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dt-bindings: chosen: document kaslr-seed property

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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>
This commit is contained in:
Kees Cook 2017-07-17 15:05:11 -07:00 committed by Rob Herring
parent e2af1f5611
commit e5bc0c37c9
1 changed files with 24 additions and 2 deletions
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26
Documentation/devicetree/bindings/chosen.txt
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@ -5,9 +5,31 @@ The chosen node does not represent a real device, but serves as a place
for passing data between firmware and the operating system, like boot
arguments. Data in the chosen node does not represent the hardware.
The following properties are recognized:
stdout-path property
--------------------
kaslr-seed
-----------
This property is used when booting with CONFIG_RANDOMIZE_BASE as the
entropy used to randomize the kernel image base address location. Since
it is used directly, this value is intended only for KASLR, and should
not be used for other purposes (as it may leak information about KASLR
offsets). It is parsed as a u64 value, e.g.
/ {
chosen {
kaslr-seed = <0xfeedbeef 0xc0def00d>;
};
};
Note that if this property is set from UEFI (or a bootloader in EFI
mode) when EFI_RNG_PROTOCOL is supported, it will be overwritten by
the Linux EFI stub (which will populate the property itself, using
EFI_RNG_PROTOCOL).
stdout-path
-----------
Device trees may specify the device to be used for boot console output
with a stdout-path property under /chosen, as described in the Devicetree