74 lines
1 KiB
C
74 lines
1 KiB
C
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/*++
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Copyright (c) 1998 Microsoft Corporation
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Module Name:
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vdmtib.c
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Abstract:
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This module contains routines that provide secure access to
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the vdmtib from user-mode or kernel-mode object
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Author:
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Vadim Bluvshteyn (vadimb) Jul-28-1998
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Revision History:
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--*/
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#include "vdmp.h"
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE, VdmpGetVdmTib)
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#endif
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NTSTATUS
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VdmpGetVdmTib(
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OUT PVDM_TIB *ppVdmTib
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)
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/*++
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Routine Description:
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Arguments:
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Return Value:
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NTStatus reflecting results of the probe made to the user-mode
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vdmtib memory
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--*/
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{
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NTSTATUS Status;
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PVDM_TIB VdmTib;
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PAGED_CODE();
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try {
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VdmTib = NtCurrentTeb()->Vdm;
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//
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// Make sure it is a valid VdmTib
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//
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ProbeForWrite(VdmTib, sizeof(VDM_TIB), sizeof(UCHAR));
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if (VdmTib->Size != sizeof(VDM_TIB)) {
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return STATUS_UNSUCCESSFUL;
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}
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} except(ExSystemExceptionFilter()) {
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return GetExceptionCode();
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}
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*ppVdmTib = VdmTib;
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return STATUS_SUCCESS;
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}
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