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AlxcBTW
127ee82f02
APS5_CRASH_STACK_BYTES=<n> prints n bytes of stack words from rsp after the stack return address candidates, then eight words at every distinct stack word that points at readable, non-executable memory outside the thread's stack. Off when the variable is unset, empty or 0.
55 lines
1.9 KiB
C++
55 lines
1.9 KiB
C++
#include <cstdint>
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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#include <windows.h>
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#include "../prx/libc/include/general/VabiMacros.hpp"
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#include "../prx/libc/include/FailureReport.hpp"
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extern "C" int* APS5_VABI __error_nid_postfix();
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namespace {
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void KeptReport() noexcept {
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std::fputs("kept failure report ran\n", stderr);
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}
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void DroppedReport() noexcept {
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std::fputs("dropped failure report ran\n", stderr);
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}
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LONG WINAPI EndAfterReport(EXCEPTION_POINTERS* info) {
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if (info->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION) TerminateProcess(GetCurrentProcess(), 3);
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return EXCEPTION_CONTINUE_SEARCH;
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}
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[[gnu::noinline]] void FaultHoldingObject() {
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AddVectoredExceptionHandler(0, EndAfterReport);
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auto* object = static_cast<std::uint64_t*>(VirtualAlloc(nullptr, 0x10000, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE));
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if (object == nullptr) std::exit(1);
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for (std::uint64_t i = 0; i < 8; ++i) object[i] = 0xc0ffee0000000000ull + i;
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std::uint64_t* volatile held = object;
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volatile int* volatile target = nullptr;
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*target = static_cast<int>(reinterpret_cast<std::uintptr_t>(held));
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}
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}
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int main(int argc, char** argv) {
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if (__error_nid_postfix() == nullptr) return 1;
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if (argc == 2 && std::strcmp(argv[1], "fault") == 0) FaultHoldingObject();
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if (argc == 2 && std::strcmp(argv[1], "report") == 0) {
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LibcRegisterFailureReport_nid_no_patch(DroppedReport);
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LibcRegisterFailureReport_nid_no_patch(KeptReport);
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LibcRegisterFailureReport_nid_no_patch(KeptReport);
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LibcUnregisterFailureReport_nid_no_patch(DroppedReport);
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}
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if (argc == 2 && std::strcmp(argv[1], "report-once") == 0) {
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LibcRegisterFailureReport_nid_no_patch(KeptReport);
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LibcRunFailureReports_nid_no_patch();
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}
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_set_abort_behavior(0, _WRITE_ABORT_MSG | _CALL_REPORTFAULT);
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std::fputs("aborting\n", stderr);
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std::abort();
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}
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