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dt-bindings: chosen: document kaslr-seed property
Document the /chosen/kaslr-seed property (and its interaction with the EFI_RNG_PROTOCOL API). Thanks to Ard for clarifications. Signed-off-by: Kees Cook <keescook@chromium.org> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Rob Herring <robh@kernel.org>
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@ -5,9 +5,31 @@ The chosen node does not represent a real device, but serves as a place
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for passing data between firmware and the operating system, like boot
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arguments. Data in the chosen node does not represent the hardware.
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The following properties are recognized:
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stdout-path property
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--------------------
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kaslr-seed
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-----------
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This property is used when booting with CONFIG_RANDOMIZE_BASE as the
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entropy used to randomize the kernel image base address location. Since
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it is used directly, this value is intended only for KASLR, and should
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not be used for other purposes (as it may leak information about KASLR
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offsets). It is parsed as a u64 value, e.g.
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/ {
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chosen {
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kaslr-seed = <0xfeedbeef 0xc0def00d>;
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};
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};
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Note that if this property is set from UEFI (or a bootloader in EFI
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mode) when EFI_RNG_PROTOCOL is supported, it will be overwritten by
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the Linux EFI stub (which will populate the property itself, using
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EFI_RNG_PROTOCOL).
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stdout-path
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-----------
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Device trees may specify the device to be used for boot console output
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with a stdout-path property under /chosen, as described in the Devicetree
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