// https://syzkaller.appspot.com/bug?id=47ec6043e25102603ddbf1b92b58b7181e1f0077 // autogenerated by syzkaller (http://github.com/google/syzkaller) #define _GNU_SOURCE #include #include #include #include #include #include #include #include static void execute_one(); extern unsigned long long procid; void loop() { while (1) { execute_one(); } } 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; } } } } uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff}; void execute_call(int call) { long res; switch (call) { case 0: res = syscall(__NR_socket, 0x26, 5, 0); if (res != -1) r[0] = res; break; case 1: *(uint16_t*)0x20000000 = 0x26; memcpy((void*)0x20000002, "\x68\x61\x73\x68\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 14); *(uint32_t*)0x20000010 = 0; *(uint32_t*)0x20000014 = 0; memcpy((void*)0x20000018, "\x63\x72\x79\x70\x74\x64\x28\x73\x68\x61\x33\x2d\x33\x38\x34\x2d" "\x67\x65\x6e\x65\x72\x69\x63\x29\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 64); syscall(__NR_bind, r[0], 0x20000000, 0x58); break; case 2: res = syscall(__NR_accept, r[0], 0, 0); if (res != -1) r[1] = res; break; case 3: *(uint64_t*)0x20000f40 = 0; *(uint32_t*)0x20000f48 = 0; *(uint64_t*)0x20000f50 = 0x20000640; *(uint64_t*)0x20000f58 = 0x107; *(uint64_t*)0x20000f60 = 0x20000680; *(uint64_t*)0x20000f68 = 0; *(uint32_t*)0x20000f70 = 0; syscall(__NR_sendmmsg, r[1], 0x20000f40, 0xc95d03eb8aea92df, 0); break; } } void execute_one() { execute(4); collide = 1; execute(4); } int main() { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); for (;;) { loop(); } }