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Date:   Thu, 9 Nov 2017 22:38:57 +1100
From:   Herbert Xu <>
To:     Dmitry Vyukov <>
Cc:     syzbot 
        David Miller <>,
        LKML <>,
        netdev <>,
        Steffen Klassert <>,
Subject: Re: kernel BUG at net/key/af_key.c:LINE!

On Wed, Nov 08, 2017 at 08:59:15AM +0100, Dmitry Vyukov wrote:
> Also the repro needs to be compiled with -m32 (but it does not compile
> without it due to missing __NR_mmap2, so I guess you passed -m32).

OK that's what I was missing.  I had hacked it to compile in
64-bit :)

However, I still don't understand why it's crashing yet.  What is
clear is that we're getting a socket policy with xp->family set
to zero, and the policy is created via the xfrm code path (as
opposed to af_key).

The xfrm code path is meant to forbid the creation of such a policy.
I don't currently see how this is bypassing that check.  But
clearly it has found a way through the check since it's crashing.

Email: Herbert Xu <>
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