linux-kernel - Re: Linux 5.3-rc8

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Message-ID: <20190918134039.GB32346@gardel-login>
Date:   Wed, 18 Sep 2019 15:40:39 +0200
From:   Lennart Poettering <mzxreary@...inter.de>
To:     Martin Steigerwald <martin@...htvoll.de>
Cc:     "Ahmed S. Darwish" <darwish.07@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "Theodore Y. Ts'o" <tytso@....edu>, Willy Tarreau <w@....eu>,
        Matthew Garrett <mjg59@...f.ucam.org>,
        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 Di, 17.09.19 23:38, Martin Steigerwald (martin@...htvoll.de) wrote:

> (I know that it still with /dev/urandom, so if it is using RDRAND now,
> this may indeed be different, but would it then deplete entropy the CPU
> has available and that by default is fed into the Linux crng as well
> (even without trusting it completely)?)

Neither RDRAND nor /dev/urandom know a concept of "depleting
entropy". That concept does not exist for them. It does exist for
/dev/random, but only crazy people use that. systemd does not.

Lennart

--
Lennart Poettering, Berlin