// https://syzkaller.appspot.com/bug?id=a2c1393a92634b515391d1e54519dda3fd87e86c // autogenerated by syzkaller (http://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 #include #include #include #include #include #include #include #include #include #include #include #include __attribute__((noreturn)) static void doexit(int status) { volatile unsigned i; syscall(__NR_exit_group, status); for (i = 0;; i++) { } } #include #include #include #include #include #include #include #include #include #include const int kFailStatus = 67; const int kRetryStatus = 69; static void fail(const char* msg, ...) { int e = errno; va_list args; va_start(args, msg); vfprintf(stderr, msg, args); va_end(args); fprintf(stderr, " (errno %d)\n", e); doexit((e == ENOMEM || e == EAGAIN) ? kRetryStatus : kFailStatus); } static __thread int skip_segv; static __thread jmp_buf segv_env; static void segv_handler(int sig, siginfo_t* info, void* uctx) { uintptr_t addr = (uintptr_t)info->si_addr; const uintptr_t prog_start = 1 << 20; const uintptr_t prog_end = 100 << 20; if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) && (addr < prog_start || addr > prog_end)) { _longjmp(segv_env, 1); } doexit(sig); } static void install_segv_handler() { struct sigaction sa; memset(&sa, 0, sizeof(sa)); sa.sa_handler = SIG_IGN; syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8); syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8); memset(&sa, 0, sizeof(sa)); sa.sa_sigaction = segv_handler; sa.sa_flags = SA_NODEFER | SA_SIGINFO; sigaction(SIGSEGV, &sa, NULL); sigaction(SIGBUS, &sa, NULL); } #define NONFAILING(...) \ { \ __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST); \ if (_setjmp(segv_env) == 0) { \ __VA_ARGS__; \ } \ __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST); \ } static void use_temporary_dir() { char tmpdir_template[] = "./syzkaller.XXXXXX"; char* tmpdir = mkdtemp(tmpdir_template); if (!tmpdir) fail("failed to mkdtemp"); if (chmod(tmpdir, 0777)) fail("failed to chmod"); if (chdir(tmpdir)) fail("failed to chdir"); } static void vsnprintf_check(char* str, size_t size, const char* format, va_list args) { int rv; rv = vsnprintf(str, size, format, args); if (rv < 0) fail("tun: snprintf failed"); if ((size_t)rv >= size) fail("tun: string '%s...' doesn't fit into buffer", str); } static void snprintf_check(char* str, size_t size, const char* format, ...) { va_list args; va_start(args, format); vsnprintf_check(str, size, format, args); va_end(args); } #define COMMAND_MAX_LEN 128 #define PATH_PREFIX \ "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin " #define PATH_PREFIX_LEN (sizeof(PATH_PREFIX) - 1) static void execute_command(bool panic, const char* format, ...) { va_list args; char command[PATH_PREFIX_LEN + COMMAND_MAX_LEN]; int rv; va_start(args, format); memcpy(command, PATH_PREFIX, PATH_PREFIX_LEN); vsnprintf_check(command + PATH_PREFIX_LEN, COMMAND_MAX_LEN, format, args); rv = system(command); if (panic && rv != 0) fail("tun: command \"%s\" failed with code %d", &command[0], rv); va_end(args); } static int tunfd = -1; static int tun_frags_enabled; #define SYZ_TUN_MAX_PACKET_SIZE 1000 #define MAX_PIDS 32 #define ADDR_MAX_LEN 32 #define LOCAL_MAC "aa:aa:aa:aa:%02hx:aa" #define REMOTE_MAC "aa:aa:aa:aa:%02hx:bb" #define LOCAL_IPV4 "172.20.