Messages in this thread Patch in this message | | | Subject | [PATCH 7/7] efi: Add EFI_SECURE_BOOT bit [ver #3] | From | David Howells <> | Date | Wed, 23 Nov 2016 12:54:25 +0000 |
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From: Josh Boyer <jwboyer@fedoraproject.org>
UEFI machines can be booted in Secure Boot mode. Add a EFI_SECURE_BOOT bit that can be passed to efi_enabled() to find out whether secure boot is enabled.
This will be used by the SysRq+x handler, registered by the x86 arch, to find out whether secure boot mode is enabled so that it can be disabled.
Signed-off-by: Josh Boyer <jwboyer@fedoraproject.org> Signed-off-by: David Howells <dhowells@redhat.com> ---
arch/x86/kernel/setup.c | 5 +++++ include/linux/efi.h | 1 + 2 files changed, 6 insertions(+)
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index 9c337b0e8ba7..aa972b4cb680 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -1160,6 +1160,11 @@ void __init setup_arch(char **cmdline_p) io_delay_init(); + if (IS_ENABLED(CONFIG_EFI) && boot_params.secure_boot) { + set_bit(EFI_SECURE_BOOT, &efi.flags); + pr_info("Secure boot enabled\n"); + } + /* * Parse the ACPI tables for possible boot-time SMP configuration. */ diff --git a/include/linux/efi.h b/include/linux/efi.h index 5d6c60a9caf8..333d31bf55bf 100644 --- a/include/linux/efi.h +++ b/include/linux/efi.h @@ -1066,6 +1066,7 @@ extern int __init efi_setup_pcdp_console(char *); #define EFI_ARCH_1 7 /* First arch-specific bit */ #define EFI_DBG 8 /* Print additional debug info at runtime */ #define EFI_NX_PE_DATA 9 /* Can runtime data regions be mapped non-executable? */ +#define EFI_SECURE_BOOT 10 /* Are we in Secure Boot mode? */ #ifdef CONFIG_EFI /*
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