Hello, Yanjun I reproduced this bug and comfired, it may help your to test your patch. As always, I uploaded it here. If you fix this issue, please add the following tag to the reporter or reproducer: Reported-by: xingwei lee <xrivendell7@xxxxxxxxx> Reported-by: sam sun <samsun1006219@xxxxxxxxx> I use the same configuation with syzbot dashboard. kernel version: linux-next 2c3b09aac00d7835023bbc4473ee06696be64fa8 kernel config: syzkaller.appspot.com/text?tag=KernelConfig&x=176d2dcbf8ba7017 <http://syzkaller.appspot.com/text?tag=KernelConfig&x=176d2dcbf8ba7017> with KASAN enabled compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Likewise, this bug has more than one title, in my environment， these titles are also relevant to this bug: KASAN: slab-use-after-free Read in cma_netevent_callback KASAN: slab-use-after-free Read in _destroy_id KASAN: slab-use-after-free in cma_add_id_to_tree KASAN: slab-use-after-free in compare_netdev_and_ip root@syzkaller:~# ./925-7 [ 364.962016][ T8201] infiniband syz1: set active [ 364.963857][ T8201] infiniband syz1: added syz_tun [ 365.004959][ T8201] RDS/IB: syz1: added [ 365.006131][ T8201] smc: adding ib device syz1 with port count 1 [ 365.007313][ T8201] smc: ib device syz1 port 1 has pnetid [ 365.170043][ T8210] syz1: rxe_newlink: already configured on syz_tun [ 365.190827][ T8211] syz1: rxe_newlink: already configured on syz_tun [ 365.213461][ T8212] syz1: rxe_newlink: already configured on syz_tun [ 365.232342][ T8213] syz1: rxe_newlink: already configured on syz_tun [ 365.243876][ T8214] syz1: rxe_newlink: already configured on syz_tun [ 365.258450][ T8215] syz1: rxe_newlink: already configured on syz_tun [ 365.287755][ T8216] syz1: rxe_newlink: already configured on syz_tun [ 365.307337][ T8217] syz1: rxe_newlink: already configured on syz_tun [ 365.325342][ T8218] syz1: rxe_newlink: already configured on syz_tun [ 365.337734][ T8219] syz1: rxe_newlink: already configured on syz_tun [ 366.230237][ T8278] ================================================================== [ 366.231886][ T8278] BUG: KASAN: slab-use-after-free in rdma_resolve_route+0x2524/0x32a0 [ 366.234250][ T8278] Read of size 4 at addr ffff88801ff02184 by task 925-7/8278 [ 366.235595][ T8278] [ 366.236068][ T8278] CPU: 0 PID: 8278 Comm: 925-7 Not tainted 6.8.0-rc4-next-20240214 #1 [ 366.237492][ T8278] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 366.239327][ T8278] Call Trace: [ 366.239941][ T8278] <TASK> [ 366.240469][ T8278] dump_stack_lvl+0x250/0x380 [ 366.242198][ T8278] ? __pfx_dump_stack_lvl+0x10/0x10 [ 366.243109][ T8278] ? __pfx__printk+0x10/0x10 [ 366.243934][ T8278] ? _printk+0xda/0x120 [ 366.244679][ T8278] ? __virt_addr_valid+0x19b/0x580 [ 366.245583][ T8278] ? __virt_addr_valid+0x19b/0x580 [ 366.246482][ T8278] print_report+0x169/0x550 [ 366.247290][ T8278] ? __virt_addr_valid+0x19b/0x580 [ 366.248202][ T8278] ? __virt_addr_valid+0x19b/0x580 [ 366.249100][ T8278] ? __virt_addr_valid+0x4a8/0x580 [ 366.250003][ T8278] ? __phys_addr+0xc3/0x180 [ 366.250822][ T8278] ? rdma_resolve_route+0x2524/0x32a0 [ 366.251840][ T8278] kasan_report+0x143/0x180 [ 366.252635][ T8278] ? _raw_spin_lock_irqsave+0xe1/0x120 [ 366.253586][ T8278] ? rdma_resolve_route+0x2524/0x32a0 [ 366.254542][ T8278] rdma_resolve_route+0x2524/0x32a0 [ 366.255476][ T8278] ? __mutex_lock+0x2ef/0xd70 [ 366.256304][ T8278] ? __pfx_rdma_resolve_route+0x10/0x10 [ 366.257284][ T8278] ? __pfx___mutex_lock+0x10/0x10 [ 366.258168][ T8278] ? ucma_get_ctx+0x29f/0x3b0 [ 366.259002][ T8278] ? __pfx_ucma_get_ctx+0x10/0x10 [ 366.259901][ T8278] ? __might_fault+0xcf/0x130 [ 366.260718][ T8278] ucma_resolve_route+0x1c3/0x330 [ 366.261581][ T8278] ? __pfx_ucma_resolve_route+0x10/0x10 [ 366.262524][ T8278] ? __might_fault+0xcf/0x130 [ 366.263324][ T8278] ? __pfx_ucma_resolve_route+0x10/0x10 [ 366.264273][ T8278] ucma_write+0x2f0/0x440 [ 366.264998][ T8278] ? __pfx_ucma_write+0x10/0x10 [ 366.265802][ T8278] ? bpf_lsm_file_permission+0xe/0x20 [ 366.266701][ T8278] ? rw_verify_area+0x1e7/0x5b0 [ 366.267543][ T8278] ? __pfx_ucma_write+0x10/0x10 [ 366.268341][ T8278] vfs_write+0x2b3/0xcf0 [ 366.269044][ T8278] ? kasan_quarantine_put+0xdc/0x230 [ 366.269917][ T8278] ? lockdep_hardirqs_on+0x99/0x150 [ 366.270784][ T8278] ? __pfx_vfs_write+0x10/0x10 [ 366.271587][ T8278] ? do_sys_openat2+0x160/0x1c0 [ 366.272398][ T8278] ? __pfx_do_sys_openat2+0x10/0x10 [ 366.273264][ T8278] ? __fdget_pos+0x1ab/0x340 [ 366.274037][ T8278] ksys_write+0x18e/0x2d0 [ 366.274764][ T8278] ? __pfx_ksys_write+0x10/0x10 [ 366.275579][ T8278] ? do_syscall_64+0x10a/0x240 [ 366.276380][ T8278] ? do_syscall_64+0xb6/0x240 [ 366.277163][ T8278] do_syscall_64+0xfb/0x240 [ 366.277941][ T8278] entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 366.278936][ T8278] RIP: 0033:0x437e19 [ 366.279595][ T8278] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 d1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8 [ 366.282676][ T8278] RSP: 002b:00007fffdedc7398 EFLAGS: 00000207 ORIG_RAX: 0000000000000001 [ 366.284047][ T8278] RAX: ffffffffffffffda RBX: 00000000200001f8 RCX: 0000000000437e19 [ 366.285331][ T8278] RDX: 0000000000000010 RSI: 0000000020000440 RDI: 0000000000000004 [ 366.286615][ T8278] RBP: 00007fffdedc73c0 R08: 0000000000000000 R09: 0000000000000000 [ 366.287918][ T8278] R10: 0000000000000000 R11: 0000000000000207 R12: 0000000000000001 [ 366.289206][ T8278] R13: 00007fffdedc75e8 R14: 0000000000000001 R15: 0000000000000001 [ 366.290513][ T8278] </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/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 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 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 int read_tun(char* data, int size) { if (tunfd < 0) return -1; int rv = read(tunfd, data, size); if (rv < 0) { if (errno == EAGAIN || errno == EBADFD) return -1; exit(1); } return rv; } static void flush_tun() { char data[1000]; while (read_tun(&data[0], sizeof(data)) != -1) { } } #define MAX_FDS 30 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); } 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"); flush_tun(); } 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[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; res = syscall(__NR_socket, /*domain=*/0x10ul, /*type=*/3ul, /*proto=*/0x14); if (res != -1) r[0] = res; *(uint64_t*)0x20000180 = 0; *(uint32_t*)0x20000188 = 0; *(uint64_t*)0x20000190 = 