I'm seeing setuid problems with 2.6.29-rc2.  I've narrowed the problem
down to the 2 attached test files.  test1, a setuid root program drops
root euid (by calling setresuid()), then execs test2 (a non-setuid
program).  Test2 then execs test1, but test1's euid isn't set back to 0
as it should be.

After doing a git bisect, here's the change that causes the problem:

commit d84f4f992cbd76e8f39c488cf0c5d123843923b1
Author: David Howells <dhowells@redhat.com>
Date:   Fri Nov 14 10:39:23 2008 +1100

    CRED: Inaugurate COW credentials

I believe this regression is tied to the fact that test2 creates a 2nd
thread (that does nothing).  Without the 2nd thread, the test runs
correctly.

-- 
David Smith
dsmith@redhat.com
Red Hat
http://www.redhat.com
256.217.0141 (direct)
256.837.0057 (fax)