// https://syzkaller.appspot.com/bug?id=3c27eae7bdba97293b68e79c9700ac110f977eed // autogenerated by syzkaller (https://github.com/google/syzkaller) #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include #include #include #include static void sleep_ms(uint64_t ms) { usleep(ms * 1000); } static uint64_t current_time_ms() { struct timespec ts; if (clock_gettime(CLOCK_MONOTONIC, &ts)) exit(1); return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000; } static void thread_start(void* (*fn)(void*), void* arg) { pthread_t th; pthread_attr_t attr; pthread_attr_init(&attr); pthread_attr_setstacksize(&attr, 128 << 10); if (pthread_create(&th, &attr, fn, arg)) exit(1); pthread_attr_destroy(&attr); } typedef struct { int state; } event_t; static void event_init(event_t* ev) { ev->state = 0; } static void event_reset(event_t* ev) { ev->state = 0; } static void event_set(event_t* ev) { if (ev->state) exit(1); __atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE); syscall(SYS_futex, &ev->state, FUTEX_WAKE); } static void event_wait(event_t* ev) { while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE)) syscall(SYS_futex, &ev->state, FUTEX_WAIT, 0, 0); } static int event_isset(event_t* ev) { return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE); } static int event_timedwait(event_t* ev, uint64_t timeout) { uint64_t start = current_time_ms(); uint64_t now = start; for (;;) { uint64_t remain = timeout - (now - start); struct timespec ts; ts.tv_sec = remain / 1000; ts.tv_nsec = (remain % 1000) * 1000 * 1000; syscall(SYS_futex, &ev->state, FUTEX_WAIT, 0, &ts); if (__atomic_load_n(&ev->state, __ATOMIC_RELAXED)) return 1; now = current_time_ms(); if (now - start > timeout) return 0; } } #define SYZ_HAVE_SETUP_TEST 1 static void setup_test() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); } #define SYZ_HAVE_RESET_TEST 1 static void reset_test() { int fd; for (fd = 3; fd < 30; fd++) close(fd); } struct thread_t { int created, call; event_t ready, done; }; 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 (;;) { event_wait(&th->ready); event_reset(&th->ready); execute_call(th->call); __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED); event_set(&th->done); } return 0; } static void execute_one() { int call, thread; for (call = 0; call < 7; call++) { for (thread = 0; thread < sizeof(threads) / sizeof(threads[0]); thread++) { struct thread_t* th = &threads[thread]; if (!th->created) { th->created = 1; event_init(&th->ready); event_init(&th->done); event_set(&th->done); thread_start(thr, th); } if (!event_isset(&th->done)) continue; event_reset(&th->done); th->call = call; __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED); event_set(&th->ready); event_timedwait(&th->done, 25); if (__atomic_load_n(&running, __ATOMIC_RELAXED)) sleep_ms((call == 7 - 1) ? 10 : 2); break; } } } static void execute_one(); #define WAIT_FLAGS __WALL static void loop() { int iter; for (iter = 0;; iter++) { int pid = fork(); if (pid < 0) exit(1); if (pid == 0) { setup_test(); execute_one(); reset_test(); exit(0); } int status = 0; uint64_t start = current_time_ms(); for (;;) { if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) break; sleep_ms(1); if (current_time_ms() - start < 5 * 1000) continue; kill(-pid, SIGKILL); kill(pid, SIGKILL); while (waitpid(-1, &status, WAIT_FLAGS) != pid) { } break; } } } uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; void execute_call(int call) { long res; switch (call) { case 0: res = syscall(__NR_socket, 0xa, 2, 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]; *(uint16_t*)0x2000008e = 2; *(uint16_t*)0x20000090 = htobe16(0); *(uint32_t*)0x20000092 = htobe32(0xe0000002); *(uint8_t*)0x20000096 = 0; *(uint8_t*)0x20000097 = 0; *(uint8_t*)0x20000098 = 0; *(uint8_t*)0x20000099 = 0; *(uint8_t*)0x2000009a = 0; *(uint8_t*)0x2000009b = 0; *(uint8_t*)0x2000009c = 0; *(uint8_t*)0x2000009d = 0; *(uint32_t*)0x2000009e = 4; *(uint32_t*)0x200000a2 = 0; *(uint32_t*)0x200000a6 = 0; *(uint32_t*)0x200000aa = 0; syscall(__NR_connect, r[1], 0x20000080, 0x2e); break; case 3: res = syscall(__NR_socket, 0x18, 1, 1); if (res != -1) r[2] = res; break; case 4: *(uint16_t*)0x20000180 = 0x18; *(uint32_t*)0x20000182 = 1; *(uint32_t*)0x20000186 = 0; *(uint32_t*)0x2000018a = -1; *(uint16_t*)0x2000018e = 2; *(uint16_t*)0x20000190 = htobe16(0); *(uint32_t*)0x20000192 = htobe32(0xe0000001); *(uint8_t*)0x20000196 = 0; *(uint8_t*)0x20000197 = 0; *(uint8_t*)0x20000198 = 0; *(uint8_t*)0x20000199 = 0; *(uint8_t*)0x2000019a = 0; *(uint8_t*)0x2000019b = 0; *(uint8_t*)0x2000019c = 0; *(uint8_t*)0x2000019d = 0; *(uint32_t*)0x2000019e = 4; *(uint32_t*)0x200001a2 = 8; *(uint32_t*)0x200001a6 = 0; *(uint32_t*)0x200001aa = 0; syscall(__NR_connect, r[2], 0x20000180, 0x2e); break; case 5: syscall(__NR_close, r[0]); break; case 6: syscall(__NR_close, r[2]); break; } } int main() { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); loop(); return 0; }