#include "interception/interception.h"
#include "msan_origin.h"
+#include "msan_thread.h"
#include "sanitizer_common/sanitizer_common.h"
DECLARE_REAL(void *, memset, void *dest, int c, uptr n)
SetShadow(dst, size, (u8)-1);
if (__msan_get_track_origins()) {
+ MsanThread *t = GetCurrentThread();
+ if (t && t->InSignalHandler())
+ return;
Origin o = Origin::CreateHeapOrigin(stack);
SetOrigin(dst, size, o.raw_id());
}
--- /dev/null
+// Stress test of poisoning from signal handler.
+
+// RUN: %clangxx_msan -std=c++11 -O2 %s -o %t && %run %t
+// RUN: %clangxx_msan -fsanitize-memory-track-origins=2 -std=c++11 -O2 %s -o %t && %run %t
+// RUN: %clangxx_msan -fsanitize-memory-track-origins=2 -fsanitize-memory-use-after-dtor -std=c++11 -O2 %s -o %t && MSAN_OPTIONS=poison_in_dtor=1 %run %t
+
+#include <assert.h>
+#include <atomic>
+#include <pthread.h>
+#include <signal.h>
+#include <sys/time.h>
+
+#include <sanitizer/msan_interface.h>
+
+std::atomic<int> n = {1000};
+
+struct Tmp {
+ char buff[1];
+ ~Tmp() {}
+};
+
+__attribute__((noinline, optnone)) void Poison() {
+ // use-after-dtor.
+ volatile Tmp t;
+ // Regular poisoning.
+ __msan_poison(&t, sizeof(t));
+}
+
+void *thr(void *p) {
+ for (; n >= 0;) {
+ for (int i = 0; i < 1000; i++) {
+ Poison();
+ }
+ }
+ return 0;
+}
+
+void handler(int) {
+ Poison();
+ --n;
+}
+
+int main(int argc, char **argv) {
+ const int kThreads = 10;
+ pthread_t th[kThreads];
+ for (int i = 0; i < kThreads; i++)
+ pthread_create(&th[i], 0, thr, 0);
+
+ struct sigaction sa = {};
+ sa.sa_handler = handler;
+ assert(!sigaction(SIGPROF, &sa, 0));
+
+ itimerval t;
+ t.it_value.tv_sec = 0;
+ t.it_value.tv_usec = 10;
+ t.it_interval = t.it_value;
+ assert(!setitimer(ITIMER_PROF, &t, 0));
+
+ for (int i = 0; i < kThreads; i++)
+ pthread_join(th[i], 0);
+
+ return 0;
+}