// https://syzkaller.appspot.com/bug?id=128e6b287f4c145398b3783944b88236d33e9774 // 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifndef __NR_bpf #define __NR_bpf 280 #endif #ifndef __NR_ioctl #define __NR_ioctl 29 #endif #ifndef __NR_mmap #define __NR_mmap 222 #endif #ifndef __NR_socket #define __NR_socket 198 #endif #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)))) 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; } struct nlmsg { char* pos; int nesting; struct nlattr* nested[8]; char buf[4096]; }; static void netlink_init(struct nlmsg* nlmsg, int typ, int flags, const void* data, int size) { memset(nlmsg, 0, sizeof(*nlmsg)); struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf; hdr->nlmsg_type = typ; hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | flags; memcpy(hdr + 1, data, size); nlmsg->pos = (char*)(hdr + 1) + NLMSG_ALIGN(size); } static void netlink_attr(struct nlmsg* nlmsg, int typ, const void* data, int size) { struct nlattr* attr = (struct nlattr*)nlmsg->pos; attr->nla_len = sizeof(*attr) + size; attr->nla_type = typ; if (size > 0) memcpy(attr + 1, data, size); nlmsg->pos += NLMSG_ALIGN(attr->nla_len); } static int netlink_send_ext(struct nlmsg* nlmsg, int sock, uint16_t reply_type, int* reply_len, bool dofail) { if (nlmsg->pos > nlmsg->buf + sizeof(nlmsg->buf) || nlmsg->nesting) exit(1); struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf; hdr->nlmsg_len = nlmsg->pos - nlmsg->buf; struct sockaddr_nl addr; memset(&addr, 0, sizeof(addr)); addr.nl_family = AF_NETLINK; ssize_t n = sendto(sock, nlmsg->buf, hdr->nlmsg_len, 0, (struct sockaddr*)&addr, sizeof(addr)); if (n != (ssize_t)hdr->nlmsg_len) { if (dofail) exit(1); return -1; } n = recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0); if (reply_len) *reply_len = 0; if (n < 0) { if (dofail) exit(1); return -1; } if (n < (ssize_t)sizeof(struct nlmsghdr)) { errno = EINVAL; if (dofail) exit(1); return -1; } if (hdr->nlmsg_type == NLMSG_DONE) return 0; if (reply_len && hdr->nlmsg_type == reply_type) { *reply_len = n; return 0; } if (n < (ssize_t)(sizeof(struct nlmsghdr) + sizeof(struct nlmsgerr))) { errno = EINVAL; if (dofail) exit(1); return -1; } if (hdr->nlmsg_type != NLMSG_ERROR) { errno = EINVAL; if (dofail) exit(1); return -1; } errno = -((struct nlmsgerr*)(hdr + 1))->error; return -errno; } static int netlink_send(struct nlmsg* nlmsg, int sock) { return netlink_send_ext(nlmsg, sock, 0, NULL, true); } static int netlink_query_family_id(struct nlmsg* nlmsg, int sock, const char* family_name, bool dofail) { struct genlmsghdr genlhdr; memset(&genlhdr, 0, sizeof(genlhdr)); genlhdr.cmd = CTRL_CMD_GETFAMILY; netlink_init(nlmsg, GENL_ID_CTRL, 0, &genlhdr, sizeof(genlhdr)); netlink_attr(nlmsg, CTRL_ATTR_FAMILY_NAME, family_name, strnlen(family_name, GENL_NAMSIZ - 1) + 1); int n = 0; int err = netlink_send_ext(nlmsg, sock, GENL_ID_CTRL, &n, dofail); if (err < 0) { return -1; } uint16_t id = 0; struct nlattr* attr = (struct nlattr*)(nlmsg->buf + NLMSG_HDRLEN + NLMSG_ALIGN(sizeof(genlhdr))); for (; (char*)attr < nlmsg->buf + n; attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) { if (attr->nla_type == CTRL_ATTR_FAMILY_ID) { id = *(uint16_t*)(attr + 1); break; } } if (!id) { errno = EINVAL; return -1; } recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0); return id; } static void netlink_device_change(struct nlmsg* nlmsg, int sock, const char* name, bool up, const char* master, const void* mac, int macsize, const char* new_name) { struct ifinfomsg hdr; memset(&hdr, 0, sizeof(hdr)); if (up) hdr.ifi_flags = hdr.ifi_change = IFF_UP; hdr.ifi_index = if_nametoindex(name); netlink_init(nlmsg, RTM_NEWLINK, 0, &hdr, sizeof(hdr)); if (new_name) netlink_attr(nlmsg, IFLA_IFNAME, new_name, strlen(new_name)); if (master) { int ifindex = if_nametoindex(master); netlink_attr(nlmsg, IFLA_MASTER, &ifindex, sizeof(ifindex)); } if (macsize) netlink_attr(nlmsg, IFLA_ADDRESS, mac, macsize); int err = netlink_send(nlmsg, sock); if (err < 0) { } } static int netlink_add_addr(struct nlmsg* nlmsg, int sock, const char* dev, const void* addr, int addrsize) { struct ifaddrmsg hdr; memset(&hdr, 0, sizeof(hdr)); hdr.ifa_family = addrsize == 4 ? AF_INET : AF_INET6; hdr.ifa_prefixlen = addrsize == 4 ? 24 : 120; hdr.ifa_scope = RT_SCOPE_UNIVERSE; hdr.ifa_index = if_nametoindex(dev); netlink_init(nlmsg, RTM_NEWADDR, NLM_F_CREATE | NLM_F_REPLACE, &hdr, sizeof(hdr)); netlink_attr(nlmsg, IFA_LOCAL, addr, addrsize); netlink_attr(nlmsg, IFA_ADDRESS, addr, addrsize); return netlink_send(nlmsg, sock); } static void netlink_add_addr4(struct nlmsg* nlmsg, int sock, const char* dev, const char* addr) { struct in_addr in_addr; inet_pton(AF_INET, addr, &in_addr); int err = netlink_add_addr(nlmsg, sock, dev, &in_addr, sizeof(in_addr)); if (err < 0) { } } static void netlink_add_addr6(struct nlmsg* nlmsg, int sock, const char* dev, const char* addr) { struct in6_addr in6_addr; inet_pton(AF_INET6, addr, &in6_addr); int err = netlink_add_addr(nlmsg, sock, dev, &in6_addr, sizeof(in6_addr)); if (err < 0) { } } static void netlink_add_neigh(struct nlmsg* nlmsg, int sock, const char* name, const void* addr, int addrsize, const void* mac, int macsize) { struct ndmsg hdr; memset(&hdr, 0, sizeof(hdr)); hdr.ndm_family = addrsize == 4 ? AF_INET : AF_INET6; hdr.ndm_ifindex = if_nametoindex(name); hdr.ndm_state = NUD_PERMANENT; netlink_init(nlmsg, RTM_NEWNEIGH, NLM_F_EXCL | NLM_F_CREATE, &hdr, sizeof(hdr)); netlink_attr(nlmsg, NDA_DST, addr, addrsize); netlink_attr(nlmsg, NDA_LLADDR, mac, macsize); int err = netlink_send(nlmsg, sock); if (err < 0) { } } static struct nlmsg nlmsg; static int tunfd = -1; #define TUN_IFACE "syz_tun" #define LOCAL_MAC 0xaaaaaaaaaaaa #define REMOTE_MAC 0xaaaaaaaaaabb #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 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 = 200; 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; if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0) { exit(1); } char sysctl[64]; sprintf(sysctl, "/proc/sys/net/ipv6/conf/%s/accept_dad", TUN_IFACE); write_file(sysctl, "0"); sprintf(sysctl, "/proc/sys/net/ipv6/conf/%s/router_solicitations", TUN_IFACE); write_file(sysctl, "0"); int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); if (sock == -1) exit(1); netlink_add_addr4(&nlmsg, sock, TUN_IFACE, LOCAL_IPV4); netlink_add_addr6(&nlmsg, sock, TUN_IFACE, LOCAL_IPV6); uint64_t macaddr = REMOTE_MAC; struct in_addr