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From "Amareshwari Sriramadasu (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-899) When using LinuxTaskController, localized files may become accessible to unintended users if permissions are misconfigured.
Date Tue, 02 Feb 2010 05:52:19 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-899?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Amareshwari Sriramadasu updated MAPREDUCE-899:
----------------------------------------------

    Release Note: Added configuration "mapreduce.tasktracker.group", a group name to which
TaskTracker belongs. When LinuxTaskController is used, task-controller binary's group owner
should be this group. The same should be specified in task-controller.cfg also.

> When using LinuxTaskController, localized files may become accessible to unintended users
if permissions are misconfigured.
> ---------------------------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-899
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-899
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: tasktracker
>            Reporter: Vinod K V
>            Assignee: Amareshwari Sriramadasu
>             Fix For: 0.22.0
>
>         Attachments: MAPREDUCE-899-20090828.txt, patch-899-1.txt, patch-899-2.txt, patch-899-3.txt,
patch-899-4.txt, patch-899-5.txt, patch-899-6.txt, patch-899-7.txt, patch-899.txt, testplan.txt
>
>
> To enforce the accessibility of job files to only the job-owner and the TaskTracker,
as per MAPREDUCE-842, it is _trusted_ that the  setuid/setgid linux TaskController binary
is group owned by a _special group_ to which only TaskTracker belongs and not just any group
to which TT belongs. If the trust is broken, possibly due to misconfiguration by admins, the
local files become accessible to unintended users, yet giving false sense of security to the
admins.

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