| // Test interaction of Asan recovery mode with asynch signals. |
| // |
| // RUN: %clang_asan -fsanitize-recover=address -pthread %s -o %t |
| // |
| // RUN: %env_asan_opts=halt_on_error=false:suppress_equal_pcs=false %run %t 100 >%t.log 2>&1 || true |
| // Collision will almost always get triggered but we still need to check the unlikely case: |
| // RUN: FileCheck --check-prefix=CHECK-COLLISION %s <%t.log || FileCheck --check-prefix=CHECK-NO-COLLISION %s <%t.log |
| |
| #define _SVID_SOURCE 1 // SA_NODEFER |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <pthread.h> |
| #include <time.h> |
| #include <signal.h> |
| |
| #include <sanitizer/asan_interface.h> |
| |
| void random_delay(unsigned *seed) { |
| *seed = 1664525 * *seed + 1013904223; |
| struct timespec delay = { 0, (*seed % 1000) * 1000 }; |
| nanosleep(&delay, 0); |
| } |
| |
| volatile char bad[2] = {1, }; |
| |
| void error() { |
| // CHECK-COLLISION: AddressSanitizer: nested bug in the same thread, aborting |
| // CHECK-NO-COLLISION: AddressSanitizer: use-after-poison |
| volatile int idx = 0; |
| bad[idx] = 0; |
| } |
| |
| #define CHECK_CALL(e, msg) do { \ |
| if (0 != (e)) { \ |
| fprintf(stderr, "Failed to " msg "\n"); \ |
| exit(1); \ |
| } \ |
| } while (0) |
| |
| size_t niter = 10; |
| pthread_t sender_tid, receiver_tid; |
| |
| pthread_mutex_t keep_alive_mu = PTHREAD_MUTEX_INITIALIZER; |
| |
| void *sender(void *arg) { |
| unsigned seed = 0; |
| for (size_t i = 0; i < niter; ++i) { |
| random_delay(&seed); |
| CHECK_CALL(pthread_kill(receiver_tid, SIGUSR1), "send signal"); |
| } |
| return 0; |
| } |
| |
| void handler(int sig) { |
| // Expect error collisions here |
| error(); |
| } |
| |
| void *receiver(void *arg) { |
| unsigned seed = 1; |
| for (size_t i = 0; i < niter; ++i) { |
| random_delay(&seed); |
| // And here |
| error(); |
| } |
| // Parent will release this when it's ok to terminate |
| CHECK_CALL(pthread_mutex_lock(&keep_alive_mu), "unlock mutex"); |
| return 0; |
| } |
| |
| int main(int argc, char **argv) { |
| if (argc != 2) { |
| fprintf(stderr, "Syntax: %s niter\n", argv[0]); |
| exit(1); |
| } |
| |
| niter = (size_t)strtoul(argv[1], 0, 0); |
| |
| struct sigaction sa; |
| memset(&sa, 0, sizeof(sa)); |
| sa.sa_handler = handler; |
| sa.sa_flags = SA_NODEFER; // Enable nested handlers to add more stress |
| CHECK_CALL(sigaction(SIGUSR1, &sa, 0), "set sighandler"); |
| |
| __asan_poison_memory_region(&bad, sizeof(bad)); |
| |
| CHECK_CALL(pthread_mutex_lock(&keep_alive_mu), "lock mutex"); |
| CHECK_CALL(pthread_create(&receiver_tid, 0, receiver, 0), "start thread"); |
| CHECK_CALL(pthread_create(&sender_tid, 0, sender, 0), "start thread"); |
| CHECK_CALL(pthread_join(sender_tid, 0), "join thread"); |
| // Now allow receiver to die |
| CHECK_CALL(pthread_mutex_unlock(&keep_alive_mu), "unlock mutex"); |
| CHECK_CALL(pthread_join(receiver_tid, 0), "join thread"); |
| |
| // CHECK-NO-COLLISION: All threads terminated |
| printf("All threads terminated\n"); |
| |
| return 0; |
| } |