in_addr; inet_pton(AF_INET, REMOTE_IPV4, &in_addr); netlink_add_neigh(&nlmsg, sock, TUN_IFACE, &in_addr, sizeof(in_addr), &macaddr, ETH_ALEN); struct in6_addr in6_addr; inet_pton(AF_INET6, REMOTE_IPV6, &in6_addr); netlink_add_neigh(&nlmsg, sock, TUN_IFACE, &in6_addr, sizeof(in6_addr), &macaddr, ETH_ALEN); macaddr = LOCAL_MAC; netlink_device_change(&nlmsg, sock, TUN_IFACE, true, 0, &macaddr, ETH_ALEN, NULL); close(sock); } static long syz_emit_ethernet(volatile long a0, volatile long a1, volatile long a2) { if (tunfd < 0) return (uintptr_t)-1; uint32_t length = a0; char* data = (char*)a1; return write(tunfd, data, length); } static void setup_common() { if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) { } } static void setup_binderfs() { if (mkdir("/dev/binderfs", 0777)) { } if (mount("binder", "/dev/binderfs", "binder", 0, NULL)) { } if (symlink("/dev/binderfs", "./binderfs")) { } } static void loop(); static void sandbox_common() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); 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 = 128 << 20; setrlimit(RLIMIT_CORE, &rlim); rlim.rlim_cur = rlim.rlim_max = 256; setrlimit(RLIMIT_NOFILE, &rlim); if (unshare(CLONE_NEWNS)) { } if (mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL)) { } 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); } static int wait_for_loop(int pid) { if (pid < 0) exit(1); int status = 0; while (waitpid(-1, &status, __WALL) != pid) { } return WEXITSTATUS(status); } static void drop_caps(void) { 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)) exit(1); const int drop = (1 << CAP_SYS_PTRACE) | (1 << CAP_SYS_NICE); cap_data[0].effective &= ~drop; cap_data[0].permitted &= ~drop; cap_data[0].inheritable &= ~drop; if (syscall(SYS_capset, &cap_hdr, &cap_data)) exit(1); } 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(); drop_caps(); if (unshare(CLONE_NEWNET)) { } write_file("/proc/sys/net/ipv4/ping_group_range", "0 65535"); initialize_tun(); setup_binderfs(); loop(); exit(1); } uint64_t r[3] = {0xffffffffffffffff, 0x0, 0xffffffffffffffff}; void loop(void) { intptr_t res = 0; res = syscall(__NR_socket, /*domain=*/0x11ul, /*type=*/3ul, /*proto=*/0x300); if (res != -1) r[0] = res; memcpy((void*)0x20000080, "syz_tun\000\000\000\000\000\000\000\000\000", 16); res = syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x8933, /*arg=*/0x20000080ul); if (res != -1) r[1] = *(uint32_t*)0x20000090; *(uint32_t*)0x20000180 = 6; *(uint32_t*)0x20000184 = 4; *(uint64_t*)0x20000188 = 0x20000580; memcpy( (void*)0x20000580, "\x18\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x85\x00" "\x00\x00\x41\x00\x00\x00\x95\x00\x00\x00\x00\x00\x00\x00\x4b\xe9\x89\x11" "\xed\x52\x3c\xf4\x45\x1d\x51\xe4\x00\xcb\xd3\x0e\xfb\xb0\xa7\x3c\xeb\x2b" "\x8f\x0a\x45\x6c\x3a\x6c\xfd\x12\x78\x68\xad\x3f\xe3\xf9\xa9\xb9\x46\xc9" "\x7f\x9f\xc0\x91\xe4\xc3\xf4\xb0\xa0\xd7\xed\x29\x87\x17\xa4\x80\xc4\x88" "\x68\x56\x2f\x04\x00\x59\x72\xb6\xa5\x26\x55\x19\xfe\xe4\xcb\x1b\x8b\x93" "\xf0\xb1\x64\x77\x0f\xd4\x0c\x7a\x80\x60\xce\x72\xbe\xff\x7c\xda\x17\x7e" "\x28\xa1\xa9\x7b\x2c\x8c\x56\xa3\xf1\x5b\x2f\x7a\x9b\x7a\xe2\x95\x09\x52" "\x17\xbf\xf8\xc9\x44\x1a\x45\xfd\x00\x00\x00\x00\x00\x00\x00", 159); *(uint64_t*)0x20000190 = 0x200000c0; memcpy((void*)0x200000c0, "GPL\000", 