linux-kernel - Re: [PATCH 3/7] seccomp_filter: Enable ftrace-based system call filtering

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Message-ID: <20110428142857.GC1798@nowhere>
Date:	Thu, 28 Apr 2011 16:29:00 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Will Drewry <wad@...omium.org>
Cc:	linux-kernel@...r.kernel.org, kees.cook@...onical.com,
	eparis@...hat.com, agl@...omium.org, mingo@...e.hu,
	jmorris@...ei.org, rostedt@...dmis.org,
	Ingo Molnar <mingo@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>, Michal Marek <mmarek@...e.cz>,
	Oleg Nesterov <oleg@...hat.com>,
	Roland McGrath <roland@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Slaby <jslaby@...e.cz>,
	David Howells <dhowells@...hat.com>,
	"Serge E. Hallyn" <serge@...lyn.com>
Subject: Re: [PATCH 3/7] seccomp_filter: Enable ftrace-based system call
 filtering

On Wed, Apr 27, 2011 at 10:08:47PM -0500, Will Drewry wrote:
> This change adds a new seccomp mode based on the work by
> agl@...omium.org. This mode comes with a bitmask of NR_syscalls size and
> an optional linked list of seccomp_filter objects. When in mode 2, all

Since you now use the filters. Why not using them to filter syscalls
entirely rather than using a bitmap of allowed syscalls?

You have the "nr" field in syscall tracepoints.
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