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

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Message-ID: <20180731134014.GA32114@bistromath.localdomain>
Date:   Tue, 31 Jul 2018 15:40:14 +0200
From:   Sabrina Dubroca <sd@...asysnail.net>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     syzbot <syzbot+41f9c04b50ef70c66947@...kaller.appspotmail.com>,
        christian.brauner@...ntu.com, davem@...emloft.net,
        dsahern@...il.com, fw@...len.de, jbenc@...hat.com,
        ktkhai@...tuozzo.com, linux-kernel@...r.kernel.org,
        lucien.xin@...il.com, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Read in rtnetlink_put_metrics

2018-07-31, 05:41:56 -0700, Eric Dumazet wrote:
> 
> 
> On 07/31/2018 05:31 AM, syzbot wrote:
> > Hello,
> > 
> > syzbot found the following crash on:
> > 
> > HEAD commit:    61f4b23769f0 netlink: Don't shift with UB on nlk->ngroups
> > git tree:       net
> > console output: https://syzkaller.appspot.com/x/log.txt?x=14a9de58400000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=ffb4428fdc82f93b
> > dashboard link: https://syzkaller.appspot.com/bug?extid=41f9c04b50ef70c66947
> > compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
> > 
> > Unfortunately, I don't have any reproducer for this crash yet.
[...]

> Probably also caused by :
> 
> 
> commit df18b50448fab1dff093731dfd0e25e77e1afcd1
> Author: Sabrina Dubroca <sd@...asysnail.net>
> Date:   Mon Jul 30 16:23:10 2018 +0200
> 
>     net/ipv6: fix metrics leak

Yeah, I'm looking into both those reports :/

-- 
Sabrina