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

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Message-ID: <CAOS58YMxz5HfJUayqjw+SPj485M+wquTqQouk367rV2mfvVRHg@mail.gmail.com>
Date:	Sun, 26 Jun 2016 18:26:17 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Topi Miettinen <toiwoton@...il.com>
Cc:	"Serge E. Hallyn" <serge@...lyn.com>,
	lkml <linux-kernel@...r.kernel.org>, luto@...nel.org,
	Kees Cook <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, Topi.

On Sun, Jun 26, 2016 at 3:14 PM, Topi Miettinen <toiwoton@...il.com> wrote:
> The parent might be able do it if proc/pid/xyz files are still
> accessible after child exit but before its exit status is collected. But
> if the parent doesn't do it (and you are not able to change it to do it)
> and it collects the exit status without collecting other info, can you
> suggest a different way how another process could collect it 100% reliably?

I'm not saying that there's such mechanism now. I'm suggesting that
that'd be a more fitting way of implementing a new mechanism to track
capability usages.

Thanks.

-- 
tejun