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Re: libsemage patch to not compile modules for seusers and fcontext

From: Stephen Smalley <sds_at_tycho.nsa.gov>
Date: Wed, 27 Aug 2008 08:04:08 -0400

On Tue, 2008-08-26 at 21:52 -0400, Ivan Gyurdiev wrote:
> >> I'm a little unclear on what this is doing - can you clarify?
> >>
> > This is clearing the existing seusers.final file, otherwise delete was
> > not working.
> >
> I think the previous code was doing more - it was merging the local file
> with the shipped base package file, like this:
>
> data = extract_file_from_policy_package( )
> write_file ( "seusers.final", data )
> if ( data != null ) {
> seusers.clear_cache() // thereby forcing reload from
> seusers.final when cache() is called again (in merge_components)
> } else {
> seusers.clear()
> }
>
> It's also doing this three times (once for fcontexts, once for seusers,
> once for seusers_extra).
> The problem is that you're skipping the link_sandbox call, which builds
> the base package, containing this information.

We're trying to avoid the overhead of re-linking the policy when we are only modifying non-policy components like seusers and fcontexts. fcontexts.local is split out to a separate file for precedence reasons so it doesn't get merged anymore. I don't think Dan actually uses seusers in the base policy for anything at present, but others may be.

-- 
Stephen Smalley
National Security Agency


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Received on Wed 27 Aug 2008 - 08:04:10 EDT
 

Date Posted: Jan 15, 2009 | Last Modified: Jan 15, 2009 | Last Reviewed: Jan 15, 2009

 
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