linux-kernel - Re: [PATCH 2/5] efi: Add EFI_SECURE

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Date:   Fri, 26 May 2017 16:06:45 +0800
From:   joeyli <jlee@...e.com>
To:     David Howells <dhowells@...hat.com>
Cc:     ard.biesheuvel@...aro.org, matthew.garrett@...ula.com,
        linux-security-module@...r.kernel.org, linux-efi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] efi: Add EFI_SECURE_BOOT bit

On Wed, May 24, 2017 at 03:45:32PM +0100, David Howells wrote:
> From: Josh Boyer <jwboyer@...oraproject.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@...oraproject.org>
> Signed-off-by: David Howells <dhowells@...hat.com>
> cc: linux-efi@...r.kernel.org

Reviewed-by: Joey Lee <jlee@...e.com>

Regards
Joey Lee

> ---
> 
>  drivers/firmware/efi/secureboot.c |    1 +
>  include/linux/efi.h               |    1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/drivers/firmware/efi/secureboot.c b/drivers/firmware/efi/secureboot.c
> index cf5bccae15e8..730518061a14 100644
> --- a/drivers/firmware/efi/secureboot.c
> +++ b/drivers/firmware/efi/secureboot.c
> @@ -24,6 +24,7 @@ void __init efi_set_secure_boot(enum efi_secureboot_mode mode)
>  			pr_info("Secure boot disabled\n");
>  			break;
>  		case efi_secureboot_mode_enabled:
> +			set_bit(EFI_SECURE_BOOT, &efi.flags);
>  			pr_info("Secure boot enabled\n");
>  			break;
>  		default:
> diff --git a/include/linux/efi.h b/include/linux/efi.h
> index e2f53edccf15..5e9a2d7df089 100644
> --- a/include/linux/efi.h
> +++ b/include/linux/efi.h
> @@ -1081,6 +1081,7 @@ extern int __init efi_setup_pcdp_console(char *);
>  #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_MEM_ATTR		10	/* Did firmware publish an EFI_MEMORY_ATTRIBUTES table? */
> +#define EFI_SECURE_BOOT		11	/* Are we in Secure Boot mode? */
>  
>  #ifdef CONFIG_EFI
>  /*
> 
> --
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