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

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Message-ID: <20100617211616.GA24749@outflux.net>
Date:	Thu, 17 Jun 2010 14:16:16 -0700
From:	Kees Cook <kees.cook@...onical.com>
To:	Randy Dunlap <rdunlap@...otime.net>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	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 02:06:30PM -0700, Randy Dunlap wrote:
> On Thu, 17 Jun 2010 21:53:49 +0100 Alan Cox wrote:
> 
> > > > SELinux users would not need the other LSM, and stacking is thus not 
> > > > required.
> > > 
> > > But if a user wants to disable ptrace using the SELinux LSM and then
> > > also disable sticky-symlinks via the ItsHideous LSM, they're out of luck.
> > 
> > Thats a nonsensical configuration so we don't care. If you are using
> > SELinux you just do it via SELinux. If you are doing it via
> > UbuntuHasToBeDifferent then you do it via that.
> 
> 
> Well, surely there are people who use something other than Ubuntu
> and also care about not using SELinux... eh?

And for them, it certainly seems like a good idea to be able to turn off
PTRACE without having to fiddle with an LSM.

-- 
Kees Cook
Ubuntu Security Team
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