[PATCH v3 1/2] vfs: Allow filesystems with foreign owner IDs to override UID checks

[David Howells]

Mimi Zohar <zohar at linux.ibm.com> wrote:

> On Tue, 2026-07-28 at 15:13 +0100, David Howells wrote:
> > 
> >  (*) IMA policy ops.
> > 
> >      Unchanged for now.  I'm not sure what the best way to deal with this
> >      is - if, indeed, it needs any changes.
> 
> IMA policy rules may be written in terms of the uid, euid and fowner.  Any
> changes, if necessary, would need to be made to ima_match_rules().

I think I can probably leave this for now as using uids mapped through the
namespace mapping mechanism.  To do otherwise would, I think, require the
possibility of encoding foreign IDs in IMA rules.  Something to consider in
the future, maybe, but I don't think I need to deal with that here.

Possibly, we could make a general rule that "for any otherwise unmapped
foreign ID, do X" sort of thing.

David