0x20000140; *(uint64_t*)0x20000140 = 0x20000080; *(uint32_t*)0x20000080 = 0x38; *(uint16_t*)0x20000084 = 0x1403; *(uint16_t*)0x20000086 = 1; *(uint32_t*)0x20000088 = 0; *(uint32_t*)0x2000008c = 0; *(uint16_t*)0x20000090 = 9; *(uint16_t*)0x20000092 = 2; memcpy((void*)0x20000094, "syz1\000", 5); *(uint16_t*)0x2000009c = 8; *(uint16_t*)0x2000009e = 0x41; memcpy((void*)0x200000a0, "rxe\000", 4); *(uint16_t*)0x200000a4 = 0x14; *(uint16_t*)0x200000a6 = 0x33; memcpy((void*)0x200000a8, "syz_tun\000\000\000\000\000\000\000\000\000", 16); *(uint64_t*)0x20000148 = 0x38; *(uint64_t*)0x20000198 = 1; *(uint64_t*)0x200001a0 = 0; *(uint64_t*)0x200001a8 = 0; *(uint32_t*)0x200001b0 = 0; syscall(__NR_sendmsg, /*fd=*/r[0], /*msg=*/0x20000180ul, /*f=*/0ul); memcpy((void*)0x20000100, "/dev/infiniband/rdma_cm\000", 24); res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x20000100ul, /*flags=*/2ul, /*mode=*/0ul); if (res != -1) r[1] = res; *(uint32_t*)0x20000080 = 0; *(uint16_t*)0x20000084 = 0x18; *(uint16_t*)0x20000086 = 0xfa00; *(uint64_t*)0x20000088 = 0; *(uint64_t*)0x20000090 = 0x200000c0; *(uint16_t*)0x20000098 = 0x106; *(uint8_t*)0x2000009a = 0; memset((void*)0x2000009b, 0, 5); res = syscall(__NR_write, /*fd=*/r[1], /*data=*/0x20000080ul, /*len=*/0x20ul); if (res != -1) r[2] = *(uint32_t*)0x200000c0; *(uint32_t*)0x200003c0 = 3; *(uint16_t*)0x200003c4 = 0x40; *(uint16_t*)0x200003c6 = 0xfa00; *(uint16_t*)0x200003c8 = 0xa; *(uint16_t*)0x200003ca = htobe16(0x4e24); *(uint32_t*)0x200003cc = htobe32(1); *(uint8_t*)0x200003d0 = -1; *(uint8_t*)0x200003d1 = 2; memset((void*)0x200003d2, 0, 13); *(uint8_t*)0x200003df = 1; *(uint32_t*)0x200003e0 = 9; *(uint16_t*)0x200003e4 = 0xa; *(uint16_t*)0x200003e6 = htobe16(0); *(uint32_t*)0x200003e8 = htobe32(6); *(uint8_t*)0x200003ec = 0xfe; *(uint8_t*)0x200003ed = 0x80; memset((void*)0x200003ee, 0, 13); *(uint8_t*)0x200003fb = 0xbb; *(uint32_t*)0x200003fc = 0xfffff000; *(uint32_t*)0x20000400 = r[2]; *(uint32_t*)0x20000404 = 2; syscall(__NR_write, /*fd=*/r[1], /*data=*/0x200003c0ul, /*len=*/0x48ul); *(uint32_t*)0x20000140 = 0x15; *(uint16_t*)0x20000144 = 0x110; *(uint16_t*)0x20000146 = 0xfa00; *(uint32_t*)0x20000148 = r[2]; *(uint32_t*)0x2000014c = 0; *(uint16_t*)0x20000150 = 0; *(uint16_t*)0x20000152 = 0x30; *(uint32_t*)0x20000154 = 0; *(uint16_t*)0x20000158 = 0x1b; *(uint16_t*)0x2000015a = htobe16(0); *(uint32_t*)0x2000015c = htobe32(0); memset((void*)0x20000160, 0, 16); *(uint32_t*)0x20000170 = 0; *(uint16_t*)0x200001d8 = 0x1b; *(uint16_t*)0x200001da = htobe16(0); *(uint32_t*)0x200001dc = htobe32(0); memset((void*)0x200001e0, 0, 16); *(uint64_t*)0x200001f0 = htobe64(0); *(uint64_t*)0x200001f8 = htobe64(0); *(uint64_t*)0x20000200 = 0; syscall(__NR_write, /*fd=*/r[1], /*data=*/0x20000140ul, /*len=*/0x118ul); *(uint32_t*)0x20000440 = 4; *(uint16_t*)0x20000444 = 8; *(uint16_t*)0x20000446 = 0xfa00; *(uint32_t*)0x20000448 = r[2]; *(uint32_t*)0x2000044c = 0xffff741a; syscall(__NR_write, /*fd=*/r[1], /*data=*/0x20000440ul, /*len=*/0x10ul); } int main(void) { syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); do_sandbox_none(); return 0; } and also https://gist.github.com/xrivendell7/080e44fad03c27df3152ff3bcc8a8385 I hope it helps. Best regards. xingwei Lee
