// https://syzkaller.appspot.com/bug?id=de316389db0fa0cd7ced6e564601ea8e56625ebc // autogenerated by syzkaller (http://github.com/google/syzkaller) #define _GNU_SOURCE #include #include #include #include #include #include #include #include struct thread_t { int created, running, call; pthread_t th; }; 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 (;;) { while (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) syscall(SYS_futex, &th->running, FUTEX_WAIT, 0, 0); execute_call(th->call); __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED); __atomic_store_n(&th->running, 0, __ATOMIC_RELEASE); syscall(SYS_futex, &th->running, FUTEX_WAKE); } return 0; } static void execute(int num_calls) { int call, thread; running = 0; for (call = 0; call < num_calls; call++) { for (thread = 0; thread < sizeof(threads) / sizeof(threads[0]); thread++) { struct thread_t* th = &threads[thread]; if (!th->created) { th->created = 1; pthread_attr_t attr; pthread_attr_init(&attr); pthread_attr_setstacksize(&attr, 128 << 10); pthread_create(&th->th, &attr, thr, th); } if (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) { th->call = call; __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED); __atomic_store_n(&th->running, 1, __ATOMIC_RELEASE); syscall(SYS_futex, &th->running, FUTEX_WAKE); struct timespec ts; ts.tv_sec = 0; ts.tv_nsec = 20 * 1000 * 1000; syscall(SYS_futex, &th->running, FUTEX_WAIT, 1, &ts); if (running) usleep((call == num_calls - 1) ? 10000 : 1000); break; } } } } uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff}; void execute_call(int call) { long res; switch (call) { case 0: res = syscall(__NR_socket, 2, 2, 0); if (res != -1) r[0] = res; break; case 1: res = syscall(__NR_socket, 0x18, 1, 1); if (res != -1) r[1] = res; break; case 2: *(uint16_t*)0x20e92000 = 0x18; *(uint32_t*)0x20e92002 = 1; *(uint32_t*)0x20e92006 = 0; *(uint32_t*)0x20e9200a = r[0]; *(uint16_t*)0x20e9200e = 2; *(uint16_t*)0x20e92010 = htobe16(1); *(uint8_t*)0x20e92012 = 0xac; *(uint8_t*)0x20e92013 = 0x14; *(uint8_t*)0x20e92014 = 0; *(uint8_t*)0x20e92015 = 0xbb; *(uint8_t*)0x20e92016 = 0; *(uint8_t*)0x20e92017 = 0; *(uint8_t*)0x20e92018 = 0; *(uint8_t*)0x20e92019 = 0; *(uint8_t*)0x20e9201a = 0; *(uint8_t*)0x20e9201b = 0; *(uint8_t*)0x20e9201c = 0; *(uint8_t*)0x20e9201d = 0; *(uint32_t*)0x20e9201e = 2; *(uint32_t*)0x20e92022 = 0; *(uint32_t*)0x20e92026 = 4; *(uint32_t*)0x20e9202a = 0; syscall(__NR_connect, r[1], 0x20e92000, 0x2e); break; case 3: syscall(__NR_close, r[0]); break; case 4: syscall(__NR_close, r[1]); break; } } void loop() { execute(5); } int main() { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); loop(); return 0; }