linux-kernel - Re: [RFC,PATCH 1/2] seccomp_filters: system call filtering using BPF

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Date:	Thu, 12 Jan 2012 11:27:15 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Andrew Lutomirski <luto@....edu>
Cc:	Will Drewry <wad@...omium.org>, 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,
	jmorris@...ei.org, scarybeasts@...il.com, avi@...hat.com,
	penberg@...helsinki.fi, viro@...iv.linux.org.uk, 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 1/2] seccomp_filters: system call filtering using BPF

On Thu, 2012-01-12 at 08:14 -0800, Andrew Lutomirski wrote:

> The longer I linger on lists and see neat ideas like this, the more I
> get annoyed that execve is magical.  I dream of a distribution that
> doesn't use setuid, file capabilities, selinux transitions on exec, or
> any other privilege changes on exec *at all*. 

Is that the fear with filtering on execv? That if we have filters on an
execv calling a setuid program that we change the behavior of that
privileged program and might cause unexpected results?

In that case, just have execv fail if filtering is enabled and we are
execing a setuid program. But I don't see why non "magical" execv's
should be prohibited.

-- Steve


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