KASAN: slab-use-after-free Read in ip_finish_output
From: xingwei lee <hidden>
Date: 2024-03-06 10:00:53
Also in:
linux-hams, lkml
Hello, I found a new bug titled "KASAN: slab-use-after-free Read in ip_finish_output” or “KASAN: slab-use-after-free in sk_to_full_sk" and confirmed it in the latest net and net-next branch. After my simple analysis, it may be related to the net/rose or AF_PACKET/PF_PACKET socket. If you fix this issue, please add the following tag to the commit: Reported-by: xingwei lee <redacted> Reported-by: yue sun <redacted> kernel: net-next e3350ba4a5b7573d4e14ee1dff8c414646435a04(lastest) kernel config: https://syzkaller.appspot.com/text?tag=KernelConfig&x=4a65fa9f077ead01 with KASAN enabled compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 ./root@syzkaller:~# ./535 [ 168.288592][ C2] ================================================================== [ 168.290954][ C2] BUG: KASAN: slab-use-after-free in ip_finish_output+0x8d/0x330 [ 168.293040][ C2] Read of size 1 at addr ffff8880349c4012 by task swapper/2/0 [ 168.295066][ C2] [ 168.296007][ C2] CPU: 2 PID: 0 Comm: swapper/2 Not tainted 6.8.0-rc6-02015-ge3350ba4a5b7 #13 [ 168.298646][ C2] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-1.fc38 04/01/2014 [ 168.301143][ C2] Call Trace: [ 168.301993][ C2] <IRQ> [ 168.302726][ C2] dump_stack_lvl+0xee/0x1e0 [ 168.303918][ C2] print_report+0xc4/0x620 [ 168.305260][ C2] ? __virt_addr_valid+0x67/0x5c0 [ 168.306598][ C2] ? __phys_addr+0xd3/0x150 [ 168.308122][ C2] kasan_report+0xda/0x110 [ 168.309283][ C2] ? ip_finish_output+0x8d/0x330 [ 168.310631][ C2] ? ip_finish_output+0x8d/0x330 [ 168.311918][ C2] ip_finish_output+0x8d/0x330 [ 168.313060][ C2] ip_output+0x144/0x2b0 [ 168.313944][ C2] ip_local_out+0xb8/0x1b0 [ 168.314865][ C2] ipvlan_process_v4_outbound+0x3a0/0x500 [ 168.316058][ C2] ? ipvlan_route_v6_outbound+0x4b0/0x4b0 [ 168.317261][ C2] ? ipvlan_get_L3_hdr+0x91/0xda0 [ 168.318312][ C2] ipvlan_queue_xmit+0xdb3/0x11c0 [ 168.319360][ C2] ? print_usage_bug.part.0+0x550/0x550 [ 168.320507][ C2] ? ipvlan_handle_mode_l3+0x150/0x150 [ 168.321671][ C2] ? validate_xmit_xfrm+0x4c0/0x1320 [ 168.322766][ C2] ? netif_skb_features+0x3ca/0xce0 [ 168.323848][ C2] ipvlan_start_xmit+0x4e/0x160 [ 168.324860][ C2] dev_hard_start_xmit+0x141/0x720 [ 168.325923][ C2] sch_direct_xmit+0x1bd/0xc70 [ 168.327068][ C2] ? ktime_get+0x2c3/0x4c0 [ 168.328137][ C2] ? qdisc_dequeue_head+0x290/0x370 [ 168.329317][ C2] ? dev_watchdog+0x940/0x940 [ 168.330387][ C2] ? tbf_dequeue+0x980/0xdc0 [ 168.331454][ C2] __qdisc_run+0x577/0x1ad0 [ 168.332384][ C2] net_tx_action+0x765/0xd10 [ 168.333548][ C2] __do_softirq+0x21a/0x8de [ 168.334486][ C2] ? __lock_text_end+0x3/0x3 [ 168.335434][ C2] irq_exit_rcu+0xb7/0x120 [ 168.336352][ C2] sysvec_apic_timer_interrupt+0x95/0xb0 [ 168.337665][ C2] </IRQ> [ 168.338266][ C2] <TASK> =* repro.c =* #define _GNU_SOURCE #include <arpa/inet.h> #include <dirent.h> #include <endian.h> #include <errno.h> #include <fcntl.h> #include <net/if.h> #include <net/if_arp.h> #include <netinet/in.h> #include <sched.h> #include <signal.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 <time.h> #include <unistd.h> #include <linux/capability.h> #include <linux/genetlink.h> #include <linux/if_addr.h> #include <linux/if_ether.h> #include <linux/if_link.h> #include <linux/if_tun.h> #include <linux/in6.h> #include <linux/ip.h> #include <linux/neighbour.h> #include <linux/net.h> #include <linux/netlink.h> #include <linux/rtnetlink.h> #include <linux/tcp.h> #include <linux/veth.h> static 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 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 void netlink_nest(struct nlmsg* nlmsg, int typ) { struct nlattr* attr = (struct nlattr*)nlmsg->pos; attr->nla_type = typ; nlmsg->pos += sizeof(*attr); nlmsg->nested[nlmsg->nesting++] = attr; } static void netlink_done(struct nlmsg* nlmsg) { struct nlattr* attr = nlmsg->nested[--nlmsg->nesting]; attr->nla_len = nlmsg->pos - (char*)attr; } 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 int netlink_next_msg(struct nlmsg* nlmsg, unsigned int offset, unsigned int total_len) { struct nlmsghdr* hdr = (struct nlmsghdr*)(nlmsg->buf + offset); if (offset == total_len || offset + hdr->nlmsg_len > total_len) return -1; return hdr->nlmsg_len; } static void netlink_add_device_impl(struct nlmsg* nlmsg, const char* type, const char* name, bool up) { struct ifinfomsg hdr; memset(&hdr, 0, sizeof(hdr)); if (up) hdr.ifi_flags = hdr.ifi_change = IFF_UP; netlink_init(nlmsg, RTM_NEWLINK, NLM_F_EXCL | NLM_F_CREATE, &hdr, sizeof(hdr)); if (name) netlink_attr(nlmsg, IFLA_IFNAME, name, strlen(name)); netlink_nest(nlmsg, IFLA_LINKINFO); netlink_attr(nlmsg, IFLA_INFO_KIND, type, strlen(type)); } static void netlink_add_device(struct nlmsg* nlmsg, int sock, const char* type, const char* name) { netlink_add_device_impl(nlmsg, type, name, false); netlink_done(nlmsg); int