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

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Message-ID: <20100406032248.GF30359@verge.net.au>
Date:	Tue, 6 Apr 2010 13:22:49 +1000
From:	Simon Horman <horms@...ge.net.au>
To:	wzt.wzt@...il.com
Cc:	linux-kernel@...r.kernel.org, Wensong Zhang <wensong@...ux-vs.org>,
	Julian Anastasov <ja@....bg>, netdev@...r.kernel.org,
	lvs-devel@...r.kernel.org, Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH] IPVS: replace sprintf to snprintf to avoid stack
 buffer overflow

On Tue, Apr 06, 2010 at 10:50:20AM +0800, 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.
>
> Signed-off-by: Zhitong Wang <zhitong.wangzt@...baba-inc.com>

I think that the simple answer is, don't do that.
But your patch seems entirely reasonable to me.

Acked-by: Simon Horman <horms@...ge.net.au>

Patrick, please consider merging this.

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