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

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Message-ID: <20130604010327.GA23054@verge.net.au>
Date:	Tue, 4 Jun 2013 10:03:27 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Dan Carpenter <dan.carpenter@...cle.com>
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 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?

> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> 
> diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
> index df05c1c..e336535 100644
> --- a/net/netfilter/ipvs/ip_vs_ctl.c
> +++ b/net/netfilter/ipvs/ip_vs_ctl.c
> @@ -2542,6 +2542,7 @@ __ip_vs_get_dest_entries(struct net *net, const struct ip_vs_get_dests *get,
>  		struct ip_vs_dest *dest;
>  		struct ip_vs_dest_entry entry;
>  
> +		memset(&entry, 0, sizeof(entry));
>  		list_for_each_entry(dest, &svc->destinations, n_list) {
>  			if (count >= get->num_dests)
>  				break;
> --
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