1 // Test interaction of Asan recovery mode with asynch signals.
2 //
3 // RUN: %clang_asan -fsanitize-recover=address -pthread %s -o %t
4 //
5 // RUN: rm -f %t.log
6 // RUN: %env_asan_opts=halt_on_error=false:suppress_equal_pcs=false %run %t 100 >%t.log 2>&1 || true
7 // Collision will almost always get triggered but we still need to check the unlikely case:
8 // RUN: FileCheck --check-prefix=CHECK-COLLISION %s < %t.log || FileCheck --check-prefix=CHECK-NO-COLLISION %s < %t.log
9
10 #define _SVID_SOURCE 1 // SA_NODEFER
11
12 #include <stdio.h>
13 #include <stdlib.h>
14 #include <string.h>
15 #include <pthread.h>
16 #include <time.h>
17 #include <signal.h>
18
19 #include <sanitizer/asan_interface.h>
20
random_delay(unsigned * seed)21 void random_delay(unsigned *seed) {
22 *seed = 1664525 * *seed + 1013904223;
23 struct timespec delay = { 0, (*seed % 1000) * 1000 };
24 nanosleep(&delay, 0);
25 }
26
27 volatile char bad[2] = {1, };
28
error()29 void error() {
30 // CHECK-COLLISION: AddressSanitizer: nested bug in the same thread, aborting
31 // CHECK-NO-COLLISION: AddressSanitizer: use-after-poison
32 volatile int idx = 0;
33 bad[idx] = 0;
34 }
35
36 #define CHECK_CALL(e, msg) do { \
37 if (0 != (e)) { \
38 fprintf(stderr, "Failed to " msg "\n"); \
39 exit(1); \
40 } \
41 } while (0)
42
43 size_t niter = 10;
44 pthread_t sender_tid, receiver_tid;
45
46 pthread_mutex_t keep_alive_mu = PTHREAD_MUTEX_INITIALIZER;
47
sender(void * arg)48 void *sender(void *arg) {
49 unsigned seed = 0;
50 for (size_t i = 0; i < niter; ++i) {
51 random_delay(&seed);
52 CHECK_CALL(pthread_kill(receiver_tid, SIGUSR1), "send signal");
53 }
54 return 0;
55 }
56
handler(int sig)57 void handler(int sig) {
58 // Expect error collisions here
59 error();
60 }
61
receiver(void * arg)62 void *receiver(void *arg) {
63 unsigned seed = 1;
64 for (size_t i = 0; i < niter; ++i) {
65 random_delay(&seed);
66 // And here
67 error();
68 }
69 // Parent will release this when it's ok to terminate
70 CHECK_CALL(pthread_mutex_lock(&keep_alive_mu), "unlock mutex");
71 return 0;
72 }
73
main(int argc,char ** argv)74 int main(int argc, char **argv) {
75 if (argc != 2) {
76 fprintf(stderr, "Syntax: %s niter\n", argv[0]);
77 exit(1);
78 }
79
80 niter = (size_t)strtoul(argv[1], 0, 0);
81
82 struct sigaction sa;
83 memset(&sa, 0, sizeof(sa));
84 sa.sa_handler = handler;
85 sa.sa_flags = SA_NODEFER; // Enable nested handlers to add more stress
86 CHECK_CALL(sigaction(SIGUSR1, &sa, 0), "set sighandler");
87
88 __asan_poison_memory_region(&bad, sizeof(bad));
89
90 CHECK_CALL(pthread_mutex_lock(&keep_alive_mu), "lock mutex");
91 CHECK_CALL(pthread_create(&receiver_tid, 0, receiver, 0), "start thread");
92 CHECK_CALL(pthread_create(&sender_tid, 0, sender, 0), "start thread");
93 CHECK_CALL(pthread_join(sender_tid, 0), "join thread");
94 // Now allow receiver to die
95 CHECK_CALL(pthread_mutex_unlock(&keep_alive_mu), "unlock mutex");
96 CHECK_CALL(pthread_join(receiver_tid, 0), "join thread");
97
98 // CHECK-NO-COLLISION: All threads terminated
99 printf("All threads terminated\n");
100
101 return 0;
102 }
103