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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-2178) Race condition in LinuxTaskController permissions handling
Date Fri, 11 Feb 2011 20:23:58 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2178?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated MAPREDUCE-2178:
-----------------------------------

    Attachment: mr-2178-y20-sortof.patch

Attaching a patch for this extracted from Arun's patch on HADOOP-7108. This isn't a complete
patch nor does it apply to any ASF branch, but useful for discussion.

> Race condition in LinuxTaskController permissions handling
> ----------------------------------------------------------
>
>                 Key: MAPREDUCE-2178
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2178
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: security, task-controller
>    Affects Versions: 0.22.0
>            Reporter: Todd Lipcon
>            Priority: Blocker
>             Fix For: 0.22.0
>
>         Attachments: mr-2178-y20-sortof.patch
>
>
> The linux-task-controller executable currently traverses a directory heirarchy and calls
chown/chmod on the files inside. There is a race condition here which can be exploited by
an attacker, causing the task-controller to improprly chown an arbitrary target file (via
a symlink) to the user running a MR job. This can be exploited to escalate to root.
> [this issue was raised and discussed on the security@ list over the last couple of months]

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