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

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Message-ID: <519DFFFB.40104@asianux.com>
Date:	Thu, 23 May 2013 19:39:39 +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] ipv4: netfilter: always let NUL terminated string ended
 by '\0'

On 05/23/2013 07:08 PM, Pablo Neira Ayuso wrote:
> On Fri, May 17, 2013 at 04:39:15PM +0800, Chen Gang wrote:
>> > 
>> > For NUL terminated string, better always be sure of ended by '\0'.
>> > 
>> > '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.
> loginfo->prefix is always nul-terminated, as this is validated in
> checkentry. I don't think the kernel will take a non nul-terminated
> device name either.
> 
> 

Really it is.

And 'prefix' max length is 128 (NF_LOG_PREFIXLEN), and 'pm->prefix' max
length is 32 (ULOG_PREFIX_LEN), so we still need this patch, but need
improved.

So I should send patch v2.


Thanks.
-- 
Chen Gang

Asianux Corporation
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