linux-kernel - Re: KASAN: use-after-free Read in tick_sched

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Message-ID: <20191108135105.674043a5@elisabeth>
Date:   Fri, 8 Nov 2019 13:51:05 +0100
From:   Stefano Brivio <sbrivio@...hat.com>
To:     syzbot <syzbot+999bca54de2ee169c021@...kaller.appspotmail.com>
Cc:     davem@...emloft.net, dvyukov@...gle.com, frederic@...nel.org,
        fweisbec@...il.com, kuznet@....inr.ac.ru,
        linux-kernel@...r.kernel.org, mingo@...nel.org,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de, yoshfuji@...ux-ipv6.org
Subject: Re: KASAN: use-after-free Read in tick_sched_handle (3)

On Thu, 07 Nov 2019 05:42:07 -0800
syzbot <syzbot+999bca54de2ee169c021@...kaller.appspotmail.com> wrote:

> syzbot suspects this bug was fixed by commit:
> 
> commit bc6e019b6ee65ff4ebf3ca272f774cf6c67db669
> Author: Stefano Brivio <sbrivio@...hat.com>
> Date:   Thu Jan 3 20:43:34 2019 +0000
> 
>      fou: Prevent unbounded recursion in GUE error handler also with UDP-Lite
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=119c0bc2600000
> start commit:   1c7fc5cb Linux 5.0-rc2
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=817708c0a0300f84
> dashboard link: https://syzkaller.appspot.com/bug?extid=999bca54de2ee169c021
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12c95a30c00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11df0107400000
> 
> If the result looks correct, please mark the bug fixed by replying with:
> 
> #syz fix: fou: Prevent unbounded recursion in GUE error handler also with  
> UDP-Lite
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

#syz fix: fou: Prevent unbounded recursion in GUE error handler also with UDP-Lite