UID mapping

[Ed Gould]

>Separate issue(s): 1) RFS-style mapping has, I think, been implemented
>by Cray, and 2) RFS also has, I think, the same notion of a "nobody" UID.

There are several issues associated with UID mapping.  One of the
potential problems with RFS, which claims to preserve *all* of the Unix
filesystem semantics, is that set-uid programs can fail to work
properly unless the maps are both one-to-one and invertable.  On big
servers with lots of administratively unrelated clients - the situation
where UID mapping is most needed - this may be a real problem if users
make their own set-uid programs and store them on the server.

-- 
Ed Gould                    mt Xinu, 2560 Ninth St., Berkeley, CA  94710  USA
ed at mtxinu.COM		    +1 415 644 0146

"I'll fight them as a woman, not a lady.  I'll fight them as an engineer."