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Date:   Thu, 15 Aug 2019 11:12:24 -0400
From:   "Theodore Y. Ts'o" <tytso@mit.edu>
To:     Pavel Machek <pavel@ucw.cz>
Cc:     "Lendacky, Thomas" <Thomas.Lendacky@amd.com>,
        nhorman@tuxdriver.com,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
        "linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
        "x86@kernel.org" <x86@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        "Rafael J . Wysocki" <rjw@rjwysocki.net>,
        Chen Yu <yu.c.chen@intel.com>, Jonathan Corbet <corbet@lwn.net>
Subject: Re: Non-random RDRAND Re: [PATCH] x86/CPU/AMD: Clear RDRAND CPUID
 bit on AMD family 15h/16h
Message-ID: <20190815151224.GB18727@mit.edu>
Mail-Followup-To: "Theodore Y. Ts'o" <tytso@mit.edu>,
        Pavel Machek <pavel@ucw.cz>,
        "Lendacky, Thomas" <Thomas.Lendacky@amd.com>, nhorman@tuxdriver.com,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
        "linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
        "x86@kernel.org" <x86@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        "Rafael J . Wysocki" <rjw@rjwysocki.net>,
        Chen Yu <yu.c.chen@intel.com>, Jonathan Corbet <corbet@lwn.net>
References: <776cb5c2d33e7fd0d2893904724c0e52b394f24a.1565817448.git.thomas.lendacky@amd.com>
 <20190814232434.GA31769@amd>
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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