%d.170" #define REMOTE_IPV4 "172.20.%d.187" #define LOCAL_IPV6 "fe80::%02hx:aa" #define REMOTE_IPV6 "fe80::%02hx:bb" #define IFF_NAPI 0x0010 #define IFF_NAPI_FRAGS 0x0020 static void initialize_tun(int id) { if (id >= MAX_PIDS) fail("tun: no more than %d executors", MAX_PIDS); tunfd = open("/dev/net/tun", O_RDWR | O_NONBLOCK); if (tunfd == -1) { printf("tun: can't open /dev/net/tun: please enable CONFIG_TUN=y\n"); printf("otherwise fuzzing or reproducing might not work as intended\n"); return; } char iface[IFNAMSIZ]; snprintf_check(iface, sizeof(iface), "syz%d", id); struct ifreq ifr; memset(&ifr, 0, sizeof(ifr)); strncpy(ifr.ifr_name, iface, IFNAMSIZ); ifr.ifr_flags = IFF_TAP | IFF_NO_PI | IFF_NAPI | IFF_NAPI_FRAGS; if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0) { ifr.ifr_flags = IFF_TAP | IFF_NO_PI; if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0) fail("tun: ioctl(TUNSETIFF) failed"); } if (ioctl(tunfd, TUNGETIFF, (void*)&ifr) < 0) fail("tun: ioctl(TUNGETIFF) failed"); tun_frags_enabled = (ifr.ifr_flags & IFF_NAPI_FRAGS) != 0; char local_mac[ADDR_MAX_LEN]; snprintf_check(local_mac, sizeof(local_mac), LOCAL_MAC, id); char remote_mac[ADDR_MAX_LEN]; snprintf_check(remote_mac, sizeof(remote_mac), REMOTE_MAC, id); char local_ipv4[ADDR_MAX_LEN]; snprintf_check(local_ipv4, sizeof(local_ipv4), LOCAL_IPV4, id); char remote_ipv4[ADDR_MAX_LEN]; snprintf_check(remote_ipv4, sizeof(remote_ipv4), REMOTE_IPV4, id); char local_ipv6[ADDR_MAX_LEN]; snprintf_check(local_ipv6, sizeof(local_ipv6), LOCAL_IPV6, id); char remote_ipv6[ADDR_MAX_LEN]; snprintf_check(remote_ipv6, sizeof(remote_ipv6), REMOTE_IPV6, id); execute_command(1, "sysctl -w net.ipv6.conf.%s.accept_dad=0", iface); execute_command(1, "sysctl -w net.ipv6.conf.%s.router_solicitations=0", iface); execute_command(1, "ip link set dev %s address %s", iface, local_mac); execute_command(1, "ip addr add %s/24 dev %s", local_ipv4, iface); execute_command(1, "ip -6 addr add %s/120 dev %s", local_ipv6, iface); execute_command(1, "ip neigh add %s lladdr %s dev %s nud permanent", remote_ipv4, remote_mac, iface); execute_command(1, "ip -6 neigh add %s lladdr %s dev %s nud permanent", remote_ipv6, remote_mac, iface); execute_command(1, "ip link set dev %s up", iface); } #define DEV_IPV4 "172.20.%d.%d" #define DEV_IPV6 "fe80::%02hx:%02hx" #define DEV_MAC "aa:aa:aa:aa:%02hx:%02hx" static void initialize_netdevices(int id) { unsigned i; const char* devtypes[] = {"ip6gretap", "bridge", "vcan"}; const char* devnames[] = {"lo", "sit0", "bridge0", "vcan0", "tunl0", "gre0", "gretap0", "ip_vti0", "ip6_vti0", "ip6tnl0", "ip6gre0", "ip6gretap0", "erspan0"}; for (i = 0; i < sizeof(devtypes) / (sizeof(devtypes[0])); i++) execute_command(0, "ip link add dev %s0 type %s", devtypes[i], devtypes[i]); for (i = 0; i < sizeof(devnames) / (sizeof(devnames[0])); i++) { char addr[ADDR_MAX_LEN]; snprintf_check(addr, sizeof(addr), DEV_IPV4, id, id + 10); execute_command(0, "ip -4 addr add %s/24 dev %s", addr, devnames[i]); snprintf_check(addr, sizeof(addr), DEV_IPV6, id, id + 10); execute_command(0, "ip -6 addr add %s/120 dev %s", addr, devnames[i]); snprintf_check(addr, sizeof(addr), DEV_MAC, id, id + 10); execute_command(0, "ip link set dev %s address %s", devnames[i], addr); execute_command(0, "ip link set dev %s up", devnames[i]); } } static void setup_tun(uint64_t pid, bool enable_tun) { if (enable_tun) { initialize_tun(pid); initialize_netdevices(pid); } } 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 = 128 << 20; setrlimit(RLIMIT_AS, &rlim); rlim.rlim_cur = rlim.rlim_max = 8 << 20; setrlimit(RLIMIT_MEMLOCK, &rlim); rlim.rlim_cur = rlim.rlim_max = 1 << 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); #define CLONE_NEWCGROUP 0x02000000 if (unshare(CLONE_NEWNS)) { } if (unshare(CLONE_NEWIPC)) { } if (unshare(CLONE_NEWCGROUP)) { } if (unshare(CLONE_NEWUTS)) { } if (unshare(CLONE_SYSVSEM)) { } } 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) { close(fd); return false; } close(fd); return true; } static int real_uid; static int real_gid; __attribute__((aligned(64 << 10))) static char sandbox_stack[1 << 20]; static int namespace_sandbox_proc(void* arg) { sandbox_common(); write_file("/proc/self/setgroups", "deny"); if (!write_file("/proc/self/uid_map", "0 %d 1\n", real_uid)) fail("write of /proc/self/uid_map failed"); if (!write_file("/proc/self/gid_map", "0 %d 1\n", real_gid)) fail("write of /proc/self/gid_map failed"); if (unshare(CLONE_NEWNET)) fail("unshare(CLONE_NEWNET)"); setup_tun((long)arg >> 1, (long)arg & 1); if (mkdir("./syz-tmp", 0777)) fail("mkdir(syz-tmp) failed"); if (mount("", "./syz-tmp", "tmpfs", 0, NULL)) fail("mount(tmpfs) failed"); if (mkdir("./syz-tmp/newroot", 0777)) fail("mkdir failed"); if (mkdir("./syz-tmp/newroot/dev", 0700)) fail("mkdir failed"); unsigned mount_flags = MS_BIND | MS_REC | MS_PRIVATE; if (mount("/dev", "./syz-tmp/newroot/dev", NULL, mount_flags, NULL)) fail("mount(dev) failed"); if (mkdir("./syz-tmp/newroot/proc", 0700)) fail("mkdir failed"); if (mount(NULL, "./syz-tmp/newroot/proc", "proc", 0, NULL)) fail("mount(proc) failed"); if (mkdir("./syz-tmp/newroot/selinux", 0700)) fail("mkdir failed"); const char* selinux_path = "./syz-tmp/newroot/selinux"; if (mount("/selinux", selinux_path, NULL, mount_flags, NULL) && mount("/sys/fs/selinux", selinux_path, NULL, mount_flags, NULL)) fail("mount(selinuxfs) failed"); if (mkdir("./syz-tmp/pivot", 0777)) fail("mkdir failed"); if (syscall(SYS_pivot_root, "./syz-tmp", "./syz-tmp/pivot")) { if (chdir("./syz-tmp")) fail("chdir failed"); } else { if (chdir("/")) fail("chdir failed"); if (umount2("./pivot", MNT_DETACH)) fail("umount failed"); } if (chroot("./newroot")) fail("chroot failed"); if (chdir("/")) fail("chdir failed"); struct __user_cap_header_struct cap_hdr = {}; struct __user_cap_data_struct cap_data[2] = {}; cap_hdr.version = _LINUX_CAPABILITY_VERSION_3; cap_hdr.pid = getpid(); if (syscall(SYS_capget, &cap_hdr, &cap_data)) fail("capget failed"); cap_data[0].effective &= ~(1 << CAP_SYS_PTRACE); cap_data[0].permitted &= ~(1 << CAP_SYS_PTRACE); cap_data[0].inheritable &= ~(1 << CAP_SYS_PTRACE); if (syscall(SYS_capset, &cap_hdr, &cap_data)) fail("capset failed"); loop(); doexit(1); } static int do_sandbox_namespace(int executor_pid, bool enable_tun) { int pid; real_uid = getuid(); real_gid = getgid(); mprotect(sandbox_stack, 4096, PROT_NONE); void* arg = (void*)(long)((executor_pid << 1) | enable_tun); pid = clone(namespace_sandbox_proc, &sandbox_stack[sizeof(sandbox_stack) - 64], CLONE_NEWUSER | CLONE_NEWPID, arg); if (pid < 0) fail("sandbox clone failed"); return pid; } struct thread_t { int created, running, call; pthread_t th; }; static struct thread_t threads[16]; static void execute_call(int call); static int running; static int collide; static void* thr(void* arg) { struct thread_t* th = (struct thread_t*)arg; for (;;) { while (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) syscall(SYS_futex, &th->running, FUTEX_WAIT, 0, 0); execute_call(th->call); __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED); __atomic_store_n(&th->running, 0, __ATOMIC_RELEASE); syscall(SYS_futex, &th->running, FUTEX_WAKE); } return 0; } static void execute(int num_calls) { int call, thread; running = 0; for (call = 0; call < num_calls; call++) { for (thread = 0; thread < sizeof(threads) / sizeof(threads[0]); thread++) { struct thread_t* th = &threads[thread]; if (!th->created) { th->created = 1; pthread_attr_t attr; pthread_attr_init(&attr); pthread_attr_setstacksize(&attr, 128 << 10); pthread_create(&th->th, &attr, thr, th); } if (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) { th->call = call; __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED); __atomic_store_n(&th->running, 1, __ATOMIC_RELEASE); syscall(SYS_futex, &th->running, FUTEX_WAKE); if (collide && call % 2) break; struct timespec ts; ts.tv_sec = 0; ts.tv_nsec = 20 * 1000 * 1000; syscall(SYS_futex, &th->running, FUTEX_WAIT, 1, &ts); if (running) usleep((call == num_calls - 1) ? 10000 : 1000); break; } } } } long r[4]; void execute_call(int call) { switch (call) { case 0: syscall(__NR_mmap, 0x20000000, 0xe78000, 3, 0x32, -1, 0); break; case 1: r[0] = syscall(__NR_dup2, 0xffffff9c, -1); break; case 2: NONFAILING(memcpy( (void*)0x20f14fe0, "\x70\xcd\x65\x1a\x6b\x4d\x76\x94\x07\x66\x73\x40\xc7\xc5\x06\xe3", 16)); NONFAILING(*(uint16_t*)0x20f14ff0 = 0); syscall(__NR_ioctl, r[0], 0x8934, 0x20f14fe0); break; case 3: NONFAILING(*(uint32_t*)0x20e76000 = 0x296a1314); syscall(__NR_setsockopt, r[0], 0x11, 0x65, 0x20e76000, 4); break; case 4: NONFAILING(*(uint16_t*)0x2076afc0 = 1); NONFAILING(*(uint16_t*)0x2076afc2 = 0xa); NONFAILING(*(uint8_t*)0x2076afc4 = 0xaa); NONFAILING(*(uint8_t*)0x2076afc5 = 0xaa); NONFAILING(*(uint8_t*)0x2076afc6 = 0xaa); NONFAILING(*(uint8_t*)0x2076afc7 = 0xaa); NONFAILING(*(uint8_t*)0x2076afc8 = 0); NONFAILING(*(uint8_t*)0x2076afc9 = 0xbb); NONFAILING(*(uint8_t*)0x2076afca = 0xaa); NONFAILING(*(uint8_t*)0x2076afcb = 0xaa); NONFAILING(*(uint8_t*)0x2076afcc = 0xaa); NONFAILING(*(uint8_t*)0x2076afcd = 0xaa); NONFAILING(*(uint8_t*)0x2076afce = 0); NONFAILING(*(uint8_t*)0x2076afcf = 0x13); NONFAILING(memcpy((void*)0x2076afd0, "\x27\xe5\x53\xe4\x0b\x1e", 6)); NONFAILING(*(uint8_t*)0x2076afd6 = 0xaa); NONFAILING(*(uint8_t*)0x2076afd7 = 0xaa); NONFAILING(*(uint8_t*)0x2076afd8 = 0xaa); NONFAILING(*(uint8_t*)0x2076afd9 = 0xaa); NONFAILING(*(uint8_t*)0x2076afda = 0); NONFAILING(*(uint8_t*)0x2076afdb = 0xd); NONFAILING(*(uint8_t*)0x2076afdc = -1); NONFAILING(*(uint8_t*)0x2076afdd = -1); NONFAILING(*(uint8_t*)0x2076afde = -1); NONFAILING(*(uint8_t*)0x2076afdf = -1); NONFAILING(*(uint8_t*)0x2076afe0 = -1); NONFAILING(*(uint8_t*)0x2076afe1 = -1); NONFAILING(*(uint8_t*)0x2076afe2 = 1); NONFAILING(*(uint8_t*)0x2076afe3 = 0x80); NONFAILING(*(uint8_t*)0x2076afe4 = 0xc2); NONFAILING(*(uint8_t*)0x2076afe5 = 0); NONFAILING(*(uint8_t*)0x2076afe6 = 0); NONFAILING(*(uint8_t*)0x2076afe7 = 0); NONFAILING(*(uint8_t*)0x2076afe8 = 0xaa); NONFAILING(*(uint8_t*)0x2076afe9 = 0xaa); NONFAILING(*(uint8_t*)0x2076afea = 0xaa); NONFAILING(*(uint8_t*)0x2076afeb = 0xaa); NONFAILING(*(uint8_t*)0x2076afec = 0); NONFAILING(*(uint8_t*)0x2076afed = 0xaa); NONFAILING(memcpy((void*)0x2076afee, "\x03\xb3\xcc\xc0\x69\x5a", 6)); NONFAILING(*(uint8_t*)0x2076aff4 = 0xaa); NONFAILING(*(uint8_t*)0x2076aff5 = 0xaa); NONFAILING(*(uint8_t*)0x2076aff6 = 0xaa); NONFAILING(*(uint8_t*)0x2076aff7 = 0xaa); NONFAILING(*(uint8_t*)0x2076aff8 = 0); NONFAILING(*(uint8_t*)0x2076aff9 = 0xbb); NONFAILING(*(uint8_t*)0x2076affa = -1); NONFAILING(*(uint8_t*)0x2076affb = -1); NONFAILING(*(uint8_t*)0x2076affc = -1); NONFAILING(*(uint8_t*)0x2076affd = -1); NONFAILING(*(uint8_t*)0x2076affe = -1); NONFAILING(*(uint8_t*)0x2076afff = -1); syscall(__NR_ioctl, r[0], 0x400454d1, 0x2076afc0); break; case 5: r[1] = syscall(__NR_socket, 0xa, 2, 0); break; case 6: r[2] = syscall(__NR_socket, 0x18, 1, 1); break; case 7: NONFAILING(*(uint16_t*)0x20e71000 = 0x18); NONFAILING(*(uint32_t*)0x20e71002 = 1); NONFAILING(*(uint32_t*)0x20e71006 = 0); NONFAILING(*(uint32_t*)0x20e7100a = r[1]); NONFAILING(*(uint16_t*)0x20e7100e = 3); NONFAILING(*(uint16_t*)0x20e71010 = 0); NONFAILING(*(uint16_t*)0x20e71012 = 3); NONFAILING(*(uint16_t*)0x20e71014 = 0); NONFAILING(*(uint16_t*)0x20e71016 = 0xa); NONFAILING(*(uint16_t*)0x20e71018 = htobe16(0x4e22)); NONFAILING(*(uint32_t*)0x20e7101a = 3); NONFAILING(*(uint8_t*)0x20e7101e = 0xfe); NONFAILING(*(uint8_t*)0x20e7101f = 0x80); NONFAILING(*(uint8_t*)0x20e71020 = 0); NONFAILING(*(uint8_t*)0x20e71021 = 0); NONFAILING(*(uint8_t*)0x20e71022 = 0); NONFAILING(*(uint8_t*)0x20e71023 = 0); NONFAILING(*(uint8_t*)0x20e71024 = 0); NONFAILING(*(uint8_t*)0x20e71025 = 0); NONFAILING(*(uint8_t*)0x20e71026 = 0); NONFAILING(*(uint8_t*)0x20e71027 = 0); NONFAILING(*(uint8_t*)0x20e71028 = 0); NONFAILING(*(uint8_t*)0x20e71029 = 0); NONFAILING(*(uint8_t*)0x20e7102a = 0); NONFAILING(*(uint8_t*)0x20e7102b = 0); NONFAILING(*(uint8_t*)0x20e7102c = 0); NONFAILING(*(uint8_t*)0x20e7102d = 0xbb); NONFAILING(*(uint32_t*)0x20e7102e = 4); syscall(__NR_connect, r[2], 0x20e71000, 0x32); break; case 8: NONFAILING(memcpy((void*)0x20e77fef, "/selinux/relabel", 17)); syscall(__NR_openat, 0xffffffffffffff9c, 0x20e77fef, 2, 0); break; case 9: r[3] = syscall(__NR_socket, 0x18, 1, 1); break; case 10: syscall(__NR_socket, 0xa, 4, 7); break; case 11: syscall(__NR_close, r[1]); break; case 12: syscall(__NR_dup2, r[3], r[2]); break; } } void loop() { memset(r, -1, sizeof(r)); execute(13); collide = 1; execute(13); } int main() { install_segv_handler(); use_temporary_dir(); int pid = do_sandbox_namespace(0, true); int status = 0; while (waitpid(pid, &status, __WALL) != pid) { } return 0; }