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From: "Serge E. Hallyn" <serge-A9i7LUbDfNHQT0dZR+AlfA@public.gmane.org>
Subject: Re: [PATCH] capabilities: add capability cgroup controller
Date: Mon, 27 Jun 2016 14:49:41 -0500
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To: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Topi Miettinen <toiwoton-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, "Serge E. Hallyn" <serge-A9i7LUbDfNHQT0dZR+AlfA@public.gmane.org>, lkml <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, luto-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, Kees Cook <keescook-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>, Jonathan Corbet <corbet-T1hC0tSOHrs@public.gmane.org>, Li Zefan <lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>, Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>, Serge Hallyn <serge.hallyn-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org>, James Morris <james.l.morris-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>, Andrew Morton <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>, David Howells <dhowells-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, David Woodhouse <David.Woodhouse-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>, Ard Biesheuvel <ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>, "Paul E. McKenney" <paulmck-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>, Petr Mladek <pmladek-IBi9RG/b67k@public.gmane.org>, "open list:DOCUMENTATION" <linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, "open list:CONTROL GROUP (CGROUP)" <cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, "open list:CAPABILITIES" <linux-security-module-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>

Quoting Tejun Heo (tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org):
> Hello,
> 
> On Mon, Jun 27, 2016 at 3:10 PM, Topi Miettinen <toiwoton-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > I'll have to study these more. But from what I saw so far, it looks to
> > me that a separate tool would be needed to read taskstats and if that
> > tool is not taken by distros, the users would not be any wiser, right?
> > With cgroup (or /proc), no new tools would be needed.
> 
> That is a factor but shouldn't be a deciding factor in designing our
> user-facing interfaces. Please also note that kernel source tree
> already has tools/ subdirectory which contains userland tools which
> are distributed along with the kernel.

And, if you take audit+cgroup approach then no tools are needed.  So long
as you can have audit print out the cgroups for a task as part of the
capability audit record.