linux-kernel - Re: [PATCH v2 3/6] efi/random: treat EFI_RNG_PROTOCOL output as bootloader randomness

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Message-ID: <CAKv+Gu_zMMeRSBYk_tBX4UA+v1r+Kntrxe3xurLd1Q2_+HkbWw@mail.gmail.com>
Date:   Thu, 31 Oct 2019 09:24:29 +0100
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     Bhupesh Sharma <bhsharma@...hat.com>
Cc:     Ard Biesheuvel <ardb@...nel.org>,
        linux-efi <linux-efi@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/6] efi/random: treat EFI_RNG_PROTOCOL output as
 bootloader randomness

On Tue, 29 Oct 2019 at 20:14, Bhupesh Sharma <bhsharma@...hat.com> wrote:
>
> Hi Ard,
>
> On Tue, Oct 29, 2019 at 11:10 PM Ard Biesheuvel <ardb@...nel.org> wrote:
> >
> > From: Dominik Brodowski <linux@...inikbrodowski.net>
> >
> > Commit 428826f5358c ("fdt: add support for rng-seed") introduced
> > add_bootloader_randomness(), permitting randomness provided by the
> > bootloader or firmware to be credited as entropy. However, the fact
> > that the UEFI support code was already wired into the RNG subsystem
> > via a call to add_device_randomness() was overlooked, and so it was
> > not converted at the same time.
> >
> > Note that this UEFI (v2.4 or newer) feature is currently only
> > implemented for EFI stub booting on ARM, and further note that
> > CONFIG_RANDOM_TRUST_BOOTLOADER must be enabled, and this should be
> > done only if there indeed is sufficient trust in the bootloader
> > _and_ its source of randomness.
> >
> > Signed-off-by: Dominik Brodowski <linux@...inikbrodowski.net>
> > [ardb: update commit log]
> > Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
>
> Seems my Tested-by was dropped which I provide for the RFC version of
> this patch.
> See <https://www.mail-archive.com/linux-efi@vger.kernel.org/msg12281.html>
> for details.
>
> I can provide a similar Tested-by for this version as well.
>

Thanks Bhupesh