Re: typebounds lookup from userspace

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On Tue, 2008-10-07 at 13:24 -0400, Eamon Walsh wrote:
> KaiGai Kohei wrote:
> > Joshua Brindle wrote:
> >   
> >> For symbol labeling purposes for policy access control we need to be able
> >>     
> >  > to look up symbol hierarchy relationships. I expect we'll do this by exporting
> >  > the symbol hierarchy via selinuxfs. Does anyone have suggestions on what that
> >  > should look like? Do we want to export additional information on the symbols
> >  > at the same time?
> >
> > I noticed that userspace object manager also need an interface to get metadata
> > of types to support permissive domain. Currently, we don't have any interface
> > to know what domain should be handled as permissive domain.
> >
> > If "/selinux/access" can return the 6th value to show whether the given query
> > should be handled as permissive domain or not, it helps userspace object managers.
> >   
> 
> Why does a userspace object manager need to know if a domain is marked
> permissive?  That should be hidden behind security_compute_av().

It would be hidden behind avc_has_perm() but not behind
security_compute_av().  And as SE-PostgreSQL implements its own variant
of the AVC, it would need that information.
> 
> 
> > It is undesirable for me to add a new interface to query whether the given domain
> > is permissive or not, because it cannot avoid atomicity matter.
> >
> > Thanks,
> >   
> 
> 
-- 
Stephen Smalley
National Security Agency


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