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From: ggm@brolga.cc.uq.oz.au (George Michaelson)
Newsgroups: comp.unix.internals
Subject: hiding files under a mount point.
Message-ID: <1991Mar18.045734.5114@brolga.cc.uq.oz.au>
Date: 18 Mar 91 04:57:34 GMT
Organization: Prentice Computer Centre, The University of Queensland, Australia.
Lines: 16


If you have some files in a directory eg /usr (on the root partition)
and you mount the filesystem /usr over them, they become "invisible".

How "invisible" are they? Can this be exploited meaningfully by sysops
or others to provide secure online storage of files you don't want
mortals to know about? (/usr is a bad example. unmounting makes the
system pretty useless. some other places might be more bearable.)

	-george

-- 
	G.Michaelson
Internet: G.Michaelson@cc.uq.oz.au                     Phone: +61 7 365 4079
  Postal: George Michaelson, the Prentice Centre,
          The University of Queensland, St Lucia, QLD Australia 4072.