linux-kernel - Re: kernel BUG at net/key/af

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Date:   Sun, 3 Dec 2017 12:28:20 -0800
From:   Eric Biggers <ebiggers3@...il.com>
To:     Steffen Klassert <steffen.klassert@...unet.com>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        syzbot 
        <bot+413384116f7f7dab7903d54c53fc4af6a4441965@...kaller.appspotmail.com>,
        David Miller <davem@...emloft.net>,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>, syzkaller-bugs@...glegroups.com
Subject: Re: kernel BUG at net/key/af_key.c:LINE!

On Wed, Nov 15, 2017 at 12:29:19PM +0100, Steffen Klassert wrote:
> On Fri, Nov 10, 2017 at 02:14:06PM +1100, Herbert Xu wrote:
> > On Fri, Nov 10, 2017 at 01:30:38PM +1100, Herbert Xu wrote:
> > > 
> > > I found the problem.  This crap is coming from clone_policy.  Now
> > > let me where this code came from.
> > 
> > ---8<---
> > Subject: xfrm: Copy policy family in clone_policy
> > 
> > The syzbot found an ancient bug in the IPsec code.  When we cloned
> > a socket policy (for example, for a child TCP socket derived from a
> > listening socket), we did not copy the family field.  This results
> > in a live policy with a zero family field.  This triggers a BUG_ON
> > check in the af_key code when the cloned policy is retrieved.
> > 
> > This patch fixes it by copying the family field over.
> > 
> > Reported-by: syzbot <syzkaller@...glegroups.com>
> > Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
> 
> Patch applied, thanks Herbert!

And to tell the bot what fixes this:

#syz fix: xfrm: Copy policy family in clone_policy

Also, does this fix need to go to stable?  The commit doesn't have Cc: stable.