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))
ACCESS_MASK NTAPI	MiArm3GetCorrectFileAccessMask (IN ACCESS_MASK SectionPageProtection)
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 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]
ULONG	MmMakeFileAccess []
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 57 of file section.c.

NDEBUG

#define NDEBUG

Definition at line 50 of file section.c.

Function Documentation

_MmLockSectionSegment()

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

Definition at line 71 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 80 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 990 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

(

Segment->

Locked

)

Referenced by _MmUnlockSectionSegment(), _When_(), ExeFmtpCreateImageSection(), ExeFmtpReadFile(), FreeSegmentPage(), ImageSectionObjectFromSegment(), MiAddMappedPtes(), MiCheckControlArea(), MiCheckPurgeAndUpMapCount(), MiCopyFromUserPage(), MiCreateDataFileMap(), MiCreatePagingFileMap(), MiDeleteARM3Section(), MiFillSystemPageDirectory(), MiFlushTbAndCapture(), MiGetFileObjectForSectionAddress(), MiGetFileObjectForVad(), MiGrabDataSection(), MiInitializeSystemSpaceMap(), MiInsertInSystemSpace(), MiLocateSubsection(), MiMakeProtectionMask(), MiMapViewInSystemSpace(), MiMapViewOfDataSection(), MiPurgeImageSegment(), MiRemoveMappedPtes(), MiRemoveMappedView(), MiRosUnmapViewOfSection(), MiSegmentDelete(), MiSessionCommitPageTables(), MiSetControlAreaSymbolsLoaded(), MiSetProtectionOnSection(), MiSubsectionConsistent(), MiUnmapViewOfSection(), MmAccessFaultSectionView(), MmAlterViewAttributes(), MmArePagesResident(), MmCommitSessionMappedView(), MmCreateArm3Section(), MmCreateDataFileSection(), MmCreateImageSection(), MmFlushImageSection(), MmFlushSegment(), MmFreeSectionPage(), MmGetFileObjectForSection(), MmGetImageInformation(), MmInitSectionImplementation(), MmMakeDataSectionResident(), MmMakePagesDirty(), MmMakeSegmentResident(), MmMapViewInSessionSpace(), MmMapViewInSystemSpaceEx(), MmMapViewOfArm3Section(), MmMapViewOfSection(), MmMapViewOfSegment(), MmNotPresentFaultSectionView(), MmpDeleteSection(), MmProtectSectionView(), MmPurgeSegment(), MmspAssertSegmentsNoOverlap(), MmspAssertSegmentsPageAligned(), MmspAssertSegmentsSorted(), MmspCheckSegmentBounds(), MmspPageAlignSegments(), MmUnmapViewInSessionSpace(), MmUnsharePageEntrySectionSegment(), NtQuerySection(), and PeFmtCreateSection().

ASSERT() [2/2]

ASSERT

(

(Offset->QuadPart % PAGE_SIZE)

= =0

)

C_ASSERT() [1/14]

C_ASSERT

(

EXEFMT_LOAD_HEADER_SIZE >=

sizeofIMAGE_DOS_HEADER

)

C_ASSERT() [2/14]

C_ASSERT

(

sizeof(IMAGE_NT_HEADERS32)<=sizeof(IMAGE_NT_HEADERS64)

)

C_ASSERT() [3/14]

C_ASSERT

(

TYPE_ALIGNMENT(IMAGE_NT_HEADERS32)

= =TYPE_ALIGNMENT(IMAGE_NT_HEADERS64)

)

C_ASSERT() [4/14]

C_ASSERT

(

RTL_SIZEOF_THROUGH_FIELD(IMAGE_NT_HEADERS32, FileHeader)

= =RTL_SIZEOF_THROUGH_FIELD(IMAGE_NT_HEADERS64, FileHeader)

)

C_ASSERT() [5/14]

C_ASSERT

(

FIELD_OFFSET(IMAGE_NT_HEADERS32, OptionalHeader)

= =FIELD_OFFSET(IMAGE_NT_HEADERS64, OptionalHeader)

)

C_ASSERT() [6/14]

C_ASSERT

(

PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, Magic)

)

C_ASSERT() [7/14]

C_ASSERT

(

PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, SectionAlignment)

)

C_ASSERT() [8/14]

C_ASSERT

(

PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, FileAlignment)

)

C_ASSERT() [9/14]

C_ASSERT

(

PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, Subsystem)

