linux-kernel - Re: [PATCH 3/5] net/netfilter/ipvs/ip_vs_ctl.c: drop argument range check just before the check for equality

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Date:	Tue, 22 Jul 2014 12:14:41 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Julian Anastasov <ja@....bg>
Cc:	Andrey Utkin <andrey.krieger.utkin@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org, coreteam@...filter.org,
	netfilter-devel@...r.kernel.org, lvs-devel@...r.kernel.org,
	netdev@...r.kernel.org, dcb314@...mail.com,
	David Miller <davem@...emloft.net>, kadlec@...ckhole.kfki.hu,
	Patrick McHardy <kaber@...sh.net>, pablo@...filter.org,
	Simon Horman <horms@...ge.net.au>, wensong@...ux-vs.org
Subject: Re: [PATCH 3/5] net/netfilter/ipvs/ip_vs_ctl.c: drop argument range
 check just before the check for equality

On Tue, Jul 22, 2014 at 11:52:02AM +0300, Julian Anastasov wrote:
> > > -	if (copylen > 128)
> > > +	if (*len < (int) copylen || *len < 0) {
> > > +		pr_err("get_ctl: len %d < %u\n", *len, copylen);
> > 
> > Don't let users flood dmesg.  Just return an error.  (This can be
> > triggered by non-root as well).
> 
> 	For now both set and get are privileged operations,
> so we can keep it, it can catch if something wrong happens
> with the structure sizes.

If you have namespaces enabled then it's not *that* privaleged.

regards,
dan carpenter

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