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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 19 Aug 2019 13:35:23 +0100 Received: from d06av25.portsmouth.uk.ibm.com (d06av25.portsmouth.uk.ibm.com [9.149.105.61]) by b06cxnps4076.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x7JCZMM751773480 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 19 Aug 2019 12:35:22 GMT Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4C49A11C054; Mon, 19 Aug 2019 12:35:22 +0000 (GMT) Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id F354311C05B; Mon, 19 Aug 2019 12:35:19 +0000 (GMT) Received: from swastik.ibm.com (unknown [9.80.231.242]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 19 Aug 2019 12:35:19 +0000 (GMT) From: Nayna Jain To: linuxppc-dev@ozlabs.org, linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v5 1/2] powerpc: detect the secure boot mode of the system Date: Mon, 19 Aug 2019 08:35:07 -0400 X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1566218108-12705-1-git-send-email-nayna@linux.ibm.com> References: <1566218108-12705-1-git-send-email-nayna@linux.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 19081912-0012-0000-0000-000003405B8D X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19081912-0013-0000-0000-0000217A7B9C Message-Id: <1566218108-12705-2-git-send-email-nayna@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-08-19_03:, , 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=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1908190142 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Ard Biesheuvel , Eric Ricther , Nayna Jain , Claudio Carvalho , Mimi Zohar , Matthew Garret , Paul Mackerras , Jeremy Kerr , Elaine Palmer , George Wilson Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Secure boot on POWER 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. The PPC_SECURE_BOOT config represents the base enablement of secureboot on POWER. Signed-off-by: Nayna Jain --- arch/powerpc/Kconfig | 11 +++++ arch/powerpc/include/asm/secboot.h | 27 ++++++++++++ arch/powerpc/kernel/Makefile | 2 + arch/powerpc/kernel/secboot.c | 71 ++++++++++++++++++++++++++++++ 4 files changed, 111 insertions(+) create mode 100644 arch/powerpc/include/asm/secboot.h create mode 100644 arch/powerpc/kernel/secboot.c diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 77f6ebf97113..c902a39124dc 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -912,6 +912,17 @@ config PPC_MEM_KEYS If unsure, say y. +config PPC_SECURE_BOOT + prompt "Enable PowerPC Secure Boot" + bool + default n + depends on PPC64 + help + Linux on POWER with firmware secure boot enabled needs to define + security policies to extend secure boot to the OS.This config + allows user to enable OS Secure Boot on PowerPC systems that + have firmware secure boot support. + endmenu config ISA_DMA_API diff --git a/arch/powerpc/include/asm/secboot.h b/arch/powerpc/include/asm/secboot.h new file mode 100644 index 000000000000..e726261bb00b --- /dev/null +++ b/arch/powerpc/include/asm/secboot.h @@ -0,0 +1,27 @@ +/* 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 + +#ifdef CONFIG_PPC_SECURE_BOOT +extern struct device_node *is_powerpc_secvar_supported(void); +extern bool get_powerpc_secureboot(void); +#else +static inline struct device_node *is_powerpc_secvar_supported(void) +{ + return NULL; +} + +static inline bool get_powerpc_secureboot(void) +{ + return false; +} + +#endif +#endif diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile index ea0c69236789..d310ebb4e526 100644 --- a/arch/powerpc/kernel/Makefile +++ b/arch/powerpc/kernel/Makefile @@ -157,6 +157,8 @@ endif obj-$(CONFIG_EPAPR_PARAVIRT) += epapr_paravirt.o epapr_hcalls.o obj-$(CONFIG_KVM_GUEST) += kvm.o kvm_emul.o +obj-$(CONFIG_PPC_SECURE_BOOT) += secboot.o + # Disable GCOV, KCOV & sanitizers in odd or sensitive code GCOV_PROFILE_prom_init.o := n KCOV_INSTRUMENT_prom_init.o := n diff --git a/arch/powerpc/kernel/secboot.c b/arch/powerpc/kernel/secboot.c new file mode 100644 index 000000000000..5ea0d52d64ef --- /dev/null +++ b/arch/powerpc/kernel/secboot.c @@ -0,0 +1,71 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 IBM Corporation + * Author: Nayna Jain + * + * secboot.c + * - util function to get powerpc secboot state + */ +#include +#include +#include + +struct device_node *is_powerpc_secvar_supported(void) +{ + struct device_node *np; + int status; + + np = of_find_node_by_name(NULL, "ibm,secureboot"); + if (!np) { + pr_info("secureboot node is not found\n"); + return NULL; + } + + status = of_device_is_compatible(np, "ibm,secureboot-v3"); + if (!status) { + pr_info("Secure variables are not supported by this firmware\n"); + return NULL; + } + + return np; +} + +bool get_powerpc_secureboot(void) +{ + struct device_node *np; + struct device_node *secvar_np; + const u64 *psecboot; + u64 secboot = 0; + + np = is_powerpc_secvar_supported(); + if (!np) + goto disabled; + + /* Fail-safe for any failure related to secvar */ + secvar_np = of_get_child_by_name(np, "secvar"); + if (!secvar_np) { + pr_err("Expected secure variables support, fail-safe\n"); + goto enabled; + } + + if (!of_device_is_available(secvar_np)) { + pr_err("Secure variables support is in error state, fail-safe\n"); + goto enabled; + } + + psecboot = of_get_property(secvar_np, "secure-mode", NULL); + if (!psecboot) + goto enabled; + + secboot = be64_to_cpup((__be64 *)psecboot); + if (!(secboot & (~0x0))) + goto disabled; + +enabled: + pr_info("secureboot mode enabled\n"); + return true; + +disabled: + pr_info("secureboot mode disabled\n"); + return false; +} -- 2.20.1