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104 lines
2.5 KiB
104 lines
2.5 KiB
/*++
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Copyright (c) 2001 Microsoft Corporation
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Module Name:
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RemoveOverlappedFlagFromCreateFile.cpp
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Abstract:
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This modified version of kernel32!CreateFile* prevents an app from using
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the FILE_FLAG_OVERLAPPED flag if the app doesn't handle it correctly.
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Notes:
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This is a general shim.
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History:
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06/22/2001 linstev Created
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--*/
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#include "precomp.h"
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IMPLEMENT_SHIM_BEGIN(RemoveOverlappedFlagFromCreateFile)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(CreateFileA)
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APIHOOK_ENUM_ENTRY(CreateFileW)
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APIHOOK_ENUM_END
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/*++
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Take out FILE_FLAG_OVERLAPPED if we are on a drive
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--*/
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HANDLE
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APIHOOK(CreateFileA)(
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LPSTR lpFileName,
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DWORD dwDesiredAccess,
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DWORD dwShareMode,
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LPSECURITY_ATTRIBUTES lpSecurityAttributes,
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DWORD dwCreationDisposition,
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DWORD dwFlagsAndAttributes,
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HANDLE hTemplateFile
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)
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{
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if ((dwFlagsAndAttributes & FILE_FLAG_OVERLAPPED) &&
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(GetDriveTypeFromFileNameA(lpFileName) != DRIVE_UNKNOWN))
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{
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dwFlagsAndAttributes &= ~FILE_FLAG_OVERLAPPED;
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LOGN(eDbgLevelInfo, "[CreateFileA] \"%s\": removed OVERLAPPED flag", lpFileName);
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}
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return ORIGINAL_API(CreateFileA)(lpFileName, dwDesiredAccess, dwShareMode,
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lpSecurityAttributes, dwCreationDisposition, dwFlagsAndAttributes,
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hTemplateFile);
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}
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/*++
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Take out FILE_FLAG_OVERLAPPED if we are on a drive
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--*/
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HANDLE
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APIHOOK(CreateFileW)(
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LPWSTR lpFileName,
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DWORD dwDesiredAccess,
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DWORD dwShareMode,
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LPSECURITY_ATTRIBUTES lpSecurityAttributes,
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DWORD dwCreationDisposition,
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DWORD dwFlagsAndAttributes,
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HANDLE hTemplateFile
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)
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{
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if ((dwFlagsAndAttributes & FILE_FLAG_OVERLAPPED) &&
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(GetDriveTypeFromFileNameW(lpFileName) != DRIVE_UNKNOWN))
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{
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dwFlagsAndAttributes &= ~FILE_FLAG_OVERLAPPED;
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LOGN(eDbgLevelInfo, "[CreateFileW] \"%S\": removed OVERLAPPED flag", lpFileName);
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}
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return ORIGINAL_API(CreateFileW)(lpFileName, dwDesiredAccess, dwShareMode,
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lpSecurityAttributes, dwCreationDisposition, dwFlagsAndAttributes,
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hTemplateFile);
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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, CreateFileA)
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APIHOOK_ENTRY(KERNEL32.DLL, CreateFileW)
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HOOK_END
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IMPLEMENT_SHIM_END
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