// https://syzkaller.appspot.com/bug?id=ce7f62081890c7f1aff3378c852205789ca55782 // autogenerated by syzkaller (http://github.com/google/syzkaller) #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include #include static uintptr_t syz_open_procfs(uintptr_t a0, uintptr_t a1) { char buf[128]; memset(buf, 0, sizeof(buf)); if (a0 == 0) { snprintf(buf, sizeof(buf), "/proc/self/%s", (char*)a1); } else if (a0 == (uintptr_t)-1) { snprintf(buf, sizeof(buf), "/proc/thread-self/%s", (char*)a1); } else { snprintf(buf, sizeof(buf), "/proc/self/task/%d/%s", (int)a0, (char*)a1); } int fd = open(buf, O_RDWR); if (fd == -1) fd = open(buf, O_RDONLY); return fd; } 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 (running) usleep((call == num_calls - 1) ? 10000 : 1000); break; } } } } uint64_t r[5] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; unsigned long long procid; void execute_call(int call) { long res; switch (call) { case 0: memcpy((void*)0x20000100, "\x2f\x65\x78\x65\x00\x00\x00\x00\x00\x04\x09\x00\x4b\xdd\xd9\xf1" "\x91\xbe\x10\xee\xbf\x00\x0e\xe9\xff\x07\x00\x00\x00\x00\x00\x00" "\x54\xfa\x07\x42\x4a\xde\xe9\x16\xd2\xda\x75\xaf\xe7\x0b\x35\xa0" "\xfd\x6a\x1f\x02\x00\xf5\xab\x26\xd7\xa0\x71\xfb\x35\x33\x1c\xe3" "\x9c\x5a\x65\x68\x64\x10\x72\x1e\xe2\xdb\x6a\x74\xe3\x33\x26\x53", 80); res = syz_open_procfs(0, 0x20000100); if (res != -1) r[0] = res; break; case 1: syscall(__NR_fcntl, r[0], 4, 0x5ffe); break; case 2: memcpy((void*)0x20000100, "./cgroup.cpu", 13); res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000100, 0x200002, 0); if (res != -1) r[1] = res; break; case 3: syscall(__NR_fchdir, r[1]); break; case 4: memcpy((void*)0x20000700, "./bus", 6); res = syscall(__NR_creat, 0x20000700, 0); if (res != -1) r[2] = res; break; case 5: syscall(__NR_sendfile, r[2], r[0], 0, 6); break; case 6: syscall(__NR_fcntl, r[2], 4, 0x6100); break; case 7: syscall(__NR_ftruncate, r[2], 0x48204); break; case 8: memcpy((void*)0x2000fffa, "./bus", 6); res = syscall(__NR_open, 0x2000fffa, 0x141042, 0); if (res != -1) r[3] = res; break; case 9: syscall(__NR_mmap, 0x20001000, 0xa000, 0x800002, 0x11, r[3], 0); break; case 10: memcpy((void*)0x20000000, "./bus", 6); res = syscall(__NR_open, 0x20000000, 0, 0); if (res != -1) r[4] = res; break; case 11: *(uint64_t*)0x20d83ff8 = 0; syscall(__NR_sendfile, r[2], r[4], 0x20d83ff8, 0x8000fffffffe); break; case 12: syscall(__NR_pread64, r[0], 0x20002000, 0xfffffd80, 0); break; } } void execute_one() { execute(13); } 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; }