linux-kernel - Re: KASAN: slab-out-of-bounds Read in tick_sched

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Date:   Sat, 16 Mar 2019 16:52:41 +0100
From:   Stefano Brivio <sbrivio@...hat.com>
To:     syzbot <syzbot+09d51a30df9fe76edb2a@...kaller.appspotmail.com>
Cc:     davem@...emloft.net, fweisbec@...il.com, kuznet@....inr.ac.ru,
        linux-kernel@...r.kernel.org, mingo@...nel.org,
        netdev@...r.kernel.org, sd@...asysnail.net,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de,
        yoshfuji@...ux-ipv6.org, Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: KASAN: slab-out-of-bounds Read in tick_sched_handle

On Sat, 16 Mar 2019 07:49:01 -0700
syzbot <syzbot+09d51a30df9fe76edb2a@...kaller.appspotmail.com> wrote:

> syzbot has bisected this bug to:
> 
> commit b8a51b38e4d4dec3e379d52c0fe1a66827f7cf1e
> Author: Stefano Brivio <sbrivio@...hat.com>
> Date:   Thu Nov 8 11:19:23 2018 +0000
> 
>      fou, fou6: ICMP error handlers for FoU and GUE
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=16f943e7200000
> start commit:   b8a51b38 fou, fou6: ICMP error handlers for FoU and GUE
> git tree:       upstream
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=15f943e7200000
> console output: https://syzkaller.appspot.com/x/log.txt?x=11f943e7200000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=b05cfdb4ee8ab9b2
> dashboard link: https://syzkaller.appspot.com/bug?extid=09d51a30df9fe76edb2a
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17359fab400000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=154a2a37400000
> 
> Reported-by: syzbot+09d51a30df9fe76edb2a@...kaller.appspotmail.com
> Fixes: b8a51b38 ("fou, fou6: ICMP error handlers for FoU and GUE")

Might be fixed by bc6e019b6ee6 ("fou: Prevent unbounded recursion in GUE
error handler also with UDP-Lite"), testing/checking now.

-- 
Stefano