linux-ext4 - Re: [PATCH RFC v2] random: optionally block in getrandom(2) when the CRNG is uninitialized

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Date:   Sun, 15 Sep 2019 20:36:59 +0200
From:   Willy Tarreau <w@....eu>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     "Theodore Y. Ts'o" <tytso@....edu>,
        "Alexander E. Patrakov" <patrakov@...il.com>,
        "Ahmed S. Darwish" <darwish.07@...il.com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Jan Kara <jack@...e.cz>, Ray Strode <rstrode@...hat.com>,
        William Jon McCann <mccann@....edu>,
        zhangjs <zachary@...shancloud.com>, linux-ext4@...r.kernel.org,
        lkml <linux-kernel@...r.kernel.org>,
        Lennart Poettering <mzxreary@...inter.de>
Subject: Re: [PATCH RFC v2] random: optionally block in getrandom(2) when the
 CRNG is uninitialized

I also wanted to ask, are we going to enforce the same strategy on
/dev/urandom ? If we don't because we fear application breakage or
whatever, then there will always be some incentive against migrating
to getrandom(). And if we do it, we know we have to take a reasonable
approach making the change transparent enough for applications. That
would too go in favor of a short timeout.

Willy