From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1g8U8c-0001Hk-CK for kexec@lists.infradead.org; Fri, 05 Oct 2018 17:43:45 +0000 Received: from pps.filterd (m0098404.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w95HdOau056008 for ; Fri, 5 Oct 2018 13:43:33 -0400 Received: from e06smtp02.uk.ibm.com (e06smtp02.uk.ibm.com [195.75.94.98]) by mx0a-001b2d01.pphosted.com with ESMTP id 2mxatndv8u-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Fri, 05 Oct 2018 13:43:33 -0400 Received: from localhost by e06smtp02.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 5 Oct 2018 18:43:31 +0100 From: Nayna Jain Subject: [PATCH v5 1/5] x86/ima: define arch_ima_get_secureboot Date: Fri, 5 Oct 2018 23:10:11 +0530 In-Reply-To: <20181005174015.21939-1-nayna@linux.vnet.ibm.com> References: <20181005174015.21939-1-nayna@linux.vnet.ibm.com> Message-Id: <20181005174015.21939-2-nayna@linux.vnet.ibm.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: linux-integrity@vger.kernel.org Cc: linux-efi@vger.kernel.org, Nayna Jain , kexec@lists.infradead.org, linux-kernel@vger.kernel.org, zohar@linux.ibm.com, dhowells@redhat.com, seth.forshee@canonical.com, linux-security-module@vger.kernel.org, jforbes@redhat.com From: Nayna Jain Distros are concerned about totally disabling the kexec_load syscall. As a compromise, the kexec_load syscall will only be disabled when CONFIG_KEXEC_VERIFY_SIG is configured and the system is booted with secureboot enabled. This patch defines the new arch specific function called arch_ima_get_secureboot() to retrieve the secureboot state of the system. Signed-off-by: Nayna Jain Suggested-by: Seth Forshee --- arch/x86/kernel/Makefile | 2 ++ arch/x86/kernel/ima_arch.c | 17 +++++++++++++++++ include/linux/ima.h | 9 +++++++++ 3 files changed, 28 insertions(+) create mode 100644 arch/x86/kernel/ima_arch.c diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile index 02d6f5cf4e70..f32406e51424 100644 --- a/arch/x86/kernel/Makefile +++ b/arch/x86/kernel/Makefile @@ -149,3 +149,5 @@ ifeq ($(CONFIG_X86_64),y) obj-$(CONFIG_MMCONF_FAM10H) += mmconf-fam10h_64.o obj-y += vsmp_64.o endif + +obj-$(CONFIG_IMA) += ima_arch.o diff --git a/arch/x86/kernel/ima_arch.c b/arch/x86/kernel/ima_arch.c new file mode 100644 index 000000000000..bb5a88d2b271 --- /dev/null +++ b/arch/x86/kernel/ima_arch.c @@ -0,0 +1,17 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Copyright (C) 2018 IBM Corporation + */ +#include +#include + +extern struct boot_params boot_params; + +bool arch_ima_get_secureboot(void) +{ + if (efi_enabled(EFI_BOOT) && + (boot_params.secure_boot == efi_secureboot_mode_enabled)) + return true; + else + return false; +} diff --git a/include/linux/ima.h b/include/linux/ima.h index 84806b54b50a..4852255aa4f4 100644 --- a/include/linux/ima.h +++ b/include/linux/ima.h @@ -30,6 +30,15 @@ extern void ima_post_path_mknod(struct dentry *dentry); extern void ima_add_kexec_buffer(struct kimage *image); #endif +#ifdef CONFIG_X86 +extern bool arch_ima_get_secureboot(void); +#else +static inline bool arch_ima_get_secureboot(void) +{ + return false; +} +#endif + #else static inline int ima_bprm_check(struct linux_binprm *bprm) { -- 2.13.6 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec