netdev - Re: [PATCH 6/6] Export the tcp sock's security context to proc.

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Message-ID: <4E40F5D6.5060704@windriver.com>
Date:	Tue, 9 Aug 2011 16:54:46 +0800
From:	Rongqing Li <rongqing.li@...driver.com>
To:	David Miller <davem@...emloft.net>
CC:	<netdev@...r.kernel.org>, <selinux@...ho.nsa.gov>,
	<linux-security-module@...r.kernel.org>, <sds@...ho.nsa.gov>
Subject: Re: [PATCH 6/6] Export the tcp sock's security context to proc.

On 08/09/2011 03:33 PM, David Miller wrote:
> From:<rongqing.li@...driver.com>
> Date: Tue, 9 Aug 2011 15:28:30 +0800
>
>>   	if (v == SEQ_START_TOKEN) {
>>   		seq_printf(seq, "%-*s\n", TMPSZ - 1,
>>   			   "  sl  local_address rem_address   st tx_queue "
>>   			   "rx_queue tr tm->when retrnsmt   uid  timeout "
>> -			   "inode");
>> +			   "inode seclabel");
>>   		goto out;
>>   	}
>
> Unfortunately you cannot change the layout of procfs file output in
> this way.  It has the potential to break programs which are parsing
> this file in userspace already.
>
> The layout hasn't changed in a very long time because it is essentially
> a uservisible ABI.
>
> If you want to export new information you'll have to do it using the
> facility that is extensible, and that's the netlink based socket dumping
> facility implemented in inet_diag.c, tcp_diag.c and friends.
>
> There, you can simply add a new netlink attribute that gets dumped with
> the entry, which will provide the security context.
>
>

Thanks, I see how I should do.
I will continue to develop it and hope get your help.
Thanks.


-- 
Best Reagrds,
Roy | RongQing Li
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