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=-8.7 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 CDD21C433E0 for ; Mon, 11 Jan 2021 15:31:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7E7BB229CA for ; Mon, 11 Jan 2021 15:31:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730537AbhAKPa5 (ORCPT ); Mon, 11 Jan 2021 10:30:57 -0500 Received: from mail-io1-f71.google.com ([209.85.166.71]:48714 "EHLO mail-io1-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728048AbhAKPa4 (ORCPT ); Mon, 11 Jan 2021 10:30:56 -0500 Received: by mail-io1-f71.google.com with SMTP id 191so12766306iob.15 for ; Mon, 11 Jan 2021 07:30:40 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=yDdM1YuzlRSxHmushVuEYsuGmbOyLKabLgjSNNrBhjc=; b=W0emknvPnF3aE6VgAohiSpyZeN927euzVWFt6dSUweHsuehG2urHsAB1HTaMcjqnya lj+YRl8E27brUInB9Un9yBHUSmbqhgc8Gw2SMLUIAWjtuZjQU35xn81L1oEYpLldeLBL UgrBI0STBQSrv5Ei21GYGlVTLgrt/CGRnBHpAAirhEySo/VX9WqBQrWpWKktJUztNW2G bcqiI+ak7O+6cE/nTfdD0hk6Ph8SwK4NaJZTQb1B++nsO0vvnJPLaKaYw8yd0x+4s/ne wLb0A5QQszAlealkqXc3gwoGWUkQ4I5m4Xu24N4XfGhilbhJ/zzx/pzNwa/qMIV9cuIt 38fA== X-Gm-Message-State: AOAM533qygKi/P8PBAHNxIePdW/zcCCEUFXEzQt48/qUtFgkwW24hXOk azTEDhsSJJ5I5vfZyVH4D+enCtj3hC5XWuMDtQab0wB8rEGS X-Google-Smtp-Source: ABdhPJzZ+3a0xbrJgD3OkN1v1dn3EycFYpNWWAsHBUQt32IhJnImsR5xZJXY35DagJYk6/HKQpuwOgZ8fj3xsusPnrFHsYg3D3pG MIME-Version: 1.0 X-Received: by 2002:a92:d44e:: with SMTP id r14mr12393751ilm.299.1610379015503; Mon, 11 Jan 2021 07:30:15 -0800 (PST) Date: Mon, 11 Jan 2021 07:30:15 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000002c458f05b8a195cf@google.com> Subject: KMSAN: uninit-value in __nla_validate_parse (2) From: syzbot To: davem@davemloft.net, glider@google.com, jhs@mojatatu.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, xiyou.wangcong@gmail.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: 73d62e81 kmsan: random: prevent boot-time reports in _mix_.. git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=153a38f7500000 kernel config: https://syzkaller.appspot.com/x/.config?x=2cdf4151c9653e32 dashboard link: https://syzkaller.appspot.com/bug?extid=2624e3778b18fc497c92 compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project.git ca2dcbd030eadbf0aa9b660efe864ff08af6e18b) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17ef8c3f500000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12bee8f7500000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2624e3778b18fc497c92@syzkaller.appspotmail.com netlink: 4 bytes leftover after parsing attributes in process `syz-executor224'. ===================================================== BUG: KMSAN: uninit-value in nla_ok include/net/netlink.h:1159 [inline] BUG: KMSAN: uninit-value in __nla_validate_parse+0x5fd/0x4e00 lib/nlattr.c:576 CPU: 0 PID: 8270 Comm: syz-executor224 Not tainted 5.10.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x21c/0x280 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197 nla_ok include/net/netlink.h:1159 [inline] __nla_validate_parse+0x5fd/0x4e00 lib/nlattr.c:576 __nla_parse+0x141/0x150 lib/nlattr.c:685 nla_parse_nested include/net/netlink.h:1212 [inline] fl_set_erspan_opt+0x39a/0xe60 net/sched/cls_flower.c:1206 fl_set_enc_opt net/sched/cls_flower.c:1365 [inline] fl_set_key+0x810d/0xbb60 net/sched/cls_flower.c:1642 fl_set_parms net/sched/cls_flower.c:1880 [inline] fl_change+0x1226/0x7ae0 net/sched/cls_flower.c:1979 tc_new_tfilter+0x37c1/0x58e0 net/sched/cls_api.c:2129 rtnetlink_rcv_msg+0xe94/0x18b0 net/core/rtnetlink.c:5553 netlink_rcv_skb+0x70a/0x820 net/netlink/af_netlink.c:2494 rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:5580 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x11da/0x14b0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x173c/0x1840 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg net/socket.c:671 [inline] ____sys_sendmsg+0xc7a/0x1240 net/socket.c:2353 ___sys_sendmsg net/socket.c:2407 [inline] __sys_sendmmsg+0xa56/0x1060 net/socket.c:2497 __do_sys_sendmmsg net/socket.c:2526 [inline] __se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2523 __x64_sys_sendmmsg+0x56/0x70 net/socket.c:2523 do_syscall_64+0x9f/0x140 arch/x86/entry/common.c:48 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x441739 Code: e8 5c ad 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 bb 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffca52cefc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441739 RDX: 010efe10675dec16 RSI: 0000000020000200 RDI: 0000000000000003 RBP: 00007ffca52cefd0 R08: 0000000120080522 R09: 0000000120080522 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a2a70 R13: 0000000000402610 R14: 0000000000000000 R15: 0000000000000000 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline] kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76 slab_alloc_node mm/slub.c:2906 [inline] __kmalloc_node_track_caller+0xc61/0x15f0 mm/slub.c:4512 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0x309/0xae0 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1094 [inline] netlink_alloc_large_skb net/netlink/af_netlink.c:1176 [inline] netlink_sendmsg+0xdb8/0x1840 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg net/socket.c:671 [inline] ____sys_sendmsg+0xc7a/0x1240 net/socket.c:2353 ___sys_sendmsg net/socket.c:2407 [inline] __sys_sendmmsg+0xa56/0x1060 net/socket.c:2497 __do_sys_sendmmsg net/socket.c:2526 [inline] __se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2523 __x64_sys_sendmmsg+0x56/0x70 net/socket.c:2523 do_syscall_64+0x9f/0x140 arch/x86/entry/common.c:48 entry_SYSCALL_64_after_hwframe+0x44/0xa9 ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches