Subject: Re: [PATCH 08/28] SECURITY: Allow kernel services to override LSM
	settings for task actions [try #2]
From: Stephen Smalley <sds@tycho.nsa.gov>
To: David Howells <dhowells@redhat.com>
Cc: Daniel J Walsh <dwalsh@redhat.com>, casey@schaufler-ca.com,
       linux-kernel@vger.kernel.org, selinux@tycho.nsa.gov,
       linux-security-module@vger.kernel.org
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Content-Type: text/plain
Organization: National Security Agency
Date: Tue, 15 Jan 2008 09:58:48 -0500
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On Mon, 2008-01-14 at 14:06 +0000, David Howells wrote:
> David Howells <dhowells@redhat.com> wrote:
> 
> > Okay...  It looks like I want four security operations/hooks for cachefiles:
> 
> FYI, I added the following vectors:
> 
> 	# kernel services that need to override task security
> 	class kernel_service
> 	{
> 		use_as_override
> 		create_files_as
> 	}
> 
> The first allows:
> 
> 	avc_has_perm(daemon_tsec->sid, nominated_sid,
> 		     SECCLASS_KERNEL_SERVICE,
> 		     KERNEL_SERVICE__USE_AS_OVERRIDE,
> 		     NULL);
> 
> And the second something like:
> 
> 	avc_has_perm(tsec->sid, inode->sid,
> 		     SECCLASS_KERNEL_SERVICE,
> 		     KERNEL_SERVICE__CREATE_FILES_AS,
> 		     NULL);
> 
> Rather than specifically dedicating them to the cache, I made them general.

Make sure that you or Dan submits a policy patch to register these
classes and permissions in the policy when the kernel patch is queued
for merge.

-- 
Stephen Smalley
National Security Agency

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