err = netlink_send(nlmsg, sock); if (err < 0) { } } static void netlink_add_veth(struct nlmsg* nlmsg, int sock, const char* name, const char* peer) { netlink_add_device_impl(nlmsg, "veth", name, false); netlink_nest(nlmsg, IFLA_INFO_DATA); netlink_nest(nlmsg, VETH_INFO_PEER); nlmsg->pos += sizeof(struct ifinfomsg); netlink_attr(nlmsg, IFLA_IFNAME, peer, strlen(peer)); netlink_done(nlmsg); netlink_done(nlmsg); netlink_done(nlmsg); int err = netlink_send(nlmsg, sock); if (err < 0) { } } static void netlink_add_xfrm(struct nlmsg* nlmsg, int sock, const char* name) { netlink_add_device_impl(nlmsg, "xfrm", name, true); netlink_nest(nlmsg, IFLA_INFO_DATA); int if_id = 1; netlink_attr(nlmsg, 2, &if_id, sizeof(if_id)); netlink_done(nlmsg); netlink_done(nlmsg); int err = netlink_send(nlmsg, sock); if (err < 0) { } } static void netlink_add_hsr(struct nlmsg* nlmsg, int sock, const char* name, const char* slave1, const char* slave2) { netlink_add_device_impl(nlmsg, "hsr", name, false); netlink_nest(nlmsg, IFLA_INFO_DATA); int ifindex1 = if_nametoindex(slave1); netlink_attr(nlmsg, IFLA_HSR_SLAVE1, &ifindex1, sizeof(ifindex1)); int ifindex2 = if_nametoindex(slave2); netlink_attr(nlmsg, IFLA_HSR_SLAVE2, &ifindex2, sizeof(ifindex2)); netlink_done(nlmsg); netlink_done(nlmsg); int err = netlink_send(nlmsg, sock); if (err < 0) { } } static void netlink_add_linked(struct nlmsg* nlmsg, int sock, const char* type, const char* name, const char* link) { netlink_add_device_impl(nlmsg, type, name, false); netlink_done(nlmsg); int ifindex = if_nametoindex(link); netlink_attr(nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex)); int err = netlink_send(nlmsg, sock); if (err < 0) { } } static void netlink_add_vlan(struct nlmsg* nlmsg, int sock, const char* name, const char* link, uint16_t id, uint16_t proto) { netlink_add_device_impl(nlmsg, "vlan", name, false); netlink_nest(nlmsg, IFLA_INFO_DATA); netlink_attr(nlmsg, IFLA_VLAN_ID, &id, sizeof(id)); netlink_attr(nlmsg, IFLA_VLAN_PROTOCOL, &proto, sizeof(proto)); netlink_done(nlmsg); netlink_done(nlmsg); int ifindex = if_nametoindex(link); netlink_attr(nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex)); int err = netlink_send(nlmsg, sock); if (err < 0) { } } static void netlink_add_macvlan(struct nlmsg* nlmsg, int sock, const char* name, const char* link) { netlink_add_device_impl(nlmsg, "macvlan", name, false); netlink_nest(nlmsg, IFLA_INFO_DATA); uint32_t mode = MACVLAN_MODE_BRIDGE; netlink_attr(nlmsg, IFLA_MACVLAN_MODE, &mode, sizeof(mode)); netlink_done(nlmsg); netlink_done(nlmsg); int ifindex = if_nametoindex(link); netlink_attr(nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex)); int err = netlink_send(nlmsg, sock); if (err < 0) { } } static void netlink_add_geneve(struct nlmsg* nlmsg, int sock, const char* name, uint32_t vni, struct in_addr* addr4, struct in6_addr* addr6) { netlink_add_device_impl(nlmsg, "geneve", name, false); netlink_nest(nlmsg, IFLA_INFO_DATA); netlink_attr(nlmsg, IFLA_GENEVE_ID, &vni, sizeof(vni)); if (addr4) netlink_attr(nlmsg, IFLA_GENEVE_REMOTE, addr4, sizeof(*addr4)); if (addr6) netlink_attr(nlmsg, IFLA_GENEVE_REMOTE6, addr6, sizeof(*addr6)); netlink_done(nlmsg); netlink_done(nlmsg); int err = netlink_send(nlmsg, sock); if (err < 0) { } } #define IFLA_IPVLAN_FLAGS 2 #define IPVLAN_MODE_L3S 2 #undef IPVLAN_F_VEPA #define IPVLAN_F_VEPA 2 static void netlink_add_ipvlan(struct nlmsg* nlmsg, int sock, const char* name, const char* link, uint16_t mode, uint16_t flags) { netlink_add_device_impl(nlmsg, "ipvlan", name, false); netlink_nest(nlmsg, IFLA_INFO_DATA); netlink_attr(nlmsg, IFLA_IPVLAN_MODE, &mode, sizeof(mode)); netlink_attr(nlmsg, IFLA_IPVLAN_FLAGS, &flags, sizeof(flags)); netlink_done(nlmsg); netlink_done(nlmsg); int ifindex = if_nametoindex(link); netlink_attr(nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex)); int err = netlink_send(nlmsg, sock); if (err < 0) { } } 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 struct nlmsg nlmsg; #define DEVLINK_FAMILY_NAME "devlink" #define DEVLINK_CMD_PORT_GET 5 #define DEVLINK_ATTR_BUS_NAME 1 #define DEVLINK_ATTR_DEV_NAME 2 #define DEVLINK_ATTR_NETDEV_NAME 7 static struct nlmsg nlmsg2; static void initialize_devlink_ports(const char* bus_name, const char* dev_name, const char* netdev_prefix) { struct genlmsghdr genlhdr; int len, total_len, id, err, offset; uint16_t netdev_index; int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC); if (sock == -1) exit(1); int rtsock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); if (rtsock == -1) exit(1); id = netlink_query_family_id(&nlmsg, sock, DEVLINK_FAMILY_NAME, true); if (id == -1) goto error; memset(&genlhdr, 0, sizeof(genlhdr)); genlhdr.cmd = DEVLINK_CMD_PORT_GET; netlink_init(&nlmsg, id, NLM_F_DUMP, &genlhdr, sizeof(genlhdr)); netlink_attr(&nlmsg, DEVLINK_ATTR_BUS_NAME, bus_name, strlen(bus_name) + 