// https://syzkaller.appspot.com/bug?id=4aeceeb1204dfc6707f976a7a702e18b773b26f6 // 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 #include #include #include #include #include #include static void sleep_ms(uint64_t ms) { usleep(ms * 1000); } static uint64_t current_time_ms(void) { 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); int i = 0; for (; i < 100; i++) { if (pthread_create(&th, &attr, fn, arg) == 0) { pthread_attr_destroy(&attr); return; } if (errno == EAGAIN) { usleep(50); continue; } break; } exit(1); } 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 | FUTEX_PRIVATE_FLAG, 1000000); } static void event_wait(event_t* ev) { while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE)) syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 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 | FUTEX_PRIVATE_FLAG, 0, &ts); if (__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE)) return 1; now = current_time_ms(); if (now - start > timeout) return 0; } } static bool write_file(const char* file, const char* what, ...) { char buf[1024]; va_list args; va_start(args, what); vsnprintf(buf, sizeof(buf), what, args); va_end(args); buf[sizeof(buf) - 1] = 0; int len = strlen(buf); int fd = open(file, O_WRONLY | O_CLOEXEC); if (fd == -1) return false; if (write(fd, buf, len) != len) { int err = errno; close(fd); errno = err; return false; } close(fd); return true; } static void kill_and_wait(int pid, int* status) { kill(-pid, SIGKILL); kill(pid, SIGKILL); for (int i = 0; i < 100; i++) { if (waitpid(-1, status, WNOHANG | __WALL) == pid) return; usleep(1000); } DIR* dir = opendir("/sys/fs/fuse/connections"); if (dir) { for (;;) { struct dirent* ent = readdir(dir); if (!ent) break; if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0) continue; char abort[300]; snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort", ent->d_name); int fd = open(abort, O_WRONLY); if (fd == -1) { continue; } if (write(fd, abort, 1) < 0) { } close(fd); } closedir(dir); } else { } while (waitpid(-1, status, __WALL) != pid) { } } static void setup_test() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); write_file("/proc/self/oom_score_adj", "1000"); } 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(void) { int i, call, thread; for (call = 0; call < 5; call++) { for (thread = 0; thread < (int)(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); if (call == 3) break; event_timedwait(&th->done, 50); break; } } for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++) sleep_ms(1); } static void execute_one(void); #define WAIT_FLAGS __WALL static void loop(void) { int iter = 0; for (;; iter++) { int pid = fork(); if (pid < 0) exit(1); if (pid == 0) { setup_test(); execute_one(); 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 < 5000) continue; kill_and_wait(pid, &status); break; } } } uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff}; void execute_call(int call) { intptr_t res = 0; switch (call) { case 