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

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Date:   Tue, 12 Dec 2017 13:00:31 -0800
From:   Eric Biggers <ebiggers3@...il.com>
To:     Steffen Klassert <steffen.klassert@...unet.com>
Cc:     syzbot 
        <bot+68bf59b49142965d6454163d7341e617a90139dc@...kaller.appspotmail.com>,
        davem@...emloft.net, herbert@...dor.apana.org.au,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: stack-out-of-bounds Read in xfrm_state_find (3)

Hi Steffen,

On Fri, Dec 01, 2017 at 08:27:43AM +0100, Steffen Klassert wrote:
> On Wed, Nov 22, 2017 at 08:05:00AM -0800, syzbot wrote:
> > syzkaller has found reproducer for the following crash on
> > 0c86a6bd85ff0629cd2c5141027fc1c8bb6cde9c
> > git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/master
> > compiler: gcc (GCC) 7.1.1 20170620
> > .config is attached
> > Raw console output is attached.
> > C reproducer is attached
> > syzkaller reproducer is attached. See https://goo.gl/kgGztJ
> > for information about syzkaller reproducers
> > 
> > 
> > BUG: KASAN: stack-out-of-bounds in xfrm_state_find+0x30fc/0x3230
> > net/xfrm/xfrm_state.c:1051
> > Read of size 4 at addr ffff8801ccaa7af8 by task syzkaller231684/3045
> 
> The patch below should fix this. I plan to apply it to the ipsec tree
> after some advanced testing.
> 
> Subject: [PATCH RFC] xfrm: Fix stack-out-of-bounds with misconfigured transport
>  mode policies.
> 

Are you still planning to apply this?  syzbot is still hitting this bug.

Eric