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

[Changli Gao <xiaosuo@xxxxxxxxx>]

On Tue, Apr 6, 2010 at 10:50 AM,  <wzt.wzt@xxxxxxxxx> 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@xxxxxxxxx)
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