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

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Date:	Thu, 12 Jan 2012 17:30:48 +0000
From:	Jamie Lokier <jamie@...reable.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Oleg Nesterov <oleg@...hat.com>, 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,
	luto@....edu, mingo@...e.hu, akpm@...ux-foundation.org,
	khilman@...com, borislav.petkov@....com, amwang@...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

Steven Rostedt wrote:
> On Thu, 2012-01-12 at 17:14 +0100, Oleg Nesterov wrote:
> 
> > May be this needs something like LSM_UNSAFE_SECCOMP, or perhaps
> > cap_bprm_set_creds() should take seccomp.mode == 2 into account, I dunno.
> > 
> > OTOH, currently seccomp.mode == 1 doesn't allow to exec at all.
> 
> I've never used seccomp, so I admit I'm totally ignorant on this topic.
> 
> But looking at seccomp from the outside, the biggest advantage to this
> would be the ability for normal processes to be able to limit tasks it
> kicks off. If I want to run a task in a sandbox, I don't want to be root
> to do so.
> 
> I guess a web browser doesn't perform an exec to run java programs.

Actually it does.  Firefox on Linux forks and execs the Java VM.
Same for Flash, using "plugin-container".

> But it would be nice if I could execute something from the command
> line that I could run in a sand box.

You can do this now, using ptrace().  It's horrible, but half of the
horribleness is needing to understand machine-dependent registers,
which this new patch doesn't address.  (The other half is a ton of
undocumented but important ptrace() behaviours on Linux.)

-- Jamie
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