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ensure memory regions are writeable before patching

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zeffy
2017-08-22 19:06:11 -07:00
parent ba62a5f3a1
commit d2eec956f9
1 changed files with 6 additions and 0 deletions
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6
wufuc/hooks.c
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@@ -169,13 +169,19 @@ BOOL PatchWUA(HMODULE hModule) {
lpbIsCPUSupportedResult = (LPBOOL)(*(uintptr_t *)(ptr + offset01)); lpbIsCPUSupportedResult = (LPBOOL)(*(uintptr_t *)(ptr + offset01));
#endif #endif
DWORD flNewProtect = PAGE_READWRITE;
DWORD flOldProtect;
if (*lpbFirstRun) { if (*lpbFirstRun) {
VirtualProtect(lpbFirstRun, sizeof(BOOL), flNewProtect, &flOldProtect);
*lpbFirstRun = FALSE; *lpbFirstRun = FALSE;
VirtualProtect(lpbFirstRun, sizeof(BOOL), flOldProtect, &flNewProtect);
trace(L"Patched boolean value #1: %p = %08x", lpbFirstRun, *lpbFirstRun); trace(L"Patched boolean value #1: %p = %08x", lpbFirstRun, *lpbFirstRun);
result = TRUE; result = TRUE;
} }
if (!*lpbIsCPUSupportedResult) { if (!*lpbIsCPUSupportedResult) {
VirtualProtect(lpbIsCPUSupportedResult, sizeof(BOOL), flNewProtect, &flOldProtect);
*lpbIsCPUSupportedResult = TRUE; *lpbIsCPUSupportedResult = TRUE;
VirtualProtect(lpbIsCPUSupportedResult, sizeof(BOOL), flOldProtect, &flNewProtect);
trace(L"Patched boolean value #2: %p = %08x", lpbIsCPUSupportedResult, *lpbIsCPUSupportedResult); trace(L"Patched boolean value #2: %p = %08x", lpbIsCPUSupportedResult, *lpbIsCPUSupportedResult);
result = TRUE; result = TRUE;
} }