netdev - Re: [PATCH net] vhost/net: fix heads usage of ubuf

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Date:	Sun, 17 Mar 2013 14:29:55 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	mst@...hat.com
Cc:	stable@...nel.org, rusty@...tcorp.com.au, jasowang@...hat.com,
	basil.gor@...il.com, nab@...ingtidesystems.com,
	kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] vhost/net: fix heads usage of ubuf_info

From: "Michael S. Tsirkin" <mst@...hat.com>
Date: Sun, 17 Mar 2013 14:46:09 +0200

> ubuf info allocator uses guest controlled head as an index,
> so a malicious guest could put the same head entry in the ring twice,
> and we will get two callbacks on the same value.
> To fix use upend_idx which is guaranteed to be unique.
> 
> Reported-by: Rusty Russell <rusty@...tcorp.com.au>
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>

Applied and queued up for -stable, thanks.

And thankfully you got the stable URL wrong, please do not CC:
networking patches to stable, just make sure I apply them and in
your post-commit text explicitly ask me to queue it up to my
-stable queue.

Thanks.

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