// https://syzkaller.appspot.com/bug?id=4aa4ac47afdabcafecf928c8c6eb43ccddce4e77 // 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 unsigned long long procid; 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 < 10; 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 == 7) 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[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; void execute_call(int call) { intptr_t res = 0; switch (call) { case 0: res = syscall(__NR_socket, /*domain=*/0xaul, /*type=*/6ul, /*proto=*/0); if (res != -1) r[0] = res; break; case 1: *(uint16_t*)0x20000000 = 0xa; *(uint16_t*)0x20000002 = htobe16(0x4e20); *(uint32_t*)0x20000004 = htobe32(0); memset((void*)0x20000008, 0, 16); *(uint32_t*)0x20000018 = 0; syscall(__NR_bind, /*fd=*/r[0], /*addr=*/0x20000000ul, /*addrlen=*/0x1cul); break; case 2: res = syscall(__NR_socket, /*domain=*/2ul, /*type=*/6ul, /*proto=*/0); if (res != -1) r[1] = res; break; case 3: syscall(__NR_listen, /*fd=*/r[0], /*backlog=*/6); break; case 4: memset((void*)0x201c9fff, 3, 1); syscall(__NR_setsockopt, /*fd=*/r[1], /*level=*/0x10d, /*optname=*/0xd, /*optval=*/0x201c9ffful, /*optlen=*/1ul); break; case 5: *(uint16_t*)0x20e5c000 = 2; *(uint16_t*)0x20e5c002 = htobe16(0x4e20); *(uint32_t*)0x20e5c004 = htobe32(0); syscall(__NR_connect, /*fd=*/r[1], /*addr=*/0x20e5c000ul, /*addrlen=*/0x10ul); break; case 6: res = syscall(__NR_accept, /*fd=*/r[0], /*peer=*/0ul, /*peerlen=*/0ul); if (res != -1) r[2] = res; break; case 7: *(uint64_t*)0x20000400 = 0; *(uint32_t*)0x20000408 = 0; *(uint64_t*)0x20000410 = 0x20000300; *(uint64_t*)0x20000300 = 0x20000200; *(uint64_t*)0x20000308 = 3; *(uint64_t*)0x20000418 = 1; *(uint64_t*)0x20000420 = 0; *(uint64_t*)0x20000428 = 0; *(uint32_t*)0x20000430 = 0x400c0; syscall(__NR_sendmsg, /*fd=*/r[2], /*msg=*/0x20000400ul, /*f=*/0x40000ul); { int i; for (i = 0; i < 64; i++) { syscall(__NR_sendmsg, /*fd=*/r[2], /*msg=*/0x20000400ul, /*f=*/0x40000ul); } } break; case 8: syscall(__NR_ioctl, /*fd=*/-1, /*cmd=*/0x4004560e, /*arg=*/0ul); break; case 9: *(uint64_t*)0x20000580 = 0; *(uint32_t*)0x20000588 = 0; *(uint64_t*)0x20000590 = 0x20000140; *(uint64_t*)0x20000140 = 0x20000640; memcpy((void*)0x20000640, "\x0b\x2a\x68\xc1\xec\x35\x6b\x95\x1c\xc8\x8f\x8a\xfc\xff\x93\xf5" "\x87\x0d\x26\xfd\xbe\x8a\xce\xd0\x0d\xb8\x42\xd7\x8e\xbe\x5f\x2c" "\x63\xee\xa1\x8d\xd0\x32\x00\xeb\xe8\xb4\x13\x2b\x7d\x2b\x06\xdb" "\xf7\x89\xd4\xfe\x48\x0a\xe9\x2d\xdf\x36\xfc\x47\x17\x2e\xa4\xdc" "\xb9\x5b\x6c\xf5\xef\x14\x44\xe0\x1c\xc6\xd7\x73\xd9\xd0\x24\x9e" "\xe8\x90\xcc\x08\xba\xf1\x20\xa2\x82\x90\x27\x99\xd2\x35\x0b\x25" "\x2c\xd8\x9c\x1e\x5b\xc8\xa6\xfd\x91\x37\x84\x7c\x7b\xc5\x78\x9d" "\xf1\x29\x77\x88\xa0\x96\xa2\xa5\xb3\x87\xb1\xb0\xe0\xf6\x86\xf2" "\x16\x00\x77\xfa\x03\x2d\x01\x33\xaa\x59\x99\xfd\xd5", 141); *(uint64_t*)0x20000148 = 0x8d; *(uint64_t*)0x20000598 = 1; *(uint64_t*)0x200005a0 = 0; *(uint64_t*)0x200005a8 = 0; *(uint32_t*)0x200005b0 = 0; *(uint32_t*)0x200005b8 = 0; *(uint64_t*)0x200005c0 = 0; *(uint32_t*)0x200005c8 = 0; *(uint64_t*)0x200005d0 = 0; *(uint64_t*)0x200005d8 = 0; *(uint64_t*)0x200005e0 = 0; *(uint64_t*)0x200005e8 = 0; *(uint32_t*)0x200005f0 = 0; *(uint32_t*)0x200005f8 = 0; syscall(__NR_sendmmsg, /*fd=*/r[1], /*mmsg=*/0x20000580ul, /*vlen=*/2ul, /*f=*/0x4854ul); break; } } int main(void) { syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=*/7ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul); for (procid = 0; procid < 4; procid++) { if (fork() == 0) { loop(); } } sleep(1000000); return 0; }