1); netlink_attr(&nlmsg, DEVLINK_ATTR_DEV_NAME, dev_name, strlen(dev_name) + 1); err = netlink_send_ext(&nlmsg, sock, id, &total_len, true); if (err < 0) { goto error; } offset = 0; netdev_index = 0; while ((len = netlink_next_msg(&nlmsg, offset, total_len)) != -1) { struct nlattr* attr = (struct nlattr*)(nlmsg.buf + offset + NLMSG_HDRLEN + NLMSG_ALIGN(sizeof(genlhdr))); for (; (char*)attr < nlmsg.buf + offset + len; attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) { if (attr->nla_type == DEVLINK_ATTR_NETDEV_NAME) { char* port_name; char netdev_name[IFNAMSIZ]; port_name = (char*)(attr + 1); snprintf(netdev_name, sizeof(netdev_name), "%s%d", netdev_prefix, netdev_index); netlink_device_change(&nlmsg2, rtsock, port_name, true, 0, 0, 0, netdev_name); break; } } offset += len; netdev_index++; } error: close(rtsock); close(sock); } #define DEV_IPV4 "172.20.20.%d" #define DEV_IPV6 "fe80::%02x" #define DEV_MAC 0x00aaaaaaaaaa static void netdevsim_add(unsigned int addr, unsigned int port_count) { write_file("/sys/bus/netdevsim/del_device", "%u", addr); if (write_file("/sys/bus/netdevsim/new_device", "%u %u", addr, port_count)) { char buf[32]; snprintf(buf, sizeof(buf), "netdevsim%d", addr); initialize_devlink_ports("netdevsim", buf, "netdevsim"); } } #define WG_GENL_NAME "wireguard" enum wg_cmd { WG_CMD_GET_DEVICE, WG_CMD_SET_DEVICE, }; enum wgdevice_attribute { WGDEVICE_A_UNSPEC, WGDEVICE_A_IFINDEX, WGDEVICE_A_IFNAME, WGDEVICE_A_PRIVATE_KEY, WGDEVICE_A_PUBLIC_KEY, WGDEVICE_A_FLAGS, WGDEVICE_A_LISTEN_PORT, WGDEVICE_A_FWMARK, WGDEVICE_A_PEERS, }; enum wgpeer_attribute { WGPEER_A_UNSPEC, WGPEER_A_PUBLIC_KEY, WGPEER_A_PRESHARED_KEY, WGPEER_A_FLAGS, WGPEER_A_ENDPOINT, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL, WGPEER_A_LAST_HANDSHAKE_TIME, WGPEER_A_RX_BYTES, WGPEER_A_TX_BYTES, WGPEER_A_ALLOWEDIPS, WGPEER_A_PROTOCOL_VERSION, }; enum wgallowedip_attribute { WGALLOWEDIP_A_UNSPEC, WGALLOWEDIP_A_FAMILY, WGALLOWEDIP_A_IPADDR, WGALLOWEDIP_A_CIDR_MASK, }; static void netlink_wireguard_setup(void) { const char ifname_a[] = "wg0"; const char ifname_b[] = "wg1"; const char ifname_c[] = "wg2"; const char private_a[] = "\xa0\x5c\xa8\x4f\x6c\x9c\x8e\x38\x53\xe2\xfd\x7a\x70\xae\x0f\xb2\x0f\xa1" "\x52\x60\x0c\xb0\x08\x45\x17\x4f\x08\x07\x6f\x8d\x78\x43"; const char private_b[] = "\xb0\x80\x73\xe8\xd4\x4e\x91\xe3\xda\x92\x2c\x22\x43\x82\x44\xbb\x88\x5c" "\x69\xe2\x69\xc8\xe9\xd8\x35\xb1\x14\x29\x3a\x4d\xdc\x6e"; const char private_c[] = "\xa0\xcb\x87\x9a\x47\xf5\xbc\x64\x4c\x0e\x69\x3f\xa6\xd0\x31\xc7\x4a\x15" "\x53\xb6\xe9\x01\xb9\xff\x2f\x51\x8c\x78\x04\x2f\xb5\x42"; const char public_a[] = "\x97\x5c\x9d\x81\xc9\x83\xc8\x20\x9e\xe7\x81\x25\x4b\x89\x9f\x8e\xd9\x25" "\xae\x9f\x09\x23\xc2\x3c\x62\xf5\x3c\x57\xcd\xbf\x69\x1c"; const char public_b[] = "\xd1\x73\x28\x99\xf6\x11\xcd\x89\x94\x03\x4d\x7f\x41\x3d\xc9\x57\x63\x0e" "\x54\x93\xc2\x85\xac\xa4\x00\x65\xcb\x63\x11\xbe\x69\x6b"; const char public_c[] = "\xf4\x4d\xa3\x67\xa8\x8e\xe6\x56\x4f\x02\x02\x11\x45\x67\x27\x08\x2f\x5c" "\xeb\xee\x8b\x1b\xf5\xeb\x73\x37\x34\x1b\x45\x9b\x39\x22"; const uint16_t listen_a = 20001; const uint16_t listen_b = 20002; const uint16_t listen_c = 20003; const uint16_t af_inet = AF_INET; const uint16_t af_inet6 = AF_INET6; const struct sockaddr_in endpoint_b_v4 = { .sin_family = AF_INET, .sin_port = htons(listen_b), .sin_addr = {htonl(INADDR_LOOPBACK)}}; const struct sockaddr_in endpoint_c_v4 = { .sin_family = AF_INET, .sin_port = htons(listen_c), .sin_addr = {htonl(INADDR_LOOPBACK)}}; struct sockaddr_in6 endpoint_a_v6 = {.sin6_family = AF_INET6, .sin6_port = htons(listen_a)}; endpoint_a_v6.sin6_addr = in6addr_loopback; struct sockaddr_in6 endpoint_c_v6 = {.sin6_family = AF_INET6, .sin6_port = htons(listen_c)}; endpoint_c_v6.sin6_addr = in6addr_loopback; const struct in_addr first_half_v4 = {0}; const struct in_addr second_half_v4 = {(uint32_t)htonl(128 << 24)}; const struct in6_addr first_half_v6 = {{{0}}}; const struct in6_addr second_half_v6 = {{{0x80}}}; const uint8_t half_cidr = 1; const uint16_t persistent_keepalives[] = {1, 3, 7, 9, 14, 19}; struct genlmsghdr genlhdr = {.cmd = WG_CMD_SET_DEVICE, .version = 1}; int sock; int id, err; sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC); if (sock == -1) { return; } id = netlink_query_family_id(&nlmsg, sock, WG_GENL_NAME, true); if (id == -1) goto error; netlink_init(&nlmsg, id, 0, &genlhdr, sizeof(genlhdr)); netlink_attr(&nlmsg, WGDEVICE_A_IFNAME, ifname_a, strlen(ifname_a) + 1); netlink_attr(&nlmsg, WGDEVICE_A_PRIVATE_KEY, private_a, 32); netlink_attr(&nlmsg, WGDEVICE_A_LISTEN_PORT, &listen_a, 2); netlink_nest(&nlmsg, NLA_F_NESTED | WGDEVICE_A_PEERS); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGPEER_A_PUBLIC_KEY, public_b, 32); netlink_attr(&nlmsg, WGPEER_A_ENDPOINT, &endpoint_b_v4, sizeof(endpoint_b_v4)); netlink_attr(&nlmsg, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL, &persistent_keepalives[0], 