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

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Message-ID: <1365781107.15783.98.camel@zakaz.uk.xensource.com>
Date:	Fri, 12 Apr 2013 16:38:27 +0100
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Wei Liu <wei.liu2@...rix.com>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>,
	"annie.li@...cle.com" <annie.li@...cle.com>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	"jbeulich@...e.com" <jbeulich@...e.com>,
	"wdauchy@...il.com" <wdauchy@...il.com>,
	David Vrabel <david.vrabel@...rix.com>
Subject: Re: [PATCH V4 7/7] xen-netback: don't disconnect frontend when
 seeing oversize packet

On Fri, 2013-04-12 at 15:24 +0100, Wei Liu 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>

Acked-by: Ian Campbell <ian.campbell@...rix.com>


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