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https://issues.apache.org/jira/browse/MAPREDUCE-1991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12894967#action_12894967
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Todd Lipcon commented on MAPREDUCE-1991:
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We also have to fix the checks on permissions - it currently uses argv[0] which
is spoofable. Calling stat on /proc/self/exe is going to be more secure (and
we've already used Linux-specific code elsewhere in the task controller)
> taskcontroller allows stealing permissions on any local file
> ------------------------------------------------------------
>
> Key: MAPREDUCE-1991
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1991
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: task-controller
> Affects Versions: 0.21.0, 0.22.0
> Reporter: Todd Lipcon
> Priority: Blocker
>
> The linux task-controller setuid binary allows a malicious user to chmod any
> file on the system to 644 (and as a side effect appends some junk to the end)
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