// https://syzkaller.appspot.com/bug?id=bc574683e1e3241992f8460c82ddac937e3c88b9 // 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 #include #include #include #include #include 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 use_temporary_dir(void) { char tmpdir_template[] = "./syzkaller.XXXXXX"; char* tmpdir = mkdtemp(tmpdir_template); if (!tmpdir) exit(1); if (chmod(tmpdir, 0777)) exit(1); if (chdir(tmpdir)) exit(1); } 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; for (i = 0; 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); } #define BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off)) #define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len) \ *(type*)(addr) = \ htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) | \ (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len)))) 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); } 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_RELAXED)) 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 setup_common() { if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) { } } static void loop(); static void sandbox_common() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); setsid(); struct rlimit rlim; rlim.rlim_cur = rlim.rlim_max = (200 << 20); setrlimit(RLIMIT_AS, &rlim); rlim.rlim_cur = rlim.rlim_max = 32 << 20; setrlimit(RLIMIT_MEMLOCK, &rlim); rlim.rlim_cur = rlim.rlim_max = 136 << 20; setrlimit(RLIMIT_FSIZE, &rlim); rlim.rlim_cur = rlim.rlim_max = 1 << 20; setrlimit(RLIMIT_STACK, &rlim); rlim.rlim_cur = rlim.rlim_max = 0; setrlimit(RLIMIT_CORE, &rlim); rlim.rlim_cur = rlim.rlim_max = 256; setrlimit(RLIMIT_NOFILE, &rlim); if (unshare(CLONE_NEWNS)) { } if (unshare(CLONE_NEWIPC)) { } if (unshare(0x02000000)) { } if (unshare(CLONE_NEWUTS)) { } if (unshare(CLONE_SYSVSEM)) { } typedef struct { const char* name; const char* value; } sysctl_t; static const sysctl_t sysctls[] = { {"/proc/sys/kernel/shmmax", "16777216"}, {"/proc/sys/kernel/shmall", "536870912"}, {"/proc/sys/kernel/shmmni", "1024"}, {"/proc/sys/kernel/msgmax", "8192"}, {"/proc/sys/kernel/msgmni", "1024"}, {"/proc/sys/kernel/msgmnb", "1024"}, {"/proc/sys/kernel/sem", "1024 1048576 500 1024"}, }; unsigned i; for (i = 0; i < sizeof(sysctls) / sizeof(sysctls[0]); i++) write_file(sysctls[i].name, sysctls[i].value); } int wait_for_loop(int pid) { if (pid < 0) exit(1); int status = 0; while (waitpid(-1, &status, __WALL) != pid) { } return WEXITSTATUS(status); } static int do_sandbox_none(void) { if (unshare(CLONE_NEWPID)) { } int pid = fork(); if (pid != 0) return wait_for_loop(pid); setup_common(); sandbox_common(); if (unshare(CLONE_NEWNET)) { } loop(); exit(1); } #define FS_IOC_SETFLAGS _IOW('f', 2, long) static void remove_dir(const char* dir) { DIR* dp; struct dirent* ep; int iter = 0; retry: while (umount2(dir, MNT_DETACH) == 0) { } dp = opendir(dir); if (dp == NULL) { if (errno == EMFILE) { exit(1); } exit(1); } while ((ep = readdir(dp))) { if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0) continue; char filename[FILENAME_MAX]; snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name); while (umount2(filename, MNT_DETACH) == 0) { } struct stat st; if (lstat(filename, &st)) exit(1); if (S_ISDIR(st.st_mode)) { remove_dir(filename); continue; } int i; for (i = 0;; i++) { if (unlink(filename) == 0) break; if (errno == EPERM) { int fd = open(filename, O_RDONLY); if (fd != -1) { long flags = 0; if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) close(fd); continue; } } if (errno == EROFS) { break; } if (errno != EBUSY || i > 100) exit(1); if (umount2(filename, MNT_DETACH)) exit(1); } } closedir(dp); int i; for (i = 0;; i++) { if (rmdir(dir) == 0) break; if (i < 100) { if (errno == EPERM) { int fd = open(dir, O_RDONLY); if (fd != -1) { long flags = 0; if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) close(fd); continue; } } if (errno == EROFS) { break; } if (errno == EBUSY) { if (umount2(dir, MNT_DETACH)) exit(1); continue; } if (errno == ENOTEMPTY) { if (iter < 100) { iter++; goto retry; } } } exit(1); } } static void kill_and_wait(int pid, int* status) { kill(-pid, SIGKILL); kill(pid, SIGKILL); int i; for (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) { } } #define SYZ_HAVE_SETUP_TEST 1 static void setup_test() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); write_file("/proc/self/oom_score_adj", "1000"); } #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(void) { int i, call, thread; for (call = 0; call < 9; 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, 45); 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; for (iter = 0;; iter++) { char cwdbuf[32]; sprintf(cwdbuf, "./%d", iter); if (mkdir(cwdbuf, 0777)) exit(1); int pid = fork(); if (pid < 0) exit(1); if (pid == 0) { if (chdir(cwdbuf)) exit(1); 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_and_wait(pid, &status); break; } remove_dir(cwdbuf); } } #ifndef __NR_bpf #define __NR_bpf 321 #endif uint64_t r[1] = {0xffffffffffffffff}; void execute_call(int call) { long res; switch (call) { case 0: syscall(__NR_getsockopt, -1, 0x84, 0xa, 0, 0); break; case 1: syscall(__NR_bpf, 5, 0, 0); break; case 2: *(uint32_t*)0x20000280 = 1; *(uint32_t*)0x20000284 = 0x70; *(uint8_t*)0x20000288 = 0; *(uint8_t*)0x20000289 = 0; *(uint8_t*)0x2000028a = 0; *(uint8_t*)0x2000028b = 0; *(uint32_t*)0x2000028c = 0; *(uint64_t*)0x20000290 = 0; *(uint64_t*)0x20000298 = 0; *(uint64_t*)0x200002a0 = 0; STORE_BY_BITMASK(uint64_t, , 0x200002a8, 0, 0, 1); STORE_BY_BITMASK(uint64_t, , 0x200002a8, 0, 1, 1); STORE_BY_BITMASK(uint64_t, , 0x200002a8, 0, 2, 1); STORE_BY_BITMASK(uint64_t, , 0x200002a8, 0, 3, 1); STORE_BY_BITMASK(uint64_t, , 0x200002a8, 0, 4, 1); STORE_BY_BITMASK(uint64_t, , 0x200002a8, 0, 5, 1); STORE_BY_BITMASK(uint64_t, , 0x200002a8, 0, 6, 1); STORE_BY_BITMASK(uint64_t, , 0x200002a8, 0, 7, 1); STORE_BY_BITMASK(uint64_t, , 0x200002a8, 0, 8, 1); STORE_BY_BITMASK(uint64_t, , 0x200002a8, 0, 9, 1); STORE_BY_BITMASK(uint64_t, , 0x200002a8, 0, 10, 1); STORE_BY_BITMASK(uint64_t, , 0x200002a8, 0, 11, 1); STORE_BY_BITMASK(uint64_t, , 0x200002a8, 0, 12, 1); STORE_BY_BITMASK(uint64_t, , 0x200002a8, 0, 13, 1); STORE_BY_BITMASK(uint64_t, , 0x200002a8, 0, 14, 1); STORE_BY_BITMASK(uint64_t, , 