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Description of problem:

When calling set*id after creating threads recent glibc does cross thread
signalling so that *id are set in all threads. When using raw syscalls or not
glibc, *id is set for the calling thread only.

initgroups (setgroups) in rhel glibc is not working that way. we are
missing upstream commit 70181fddf1467996bea393d13294ffe76b8a0853.

This blocks RHEL6 fix for CVE-2011-2527 (initgroups is called after multiple thread creation).

Upstream bug/fix:

http://sourceware.org/bugzilla/show_bug.cgi?id=10563
http://repo.or.cz/w/glibc.git/commitdiff/70181fddf1467996bea393d13294ffe76b8a0853

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHSA-2011-1526.html