Messages in this thread Patch in this message | | | Date | Fri, 14 Jul 2017 17:38:36 -0700 | From | Kees Cook <> | Subject | [PATCH] Documentation: dt: chosen property for kaslr-seed |
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Document then /chosen/kaslr-seed property (and its interaction with the EFI_RNG_PROTOCOL API).
Signed-off-by: Kees Cook <keescook@chromium.org> --- Documentation/devicetree/bindings/chosen.txt | 22 ++++++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-)
diff --git a/Documentation/devicetree/bindings/chosen.txt b/Documentation/devicetree/bindings/chosen.txt index dee3f5d9df26..0cdb43b268e5 100644 --- a/Documentation/devicetree/bindings/chosen.txt +++ b/Documentation/devicetree/bindings/chosen.txt @@ -5,9 +5,27 @@ 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 to seed +the entropy used to randomize the kernel image base address location. It +is parsed as a u64 value, e.g. + +/ { + chosen { + kaslr-seed = <0xfeedbeef 0xc0def00d>; + }; +}; + +Note that when booting through EFI when EFI_RNG_PROTOCOL is supported, +this value will be overwritten by the EFI stub. + +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 -- 2.7.4
-- Kees Cook Pixel Security
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