Fix sendmail improper close-on-exec flag handling. [SA-14:11]

Fix ktrace memory disclosure. [SA-14:12]

Fix incorrect error handling in PAM policy parser. [SA-14:13]

Fix triple-fault when executing from a threaded process. [EN-14:06]

Approved by:	so
Merge remote-tracking branch 'freebsd/releng/9.2' into 9.2.1-BRANCH