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161 lines
3.4 KiB
161 lines
3.4 KiB
/*++
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Copyright (c) 2000 Microsoft Corporation
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Module Name:
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NFLFever2000.cpp
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Abstract:
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The app reads past the end of files that it's copied into memory.
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The shim allocates additional memory for it
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Note we included an in-memory patch for Win2k. On Whistler it's not
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required, the rest of the shim does the work.
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Notes:
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This is an app specific shim.
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History:
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01/11/2000 linstev Created
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10/03/2000 maonis Modified (the acm stuff is now in a general purpose shim)
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--*/
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#include "precomp.h"
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IMPLEMENT_SHIM_BEGIN(NFLFever2000)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(GetFileSize)
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APIHOOK_ENUM_ENTRY(RtlAllocateHeap)
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APIHOOK_ENUM_ENTRY(mmioSetInfo)
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APIHOOK_ENUM_END
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DWORD g_dwFileSize = -1;
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BOOL g_bPatched = FALSE;
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/*++
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Hook GetFileSize to make sure we get the correct heap allocations.
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--*/
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DWORD
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APIHOOK(GetFileSize)(
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HANDLE hFile,
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LPDWORD lpFileSizeHigh
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)
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{
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DWORD dwRet = ORIGINAL_API(GetFileSize)(hFile, lpFileSizeHigh);
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g_dwFileSize = dwRet;
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PBYTE p;
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ULONG oldProtect;
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if (!g_bPatched) {
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p = (PBYTE)0x10995d0;
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if (!IsBadReadPtr(p, 1) && (*p == 0x8b)) {
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VirtualProtect(p, 3, PAGE_READWRITE, &oldProtect);
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*p = 0xc2;
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*(p + 1) = 0x8;
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*(p + 2) = 0x0;
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VirtualProtect(p, 3, oldProtect, &oldProtect);
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g_bPatched = TRUE;
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}
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}
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return dwRet;
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}
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/*++
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Increase the heap allocation size.
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--*/
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PVOID
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APIHOOK(RtlAllocateHeap) (
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PVOID HeapHandle,
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ULONG Flags,
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SIZE_T Size
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)
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{
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if (Size == g_dwFileSize) {
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DPFN( eDbgLevelError, "Adjusted heap allocation from %d to %d\n", Size, Size+0x1000);
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Size += 0x1000;
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}
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return ORIGINAL_API(RtlAllocateHeap)(HeapHandle, Flags, Size);
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}
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/*++
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Make the buffer read/write.
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--*/
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MMRESULT
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APIHOOK(mmioSetInfo)(
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HMMIO hmmio,
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LPMMIOINFO lpmmioinfo,
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UINT wFlags
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)
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{
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//
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// BUGBUG: Not needed on XP, but still required on Win2k
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// This fix causes sound to skip, see #304678.
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//
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// Win2k used to check if the buffer could be written to, instead of just
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// read. We fixed this on XP. However, it's not enough to just copy the
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// buffer, because it's used later.
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// Not clear what the actual fix is though.
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//
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/*
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HPSTR p = NULL;
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if (lpmmioinfo && lpmmioinfo->pchBuffer &&
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(IsBadWritePtr(lpmmioinfo->pchBuffer, lpmmioinfo->cchBuffer) &&
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!IsBadReadPtr(lpmmioinfo->pchBuffer, lpmmioinfo->cchBuffer))) {
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p = (HPSTR) malloc(lpmmioinfo->cchBuffer);
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if (p) {
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DPFN( eDbgLevelError, "Fixing mmioSetInfo buffer");
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MoveMemory(p, lpmmioinfo->pchBuffer, lpmmioinfo->cchBuffer);
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lpmmioinfo->pchBuffer = p;
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}
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}
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MMRESULT mRet = ORIGINAL_API(mmioSetInfo)(hmmio, lpmmioinfo, wFlags);
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if (p) {
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free(p);
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}
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return mRet;
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*/
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return ORIGINAL_API(mmioSetInfo)(hmmio, lpmmioinfo, wFlags);
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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, GetFileSize)
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APIHOOK_ENTRY(NTDLL.DLL, RtlAllocateHeap)
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APIHOOK_ENTRY(WINMM.DLL, mmioSetInfo)
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HOOK_END
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IMPLEMENT_SHIM_END
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