diff options
Diffstat (limited to 'libfuzzer/FuzzerUtilPosix.cpp')
-rw-r--r-- | libfuzzer/FuzzerUtilPosix.cpp | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/libfuzzer/FuzzerUtilPosix.cpp b/libfuzzer/FuzzerUtilPosix.cpp index afb7334..0446d73 100644 --- a/libfuzzer/FuzzerUtilPosix.cpp +++ b/libfuzzer/FuzzerUtilPosix.cpp @@ -77,10 +77,13 @@ static void SetSigaction(int signum, return; } - sigact = {}; - sigact.sa_flags = SA_SIGINFO; - sigact.sa_sigaction = callback; - if (sigaction(signum, &sigact, 0)) { + struct sigaction new_sigact = {}; + // Address sanitizer needs SA_ONSTACK (causing the signal handler to run on a + // dedicated stack) in order to be able to detect stack overflows; keep the + // flag if it's set. + new_sigact.sa_flags = SA_SIGINFO | (sigact.sa_flags & SA_ONSTACK); + new_sigact.sa_sigaction = callback; + if (sigaction(signum, &new_sigact, nullptr)) { Printf("libFuzzer: sigaction failed with %d\n", errno); exit(1); } |