Is it possible to disable the
/proc pseudo-filesystem to prevent
top, etc, from showing what other users are doing? Of course, I still want "everything else" to work correctly. Is there a workable way to do this?
There is the grsecurity patchset (included in SELinux, but doesn't have the latter's horribly complicated MAC permission system) for the Linux kernel which offers the option of allowing only the owner (and root) to see his/her processes. It also offers other goodies without being as intrusive as SELinux.
A similar option is there on Solaris, or so I heard.
If you disable
It might be workable to give