compiler-rt/test/msan/poison_in_signal.cpp

   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
  15 std::atomic<int> n = {1000};
  16
  17 struct 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(&t, sizeof(t));
  27 }
  28
  29 void *thr(void *p) {
  30   for (; n >= 0;) {
  31     for (int i = 0; i < 1000; i++) {
  32       Poison();
  33     }
  34   }
  35   return 0;
  36 }
  37
  38 void handler(int) {
  39   Poison();
  40   --n;
  41 }
  42
  43 int 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(&th[i], 0, thr, 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[i], 0);
  61
  62   return 0;
  63 }