linux-kernel - Re: [PATCH 3/5] v2 seccomp_filters: Enable ftrace-based system call filtering

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Date:	Wed, 25 May 2011 13:01:39 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Kees Cook <kees.cook@...onical.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Will Drewry <wad@...omium.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] v2 seccomp_filters: Enable ftrace-based system call filtering

On Wed, May 25, 2011 at 12:11 PM, Kees Cook <kees.cook@...onical.com> wrote:
>
> Uhm, what? Chrome would use it. And LXC would. Those were stated very
> early on as projects extremely interested in syscall filtering.

.. and I seriously doubt it is workable.

Or at least it needs some actual working proof-of-concept thing.
Exactly because of issues like direct rendering etc, that require some
of the nastier system calls to work at all.

As to your example of apache modules - last I saw, most of those were
written in high-level scripting languages that almost invariably end
up using quite a bit of the system call interfaces. And more
importantly, almost nobody does unportable code.

So hey, I'm willing to be convinced. But I'll need more than people
_saying_ that they'd be interested. Because judging by past
performance, nobody ever uses esoteric cool new features.

                           Linus
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