89 lines
2.2 KiB
C++
89 lines
2.2 KiB
C++
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/*++
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Copyright (c) 2001-2002 Microsoft Corporation
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Module Name:
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DuplicateHandleFix.cpp
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Abstract:
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DuplicateHandle was changed to always NULL the destination handle, even if
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errors were generated. THis shim ensures that the DestinationHandle is
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not modified if the duplication was not successful.
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History:
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10/11/2001 robkenny Created.
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02/20/2002 mnikkel Added check for null lpTargetHandle
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--*/
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#include "precomp.h"
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IMPLEMENT_SHIM_BEGIN(DuplicateHandleFix)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(DuplicateHandle)
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APIHOOK_ENUM_END
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typedef BOOL (WINAPI *_pfn_DuplicateHandle)(HANDLE hSourceProcessHandle, HANDLE hSourceHandle, HANDLE hTargetProcessHandle, LPHANDLE lpTargetHandle, DWORD dwDesiredAccess, BOOL bInheritHandle, DWORD dwOptions );
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/*++
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Don't allow DestinationHandle to change of DuplicateHandle generates an error.
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--*/
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BOOL
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APIHOOK(DuplicateHandle)(
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HANDLE hSourceProcessHandle, // handle to source process
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HANDLE hSourceHandle, // handle to duplicate
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HANDLE hTargetProcessHandle, // handle to target process
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LPHANDLE lpTargetHandle, // duplicate handle
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DWORD dwDesiredAccess, // requested access
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BOOL bInheritHandle, // handle inheritance option
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DWORD dwOptions // optional actions
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)
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{
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HANDLE origHandle = NULL;
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// Save the original value
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if (lpTargetHandle)
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{
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origHandle = *lpTargetHandle;
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}
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BOOL bSuccess = ORIGINAL_API(DuplicateHandle)(hSourceProcessHandle,
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hSourceHandle, hTargetProcessHandle, lpTargetHandle, dwDesiredAccess,
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bInheritHandle, dwOptions);
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if (!bSuccess && lpTargetHandle)
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{
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//
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// DuplicateHandle has set *lpTargetHandle to NULL, revert to it's previous value.
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//
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*lpTargetHandle = origHandle;
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LOGN(eDbgLevelError, "DuplicateHandle failed, reverting *lpTargetHandle to previous value");
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}
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return bSuccess;
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}
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/*++
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Register hooked functions
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--*/
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HOOK_BEGIN
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APIHOOK_ENTRY(KERNEL32.DLL, DuplicateHandle)
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HOOK_END
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IMPLEMENT_SHIM_END
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