4); *(uint32_t*)0x20000198 = 4; *(uint32_t*)0x2000019c = 0x1000; *(uint64_t*)0x200001a0 = 0x2062b000; *(uint32_t*)0x200001a8 = 0; *(uint32_t*)0x200001ac = 0; memset((void*)0x200001b0, 0, 16); *(uint32_t*)0x200001c0 = 0; *(uint32_t*)0x200001c4 = 0; *(uint32_t*)0x200001c8 = -1; *(uint32_t*)0x200001cc = 8; *(uint64_t*)0x200001d0 = 0; *(uint32_t*)0x200001d8 = 0; *(uint32_t*)0x200001dc = 0x10; *(uint64_t*)0x200001e0 = 0; *(uint32_t*)0x200001e8 = 0; *(uint32_t*)0x200001ec = 0; *(uint32_t*)0x200001f0 = -1; *(uint32_t*)0x200001f4 = 0; *(uint64_t*)0x200001f8 = 0; res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x20000180ul, /*size=*/0x70ul); if (res != -1) r[2] = res; *(uint32_t*)0x200000c0 = r[2]; *(uint32_t*)0x200000c4 = r[1]; *(uint32_t*)0x200000c8 = 0x25; *(uint32_t*)0x200000cc = 0; syscall(__NR_bpf, /*cmd=*/0x1cul, /*arg=*/0x200000c0ul, /*size=*/0x10ul); memset((void*)0x20001000, 170, 5); *(uint8_t*)0x20001005 = 0xbb; memset((void*)0x20001006, 170, 5); *(uint8_t*)0x2000100b = 0xaa; *(uint16_t*)0x2000100c = htobe16(0x8100); STORE_BY_BITMASK(uint16_t, , 0x2000100e, 0, 0, 3); STORE_BY_BITMASK(uint16_t, , 0x2000100e, 0, 3, 1); STORE_BY_BITMASK(uint16_t, , 0x2000100e, 0, 4, 12); *(uint16_t*)0x20001010 = htobe16(0); memcpy( (void*)0x20001012, "\x91\x01\x8f\xd4\xc6\x41\xaa\xc2\x49\xe3\x50\x07\x71\x24\x07\xe7\x72\x18" "\xb3\x64\x9f\x1e\xdd\x9a\xe6\xc7\x22\xa0\x6e\xa0\x22\x0c\x95\x1b\xad\xa9" "\x77\xa7\x89\x1d\x54\x29\x6f\xe7\x34\x3f\xdd\x15\xf9\x50\xb7\x9c\x26\x41" "\x48\x0c\x1b\x3a\xd7\xda\xf2\x86\xc0\x8c\x5d\xfa\x16\xd0\x0c\x5a\xe2\xc8" "\x48\x53\xa5\xa2\xdf\xab\xe4\x44\x4d\xda\xb4\x25\xcc\x15\x39\xc5\xa2\xf3" "\x40\xfd\x18\xeb\x81\x2e\xb1\x4a\xab\xd9\x9a\xf0\xf3\x15\x91\x26\xa9\xeb" "\x95\xdc\x16\x2b\x19\xe4\x67\x48\xfe\xf4\x3d\x1d\x73\x4d\x2e\x1c\xa9\xba" "\xa0\xc7\x0e\x97\x28\xe3\x1a\x0a\xfe\xff\x15\x07\x2a\xcd\x7e\x7f\xf5\x97" "\x0e\xbe\x50\xf3\x96\x79\x47\x2a\x5a\x51\x77\x82\xe9\xac\xe4\xe7\x70\x09" 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"\x66\x3c\xea\xd5\xe4\xba\x18\xf5\x5a\xf7\x55\x5f\xac\x31\x51\x80\xde\x83" "\x8f\x72\x6e\x40\xa3\xb7\x80\xa5\x3b\x83\x7d\x96\xdb\x10\x66\xf7\x54\x77" "\x7a\x85\xef\xd7\x2f\xdf\xe2\x00\x8d\x7c\x34\x6e\x95\x09\xed\xf6\x01\x16" "\x4b\x37\x2c\xb5\x08\xba\x15\xfe\x81\xdb\x11\x56\x79\x04\xa2\xf8\x5e\x22" "\x18\xab\xca\x00\xce\x73\x53\x0f\x6e\xcd\x85\xf6\x32\xea\x27\xdd\xfd\x26" "\x64\xdc\xef\x02\x3f\xb1\x8a\x21\x89\xf4\xab\x09\x11\x5c\xb9\x70\x0c\x73" "\xde\xec\x41\xc7\x1f\x21\xdd\xa1\x94\xf5\xab\xca\xce\xc2\xc5\x87\xcf\x47" "\x4c\x39\xc9\xf2\xae\xaf\xb7\x5d\x12\xaa\x78\x91\x1a\x99\x32\xf4\xe8\x04" "\xf7\xb8\x88\x8f\x9e\x82\x0d\x94\x6e\xa5\x16\x46\x88\xb0\x42\x04\x06\x19" "\xb4\x1d\xc4\xe1\x73\xa0\xab\xf2\xf8\x45\xe4\x2f\xa7\x0d\x9b\xf2\x8c\x7f" "\x8b\xb6\xcd\x0e\xb9\x2a\x10\xa6\x87\xec\x45\xb9\xb0\x95\xc3\xb6\xd1\xbe" "\x79\x8e\x85\x29\xea\x29\x64\x1f\xa3\xe2\xc7\x1b\x49\x82\xff\xaf\xdf\x92" "\x54\xe1\xf9\xd3\xcc\xa9\x6f\x08\x8a\x05\x79\x48\x0d\xc1\xde\x11\x58\xb0" "\x6a\x9f\xe5\x2a\x79\x16\xd7\x90\x0c\x15\x09\x6e\x35\x31\xe5\x33\x98\x68" "\xb0\x02\xf4\x84\x73", 3695); syz_emit_ethernet(/*len=*/0xe81, /*packet=*/0x20001000, /*frags=*/0); } 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); do_sandbox_none(); return 0; }