// https://syzkaller.appspot.com/bug?id=88055a9984a626492205684d3d094d8d39d93979 // autogenerated by syzkaller (http://github.com/google/syzkaller) #define _GNU_SOURCE #include #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 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}; unsigned long long procid; void execute_call(int call) { long res; switch (call) { case 0: memcpy((void*)0x20000b80, "./file1", 8); syscall(__NR_mkdir, 0x20000b80, 0); break; case 1: res = syscall(__NR_pipe2, 0x20000240, 0); if (res != -1) { r[0] = *(uint32_t*)0x20000240; r[1] = *(uint32_t*)0x20000244; } break; case 2: memcpy((void*)0x20000140, "./file1", 8); memcpy((void*)0x20000180, "9p", 3); memcpy((void*)0x20000300, "trans=fd,", 9); memcpy((void*)0x20000309, "rfdno", 5); *(uint8_t*)0x2000030e = 0x3d; sprintf((char*)0x2000030f, "0x%016llx", (long long)r[0]); *(uint8_t*)0x20000321 = 0x2c; memcpy((void*)0x20000322, "wfdno", 5); *(uint8_t*)0x20000327 = 0x3d; sprintf((char*)0x20000328, "0x%016llx", (long long)r[1]); *(uint8_t*)0x2000033a = 0x2c; memcpy((void*)0x2000033b, "cache=loose", 11); *(uint8_t*)0x20000346 = 0x2c; memcpy((void*)0x20000347, "uname", 5); *(uint8_t*)0x2000034c = 0x3d; memcpy((void*)0x2000034d, "9P2000.u", 8); *(uint8_t*)0x20000355 = 0x2c; memcpy((void*)0x20000356, "posixacl", 8); *(uint8_t*)0x2000035e = 0x2c; memcpy((void*)0x2000035f, "uname", 5); *(uint8_t*)0x20000364 = 0x3d; memcpy((void*)0x20000365, "+", 1); *(uint8_t*)0x20000366 = 0x2c; memcpy((void*)0x20000367, "fscache", 7); *(uint8_t*)0x2000036e = 0x2c; memcpy((void*)0x2000036f, "mmap", 4); *(uint8_t*)0x20000373 = 0x2c; memcpy((void*)0x20000374, "access=client", 13); *(uint8_t*)0x20000381 = 0x2c; *(uint8_t*)0x20000382 = 0; syscall(__NR_mount, 0, 0x20000140, 0x20000180, 0, 0x20000300); break; case 3: *(uint32_t*)0x20000480 = 7; *(uint8_t*)0x20000484 = 0x65; *(uint16_t*)0x20000485 = -1; *(uint32_t*)0x20000487 = 0x295d; *(uint16_t*)0x2000048b = 0xfe5b; memcpy((void*)0x2000048d, "9P2000", 6); syscall(__NR_write, r[1], 0x20000480, 0x15); break; } } void execute_one() { execute(4); } int main() { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); for (procid = 0; procid < 8; procid++) { if (fork() == 0) { for (;;) { loop(); } } } sleep(1000000); return 0; }