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

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Date:	Sun, 20 Jun 2010 22:16:13 -0400
From:	Valdis.Kletnieks@...edu
To:	James Morris <jmorris@...ei.org>
Cc:	Theodore Tso <tytso@....edu>,
	Casey Schaufler <casey@...aufler-ca.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Kees Cook <kees.cook@...onical.com>,
	Randy Dunlap <rdunlap@...otime.net>,
	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 Mon, 21 Jun 2010 10:52:11 +1000, James Morris said:

> Note that people using SELinux or AppArmor already have the ability to 
> restrict ptrace, and they would thus not need to stack this function if it 
> were in a separate LSM.

That's assuming they can figure out how to write and integrate the required
policy changes. Looking inside selinux-policy-3.8.3-4.fc14.src.rpm from Fedora
Rawhide: (Holy cow, there's a .git tree in that tarball - no wonder it's 20M in
size).

% cd serefpolicy-3.8.3/policy/modules; wc -l */* | grep total
 135967 total

135kloc of policy that probably nobody in your shop really understands.  At
that point, writing something that stacks starts sounding really enticing.



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