2); netlink_nest(&nlmsg, NLA_F_NESTED | WGPEER_A_ALLOWEDIPS); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet, 2); netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &first_half_v4, sizeof(first_half_v4)); netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1); netlink_done(&nlmsg); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet6, 2); netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &first_half_v6, sizeof(first_half_v6)); netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1); netlink_done(&nlmsg); netlink_done(&nlmsg); netlink_done(&nlmsg); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGPEER_A_PUBLIC_KEY, public_c, 32); netlink_attr(&nlmsg, WGPEER_A_ENDPOINT, &endpoint_c_v6, sizeof(endpoint_c_v6)); netlink_attr(&nlmsg, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL, &persistent_keepalives[1], 2); netlink_nest(&nlmsg, NLA_F_NESTED | WGPEER_A_ALLOWEDIPS); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet, 2); netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &second_half_v4, sizeof(second_half_v4)); netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1); netlink_done(&nlmsg); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet6, 2); netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &second_half_v6, sizeof(second_half_v6)); netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1); netlink_done(&nlmsg); netlink_done(&nlmsg); netlink_done(&nlmsg); netlink_done(&nlmsg); err = netlink_send(&nlmsg, sock); if (err < 0) { } netlink_init(&nlmsg, id, 0, &genlhdr, sizeof(genlhdr)); netlink_attr(&nlmsg, WGDEVICE_A_IFNAME, ifname_b, strlen(ifname_b) + 1); netlink_attr(&nlmsg, WGDEVICE_A_PRIVATE_KEY, private_b, 32); netlink_attr(&nlmsg, WGDEVICE_A_LISTEN_PORT, &listen_b, 2); netlink_nest(&nlmsg, NLA_F_NESTED | WGDEVICE_A_PEERS); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGPEER_A_PUBLIC_KEY, public_a, 32); netlink_attr(&nlmsg, WGPEER_A_ENDPOINT, &endpoint_a_v6, sizeof(endpoint_a_v6)); netlink_attr(&nlmsg, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL, &persistent_keepalives[2], 2); netlink_nest(&nlmsg, NLA_F_NESTED | WGPEER_A_ALLOWEDIPS); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet, 2); netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &first_half_v4, sizeof(first_half_v4)); netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1); netlink_done(&nlmsg); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet6, 2); netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &first_half_v6, sizeof(first_half_v6)); netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1); netlink_done(&nlmsg); netlink_done(&nlmsg); netlink_done(&nlmsg); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGPEER_A_PUBLIC_KEY, public_c, 32); netlink_attr(&nlmsg, WGPEER_A_ENDPOINT, &endpoint_c_v4, sizeof(endpoint_c_v4)); netlink_attr(&nlmsg, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL, &persistent_keepalives[3], 2); netlink_nest(&nlmsg, NLA_F_NESTED | WGPEER_A_ALLOWEDIPS); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet, 2); netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &second_half_v4, sizeof(second_half_v4)); netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1); netlink_done(&nlmsg); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet6, 2); netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &second_half_v6, sizeof(second_half_v6)); netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1); netlink_done(&nlmsg); netlink_done(&nlmsg); netlink_done(&nlmsg); netlink_done(&nlmsg); err = netlink_send(&nlmsg, sock); if (err < 0) { } netlink_init(&nlmsg, id, 0, &genlhdr, sizeof(genlhdr)); netlink_attr(&nlmsg, WGDEVICE_A_IFNAME, ifname_c, strlen(ifname_c) + 1); netlink_attr(&nlmsg, WGDEVICE_A_PRIVATE_KEY, private_c, 32); netlink_attr(&nlmsg, WGDEVICE_A_LISTEN_PORT, &listen_c, 2); netlink_nest(&nlmsg, NLA_F_NESTED | WGDEVICE_A_PEERS); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGPEER_A_PUBLIC_KEY, public_a, 32); netlink_attr(&nlmsg, WGPEER_A_ENDPOINT, &endpoint_a_v6, sizeof(endpoint_a_v6)); netlink_attr(&nlmsg, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL, &persistent_keepalives[4], 2); netlink_nest(&nlmsg, NLA_F_NESTED | WGPEER_A_ALLOWEDIPS); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet, 2); netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &first_half_v4, sizeof(first_half_v4)); netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1); netlink_done(&nlmsg); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet6, 2); netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &first_half_v6, sizeof(first_half_v6)); netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1); netlink_done(&nlmsg); netlink_done(&nlmsg); netlink_done(&nlmsg); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGPEER_A_PUBLIC_KEY, public_b, 