objtype.c

Go to the documentation of this file.

/*
 * PROJECT:         ReactOS Kernel
 * LICENSE:         GPL-2.0-or-later (https://spdx.org/licenses/GPL-2.0-or-later)
 * PURPOSE:         Security object type list support routines
 * COPYRIGHT:       Copyright Timo Kreuzer <timo.kreuzer@reactos.org>
 */
 
/* INCLUDES *******************************************************************/
 
#include <ntoskrnl.h>
#define NDEBUG
#include <debug.h>
 
/* PRIVATE FUNCTIONS ***********************************************************/
 
NTSTATUS
SeCaptureObjectTypeList(
    _In_reads_opt_(ObjectTypeListLength) POBJECT_TYPE_LIST ObjectTypeList,
    _In_ ULONG ObjectTypeListLength,
    _In_ KPROCESSOR_MODE PreviousMode,
    _Out_ POBJECT_TYPE_LIST *CapturedObjectTypeList)
{
    SIZE_T Size;
 
    if (PreviousMode == KernelMode)
    {
        return STATUS_NOT_IMPLEMENTED;
    }
 
    if (ObjectTypeListLength == 0)
    {
        *CapturedObjectTypeList = NULL;
        return STATUS_SUCCESS;
    }
 
    if (ObjectTypeList == NULL)
    {
        return STATUS_INVALID_PARAMETER;
    }
 
    /* Calculate the list size and check for integer overflow */
    Size = ObjectTypeListLength * sizeof(OBJECT_TYPE_LIST);
    if (Size == 0)
    {
        return STATUS_INVALID_PARAMETER;
    }
 
    /* Allocate a new list */
    *CapturedObjectTypeList = ExAllocatePoolWithTag(PagedPool, Size, TAG_SEPA);
    if (*CapturedObjectTypeList == NULL)
    {
        return STATUS_INSUFFICIENT_RESOURCES;
    }
 
    _SEH2_TRY
    {
        ProbeForRead(ObjectTypeList, Size, sizeof(ULONG));
        RtlCopyMemory(*CapturedObjectTypeList, ObjectTypeList, Size);
    }
    _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
    {
        ExFreePoolWithTag(*CapturedObjectTypeList, TAG_SEPA);
        *CapturedObjectTypeList = NULL;
        _SEH2_YIELD(return _SEH2_GetExceptionCode());
    }
    _SEH2_END;
 
    return STATUS_SUCCESS;
}
 
VOID
SeReleaseObjectTypeList(
    _In_  _Post_invalid_ POBJECT_TYPE_LIST CapturedObjectTypeList,
    _In_ KPROCESSOR_MODE PreviousMode)
{
    if ((PreviousMode != KernelMode) && (CapturedObjectTypeList != NULL))
        ExFreePoolWithTag(CapturedObjectTypeList, TAG_SEPA);
}
 
/* EOF */