit exceeds the address space\n"));
 
            ImageSectionObject->ImageInformation.CommittedStackSize = (ULONG_PTR) pioh64OptHeader->SizeOfStackCommit;
        }
 
        if (RTL_CONTAINS_FIELD(pioh64OptHeader, cbOptHeaderSize, Subsystem))
        {
            ImageSectionObject->ImageInformation.SubSystemType = pioh64OptHeader->Subsystem;
 
            if (RTL_CONTAINS_FIELD(pioh64OptHeader, cbOptHeaderSize, MinorSubsystemVersion) &&
                    RTL_CONTAINS_FIELD(pioh64OptHeader, cbOptHeaderSize, MajorSubsystemVersion))
            {
                ImageSectionObject->ImageInformation.SubSystemMinorVersion = pioh64OptHeader->MinorSubsystemVersion;
                ImageSectionObject->ImageInformation.SubSystemMajorVersion = pioh64OptHeader->MajorSubsystemVersion;
            }
        }
 
        if (RTL_CONTAINS_FIELD(pioh64OptHeader, cbOptHeaderSize, AddressOfEntryPoint))
        {
            ImageSectionObject->ImageInformation.TransferAddress = (PVOID) (ImageBase +
                    pioh64OptHeader->AddressOfEntryPoint);
        }
 
        if (RTL_CONTAINS_FIELD(pioh64OptHeader, cbOptHeaderSize, SizeOfCode))
            ImageSectionObject->ImageInformation.ImageContainsCode = pioh64OptHeader->SizeOfCode != 0;
        else
            ImageSectionObject->ImageInformation.ImageContainsCode = TRUE;
 
        if (RTL_CONTAINS_FIELD(pioh64OptHeader, cbOptHeaderSize, AddressOfEntryPoint))
        {
            if (pioh64OptHeader->AddressOfEntryPoint == 0)
            {
                ImageSectionObject->ImageInformation.ImageContainsCode = FALSE;
            }
        }
 
        if (RTL_CONTAINS_FIELD(pioh64OptHeader, cbOptHeaderSize, LoaderFlags))
            ImageSectionObject->ImageInformation.LoaderFlags = pioh64OptHeader->LoaderFlags;
 
        if (RTL_CONTAINS_FIELD(pioh64OptHeader, cbOptHeaderSize, DllCharacteristics))
            ImageSectionObject->ImageInformation.DllCharacteristics = pioh64OptHeader->DllCharacteristics;
 
        break;
    }
#endif // _WIN64
    }
 
    /* [1], section 3.4.2 */
    if((ULONG_PTR)ImageBase % 0x10000)
        DIE(("ImageBase is not aligned on a 64KB boundary"));
 
    ImageSectionObject->ImageInformation.ImageCharacteristics = pinhNtHeader->FileHeader.Characteristics;
    ImageSectionObject->ImageInformation.Machine = pinhNtHeader->FileHeader.Machine;
    ImageSectionObject->ImageInformation.GpValue = 0;
    ImageSectionObject->ImageInformation.ZeroBits = 0;
    ImageSectionObject->BasedAddress = (PVOID)ImageBase;
 
    /* SECTION HEADERS */
    nStatus = STATUS_INVALID_IMAGE_FORMAT;
 
    /* see [1], section 3.3 */
    if(pinhNtHeader->FileHeader.NumberOfSections > 96)
        DIE(("Too many sections, NumberOfSections is %u\n", pinhNtHeader->FileHeader.NumberOfSections));
 
    /*
     * the additional segment is for the file's headers. They need to be present for
     * the benefit of the dynamic loader (to locate exports, defaults for thread
     * parameters, resources, etc.)
     */
    ImageSectionObject->NrSegments = pinhNtHeader->FileHeader.NumberOfSections + 1;
 
