Add pfs_visible() checks to pfs_getattr() and pfs_getextattr().  This also fixes pfs_access() since it relies on VOP_GETATTR() which will call pfs_getattr().  This prevents jailed processes from discovering the existence, start time and ownership of processes outside the jail.
Add pfs_visible() checks to pfs_getattr() and pfs_getextattr().  This
also fixes pfs_access() since it relies on VOP_GETATTR() which will call
pfs_getattr().  This prevents jailed processes from discovering the
existence, start time and ownership of processes outside the jail.

PR:		kern/48156

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase