netdev - Re: [syzbot] upstream boot error: WARNING in netlink

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Message-ID: <F58E0701-8F53-46FE-8324-4DEA7A806C20@chromium.org>
Date:   Tue, 04 Oct 2022 07:36:55 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Dmitry Vyukov <dvyukov@...gle.com>,
        syzbot <syzbot+3a080099974c271cd7e9@...kaller.appspotmail.com>
CC:     bpf@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
        fw@...len.de, harshit.m.mogalapalli@...cle.com, kuba@...nel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        pabeni@...hat.com, syzkaller-bugs@...glegroups.com,
        linux-hardening@...r.kernel.org
Subject: Re: [syzbot] upstream boot error: WARNING in netlink_ack



On October 4, 2022 1:33:30 AM PDT, Dmitry Vyukov <dvyukov@...gle.com> wrote:
>On Tue, 4 Oct 2022 at 10:27, syzbot
><syzbot+3a080099974c271cd7e9@...kaller.appspotmail.com> wrote:
>>
>> Hello,
>>
>> syzbot found the following issue on:
>>
>> HEAD commit:    725737e7c21d Merge tag 'statx-dioalign-for-linus' of git:/..
>> git tree:       upstream
>> console output: https://syzkaller.appspot.com/x/log.txt?x=10257034880000
>> kernel config:  https://syzkaller.appspot.com/x/.config?x=486af5e221f55835
>> dashboard link: https://syzkaller.appspot.com/bug?extid=3a080099974c271cd7e9
>> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
>>
>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> Reported-by: syzbot+3a080099974c271cd7e9@...kaller.appspotmail.com
>
>+linux-hardening
>
>> ------------[ cut here ]------------
>> memcpy: detected field-spanning write (size 28) of single field "&errmsg->msg" at net/netlink/af_netlink.c:2447 (size 16)

This is fixed in the pending netdev tree coming for the merge window.

-- 
Kees Cook