linux-kernel - Re: x86/random: Speculation to the rescue

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Message-ID: <20191006120742.GE24605@amd>
Date:   Sun, 6 Oct 2019 14:07:42 +0200
From:   Pavel Machek <pavel@....cz>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     "Ahmed S. Darwish" <darwish.07@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>, a.darwish@...utronix.de,
        LKML <linux-kernel@...r.kernel.org>,
        Theodore Ts'o <tytso@....edu>,
        Nicholas Mc Guire <hofrat@...ntech.at>,
        the arch/x86 maintainers <x86@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Kees Cook <keescook@...omium.org>
Subject: Re: x86/random: Speculation to the rescue

Hi!

> Entropy really is hard. It's hard to generate, and it's hard to measure.

It is not hard to generate... not on PC, not on most machines. "find
/" can generate plenty of entropy... certainly on any PC.

But it does not work everywhere, and we may need other methods of
generating entropy on some very embedded systems... So IMO we shold
have generic driver for PC-like machines and specific drivers for the
embedded stuff that needs it.

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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