From patchwork Mon Apr 8 22:52:33 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nayna Jain X-Patchwork-Id: 10890259 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C45EF17E1 for ; Mon, 8 Apr 2019 22:53:03 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id AE7C728813 for ; Mon, 8 Apr 2019 22:53:03 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A31792882A; Mon, 8 Apr 2019 22:53:03 +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=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, 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 2D7BC287C9 for ; Mon, 8 Apr 2019 22:53:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726352AbfDHWxC (ORCPT ); Mon, 8 Apr 2019 18:53:02 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:58044 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728658AbfDHWxC (ORCPT ); Mon, 8 Apr 2019 18:53:02 -0400 Received: from pps.filterd (m0098409.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x38MnACI041551 for ; Mon, 8 Apr 2019 18:53:02 -0400 Received: from e06smtp05.uk.ibm.com (e06smtp05.uk.ibm.com [195.75.94.101]) by mx0a-001b2d01.pphosted.com with ESMTP id 2rreyegxug-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Mon, 08 Apr 2019 18:53:01 -0400 Received: from localhost by e06smtp05.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 8 Apr 2019 23:52:54 +0100 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x38Mqr7V59179042 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 8 Apr 2019 22:52:53 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3918B4C044; Mon, 8 Apr 2019 22:52:53 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7E9084C040; Mon, 8 Apr 2019 22:52:51 +0000 (GMT) Received: from swastik.ibm.com (unknown [9.85.157.39]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 8 Apr 2019 22:52:51 +0000 (GMT) From: Nayna Jain To: linuxppc-dev@ozlabs.org, linux-efi@vger.kernel.org, linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Michael Ellerman , Paul Mackerras , Benjamin Herrenschmidt , Ard Biesheuvel , Jeremy Kerr , Matthew Garret , Mimi Zohar , Claudio Carvalho , Nayna Jain Subject: [PATCH v2 2/3] powerpc/powernv: detect the secure boot mode of the system Date: Mon, 8 Apr 2019 18:52:33 -0400 X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1554763954-11795-1-git-send-email-nayna@linux.ibm.com> References: <1554763954-11795-1-git-send-email-nayna@linux.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 19040822-0020-0000-0000-0000032DAE16 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19040822-0021-0000-0000-0000217FD1AB Message-Id: <1554763954-11795-3-git-send-email-nayna@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-04-08_10:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=989 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904080164 Sender: linux-integrity-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP PowerNV secure boot defines different IMA policies based on the secure boot state of the system. This patch defines a function to detect the secure boot state of the system. Signed-off-by: Nayna Jain --- arch/powerpc/include/asm/secboot.h | 21 +++++++++ arch/powerpc/platforms/powernv/Makefile | 3 +- arch/powerpc/platforms/powernv/secboot.c | 54 ++++++++++++++++++++++++ 3 files changed, 77 insertions(+), 1 deletion(-) create mode 100644 arch/powerpc/include/asm/secboot.h create mode 100644 arch/powerpc/platforms/powernv/secboot.c diff --git a/arch/powerpc/include/asm/secboot.h b/arch/powerpc/include/asm/secboot.h new file mode 100644 index 000000000000..1904fb4a3352 --- /dev/null +++ b/arch/powerpc/include/asm/secboot.h @@ -0,0 +1,21 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * PowerPC secure boot definitions + * + * Copyright (C) 2019 IBM Corporation + * Author: Nayna Jain + * + */ +#ifndef POWERPC_SECBOOT_H +#define POWERPC_SECBOOT_H + +#if defined(CONFIG_OPAL_SECVAR) +extern bool get_powerpc_sb_mode(void); +#else +static inline bool get_powerpc_sb_mode(void) +{ + return false; +} +#endif + +#endif diff --git a/arch/powerpc/platforms/powernv/Makefile b/arch/powerpc/platforms/powernv/Makefile index 1511d836fd19..e3224f1019eb 100644 --- a/arch/powerpc/platforms/powernv/Makefile +++ b/arch/powerpc/platforms/powernv/Makefile @@ -4,6 +4,7 @@ obj-y += idle.o opal-rtc.o opal-nvram.o opal-lpc.o opal-flash.o obj-y += rng.o opal-elog.o opal-dump.o opal-sysparam.o opal-sensor.o obj-y += opal-msglog.o opal-hmi.o opal-power.o opal-irqchip.o obj-y += opal-kmsg.o opal-powercap.o opal-psr.o opal-sensor-groups.o +obj-y += secboot.o obj-$(CONFIG_SMP) += smp.o subcore.o subcore-asm.o obj-$(CONFIG_PCI) += pci.o pci-ioda.o npu-dma.o pci-ioda-tce.o @@ -16,4 +17,4 @@ obj-$(CONFIG_PERF_EVENTS) += opal-imc.o obj-$(CONFIG_PPC_MEMTRACE) += memtrace.o obj-$(CONFIG_PPC_VAS) += vas.o vas-window.o vas-debug.o obj-$(CONFIG_OCXL_BASE) += ocxl.o -obj-$(CONFIG_OPAL_SECVAR) += opal-secvar.o +obj-$(CONFIG_OPAL_SECVAR) += opal-secvar.o secboot.o diff --git a/arch/powerpc/platforms/powernv/secboot.c b/arch/powerpc/platforms/powernv/secboot.c new file mode 100644 index 000000000000..a9c5717bb78e --- /dev/null +++ b/arch/powerpc/platforms/powernv/secboot.c @@ -0,0 +1,54 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 IBM Corporation + * Author: Nayna Jain + * + * secboot.c + * - util functions to get powerpc secboot state + */ +#include +#include +#include + +bool get_powerpc_sb_mode(void) +{ + efi_char16_t efi_SecureBoot_name[] = L"SecureBoot"; + efi_char16_t efi_SetupMode_name[] = L"SetupMode"; + efi_guid_t efi_variable_guid = EFI_GLOBAL_VARIABLE_GUID; + efi_status_t status; + u8 secboot, setupmode; + unsigned long size = sizeof(secboot); + + status = opal_get_variable(efi_SecureBoot_name, &efi_variable_guid, + NULL, &size, &secboot); + + /* + * For now assume all failures reading the SecureBoot variable implies + * secure boot is not enabled. Later differentiate failure types. + */ + if (status != EFI_SUCCESS) { + secboot = 0; + setupmode = 0; + goto out; + } + + size = sizeof(setupmode); + status = opal_get_variable(efi_SetupMode_name, &efi_variable_guid, + NULL, &size, &setupmode); + + /* + * Failure to read the SetupMode variable does not prevent + * secure boot mode + */ + if (status != EFI_SUCCESS) + setupmode = 0; + +out: + if ((secboot == 0) || (setupmode == 1)) { + pr_info("secboot: secureboot mode disabled\n"); + return false; + } + + pr_info("secboot: secureboot mode enabled\n"); + return true; +}