    /* file offset for the section headers */
    if(!Intsafe_AddULong32(&cbSectionHeadersOffset, pidhDosHeader->e_lfanew, FIELD_OFFSET(IMAGE_NT_HEADERS32, OptionalHeader)))
        DIE(("Offset overflow\n"));
 
    if(!Intsafe_AddULong32(&cbSectionHeadersOffset, cbSectionHeadersOffset, pinhNtHeader->FileHeader.SizeOfOptionalHeader))
        DIE(("Offset overflow\n"));
 
    /* size of the section headers */
    ASSERT(Intsafe_CanMulULong32(pinhNtHeader->FileHeader.NumberOfSections, sizeof(IMAGE_SECTION_HEADER)));
    cbSectionHeadersSize = pinhNtHeader->FileHeader.NumberOfSections * sizeof(IMAGE_SECTION_HEADER);
 
    if(!Intsafe_AddULong32(&cbSectionHeadersOffsetSize, cbSectionHeadersOffset, cbSectionHeadersSize))
        DIE(("Section headers too large\n"));
 
    /* size of the executable's headers */
    if(RTL_CONTAINS_FIELD(piohOptHeader, cbOptHeaderSize, SizeOfHeaders))
    {
//        if(!IsAligned(piohOptHeader->SizeOfHeaders, nFileAlignment))
//            DIE(("SizeOfHeaders is not aligned\n"));
 
        if(cbSectionHeadersSize > piohOptHeader->SizeOfHeaders)
            DIE(("The section headers overflow SizeOfHeaders\n"));
 
        cbHeadersSize = piohOptHeader->SizeOfHeaders;
    }
    else if(!AlignUp(&cbHeadersSize, cbSectionHeadersOffsetSize, nFileAlignment))
        DIE(("Overflow aligning the size of headers\n"));
 
    if(pBuffer)
    {
        ExFreePool(pBuffer);
        pBuffer = NULL;
    }
    /* WARNING: pinhNtHeader IS NO LONGER USABLE */
    /* WARNING: piohOptHeader IS NO LONGER USABLE */
    /* WARNING: pioh64OptHeader IS NO LONGER USABLE */
 
    if(FileHeaderSize < cbSectionHeadersOffsetSize)
        pishSectionHeaders = NULL;
    else
    {
        /*
         * we already know that Intsafe_CanOffsetPointer(FileHeader, FileHeaderSize),
         * and FileHeaderSize >= cbSectionHeadersOffsetSize, so this holds true too
         */
        ASSERT(Intsafe_CanOffsetPointer(FileHeader, cbSectionHeadersOffset));
        pishSectionHeaders = (PVOID)((UINT_PTR)FileHeader + cbSectionHeadersOffset);
    }
 
    /*
     * the buffer doesn't contain the section headers, or the alignment is wrong:
     * read the headers from the file
     */
    if(FileHeaderSize < cbSectionHeadersOffsetSize ||
            (UINT_PTR)pishSectionHeaders % TYPE_ALIGNMENT(IMAGE_SECTION_HEADER) != 0)
    {
        PVOID pData;
        ULONG cbReadSize;
 
        lnOffset.QuadPart = cbSectionHeadersOffset;
 
        /* read the header from the file */
        nStatus = ReadFileCb(File, &lnOffset, cbSectionHeadersSize, &pData, &pBuffer, &cbReadSize);
 
        if(!NT_SUCCESS(nStatus))
            DIE(("ReadFile failed with status %08X\n", nStatus));
 
        ASSERT(pData);
        ASSERT(pBuffer);
        ASSERT(cbReadSize > 0);
 
        nStatus = STATUS_INVALID_IMAGE_FORMAT;
 
        /* the buffer doesn't contain all the section headers */
        if(cbReadSize < cbSectionHeadersSize)
            DIE(("The file doesn't contain all of the section headers\n"));
 
        pishSectionHeaders = pData;
 
        /* object still not aligned: copy it to the beginning of the buffer */
        if((UINT_PTR)pishSectionHeaders % TYPE_ALIGNMENT(IMAGE_SECTION_HEADER) != 0)
        {
            ASSERT((UINT_PTR)pBuffer % TYPE_ALIGNMENT(IMAGE_SECTION_HEADER) == 0);
            RtlMoveMemory(pBuffer, pData, cbReadSize);
            pishSectionHeaders = pBuffer;
        }
    }
 
