Review Request 119011: KInit: call setgroups(0, 0) before calling setgid()

[Commit Hook]

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This review has been submitted with commit ff5ea1ab8568893c7d7b3a4518997080d3533308 by Dan Vrátil to branch master.

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On June 29, 2014, 10:50 a.m., Dan Vrátil wrote:
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> https://git.reviewboard.kde.org/r/119011/
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> (Updated June 29, 2014, 10:50 a.m.)
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> Review request for KDE Frameworks.
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> Repository: kinit
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> Description
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> While packaging kinit, we got a warning from rpmlint that start_kdeinit calls setgid() without calling setgroups() first. From rpmlint:
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>    This executable is calling setuid and setgid without setgroups or initgroups.
>    There is a high probability this mean it didn't relinquish all groups, and
>    this would be a potential security issue to be fixed. Seek POS36-C on the web
>    for details about the problem.
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> The reasoning is that when you drop privileges from root to regular user, there might be some extra groups left that, if not cleared, might grant the process privileges to do superuser things.
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> The code does not check for return value, as the call will fail if we are not a superuser.
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> This oneliner makes rpmlint happy and maybe prevents a security issue.
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> Diffs
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>   src/start_kdeinit/start_kdeinit.c 07a28d3 
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> Diff: https://git.reviewboard.kde.org/r/119011/diff/
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> Testing
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> Thanks,
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> Dan Vrátil
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