mirror of
https://github.com/Dingo-Shenanigans/ReSkate.git
synced 2026-10-17 15:07:06 +02:00
AyeZeeBB
3249f747dc
Most crashes are caught by the game's own fatal handlers, which write a dump of thread stacks only; the launcher could only copy it after the game had exited. A crash on a freed or overwritten object then showed the faulting registers but not the object or the list it came from. - game_fatal_dump: the game's MiniDumpWriteDump import points at ReSkate. Before the game writes its dump, the crash reporter takes its own of the still-running game for the faulting thread; the game's dump follows as before. Reports say capture.source "game-fatal-handler". - The reporter's dumps include the memory the stacks point at (MiniDumpWithIndirectlyReferencedMemory), a few MB more a report. - The shared report says who asked for the dump (protocol version 4). - Tests: a game-handler crash is captured with a heap block only its stack points at; ReSkate's own capture keeps it too.
72 lines
3.1 KiB
C++
72 lines
3.1 KiB
C++
#include "game_fatal_dump.h"
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#include "Engine/Core/Debug/crash_report.h"
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#include "Engine/Core/Platform/memory.h"
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#include "Engine/Game/Build/addresses.h"
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#include "Engine/Game/Build/20260929/game_fatal_dump.h"
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#include <Windows.h>
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#include <DbgHelp.h>
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#include <algorithm>
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#include <atomic>
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#include <mutex>
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namespace dingosdk {
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namespace {
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namespace contract = addr::game_fatal_dump;
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using WriteDump = BOOL(WINAPI*)(HANDLE, DWORD, HANDLE, MINIDUMP_TYPE, PMINIDUMP_EXCEPTION_INFORMATION,
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PMINIDUMP_USER_STREAM_INFORMATION, PMINIDUMP_CALLBACK_INFORMATION);
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std::atomic<WriteDump> original_write{};
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std::uintptr_t installed_base{};
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std::mutex install_mutex;
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// Only a dump of this process with an exception to show is a crash; the game's dump follows
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// whether or not the reporter took one. (Its pointers are this process's either way.)
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BOOL WINAPI write_dump(HANDLE process, DWORD process_id, HANDLE file, MINIDUMP_TYPE type,
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PMINIDUMP_EXCEPTION_INFORMATION exception, PMINIDUMP_USER_STREAM_INFORMATION streams,
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PMINIDUMP_CALLBACK_INFORMATION callback) {
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if (exception && exception->ExceptionPointers && process_id == GetCurrentProcessId())
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crash_report::capture_game_fatal(exception->ThreadId, exception->ExceptionPointers);
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return original_write.load(std::memory_order_acquire)(process, process_id, file, type, exception, streams, callback);
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}
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// The slot holds the export it was bound to: MiniDumpWriteDump of the module that address is in.
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bool bound_to_minidump(std::uintptr_t value) noexcept {
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HMODULE module{};
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if (!value || !GetModuleHandleExW(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS | GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
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reinterpret_cast<LPCWSTR>(value), &module)) return false;
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return reinterpret_cast<std::uintptr_t>(GetProcAddress(module, "MiniDumpWriteDump")) == value;
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}
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} // namespace
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bool start_game_fatal_dump(std::uintptr_t base, std::string& error) {
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std::lock_guard lock(install_mutex);
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error.clear();
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if (installed_base) {
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if (installed_base == base) return true;
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error = "already installed on another image";
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return false;
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}
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std::array<std::uint8_t, contract::thunk_bytes.size()> thunk{};
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std::uintptr_t bound{};
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if (!memory::read_bytes(base + contract::thunk, thunk.data(), thunk.size()) ||
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!std::equal(thunk.begin(), thunk.end(), contract::thunk_bytes.begin()) ||
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!memory::read(base + contract::import_slot, bound) || !bound_to_minidump(bound)) {
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error = "the game's MiniDumpWriteDump import does not match the supported game";
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return false;
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}
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original_write.store(reinterpret_cast<WriteDump>(bound), std::memory_order_release);
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auto* const slot = reinterpret_cast<void**>(base + contract::import_slot);
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DWORD previous{};
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if (!VirtualProtect(slot, sizeof(void*), PAGE_READWRITE, &previous)) {
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error = "its import slot could not be made writable";
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return false;
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}
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InterlockedExchangePointer(slot, reinterpret_cast<void*>(&write_dump));
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DWORD ignored{};
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VirtualProtect(slot, sizeof(void*), previous, &ignored);
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installed_base = base;
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return true;
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}
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} // namespace dingosdk
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