Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/9731#issuecomment-157500087
I'm going to go ahead and merge this, as it's a bug fix update anyway,
passes, and should make sure there's no exploit of this form. We may not be
alone in getting some alarmed customer questions about this, even though I
suspect there is no actual exploit in Spark.
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