[jira] [Commented] (MAPREDUCE-2178) Race condition in LinuxTaskController permissions handling

["Nigel Daley (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13048404#comment-13048404 ] 

Nigel Daley commented on MAPREDUCE-2178:
----------------------------------------

Todd, is there a new patch you were planning to upload?  From previous comments it looks like he's waiting on that. 

> 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: 0001-Amend-MAPREDUCE-2178.-Fix-racy-check-for-config-file.patch, 0002-Amend-MAPREDUCE-2178.-Check-argc-after-checks-for-pe.patch, 0003-Amend-MAPREDUCE-2178.-Check-result-of-chdir.patch, ac-sys-largefile.patch, mapreduce-2178-test-compile-fix.txt, mr-2178-0.22.txt, mr-2178-error-on-launch-fail.txt, mr-2178-y20-sortof.patch, racy-config-check-test-changes.txt
>
>
> 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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