From patchwork Mon Aug 1 12:34:25 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Joyce X-Patchwork-Id: 12933737 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0DB15C19F2A for ; Mon, 1 Aug 2022 12:46:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232360AbiHAMqn (ORCPT ); Mon, 1 Aug 2022 08:46:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49402 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234711AbiHAMqP (ORCPT ); Mon, 1 Aug 2022 08:46:15 -0400 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DEC6D402D3 for ; Mon, 1 Aug 2022 05:34:50 -0700 (PDT) Received: from pps.filterd (m0187473.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 271BRopI013486; Mon, 1 Aug 2022 12:34:43 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=vCkjYYMr8qi+Dx9V5Urxb8UXElS0dbRq92qE6ZnPnaE=; b=QqpkomTpoLdjHCZ5J4YFj8EgE3GafxnIGaWW0dA4TEgN5o9iRgSTudRq5ks+a7J7nxgS RGl8ux+S5p9p0NX6GEHvBTVW3CvGsX7EOad6m+oD1kaRLQ3lV6idezNh/Uivu9ZmFz6y su/+uOWuHfr8tuticUxeIZhm6P0m4z4QmaDAlY9h0IkYDOUeT238/Ba3Jupq8GwKRJqq QhVwV+AE53DJWXAsGJttSQS2/5SUHxPqLO2D0dnQGGFE09C9ak3ktXVnz0UrKSNKQHeW NpxS0GHLPCcYI1DTAM40AechMhuUbSxZUjmAzV3af+zCmzFohgB2/qylZMnCut+wGQpD EQ== Received: from ppma01wdc.us.ibm.com (fd.55.37a9.ip4.static.sl-reverse.com [169.55.85.253]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3hp9y31nyv-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 01 Aug 2022 12:34:43 +0000 Received: from pps.filterd (ppma01wdc.us.ibm.com [127.0.0.1]) by ppma01wdc.us.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 271CMVFe006703; Mon, 1 Aug 2022 12:34:42 GMT Received: from b03cxnp07029.gho.boulder.ibm.com (b03cxnp07029.gho.boulder.ibm.com [9.17.130.16]) by ppma01wdc.us.ibm.com with ESMTP id 3hmv993v4t-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 01 Aug 2022 12:34:42 +0000 Received: from b03ledav002.gho.boulder.ibm.com (b03ledav002.gho.boulder.ibm.com [9.17.130.233]) by b03cxnp07029.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 271CYfXt39059800 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 1 Aug 2022 12:34:41 GMT Received: from b03ledav002.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4BBFA136063; Mon, 1 Aug 2022 12:34:41 +0000 (GMT) Received: from b03ledav002.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 70C7C13605E; Mon, 1 Aug 2022 12:34:40 +0000 (GMT) Received: from rhel-laptop.ibm.com.com (unknown [9.77.138.167]) by b03ledav002.gho.boulder.ibm.com (Postfix) with ESMTP; Mon, 1 Aug 2022 12:34:40 +0000 (GMT) From: gjoyce@linux.vnet.ibm.com To: linux-block@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org, jonathan.derrick@linux.dev, brking@linux.vnet.ibm.com, gjoyce@ibm.com, nayna@linux.ibm.com, axboe@kernel.dk, akpm@linux-foundation.org, gjoyce@linux.vnet.ibm.com Subject: [PATCH v3 1/2] lib: generic accessor functions for arch keystore Date: Mon, 1 Aug 2022 07:34:25 -0500 Message-Id: <20220801123426.585801-2-gjoyce@linux.vnet.ibm.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220801123426.585801-1-gjoyce@linux.vnet.ibm.com> References: <20220801123426.585801-1-gjoyce@linux.vnet.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: eykm-2IEb1t6CAtQbve6m27bXBNYxvKV X-Proofpoint-GUID: eykm-2IEb1t6CAtQbve6m27bXBNYxvKV X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.883,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-08-01_07,2022-08-01_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 phishscore=0 lowpriorityscore=0 clxscore=1015 bulkscore=0 priorityscore=1501 malwarescore=0 adultscore=0 spamscore=0 impostorscore=0 mlxlogscore=999 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2206140000 definitions=main-2208010062 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org From: Greg Joyce Generic kernel subsystems may rely on platform specific persistent KeyStore to store objects containing sensitive key material. In such case, they need to access architecture specific functions to perform read/write operations on these variables. Define the generic variable read/write prototypes to be implemented by architecture specific versions. The default(weak) implementations of these prototypes return -EOPNOTSUPP unless overridden by architecture versions. Signed-off-by: Greg Joyce --- include/linux/arch_vars.h | 23 +++++++++++++++++++++++ lib/Makefile | 2 +- lib/arch_vars.c | 25 +++++++++++++++++++++++++ 3 files changed, 49 insertions(+), 1 deletion(-) create mode 100644 include/linux/arch_vars.h create mode 100644 lib/arch_vars.c diff --git a/include/linux/arch_vars.h b/include/linux/arch_vars.h new file mode 100644 index 000000000000..9c280ff9432e --- /dev/null +++ b/include/linux/arch_vars.h @@ -0,0 +1,23 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Platform variable opearations. + * + * Copyright (C) 2022 IBM Corporation + * + * These are the accessor functions (read/write) for architecture specific + * variables. Specific architectures can provide overrides. + * + */ + +#include + +enum arch_variable_type { + ARCH_VAR_OPAL_KEY = 0, /* SED Opal Authentication Key */ + ARCH_VAR_OTHER = 1, /* Other type of variable */ + ARCH_VAR_MAX = 1, /* Maximum type value */ +}; + +int arch_read_variable(enum arch_variable_type type, char *varname, + void *varbuf, u_int *varlen); +int arch_write_variable(enum arch_variable_type type, char *varname, + void *varbuf, u_int varlen); diff --git a/lib/Makefile b/lib/Makefile index f99bf61f8bbc..b90c4cb0dbbb 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -48,7 +48,7 @@ obj-y += bcd.o sort.o parser.o debug_locks.o random32.o \ bsearch.o find_bit.o llist.o memweight.o kfifo.o \ percpu-refcount.o rhashtable.o \ once.o refcount.o usercopy.o errseq.o bucket_locks.o \ - generic-radix-tree.o + generic-radix-tree.o arch_vars.o obj-$(CONFIG_STRING_SELFTEST) += test_string.o obj-y += string_helpers.o obj-$(CONFIG_TEST_STRING_HELPERS) += test-string_helpers.o diff --git a/lib/arch_vars.c b/lib/arch_vars.c new file mode 100644 index 000000000000..e6f16d7d09c1 --- /dev/null +++ b/lib/arch_vars.c @@ -0,0 +1,25 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Platform variable operations. + * + * Copyright (C) 2022 IBM Corporation + * + * These are the accessor functions (read/write) for architecture specific + * variables. Specific architectures can provide overrides. + * + */ + +#include +#include + +int __weak arch_read_variable(enum arch_variable_type type, char *varname, + void *varbuf, u_int *varlen) +{ + return -EOPNOTSUPP; +} + +int __weak arch_write_variable(enum arch_variable_type type, char *varname, + void *varbuf, u_int varlen) +{ + return -EOPNOTSUPP; +}