linux-kernel - Re: [PATCH] random: fix locking for crng_init in crng

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Date:   Wed, 9 Feb 2022 22:39:17 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Dominik Brodowski <linux@...inikbrodowski.net>
Cc:     "Theodore Ts'o" <tytso@....edu>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>
Subject: Re: [PATCH] random: fix locking for crng_init in crng_reseed()

Hi Dominik,

Thanks, applied. I changed complete_init to finalize_init, to match
our naming scheme from earlier, and I moved
invalidate_batched_entropy() to outside the lock and after
crng_init=2, since now it uses atomics, and it should probably be
ordered after crng_init = 2, so the new batch gets the new entropy.

Actually, though, come to think of it: shouldn't we always call
invalidate_batched_entropy() after reseeding? More generally, we can
instead probably tie the entropy generation counter to the base_crng
counter, and have this all done automatically. That might be something
interesting to do in the future.

Jason