This isn't really something that can reasonably be secured against. The best a user can do is verify (with alt-F7, alt-F8, etc) that a new X session has been started when they select "switch user".
I'm open to any suggestions to improve the situation, though. Thanks! -- possible security issue with locked screen https://launchpad.net/bugs/82052 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
