linux-kernel - Re: [PATCH 01/24] efi: Add EFI_SECURE

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Date:   Thu, 6 Apr 2017 09:26:55 +0100
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     David Howells <dhowells@...hat.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
        "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
        Matthew Garrett <matthew.garrett@...ula.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        linux-security-module <linux-security-module@...r.kernel.org>,
        keyrings@...r.kernel.org, Josh Boyer <jwboyer@...oraproject.org>
Subject: Re: [PATCH 01/24] efi: Add EFI_SECURE_BOOT bit

On 5 April 2017 at 21:14, David Howells <dhowells@...hat.com> 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
> ---
>
>  arch/x86/kernel/setup.c |    1 +
>  include/linux/efi.h     |    1 +
>  2 files changed, 2 insertions(+)
>
> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> index 4bf0c8926a1c..396285bddb93 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -1184,6 +1184,7 @@ void __init setup_arch(char **cmdline_p)
>                         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:

Like I asked when this patch was sent round the last time: is there
any reason for this not to live in generic code?


> diff --git a/include/linux/efi.h b/include/linux/efi.h
> index 94d34e0be24f..6049600e5475 100644
> --- a/include/linux/efi.h
> +++ b/include/linux/efi.h
> @@ -1069,6 +1069,7 @@ 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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