[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 #7 from W. Dean Freeman <badfilemagic at gmail.com> ---
(In reply to Conrad Meyer from comment #6)

I shall have to learn to use Phabricator then. I'll figure it out as soon as
possible.

For RDRND and Via, if they don't register they'll never get called anyway.
random_sources_feed won't call their associated functions and push into
random_harvest_direct. But if the bit isn't set, then you're harvesting entropy
and throwing it away.

If you have a more elegant solution, I am open. A couple of us noodled on this
and we are running it in various places in development and production at this
point and it works. That doesn't mean it can't be better though.

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