32); netlink_attr(&nlmsg, WGPEER_A_ENDPOINT, &endpoint_b_v4, sizeof(endpoint_b_v4)); netlink_attr(&nlmsg, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL, &persistent_keepalives[5], 2); netlink_nest(&nlmsg, NLA_F_NESTED | WGPEER_A_ALLOWEDIPS); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet, 2); netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &second_half_v4, sizeof(second_half_v4)); netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1); netlink_done(&nlmsg); netlink_nest(&nlmsg, NLA_F_NESTED | 0); netlink_attr(&nlmsg, WGALLOWEDIP_A_FAMILY, &af_inet6, 2); netlink_attr(&nlmsg, WGALLOWEDIP_A_IPADDR, &second_half_v6, sizeof(second_half_v6)); netlink_attr(&nlmsg, WGALLOWEDIP_A_CIDR_MASK, &half_cidr, 1); netlink_done(&nlmsg); netlink_done(&nlmsg); netlink_done(&nlmsg); netlink_done(&nlmsg); err = netlink_send(&nlmsg, sock); if (err < 0) { } error: close(sock); } static void initialize_netdevices(void) { char netdevsim[16]; sprintf(netdevsim, "netdevsim%d", (int)procid); struct { const char* type; const char* dev; } devtypes[] = { {"ip6gretap", "ip6gretap0"}, {"bridge", "bridge0"}, {"vcan", "vcan0"}, {"bond", "bond0"}, {"team", "team0"}, {"dummy", "dummy0"}, {"nlmon", "nlmon0"}, {"caif", "caif0"}, {"batadv", "batadv0"}, {"vxcan", "vxcan1"}, {"veth", 0}, {"wireguard", "wg0"}, {"wireguard", "wg1"}, {"wireguard", "wg2"}, }; const char* devmasters[] = {"bridge", "bond", "team", "batadv"}; struct { const char* name; int macsize; bool noipv6; } devices[] = { {"lo", ETH_ALEN}, {"sit0", 0}, {"bridge0", ETH_ALEN}, {"vcan0", 0, true}, {"tunl0", 0}, {"gre0", 0}, {"gretap0", ETH_ALEN}, {"ip_vti0", 0}, {"ip6_vti0", 0}, {"ip6tnl0", 0}, {"ip6gre0", 0}, {"ip6gretap0", ETH_ALEN}, {"erspan0", ETH_ALEN}, {"bond0", ETH_ALEN}, {"veth0", ETH_ALEN}, {"veth1", ETH_ALEN}, {"team0", ETH_ALEN}, {"veth0_to_bridge", ETH_ALEN}, {"veth1_to_bridge", ETH_ALEN}, {"veth0_to_bond", ETH_ALEN}, {"veth1_to_bond", ETH_ALEN}, {"veth0_to_team", ETH_ALEN}, {"veth1_to_team", ETH_ALEN}, {"veth0_to_hsr", ETH_ALEN}, {"veth1_to_hsr", ETH_ALEN}, {"hsr0", 0}, {"dummy0", ETH_ALEN}, {"nlmon0", 0}, {"vxcan0", 0, true}, {"vxcan1", 0, true}, {"caif0", ETH_ALEN}, {"batadv0", ETH_ALEN}, {netdevsim, ETH_ALEN}, {"xfrm0", ETH_ALEN}, {"veth0_virt_wifi", ETH_ALEN}, {"veth1_virt_wifi", ETH_ALEN}, {"virt_wifi0", ETH_ALEN}, {"veth0_vlan", ETH_ALEN}, {"veth1_vlan", ETH_ALEN}, {"vlan0", ETH_ALEN}, {"vlan1", ETH_ALEN}, {"macvlan0", ETH_ALEN}, {"macvlan1", ETH_ALEN}, {"ipvlan0", ETH_ALEN}, {"ipvlan1", ETH_ALEN}, {"veth0_macvtap", ETH_ALEN}, {"veth1_macvtap", ETH_ALEN}, {"macvtap0", ETH_ALEN}, {"macsec0", ETH_ALEN}, {"veth0_to_batadv", ETH_ALEN}, {"veth1_to_batadv", ETH_ALEN}, {"batadv_slave_0", ETH_ALEN}, {"batadv_slave_1", ETH_ALEN}, {"geneve0", ETH_ALEN}, {"geneve1", ETH_ALEN}, {"wg0", 0}, {"wg1", 0}, {"wg2", 0}, }; int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); if (sock == -1) exit(1); unsigned i; for (i = 0; i < sizeof(devtypes) / sizeof(devtypes[0]); i++) netlink_add_device(&nlmsg, sock, devtypes[i].type, devtypes[i].dev); for (i = 0; i < sizeof(devmasters) / (sizeof(devmasters[0])); i++) { char master[32], slave0[32], veth0[32], slave1[32], veth1[32]; sprintf(slave0, "%s_slave_0", devmasters[i]); sprintf(veth0, "veth0_to_%s", devmasters[i]); netlink_add_veth(&nlmsg, sock, slave0, veth0); sprintf(slave1, "%s_slave_1", devmasters[i]); sprintf(veth1, "veth1_to_%s", devmasters[i]); netlink_add_veth(&nlmsg, sock, slave1, veth1); sprintf(master, "%s0", devmasters[i]); netlink_device_change(&nlmsg, sock, slave0, false, master, 0, 0, NULL); netlink_device_change(&nlmsg, sock, slave1, false, master, 0, 0, NULL); } netlink_add_xfrm(&nlmsg, sock, "xfrm0"); netlink_device_change(&nlmsg, sock, "bridge_slave_0", true, 0, 0, 0, NULL); netlink_device_change(&nlmsg, sock, "bridge_slave_1", true, 0, 0, 0, NULL); netlink_add_veth(&nlmsg, sock, "hsr_slave_0", "veth0_to_hsr"); netlink_add_veth(&nlmsg, sock, "hsr_slave_1", "veth1_to_hsr"); netlink_add_hsr(&nlmsg, sock, "hsr0", "hsr_slave_0", "hsr_slave_1"); netlink_device_change(&nlmsg, sock, "hsr_slave_0", true, 0, 0, 0, NULL); netlink_device_change(&nlmsg, sock, "hsr_slave_1", true, 0, 0, 0, NULL); netlink_add_veth(&nlmsg, sock, "veth0_virt_wifi", "veth1_virt_wifi"); netlink_add_linked(&nlmsg, sock, "virt_wifi", "virt_wifi0", "veth1_virt_wifi"); netlink_add_veth(&nlmsg, sock, "veth0_vlan", "veth1_vlan"); netlink_add_vlan(&nlmsg, sock, "vlan0", "veth0_vlan", 0, htons(ETH_P_8021Q)); netlink_add_vlan(&nlmsg, sock, "vlan1", "veth0_vlan", 1, htons(ETH_P_8021AD)); netlink_add_macvlan(&nlmsg, sock, "macvlan0", "veth1_vlan"); netlink_add_macvlan(&nlmsg, sock, "macvlan1", "veth1_vlan"); netlink_add_ipvlan(&nlmsg, sock, "ipvlan0", "veth0_vlan", IPVLAN_MODE_L2, 0); netlink_add_ipvlan(&nlmsg, sock, "ipvlan1", "veth0_vlan", IPVLAN_MODE_L3S, IPVLAN_F_VEPA); netlink_add_veth(&nlmsg, sock, "veth0_macvtap", "veth1_macvtap"); netlink_add_linked(&nlmsg, sock, "macvtap", "macvtap0", "veth0_macvtap"); netlink_add_linked(&nlmsg, sock, "macsec", "macsec0", "veth1_macvtap"); char