We VirtualFree a region in ourselves (the stack) to confirm that the exception reporter captures as much as possible in the minidump and doesn't abort. __debugbreak() immediately after doing so because the process is clearly in a very broken state at this point.
| 35 | // abort. __debugbreak() immediately after doing so because the process is |
| 36 | // clearly in a very broken state at this point. |
| 37 | __declspec(noinline) bool FreeOwnStackAndBreak() { |
| 38 | ProcessReaderWin process_reader; |
| 39 | if (!process_reader.Initialize(GetCurrentProcess(), |
| 40 | ProcessSuspensionState::kRunning)) { |
| 41 | LOG(ERROR) << "ProcessReaderWin Initialize"; |
| 42 | return false; |
| 43 | } |
| 44 | |
| 45 | const std::vector<ProcessReaderWin::Thread> threads = |
| 46 | process_reader.Threads(); |
| 47 | if (threads.empty()) { |
| 48 | LOG(ERROR) << "no threads"; |
| 49 | return false; |
| 50 | } |
| 51 | |
| 52 | // Push the stack up a bit so that hopefully the crash handler can succeed, |
| 53 | // but won't be able to read the base of the stack. |
| 54 | [[maybe_unused]] volatile void* do_not_optimize_away = _alloca(16384); |
| 55 | |
| 56 | // We can't succeed at MEM_RELEASEing this memory, but MEM_DECOMMIT is good |
| 57 | // enough to make it inaccessible. |
| 58 | if (!VirtualFree(reinterpret_cast<void*>(threads[0].stack_region_address), |
| 59 | 100, |
| 60 | MEM_DECOMMIT)) { |
| 61 | PLOG(ERROR) << "VirtualFree"; |
| 62 | return false; |
| 63 | } |
| 64 | |
| 65 | // If the VirtualFree() succeeds, we may have already crashed. __debugbreak() |
| 66 | // just to be sure. |
| 67 | __debugbreak(); |
| 68 | |
| 69 | return true; |
| 70 | } |
| 71 | |
| 72 | __declspec(noinline) int SelfDestroyingMain(int argc, wchar_t* argv[]) { |
| 73 | if (argc != 2) { |
no test coverage detected