// https://syzkaller.appspot.com/bug?id=5fcd04dcb33baf80f736b53e5cd18328fa3ca0b0 // autogenerated by syzkaller (https://github.com/google/syzkaller) #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static void sleep_ms(uint64_t ms) { usleep(ms * 1000); } static uint64_t current_time_ms(void) { struct timespec ts; if (clock_gettime(CLOCK_MONOTONIC, &ts)) exit(1); return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000; } static void thread_start(void* (*fn)(void*), void* arg) { pthread_t th; pthread_attr_t attr; pthread_attr_init(&attr); pthread_attr_setstacksize(&attr, 128 << 10); int i = 0; for (; i < 100; i++) { if (pthread_create(&th, &attr, fn, arg) == 0) { pthread_attr_destroy(&attr); return; } if (errno == EAGAIN) { usleep(50); continue; } break; } exit(1); } typedef struct { pthread_mutex_t mu; pthread_cond_t cv; int state; } event_t; static void event_init(event_t* ev) { if (pthread_mutex_init(&ev->mu, 0)) exit(1); if (pthread_cond_init(&ev->cv, 0)) exit(1); ev->state = 0; } static void event_reset(event_t* ev) { ev->state = 0; } static void event_set(event_t* ev) { pthread_mutex_lock(&ev->mu); if (ev->state) exit(1); ev->state = 1; pthread_mutex_unlock(&ev->mu); pthread_cond_broadcast(&ev->cv); } static void event_wait(event_t* ev) { pthread_mutex_lock(&ev->mu); while (!ev->state) pthread_cond_wait(&ev->cv, &ev->mu); pthread_mutex_unlock(&ev->mu); } static int event_isset(event_t* ev) { pthread_mutex_lock(&ev->mu); int res = ev->state; pthread_mutex_unlock(&ev->mu); return res; } static int event_timedwait(event_t* ev, uint64_t timeout) { uint64_t start = current_time_ms(); uint64_t now = start; pthread_mutex_lock(&ev->mu); for (;;) { if (ev->state) break; uint64_t remain = timeout - (now - start); struct timespec ts; ts.tv_sec = remain / 1000; ts.tv_nsec = (remain % 1000) * 1000 * 1000; pthread_cond_timedwait(&ev->cv, &ev->mu, &ts); now = current_time_ms(); if (now - start > timeout) break; } int res = ev->state; pthread_mutex_unlock(&ev->mu); return res; } #define CAST struct thread_t { int created, call; event_t ready, done; }; static struct thread_t threads[16]; static void execute_call(int call); static int running; static void* thr(void* arg) { struct thread_t* th = (struct thread_t*)arg; for (;;) { event_wait(&th->ready); event_reset(&th->ready); execute_call(th->call); __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED); event_set(&th->done); } return 0; } static void loop(void) { int i, call, thread; for (call = 0; call < 2; call++) { for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0])); thread++) { struct thread_t* th = &threads[thread]; if (!th->created) { th->created = 1; event_init(&th->ready); event_init(&th->done); event_set(&th->done); thread_start(thr, th); } if (!event_isset(&th->done)) continue; event_reset(&th->done); th->call = call; __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED); event_set(&th->ready); event_timedwait(&th->done, 50); break; } } for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++) sleep_ms(1); } uint64_t r[1] = {0xffffffffffffffff}; void execute_call(int call) { intptr_t res = 0; switch (call) { case 0: res = -1; res = ((intptr_t(*)(intptr_t,intptr_t,intptr_t))CAST(socket))(/*domain=*/0x11, /*type=*/3, /*proto=*/0); if (res != -1) r[0] = res; break; case 1: memcpy((void*)0x200000c0, "\xb1\x00\x05\x01\x60\x00\x00\x00\x00\x00\x00\x00\x07\x00\x00\x00\x33\x1c\x13\xfe\xce\xa1\x05\x00\xfe\xf9\x6e\xcf\xc7\x2f\xd3\x35\x7a\xe3\x20\xb3\x7b\x67\x30\x39\xd2\xd2\x36\xac\xf2\x0b\x78\x04\xbe\x38\x16\x49\x91\xf7\xc8\xcf\x5f\x88\x2b\x29\x7b\xe1\xaa\x5b\x23\x6d\xeb\x51\xe2\xf0\xac\x3e\xbb\xc2\x57\x69\x9a\x5f\x13\x9b\x67\x2f\x4d\x33\x5d\x22\x3e\x7d\x02\x6b\xa8\xaf\x63\x00\x37\x28\x21\x02\x00\x00\x00\x72\x0f\xd3\x8b\xfb\xb7\x70\xc1\xf5\xa8\x72\xc8\x81\xea\x6e\x69\xe0\xbb\x76\xd9\x07\xc4\x00\x00\x02\x00\x36\x1b\x12\x57\xae\xa8\xc5\x00\x00\x20\x02\x00\x00\x00\x00\x00\x00\x8a\xbf\xba\x09\x00\x00\x00\x08\xe3\x71\xa3\xf8\x34\x37\x12\x05\x1e\xad\xb7\x1d\x89\xe0\x00\x04\x07\x81\xe4\xb2\xff\xf8\x00\xff\x00", 177); ((intptr_t(*)(intptr_t,intptr_t,intptr_t,intptr_t,intptr_t,intptr_t))CAST(sendto))(/*fd=*/r[0], /*buf=*/0x200000c0, /*len=*/0xb1, /*f=*/0, /*addr=*/0, /*addrlen=*/0); break; } } int main(void) { ((intptr_t(*)(intptr_t,intptr_t,intptr_t,intptr_t,intptr_t,intptr_t))CAST(mmap))(/*addr=*/0x20000000, /*len=*/0x1000000, /*prot=*/3, /*flags=*/0x1012, /*fd=*/-1, /*offset=*/0); loop(); return 0; }