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=-4.0 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 AC71BC433E1 for ; Thu, 13 Aug 2020 03:45:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 904092053B for ; Thu, 13 Aug 2020 03:45:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726723AbgHMDpY (ORCPT ); Wed, 12 Aug 2020 23:45:24 -0400 Received: from mail-io1-f71.google.com ([209.85.166.71]:45005 "EHLO mail-io1-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726696AbgHMDpY (ORCPT ); Wed, 12 Aug 2020 23:45:24 -0400 Received: by mail-io1-f71.google.com with SMTP id m12so3158574iov.11 for ; Wed, 12 Aug 2020 20:45:23 -0700 (PDT) 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:in-reply-to:message-id:subject :from:to; bh=5fOerBOgtCPzRD6DaJSK75fAycF0jkD27NVs0k5zNK8=; b=lBCOaYtaArhCsTIo9vR6/bl7A/4PEXRRYyMTK7D9X3IIVefYT16jeTAeHDFqjSwJz/ BrHnz4TD6vXytfDyBuuqqzSi/KiPBtrcBkayrpPnS5qJaXVY35Wx6aNBTSHYYk+B5sPl I8ShracgiJ1yN0IjzTAIaLCxNrHQFDXGnS2kuxff9u9BsO6THkvXAr+vkYRbZFP1a2UE V98PL0zmazpEd5at5ror7thkSHgUqr+rXgr0WzIpKvPtTtSXFEruqXhcrNqwL9qfRhZg d2UQ3rfdmJWB3L2nfj6SVPqAVmkvXFTQf/qoB1ggAFzxP1iwLY5HD2uexlQJHgGe/EJV ioDQ== X-Gm-Message-State: AOAM5303jcvN0jsCzfcxtZG23sNOd8TmUQljGyTYa0qDPVd9M6AWKyJF BYI/jsKMD+awBT6KPJqPGn5Nnddjvp8zAXVxPraXL1B5+o+I X-Google-Smtp-Source: ABdhPJxz4SQu4A4rdaQz1JJUS90biGgjK7Mm9sZZE4NzvdVqRmeRD40WWpsBvRjHG3bQJOxi3NZRYHnot5kBb62meeUF8lLcp2uq MIME-Version: 1.0 X-Received: by 2002:a05:6e02:42:: with SMTP id i2mr2552973ilr.184.1597290323164; Wed, 12 Aug 2020 20:45:23 -0700 (PDT) Date: Wed, 12 Aug 2020 20:45:23 -0700 In-Reply-To: <000000000000ece9db05ac4054e8@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000050c61e05acba22b6@google.com> Subject: Re: WARNING in compat_do_ebt_get_ctl From: syzbot To: bridge@lists.linux-foundation.org, coreteam@netfilter.org, davem@davemloft.net, fw@strlen.de, kadlec@netfilter.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, netfilter-devel@vger.kernel.org, nikolay@cumulusnetworks.com, pablo@netfilter.org, roopa@cumulusnetworks.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org syzbot has found a reproducer for the following issue on: HEAD commit: fb893de3 Merge tag 'tag-chrome-platform-for-v5.9' of git:/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1742b31c900000 kernel config: https://syzkaller.appspot.com/x/.config?x=f1fedc63022bf07e dashboard link: https://syzkaller.appspot.com/bug?extid=5accb5c62faa1d346480 compiler: gcc (GCC) 10.1.0-syz 20200507 userspace arch: i386 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13280fd6900000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1409f4a6900000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5accb5c62faa1d346480@syzkaller.appspotmail.com ------------[ cut here ]------------ Buffer overflow detected (80 < 137)! WARNING: CPU: 0 PID: 6853 at include/linux/thread_info.h:134 copy_overflow include/linux/thread_info.h:134 [inline] WARNING: CPU: 0 PID: 6853 at include/linux/thread_info.h:134 check_copy_size include/linux/thread_info.h:143 [inline] WARNING: CPU: 0 PID: 6853 at include/linux/thread_info.h:134 copy_to_user include/linux/uaccess.h:151 [inline] WARNING: CPU: 0 PID: 6853 at include/linux/thread_info.h:134 compat_do_ebt_get_ctl+0x47e/0x500 net/bridge/netfilter/ebtables.c:2270 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 6853 Comm: syz-executor171 Not tainted 5.8.0-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+0x18f/0x20d lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:231 __warn.cold+0x20/0x45 kernel/panic.c:600 report_bug+0x1bd/0x210 lib/bug.c:198 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:234 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:254 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536 RIP: 0010:copy_overflow include/linux/thread_info.h:134 [inline] RIP: 0010:check_copy_size include/linux/thread_info.h:143 [inline] RIP: 0010:copy_to_user include/linux/uaccess.h:151 [inline] RIP: 0010:compat_do_ebt_get_ctl+0x47e/0x500 net/bridge/netfilter/ebtables.c:2270 Code: ba fd ff ff 4c 89 f7 e8 60 07 a2 fa e9 ad fd ff ff e8 36 18 62 fa 4c 89 e2 be 50 00 00 00 48 c7 c7 40 b9 0e 89 e8 94 1f 33 fa <0f> 0b e9 dc fd ff ff 41 bc f2 ff ff ff e9 4f fe ff ff e8 3b 07 a2 RSP: 0018:ffffc90005667ae8 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 1ffff92000accf5e RCX: 0000000000000000 RDX: ffff88809458a280 RSI: ffffffff815dbce7 RDI: fffff52000accf4f RBP: ffffffff8a8faa60 R08: 0000000000000001 R09: ffff8880ae6318e7 R10: 0000000000000000 R11: 0000000035383654 R12: 0000000000000089 R13: 0000000020000000 R14: ffffc90005667d80 R15: ffffc90005667b20 do_ebt_get_ctl+0x2b4/0x790 net/bridge/netfilter/ebtables.c:2317 nf_getsockopt+0x72/0xd0 net/netfilter/nf_sockopt.c:116 ip_getsockopt net/ipv4/ip_sockglue.c:1778 [inline] ip_getsockopt+0x164/0x1c0 net/ipv4/ip_sockglue.c:1757 tcp_getsockopt+0x86/0xd0 net/ipv4/tcp.c:3884 __sys_getsockopt+0x219/0x4c0 net/socket.c:2179 __do_sys_getsockopt net/socket.c:2194 [inline] __se_sys_getsockopt net/socket.c:2191 [inline] __ia32_sys_getsockopt+0xb9/0x150 net/socket.c:2191 do_syscall_32_irqs_on arch/x86/entry/common.c:84 [inline] __do_fast_syscall_32+0x57/0x80 arch/x86/entry/common.c:126 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:149 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f91569 Code: 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000ffdae08c EFLAGS: 00000292 ORIG_RAX: 000000000000016d RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000000 RDX: 0000000000000082 RSI: 0000000020000000 RDI: 0000000020000100 RBP: 0000000000000012 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Kernel Offset: disabled Rebooting in 86400 seconds..