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https://issues.apache.org/jira/browse/MAPREDUCE-1994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12895458#action_12895458
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Todd Lipcon commented on MAPREDUCE-1994:
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Using its own path in order to detect HADOOP_HOME is probably still insecure,
though, since an attacker can hard link the task-controller into their own
location. We should probably check that the HADOOP_HOME directory and the
config file that it finds both have the same group ID as the task-controller
itself, and are not world-writable.
> Linux task-controller determines its own path insecurely
> --------------------------------------------------------
>
> Key: MAPREDUCE-1994
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1994
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: security, task-controller
> Affects Versions: 0.22.0
> Reporter: Todd Lipcon
> Priority: Critical
>
> The task-controller uses argv[0] to determine its own path, and then calls
> stat() on that. Instead it should stat("/proc/self/exe") directly. This is
> important since argv[0] can be spoofed to point to another program and thus
> either fool the autodetection of HADOOP_HOME or evade various permissions
> checks.
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