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

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Message-ID: <20130317185022.GA22517@redhat.com>
Date:	Sun, 17 Mar 2013 20:50:22 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	David Miller <davem@...emloft.net>
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

On Sun, Mar 17, 2013 at 02:29:55PM -0400, David Miller wrote:
> 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.

OK I'll drop it from my tree then.
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