// https://syzkaller.appspot.com/bug?id=fa6f8101b681771ea2e1247f70fd55e385110222 // 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 int inject_fault(int nth) { int fd; fd = open("/proc/thread-self/fail-nth", O_RDWR); if (fd == -1) exit(1); char buf[16]; sprintf(buf, "%d", nth); if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf)) exit(1); return fd; } 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"); } static void setup_fault() { static struct { const char* file; const char* val; bool fatal; } files[] = { {"/sys/kernel/debug/failslab/ignore-gfp-wait", "N", true}, {"/sys/kernel/debug/fail_futex/ignore-private", "N", false}, {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-highmem", "N", false}, {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-wait", "N", false}, {"/sys/kernel/debug/fail_page_alloc/min-order", "0", false}, }; unsigned i; for (i = 0; i < sizeof(files) / sizeof(files[0]); i++) { if (!write_file(files[i].file, files[i].val)) { if (files[i].fatal) exit(1); } } } 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 < 7; 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); 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[1] = {0xffffffffffffffff}; void execute_call(int call) { intptr_t res = 0; switch (call) { case 0: res = syscall(__NR_socket, 0xaul, 1ul, 0); if (res != -1) r[0] = res; break; case 1: *(uint64_t*)0x200043c0 = 0; *(uint32_t*)0x200043c8 = 0; *(uint64_t*)0x200043d0 = 0x20000400; *(uint64_t*)0x20000400 = 0x20000180; *(uint64_t*)0x20000408 = 0x47; *(uint64_t*)0x20000410 = 0x20000240; *(uint64_t*)0x20000418 = 0x62; *(uint64_t*)0x20000420 = 0x200002c0; *(uint64_t*)0x20000428 = 0x16; *(uint64_t*)0x20000430 = 0x20000300; *(uint64_t*)0x20000438 = 0xe0; *(uint64_t*)0x200043d8 = 4; *(uint64_t*)0x200043e0 = 0; *(uint64_t*)0x200043e8 = 0; *(uint32_t*)0x200043f0 = 0; *(uint32_t*)0x200043f8 = 0; *(uint64_t*)0x20004400 = 0; *(uint32_t*)0x20004408 = 0; *(uint64_t*)0x20004410 = 0x20000800; *(uint64_t*)0x20000800 = 0x20000700; *(uint64_t*)0x20000808 = 0xcc; *(uint64_t*)0x20004418 = 1; *(uint64_t*)0x20004420 = 0; *(uint64_t*)0x20004428 = 0; *(uint32_t*)0x20004430 = 0; *(uint32_t*)0x20004438 = 0; *(uint64_t*)0x20004440 = 0; *(uint32_t*)0x20004448 = 0; *(uint64_t*)0x20004450 = 0x20000a00; *(uint64_t*)0x20000a00 = 0x20000940; *(uint64_t*)0x20000a08 = 2; *(uint64_t*)0x20000a10 = 0x20000980; *(uint64_t*)0x20000a18 = 0x32; *(uint64_t*)0x20000a20 = 0x200009c0; *(uint64_t*)0x20000a28 = 4; *(uint64_t*)0x20004458 = 3; *(uint64_t*)0x20004460 = 0; *(uint64_t*)0x20004468 = 0; *(uint32_t*)0x20004470 = 0; *(uint32_t*)0x20004478 = 0; *(uint64_t*)0x20004480 = 0; *(uint32_t*)0x20004488 = 0; *(uint64_t*)0x20004490 = 0x20000c40; *(uint64_t*)0x20000c40 = 0x20000b80; *(uint64_t*)0x20000c48 = 0x3b; *(uint64_t*)0x20000c50 = 0x20000bc0; *(uint64_t*)0x20000c58 = 0x53; *(uint64_t*)0x20000c60 = 0x200013c0; *(uint64_t*)0x20000c68 = 0x1000; *(uint64_t*)0x20004498 = 3; *(uint64_t*)0x200044a0 = 0; *(uint64_t*)0x200044a8 = 0; *(uint32_t*)0x200044b0 = 0; *(uint32_t*)0x200044b8 = 0; *(uint64_t*)0x200044c0 = 0; *(uint32_t*)0x200044c8 = 0; *(uint64_t*)0x200044d0 = 0x20000f00; *(uint64_t*)0x20000f00 = 0x20000dc0; *(uint64_t*)0x20000f08 = 0x3d; *(uint64_t*)0x20000f10 = 0x20000e00; *(uint64_t*)0x20000f18 = 0xe6; *(uint64_t*)0x200044d8 = 2; *(uint64_t*)0x200044e0 = 0; *(uint64_t*)0x200044e8 = 0; *(uint32_t*)0x200044f0 = 0; *(uint32_t*)0x200044f8 = 0; *(uint64_t*)0x20004500 = 0; *(uint32_t*)0x20004508 = 0; *(uint64_t*)0x20004510 = 0x200012c0; *(uint64_t*)0x200012c0 = 0x200023c0; *(uint64_t*)0x200012c8 = 0x1000; *(uint64_t*)0x200012d0 = 0x200010c0; *(uint64_t*)0x200012d8 = 0x5c; *(uint64_t*)0x20004518 = 2; *(uint64_t*)0x20004520 = 0; *(uint64_t*)0x20004528 = 0; *(uint32_t*)0x20004530 = 0; *(uint32_t*)0x20004538 = 0; syscall(__NR_recvmmsg, -1, 0x200043c0ul, 6ul, 0ul, 0ul); break; case 2: *(uint32_t*)0x20000000 = 1; syscall(__NR_setsockopt, r[0], 6, 0x13, 0x20000000ul, 4ul); break; case 3: *(uint16_t*)0x20000200 = 0xa; *(uint16_t*)0x20000202 = htobe16(0); *(uint32_t*)0x20000204 = htobe32(0); memset((void*)0x20000208, 0, 16); *(uint32_t*)0x20000218 = 0; syscall(__NR_connect, r[0], 0x20000200ul, 0x1cul); break; case 4: memcpy((void*)0x20000540, "tls\000", 4); syscall(__NR_setsockopt, r[0], 6, 0x1f, 0x20000540ul, 4ul); break; case 5: *(uint16_t*)0x20000040 = 0x303; *(uint16_t*)0x20000042 = 0x33; memcpy((void*)0x20000044, "\x2e\x99\x16\x92\x00\x20\xb9\xad", 8); memcpy((void*)0x2000004c, "\x53\x49\x9a\xdd\xa3\x7e\x5c\x14\x26\x5f\x29\x8f\x9f\x57\x22\xd7", 16); memset((void*)0x2000005c, 0, 4); memcpy((void*)0x20000060, "\xc7\x91\xd3\x43\x04\xbb\x24\xeb", 8); syscall(__NR_setsockopt, r[0], 0x11a, 1, 0x20000040ul, 0x28ul); break; case 6: *(uint64_t*)0x20000080 = 0x200000c0; memset((void*)0x200000c0, 207, 1); *(uint64_t*)0x20000088 = 1; inject_fault(4); syscall(__NR_writev, r[0], 0x20000080ul, 0x27ful); 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); setup_fault(); loop(); return 0; }