// https://syzkaller.appspot.com/bug?id=a2c1393a92634b515391d1e54519dda3fd87e86c // autogenerated by syzkaller (http://github.com/google/syzkaller) #define _GNU_SOURCE #include #include #include #include #include #include #include #include static void test(); void loop() { while (1) { test(); } } 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 int collide; 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); if (collide && call % 2) break; 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; } } } } long r[3]; void execute_call(int call) { switch (call) { case 0: syscall(__NR_mmap, 0x20000000, 0xe76000, 3, 0x32, -1, 0); break; case 1: r[0] = syscall(__NR_socket, 0xa, 2, 0); break; case 2: r[1] = syscall(__NR_socket, 0x18, 1, 1); break; case 3: *(uint16_t*)0x20354000 = 0x18; *(uint32_t*)0x20354002 = 1; *(uint32_t*)0x20354006 = 0; *(uint32_t*)0x2035400a = r[0]; *(uint16_t*)0x2035400e = 3; *(uint16_t*)0x20354010 = 0; *(uint16_t*)0x20354012 = 3; *(uint16_t*)0x20354014 = 0; *(uint16_t*)0x20354016 = 0xa; *(uint16_t*)0x20354018 = htobe16(0x4e22); *(uint32_t*)0x2035401a = 3; *(uint8_t*)0x2035401e = 0xfe; *(uint8_t*)0x2035401f = 0x80; *(uint8_t*)0x20354020 = 0; *(uint8_t*)0x20354021 = 0; *(uint8_t*)0x20354022 = 0; *(uint8_t*)0x20354023 = 0; *(uint8_t*)0x20354024 = 0; *(uint8_t*)0x20354025 = 0; *(uint8_t*)0x20354026 = 0; *(uint8_t*)0x20354027 = 0; *(uint8_t*)0x20354028 = 0; *(uint8_t*)0x20354029 = 0; *(uint8_t*)0x2035402a = 0; *(uint8_t*)0x2035402b = 0; *(uint8_t*)0x2035402c = 0; *(uint8_t*)0x2035402d = 0xbb; *(uint32_t*)0x2035402e = 4; syscall(__NR_connect, r[1], 0x20354000, 0x32); break; case 4: r[2] = syscall(__NR_socket, 0x18, 1, 1); break; case 5: syscall(__NR_close, r[0]); break; case 6: syscall(__NR_dup2, r[2], r[1]); break; } } void test() { memset(r, -1, sizeof(r)); execute(7); collide = 1; execute(7); } int main() { for (;;) { loop(); } }