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From "Ravi Gummadi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1991) taskcontroller allows stealing permissions on any local file
Date Fri, 27 Aug 2010 06:16:57 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12903248#action_12903248
] 

Ravi Gummadi commented on MAPREDUCE-1991:
-----------------------------------------

I meant the following for the following 8 linux task controller based tests:

TestLocalizationWithLinuxTaskController
TestTrackerDistributedCacheManagerWithLinuxTaskController
TestJobExecutionAsDifferentUser
TestStreamingAsDifferentUser
TestPipesAsDifferentUser
TestDebugSciptWithLinuxTaskController
TestKillSubProcessesWithLinuxTaskController
TestLinuxTaskController


Sample test run as tasktracker_user(Jobs in the test are run as same user as the user who
started the tasktracker):

user1$ ant test -Dtaskcontroller-path=<Path_Of_Directory_In_which_taskController_Is_setup>
-Dtaskcontroller-ugi=user1,group_of_user1 -Dtest.output=yes -Dtestcase=TestLocalizationWithLinuxTaskController

Sample test run as other_user(Jobs in the test are run as different user than the user who
started the tasktracker):

user1$ ant test -Dtaskcontroller-path=<Path_Of_Directory_In_which_taskController_Is_setup>
-Dtaskcontroller-ugi=other_user,group_of_other_user -Dtest.output=yes -Dtestcase=TestLocalizationWithLinuxTaskController


<Path_Of_Directory_In_which_taskController_Is_setup>  is the directory under which task-controller
executable exists and its owner and group are set to root:tt_special_group and permissions
are set to rwsr-s---. Here, tt_special_group is the group in which task tracker user is the
only member(The user who is running the above ant commands is task tracker user).
other_user,group_of_other_user can be nobody,nobody(which mostly exist on all linux machines).

> 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: 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Blocker
>         Attachments: mapreduce-1991-v2.txt, mapreduce-1991.txt
>
>
> 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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