There are parts of conky that are linux-only but that are the parts that do 
things like examine hardware, the rest should work on everything 
POSIX-compatible.
There is idd still a period between file_exists() and fopen() but the only 
thing that happens in that time is a stat().
I am by no means a security expert so i could be wrong, but i don't see how a 
attacker could make that stat() hang long enough to create a symlink

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https://bugs.launchpad.net/bugs/607309

Title:
  vulnerability: rewrite arbitrary user file

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