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<p style="margin: 10px 0 0 0">Note that this causes the shibd daemon to fail to boot with a "initgroups failed, check -u option" error when starting it from an unprivileged account while still specifying -u and/or -g on the command line, whereas this was not the case before.</p>
<p style="margin: 10px 0 0 0">The reason is that a call to initgroups() translates into a call to setgroups(), which in Linux always requires the CAP_SETGID capability, regardless of whether you are trying to add/drop or even keep group memberships the same. The reasoning is documented here: <a href="https://lwn.net/Articles/626665/" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://lwn.net/Articles/626665/</a></p>
<p style="margin: 10px 0 0 0">Ways around this:</p>
<ul class="alternate" type="square">
<li>
don't pass -u or -g on the command line when starting from a non-privileged account
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<li>
grant the shibd process the CAP_SETGID capability with setcap (although this causes the dynamic linker to unset LD_LIBRARY_PATH for security reasons, so may not be desirable for custom setups)
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