linux-kernel - Re: [PATCH] IPVS: replace sprintf to snprintf to avoid stack buffer overflow

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Message-ID: <k2l412e6f7f1004051958h7c50f439r6b7a84379c35cba5@mail.gmail.com>
Date:	Tue, 6 Apr 2010 10:58:28 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	wzt.wzt@...il.com
Cc:	linux-kernel@...r.kernel.org, wensong@...ux-vs.org,
	netdev@...r.kernel.org, lvs-devel@...r.kernel.org
Subject: Re: [PATCH] IPVS: replace sprintf to snprintf to avoid stack buffer 
	overflow

On Tue, Apr 6, 2010 at 10:50 AM,  <wzt.wzt@...il.com> wrote:
> IPVS not check the length of pp->name, use sprintf will cause stack buffer overflow.
> struct ip_vs_protocol{} declare name as char *, if register a protocol as:
> struct ip_vs_protocol ip_vs_test = {
>        .name =                 "aaaaaaaa....128...aaa",
>        .debug_packet =         ip_vs_tcpudp_debug_packet,
> };
>
> when called ip_vs_tcpudp_debug_packet(), sprintf(buf, "%s TRUNCATED", pp->name);
> will cause stack buffer overflow.
>

Long messages will be truncated instead of buffer overflow. We need to
find a way to handle long messages elegantly.

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