0: res = syscall(__NR_socketpair, 0x1eul, 1ul, 0, 0x20000140ul); if (res != -1) { r[0] = *(uint32_t*)0x20000140; r[1] = *(uint32_t*)0x20000144; } break; case 1: *(uint64_t*)0x20000480 = 0; *(uint32_t*)0x20000488 = 0; *(uint64_t*)0x20000490 = 0x20000380; *(uint64_t*)0x20000498 = 0x10000023; *(uint64_t*)0x200004a0 = 0x200002c0; *(uint64_t*)0x200004a8 = 0x42e; *(uint32_t*)0x200004b0 = 0; syscall(__NR_recvmsg, -1, 0x20000480ul, 0ul, 0); break; case 2: *(uint64_t*)0x200001c0 = 0; *(uint32_t*)0x200001c8 = 0x17; *(uint64_t*)0x200001d0 = 0x20000400; *(uint64_t*)0x20000400 = 0x20000340; memcpy( (void*)0x20000340, "\x4f\x15\xa3\x9a\x2d\xf4\x3b\x14\xed\x5f\x2c\x57\x8d\x4d\xb0\x55\xee" "\x07\xf5\xa3\xd8\x02\xcf\x8b\x50\xb4\xe7\xdf\x21\xe1\x8c\xb5\xfc\x59" "\x56\x9f\x9e\x04\x8c\x63\x43\xd4\xd9\x3a\x8d\xe6\x16\x54\xae\xa6\x0f" "\x37\xd0\x07\x26\xbb\xba\xf8\x41\x3f\xa3\x5f\x71\x1e\x8e\xbd\x6b\x86" "\xb0\xd0\x49\xac\x43\xde\x63\xad\x10\xd2\x51\xb4\xfd\xb1\x4d\x20\x70" "\x6d\x04\x2b\x10\x38\x4f\xce\x5e\xc5\x62\xf8\x0e\xea\x29\x46\xc9\xcf" "\xc7\xf1\x07\x83\x25\x73\x25\x82\xaf\x6d\xa3\x54\x42\xdf\xad\xaa\xcf" "\x63\x64\x3c\x41\xa7\xe5\xf8\x82\xe0\x90\x16\xd4\x6b\x27\x73\x97\x51" "\xf7\xcb\x3c\x97\x47\xd0\x87\x91\x9a\x9c\xe3\xb1\x3b\x0c\x9a\x27\x74" "\xa5\x4d\x8d\x5a\x2c\x50\x53\xac\x2e\xeb\xb1\x4c\xad", 166); *(uint64_t*)0x20000408 = 0; *(uint64_t*)0x20000410 = 0x20000240; memcpy( (void*)0x20000240, "\xae\x61\xa8\xd1\x92\x17\x14\x09\xdc\x2c\x19\x80\x9c\xe7\x0f\x90\xc6" "\x1b\x40\x2d\x89\x90\x6f\x87\x6f\xbb\x89\x19\x6f\xa5\x7c\x9d\xd7\xed" "\x6f\xe7\x3d\x4a\x9a\x05\x0d\x32\x41\x6a\x7e\x62\x2c\x1c\x99\x43\xab" "\x04\xd4\xe7\xdb\x15\x46\xfa\xb9\x43\xd9\x5d\x0a\x70\x57\x45\x9e\x2d" "\x58\xc8\x3e\x7f\x97\xdd\xda\x17\xb3\xaf\xf6\x7e\xfc\x92\xf8\x73\xb9" "\x0a\x00\xb5\xd3\xc8\x22\x63\x57\xfc\x7d\xce\x76\xf9\xcc\xb0\xc7\x57" "\xe1\xf3\xf3\xd7\x7a\xb2\xc3\x82\xb1\xf4\x74\xdb\xfc\x9f", 116); *(uint64_t*)0x20000418 = 0; *(uint64_t*)0x200001d8 = 0x47; *(uint64_t*)0x200001e0 = 0x20000000; *(uint64_t*)0x200001e8 = 0; *(uint32_t*)0x200001f0 = 0xb9efff7f; syscall(__NR_sendmsg, r[1], 0x200001c0ul, 0ul); break; case 3: *(uint64_t*)0x20000200 = 0x20000040; *(uint32_t*)0x20000208 = 0xfe76; *(uint64_t*)0x20000210 = 0x20000000; *(uint64_t*)0x20000000 = 0x20000080; *(uint64_t*)0x20000008 = 0x2644e0; *(uint64_t*)0x20000218 = 1; *(uint64_t*)0x20000220 = 0x200001c0; *(uint64_t*)0x20000228 = 0x10080; *(uint32_t*)0x20000230 = 0x7301; syscall(__NR_recvmsg, r[0], 0x20000200ul, 0x3f9cul, 0); break; case 4: *(uint64_t*)0x200001c0 = 0; *(uint32_t*)0x200001c8 = 0; *(uint64_t*)0x200001d0 = 0; *(uint64_t*)0x200001d8 = 0; *(uint64_t*)0x200001e0 = 0; *(uint64_t*)0x200001e8 = 0; *(uint32_t*)0x200001f0 = 0xb9efff7f; syscall(__NR_sendmsg, r[1], 0x200001c0ul, 0ul); break; } } int main(void) { syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul); syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul); syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul); loop(); return 0; }