permissions on /usr/preserve

[Lepreau at UTAH-20.ARPA]

From:  Jay Lepreau <Lepreau at UTAH-20.ARPA>

I looked into this awhile ago, and it appeared to me that as ex.recover
and preserve are written, making /usr/preserve 777 would open up a hole.
Those programs should work, at least in 4.2, with it 755 (they are
setuid).  Have CCA emacs put its files somewhere else, say /usr/tmp.

No guarantees above is correct, I only took a quick look.

{hplabs,harpo}!utah-cs!lepreau
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