linux-kernel - Re: [PATCH] ptrace: allow restriction of ptrace scope

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Message-ID: <20100617222504.GD24749@outflux.net>
Date:	Thu, 17 Jun 2010 15:25:04 -0700
From:	Kees Cook <kees.cook@...onical.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Randy Dunlap <rdunlap@...otime.net>,
	James Morris <jmorris@...ei.org>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Kosina <jkosina@...e.cz>,
	Dave Young <hidave.darkstar@...il.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Roland McGrath <roland@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	David Howells <dhowells@...hat.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-doc@...r.kernel.org, Stephen Smalley <sds@...ho.nsa.gov>,
	Daniel J Walsh <dwalsh@...hat.com>,
	linux-security-module@...r.kernel.org
Subject: Re: [PATCH] ptrace: allow restriction of ptrace scope

On Thu, Jun 17, 2010 at 11:18:59PM +0100, Alan Cox wrote:
> > And for them, it certainly seems like a good idea to be able to turn off
> > PTRACE without having to fiddle with an LSM.
> 
> But that *is* an LSM, its a security policy.
> 
> You don't seem to get it - even the default kernel security is a
> security policy (security/commoncap.c etc)

I do get it.  I also get that every LSM calls out to commoncap, making
it effectively stacked with the primary LSM -- the only LSM that gets
stacked.  In fact, this is how I even started implementing these features:
as patches to commoncap, but James preferred it to be in core since they
are of general utility.  But core people want the changes in security/
instead.

I don't mind putting them in commoncap at all.  I would just like people
to agree on what they disagree about.  :)

-Kees

-- 
Kees Cook
Ubuntu Security Team
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