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

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Date:   Thu, 31 Oct 2019 14:47:53 +0100
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Bhupesh Sharma <bhsharma@...hat.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        linux-efi <linux-efi@...r.kernel.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 Thu, 31 Oct 2019 at 09:41, Ingo Molnar <mingo@...nel.org> wrote:
>
>
> * Ard Biesheuvel <ard.biesheuvel@...aro.org> wrote:
>
> > 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
>
> I've added Bhupesh's Tested-by to the commit - no need to resend.
>
> I've picked up all 6 EFI fixes, will push them out after a bit of testing
> - sorry about the delay!
>

No worries, thanks for picking them up.