Incorrect (?) documentation for setreuid(2) could lead to security issues for user code

[Chris Palmer]

According to section 6.4.1 of "Setuid Demystified":

http://www.cs.ucdavis.edu/~hchen/paper/usenix02.html

FreeBSD 4.4's setreuid(2) man page is wrong. The man page for FBSD 7 says
the same thing. Is it still wrong, or was the implementation changed to
match the documentation?

This person noticed the same problem for OBSD:

http://www.nabble.com/setreuid()-documentation-is-confusing-and-wrong-td7953251.html