linux-kernel - Re: [PATCH] capabilities: add capability cgroup controller

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Date:	Fri, 24 Jun 2016 13:24:47 -0400
From:	Tejun Heo <tj@...nel.org>
To:	"Serge E. Hallyn" <serge@...lyn.com>
Cc:	Topi Miettinen <toiwoton@...il.com>, linux-kernel@...r.kernel.org,
	luto@...nel.org, keescook@...omium.org,
	Jonathan Corbet <corbet@....net>,
	Li Zefan <lizefan@...wei.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	James Morris <james.l.morris@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Howells <dhowells@...hat.com>,
	David Woodhouse <David.Woodhouse@...el.com>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Petr Mladek <pmladek@...e.com>,
	"open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
	"open list:CONTROL GROUP (CGROUP)" <cgroups@...r.kernel.org>,
	"open list:CAPABILITIES" <linux-security-module@...r.kernel.org>
Subject: Re: [PATCH] capabilities: add capability cgroup controller

Hello, Serge.

On Fri, Jun 24, 2016 at 11:59:10AM -0500, Serge E. Hallyn wrote:
> > Just monitoring is less jarring than implementing security enforcement
> > via cgroup, but it is still jarring.  What's wrong with recursive
> > process hierarchy monitoring which is in line with the whole facility
> > is implemented anyway?
> 
> As I think Topi pointed out, one shortcoming is that if there is a short-lived
> child task, using its /proc/self/status is racy.  You might just miss that it
> ever even existed, let alone that the "application" needed it.

But the parent can collect whatever its children used.  We already do
that with other stats.

Thanks.

-- 
tejun