// https://syzkaller.appspot.com/bug?id=c9330c42eae0032dfb0917f979d8c40ad3722e77 // 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[1] = {0xffffffffffffffff}; void execute_call(int call) { long res; switch (call) { case 0: memcpy((void*)0x20000000, "./file0", 8); syscall(__NR_mkdirat, 0xffffff9c, 0x20000000, 0); break; case 1: memcpy((void*)0x20000340, "/dev/fuse", 10); res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000340, 2, 0); if (res != -1) r[0] = res; break; case 2: memcpy((void*)0x20000200, "./file0", 8); memcpy((void*)0x20000300, "fuse", 5); memcpy((void*)0x20000400, "fd", 2); *(uint8_t*)0x20000402 = 0x3d; sprintf((char*)0x20000403, "0x%016llx", (long long)r[0]); *(uint8_t*)0x20000415 = 0x2c; memcpy((void*)0x20000416, "rootmode", 8); *(uint8_t*)0x2000041e = 0x3d; sprintf((char*)0x2000041f, "%023llo", (long long)0x4000); *(uint8_t*)0x20000436 = 0x2c; memcpy((void*)0x20000437, "user_id", 7); *(uint8_t*)0x2000043e = 0x3d; sprintf((char*)0x2000043f, "%020llu", (long long)0); *(uint8_t*)0x20000453 = 0x2c; memcpy((void*)0x20000454, "group_id", 8); *(uint8_t*)0x2000045c = 0x3d; sprintf((char*)0x2000045d, "%020llu", (long long)0); *(uint8_t*)0x20000471 = 0x2c; *(uint8_t*)0x20000472 = 0; syscall(__NR_mount, 0, 0x20000200, 0x20000300, 0, 0x20000400); break; case 3: memcpy((void*)0x200000c0, "./file0/file0", 14); syscall(__NR_stat, 0x200000c0, 0x20000480); break; case 4: *(uint32_t*)0x20000280 = 0x33; *(uint32_t*)0x20000284 = 6; *(uint64_t*)0x20000288 = 0; *(uint64_t*)0x20000290 = 1; *(uint64_t*)0x20000298 = 6; *(uint32_t*)0x200002a0 = 0xa; *(uint32_t*)0x200002a4 = 0; memcpy((void*)0x200002a8, "/dev/fuse", 10); *(uint8_t*)0x200002b2 = 0; syscall(__NR_write, r[0], 0x20000280, 0x33); break; case 5: syscall(__NR_read, r[0], 0x20001000, 0x1000); break; case 6: syscall(__NR_read, r[0], 0x200020c0, 0x1000); break; case 7: *(uint32_t*)0x20000100 = 0x50; *(uint32_t*)0x20000104 = 0; *(uint64_t*)0x20000108 = 1; *(uint32_t*)0x20000110 = 7; *(uint32_t*)0x20000114 = 0x1b; *(uint32_t*)0x20000118 = 0; *(uint32_t*)0x2000011c = 0; *(uint16_t*)0x20000120 = 0; *(uint16_t*)0x20000122 = 0; *(uint32_t*)0x20000124 = 0; *(uint32_t*)0x20000128 = 0; *(uint32_t*)0x2000012c = 0; *(uint32_t*)0x20000130 = 0; *(uint32_t*)0x20000134 = 0; *(uint32_t*)0x20000138 = 0; *(uint32_t*)0x2000013c = 0; *(uint32_t*)0x20000140 = 0; *(uint32_t*)0x20000144 = 0; *(uint32_t*)0x20000148 = 0; *(uint32_t*)0x2000014c = 0; syscall(__NR_write, r[0], 0x20000100, 0x50); break; } } void loop() { execute(8); } int main() { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); loop(); return 0; }