I don't think it's su, as su is something like 10 lines.
All it does is check the password, setuid() and setgid(), and exec().
I suspect bash.
It _could_ be PAM though.

-- 
after sudo su (su -), gnome-terminal [or a virtual terminal "-bash"] "exit"s 
("logout"s) with any single keypress
https://bugs.launchpad.net/bugs/224802
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