linux-kernel - Re: [RFC,PATCH 2/2] Documentation: prctl/seccomp

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Date:	Thu, 12 Jan 2012 11:25:22 -0600
From:	Will Drewry <wad@...omium.org>
To:	Łukasz Sowa <luksow@...il.com>
Cc:	linux-kernel@...r.kernel.org, keescook@...omium.org,
	john.johansen@...onical.com, serge.hallyn@...onical.com,
	coreyb@...ux.vnet.ibm.com, pmoore@...hat.com, eparis@...hat.com,
	djm@...drot.org, torvalds@...ux-foundation.org,
	segoon@...nwall.com, rostedt@...dmis.org, jmorris@...ei.org,
	scarybeasts@...il.com, avi@...hat.com, penberg@...helsinki.fi,
	viro@...iv.linux.org.uk, luto@....edu, mingo@...e.hu,
	akpm@...ux-foundation.org, khilman@...com, borislav.petkov@....com,
	amwang@...hat.com, oleg@...hat.com, ak@...ux.intel.com,
	eric.dumazet@...il.com, gregkh@...e.de, dhowells@...hat.com,
	daniel.lezcano@...e.fr, linux-fsdevel@...r.kernel.org,
	linux-security-module@...r.kernel.org, olofj@...omium.org,
	mhalcrow@...gle.com, dlaor@...hat.com
Subject: Re: [RFC,PATCH 2/2] Documentation: prctl/seccomp_filter

On Thu, Jan 12, 2012 at 7:13 AM, Łukasz Sowa <luksow@...il.com> wrote:
> Hi Will,
>
> That's very different approach to the system call interposition problem.
> I find you solution very interesting. It gives far more capabilities
> than my syscalls cgroup that you commented on some time ago. It's ready
> now but I haven't tried filtering yet. I think that if your solution
> make it to the mainline (and I guess that's really possible at current
> stage :)), there will be no place for mine solution but that's ok.

Yeah - there've been so many tries, I'll be happy when one makes it in
which is usable :)

> There's one thing that I'm curious about - have you measured overhead in
> any way? That was one of the biggest issues in all previous attempts to
> limit syscalls. I'd love to compare the numbers with mine solution.

Certainly. I have some rough numbers, but nothing I'd call strong
measurements.  There is still a fair amount of cost due to the syscall
slow path.

> I'll examine your patch later on and put some comments if I bump into
> something.

Much appreciated - cheers!
will
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