Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/4509#issuecomment-74139464
That's ok because the temp dir would be created underneath one of the "root
local dirs" created by the `getOrCreateLocalRootDirs` method here:
https://github.com/apache/spark/pull/4509/files#diff-d239aee594001f8391676e1047a0381eR698
So the top-most directory would have the right permissions (700 in the
usual case, or whatever permissions Yarn sets when talking about Yarn
containers). That's enough to prevent access to the underlying tree.
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