// https://syzkaller.appspot.com/bug?id=03b5adb3121c1eeefea3fa9c04064c5696f6ecc9 // 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 #ifndef __NR_ioctl #define __NR_ioctl 29 #endif #ifndef __NR_mmap #define __NR_mmap 222 #endif #ifndef __NR_sendmsg #define __NR_sendmsg 211 #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)))) 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; } #define WIFI_INITIAL_DEVICE_COUNT 2 #define WIFI_MAC_BASE \ { \ 0x08, 0x02, 0x11, 0x00, 0x00, 0x00 \ } #define WIFI_IBSS_BSSID \ { \ 0x50, 0x50, 0x50, 0x50, 0x50, 0x50 \ } #define WIFI_IBSS_SSID \ { \ 0x10, 0x10, 0x10, 0x10, 0x10, 0x10 \ } #define WIFI_DEFAULT_FREQUENCY 2412 #define WIFI_DEFAULT_SIGNAL 0 #define WIFI_DEFAULT_RX_RATE 1 #define HWSIM_CMD_REGISTER 1 #define HWSIM_CMD_FRAME 2 #define HWSIM_CMD_NEW_RADIO 4 #define HWSIM_ATTR_SUPPORT_P2P_DEVICE 14 #define HWSIM_ATTR_PERM_ADDR 22 #define IF_OPER_UP 6 struct join_ibss_props { int wiphy_freq; bool wiphy_freq_fixed; uint8_t* mac; uint8_t* ssid; int ssid_len; }; static int set_interface_state(const char* interface_name, int on) { struct ifreq ifr; int sock = socket(AF_INET, SOCK_DGRAM, 0); if (sock < 0) { return -1; } memset(&ifr, 0, sizeof(ifr)); strcpy(ifr.ifr_name, interface_name); int ret = ioctl(sock, SIOCGIFFLAGS, &ifr); if (ret < 0) { close(sock); return -1; } if (on) ifr.ifr_flags |= IFF_UP; else ifr.ifr_flags &= ~IFF_UP; ret = ioctl(sock, SIOCSIFFLAGS, &ifr); close(sock); if (ret < 0) { return -1; } return 0; } static int nl80211_set_interface(struct nlmsg* nlmsg, int sock, int nl80211_family, uint32_t ifindex, uint32_t iftype) { struct genlmsghdr genlhdr; memset(&genlhdr, 0, sizeof(genlhdr)); genlhdr.cmd = NL80211_CMD_SET_INTERFACE; netlink_init(nlmsg, nl80211_family, 0, &genlhdr, sizeof(genlhdr)); netlink_attr(nlmsg, NL80211_ATTR_IFINDEX, &ifindex, sizeof(ifindex)); netlink_attr(nlmsg, NL80211_ATTR_IFTYPE, &iftype, sizeof(iftype)); int err = netlink_send(nlmsg, sock); if (err < 0) { } return err; } static int nl80211_join_ibss(struct nlmsg* nlmsg, int sock, int nl80211_family, uint32_t ifindex, struct join_ibss_props* props) { struct genlmsghdr genlhdr; memset(&genlhdr, 0, sizeof(genlhdr)); genlhdr.cmd = NL80211_CMD_JOIN_IBSS; netlink_init(nlmsg, nl80211_family, 0, &genlhdr, sizeof(genlhdr)); netlink_attr(nlmsg, NL80211_ATTR_IFINDEX, &ifindex, sizeof(ifindex)); netlink_attr(nlmsg, NL80211_ATTR_SSID, props->ssid, props->ssid_len); netlink_attr(nlmsg, NL80211_ATTR_WIPHY_FREQ, &(props->wiphy_freq), sizeof(props->wiphy_freq)); if (props->mac) netlink_attr(nlmsg, NL80211_ATTR_MAC, props->mac, ETH_ALEN); if (props->wiphy_freq_fixed) netlink_attr(nlmsg, NL80211_ATTR_FREQ_FIXED, NULL, 0); int err = netlink_send(nlmsg, sock); if (err < 0) { } return err; } static int get_ifla_operstate(struct nlmsg* nlmsg, int ifindex) { struct