[Bug 194204] getentropy(2): sys call from openbsd

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194204

--- Comment #8 from Ed Maste <emaste at freebsd.org> ---
(In reply to Mateusz Guzik from comment #5)
> I don't think we should provide a syscall with weaker randomness than one
> provided with original implementation.

I think that's the wrong way to look at it; if we have a weak CSPRNG that needs
to be fixed, regardless of the mechanism by which userland obtains entropy from
kernel.

I believe it is worthwhile for us to add the getentropy syscall, but the
approach we use today (the kern.arandom sysctl) is in practice largely
equivalent.

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