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Crashlog: Windows: Use VirtualAlloc for crash log object and text buffer

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This commit is contained in:
Jonathan G Rennison
2024-03-18 19:20:21 +00:00
parent 3064523f46
commit 4a767b279c
1 changed files with 13 additions and 8 deletions
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21
src/os/windows/crashlog_win.cpp
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@@ -93,7 +93,7 @@ public:
#endif /* _MSC_VER */
/** Buffer for the generated crash log */
char crashlog[65536 * 4];
std::span<char> crashlog_buffer;
/**
* A crash log is always generated when it's generated.
@@ -102,7 +102,6 @@ public:
CrashLogWindows(EXCEPTION_POINTERS *ep = nullptr) :
ep(ep), crash_thread_id(GetCurrentThreadId())
{
this->crashlog[0] = '\0';
this->crashlog_filename[0] = '\0';
this->crashdump_filename[0] = '\0';
this->screenshot_filename[0] = '\0';
@@ -559,8 +558,8 @@ static const uint MAX_FRAMES = 64;
MINIDUMP_USER_STREAM_INFORMATION musi;
userstream.Type = LastReservedStream + 1;
userstream.Buffer = const_cast<void *>(static_cast<const void*>(this->crashlog));
userstream.BufferSize = (ULONG)strlen(this->crashlog) + 1;
userstream.Buffer = const_cast<void *>(static_cast<const void*>(this->crashlog_buffer.data()));
userstream.BufferSize = (ULONG)strlen(this->crashlog_buffer.data()) + 1;
musi.UserStreamCount = 1;
musi.UserStreamArray = &userstream;
@@ -693,7 +692,13 @@ static LONG WINAPI ExceptionHandler(EXCEPTION_POINTERS *ep)
}
return EXCEPTION_EXECUTE_HANDLER;
} else if (log == nullptr) {
log = new CrashLogWindows(ep);
/* Use VirtualAlloc to allocate the buffer for the crash log object and text buffer.
* It is too large for the stack, and the crash may have been caused by heap corruption.
* Make the crash log text buffer at least 4 x 64k, round allocation up to multiple of 64k. */
const size_t alloc_size = Align(sizeof(CrashLogWindows) + 0x40000, 0x10000);
void *raw_buffer = VirtualAlloc(nullptr, alloc_size, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
log = new (raw_buffer) CrashLogWindows(ep);
log->crashlog_buffer = std::span<char>(reinterpret_cast<char *>(raw_buffer) + sizeof(CrashLogWindows), reinterpret_cast<char *>(raw_buffer) + alloc_size);
}
} while (!CrashLogWindows::current.compare_exchange_weak(cur, log));
@@ -706,7 +711,7 @@ static LONG WINAPI ExceptionHandler(EXCEPTION_POINTERS *ep)
ImmediateExitProcess(3);
}
log->MakeCrashLog(log->crashlog, lastof(log->crashlog));
log->MakeCrashLog(log->crashlog_buffer.data(), log->crashlog_buffer.data() + log->crashlog_buffer.size() - 1);
/* Close any possible log files */
CloseConsoleLogIfActive();
@@ -880,7 +885,7 @@ static INT_PTR CALLBACK CrashDialogFunc(HWND wnd, UINT msg, WPARAM wParam, LPARA
case WM_INITDIALOG: {
uint crashlog_length = 0;
CrashLogWindows *cur = CrashLogWindows::current.load();
for (const char *p = cur->crashlog; *p != 0; p++) {
for (const char *p = cur->crashlog_buffer.data(); *p != 0; p++) {
if (*p == '\n') {
/* Reserve extra space for LF to CRLF conversion */
crashlog_length++;
@@ -903,7 +908,7 @@ static INT_PTR CALLBACK CrashDialogFunc(HWND wnd, UINT msg, WPARAM wParam, LPARA
char *dos_nl = reinterpret_cast<char *>(crash_msgW + crash_msgW_length);
/* Convert unix -> dos newlines because the edit box only supports that properly :( */
const char *unix_nl = cur->crashlog;
const char *unix_nl = cur->crashlog_buffer.data();
char *p = dos_nl;
char32_t c;
while ((c = Utf8Consume(&unix_nl)) && p < (dos_nl + dos_nl_length - 1) - 4) { // 4 is max number of bytes per character