Here's a set of patches that can determine the secure boot state of the
UEFI BIOS and pass that along to the main kernel image. This involves
generalising ARM's efi_get_secureboot() function and making it mixed-mode
safe.
Changes:
Ver 4:
- Use an enum to tell the kernel whether secure boot mode is enabled,
disabled, couldn't be determined or wasn't even tried due to not being
in EFI mode.
- Support the UEFI-2.6 DeployedMode flag.
- Don't clear boot_params->secure_boot in x86 sanitize_boot_params().
- Preclear the boot_params->secure_boot on x86 head_*.S entry if we may
not go through efi_main().
The patches can be found here also:
http://git.kernel.org/cgit/linux/kernel/git/dhowells/linux-fs.git/log/?h=efi-secure-boot
at tag:
efi-secure-boot-20161207
Note that the patches are not terminal on the branch.
David
---
Ard Biesheuvel (1):
efi: use typed function pointers for runtime services table
David Howells (5):
x86/efi: Allow invocation of arbitrary runtime services
arm/efi: Allow invocation of arbitrary runtime services
efi: Add SHIM and image security database GUID definitions
efi: Get the secure boot status
efi: Handle secure boot from UEFI-2.6
Josh Boyer (2):
efi: Disable secure boot if shim is in insecure mode
efi: Add EFI_SECURE_BOOT bit
Documentation/x86/zero-page.txt | 2 +
arch/arm/include/asm/efi.h | 1
arch/arm64/include/asm/efi.h | 1
arch/x86/boot/compressed/eboot.c | 3 +
arch/x86/boot/compressed/head_32.S | 7 +-
arch/x86/boot/compressed/head_64.S | 9 +--
arch/x86/include/asm/bootparam_utils.h | 5 +
arch/x86/include/asm/efi.h | 5 +
arch/x86/include/uapi/asm/bootparam.h | 3 +
arch/x86/kernel/asm-offsets.c | 1
arch/x86/kernel/setup.c | 15 ++++
drivers/firmware/efi/libstub/Makefile | 2 -
drivers/firmware/efi/libstub/arm-stub.c | 58 +---------------
drivers/firmware/efi/libstub/secureboot.c | 102 +++++++++++++++++++++++++++++
include/linux/efi.h | 52 ++++++++++-----
15 files changed, 182 insertions(+), 84 deletions(-)
create mode 100644 drivers/firmware/efi/libstub/secureboot.c
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