    /* SEGMENTS */
    /* allocate the segments */
    nStatus = STATUS_INSUFFICIENT_RESOURCES;
    ImageSectionObject->Segments = AllocateSegmentsCb(ImageSectionObject->NrSegments);
 
    if(ImageSectionObject->Segments == NULL)
        DIE(("AllocateSegments failed\n"));
 
    /* initialize the headers segment */
    pssSegments = ImageSectionObject->Segments;
 
//  ASSERT(IsAligned(cbHeadersSize, nFileAlignment));
 
    if(!AlignUp(&nFileSizeOfHeaders, cbHeadersSize, nFileAlignment))
        DIE(("Cannot align the size of the section headers\n"));
 
    nPrevVirtualEndOfSegment = ALIGN_UP_BY(cbHeadersSize, nSectionAlignment);
    if (nPrevVirtualEndOfSegment < cbHeadersSize)
        DIE(("Cannot align the size of the section headers\n"));
 
    pssSegments[0].Image.FileOffset = 0;
    pssSegments[0].Protection = PAGE_READONLY;
    pssSegments[0].Length.QuadPart = nPrevVirtualEndOfSegment;
    pssSegments[0].RawLength.QuadPart = nFileSizeOfHeaders;
    pssSegments[0].Image.VirtualAddress = 0;
    pssSegments[0].Image.Characteristics = 0;
    pssSegments[0].WriteCopy = TRUE;
 
    /* skip the headers segment */
    ++ pssSegments;
 
    nStatus = STATUS_INVALID_IMAGE_FORMAT;
 
    ASSERT(ImageSectionObject->RefCount > 0);
 
    /* convert the executable sections into segments. See also [1], section 4 */
    for(i = 0; i < ImageSectionObject->NrSegments - 1; ++ i)
    {
        ULONG nCharacteristics;
 
        /* validate the alignment */
        if(!IsAligned(pishSectionHeaders[i].VirtualAddress, nSectionAlignment))
            DIE(("Image.VirtualAddress[%u] is not aligned\n", i));
 
        /* sections must be contiguous, ordered by base address and non-overlapping */
        if(pishSectionHeaders[i].VirtualAddress != nPrevVirtualEndOfSegment)
            DIE(("Memory gap between section %u and the previous\n", i));
 
        /* ignore explicit BSS sections */
        if(pishSectionHeaders[i].PointerToRawData != 0 && pishSectionHeaders[i].SizeOfRawData != 0)
        {
            /* validate the alignment */
#if 0
            /* Yes, this should be a multiple of FileAlignment, but there's
             * stuff out there that isn't. We can cope with that
             */
            if(!IsAligned(pishSectionHeaders[i].SizeOfRawData, nFileAlignment))
                DIE(("SizeOfRawData[%u] is not aligned\n", i));
#endif
 
//            if(!IsAligned(pishSectionHeaders[i].PointerToRawData, nFileAlignment))
//                DIE(("PointerToRawData[%u] is not aligned\n", i));
 
            if(!Intsafe_CanAddULong32(pishSectionHeaders[i].PointerToRawData, pishSectionHeaders[i].SizeOfRawData))
                DIE(("SizeOfRawData[%u] too large\n", i));
 
            /* conversion */
            pssSegments[i].Image.FileOffset = pishSectionHeaders[i].PointerToRawData;
            pssSegments[i].RawLength.QuadPart = pishSectionHeaders[i].SizeOfRawData;
        }
        else
        {
            /* FIXME: Should reset PointerToRawData to 0 in the image mapping */
            ASSERT(pssSegments[i].Image.FileOffset == 0);
            ASSERT(pssSegments[i].RawLength.QuadPart == 0);
        }
 
        ASSERT(Intsafe_CanAddLong64(pssSegments[i].Image.FileOffset, pssSegments[i].RawLength.QuadPart));
 
        nCharacteristics = pishSectionHeaders[i].Characteristics;
 
