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Avoid re-entrancy between __sanitizer::Report, OutputDebugString, and RtlRaiseException 

Our Report implementation calls OutputDebugString, which calls
RtlRaiseException, which can re-enter back into the ASan runtime and
cause a hang.

Don't treat this special debugger-only exception code as a noreturn
event, since the stack won't really unwind all the way.

llvm-svn: 277763
This commit is contained in:
Reid Kleckner 2016-08-04 20:05:13 +00:00
parent d938e88e89
commit c696467530
1 changed files with 5 additions and 2 deletions
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7
compiler-rt/lib/asan/asan_win.cc
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@ -71,9 +71,12 @@ void __asan_default_on_error() {}
} // extern "C" } // extern "C"
// ---------------------- Windows-specific interceptors ---------------- {{{ // ---------------------- Windows-specific interceptors ---------------- {{{
INTERCEPTOR_WINAPI(void, RtlRaiseException, void *ExceptionRecord) { INTERCEPTOR_WINAPI(void, RtlRaiseException, EXCEPTION_RECORD *ExceptionRecord) {
CHECK(REAL(RtlRaiseException)); CHECK(REAL(RtlRaiseException));
__asan_handle_no_return(); // This is a noreturn function, unless it's one of the exceptions raised to
// communicate with the debugger, such as the one from OutputDebugString.
if (ExceptionRecord->ExceptionCode != DBG_PRINTEXCEPTION_C)
__asan_handle_no_return();
REAL(RtlRaiseException)(ExceptionRecord); REAL(RtlRaiseException)(ExceptionRecord);
} }