0x200002a8, 0, 15, 2); STORE_BY_BITMASK(uint64_t, , 0x200002a8, 0, 17, 1); STORE_BY_BITMASK(uint64_t, , 0x200002a8, 0, 18, 1); STORE_BY_BITMASK(uint64_t, , 0x200002a8, 0, 19, 1); STORE_BY_BITMASK(uint64_t, , 0x200002a8, 0, 20, 1); STORE_BY_BITMASK(uint64_t, , 0x200002a8, 0, 21, 1); STORE_BY_BITMASK(uint64_t, , 0x200002a8, 0, 22, 1); STORE_BY_BITMASK(uint64_t, , 0x200002a8, 0, 23, 1); STORE_BY_BITMASK(uint64_t, , 0x200002a8, 0, 24, 1); STORE_BY_BITMASK(uint64_t, , 0x200002a8, 0, 25, 1); STORE_BY_BITMASK(uint64_t, , 0x200002a8, 0, 26, 1); STORE_BY_BITMASK(uint64_t, , 0x200002a8, 0, 27, 1); STORE_BY_BITMASK(uint64_t, , 0x200002a8, 0, 28, 1); STORE_BY_BITMASK(uint64_t, , 0x200002a8, 0, 29, 35); *(uint32_t*)0x200002b0 = 0; *(uint32_t*)0x200002b4 = 0; *(uint64_t*)0x200002b8 = 0; *(uint64_t*)0x200002c0 = 0; *(uint64_t*)0x200002c8 = 0; *(uint64_t*)0x200002d0 = 0; *(uint32_t*)0x200002d8 = 0; *(uint32_t*)0x200002dc = 0; *(uint64_t*)0x200002e0 = 0; *(uint32_t*)0x200002e8 = 0; *(uint16_t*)0x200002ec = 0; *(uint16_t*)0x200002ee = 0; res = syscall(__NR_perf_event_open, 0x20000280, -1, 0, -1, 0); if (res != -1) r[0] = res; break; case 3: *(uint32_t*)0x20000000 = 5; *(uint32_t*)0x20000004 = 0x70; *(uint8_t*)0x20000008 = 0; *(uint8_t*)0x20000009 = 0; *(uint8_t*)0x2000000a = 0; *(uint8_t*)0x2000000b = 0; *(uint32_t*)0x2000000c = 0; *(uint64_t*)0x20000010 = 0; *(uint64_t*)0x20000018 = 0; *(uint64_t*)0x20000020 = 0; STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 0, 1); STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 1, 1); STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 2, 1); STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 3, 1); STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 4, 1); STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 5, 1); STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 6, 1); STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 7, 1); STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 8, 1); STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 9, 1); STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 10, 1); STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 11, 1); STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 12, 1); STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 13, 1); STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 14, 1); STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 15, 2); STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 17, 1); STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 18, 1); STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 19, 1); STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 20, 1); STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 21, 1); STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 22, 1); STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 23, 1); STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 24, 1); STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 25, 1); STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 26, 1); STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 