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Merge pull request #1655 from Soreepeong/fix/entrypoint-correctness-1

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Do FlushInstructionCache after WriteProcessMemory
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goat 2024-02-16 00:25:45 +01:00 • committed by GitHub
commit ff1553aece
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1 changed files with 2 additions and 20 deletions
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22
Dalamud.Boot/rewrite_entrypoint.cpp
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@ -303,6 +303,7 @@ extern "C" HRESULT WINAPI RewriteRemoteEntryPointW(HANDLE hProcess, const wchar_
// Overwrite remote process' entry point with a thunk that will load our DLLs and call our trampoline function.
last_operation = std::format(L"write_process_memory_or_throw(entrypoint={:X}, {}b)", reinterpret_cast<uintptr_t>(entrypoint), buffer.size());
write_process_memory_or_throw(hProcess, entrypoint, entrypoint_replacement.data(), entrypoint_replacement.size());
FlushInstructionCache(hProcess, entrypoint, entrypoint_replacement.size());
return S_OK;
} catch (const std::exception& e) {
@ -332,26 +333,6 @@ extern "C" HRESULT WINAPI RewriteRemoteEntryPointW(HANDLE hProcess, const wchar_
}
}
static void AbortRewrittenEntryPoint(DWORD err, const std::wstring& clue) {
wchar_t* pwszMsg = nullptr;
FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
nullptr,
err,
MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US),
reinterpret_cast<LPWSTR>(&pwszMsg),
0,
nullptr);
if (MessageBoxW(nullptr, std::format(
L"Failed to load Dalamud. Load game without Dalamud(yes) or abort(no)?\n\n{}\n\n{}",
utils::format_win32_error(err),
clue).c_str(),
L"Dalamud.Boot", MB_OK | MB_YESNO) == IDNO)
ExitProcess(-1);
}
/// @brief Entry point function "called" instead of game's original main entry point.
/// @param params Parameters set up from RewriteRemoteEntryPoint.
extern "C" void WINAPI RewrittenEntryPoint_AdjustedStack(RewrittenEntryPointParameters & params) {
@ -369,6 +350,7 @@ extern "C" void WINAPI RewrittenEntryPoint_AdjustedStack(RewrittenEntryPointPara
// Use WriteProcessMemory instead of memcpy to avoid having to fiddle with VirtualProtect.
last_operation = L"restore original entry point";
write_process_memory_or_throw(GetCurrentProcess(), params.pEntrypoint, pOriginalEntryPointBytes, params.entrypointLength);
FlushInstructionCache(GetCurrentProcess(), params.pEntrypoint, params.entrypointLength);
hMainThreadContinue = CreateEventW(nullptr, true, false, nullptr);
last_operation = L"hMainThreadContinue = CreateEventW";