Messages in this thread | | | From | Hsin-Yi Wang <> | Date | Tue, 28 Jun 2022 11:39:38 +0800 | Subject | Re: [PATCH] dt-bindings: chosen: document rng-seed property |
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On Mon, Jun 27, 2022 at 11:21 PM Jason A. Donenfeld <Jason@zx2c4.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@chromium.org> > Cc: Kees Cook <keescook@chromium.org> > Cc: Rob Herring <robh@kernel.org> > Cc: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> > Reported-by: Geert Uytterhoeven <geert@linux-m68k.org> > Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.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 >
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