linux-kernel - Re: KASAN: use-after-free Write in __xfrm_policy

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Message-ID: <CACT4Y+ZyOxkQgHm-8sgv+ORpFYTZ4gH9gqnYCZBL0-v4SJ1Asw@mail.gmail.com>
Date:   Thu, 27 Dec 2018 11:17:10 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Florian Westphal <fw@...len.de>
Cc:     syzbot <syzbot+9d971dd21eb26567036b@...kaller.appspotmail.com>,
        David Miller <davem@...emloft.net>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: KASAN: use-after-free Write in __xfrm_policy_unlink

On Wed, Dec 26, 2018 at 11:42 AM Florian Westphal <fw@...len.de> wrote:
>
> syzbot <syzbot+9d971dd21eb26567036b@...kaller.appspotmail.com> wrote:
> > syzbot has found a reproducer for the following crash on:
> >
> > HEAD commit:    ce28bb445388 Merge git://git.kernel.org/pub/scm/linux/kern..
> > git tree:       net-next
> > console output: https://syzkaller.appspot.com/x/log.txt?x=1673fb1b400000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=67a2081147a23142
> > dashboard link: https://syzkaller.appspot.com/bug?extid=9d971dd21eb26567036b
> > compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1134dcc7400000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=126986ed400000
> >
> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > Reported-by: syzbot+9d971dd21eb26567036b@...kaller.appspotmail.com
>
> I've fixed this one.  Chances are that at least some of the other
> reports are duplicates of this one.
>
> I will continue to look at other reports over the next few days and plan
> to send out fixes and test cases next week.

Thanks for the update, Florian. Sounds great, let's kill them all!