| // WARNING: ODEBUG bug in tipc_enable_bearer |
| // https://syzkaller.appspot.com/bug?id=a8f0cc015622f70b9462386150b79ccc06808872 |
| // status:fixed |
| // autogenerated by syzkaller (https://github.com/google/syzkaller) |
| |
| #define _GNU_SOURCE |
| |
| #include <arpa/inet.h> |
| #include <endian.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <net/if_arp.h> |
| #include <sched.h> |
| #include <stdarg.h> |
| #include <stdbool.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/ioctl.h> |
| #include <sys/mount.h> |
| #include <sys/prctl.h> |
| #include <sys/resource.h> |
| #include <sys/socket.h> |
| #include <sys/stat.h> |
| #include <sys/syscall.h> |
| #include <sys/time.h> |
| #include <sys/types.h> |
| #include <sys/uio.h> |
| #include <sys/wait.h> |
| #include <unistd.h> |
| |
| #include <linux/genetlink.h> |
| #include <linux/if.h> |
| #include <linux/if_ether.h> |
| #include <linux/if_tun.h> |
| #include <linux/ip.h> |
| #include <linux/netlink.h> |
| #include <linux/tcp.h> |
| |
| 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) |
| exit(1); |
| if ((size_t)rv >= size) |
| exit(1); |
| } |
| |
| #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); |
| va_end(args); |
| rv = system(command); |
| if (rv) { |
| if (panic) |
| exit(1); |
| } |
| } |
| |
| static int tunfd = -1; |
| static int tun_frags_enabled; |
| #define SYZ_TUN_MAX_PACKET_SIZE 1000 |
| |
| #define TUN_IFACE "syz_tun" |
| |
| #define LOCAL_MAC "aa:aa:aa:aa:aa:aa" |
| #define REMOTE_MAC "aa:aa:aa:aa:aa:bb" |
| |
| #define LOCAL_IPV4 "172.20.20.170" |
| #define REMOTE_IPV4 "172.20.20.187" |
| |
| #define LOCAL_IPV6 "fe80::aa" |
| #define REMOTE_IPV6 "fe80::bb" |
| |
| #define IFF_NAPI 0x0010 |
| #define IFF_NAPI_FRAGS 0x0020 |
| |
| static void initialize_tun(void) |
| { |
| 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; |
| } |
| const int kTunFd = 240; |
| if (dup2(tunfd, kTunFd) < 0) |
| exit(1); |
| close(tunfd); |
| tunfd = kTunFd; |
| struct ifreq ifr; |
| memset(&ifr, 0, sizeof(ifr)); |
| strncpy(ifr.ifr_name, TUN_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) |
| exit(1); |
| } |
| if (ioctl(tunfd, TUNGETIFF, (void*)&ifr) < 0) |
| exit(1); |
| tun_frags_enabled = (ifr.ifr_flags & IFF_NAPI_FRAGS) != 0; |
| execute_command(0, "sysctl -w net.ipv6.conf.%s.accept_dad=0", TUN_IFACE); |
| execute_command(0, "sysctl -w net.ipv6.conf.%s.router_solicitations=0", |
| TUN_IFACE); |
| execute_command(1, "ip link set dev %s address %s", TUN_IFACE, LOCAL_MAC); |
| execute_command(1, "ip addr add %s/24 dev %s", LOCAL_IPV4, TUN_IFACE); |
| execute_command(1, "ip neigh add %s lladdr %s dev %s nud permanent", |
| REMOTE_IPV4, REMOTE_MAC, TUN_IFACE); |
| execute_command(0, "ip -6 addr add %s/120 dev %s", LOCAL_IPV6, TUN_IFACE); |
| execute_command(0, "ip -6 neigh add %s lladdr %s dev %s nud permanent", |
| REMOTE_IPV6, REMOTE_MAC, TUN_IFACE); |
| execute_command(1, "ip link set dev %s up", TUN_IFACE); |
| } |
| |
| #define DEV_IPV4 "172.20.20.%d" |
| #define DEV_IPV6 "fe80::%02hx" |
| #define DEV_MAC "aa:aa:aa:aa:aa:%02hx" |
| |
| 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); |
| } |
| static void initialize_netdevices(void) |
| { |
| unsigned i; |
| const char* devtypes[] = {"ip6gretap", "bridge", "vcan", "bond", "team"}; |
| const char* devnames[] = {"lo", |
| "sit0", |
| "bridge0", |
| "vcan0", |
| "tunl0", |
| "gre0", |
| "gretap0", |
| "ip_vti0", |
| "ip6_vti0", |
| "ip6tnl0", |
| "ip6gre0", |
| "ip6gretap0", |
| "erspan0", |
| "bond0", |
| "veth0", |
| "veth1", |
| "team0", |
| "veth0_to_bridge", |
| "veth1_to_bridge", |
| "veth0_to_bond", |
| "veth1_to_bond", |
| "veth0_to_team", |
| "veth1_to_team"}; |
| const char* devmasters[] = {"bridge", "bond", "team"}; |
| for (i = 0; i < sizeof(devtypes) / (sizeof(devtypes[0])); i++) |
| execute_command(0, "ip link add dev %s0 type %s", devtypes[i], devtypes[i]); |
| execute_command(0, "ip link add type veth"); |
| for (i = 0; i < sizeof(devmasters) / (sizeof(devmasters[0])); i++) { |
| execute_command( |
| 0, "ip link add name %s_slave_0 type veth peer name veth0_to_%s", |
| devmasters[i], devmasters[i]); |
| execute_command( |
| 0, "ip link add name %s_slave_1 type veth peer name veth1_to_%s", |
| devmasters[i], devmasters[i]); |
