In the kernel-only portionss of System V IPC objects (messages,
message queues, shared memory segments, and semaphores), add a struct
label pointer, which will hold the MAC labels for the objects. As a
result of recent work to separate kernel and user space ABIs, this
should not break the ABI for applications using System V IPC, but will
require a rebuild of the ipcs monitoring tool.

Submitted by: Dandekar Hrishikesh <rishi_dandekar at sbcglobal dot net>
Obtained from: TrustedBSD Project
Sponsored by: DARPA, SPAWAR, McAfee Research