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

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Date:   Wed, 30 Oct 2019 00:44:14 +0530
From:   Bhupesh Sharma <bhsharma@...hat.com>
To:     Ard Biesheuvel <ardb@...nel.org>
Cc:     linux-efi@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        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

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


> ---
>  drivers/firmware/efi/efi.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
> index 69f00f7453a3..e98bbf8e56d9 100644
> --- a/drivers/firmware/efi/efi.c
> +++ b/drivers/firmware/efi/efi.c
> @@ -554,7 +554,7 @@ int __init efi_config_parse_tables(void *config_tables, int count, int sz,
>                                               sizeof(*seed) + size);
>                         if (seed != NULL) {
>                                 pr_notice("seeding entropy pool\n");
> -                               add_device_randomness(seed->bits, seed->size);
> +                               add_bootloader_randomness(seed->bits, seed->size);
>                                 early_memunmap(seed, sizeof(*seed) + size);
>                         } else {
>                                 pr_err("Could not map UEFI random seed!\n");
> --
> 2.17.1
>