        /* no explicit protection */
        if((nCharacteristics & (IMAGE_SCN_MEM_EXECUTE | IMAGE_SCN_MEM_READ | IMAGE_SCN_MEM_WRITE)) == 0)
        {
            if(nCharacteristics & IMAGE_SCN_CNT_CODE)
                nCharacteristics |= IMAGE_SCN_MEM_EXECUTE | IMAGE_SCN_MEM_READ;
 
            if(nCharacteristics & IMAGE_SCN_CNT_INITIALIZED_DATA)
                nCharacteristics |= IMAGE_SCN_MEM_READ | IMAGE_SCN_MEM_WRITE;
 
            if(nCharacteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA)
                nCharacteristics |= IMAGE_SCN_MEM_READ | IMAGE_SCN_MEM_WRITE;
        }
 
        /* see table above */
        pssSegments[i].Protection = SectionCharacteristicsToProtect[nCharacteristics >> 28];
        pssSegments[i].WriteCopy = !(nCharacteristics & IMAGE_SCN_MEM_SHARED);
 
        if(pishSectionHeaders[i].Misc.VirtualSize == 0)
            pssSegments[i].Length.QuadPart = pishSectionHeaders[i].SizeOfRawData;
        else
            pssSegments[i].Length.QuadPart = pishSectionHeaders[i].Misc.VirtualSize;
 
        AlignedLength = ALIGN_UP_BY(pssSegments[i].Length.LowPart, nSectionAlignment);
        if(AlignedLength < pssSegments[i].Length.LowPart)
            DIE(("Cannot align the virtual size of section %u\n", i));
 
        pssSegments[i].Length.LowPart = AlignedLength;
 
        if(pssSegments[i].Length.QuadPart == 0)
            DIE(("Virtual size of section %u is null\n", i));
 
        pssSegments[i].Image.VirtualAddress = pishSectionHeaders[i].VirtualAddress;
        pssSegments[i].Image.Characteristics = pishSectionHeaders[i].Characteristics;
 
        /* ensure the memory image is no larger than 4GB */
        nPrevVirtualEndOfSegment = (ULONG_PTR)(pssSegments[i].Image.VirtualAddress + pssSegments[i].Length.QuadPart);
        if (nPrevVirtualEndOfSegment < pssSegments[i].Image.VirtualAddress)
            DIE(("The image is too large\n"));
    }
 
    if(nSectionAlignment >= PAGE_SIZE)
        *Flags |= EXEFMT_LOAD_ASSUME_SEGMENTS_PAGE_ALIGNED;
 
    /* Success */
    nStatus = STATUS_SUCCESS;// STATUS_ROS_EXEFMT_LOADED_FORMAT | EXEFMT_LOADED_PE32;
 
l_Return:
    if(pBuffer)
        ExFreePool(pBuffer);
 
    return nStatus;
}

Variable Documentation

Entry

_Inout_ PLIST_ENTRY Entry = MmGetPageEntrySectionSegment(Segment, Offset)

Definition at line 5042 of file section.c.

ExeFmtpLoaders

PEXEFMT_LOADER ExeFmtpLoaders[]

static

Initial value:

=
{
    PeFmtCreateSection,
 
 
 
}

Definition at line 2579 of file section.c.

Referenced by ExeFmtpCreateImageSection().

FALSE

return FALSE

Definition at line 5197 of file section.c.

ForceDirty

PLARGE_INTEGER BOOLEAN ForceDirty

Definition at line 5029 of file section.c.

MmMakeFileAccess

ACCESS_MASK MmMakeFileAccess[8]

extern

Definition at line 32 of file section.c.

Referenced by MmCreateArm3Section(), and MmCreateSection().

