From patchwork Wed Apr 5 20:14:55 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 9665593 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 6A19A60352 for ; Wed, 5 Apr 2017 20:15:08 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5E6D22859F for ; Wed, 5 Apr 2017 20:15:08 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 52F54285A3; Wed, 5 Apr 2017 20:15:08 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F27ED2859F for ; Wed, 5 Apr 2017 20:15:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755992AbdDEUPG (ORCPT ); Wed, 5 Apr 2017 16:15:06 -0400 Received: from mx1.redhat.com ([209.132.183.28]:55544 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755947AbdDEUO7 (ORCPT ); Wed, 5 Apr 2017 16:14:59 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 604FFC00FAC0; Wed, 5 Apr 2017 20:14:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 604FFC00FAC0 Authentication-Results: ext-mx07.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx07.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=dhowells@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com 604FFC00FAC0 Received: from warthog.procyon.org.uk (ovpn-120-211.rdu2.redhat.com [10.10.120.211]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1639682FA0; Wed, 5 Apr 2017 20:14:55 +0000 (UTC) Organization: Red Hat UK Ltd. 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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 03/24] efi: Lock down the kernel if booted in secure boot mode From: David Howells To: linux-kernel@vger.kernel.org Cc: gnomes@lxorguk.ukuu.org.uk, linux-efi@vger.kernel.org, matthew.garrett@nebula.com, gregkh@linuxfoundation.org, dhowells@redhat.com, linux-security-module@vger.kernel.org, keyrings@vger.kernel.org Date: Wed, 05 Apr 2017 21:14:55 +0100 Message-ID: <149142329539.5101.10838131250626684698.stgit@warthog.procyon.org.uk> In-Reply-To: <149142326734.5101.4596394505987813763.stgit@warthog.procyon.org.uk> References: <149142326734.5101.4596394505987813763.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Wed, 05 Apr 2017 20:14:58 +0000 (UTC) Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP UEFI Secure Boot provides a mechanism for ensuring that the firmware will only load signed bootloaders and kernels. Certain use cases may also require that all kernel modules also be signed. Add a configuration option that to lock down the kernel - which includes requiring validly signed modules - if the kernel is secure-booted. Signed-off-by: David Howells cc: linux-efi@vger.kernel.org --- arch/x86/Kconfig | 12 ++++++++++++ arch/x86/kernel/setup.c | 8 +++++++- 2 files changed, 19 insertions(+), 1 deletion(-) -- To unsubscribe from this list: send the line "unsubscribe linux-security-module" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index cc98d5a294ee..21f39855661d 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1817,6 +1817,18 @@ config EFI_MIXED If unsure, say N. +config EFI_SECURE_BOOT_LOCK_DOWN + def_bool n + depends on EFI + prompt "Lock down the kernel when UEFI Secure Boot is enabled" + ---help--- + UEFI Secure Boot provides a mechanism for ensuring that the firmware + will only load signed bootloaders and kernels. Certain use cases may + also require that all kernel modules also be signed and that + userspace is prevented from directly changing the running kernel + image. Say Y here to automatically lock down the kernel when a + system boots with UEFI Secure Boot enabled. + config SECCOMP def_bool y prompt "Enable seccomp to safely compute untrusted bytecode" diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index 396285bddb93..85dfa745c442 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -69,6 +69,7 @@ #include #include #include +#include #include