addr[32]; sprintf(addr, DEV_IPV4, 14 + 10); struct in_addr geneve_addr4; if (inet_pton(AF_INET, addr, &geneve_addr4) <= 0) exit(1); struct in6_addr geneve_addr6; if (inet_pton(AF_INET6, "fc00::01", &geneve_addr6) <= 0) exit(1); netlink_add_geneve(&nlmsg, sock, "geneve0", 0, &geneve_addr4, 0); netlink_add_geneve(&nlmsg, sock, "geneve1", 1, 0, &geneve_addr6); netdevsim_add((int)procid, 4); netlink_wireguard_setup(); for (i = 0; i < sizeof(devices) / (sizeof(devices[0])); i++) { char addr[32]; sprintf(addr, DEV_IPV4, i + 10); netlink_add_addr4(&nlmsg, sock, devices[i].name, addr); if (!devices[i].noipv6) { sprintf(addr, DEV_IPV6, i + 10); netlink_add_addr6(&nlmsg, sock, devices[i].name, addr); } uint64_t macaddr = DEV_MAC + ((i + 10ull) << 40); netlink_device_change(&nlmsg, sock, devices[i].name, true, 0, &macaddr, devices[i].macsize, NULL); } close(sock); } static void initialize_netdevices_init(void) { int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); if (sock == -1) exit(1); struct { const char* type; int macsize; bool noipv6; bool noup; } devtypes[] = { {"nr", 7, true}, {"rose", 5, true, true}, }; unsigned i; for (i = 0; i < sizeof(devtypes) / sizeof(devtypes[0]); i++) { char dev[32], addr[32]; sprintf(dev, "%s%d", devtypes[i].type, (int)procid); sprintf(addr, "172.30.%d.%d", i, (int)procid + 1); netlink_add_addr4(&nlmsg, sock, dev, addr); if (!devtypes[i].noipv6) { sprintf(addr, "fe88::%02x:%02x", i, (int)procid + 1); netlink_add_addr6(&nlmsg, sock, dev, addr); } int macsize = devtypes[i].macsize; uint64_t macaddr = 0xbbbbbb + ((unsigned long long)i << (8 * (macsize - 2))) + (procid << (8 * (macsize - 1))); netlink_device_change(&nlmsg, sock, dev, !devtypes[i].noup, 0, &macaddr, macsize, NULL); } close(sock); } #define MAX_FDS 30 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; } 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(); initialize_netdevices_init(); if (unshare(CLONE_NEWNET)) { } write_file("/proc/sys/net/ipv4/ping_group_range", "0 65535"); initialize_netdevices(); setup_binderfs(); loop(); exit(1); } static void kill_and_wait(int pid, int* status) { kill(-pid, SIGKILL); kill(pid, SIGKILL); for (int 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) { } } static void setup_test() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); write_file("/proc/self/oom_score_adj", "1000"); } static void close_fds() { for (int fd = 3; fd < MAX_FDS; fd++) close(fd); } static void execute_one(void); #define WAIT_FLAGS __WALL static void loop(void) { int iter = 0; for (;; iter++) { int pid = fork(); if (pid < 0) exit(1); if (pid == 0) { setup_test(); execute_one(); close_fds(); 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 < 5000) continue; kill_and_wait(pid, &status); break; } } } uint64_t r[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0x0}; void execute_one(void) { intptr_t res = 0; res = syscall(__NR_socket, /*domain=*/0x11ul, /*type=*/3ul, /*proto=*/0x300); if (res != -1) r[0] = res; *(uint32_t*)0x20006ffc = 0x200; syscall(__NR_setsockopt, /*fd=*/r[0], /*level=*/0x107, /*optname=*/0xf, /*optval=*/0x20006ffcul, /*optlen=*/0xe50fb6c50bc849c9ul); res = syscall(__NR_socket, /*domain=*/0x10ul, /*type=*/3ul, /*proto=*/0); if (res != -1) r[1] = res; *(uint64_t*)0x20001340 = 0; *(uint32_t*)0x20001348 = 0; *(uint64_t*)0x20001350 = 0x20000800; *(uint64_t*)0x20000800 = 0; *(uint64_t*)0x20000808 = 0; *(uint64_t*)0x20000810 = 0; *(uint64_t*)0x20000818 = 0; *(uint64_t*)0x20000820 = 0; *(uint64_t*)0x20000828 = 0; *(uint64_t*)0x20000830 = 0x200001c0; memcpy((void*)0x200001c0, "\x8f\xc2\x86\x98\x2d\xf8\x34\x00\x25\x8d\x0b\xce\x45\x0d\xcb\x27\x3c" "\x88\x0f\x76\x6d\x6d\x47\xbf\x05\xa0\x14\x6a\x7a\xb1\xcc\xa6\x71\x44" "\x75\xe7\x55\xea\xe9\xcc\x4c\x43\x05", 43); *(uint64_t*)0x20000838 = 0x2b; *(uint64_t*)0x20000840 = 0; *(uint64_t*)0x20000848 = 0; *(uint64_t*)0x20000850 = 0; *(uint64_t*)0x20000858 = 0; *(uint64_t*)0x20000860 = 0; *(uint64_t*)0x20000868 = 0; *(uint64_t*)0x20001358 = 7; *(uint64_t*)0x20001360 = 0; *(uint64_t*)0x20001368 = 0; *(uint32_t*)0x20001370 = 0; *(uint32_t*)0x20001378 = 0; *(uint64_t*)0x20001380 = 0; *(uint32_t*)0x20001388 = 0; *(uint64_t*)0x20001390 = 0; *(uint64_t*)0x20001398 = 0; *(uint64_t*)0x200013a0 = 0; *(uint64_t*)0x200013a8 = 0; *(uint32_t*)0x200013b0 = 0; *(uint32_t*)0x200013b8 = 0; *(uint64_t*)0x200013c0 = 0; *(uint32_t*)0x200013c8 = 0; *(uint64_t*)0x200013d0 = 0; *(uint64_t*)0x200013d8 = 0; *(uint64_t*)0x200013e0 = 0; *(uint64_t*)0x200013e8 = 0; *(uint32_t*)0x200013f0 = 0; *(uint32_t*)0x200013f8 = 0; syscall(__NR_sendmmsg, /*fd=*/r[0], /*mmsg=*/0x20001340ul, /*vlen=*/3ul, /*f=*/0x40000ul); res = syscall(__NR_socket, /*domain=*/0x10ul, /*type=*/0x803ul, /*proto=*/0); if (res != -1) r[2] = res; memcpy((void*)0x20000700, "TIPCv2\000", 