netdev - Re: [PATCH v2] ipv4: netfilter: always let NUL terminated string ended by '\0'

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Message-ID: <519EBE2C.1010005@asianux.com>
Date:	Fri, 24 May 2013 09:11:08 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Pablo Neira Ayuso <pablo@...filter.org>
CC:	kaber@...sh.net, kuznet@....inr.ac.ru, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, David Miller <davem@...emloft.net>,
	netfilter-devel@...r.kernel.org, netfilter@...r.kernel.org,
	coreteam@...filter.org, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH v2] ipv4: netfilter: always let NUL terminated string
 ended by '\0'

On 05/23/2013 08:26 PM, Pablo Neira Ayuso wrote:
> On Thu, May 23, 2013 at 07:50:46PM +0800, Chen Gang wrote:
>> > 
>> > For NUL terminated string, need always be sure of ended by '\0'.
>> > 
>> > 'prefix' max length is 128 (NF_LOG_PREFIXLEN), and 'pm->prefix' max
>> > length is 32 (ULOG_PREFIX_LEN), so really need notice it.
>> > 
>> > 'pm' is 'struct ulog_packet_msg_t' which may be copied to user mode
>> > (defined in "include/uapi/..."), so can not use strlcpy() instead of.
> That's fixing a real bug. We're passing strings that are longer than
> 32 bytes from nf_conntrack_tcp via nf_log, if ipt_ULOG is used, it
> will pass a non-null terminated string.
> 
> I'm going to rework the patch description to include this and apply
> this patch.
> 
> Thanks Chen.
> 
> 

Thank you too.

-- 
Chen Gang

Asianux Corporation
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