jamie ae3e1ed6d1 Add a new jail permission, allow.read_msgbuf. When true, jailed processes
can see the dmesg buffer (this is the current behavior).  When false (the
new default), dmesg will be unavailable to jailed users, whether root or
not.

The security.bsd.unprivileged_read_msgbuf sysctl still works as before,
controlling system-wide whether non-root users can see the buffer.

PR:		211580
Submitted by:	bz
Approved by:	re@ (kib@)
MFC after:	3 days
2018-10-17 16:11:43 +00:00
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