7); syz_genetlink_get_family_id(/*name=*/0x20000700, /*fd=*/r[2]); *(uint32_t*)0x20000200 = 0x14; res = syscall(__NR_getsockname, /*fd=*/r[2], /*addr=*/0x20001480ul, /*addrlen=*/0x20000200ul); if (res != -1) r[3] = *(uint32_t*)0x20001484; *(uint64_t*)0x20000000 = 0; *(uint32_t*)0x20000008 = 0; *(uint64_t*)0x20000010 = 0x20000140; *(uint64_t*)0x20000140 = 0x20000500; memcpy((void*)0x20000500, "\x3c\x00\x00\x00\x10\x00\x01\x44\x00\xee\xff\xff\xff\xff\x07\x1a\xf7" "\x00\x00\x00", 20); *(uint32_t*)0x20000514 = r[3]; memcpy((void*)0x20000518, "\x01\x00\x00\x00\x01\x00\x00\x00\x1c\x00\x12\x00\x0c\x00\x01\x00\x62" "\x72\x69\x64\x67\x65", 22); *(uint64_t*)0x20000148 = 0x3c; *(uint64_t*)0x20000018 = 1; *(uint64_t*)0x20000020 = 0; *(uint64_t*)0x20000028 = 0; *(uint32_t*)0x20000030 = 0; syscall(__NR_sendmsg, /*fd=*/r[2], /*msg=*/0x20000000ul, /*f=*/0ul); *(uint64_t*)0x200007c0 = 0; *(uint32_t*)0x200007c8 = 0; *(uint64_t*)0x200007d0 = 0x20000080; *(uint64_t*)0x20000080 = 0x20000180; memcpy((void*)0x20000180, "\x60\x00\x00\x00\x24\x00\x0b\x0e\x00\x00\x00\x00\x00\x80\x00\x00\x00" "\x00\x00\x00", 20); *(uint32_t*)0x20000194 = r[3]; memcpy( (void*)0x20000198, "\x00\x00\x00\x00\xff\xff\xff\xff\x00\x00\x00\x45\x08\x00\x01\x00\x74\x62" "\x66\x00\x34\x00\x02\x00\x08\x00\x06\x00\xa4\x23\x00\x00\x28\x00\x01", 35); *(uint64_t*)0x20000088 = 0x60; *(uint64_t*)0x200007d8 = 1; *(uint64_t*)0x200007e0 = 0; *(uint64_t*)0x200007e8 = 0; *(uint32_t*)0x200007f0 = 0; syscall(__NR_sendmsg, /*fd=*/r[1], /*msg=*/0x200007c0ul, /*f=*/0ul); *(uint16_t*)0x20000040 = 0x11; *(uint16_t*)0x20000042 = htobe16(0); *(uint32_t*)0x20000044 = r[3]; *(uint16_t*)0x20000048 = 1; *(uint8_t*)0x2000004a = 0; *(uint8_t*)0x2000004b = 6; memset((void*)0x2000004c, 170, 5); *(uint8_t*)0x20000051 = 0; memset((void*)0x20000052, 0, 2); syscall(__NR_bind, /*fd=*/r[0], /*addr=*/0x20000040ul, /*addrlen=*/0x14ul); memcpy((void*)0x20000280, "\x41\x03\x09\x5c\xf2\x1d\x48\x04\x07\x02\x02\x00\xc5\x2c\xf7\xc2\x59" "\x75\xe0\x05\xb0\x2f\x08\x00\xeb\x2b\x2f\xf0\xda\xc8\x89\x7c\x6b\x11" "\x87\x77\xfa\xff\xff\xff\x30\x66\x09\x0c\xb6\x00\xc5\x47\x1d\x13\x0a" "\x66\x32\x1a\x54\xe7\xdf\x30\x5f\x80\xa8\x81\x61\xb6\xfd\x8f\x24\x28" "\x6a\x57\xc3\xfe\xff\xff", 74); syscall(__NR_sendto, /*fd=*/r[0], /*buf=*/0x20000280ul, /*len=*/0x5c13ul, /*f=*/0x806ul, /*addr=*/0ul, /*addrlen=*/0x2ful); } 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; } =* repro.txt =* r0 = socket$packet(0x11, 0x3, 0x300) setsockopt$packet_int(r0, 0x107, 0xf, &(0x7f0000006ffc)=0x4000000000000200, 0xe50fb6c50bc849c9) r1 = socket(0x10, 0x3, 0x0) sendmmsg$inet(r0, &(0x7f0000001340)=[{{0x0, 0x0, &(0x7f0000000800)=[{0x0}, {0x0}, {0x0}, {&(0x7f00000001c0)="8fc286982df83400258d0bce450dcb273c880f766d6d47bf05a0146a7ab1cca6714475e755eae9cc4c4305", 0x2b}, {0x0}, {0x0}, {0x0}], 0x7}}, {{0x0, 0x0, 0x0}}, {{0x0, 0x0, 0x0}}], 0x3, 0x40000) r2 = socket(0x10, 0x803, 0x0) syz_genetlink_get_family_id$tipc2(&(0x7f0000000700), r2) getsockname$packet(r2, &(0x7f0000001480)={0x11, 0x0, <r3=>0x0, 0x1, 0x0, 0x6, @broadcast}, &(0x7f0000000200)=0x14) sendmsg$nl_route(r2, &(0x7f0000000000)={0x0, 0x0, &(0x7f0000000140)={&(0x7f0000000500)=ANY=[@ANYBLOB="3c0000001000014400eeffffffff071af7000000", @ANYRES32=r3, @ANYBLOB="01000000010000001c0012000c000100627269646765"], 0x3c}}, 0x0) sendmsg$nl_route_sched(r1, &(0x7f00000007c0)={0x0, 0x0, &(0x7f0000000080)={&(0x7f0000000180)=ANY=[@ANYBLOB="6000000024000b0e000000000080000000000000", @ANYRES32=r3, @ANYBLOB="00000000ffffffff0000004508000100746266003400020008000600a4230000280001"], 0x60}}, 0x0) bind$packet(r0, &(0x7f0000000040)={0x11, 0x0, r3, 0x1, 0x0, 0x6, @dev}, 0x14) sendto$inet6(r0, &(0x7f0000000280)="4103095cf21d480407020200c52cf7c25975e005b02f0800eb2b2ff0dac8897c6b118777faffffff3066090cb600c5471d130a66321a54e7df305f80a88161b6fd8f24286a57c3feffff", 0x5c13, 0x806, 0x0, 0x2f) See aslo https://gist.github.com/xrivendell7/865a5d95635b9dde886a3f3eb156b7f9 BTW, I make a simple analysis for this bug, because there is a similar bug related to net/rose https://syzkaller.appspot.com/bug?extid=677921bcd8c3a67a3df3 do not respone so far, and in the same fuzzing instance, I aslo triggered bug titled "KASAN: null-ptr-deref Read in rose_transmit_link” and "KASAN: slab-use-after-free Read in mini_qdisc_pair_swap”. When analysis the repro.txt above, I notice this syscall getsockname$packet(r2, &(0x7f0000001480)={0x11, 0x0, <r3=>0x0, 0x1, 0x0, 0x6, @broadcast}, &(0x7f0000000200)=0x14) the r3 socket is a AF_PACKET. and also in the repro.txt of bug “KASAN: slab-use-after-free Read in mini_qdisc_pair_swap” below: r0 = socket$nl_route(0x10, 0x3, 0x0) r1 = socket(0x11, 0x800000003, 0x0) bind(r1, &(0x7f0000000080)=@generic={0x11, "0000010000000000080044944eeba71a4976e252922cb18f6e2e2aba000000012e0b3836005404b0e0301a4ce875f2e3ff5f163ee340b7679500800000000000000101013c5811039e15775027ecce66fd792bbf0e5bf5ff1b0816f3f6db1c00010000000000000049740000000000000006ad8e5ecc326d3a09ffc2c654"}, 