task-controller shouldn't require o-r permissions
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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:
{quote}
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.
{quote}
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