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

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Message-ID: <20171103121012.GA23855@secunet.com>
Date:   Fri, 3 Nov 2017 13:10:12 +0100
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Florian Westphal <fw@...len.de>
CC:     syzbot 
        <bot+19b21aa652248382e2b8cbb81fa1cdc03b4bda01@...kaller.appspotmail.com>,
        <davem@...emloft.net>, <herbert@...dor.apana.org.au>,
        <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <syzkaller-bugs@...glegroups.com>, <thomas.egerer@...unet.com>
Subject: Re: KASAN: stack-out-of-bounds Read in xfrm_state_find (2)

On Thu, Nov 02, 2017 at 01:25:28PM +0100, Florian Westphal wrote:
> Steffen Klassert <steffen.klassert@...unet.com> wrote:
> 
> > I'd propose to use the addresses from the template unconditionally,
> > like the (untested) patch below does.
> > 
> > Unfortunalely the reproducer does not work with my config,
> > sendto returns EAGAIN. Could anybody try this patch?
> 
> The reproducer no longer causes KASAN spew with your patch,
> but i don't have a test case that actually creates/uses a tunnel.

The patch passed my standard tests, so I tend apply it
after a day in the ipsec/testing branch.