o Introduce kern.security.bsd.unprivileged_read_msgbuf, which allows   the administrator to restrict access to the kernel message buffer.   It defaults to '1', which permits access, but if set to '0', requires   that the process making the sysctl() have appropriate privilege. o Note that for this to be effective, access to this data via system   logs derived from /dev/klog must also be limited.
o Introduce kern.security.bsd.unprivileged_read_msgbuf, which allows
  the administrator to restrict access to the kernel message buffer.
  It defaults to '1', which permits access, but if set to '0', requires
  that the process making the sysctl() have appropriate privilege.
o Note that for this to be effective, access to this data via system
  logs derived from /dev/klog must also be limited.

Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, NAI Labs

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