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

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Message-ID: <20171213051805.7z74wh7sglaflo4j@gauss3.secunet.de>
Date:   Wed, 13 Dec 2017 06:18:05 +0100
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Eric Biggers <ebiggers3@...il.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)

On Tue, Dec 12, 2017 at 01:00:31PM -0800, Eric Biggers wrote:
> 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.

It is already applied to the ipsec tree, will go upstream by the end of
this week.