27, 1); STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 28, 1); STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 29, 35); *(uint32_t*)0x20000030 = 0; *(uint32_t*)0x20000034 = 2; *(uint64_t*)0x20000038 = 0; *(uint64_t*)0x20000040 = 1; *(uint64_t*)0x20000048 = 0; *(uint64_t*)0x20000050 = 0; *(uint32_t*)0x20000058 = 0; *(uint32_t*)0x2000005c = 0; *(uint64_t*)0x20000060 = 0; *(uint32_t*)0x20000068 = 0; *(uint16_t*)0x2000006c = 0; *(uint16_t*)0x2000006e = 0; syscall(__NR_perf_event_open, 0x20000000, -1, 0, r[0], 0); break; case 4: *(uint32_t*)0x200000c0 = 8; *(uint32_t*)0x200000c4 = 0x70; *(uint8_t*)0x200000c8 = 1; *(uint8_t*)0x200000c9 = 0; *(uint8_t*)0x200000ca = 0; *(uint8_t*)0x200000cb = 0; *(uint32_t*)0x200000cc = 0; *(uint64_t*)0x200000d0 = 0; *(uint64_t*)0x200000d8 = 0; *(uint64_t*)0x200000e0 = 0; STORE_BY_BITMASK(uint64_t, , 0x200000e8, 0, 0, 1); STORE_BY_BITMASK(uint64_t, , 0x200000e8, 0, 1, 1); STORE_BY_BITMASK(uint64_t, , 0x200000e8, 0, 2, 1); STORE_BY_BITMASK(uint64_t, , 0x200000e8, 0, 3, 1); STORE_BY_BITMASK(uint64_t, , 0x200000e8, 0, 4, 1); STORE_BY_BITMASK(uint64_t, , 0x200000e8, 0, 5, 1); STORE_BY_BITMASK(uint64_t, , 0x200000e8, 0, 6, 1); STORE_BY_BITMASK(uint64_t, , 0x200000e8, 0, 7, 1); STORE_BY_BITMASK(uint64_t, , 0x200000e8, 0, 8, 1); STORE_BY_BITMASK(uint64_t, , 0x200000e8, 0, 9, 1); STORE_BY_BITMASK(uint64_t, , 0x200000e8, 0, 10, 1); STORE_BY_BITMASK(uint64_t, , 0x200000e8, 0, 11, 1); STORE_BY_BITMASK(uint64_t, , 0x200000e8, 0, 12, 1); STORE_BY_BITMASK(uint64_t, , 0x200000e8, 0, 13, 1); STORE_BY_BITMASK(uint64_t, , 0x200000e8, 0, 14, 1); STORE_BY_BITMASK(uint64_t, , 0x200000e8, 0, 15, 2); STORE_BY_BITMASK(uint64_t, , 0x200000e8, 0, 17, 1); STORE_BY_BITMASK(uint64_t, , 0x200000e8, 0, 18, 1); STORE_BY_BITMASK(uint64_t, , 0x200000e8, 0, 19, 1); STORE_BY_BITMASK(uint64_t, , 0x200000e8, 0, 20, 1); STORE_BY_BITMASK(uint64_t, , 0x200000e8, 0, 21, 1); STORE_BY_BITMASK(uint64_t, , 0x200000e8, 0, 22, 1); STORE_BY_BITMASK(uint64_t, , 0x200000e8, 0, 23, 1); STORE_BY_BITMASK(uint64_t, , 0x200000e8, 0, 24, 1); STORE_BY_BITMASK(uint64_t, , 0x200000e8, 0, 25, 1); STORE_BY_BITMASK(uint64_t, , 0x200000e8, 0, 26, 1); STORE_BY_BITMASK(uint64_t, , 0x200000e8, 0, 27, 1); STORE_BY_BITMASK(uint64_t, , 0x200000e8, 0, 28, 1); STORE_BY_BITMASK(uint64_t, , 0x200000e8, 0, 29, 35); *(uint32_t*)0x200000f0 = 0; *(uint32_t*)0x200000f4 = 0; *(uint64_t*)0x200000f8 = 0; *(uint64_t*)0x20000100 = 0; *(uint64_t*)0x20000108 = 0; *(uint64_t*)0x20000110 = 0; *(uint32_t*)0x20000118 = 0; *(uint32_t*)0x2000011c = 0; *(uint64_t*)0x20000120 = 0; *(uint32_t*)0x20000128 = 0; *(uint16_t*)0x2000012c = 0; *(uint16_t*)0x2000012e = 0; syscall(__NR_perf_event_open, 0x200000c0, -1, 0, r[0], 0); break; case 5: syscall(__NR_socket, 0xa, 1, 0); break; case 6: syscall(__NR_socket, 2, 1, 0); break; case 7: syscall(__NR_ioctl, -1, 0x89e2, 0); break; case 8: syscall(__NR_close, -1); break; } } int main(void) { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); for (procid = 0; procid < 6; procid++) { if (fork() == 0) { use_temporary_dir(); do_sandbox_none(); } } sleep(1000000); return 0; }