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bug#8117: ln to /tmp is irreversible

From: Křištof Želechovski
Subject: bug#8117: ln to /tmp is irreversible
Date: Fri, 25 Feb 2011 17:54:33 +0100
User-agent: KMail/1.13.6 (Linux/; KDE/4.6.0; x86_64; ; )

== To reproduce: ==

  1. Find a file in /tmp owned by somebody else and not owned by you.  Say 
  2. { ln a.txt b1.txt; } # you created b.txt based on a.txt
  3. {  rm b1.txt; } # error: Operation not permitted.
  4. Go to step 2, replacing b1 by b2, and so on.
(  5. ??? )
(  6. Profit. )

== The conclusion ==
Allowing irreversible operations is a bad thing, and this is not a circumstance 
where an exception would be appropriate.  The tool ln should not allow the 
operator to create an entry he cannot delete.

== Workaround ==
Never put anything into /tmp.  Use /tmp/kde-$LOGNAME (or whatever your 
directory is) instead.


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