linux-kernel - Re: [PATCH] random: allow writes to /dev/urandom to influence fast init

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Date:   Thu, 24 Mar 2022 18:26:56 +0000
From:   Eric Biggers <ebiggers@...nel.org>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     "Alex Xu (Hello71)" <alex_y_xu@...oo.ca>,
        Jann Horn <jannh@...gle.com>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Guenter Roeck <linux@...ck-us.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Theodore Ts'o <tytso@....edu>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] random: allow writes to /dev/urandom to influence fast
 init

On Wed, Mar 23, 2022 at 09:18:16PM -0600, Jason A. Donenfeld wrote:
> In light of that conclusion, I'm going to work with every userspace
> downstream I can find to help them fix their file-based seeding, if it
> has bugs. I've started talking with the buildroot folks, and then I'll
> speak with the OpenRC people (being a Gentoo dev, that should be easy
> going). Systemd does the right thing already.
> 
> I wrote a little utility for potential inclusion in
> busybox/util-linux/whatever when it matures beyond its current age of
> being half hour old:
> - https://git.zx2c4.com/seedrng/about/
> - https://git.zx2c4.com/seedrng/tree/seedrng.c
> So I'll see what the buildroot people think of this and take it from there.
> 

The example in random(4) needs to be fixed too, right?

https://man7.org/linux/man-pages/man4/random.4.html

- Eric