From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS, T_DKIMWL_WL_HIGH,USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4B352C28CC5 for ; Thu, 6 Jun 2019 01:19:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 080062083E for ; Thu, 6 Jun 2019 01:19:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559783986; bh=uhnC2/Eq/5roqawjnYtwz3+fYSnQfC36MIoaEuNQDn8=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=NoYl0AdXQK+YLwpP8LjfEQ/du4OzN9iAZbRw6cLELxjcsh6/qMAkR3k0upY3dvLfS Sa3ejhN9z/TRyD2RRA7HktR40qLHqQ7ILWmTcnIOohYN1X0PJhvpHxZ6i/E/d3cdxJ QN4phIGPBSg9dUQADkC+XD5+5TQMXvoCmKSv+TWA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726581AbfFFBTp (ORCPT ); Wed, 5 Jun 2019 21:19:45 -0400 Received: from mail.kernel.org ([198.145.29.99]:36100 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726541AbfFFBTp (ORCPT ); Wed, 5 Jun 2019 21:19:45 -0400 Received: from localhost (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id AFE1F2070B; Thu, 6 Jun 2019 01:19:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559783984; bh=uhnC2/Eq/5roqawjnYtwz3+fYSnQfC36MIoaEuNQDn8=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=GtqZAjqkHg8ZjVsh8CIRAZI6jPy/ZKhykIHVgQ+NsliOQoS1iaLP1KpcYOGVslF3P 7hC5e02bCcl5TSf1u327lSm1d3qHOpMgKiSOEfujsmPmT87MBL2pxZOwfUgLZjMLeD d5H5vzhVto39ZJyHSY5q/r0aDmfjRGKxTm1aw3Bg= Date: Wed, 5 Jun 2019 21:19:42 -0400 From: Sasha Levin To: Daniel Dao Cc: namit@vmware.com, kernel-team , stable@vger.kernel.org Subject: Re: Kernel 4.19.47 with commit 8715ce033eb37f539e73b1570bf56404b21d46cd failed to execute NX-protected page Message-ID: <20190606011942.GH29739@sasha-vm> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org On Wed, Jun 05, 2019 at 03:04:26PM +0100, Daniel Dao wrote: >Hi there, > >We are testing kernel 4.19.47 with some tools utilizing kprobe, >resulting in panics that look like: > >[ 1085.318031] kernel tried to execute NX-protected page - exploit >attempt? (uid: 65534) >[ 1085.334028] BUG: unable to handle kernel paging request at ffffffffc0428000 >[ 1085.349128] PGD 13a3e10067 P4D 13a3e10067 PUD 13a3e12067 PMD >c1e860067 PTE 8000000bbd075061 >[ 1085.365779] Oops: 0011 [#1] SMP KASAN PTI >[ 1085.377879] CPU: 30 PID: 29734 Comm: nginx-fl Tainted: G B >O 4.19.47-cloudflare-kasan-2019.6.0 #2019.6.0 >[ 1085.396652] Hardware name: Quanta Computer Inc QuantaPlex >T41S-2U/S2S-MB, BIOS S2S_3B10.03 06/21/2018 >[ 1085.414041] RIP: 0010:0xffffffffc0428000 >[ 1085.425965] Code: Bad RIP value. >[ 1085.436832] RSP: 0018:ffff88a015e2fb18 EFLAGS: 00010246 >[ 1085.449853] RAX: 0000000000000003 RBX: ffff889f73448900 RCX: 0000000000000218 >[ 1085.464719] RDX: ffff889fe4893c00 RSI: 0000000000000002 RDI: ffff889f73448900 >[ 1085.479626] RBP: ffff88a015e2fe18 R08: 0000000000000006 R09: 0000000000000000 >[ 1085.494677] R10: 000000008a08850a R11: 0000000000000000 R12: ffff889f7344890c >[ 1085.509890] R13: ffff889f73448c54 R14: ffff889f73448c7a R15: 0000000000002c19 >[ 1085.525252] FS: 00007f51582f5680(0000) GS:ffff88a03fb80000(0000) >knlGS:0000000000000000 >[ 1085.541810] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >[ 1085.555812] CR2: ffffffffc0427fd6 CR3: 0000002039fee004 CR4: 00000000001606e0 >[ 1085.571154] Call Trace: >[ 1085.581676] ? tcp_set_state+0x5/0x5b0 >[ 1085.593532] ? tcp_v4_connect+0xbd7/0x2000 >[ 1085.605809] ? tcp_sk_init+0x1220/0x1220 >[ 1085.617810] ? selinux_socket_connect_helper.isra.55+0x277/0x400 >[ 1085.631808] ? sock_poll+0x218/0x300 >[ 1085.643407] ? selinux_netcache_avc_callback+0x30/0x30 >[ 1085.656701] ? __inet_stream_connect+0x630/0xbd0 >[ 1085.669508] ? expand_files.part.9+0x640/0x640 >[ 1085.682145] ? ipip_gro_complete+0x110/0x110 >[ 1085.694627] ? __inet_stream_connect+0xbd0/0xbd0 >[ 1085.707397] ? inet_stream_connect+0x53/0xa0 >[ 1085.719830] ? __sys_connect+0x1f6/0x270 >[ 1085.731964] ? __ia32_sys_accept+0xb0/0xb0 >[ 1085.744201] ? mutex_lock+0x85/0xe0 >[ 1085.755815] ? ep_show_fdinfo+0x3c0/0x3c0 >[ 1085.767916] ? syscall_trace_enter+0x566/0xc30 >[ 1085.780429] ? __x64_sys_epoll_ctl+0x237/0x1080 >[ 1085.792883] ? exit_to_usermode_loop+0x140/0x140 >[ 1085.805425] ? __audit_syscall_exit+0x73e/0xa30 >[ 1085.817925] ? __x64_sys_connect+0x6f/0xb0 >[ 1085.829915] ? do_syscall_64+0x8e/0x280 >[ 1085.841539] ? prepare_exit_to_usermode+0xe1/0x140 >[ 1085.854067] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 >[ 1085.867000] Modules linked in: xt_length xt_connlimit nf_conncount >xt_hashlimit iptable_security sch_fq md_mod dm_crypt algif_skcipher >af_alg dm_mod dax ip6table_nat nf_nat_ipv6 ip6table_mangle >ip6table_security ip6table_raw xt_nat iptable_nat nf_nat_ipv4 nf_nat >xt_TPROXY nf_tproxy_ipv6 nf_tproxy_ipv4 xt_connmark iptable_mangle >xt_owner ip6table_filter ip6_tables xt_CT xt_socket nf_socket_ipv4 >nf_socket_ipv6 iptable_raw nfnetlink_log xt_NFLOG xt_bpf xt_comment >xt_conntrack xt_mark xt_multiport xt_set xt_tcpudp ipt_GLBREDIRECT(O) >nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 fou ip6_udp_tunnel >udp_tunnel iptable_filter bpfilter ip_set_hash_netport ip_set_hash_net >ip_set_hash_ip ip_set nfnetlink sit ipip tunnel4 ip_tunnel tun 8021q >garp stp mrp llc sb_edac x86_pkg_temp_thermal kvm_intel kvm irqbypass >[ 1085.996378] crc32_pclmul crc32c_intel pcbc aesni_intel aes_x86_64 >ipmi_ssif crypto_simd cryptd glue_helper intel_cstate intel_uncore >sfc(O) intel_rapl_perf tpm_tis tpm_tis_core mdio tpm ipmi_si >ipmi_devintf ipmi_msghandler efivarfs ip_tables x_tables > >Reproducible steps on my local machine are as follow: >1. Run kernel 4.19.47 >2. We are going to test kprobe on tcp_set_state using >https://github.com/iovisor/bcc/blob/master/tools/tcplife.py. But >probably any workload utilizing kprobe would work > - Run some workload that creating tcp connections. I'm runing >`python -m SimpleHTTPServer` and `wrk -d60s -c10 >http://localhost:8000` > - Run the script >https://github.com/iovisor/bcc/blob/master/tools/tcplife.py. Expect it >to not crash the kernel and producing some output > >Reverting commit 8715ce033eb37f539e73b1570bf56404b21d46cd makes it >work for me locally. I also tested kernel >5.2.0-rc3-00024-g788a024921c4 locally (latest Linus tree) and not >seeing the issue, so maybe somewhere along the backporting process, we >failed to backport all the required patches ? Uh, that might indeed be the case. Could you try cherry picking the following 3 patches on top of your 4.19 tree and trying again? git cherry-pick d2a68c4effd821f0871d20368f76b609349c8a3b 3c0dab44e22782359a0a706cbce72de99a22aa75 7298e24f904224fa79eb8fd7e0fbd78950ccf2db -- Thanks, Sasha