When building rpm packages for openSUSE, rpmlint prints the following complaint:

[  130s] xrootd-fuse.x86_64: E: missing-call-to-setgroups-before-setuid /usr/bin/xrootdfs
[  130s] xrootd-libs.x86_64: E: missing-call-to-setgroups-before-setuid /usr/lib64/libXrdUtils.so.3.0.0
[  130s] xrootd-server.x86_64: E: missing-call-to-setgroups-before-setuid /usr/bin/cmsd
[  130s] xrootd-server.x86_64: E: missing-call-to-setgroups-before-setuid /usr/bin/xrootd
[  130s] This executable is calling setuid and setgid without setgroups or initgroups.
[  130s] This means it didn't relinquish all groups, and this would be a potential
[  130s] security issue.

I am not very conversant with particulars about setuid usage myself, but here is some documentation that may help:
https://wiki.sei.cmu.edu/confluence/plugins/servlet/mobile?contentId=87152295#content/view/87152295

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