linux-kernel - Re: [PATCH 12/19] CacheFiles: Permit a process's create SID to be overridden

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Date:	Wed, 15 Nov 2006 12:54:46 -0500
From:	Karl MacMillan <kmacmillan@...talrootkit.com>
To:	James Morris <jmorris@...ei.org>
CC:	David Howells <dhowells@...hat.com>,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...l.org>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	trond.myklebust@....uio.no, selinux@...ho.nsa.gov,
	linux-kernel@...r.kernel.org, aviro@...hat.com, steved@...hat.com
Subject: Re: [PATCH 12/19] CacheFiles: Permit a process's create SID to be
 overridden

James Morris wrote:
> On Wed, 15 Nov 2006, David Howells wrote:
> 
>> James Morris <jmorris@...ei.org> wrote:
>>
>>> The ability to set this needs to be mediated via MAC policy.
>> Something like this, you mean?
> 
> Yes, although perhaps writing to tsec->kern_create_sid or similar, which 
> then overrides tsec->create_sid if set.  Also need 
> /proc/pid/attr/kern_fscreate as a read only node.
> 
> 
>> +	error = task_has_perm(current, current, PROCESS__SETFSCREATE);
> 
> I wonder if we also need 'relabelto' and 'relabelfrom' permissions, to 
> control which labels are being used.
> 

No - assuming the existing checks are called, the controls on 
file/dir/etc creation should be sufficient to control which labels are 
used. Setting fscreate is not a relabel operation nor does it result in 
a relabel operation as the sid is only used for creation.

Karl


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