ifinfomsg info; memset(&info, 0, sizeof(info)); info.ifi_family = AF_UNSPEC; info.ifi_index = ifindex; int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); if (sock == -1) { return -1; } netlink_init(nlmsg, RTM_GETLINK, 0, &info, sizeof(info)); int n; int err = netlink_send_ext(nlmsg, sock, RTM_NEWLINK, &n, true); close(sock); if (err) { return -1; } struct rtattr* attr = IFLA_RTA(NLMSG_DATA(nlmsg->buf)); for (; RTA_OK(attr, n); attr = RTA_NEXT(attr, n)) { if (attr->rta_type == IFLA_OPERSTATE) return *((int32_t*)RTA_DATA(attr)); } return -1; } static int await_ifla_operstate(struct nlmsg* nlmsg, char* interface, int operstate) { int ifindex = if_nametoindex(interface); while (true) { usleep(1000); int ret = get_ifla_operstate(nlmsg, ifindex); if (ret < 0) return ret; if (ret == operstate) return 0; } return 0; } static int nl80211_setup_ibss_interface(struct nlmsg* nlmsg, int sock, int nl80211_family_id, char* interface, struct join_ibss_props* ibss_props) { int ifindex = if_nametoindex(interface); if (ifindex == 0) { return -1; } int ret = nl80211_set_interface(nlmsg, sock, nl80211_family_id, ifindex, NL80211_IFTYPE_ADHOC); if (ret < 0) { return -1; } ret = set_interface_state(interface, 1); if (ret < 0) { return -1; } ret = nl80211_join_ibss(nlmsg, sock, nl80211_family_id, ifindex, ibss_props); if (ret < 0) { return -1; } return 0; } static long syz_genetlink_get_family_id(volatile long name, volatile long sock_arg) { int fd = sock_arg; if (fd < 0) { fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC); if (fd == -1) { return -1; } } struct nlmsg nlmsg_tmp; int ret = netlink_query_family_id(&nlmsg_tmp, fd, (char*)name, false); if ((int)sock_arg < 0) close(fd); if (ret < 0) { return -1; } return ret; } #define WIFI_MAX_SSID_LEN 32 #define WIFI_JOIN_IBSS_NO_SCAN 0 #define WIFI_JOIN_IBSS_BG_SCAN 1 #define WIFI_JOIN_IBSS_BG_NO_SCAN 2 static long syz_80211_join_ibss(volatile long a0, volatile long a1, volatile long a2, volatile long a3) { char* interface = (char*)a0; uint8_t* ssid = (uint8_t*)a1; int ssid_len = (int)a2; int mode = (int)a3; struct nlmsg tmp_msg; uint8_t bssid[ETH_ALEN] = WIFI_IBSS_BSSID; if (ssid_len < 0 || ssid_len > WIFI_MAX_SSID_LEN) { return -1; } if (mode < 0 || mode > WIFI_JOIN_IBSS_BG_NO_SCAN) { return -1; } int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC); if (sock < 0) { return -1; } int nl80211_family_id = netlink_query_family_id(&tmp_msg, sock, "nl80211", true); struct join_ibss_props ibss_props = { .wiphy_freq = WIFI_DEFAULT_FREQUENCY, .wiphy_freq_fixed = (mode == WIFI_JOIN_IBSS_NO_SCAN || mode == WIFI_JOIN_IBSS_BG_NO_SCAN), .mac = bssid, .ssid = ssid, .ssid_len = ssid_len}; int ret = nl80211_setup_ibss_interface(&tmp_msg, sock, nl80211_family_id, interface, &ibss_props); close(sock); if (ret < 0) { return -1; } if (mode == WIFI_JOIN_IBSS_NO_SCAN) { ret = await_ifla_operstate(&tmp_msg, interface, IF_OPER_UP); if (ret < 0) { return -1; } } return 0; } uint64_t r[5] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; 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); intptr_t res = 0; res = syscall(__NR_socket, 0x10ul, 3ul, 0); if (res != -1) r[0] = res; *(uint64_t*)0x20006440 = 0; *(uint32_t*)0x20006448 = 0; *(uint64_t*)0x20006450 = 0x200063c0; *(uint64_t*)0x200063c0 = 0x20000600; *(uint32_t*)0x20000600 = 0x38; *(uint16_t*)0x20000604 = 0x10; *(uint16_t*)0x20000606 = 1; *(uint32_t*)0x20000608 = 0; *(uint32_t*)0x2000060c = 0; *(uint16_t*)0x20000610 = 8; STORE_BY_BITMASK(uint16_t, , 0x20000612, 0, 0, 14); STORE_BY_BITMASK(uint16_t, , 0x20000613, 0, 6, 1); STORE_BY_BITMASK(uint16_t, , 0x20000613, 0, 7, 1); *(uint32_t*)0x20000614 = 0; *(uint16_t*)0x20000618 = 8; STORE_BY_BITMASK(uint16_t, , 0x2000061a, 0, 0, 14); STORE_BY_BITMASK(uint16_t, , 0x2000061b, 0, 6, 1); STORE_BY_BITMASK(uint16_t, , 0x2000061b, 0, 7, 1); *(uint32_t*)0x2000061c = 0; *(uint16_t*)0x20000620 = 0x14; STORE_BY_BITMASK(uint16_t, , 0x20000622, 0x1b, 0, 14); STORE_BY_BITMASK(uint16_t, , 0x20000623, 0, 6, 1); STORE_BY_BITMASK(uint16_t, , 0x20000623, 0, 7, 1); *(uint64_t*)0x20000624 = htobe64(0x21); *(uint64_t*)0x2000062c = htobe64(1); *(uint16_t*)0x20000634 = 4; STORE_BY_BITMASK(uint16_t, , 0x20000636, 0, 0, 14); STORE_BY_BITMASK(uint16_t, , 0x20000637, 0, 6, 1); STORE_BY_BITMASK(uint16_t, , 0x20000637, 0, 7, 1); *(uint64_t*)0x200063c8 = 0x38; *(uint64_t*)0x20006458 = 1; *(uint64_t*)0x20006460 = 0; *(uint64_t*)0x20006468 = 0; *(uint32_t*)0x20006470 = 0; syscall(__NR_sendmsg, r[0], 0x20006440ul, 0ul); res = syscall(__NR_socket, 0xaul, 3ul, 0x3a); if (res != -1) r[1] = res; res = syscall(__NR_socket, 0x10ul, 3ul, 0x10); if (res != -1) r[2] = res; memcpy((void*)0x20000080, "nl80211\000", 8); res = -1; res = syz_genetlink_get_family_id(0x20000080, -1); if (res != -1) r[3] = res; memcpy((void*)0x20000340, "wlan1\000\000\000\000\000\000\000\000\000\000\000", 16); res = syscall(__NR_ioctl, r[1], 0x8933, 0x20000340ul); if (res != -1) r[4] = *(uint32_t*)0x20000350; *(uint64_t*)0x20000100 = 0; *(uint32_t*)0x20000108 = 0; *(uint64_t*)0x20000110 = 0x20000140; *(uint64_t*)0x20000140 = 0x200002c0; memcpy((void*)0x200002c0, "$\000\000\000", 4); *(uint16_t*)0x200002c4 = r[3]; memcpy((void*)0x200002c6, "\x05\x00\x00\x00\x00\x00\x00\x00\x00\x00\x06\x00\x1b\x00\x08\x00\x03" "\x00", 18); *(uint32_t*)0x200002d8 = r[4]; memcpy((void*)0x200002dc, "\x08\x00\x05\x00\x0b", 5); *(uint64_t*)0x20000148 = 0x24; *(uint64_t*)0x20000118 = 1; *(uint64_t*)0x20000120 = 0; *(uint64_t*)0x20000128 = 0; *(uint32_t*)0x20000130 = 0; syscall(__NR_sendmsg, r[2], 0x20000100ul, 0ul); memcpy((void*)0x20000140, "wlan1\000", 6); syz_80211_join_ibss(0x20000140, 0, 0, 0); return 0; }