// https://syzkaller.appspot.com/bug?id=3c27eae7bdba97293b68e79c9700ac110f977eed // autogenerated by syzkaller (http://github.com/google/syzkaller) #define _GNU_SOURCE #include #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 (__atomic_load_n(&running, __ATOMIC_RELAXED)) 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, 0x200000002, 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*)0x20000080 = 0x18; *(uint32_t*)0x20000082 = 1; *(uint32_t*)0x20000086 = 0; *(uint32_t*)0x2000008a = r[0]; *(uint32_t*)0x2000008e = 3; *(uint32_t*)0x20000092 = 0; *(uint32_t*)0x20000096 = 1; *(uint32_t*)0x2000009a = 0; *(uint16_t*)0x2000009e = 0xa; *(uint16_t*)0x200000a0 = htobe16(0x4e20); *(uint32_t*)0x200000a2 = 5; *(uint8_t*)0x200000a6 = -1; *(uint8_t*)0x200000a7 = 2; *(uint8_t*)0x200000a8 = 0; *(uint8_t*)0x200000a9 = 0; *(uint8_t*)0x200000aa = 0; *(uint8_t*)0x200000ab = 0; *(uint8_t*)0x200000ac = 0; *(uint8_t*)0x200000ad = 0; *(uint8_t*)0x200000ae = 0; *(uint8_t*)0x200000af = 0; *(uint8_t*)0x200000b0 = 0; *(uint8_t*)0x200000b1 = 0; *(uint8_t*)0x200000b2 = 0; *(uint8_t*)0x200000b3 = 0; *(uint8_t*)0x200000b4 = 0; *(uint8_t*)0x200000b5 = 1; *(uint32_t*)0x200000b6 = 5; syscall(__NR_connect, r[1], 0x20000080, 0x3a); 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; }