1// Stress test of poisoning from signal handler.
2
3// RUN: %clangxx_msan -std=c++11 -O2 %s -o %t && %run %t
4// RUN: %clangxx_msan -fsanitize-memory-track-origins=2 -std=c++11 -O2 %s -o %t && %run %t
5// RUN: %clangxx_msan -fsanitize-memory-track-origins=2 -fsanitize-memory-use-after-dtor -std=c++11 -O2 %s -o %t && %run %t
6
7#include <assert.h>
8#include <atomic>
9#include <pthread.h>
10#include <signal.h>
11#include <sys/time.h>
12
13#include <sanitizer/msan_interface.h>
14
15std::atomic<int> n = {1000};
16
17struct Tmp {
18 char buff[1];
19 ~Tmp() {}
20};
21
22__attribute__((noinline, optnone)) void Poison() {
23 // use-after-dtor.
24 volatile Tmp t;
25 // Regular poisoning.
26 __msan_poison(a: &t, size: sizeof(t));
27}
28
29void *thr(void *p) {
30 for (; n >= 0;) {
31 for (int i = 0; i < 1000; i++) {
32 Poison();
33 }
34 }
35 return 0;
36}
37
38void handler(int) {
39 Poison();
40 --n;
41}
42
43int main(int argc, char **argv) {
44 const int kThreads = 10;
45 pthread_t th[kThreads];
46 for (int i = 0; i < kThreads; i++)
47 pthread_create(newthread: &th[i], attr: 0, start_routine: thr, arg: 0);
48
49 struct sigaction sa = {};
50 sa.sa_handler = handler;
51 assert(!sigaction(SIGPROF, &sa, 0));
52
53 itimerval t;
54 t.it_value.tv_sec = 0;
55 t.it_value.tv_usec = 10;
56 t.it_interval = t.it_value;
57 assert(!setitimer(ITIMER_PROF, &t, 0));
58
59 for (int i = 0; i < kThreads; i++)
60 pthread_join(th: th[i], thread_return: 0);
61
62 return 0;
63}
64

source code of compiler-rt/test/msan/poison_in_signal.cpp