linux-kernel - Re: Non-random RDRAND Re: [PATCH] x86/CPU/AMD: Clear RDRAND CPUID bit on AMD family 15h/16h

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Message-ID: <20190815151224.GB18727@mit.edu>
Date:   Thu, 15 Aug 2019 11:12:24 -0400
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Pavel Machek <pavel@....cz>
Cc:     "Lendacky, Thomas" <Thomas.Lendacky@....com>,
        nhorman@...driver.com,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Chen Yu <yu.c.chen@...el.com>, Jonathan Corbet <corbet@....net>
Subject: Re: Non-random RDRAND Re: [PATCH] x86/CPU/AMD: Clear RDRAND CPUID
 bit on AMD family 15h/16h

On Thu, Aug 15, 2019 at 01:24:35AM +0200, Pavel Machek wrote:
> Burn it with fire!
> 
> I mean... people were afraid RDRAND would be backdoored, and you now
> confirm ... it indeed _is_ backdoored? /., here's news for you!

To be fair to AMD, I wouldn't call it a backdoor.  Hanlon's razor is
applicable here:

	"Never attribute to malice that which can be adequately
	explained by neglect."

(Sometimes other words are used instead of neglect, but i'm trying to
be nice.)

					- Ted

P.S.   Also applicable:

	https://www.youtube.com/watch?v=XZxzJGgox_E