linux-kernel - Re: KASAN: stack-out-of-bounds Read in timerqueue

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Date:   Wed, 4 Jul 2018 09:59:25 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>,
        John Fastabend <john.fastabend@...il.com>
Cc:     syzbot <syzbot+b680e42077a0d7c9a0c4@...kaller.appspotmail.com>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        netdev <netdev@...r.kernel.org>
Subject: Re: KASAN: stack-out-of-bounds Read in timerqueue_add

On Wed, Jul 4, 2018 at 9:34 AM, Dmitry Vyukov <dvyukov@...gle.com> wrote:
> On Wed, Jul 4, 2018 at 6:29 PM, syzbot
> <syzbot+b680e42077a0d7c9a0c4@...kaller.appspotmail.com> wrote:
>> Hello,
>>
>> syzbot found the following crash on:
>>
>> HEAD commit:    fc36def997cf mm: teach dump_page() to correctly output poi..
>> git tree:       upstream
>> console output: https://syzkaller.appspot.com/x/log.txt?x=167e3b92400000
>> kernel config:  https://syzkaller.appspot.com/x/.config?x=f62553dc846b0692
>> dashboard link: https://syzkaller.appspot.com/bug?extid=b680e42077a0d7c9a0c4
>> compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
>> syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=1030a858400000
>> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1167aaa4400000
>>
>> IMPORTANT: if you fix the bug, please add the following tag to the commit:
>> Reported-by: syzbot+b680e42077a0d7c9a0c4@...kaller.appspotmail.com
>
> +bpf maintainers since the repro seems to deal to bpf maps
>
> We've got a splash of crashes today, all seem to suggest some kind of
> stack corruption/overflow, see the last 6 bugs here:
> https://syzkaller.appspot.com/

John, this is sockhash map related. Please take a look asap.