dt-bindings: chosen: document kaslr-seed property
PATCH RESEND v2 1/1 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 <[email protected]>
Acked-by Ard Biesheuvel <[email protected]>
Acked-by Mark Rutland <[email protected]>
Acked-by Will Deacon <[email protected]>
---
v2:
- improved the language a bit based on Ard's notes
- added Acks.
- (resent to include lists)
--- Documentation/devicetree/bindings/chosen.txt | 26 ++++++++++++++++++++++++-- 1 file changed, 24 insertions(+), 2 deletions(-)
Documentation/devicetree/bindings/chosen.txt +24 -2
@@ -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
Signature · 10 lines
2.7.4 -- Kees Cook Pixel Security -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
Quoted 7 lines · Kees Cook
Document the /chosen/kaslr-seed property (and its interaction with the
EFI_RNG_PROTOCOLAPI). Thanks to Ard for clarifications.Signed-off-by Kees Cook <[email protected]>Acked-by Ard Biesheuvel <[email protected]>Acked-by Mark Rutland <[email protected]>Acked-by Will Deacon <[email protected]>
Quoted 8 lines
---
v2:
- improved the language a bit based on Ard's notes
- added Acks.
- (resent to include lists)--- Documentation/devicetree/bindings/chosen.txt | 26 ++++++++++++++++++++++++-- 1 file changed, 24 insertions(+), 2 deletions(-)
Applied, thanks.
Rob
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html