linux-kernel - Re: [RFC PATCH v12 3/4] Linux Random Number Generator

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Message-ID: <1660806.HVQ9M7P8eN@positron.chronox.de>
Date:   Wed, 19 Jul 2017 08:25:55 +0200
From:   Stephan Müller <smueller@...onox.de>
To:     Theodore Ts'o <tytso@....edu>
Cc:     Sandy Harris <sandyinchina@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Jason A. Donenfeld" <jason@...c4.com>,
        Arnd Bergmann <arnd@...db.de>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v12 3/4] Linux Random Number Generator

Am Mittwoch, 19. Juli 2017, 03:51:33 CEST schrieb Theodore Ts'o:

Hi Theodore,

> If the real unpredictability is really coming from the interrupts
> changing the state of the CPU microarchitecture, the real question is
> how many interrupts do you need before you consider things
> "unpredictable" to an adequate level of security?  Arguing that we
> should turn down the "interrupts per bit of entropy" in
> drivers/char/random.c is a much more honest way of having that
> discussion.

Please answer on the concerns given in [1] which explains that we cannot allow 
turning that knob in the current implementation.

[1] https://www.spinics.net/lists/linux-crypto/msg26316.html

Ciao
Stephan