netdev - Re: [patch] ipvs: info leak in __ip_vs_get_dest

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Message-ID: <20130607083314.GQ23987@mwanda>
Date:	Fri, 7 Jun 2013 11:33:14 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Simon Horman <horms@...ge.net.au>
Cc:	Wensong Zhang <wensong@...ux-vs.org>, Julian Anastasov <ja@....bg>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Patrick McHardy <kaber@...sh.net>,
	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	lvs-devel@...r.kernel.org, netfilter-devel@...r.kernel.org,
	netfilter@...r.kernel.org, coreteam@...filter.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [patch] ipvs: info leak in __ip_vs_get_dest_entries()

On Mon, Jun 03, 2013 at 06:03:27PM -0700, Simon Horman wrote:
> On Mon, Jun 03, 2013 at 12:00:49PM +0300, Dan Carpenter wrote:
> > The entry struct has a 2 byte hole after ->port and another 4 byte
> > hole after ->stats.outpkts.  You must have CAP_NET_ADMIN in your
> > namespace to hit this information leak.
> 
> Hi Dan,
> 
> can I verify that it is actually possible to hit this and
> thus the patch is a -stable candidate?

This is a static checker fix.  To me it seems like it's obviously a
real info leak.

I'm not certain of the impact though.  CLONE_NEWNET requires
CAP_SYS_ADMIN but on the other hand people are making virtualization
products where they give everyone their own namespace with admin
privileges.

regards,
dan carpenter
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