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Mon, 8 Aug 2022 15:43:48 +0000 (GMT) Received: from rhel-laptop.ibm.com.com (unknown [9.160.34.213]) by b03ledav004.gho.boulder.ibm.com (Postfix) with ESMTP; Mon, 8 Aug 2022 15:43:48 +0000 (GMT) From: gjoyce@linux.vnet.ibm.com To: linux-block@vger.kernel.org Subject: [PATCH v3a 1/2] lib: generic accessor functions for arch keystore Date: Mon, 8 Aug 2022 10:43:44 -0500 Message-Id: <20220808154345.11240-2-gjoyce@linux.vnet.ibm.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220808154345.11240-1-gjoyce@linux.vnet.ibm.com> References: <20220808154345.11240-1-gjoyce@linux.vnet.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: 3jKGgdTabMg7G_nunuX-UgB3NGt8eIGU X-Proofpoint-GUID: 3jKGgdTabMg7G_nunuX-UgB3NGt8eIGU 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=2022-08-08_10,2022-08-08_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 malwarescore=0 spamscore=0 suspectscore=0 clxscore=1015 bulkscore=0 mlxlogscore=999 impostorscore=0 priorityscore=1501 adultscore=0 phishscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2206140000 definitions=main-2208080075 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: axboe@kernel.dk, linux-efi@vger.kernel.org, gjoyce@linux.vnet.ibm.com, nayna@linux.ibm.com, keyrings@vger.kernel.org, jonathan.derrick@linux.dev, brking@linux.vnet.ibm.com, akpm@linux-foundation.org, msuchanek@suse.de, linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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; +} From patchwork Mon Aug 8 15:43:45 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Joyce X-Patchwork-Id: 1664643 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=UjhwfRU/; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org (client-ip=112.213.38.117; helo=lists.ozlabs.org; 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Mon, 8 Aug 2022 15:43:50 +0000 (GMT) Received: from rhel-laptop.ibm.com.com (unknown [9.160.34.213]) by b03ledav004.gho.boulder.ibm.com (Postfix) with ESMTP; Mon, 8 Aug 2022 15:43:50 +0000 (GMT) From: gjoyce@linux.vnet.ibm.com To: linux-block@vger.kernel.org Subject: [PATCH v3a 2/2] powerpc/pseries: Override lib/arch_vars.c functions Date: Mon, 8 Aug 2022 10:43:45 -0500 Message-Id: <20220808154345.11240-3-gjoyce@linux.vnet.ibm.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220808154345.11240-1-gjoyce@linux.vnet.ibm.com> References: <20220808154345.11240-1-gjoyce@linux.vnet.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: x3Mw2vB0hgJ4LR6g2Ez-ea2ha6KH1oWB X-Proofpoint-ORIG-GUID: x3Mw2vB0hgJ4LR6g2Ez-ea2ha6KH1oWB 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=2022-08-08_10,2022-08-08_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 impostorscore=0 suspectscore=0 adultscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxlogscore=999 phishscore=0 bulkscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2206140000 definitions=main-2208080075 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: axboe@kernel.dk, linux-efi@vger.kernel.org, gjoyce@linux.vnet.ibm.com, nayna@linux.ibm.com, keyrings@vger.kernel.org, jonathan.derrick@linux.dev, brking@linux.vnet.ibm.com, akpm@linux-foundation.org, msuchanek@suse.de, linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" From: Greg Joyce Self Encrypting Drives(SED) make use of POWER LPAR Platform KeyStore for storing its variables. Thus the block subsystem needs to access PowerPC specific functions to read/write objects in PLPKS. Override the default implementations in lib/arch_vars.c file with PowerPC specific versions. Signed-off-by: Greg Joyce --- arch/powerpc/platforms/pseries/Makefile | 1 + .../platforms/pseries/plpks_arch_ops.c | 167 ++++++++++++++++++ 2 files changed, 168 insertions(+) create mode 100644 arch/powerpc/platforms/pseries/plpks_arch_ops.c diff --git a/arch/powerpc/platforms/pseries/Makefile b/arch/powerpc/platforms/pseries/Makefile index 14e143b946a3..3a545422eae5 100644 --- a/arch/powerpc/platforms/pseries/Makefile +++ b/arch/powerpc/platforms/pseries/Makefile @@ -29,6 +29,7 @@ obj-$(CONFIG_PPC_SPLPAR) += vphn.o obj-$(CONFIG_PPC_SVM) += svm.o obj-$(CONFIG_FA_DUMP) += rtas-fadump.o obj-$(CONFIG_PSERIES_PLPKS) += plpks.o +obj-$(CONFIG_PSERIES_PLPKS) += plpks_arch_ops.o obj-$(CONFIG_SUSPEND) += suspend.o obj-$(CONFIG_PPC_VAS) += vas.o vas-sysfs.o diff --git a/arch/powerpc/platforms/pseries/plpks_arch_ops.c b/arch/powerpc/platforms/pseries/plpks_arch_ops.c new file mode 100644 index 000000000000..fdea3322f696 --- /dev/null +++ b/arch/powerpc/platforms/pseries/plpks_arch_ops.c @@ -0,0 +1,167 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * POWER Platform arch specific code for SED + * Copyright (C) 2022 IBM Corporation + * + * Define operations for generic kernel subsystems to read/write keys + * from POWER LPAR Platform KeyStore(PLPKS). + * + * List of subsystems/usecase using PLPKS: + * - Self Encrypting Drives(SED) + */ + +#include +#include +#include +#include +#include +#include +#include +#include "plpks.h" + +/* + * variable structure that contains all SED data + */ +struct plpks_sed_object_data { + u_char version; + u_char pad1[7]; + u_long authority; + u_long range; + u_int key_len; + u_char key[32]; +}; + +/* + * ext_type values + * 00 no extension exists + * 01-1F common + * 20-3F AIX + * 40-5F Linux + * 60-7F IBMi + */ + +/* + * This extension is optional for version 1 sed_object_data + */ +struct sed_object_extension { + u8 ext_type; + u8 rsvd[3]; + u8 ext_data[64]; +}; + +#define PKS_SED_OBJECT_DATA_V1 1 +#define PKS_SED_MANGLED_LABEL "/default/pri" +#define PLPKS_SED_COMPONENT "sed-opal" + +#define PLPKS_ARCHVAR_POLICY WORLDREADABLE +#define PLPKS_ARCHVAR_OS_COMMON 4 + +/* + * Read the variable data from PKS given the label + */ +int arch_read_variable(enum arch_variable_type type, char *varname, + void *varbuf, u_int *varlen) +{ + struct plpks_var var; + struct plpks_sed_object_data *data; + u_int offset = 0; + char *buf = (char *)varbuf; + int ret; + + var.name = varname; + var.namelen = strlen(varname); + var.policy = PLPKS_ARCHVAR_POLICY; + var.os = PLPKS_ARCHVAR_OS_COMMON; + var.data = NULL; + var.datalen = 0; + + switch (type) { + case ARCH_VAR_OPAL_KEY: + var.component = PLPKS_SED_COMPONENT; +#ifdef OPAL_AUTH_KEY + if (strcmp(OPAL_AUTH_KEY, varname) == 0) { + var.name = PKS_SED_MANGLED_LABEL; + var.namelen = strlen(varname); + } +#endif + offset = offsetof(struct plpks_sed_object_data, key); + break; + case ARCH_VAR_OTHER: + var.component = ""; + break; + } + + ret = plpks_read_os_var(&var); + if (ret != 0) + return ret; + + if (offset > var.datalen) + offset = 0; + + switch (type) { + case ARCH_VAR_OPAL_KEY: + data = (struct plpks_sed_object_data *)var.data; + *varlen = data->key_len; + break; + case ARCH_VAR_OTHER: + *varlen = var.datalen; + break; + } + + if (var.data) { + memcpy(varbuf, var.data + offset, var.datalen - offset); + buf[*varlen] = '\0'; + kfree(var.data); + } + + return 0; +} + +/* + * Write the variable data to PKS given the label + */ +int arch_write_variable(enum arch_variable_type type, char *varname, + void *varbuf, u_int varlen) +{ + struct plpks_var var; + struct plpks_sed_object_data data; + struct plpks_var_name vname; + + var.name = varname; + var.namelen = strlen(varname); + var.policy = PLPKS_ARCHVAR_POLICY; + var.os = PLPKS_ARCHVAR_OS_COMMON; + var.datalen = varlen; + var.data = varbuf; + + switch (type) { + case ARCH_VAR_OPAL_KEY: + var.component = PLPKS_SED_COMPONENT; +#ifdef OPAL_AUTH_KEY + if (strcmp(OPAL_AUTH_KEY, varname) == 0) { + var.name = PKS_SED_MANGLED_LABEL; + var.namelen = strlen(varname); + } +#endif + var.datalen = sizeof(struct plpks_sed_object_data); + var.data = (u8 *)&data; + + /* initialize SED object */ + data.version = PKS_SED_OBJECT_DATA_V1; + data.authority = 0; + data.range = 0; + data.key_len = varlen; + memcpy(data.key, varbuf, varlen); + break; + case ARCH_VAR_OTHER: + var.component = ""; + break; + } + + /* variable update requires delete first */ + vname.namelen = var.namelen; + vname.name = var.name; + (void)plpks_remove_var(var.component, var.os, vname); + + return plpks_write_var(var); +}