linux-kernel - [PATCH 6/6] efi: Add EFI_SECURE

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Date:   Wed, 23 Nov 2016 00:23:12 +0000
From:   David Howells <dhowells@...hat.com>
To:     lukas@...ner.de
Cc:     linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
        dhowells@...hat.com, linux-security-module@...r.kernel.org,
        Josh Boyer <jwboyer@...oraproject.org>,
        keyrings@...r.kernel.org
Subject: [PATCH 6/6] efi: Add EFI_SECURE_BOOT bit [ver #2]

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>
---

 arch/x86/kernel/setup.c |    7 +++++++
 include/linux/efi.h     |    1 +
 2 files changed, 8 insertions(+)

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 9c337b0e8ba7..522915d6de1f 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -1160,6 +1160,13 @@ void __init setup_arch(char **cmdline_p)
 
 	io_delay_init();
 
+#ifdef CONFIG_EFI
+	if (boot_params.secure_boot) {
+		set_bit(EFI_SECURE_BOOT, &efi.flags);
+		pr_info("Secure boot enabled\n");
+	}
+#endif
+
 	/*
 	 * Parse the ACPI tables for possible boot-time SMP configuration.
 	 */
diff --git a/include/linux/efi.h b/include/linux/efi.h
index ff01ad6f2823..d95bb9e69974 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
 /*