From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-173.mta0.migadu.com (out-173.mta0.migadu.com [91.218.175.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6972F17C6C; Tue, 5 Mar 2024 03:32:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.173 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709609527; cv=none; b=n/14PZZYQp5DzxsjpIfPK1ZuNo5EK24B8A4Rw65dkzFedyTPsaE3QseNKQKs3YfmQ18441wvYnU1pl6jLhCeiaVALF47yelwL82WWxcOt7wPuhRC3duWvBVHuHpDZCqEYk1VbgWl3T16hw7nUux7l8iKX7smgKDAdkvbmZr3zIQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709609527; c=relaxed/simple; bh=CwLa6d9XZ/eXs12HB3ta+FGJmRETNGxPzwdCi3stNe8=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=uy6dURRwZ5t3UkqzhdgbE9L+lPqwPH/Xzp2ZLqwBEv9B1nIa0M3moHMiUa6E+6XapwC9mC3wUKpof8S/moq66PVHL9WOk4TVRlBAw5nMVLrniL4Etqtoddg/NDp+NsCC3s6F5JR8ZF4qSUKxP6jYddOWL/HsMv9g6I4glPDzOss= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=Mx2kdF1h; arc=none smtp.client-ip=91.218.175.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="Mx2kdF1h" Message-ID: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1709609522; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=QbRJ/BSgopqyuTR8FU1tsSpomzIy9inLr1mA61k79Nk=; b=Mx2kdF1hzykk+cRszXYjaTe22ZYYbxHArv1Pg/SWrRMlaoWF7ySo1zHSi4Ccr8DFz9Wdcx Ri2ROURwt/gL4mTzx5jqbsYHRABPte6WTEGwKr8wrbuoNlsupyMIcOyS8mDZVitDMZjsuI dit3UffGrMgUCE8lQfGPrpjubfPEH54= Date: Tue, 5 Mar 2024 04:31:53 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Subject: Re: [syzbot] [rdma?] KASAN: slab-use-after-free Read in rdma_resolve_route To: xingwei lee , syzbot+a2e2735f09ebb9d95bd1@syzkaller.appspotmail.com Cc: jgg@ziepe.ca, leon@kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, samsun1006219@gmail.com References: X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Zhu Yanjun In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT 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 > Reported-by: sam sun > > I use the same configuation with syzbot dashboard. > kernel version: linux-next 2c3b09aac00d7835023bbc4473ee06696be64fa8 > kernel config: 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] > [ 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] > > > =* repro.c =* > #define _GNU_SOURCE > > #include > #include > #include > #include > #include > #include > #include > #include > #include > #include > #include > #include > #include > #include > #include > #include > #include > #include > #include > #include > #include > #include > #include > #include > #include > #include > #include > #include > > #include > #include > #include > #include > #include > #include > #include > #include > #include > #include > #include > #include > #include > #include > > 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