[Bug 222807] PURE entropy sources are harvested but not mixed in. Also, min-entropy low per SP800-90B measurements

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222807

--- Comment #12 from commit-hook at freebsd.org ---
A commit references this bug:

Author: cem
Date: Sat Oct  7 19:02:03 UTC 2017
New revision: 324394
URL: https://svnweb.freebsd.org/changeset/base/324394

Log:
  random(4): Gather entropy from Pure sources

  At initialization, hc_source_mask only includes non-Pure sources.

  The patch changes source registration to enable the registered source in the
  hc_source_mask bitmask. This mask governs which sources are harvested.

  This patch also disallows userspace from disabling such sources.

  PR:           222807
  Submitted by: W. Dean Freeman <badfilemagic AT gmail.com>
  Reviewed by:  jmg (earlier version), delphij
  Approved by:  secteam (delphij)
  Obtained from:        HBSD 0054e3e170e083811acc9f3b637f8be8a86c03e7
  Security:     yes
  Differential Revision:        https://reviews.freebsd.org/D12611

Changes:
  head/sys/dev/random/random_harvestq.c
  head/sys/dev/random/randomdev.c
  head/sys/sys/random.h

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