Path: utzoo!attcan!uunet!jarthur!usc!cs.utexas.edu!rice!sun-spots-request
From: auspex!guy@uunet.uu.net (Guy Harris)
Newsgroups: comp.sys.sun
Subject: Re: Nested Exports
Keywords: Software
Message-ID: <9394@brazos.Rice.edu>
Date: 27 Jun 90 18:16:16 GMT
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Organization: Sun-Spots
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X-Refs:  Original: v9n234
X-Sun-Spots-Digest: Volume 9, Issue 236, message 13

|Does the restriction that you cannot export both a tree and a subtree on
|the same filesystem still apply?

Yes.

|If so does this mean that you can't export a whole partition to one
|machine and a restricted piece to another?

Yes.

|Whats the reason for this restriction?

Because, even if that restriction didn't exist, you *still* couldn't
securely export a whole partition to one machine and a restricted piece to
another, if your intent was to restrict the access of the "another" to the
rest of the tree.  The "another" could walk up the directory tree and get
out of its restricted piece....  (The code might have to implement
something other than standard UNIX semantics for doing ".." up above a
mount point, but that's just a Simple Matter of Programming....)