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Re: [PATCH 05/16] efi: Add EFI_SECURE_BOOT bit

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On 16 November 2016 at 21:47, David Howells <dhowells@redhat.com> wrote:
> From: Josh Boyer <jwboyer@fedoraproject.org>
>
> UEFI machines can be booted in Secure Boot mode.  Add a EFI_SECURE_BOOT bit
> for use with efi_enabled.
>
> Signed-off-by: Josh Boyer <jwboyer@fedoraproject.org>
> Signed-off-by: David Howells <dhowells@redhat.com>
> ---
>
>  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 9521acce8378..539f29587712 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -1164,6 +1164,7 @@ void __init setup_arch(char **cmdline_p)
>         if (boot_params.secure_boot &&
>             IS_ENABLED(CONFIG_EFI_SECURE_BOOT_LOCK_DOWN)) {
>                 lock_kernel_down();
> +               set_bit(EFI_SECURE_BOOT, &efi.flags);

Why is this x86 only? And why is this bit only set if
CONFIG_EFI_SECURE_BOOT_LOCK_DOWN is enabled?

>                 pr_info("Secure boot enabled\n");
>         }
>
> diff --git a/include/linux/efi.h b/include/linux/efi.h
> index 11372fb8784c..5d7fb3e3400b 100644
> --- a/include/linux/efi.h
> +++ b/include/linux/efi.h
> @@ -1079,6 +1079,7 @@ 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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[PATCH 00/16] Kernel lockdown David Howells <dhowells@redhat.com> - 2016-11-16 22:50 +0100
  [PATCH 15/16] acpi: Ignore acpi_rsdp kernel param when the kernel  has been locked down David Howells <dhowells@redhat.com> - 2016-11-16 22:50 +0100
  [PATCH 05/16] efi: Add EFI_SECURE_BOOT bit David Howells <dhowells@redhat.com> - 2016-11-16 22:50 +0100
    Re: [PATCH 05/16] efi: Add EFI_SECURE_BOOT bit Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2016-11-17 23:00 +0100
      Re: [PATCH 05/16] efi: Add EFI_SECURE_BOOT bit Josh Boyer <jwboyer@fedoraproject.org> - 2016-11-18 13:00 +0100
        Re: [PATCH 05/16] efi: Add EFI_SECURE_BOOT bit Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2016-11-18 13:20 +0100
      Re: [PATCH 05/16] efi: Add EFI_SECURE_BOOT bit David Howells <dhowells@redhat.com> - 2016-11-18 18:30 +0100
  [PATCH 07/16] kexec: Disable at runtime if the kernel is locked down David Howells <dhowells@redhat.com> - 2016-11-16 22:50 +0100
  [PATCH 08/16] Copy secure_boot flag in boot params across kexec  reboot David Howells <dhowells@redhat.com> - 2016-11-16 22:50 +0100
  [PATCH 12/16] ACPI: Limit access to custom_method when the kernel  is locked down David Howells <dhowells@redhat.com> - 2016-11-16 22:50 +0100
  [PATCH 03/16] efi: Disable secure boot if shim is in insecure mode David Howells <dhowells@redhat.com> - 2016-11-16 23:00 +0100
  [PATCH 04/16] efi: Lock down the kernel if booted in secure boot  mode David Howells <dhowells@redhat.com> - 2016-11-16 23:00 +0100
  [PATCH 11/16] x86: Lock down IO port access when the kernel is  locked down David Howells <dhowells@redhat.com> - 2016-11-16 23:00 +0100
  [PATCH 06/16] Add a sysrq option to exit secure boot mode David Howells <dhowells@redhat.com> - 2016-11-16 23:00 +0100
  Re: [PATCH 00/16] Kernel lockdown One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-11-16 23:30 +0100
    Re: [PATCH 00/16] Kernel lockdown Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2016-11-21 21:00 +0100
  Re: [PATCH 00/16] Kernel lockdown Justin Forbes <jmforbes@linuxtx.org> - 2016-11-16 23:30 +0100
  Re: [PATCH] Lock down drivers that can have io ports, io mem, irqs  and dma changed Dominik Brodowski <linux@dominikbrodowski.net> - 2016-11-22 07:30 +0100
    Re: [PATCH] Lock down drivers that can have io ports, io mem, irqs and dma changed David Howells <dhowells@redhat.com> - 2016-11-23 14:00 +0100
      Re: [PATCH] Lock down drivers that can have io ports, io mem, irqs  and dma changed Dominik Brodowski <linux@dominikbrodowski.net> - 2016-11-23 20:30 +0100
        Re: [PATCH] Lock down drivers that can have io ports, io mem, irqs and dma changed David Howells <dhowells@redhat.com> - 2016-11-24 18:40 +0100
          Re: [PATCH] Lock down drivers that can have io ports, io mem, irqs  and dma changed Dominik Brodowski <linux@dominikbrodowski.net> - 2016-11-24 21:30 +0100

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