CVE request: kernel: exit_notify: kill the wrong capable(CAP_KILL) check

[Eugene Teo <eugene () redhat com>]

A malicious application can execute a setuid binary before exit. This
would mean that we will not reset the ->exit_signal to SIGCHLD unless
the binary drops CAP_KILL.

https://bugzilla.redhat.com/show_bug.cgi?id=493771
http://git.kernel.org/linus/432870dab85a2f69dc417022646cb9a70acf7f94

Chris/Greg, we probably need this in -stable.

Thanks, Eugene
-- 
Eugene Teo, RHCA, RHCSS / Red Hat Security Response Team