netdev - Re: [PATCH V4 7/7] xen-netback: don't disconnect frontend when seeing oversize packet

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Date:	Mon, 15 Apr 2013 16:24:49 +0100
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Wei Liu <wei.liu2@...rix.com>
CC:	William Dauchy <wdauchy@...il.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	xen-devel <xen-devel@...ts.xen.org>,
	"annie.li@...cle.com" <annie.li@...cle.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"jbeulich@...e.com" <jbeulich@...e.com>,
	David Vrabel <david.vrabel@...rix.com>
Subject: Re: [PATCH V4 7/7] xen-netback: don't disconnect frontend when
 seeing oversize packet

On Mon, 2013-04-15 at 15:53 +0100, Wei Liu wrote:
> On Mon, Apr 15, 2013 at 10:03:25AM +0100, Ian Campbell wrote:
> > On Fri, 2013-04-12 at 18:17 +0100, William Dauchy wrote:
> > > On Fri, Apr 12, 2013 at 4:24 PM, Wei Liu <wei.liu2@...rix.com> wrote:
> > > > Some frontend drivers are sending packets > 64 KiB in length. This length
> > > > overflows the length field in the first slot making the following slots have
> > > > an invalid length.
> > > >
> > > > Turn this error back into a non-fatal error by dropping the packet. To avoid
> > > > having the following slots having fatal errors, consume all slots in the
> > > > packet.
> > > >
> > > > This does not reopen the security hole in XSA-39 as if the packet as an
> > > > invalid number of slots it will still hit fatal error case.
> > > >
> > > > Signed-off-by: David Vrabel <david.vrabel@...rix.com>
> > > > Signed-off-by: Wei Liu <wei.liu2@...rix.com>
> > > 
> > > Maybe this should be tagged for stable? Maybe part of patch 6/7 as
> > > well. I had to remove the part which was disabling the device because
> > > of issues encountered in stable tree.
> > 
> > AFAICT the majority of this series (as well as perhaps some of Wei's
> > earlier fixes) should be candidates for any stable tree which received
> > the XSA-39 security fixes. Wei -- could you enumerate which patches are
> > required to fixup the XSA-39 regressions?
> > 
> 
> Are mechinical fixes such as removing redudent variables / changing log
> messages candidates for stable? 1-4 are such kind of fixes.

#4 looks like meat to me too?

My personal opinion is that it is better where possible to take
relatively simple and/or obvious precursors (renaming and such fit this
IMHO) than to risk making a mistake in the backport.

> 5-7 are the real meat. If 1-4 are not taken to stable, they will need
> small adjustment to apply, which is just trivial.
> 
> 
> Wei.
> 
> > Ian.
> > 


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