MmpSectionMapping

GENERIC_MAPPING MmpSectionMapping

static

Initial value:

=
{
    STANDARD_RIGHTS_READ | SECTION_MAP_READ | SECTION_QUERY,
    STANDARD_RIGHTS_WRITE | SECTION_MAP_WRITE,
    STANDARD_RIGHTS_EXECUTE | SECTION_MAP_EXECUTE,
    SECTION_ALL_ACCESS
}

Definition at line 223 of file section.c.

Referenced by MmInitSectionImplementation().

MmSectionObjectType

POBJECT_TYPE MmSectionObjectType = NULL

Definition at line 194 of file section.c.

Referenced by ExpInitNls(), MmCreateArm3Section(), MmCreateDataFileSection(), MmCreateImageSection(), MmCreatePhysicalMemorySection(), MmInitSectionImplementation(), MmLoadSystemImage(), NtExtendSection(), NtMapViewOfSection(), NtOpenSection(), NtQuerySection(), NtSecureConnectPort(), ObpLookupObjectName(), PsLocateSystemDll(), PspCreateProcess(), and TestObjectTypes().

MmSession

MMSESSION MmSession

extern

Definition at line 107 of file section.c.

Referenced by MiInitializeSystemSpaceMap(), MiInsertInSystemSpace(), MiMapViewInSystemSpace(), MmMapViewInSystemSpaceEx(), and MmUnmapViewInSystemSpace().

MmSubsectionBase

ULONG_PTR MmSubsectionBase

Definition at line 196 of file section.c.

Referenced by MI_MAKE_SUBSECTION_PTE(), and MiInitMachineDependent().

MmWaitPageEvent

KEVENT MmWaitPageEvent

Definition at line 66 of file section.c.

Referenced by MmInitSystem().

Offset

PLARGE_INTEGER Offset

Definition at line 5028 of file section.c.

Referenced by ExeFmtpCreateImageSection(), ExeFmtpReadFile(), MiPurgeImageSegment(), MmAccessFaultSectionView(), MmAlterViewAttributes(), MmFlushSegment(), MmFreeSectionPage(), MmNotPresentFaultSectionView(), and MmpFreePageFileSegment().

Page

PFN_NUMBER Page

Definition at line 5034 of file section.c.

Referenced by FreeSegmentPage(), if(), MiWritePage(), MmAlterViewAttributes(), MmFreeSectionPage(), MmNotPresentFaultSectionView(), MmpFreePageFileSegment(), and MmUnsharePageEntrySectionSegment().

PageOut

PLARGE_INTEGER BOOLEAN BOOLEAN PageOut

Initial value:

{
    ULONG_PTR Entry

Definition at line 5030 of file section.c.

Referenced by MmUnsharePageEntrySectionSegment().

SectionCharacteristicsToProtect

ULONG SectionCharacteristicsToProtect[16]

static

Initial value:

=
{
    PAGE_NOACCESS,          
    PAGE_NOACCESS,          
    PAGE_EXECUTE,           
    PAGE_EXECUTE,           
    PAGE_READONLY,          
    PAGE_READONLY,          
    PAGE_EXECUTE_READ,      
    PAGE_EXECUTE_READ,      
    
    PAGE_READWRITE,         
    PAGE_READWRITE,         
    PAGE_EXECUTE_READWRITE, 
    PAGE_EXECUTE_READWRITE, 
    PAGE_READWRITE,         
    PAGE_READWRITE,         
    PAGE_EXECUTE_READWRITE, 
    PAGE_EXECUTE_READWRITE, 
}

Definition at line 198 of file section.c.

Referenced by PeFmtCreateSection().

Status

NTSTATUS Status

Definition at line 5033 of file section.c.

TinyTime

LARGE_INTEGER TinyTime = {{-1L, -1L}}

static

Definition at line 63 of file section.c.

Referenced by MiGrabDataSection(), MmAlterViewAttributes(), MmCreateDataFileSection(), MmCreateImageSection(), MmFlushImageSection(), MmFreeSectionPage(), MmMakePagesDirty(), MmMakeSegmentResident(), MmNotPresentFaultSectionView(), MmPurgeSegment(), and MmRequestPageMemoryConsumer().