Re: [PATCH 12/19] CacheFiles: Permit a process's create SID to beoverridden

[Karl MacMillan]

James Morris wrote:
> On Wed, 15 Nov 2006, David Howells wrote:
>
> > James Morris <jmorris@xxxxxxxxx> 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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