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From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Tue, 17 Sep 2019 16:08:08 -0700
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Subject: Re: Linux 5.3-rc8
To:     Matthew Garrett <mjg59@srcf.ucam.org>
Cc:     Martin Steigerwald <martin@lichtvoll.de>,
        "Ahmed S. Darwish" <darwish.07@gmail.com>,
        Lennart Poettering <mzxreary@0pointer.de>,
        "Theodore Y. Ts'o" <tytso@mit.edu>, Willy Tarreau <w@1wt.eu>,
        Vito Caputo <vcaputo@pengaru.com>,
        Andreas Dilger <adilger.kernel@dilger.ca>,
        Jan Kara <jack@suse.cz>, Ray Strode <rstrode@redhat.com>,
        William Jon McCann <mccann@jhu.edu>,
        "Alexander E. Patrakov" <patrakov@gmail.com>,
        zhangjs <zachary@baishancloud.com>, linux-ext4@vger.kernel.org,
        lkml <linux-kernel@vger.kernel.org>
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On Tue, Sep 17, 2019 at 2:52 PM Matthew Garrett <mjg59@srcf.ucam.org> wrote:
>
> getrandom() will never "consume entropy" in a way that will block any
> users of getrandom().

Yes, this is true for any common and sane use.

And by that I just mean that we do have GRND_RANDOM, which currently
does exactly that entropy consumption.

But it only consumes it for other GRND_RANDOM users - of which there
are approximately zero, because nobody wants that rats nest.

                Linus