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Message-ID: <cf1a0f5d-b628-4b1d-b21b-f40d5bb26771@linux.dev>
Date: Tue, 5 Mar 2024 04:31:53 +0100
From: Zhu Yanjun <yanjun.zhu@...ux.dev>
To: xingwei lee <xrivendell7@...il.com>,
syzbot+a2e2735f09ebb9d95bd1@...kaller.appspotmail.com
Cc: jgg@...pe.ca, leon@...nel.org, linux-kernel@...r.kernel.org,
linux-rdma@...r.kernel.org, netdev@...r.kernel.org,
syzkaller-bugs@...glegroups.com, samsun1006219@...il.com
Subject: Re: [syzbot] [rdma?] KASAN: slab-use-after-free Read in
rdma_resolve_route
在 2024/3/4 5:43, xingwei lee 写道:
> Hello, Yanjun I reproduced this bug and comfired, it may help your to
> test your patch.
> As always, I uploaded it here.
Got it. I will make tests with it.
Thanks a lot.
Zhu Yanjun
>
> If you fix this issue, please add the following tag to the reporter or
> reproducer:
> Reported-by: xingwei lee <xrivendell7@...il.com>
> Reported-by: sam sun <samsun1006219@...il.com>
>
> 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@...kaller:~# ./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
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