Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932276AbcLGNTA (ORCPT ); Wed, 7 Dec 2016 08:19:00 -0500 Received: from mx1.redhat.com ([209.132.183.28]:48498 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932177AbcLGNS5 (ORCPT ); Wed, 7 Dec 2016 08:18:57 -0500 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 Subject: [PATCH 7/8] efi: Add EFI_SECURE_BOOT bit [ver #5] From: David Howells To: matt@codeblueprint.co.uk, ard.biesheuvel@linaro.org Cc: linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, dhowells@redhat.com, linux-security-module@vger.kernel.org, keyrings@vger.kernel.org, linux-arm-kernel@lists.infradead.org Date: Wed, 07 Dec 2016 13:18:54 +0000 Message-ID: <148111673487.23390.1034268607109450025.stgit@warthog.procyon.org.uk> In-Reply-To: <148111668193.23390.6340512985876251017.stgit@warthog.procyon.org.uk> References: <148111668193.23390.6340512985876251017.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Wed, 07 Dec 2016 13:18:57 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1792 Lines: 55 From: Josh Boyer 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 Signed-off-by: David Howells --- arch/x86/kernel/setup.c | 15 +++++++++++++++ include/linux/efi.h | 1 + 2 files changed, 16 insertions(+) diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index 9c337b0e8ba7..d8972ec6257d 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -1152,6 +1152,21 @@ void __init setup_arch(char **cmdline_p) /* Allocate bigger log buffer */ setup_log_buf(1); + if (IS_ENABLED(CONFIG_EFI)) { + switch (boot_params.secure_boot) { + case efi_secureboot_mode_disabled: + 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: + pr_info("Secure boot could not be determined\n"); + break; + } + } + reserve_initrd(); acpi_table_upgrade(); diff --git a/include/linux/efi.h b/include/linux/efi.h index 92e23f03045e..135ca9c0c0b5 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 /*