)

C_ASSERT() [10/14]

C_ASSERT

(

PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, MinorSubsystemVersion)

)

C_ASSERT() [11/14]

C_ASSERT

(

PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, MajorSubsystemVersion)

)

C_ASSERT() [12/14]

C_ASSERT

(

PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, AddressOfEntryPoint)

)

C_ASSERT() [13/14]

C_ASSERT

(

PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, SizeOfCode)

)

C_ASSERT() [14/14]

C_ASSERT

(

PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, SizeOfHeaders)

)

DPRINT()

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

Referenced by MiMapViewOfDataSection(), MiQueryMemorySectionName(), MiRemoveMappedPtes(), MiRosUnmapViewInSystemSpace(), MiRosUnmapViewOfSection(), MiSegmentDelete(), MmAccessFaultSectionView(), MmCanFileBeTruncated(), MmFlushImageSection(), MmGetFileNameForAddress(), MmInitSectionImplementation(), MmMakePagesDirty(), MmMapViewInSystemSpaceEx(), MmMapViewOfSection(), MmNotPresentFaultSectionView(), MmpCloseSection(), MmpDeleteSection(), and NtMapViewOfSection().

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 2557 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 2991 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 2577 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 962 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

(

Entry

= = 0

)

Definition at line 4933 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))
        {
            /* We have to write it back to the file. Tell the FS driver who we are */
            if (PageOut)
                IoSetTopLevelIrp((PIRP)FSRTL_MOD_WRITE_TOP_LEVEL_IRP);

            /* Go ahead and write the page */
            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);
        }
        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);
    }

Referenced by MmExtendSection(), MmMapViewInSystemSpaceEx(), MmpDeleteSection(), NtQuerySection(), and PeFmtCreateSection().

if() [2/2]

if

(

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

PageOut

)

Definition at line 5030 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;
    }

ImageSectionObjectFromSegment()

PMM_IMAGE_SECTION_OBJECT ImageSectionObjectFromSegment

(

PMM_SECTION_SEGMENT

Segment

)

Definition at line 121 of file section.c.

{
    ASSERT((Segment->SegFlags & MM_DATAFILE_SEGMENT) == 0);

    return CONTAINING_RECORD(Segment->ReferenceCount, MM_IMAGE_SECTION_OBJECT, RefCount);
}

Referenced by MiRosUnmapViewOfSection().

MiArm3GetCorrectFileAccessMask()

ACCESS_MASK NTAPI MiArm3GetCorrectFileAccessMask

(

IN ACCESS_MASK

SectionPageProtection

)

Definition at line 140 of file section.c.

{
    ULONG ProtectionMask;

    /* Calculate the protection mask and make sure it's valid */
    ProtectionMask = MiMakeProtectionMask(SectionPageProtection);
    if (ProtectionMask == MM_INVALID_PROTECTION)
    {
        DPRINT1("Invalid protection mask\n");
        return STATUS_INVALID_PAGE_PROTECTION;
    }

    /* Now convert it to the required file access */
    return MmMakeFileAccess[ProtectionMask & 0x7];
}

MiCopyFromUserPage()

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

static

Definition at line 1172 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 91 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 4200 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 4447 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 3556 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 ? &Process->Vm : MmGetKernelAddressSpace();

    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
    {
        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));
        }
    }

    /* 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 240 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 1892 of file section.c.

{
    PMM_SECTION_SEGMENT Segment;
    PFN_NUMBER OldPage;
    PFN_NUMBER NewPage;
    PVOID PAddress;
    LARGE_INTEGER Offset;
    PMM_REGION Region;
    ULONG_PTR Entry;
    PEPROCESS Process = MmGetAddressSpaceOwner(AddressSpace);
    BOOLEAN Cow = FALSE;
    ULONG NewProtect;

    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
     */
    if (!NT_SUCCESS(MmRequestPageMemoryConsumer(MC_USER, TRUE, &NewPage)))
    {
        KeBugCheck(MEMORY_MANAGEMENT);
    }

    /*
     * 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);
    MmDeleteVirtualMapping(Process, PAddress, NULL, NULL);
    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 1440 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);
                YieldProcessor();
                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 4665 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 PLARGE_INTEGER	NewFileSize
	)

Definition at line 4152 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
    {
        /* 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
    }
    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 2486 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) 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 2294 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 3144 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 2170 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 4510 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 5124 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 4246 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(),