hi Simon,
On Sun, 16 Jul 2023 at 05:12, Simon Glass sjg@chromium.org wrote:
Hi Sughosh,
On Sat, 15 Jul 2023 at 07:46, Sughosh Ganu sughosh.ganu@linaro.org wrote:
The EFI capsule authentication logic in u-boot expects the public key in the form of an EFI Signature List(ESL) to be provided as part of the platform's dtb. Currently, the embedding of the ESL file into the dtb needs to be done manually.
Add a signature node in the u-boot dtsi file and include the public key through the capsule-key property. This file is per architecture, and is currently being added for sandbox and arm architectures. It will have to be added for other architectures which need to enable capsule authentication support.
The path to the ESL file is specified through the CONFIG_EFI_CAPSULE_ESL_FILE symbol.
Signed-off-by: Sughosh Ganu sughosh.ganu@linaro.org
Changes since V3:
- Put the two ifdef statements together in arm architecture's u-boot.dtsi file.
- Remove the extra blank line in the Kconfig.
arch/arm/dts/u-boot.dtsi | 17 +++++++++++++++++ arch/sandbox/dts/u-boot.dtsi | 17 +++++++++++++++++ lib/efi_loader/Kconfig | 10 ++++++++++ lib/efi_loader/Makefile | 7 +++++++ 4 files changed, 51 insertions(+) create mode 100644 arch/arm/dts/u-boot.dtsi create mode 100644 arch/sandbox/dts/u-boot.dtsi
This approach seems OK to me for now. It is a bit strange to specify a CONFIG option to add something to the DT, but we can always adjust it later if needed.
diff --git a/arch/arm/dts/u-boot.dtsi b/arch/arm/dts/u-boot.dtsi new file mode 100644 index 0000000000..2a9359c43c --- /dev/null +++ b/arch/arm/dts/u-boot.dtsi @@ -0,0 +1,17 @@ +// SPDX-License-Identifier: GPL-2.0+ +/*
/**
for multi-line comments
Okay
- Devicetree file with miscellaneous nodes that will be included
- at build time into the DTB. Currently being used for including
- capsule related information.
drop blank line
Okay
- */
+#ifdef CONFIG_EFI_HAVE_CAPSULE_SUPPORT +#ifdef CONFIG_EFI_CAPSULE_AUTHENTICATE
Can you combine these, or can you omit the first one?
I will drop the first line. Should build for all platforms I believe.
+/ {
signature {capsule-key = /incbin/(CONFIG_EFI_CAPSULE_ESL_FILE);};+}; +#endif /* CONFIG_EFI_CAPSULE_AUTHENTICATE */ +#endif /* CONFIG_EFI_HAVE_CAPSULE_SUPPORT */ diff --git a/arch/sandbox/dts/u-boot.dtsi b/arch/sandbox/dts/u-boot.dtsi new file mode 100644 index 0000000000..60bd004937 --- /dev/null +++ b/arch/sandbox/dts/u-boot.dtsi @@ -0,0 +1,17 @@ +// SPDX-License-Identifier: GPL-2.0+ +/*
- Devicetree file with miscellaneous nodes that will be included
- at build time into the DTB. Currently being used for including
- capsule related information.
- */
+#ifdef CONFIG_EFI_HAVE_CAPSULE_SUPPORT +/ { +#ifdef CONFIG_EFI_CAPSULE_AUTHENTICATE
signature {capsule-key = /incbin/(CONFIG_EFI_CAPSULE_ESL_FILE);};+#endif +}; +#endif /* CONFIG_EFI_HAVE_CAPSULE_SUPPORT */ diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig index a22e47616f..9abb9a4db3 100644 --- a/lib/efi_loader/Kconfig +++ b/lib/efi_loader/Kconfig @@ -235,6 +235,16 @@ config EFI_CAPSULE_MAX Select the max capsule index value used for capsule report variables. This value is used to create CapsuleMax variable.
+config EFI_CAPSULE_ESL_FILE
string "Path to the EFI Signature List File"default ""depends on EFI_CAPSULE_AUTHENTICATEhelpProvides the absolute path to the EFI Signature Listfile which will be embedded in the platform's devicetree and used for capsule authentication at the timeof capsule update.Can you wrap to 72 chars or so?
Okay
-sughosh
config EFI_DEVICE_PATH_TO_TEXT bool "Device path to text protocol" default y diff --git a/lib/efi_loader/Makefile b/lib/efi_loader/Makefile index 1a8c8d7cab..c52c9d27bd 100644 --- a/lib/efi_loader/Makefile +++ b/lib/efi_loader/Makefile @@ -89,3 +89,10 @@ obj-$(CONFIG_EFI_ECPT) += efi_conformance.o
EFI_VAR_SEED_FILE := $(subst $",,$(CONFIG_EFI_VAR_SEED_FILE)) $(obj)/efi_var_seed.o: $(srctree)/$(EFI_VAR_SEED_FILE)
+ifeq ($(CONFIG_EFI_CAPSULE_AUTHENTICATE),y) +EFI_CAPSULE_KEY_PATH := $(subst $",,$(CONFIG_EFI_CAPSULE_ESL_FILE)) +ifeq ("$(wildcard $(EFI_CAPSULE_KEY_PATH))","") +$(error .esl cerificate not found. Configure your CONFIG_EFI_CAPSULE_ESL_FILE) +endif
+endif
2.34.1
REgards, Simon