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From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Wed, 25 May 2011 13:01:39 -0700
Message-ID: <BANLkTimYs4rkgP+hmnG3atLhhCz+jQF=Dg@mail.gmail.com>
Subject: Re: [PATCH 3/5] v2 seccomp_filters: Enable ftrace-based system call filtering
To: Kees Cook <kees.cook@canonical.com>
Cc: Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
        Peter Zijlstra <peterz@infradead.org>, Will Drewry <wad@chromium.org>,
        Steven Rostedt <rostedt@goodmis.org>, linux-kernel@vger.kernel.org
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On Wed, May 25, 2011 at 12:11 PM, Kees Cook <kees.cook@canonical.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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