linux-kernel - Re: [PATCH v4 3/3] Send cgroup_path in SCM

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Message-ID: <20140113165253.GC29053@htj.dyndns.org>
Date:	Mon, 13 Jan 2014 11:52:53 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Jan Kaluza <jkaluza@...hat.com>
Cc:	davem@...emloft.net, LKML <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org, eparis@...hat.com, rgb@...hat.com,
	lizefan@...wei.com, containers@...ts.linux-foundation.org,
	cgroups@...r.kernel.org, viro@...iv.linux.org.uk
Subject: Re: [PATCH v4 3/3] Send cgroup_path in SCM_CGROUP

On Mon, Jan 13, 2014 at 09:01:49AM +0100, Jan Kaluza wrote:
> Server-like processes in many cases need credentials and other
> metadata of the peer, to decide if the calling process is allowed to
> request a specific action, or the server just wants to log away this
> type of information for auditing tasks.
> 
> The current practice to retrieve such process metadata is to look that
> information up in procfs with the $PID received over SCM_CREDENTIALS.
> This is sufficient for long-running tasks, but introduces a race which
> cannot be worked around for short-living processes; the calling
> process and all the information in /proc/$PID/ is gone before the
> receiver of the socket message can look it up.
> 
> This introduces a new SCM type called SCM_CGROUP to allow the direct
> attaching of "cgroup_path" to SCM, which is significantly more
> efficient and will reliably avoid the race with the round-trip over
> procfs.
> 
> Signed-off-by: Jan Kaluza <jkaluza@...hat.com>

For cgroup related part:

 Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun
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