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

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Date:	Thu, 26 May 2011 20:47:23 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	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


* 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.

Thanks,

	Ingo
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