0x80) getsockname$packet(r1, &(0x7f0000000040)={0x11, 0x0, <r2=>0x0, 0x1, 0x0, 0x6, @dev}, &(0x7f0000000140)=0x14) sendmsg$nl_route_sched(r0, &(0x7f00000001c0)={0x0, 0x0, &(0x7f0000000180)={&(0x7f0000000200)=@newtfilter={0x3c, 0x2c, 0xd27, 0x0, 0x0, {0x0, 0x0, 0x0, r2, {}, {0x0, 0xffff}, {0x2}}, [@filter_kind_options=@f_basic={{0xa}, {0xc, 0x2, [@TCA_BASIC_CLASSID={0x8, 0x1, {0x0, 0xffff}}]}}]}, 0x3c}}, 0x0) r3 = socket$nl_route(0x10, 0x3, 0x0) r4 = socket(0x11, 0x800000003, 0x0) bind(r4, &(0x7f0000000180)=@generic={0x11, "0000010000000000080044944eeba72e2aba000000012e0b3836005404b0e0301a08000000e3ff5f163ee340b7679500800000000000000101013c5811039e15775027ecce66fd792bbf0e5bf5ff1b0816f3f6db1c000100000000000000497400000000000000065ecc326d3a09ffc2c65400"}, 0x80) sendmsg$nl_route_sched(r0, &(0x7f0000000fc0)={&(0x7f0000000240)={0x10, 0x0, 0x0, 0x4}, 0xc, &(0x7f0000000f80)={&(0x7f0000000b80)=@newtaction={0x3ec, 0x30, 0x800, 0x70bd25, 0x25dfdbfc, {}, [{0x3d8, 0x1, [@m_xt={0x298, 0x6, 0x0, 0x0, {{0x7}, {0x1b0, 0x2, 0x0, 0x1, [@TCA_IPT_TARG={0x10f, 0x6, {0x1, 'filter\x00', 0x2, 0x81, "0f6a0e0e9afe6ddcc31e0e668f77ddf9119e50d18216aeb5aa9f203e3cc53be5b5e38b3bd07de80b47aefdbc0f9ccccfb2992b045d841cb60de6b62120e990b2dce06b27b76e8dc05282ff99b491baece2e95564344b923fc333ba942160fcfb32e390a058ac445fa3fdbf222646ad9017c991b55724092280ccf4e7587ed5488546b6d1b76d6266d776c5f4d3e271f54aa8c666f9869f1efbc141f93536baf54e445006cde67ae19b5a108d2b42d60258ad757bdb366664d51fefd60c0f34be08a4d782871a0fe790d97afcf333a1b0b2a8855831183d8158c4ad18f1abcf9157b95700ea"}}, @TCA_IPT_TARG={0x4a, 0x6, {0x1ff, 'filter\x00', 0x0, 0xfff, "218cac2617fc60c1ab2a4db8719d2d06f442070848ab99e8745c05db95b2ffa0"}}, @TCA_IPT_TARG={0x46, 0x6, {0x0, 'mangle\x00', 0x0, 0x8000, "602fb37f5a77780427fe2d2b98797d28cd1b381186073dedb8845115"}}, @TCA_IPT_HOOK={0x8, 0x2, 0x4}]}, {0xc2, 0x6, "5f6c37010c0403cc9b6816f199e64cbd31209b4f9ae1ef492ccf689a4bf45834ebc4b552a254c39ea0145114b3ab87ae5902b061ff0d7d0884c4ef3898c749a30087dd7a337ab1029659c7aded68b95b1d70d2f1e0160a7be432ca197cd9d9ab377f84fccba0de883f107e5bb42d49acedfc21ebbbba51340fa03a8d8256f88597ab465c3e05aa4b95283104da7f194717b52cf3a42a62763d9f5e3903e2b6eae1ff4dbadab08f9d7cbe8424e35d6eee461472fe778afa2cc012cc17862c"}, {0xc, 0x7, {0x0, 0x1}}, {0xc, 0x8, {0x4, 0x2}}}}, @m_ct={0x13c, 0x14, 0x0, 0x0, {{0x7}, {0x4c, 0x2, 0x0, 0x1, [@TCA_CT_PARMS={0x18, 0x1, {0x400, 0xfffffe01, 0x4, 0x5, 0x3ff}}, @TCA_CT_NAT_IPV6_MIN={0x14, 0xb, @dev={0xfe, 0x80, '\x00', 0x42}}, @TCA_CT_LABELS_MASK={0x14, 0x8, "13b512d82312f916d67fdbd5b16d3237"}, @TCA_CT_ACTION={0x6, 0x3, 0x23}]}, {0xcb, 0x6, "cf98aefc95d61dfa6782891a5719a3b681816fb6c044d6c8d89eff2059c7964d8e81f7039162904b509c86c781358268a18d72be977577b1537729daf78cf6ef23a4ff31ebb423f245d3b450010d037143aaf848f11f3bb849900ef8c1e358fb30568cc604e194a413ba6a7e22051d17d6f912153ca7a2a592831f1bd6fc25da70cde15360d10a034504727bc06a576479cde3cd6b5905dbcce6c631d2b0f476a1a9373d37cf20c8b32da1111379ca5897892f996fd80252607fc19370ff7aee4b20c486a04cc7"}, {0xc, 0x7, {0x0, 0x1}}, {0xc, 0x8, {0x2}}}}]}]}, 0x3ec}, 0x1, 0x0, 0x0, 0x40000}, 0x200580c0) getsockname$packet(r4, &(0x7f0000000000)={0x11, 0x0, <r5=>0x0, 0x1, 0x0, 0x6, @dev}, &(0x7f0000000140)=0x14) sendmsg$nl_route_sched(r3, &(0x7f0000000200)={0x0, 0x0, &(0x7f0000000080)={&(0x7f0000000040)=@gettclass={0x24, 0x29, 0x1, 0x0, 0x0, {0x0, 0x0, 0x0, r5, {0x0, 0xffff}, {0x0, 0xffff}}}, 0x24}}, 0x0) pipe(&(0x7f0000000200)={<r6=>0xffffffffffffffff, <r7=>0xffffffffffffffff}) r8 = socket$inet_udp(0x2, 0x2, 0x0) setsockopt$inet6_mreq(0xffffffffffffffff, 0x29, 0x0, &(0x7f0000000000)={@mcast2}, 0x14) close(r8) socket$inet(0x10, 0x2, 0x0) r9 = socket(0x11, 0x800000003, 0x0) bind(r9, &(0x7f0000000080)=@generic={0x11, "0000010000000000080025944eeba71a4976e252922c000000002aba000000012e0b3836005404b0e0301a4ce875f2e0ff5f163ee340b7679500800000000000000101013c5891039e15775027ecce66fd792bbf0e5bf5ff1b0816f3f6db1c00010000000000000049740000000000000006ad8e5ecc326d3a09ffc2c654"}, 0x80) getsockname$packet(r9, &(0x7f0000000100)={0x11, 0x0, <r10=>0x0, 0x1, 0x0, 0x6, @dev}, &(0x7f0000000140)=0x14) sendmsg$nl_route_sched(0xffffffffffffffff, &(0x7f0000000280)={0x0, 0x0, &(0x7f00000002c0)={&(0x7f0000000300)=ANY=[@ANYBLOB="d00800002400ffffff7f00000000ffffa6fffff7", @ANYRES32=r10, @ANYBLOB="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"], 0x3}}, 0x0) write$binfmt_misc(r7, &(0x7f0000000000)=ANY=[], 0xfffffecc) splice(r6, 0x0, r8, 0x0, 0x4ffe0, 0x0) notice the similar getsockname$packet(r4, &(0x7f0000000000)={0x11, 0x0, <r5=>0x0, 0x1, 0x0, 0x6, @dev}, &(0x7f0000000140)=0x14) also related to net/rose. So I believe it maybe also the same bug realted to net/rose AF_PACKET/PF_PACKET socket cluster. If such a security warning is indeed caused, I think it is necessary to fix it quickly. I hope it helps. Best regards. xingwei Lee