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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 7/7] efi: Add EFI_SECURE_BOOT bit [ver #3] From: David Howells To: lukas@wunner.de Date: Wed, 23 Nov 2016 12:54:25 +0000 Message-ID: <147990566529.7576.3473031193517498415.stgit@warthog.procyon.org.uk> In-Reply-To: <147990561294.7576.6464430479448167484.stgit@warthog.procyon.org.uk> References: <147990561294.7576.6464430479448167484.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.68 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Wed, 23 Nov 2016 12:54:27 +0000 (UTC) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20161123_045447_436018_010B9C8B X-CRM114-Status: GOOD ( 17.24 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, dhowells@redhat.com, linux-security-module@vger.kernel.org, keyrings@vger.kernel.org, Josh Boyer , linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP 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 | 5 +++++ include/linux/efi.h | 1 + 2 files changed, 6 insertions(+) diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index 9c337b0e8ba7..aa972b4cb680 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -1160,6 +1160,11 @@ void __init setup_arch(char **cmdline_p) io_delay_init(); + if (IS_ENABLED(CONFIG_EFI) && boot_params.secure_boot) { + set_bit(EFI_SECURE_BOOT, &efi.flags); + pr_info("Secure boot enabled\n"); + } + /* * Parse the ACPI tables for possible boot-time SMP configuration. */ diff --git a/include/linux/efi.h b/include/linux/efi.h index 5d6c60a9caf8..333d31bf55bf 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 /*