I wonder if it is time to bite the bullet and get rid of user-mode mounts entirely. Or maybe disallow them in suid'ed sessions? They are always going to be a security hole AFAICT.
I think that would be a bad idea. What if I want to install a private version of cygwin on a machine to which I don't have Admin access? (ITFascists can shut up right now; I'm not listening..."You vill use de Microsoft Application Suite ve haf provided, and nuzzing else!")
-- Chuck