linux-kernel - Re: Linux 5.3-rc8

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Message-ID: <CAHk-=wgO81JZJSvmyeUwW7YOk=14YyOnu0TFDygo=jy3D_r6UQ@mail.gmail.com>
Date:   Tue, 17 Sep 2019 16:08:08 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Matthew Garrett <mjg59@...f.ucam.org>
Cc:     Martin Steigerwald <martin@...htvoll.de>,
        "Ahmed S. Darwish" <darwish.07@...il.com>,
        Lennart Poettering <mzxreary@...inter.de>,
        "Theodore Y. Ts'o" <tytso@....edu>, Willy Tarreau <w@....eu>,
        Vito Caputo <vcaputo@...garu.com>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Jan Kara <jack@...e.cz>, Ray Strode <rstrode@...hat.com>,
        William Jon McCann <mccann@....edu>,
        "Alexander E. Patrakov" <patrakov@...il.com>,
        zhangjs <zachary@...shancloud.com>, linux-ext4@...r.kernel.org,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: Linux 5.3-rc8

On Tue, Sep 17, 2019 at 2:52 PM Matthew Garrett <mjg59@...f.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