linux-kernel - Re: 4.14 "random: add a config option to trust the CPU's hwrng"

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Message-ID: <20190206192613.GB4119@sasha-vm>
Date:   Wed, 6 Feb 2019 14:26:13 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     "Rantala, Tommi T. (Nokia - FI/Espoo)" <tommi.t.rantala@...ia.com>
Cc:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "keescook@...omium.org" <keescook@...omium.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "tytso@....edu" <tytso@....edu>
Subject: Re: 4.14 "random: add a config option to trust the CPU's hwrng"

On Wed, Feb 06, 2019 at 11:44:36AM +0000, Rantala, Tommi T. (Nokia - FI/Espoo) wrote:
>Hi stable maintainers,
>
>Can you consider including these "random" patches in 4.14.y?
>
>These are very useful in fixing esp. first-bootup delays of VMs due to
>entropy starvation.
>
>
>commit 39a8883a2b989d1d21bd8dd99f5557f0c5e89694
>Author: Theodore Ts'o <tytso@....edu>
>Date:   Tue Jul 17 18:24:27 2018 -0400
>
>    random: add a config option to trust the CPU's hwrng
>
>commit 9b25436662d5fb4c66eb527ead53cab15f596ee0
>Author: Kees Cook <keescook@...omium.org>
>Date:   Mon Aug 27 14:51:54 2018 -0700
>
>    random: make CPU trust a boot parameter

This really looks like a new feature to me. The "old" behaviour of not
trusting RDRAND-like randomness was by-design rather than an oversight.

--
Thanks,
Sasha