| execute_command(0, "ip link set %s_slave_0 master %s0", devmasters[i], |
| devmasters[i]); |
| execute_command(0, "ip link set %s_slave_1 master %s0", devmasters[i], |
| devmasters[i]); |
| execute_command(0, "ip link set veth0_to_%s up", devmasters[i]); |
| execute_command(0, "ip link set veth1_to_%s up", devmasters[i]); |
| } |
| execute_command(0, "ip link set bridge_slave_0 up"); |
| execute_command(0, "ip link set bridge_slave_1 up"); |
| for (i = 0; i < sizeof(devnames) / (sizeof(devnames[0])); i++) { |
| char addr[32]; |
| snprintf_check(addr, sizeof(addr), DEV_IPV4, i + 10); |
| execute_command(0, "ip -4 addr add %s/24 dev %s", addr, devnames[i]); |
| snprintf_check(addr, sizeof(addr), DEV_IPV6, i + 10); |
| execute_command(0, "ip -6 addr add %s/120 dev %s", addr, devnames[i]); |
| snprintf_check(addr, sizeof(addr), DEV_MAC, i + 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 long syz_genetlink_get_family_id(long name) |
| { |
| char buf[512] = {0}; |
| struct nlmsghdr* hdr = (struct nlmsghdr*)buf; |
| struct genlmsghdr* genlhdr = (struct genlmsghdr*)NLMSG_DATA(hdr); |
| struct nlattr* attr = (struct nlattr*)(genlhdr + 1); |
| hdr->nlmsg_len = |
| sizeof(*hdr) + sizeof(*genlhdr) + sizeof(*attr) + GENL_NAMSIZ; |
| hdr->nlmsg_type = GENL_ID_CTRL; |
| hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; |
| genlhdr->cmd = CTRL_CMD_GETFAMILY; |
| attr->nla_type = CTRL_ATTR_FAMILY_NAME; |
| attr->nla_len = sizeof(*attr) + GENL_NAMSIZ; |
| strncpy((char*)(attr + 1), (char*)name, GENL_NAMSIZ); |
| struct iovec iov = {hdr, hdr->nlmsg_len}; |
| struct sockaddr_nl addr = {0}; |
| addr.nl_family = AF_NETLINK; |
| int fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC); |
| if (fd == -1) { |
| return -1; |
| } |
| struct msghdr msg = {&addr, sizeof(addr), &iov, 1, NULL, 0, 0}; |
| if (sendmsg(fd, &msg, 0) == -1) { |
| close(fd); |
| return -1; |
| } |
| ssize_t n = recv(fd, buf, sizeof(buf), 0); |
| close(fd); |
| if (n <= 0) { |
| return -1; |
| } |
| if (hdr->nlmsg_type != GENL_ID_CTRL) { |
| return -1; |
| } |
| for (; (char*)attr < buf + n; |
| attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) { |
| if (attr->nla_type == CTRL_ATTR_FAMILY_ID) |
| return *(uint16_t*)(attr + 1); |
| } |
| return -1; |
| } |
| |
| 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)) { |
| } |
| } |
| |
| 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)) { |
| } |
| initialize_tun(); |
| initialize_netdevices(); |
| loop(); |
| exit(1); |
| } |
| |
| static int inject_fault(int nth) |
| { |
| int fd; |
| char buf[16]; |
| fd = open("/proc/thread-self/fail-nth", O_RDWR); |
| if (fd == -1) |
| exit(1); |
| sprintf(buf, "%d", nth + 1); |
| if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf)) |
| exit(1); |
| return fd; |
| } |
| |
| uint64_t r[2] = {0xffffffffffffffff, 0x0}; |
| |
| void loop(void) |
| { |
| long res = 0; |
| res = syscall(__NR_socket, 0x10, 3, 0x10); |
| if (res != -1) |
| r[0] = res; |
| memcpy((void*)0x20000100, "TIPCv2\x00", 7); |
| res = syz_genetlink_get_family_id(0x20000100); |
| if (res != -1) |
| r[1] = res; |
| *(uint64_t*)0x200000c0 = 0; |
| *(uint32_t*)0x200000c8 = 0; |
| *(uint64_t*)0x200000d0 = 0x20000080; |
| *(uint64_t*)0x20000080 = 0x200002c0; |
| *(uint32_t*)0x200002c0 = 0x30; |
| *(uint16_t*)0x200002c4 = r[1]; |
| *(uint16_t*)0x200002c6 = 1; |
| *(uint32_t*)0x200002c8 = 0; |
| *(uint32_t*)0x200002cc = 0; |
| *(uint8_t*)0x200002d0 = 3; |
| *(uint8_t*)0x200002d1 = 0; |
| *(uint16_t*)0x200002d2 = 0; |
| *(uint16_t*)0x200002d4 = 0x1c; |
| *(uint16_t*)0x200002d6 = 1; |
| *(uint16_t*)0x200002d8 = 0x18; |
| *(uint16_t*)0x200002da = 1; |
| memcpy((void*)0x200002dc, "eth", 3); |
| *(uint8_t*)0x200002df = 0x3a; |
| memcpy((void*)0x200002e0, "bridge_slave_1\x00", 15); |
| *(uint64_t*)0x20000088 = 0x30; |
| *(uint64_t*)0x200000d8 = 1; |
| *(uint64_t*)0x200000e0 = 0; |
| *(uint64_t*)0x200000e8 = 0; |
| *(uint32_t*)0x200000f0 = 0; |
| write_file("/sys/kernel/debug/failslab/ignore-gfp-wait", "N"); |
| write_file("/sys/kernel/debug/fail_futex/ignore-private", "N"); |
| inject_fault(3); |
| syscall(__NR_sendmsg, r[0], 0x200000c0, 0); |
| } |
| int main(void) |
| { |
| syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); |
| do_sandbox_none(); |
| return 0; |
| } |