linux-kernel - Re: [PATCH 5/7] seccomp_filter: Document what seccomp

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Date:	Thu, 5 May 2011 08:14:06 -0500
From:	"Serge E. Hallyn" <serge@...lyn.com>
To:	Will Drewry <wad@...omium.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Eric Paris <eparis@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org, kees.cook@...onical.com,
	agl@...omium.org, jmorris@...ei.org,
	Randy Dunlap <rdunlap@...otime.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tom Zanussi <tzanussi@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 5/7] seccomp_filter: Document what seccomp_filter is and
 how it works.

Quoting Will Drewry (wad@...omium.org):
> In particular, if the userspace code wants to stage some filters and
> apply them all at once, when ready, I'm not sure that it makes sense
> to me to put that complexity in the kernel itself.  For instance,

Hi Will,

just one note - in my original comment I wasn't actually suggesting
disabling setting of filters through a writeable file - I was only
suggesting restricting writing to one's own filters file.

All the better if it is possible to get a nice prctl-only
interface, but if it ends up limiting rule expressiveness (or taking
years to define an interface) then perhaps we should stick with
prctl for setting seccomp mode, and a more expressive file interface
for defining filters.

-serge
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