The ktrace utility in the FreeBSD kernel 8.4 before p11, 9.1 before p14, 9.2 before p7, and 9.3-BETA1 before p1 uses an incorrect page fault kernel trace entry size, which allows local users to obtain sensitive information from kernel memory via a kernel process trace.
http://www.securitytracker.com/id/1030325
http://www.securityfocus.com/bid/67812
http://www.freebsd.org/security/advisories/FreeBSD-SA-14%3A12.ktrace.asc