On Mon, Jun 30, 2014 at 3:28 AM, David Drysdale [off-list ref] wrote:

If the LSM does not provide implementations of the .file_lookup and
.file_install LSM hooks, always use the Capsicum implementations.

The Capsicum implementation of file_lookup checks for a Capsicum
capability wrapper file and unwraps to if the appropriate rights
are available.

The Capsicum implementation of file_install checks whether the file
has restricted rights associated with it.  If it does, it is replaced
with a Capsicum capability wrapper file before installation into the
fdtable.

I think I fall on the "no LSM" side of the fence.  This kind of stuff
should be available regardless of selected LSM (as it is in your
code), but until someone has a use case for the LSM hooks in real
LSMs, I don't really see the point.

--Andy