netdev - Re: [PATCHv2 net] vhost: fix total length when packets are too short

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Date:	Fri, 28 Mar 2014 16:09:40 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	mst@...hat.com
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	virtio-dev@...ts.oasis-open.org,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
	jasowang@...hat.com
Subject: Re: [PATCHv2 net] vhost: fix total length when packets are too
 short

From: "Michael S. Tsirkin" <mst@...hat.com>
Date: Thu, 27 Mar 2014 12:00:26 +0200

> When mergeable buffers are disabled, and the
> incoming packet is too large for the rx buffer,
> get_rx_bufs returns success.
> 
> This was intentional in order for make recvmsg
> truncate the packet and then handle_rx would
> detect err != sock_len and drop it.
> 
> Unfortunately we pass the original sock_len to
> recvmsg - which means we use parts of iov not fully
> validated.
> 
> Fix this up by detecting this overrun and doing packet drop
> immediately.
> 
> CVE-2014-0077
> 
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
> 
> Changes from v1:
> 	Fix CVE# in the commit log.
> 	Patch is unchanged.
> 
> Note: this is needed for -stable.

Applied and queued up for -stable.

> I wonder if this can still make the release.

I will try but no promises.
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