netdev - Re: [PATCH 1/3] netfilter: Fix copy_to

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Message-ID: <20120301131356.GS1003@mwanda>
Date:	Thu, 1 Mar 2012 16:13:56 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Pablo Neira Ayuso <pablo@...filter.org>
Cc:	santosh nayak <santoshprasadnayak@...il.com>,
	bart.de.schuymer@...dora.be, kaber@...sh.net,
	shemminger@...tta.com, davem@...emloft.net,
	netfilter-devel@...r.kernel.org, netfilter@...r.kernel.org,
	coreteam@...filter.org, bridge@...ts.linux-foundation.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 1/3] netfilter: Fix copy_to_user too small size parametre.

On Thu, Mar 01, 2012 at 02:06:37PM +0100, Pablo Neira Ayuso wrote:
> > Where do we clear "m"? 
> > 
> > include/linux/netfilter/x_tables.h
> >    287  struct xt_match {
> >    288          struct list_head list;
> >    289  
> >    290          const char name[XT_EXTENSION_MAXNAMELEN];
> >    291          u_int8_t revision;
> >    292  
> > 
> > There is a 2 byte holes here between "revision" and "match()".  We
> > copy three bytes past the end of name, so we include revision and
> > the hole.
> > 
> > But maybe we memset it somewhere?  I'm not sure.
> 
> xt_match instances are declared as static for each module so it's
> allocated in the BSS (already zeroed), is that what you mean?
> 

Yeah.  I didn't know how that worked.  Thanks.

regards,
dan carpenter


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