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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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)
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/