linux-kernel - Re: [PATCH] dt-bindings: chosen: document rng-seed property

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Date:   Tue, 28 Jun 2022 11:39:38 +0800
From:   Hsin-Yi Wang <hsinyi@...omium.org>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     krzysztof.kozlowski@...aro.org, robh@...nel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jonathan Neuschäfer <j.neuschaefer@....net>,
        Kees Cook <keescook@...omium.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: [PATCH] dt-bindings: chosen: document rng-seed property

On Mon, Jun 27, 2022 at 11:21 PM Jason A. Donenfeld <Jason@...c4.com> wrote:
>
> Document the /chosen/rng-seed property, which has existed for quite some
> time but without an entry in this file.
>
> Fixes: 428826f5358c ("fdt: add support for rng-seed")
> Cc: Hsin-Yi Wang <hsinyi@...omium.org>
> Cc: Kees Cook <keescook@...omium.org>
> Cc: Rob Herring <robh@...nel.org>
> Cc: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
> ---
It's currently documented in
https://github.com/devicetree-org/dt-schema/blob/main/dtschema/schemas/chosen.yaml

https://lore.kernel.org/lkml/CAL_Jsq+uSdk9YNbUW35yjN3q8-3FDobrxHmBpy=4RKmCfnB0KQ@mail.gmail.com/


>  Documentation/devicetree/bindings/chosen.txt | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/chosen.txt b/Documentation/devicetree/bindings/chosen.txt
> index 1cc3aa10dcb1..49b175e133b2 100644
> --- a/Documentation/devicetree/bindings/chosen.txt
> +++ b/Documentation/devicetree/bindings/chosen.txt
> @@ -7,6 +7,21 @@ arguments. Data in the chosen node does not represent the hardware.
>
>  The following properties are recognized:
>
> +rng-seed
> +--------
> +
> +This property is used to initialize the kernel's random number generator at
> +the earliest possible opportunity, and will be credited if CONFIG_RANDOM_
> +TRUST_BOOTLOADER is set. All hardware that has an opportunity to set this
> +with high quality randomness is encouraged to do so. It is parsed as a byte
> +array, which should be at least 32 bytes long:
> +
> +/ {
> +       chosen {
> +               rng-seed = <... random bytes ...>;
> +       };
> +};
> +
>
>  kaslr-seed
>  -----------
> --
> 2.35.1
>