[RFC][PATCH 4/8] ima: Add digest_cache_measure and digest_cache_appraise boot-time policies

[Mimi Zohar]

> > > @@ -971,6 +1006,16 @@ void __init ima_init_policy(void)
> > >  {
> > >  	int build_appraise_entries, arch_entries;
> > >  
> > > +	/*
> > > +	 * We need to load digest cache rules at the beginning, to avoid dont_
> > > +	 * rules causing ours to not be reached.
> > > +	 */
> > 
> > "lockdown" trusts IMA to measure and appraise kernel modules, if the rule
> > exists.  Placing the digest_cache first breaks this trust.
> 
> The new rules don't prevent other rules to be reached, since they are
> 'do' and not 'don_t' rules.

My mistake.  These are just the rules for measuring or appraising the digest
cache lists themselves, not the actual policy rules for using the digest_cache. 
This should be fine.

Perhaps update the comment to reflect initramfs usage.


thanks,

Mimi