netdev - Re: [PATCH v2] ipv4: netfilter: ipt_CLUSTERIP: fix buffer overflow

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Message-ID: <AANLkTimtsB0B98E2xcoJgRsPwSpwuG+ahT+LX0s1YwpX@mail.gmail.com>
Date:	Thu, 17 Mar 2011 20:15:06 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Vasiliy Kulikov <segoon@...nwall.com>
Cc:	Patrick McHardy <kaber@...sh.net>, linux-kernel@...r.kernel.org,
	security@...nel.org, "David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	netfilter-devel@...r.kernel.org, netfilter@...r.kernel.org,
	coreteam@...filter.org, netdev@...r.kernel.org
Subject: Re: [PATCH v2] ipv4: netfilter: ipt_CLUSTERIP: fix buffer overflow

On Thu, Mar 17, 2011 at 7:32 PM, Vasiliy Kulikov <segoon@...nwall.com> wrote:
> 'buffer' string is copied from userspace.  It is not checked whether it is
> zero terminated.  This may lead to overflow inside of simple_strtoul().
> Changli Gao suggested to copy not more than user supplied 'size' bytes.
>
> It was introduced before the git epoch.  Files "ipt_CLUSTERIP/*" are
> root writable only by default, however, on some setups permissions might be
> relaxed to e.g. network admin user.
>
> Signed-off-by: Vasiliy Kulikov <segoon@...nwall.com>
Acked-by: Changli Gao <xiaosuo@...il.com>


-- 
Regards,
Changli Gao(xiaosuo@...il.com)
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