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

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Date:	Thu, 26 May 2011 15:09:06 -0400
From:	Eric Paris <eparis@...isplace.org>
To:	david@...g.hm
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Will Drewry <wad@...omium.org>,
	Colin Walters <walters@...bum.org>,
	Kees Cook <kees.cook@...onical.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org, James Morris <jmorris@...ei.org>
Subject: Re: [PATCH 3/5] v2 seccomp_filters: Enable ftrace-based system call filtering

On Thu, May 26, 2011 at 3:05 PM,  <david@...g.hm> wrote:
> On Thu, 26 May 2011, Ingo Molnar wrote:
>
>> * Linus Torvalds <torvalds@...ux-foundation.org> wrote:
>>
>>> It also gets rid of all configuration - one of the things that
>>> makes most security frameworks (look at selinux, but also just
>>> ACL's etc) such a crazy rats nest is the whole "set up for other
>>> processes". If it's designed very much to be about just the "self"
>>> process (after initialization etc), then I think that avoids pretty
>>> much all the serious issues.
>>
>> That's how the event filters work currently: even when inherited they
>> get removed when exec-ing a setuid task, so they cannot leak into
>> privileged context and cannot modify execution there.
>>
>> Inheritance works when requested, covering only same-credential child
>> tasks, not privileged successors.
>
> this is a very reasonable default, but there should be some way of saying
> that you want the restrictions to carry over to the suid task (I really know
> what I'm doing switch)

You mean the "i'm a hacker and want to be able to learn about tasks I
shouldn't be able to learn about" switch?  No.  You either get out of
the way on SUID or refuse to launch SUID apps.  Those are the only
reasonable choices.
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