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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-2103) task-controller shouldn't require o-r permissions
Date Mon, 04 Oct 2010 04:08:34 GMT
task-controller shouldn't require o-r permissions

                 Key: MAPREDUCE-2103
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2103
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: task-controller
    Affects Versions: 0.22.0
            Reporter: Todd Lipcon
            Priority: Trivial

The task-controller currently checks that "other" users don't have read permissions. This
is unnecessary - we just need to make it's not executable. The debian policy manual explains
it well:

Setuid and setgid executables should be mode 4755 or 2755 respectively, and owned by the appropriate
user or group. They should not be made unreadable (modes like 4711 or 2711 or even 4111);
doing so achieves no extra security, because anyone can find the binary in the freely available
Debian package; it is merely inconvenient. For the same reason you should not restrict read
or execute permissions on non-set-id executables.

Some setuid programs need to be restricted to particular sets of users, using file permissions.
In this case they should be owned by the uid to which they are set-id, and by the group which
should be allowed to execute them. They should have mode 4754; again there is no point in
making them unreadable to those users who must not be allowed to execute them.

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