From: Herbert Xu <herbert@gondor.apana.org.au>
To: Greg Hackmann <ghackmann@google.com>
Cc: Steffen Klassert <steffen.klassert@secunet.com>,
"David S. Miller" <davem@davemloft.net>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
stable@vger.kernel.org
Subject: Re: [PATCH] net: xfrm: use preempt-safe this_cpu_read() in ipcomp_alloc_tfms()
Date: Thu, 8 Mar 2018 15:33:28 +0800 [thread overview]
Message-ID: <20180308073328.GA8111@gondor.apana.org.au> (raw)
In-Reply-To: <20180307192416.233202-1-ghackmann@google.com>
On Wed, Mar 07, 2018 at 11:24:16AM -0800, Greg Hackmann wrote:
> f7c83bcbfaf5 ("net: xfrm: use __this_cpu_read per-cpu helper") added a
> __this_cpu_read() call inside ipcomp_alloc_tfms(). Since this call was
> introduced, the rules around per-cpu accessors have been tightened and
> __this_cpu_read() cannot be used in a preemptible context.
>
> syzkaller reported this leading to the following kernel BUG while
> fuzzing sendmsg:
How about reverting f7c83bcbfaf5 instead?
Thanks,
--
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
next prev parent reply other threads:[~2018-03-08 7:33 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-07 19:24 [PATCH] net: xfrm: use preempt-safe this_cpu_read() in ipcomp_alloc_tfms() Greg Hackmann
2018-03-07 20:21 ` Eric Dumazet
2018-03-07 20:50 ` Greg Hackmann
2018-03-08 7:33 ` Herbert Xu [this message]
2018-03-08 16:31 ` Eric Dumazet
2018-03-08 18:40 ` Herbert Xu
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