[PATCH 2/5] efi: Add EFI_SECURE_BOOT bit

From	David Howells <dhowells@redhat.com>
Newsgroups	linux.kernel
Subject	[PATCH 2/5] efi: Add EFI_SECURE_BOOT bit
Date	2017-04-06 15:00 +0200
Message-ID	<ttfb5-cf-33@gated-at.bofh.it> (permalink)
References	<ttfb4-cf-3@gated-at.bofh.it>
Organization	Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903

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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>
cc: linux-efi@vger.kernel.org
---

 drivers/firmware/efi/secure_boot.c |    1 +
 include/linux/efi.h                |    1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/firmware/efi/secure_boot.c b/drivers/firmware/efi/secure_boot.c
index cf5bccae15e8..730518061a14 100644
--- a/drivers/firmware/efi/secure_boot.c
+++ b/drivers/firmware/efi/secure_boot.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 d8938a780290..536a10111bde 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
 /*

Thread

[PATCH 1/5] efi: Move the x86 secure boot switch to generic code David Howells <dhowells@redhat.com> - 2017-04-06 15:00 +0200
  Re: [PATCH 1/5] efi: Move the x86 secure boot switch to generic code David Howells <dhowells@redhat.com> - 2017-04-06 15:00 +0200
  [PATCH 2/5] efi: Add EFI_SECURE_BOOT bit David Howells <dhowells@redhat.com> - 2017-04-06 15:00 +0200
  [PATCH 3/5] Add the ability to lock down access to the running  kernel image David Howells <dhowells@redhat.com> - 2017-04-06 15:00 +0200
    Re: [PATCH 3/5] Add the ability to lock down access to the running  kernel image James Morris <jmorris@namei.org> - 2017-04-07 00:50 +0200

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