From patchwork Wed Apr 19 15:12:45 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jorge Lopez X-Patchwork-Id: 13217007 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 C2224C77B7E for ; Wed, 19 Apr 2023 15:13:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232643AbjDSPNK (ORCPT ); Wed, 19 Apr 2023 11:13:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35026 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232823AbjDSPNG (ORCPT ); Wed, 19 Apr 2023 11:13:06 -0400 Received: from mail-oi1-x22c.google.com (mail-oi1-x22c.google.com [IPv6:2607:f8b0:4864:20::22c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DE3F049DB; Wed, 19 Apr 2023 08:13:00 -0700 (PDT) Received: by mail-oi1-x22c.google.com with SMTP id 5614622812f47-38c0a331d3cso1242077b6e.1; Wed, 19 Apr 2023 08:13:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1681917180; x=1684509180; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:from:to:cc:subject:date:message-id :reply-to; bh=I0MN3rmC2Cti4f4qVv8lFeF+tvj8v0RUpECBbW/4GFg=; b=HEJ4tTd0cqjk7RUpilmZO3s7XEheHovP8Tuwg32jvaXJRjzqzmw5wml5wcOfezZUlA UEzbPyJldudYmD/gvzjUip+/7CMpH6LP6I+XAWJCzK+lBrry76CRa8reA78x+owMY8Wc tcJXwUgr87QdTQ3MJniNtMsxxQP5rD88zIvf/hqWl8wPuzHixhc3nQHG8WkD2ogwhWeA Ji53poL3hMH4hWWKnpakvC8ni5hZtbFYgf+LoPoeDpazVF6njAPuV6wgh2aKcxrxG6Q3 FMmcdaHvTxKx0ujw0huX346OY4mdLITSoGqXBLULg1CGrPAxmcotcIeM8oU25xnyalKE o7+Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1681917180; x=1684509180; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=I0MN3rmC2Cti4f4qVv8lFeF+tvj8v0RUpECBbW/4GFg=; b=kE5fCaCqGB/1SXGW5Xp6zX+wQpjZEv4tfNzHoqAwV4jItagAEPiPAImzaNJ8Ty7Fe8 I1f0ogsa+TTD/T4zl/X1rel0wLNgzZ8o18nKk5EWUSYqWHVyrpjsr+LHoS5ckQpdEmaJ gseC322sQWis1ecXQf2TpuVdhxgW3oWpcqZwaNw+5Fr0uBwQNvjnvSyum2kkJT0EUuCB CTRTyVoWldQ5PNznY4xQi7pgE73vqdwrBy5I4/BdLCXzw+gFGAVSEoQAQ8JYHHsi5NQZ tRUhBvVM8ho6pwiIZLXD18j2UOVtHHIUk2onCiwrXrDJn/LEjuh+71+SzMyAyaPFaAzA 6sJA== X-Gm-Message-State: AAQBX9cFzeE+E8RRmVtnAunEnJ9Ejr7ERLgzBTyDVu/fLtpgSO6nRUKf LPxJys5rLH91OerPpDz5QG8= X-Google-Smtp-Source: AKy350aHkJ4tk6bR8PI6kY757v2H2iL/YmRVPLVhtFl9/apROVBDbdxZiPSTwUQAd8IDzSoOy4Xdxg== X-Received: by 2002:a05:6808:3a1:b0:386:a30c:f16a with SMTP id n1-20020a05680803a100b00386a30cf16amr3260419oie.50.1681917180017; Wed, 19 Apr 2023 08:13:00 -0700 (PDT) Received: from grumpy-VECTOR.hsd1.tx.comcast.net ([2601:2c3:480:7390:e175:6963:338:7453]) by smtp.gmail.com with ESMTPSA id o10-20020acad70a000000b0038bae910f7bsm5766847oig.1.2023.04.19.08.12.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 19 Apr 2023 08:12:59 -0700 (PDT) From: Jorge Lopez X-Google-Original-From: Jorge Lopez To: hdegoede@redhat.com, platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org, thomas@t-8ch.de Subject: [PATCH v10 05/14] HP BIOSCFG driver - ordered-attributes Date: Wed, 19 Apr 2023 10:12:45 -0500 Message-Id: <20230419151249.6126-6-jorge.lopez2@hp.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230419151249.6126-1-jorge.lopez2@hp.com> References: <20230419151249.6126-1-jorge.lopez2@hp.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: platform-driver-x86@vger.kernel.org HP BIOS Configuration driver purpose is to provide a driver supporting the latest sysfs class firmware attributes framework allowing the user to change BIOS settings and security solutions on HP Inc.’s commercial notebooks. Many features of HP Commercial notebooks can be managed using Windows Management Instrumentation (WMI). WMI is an implementation of Web-Based Enterprise Management (WBEM) that provides a standards-based interface for changing and monitoring system settings. HP BIOSCFG driver provides a native Linux solution and the exposed features facilitates the migration to Linux environments. The Linux security features to be provided in hp-bioscfg driver enables managing the BIOS settings and security solutions via sysfs, a virtual filesystem that can be used by user-mode applications. The new documentation cover HP-specific firmware sysfs attributes such Secure Platform Management and Sure Start. Each section provides security feature description and identifies sysfs directories and files exposed by the driver. Many HP Commercial notebooks include a feature called Secure Platform Management (SPM), which replaces older password-based BIOS settings management with public key cryptography. PC secure product management begins when a target system is provisioned with cryptographic keys that are used to ensure the integrity of communications between system management utilities and the BIOS. HP Commercial notebooks have several BIOS settings that control its behaviour and capabilities, many of which are related to security. To prevent unauthorized changes to these settings, the system can be configured to use a cryptographic signature-based authorization string that the BIOS will use to verify authorization to modify the setting. Linux Security components are under development and not published yet. The only linux component is the driver (hp bioscfg) at this time. Other published security components are under Windows. Signed-off-by: Jorge Lopez --- Based on the latest platform-drivers-x86.git/for-next --- .../x86/hp/hp-bioscfg/ordered-attributes.c | 563 ++++++++++++++++++ 1 file changed, 563 insertions(+) create mode 100644 drivers/platform/x86/hp/hp-bioscfg/ordered-attributes.c diff --git a/drivers/platform/x86/hp/hp-bioscfg/ordered-attributes.c b/drivers/platform/x86/hp/hp-bioscfg/ordered-attributes.c new file mode 100644 index 000000000000..5e5d540f728d --- /dev/null +++ b/drivers/platform/x86/hp/hp-bioscfg/ordered-attributes.c @@ -0,0 +1,563 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Functions corresponding to ordered list type attributes under + * BIOS ORDERED LIST GUID for use with hp-bioscfg driver. + * + * Copyright (c) 2022 HP Development Company, L.P. + */ + +#include "bioscfg.h" + +GET_INSTANCE_ID(ordered_list); + +static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) +{ + + int instance_id = get_ordered_list_instance_id(kobj); + + if (instance_id < 0) + return -EIO; + + return sysfs_emit(buf, "%s\n", + bioscfg_drv.ordered_list_data[instance_id].current_value); +} + +/* + * validate_ordered_list_value - + * Validate input of current_value against possible values + * + * @instance_id: The instance on which input is validated + * @buf: Input value + */ +static int validate_ordered_list_values(int instance_id, const char *buf) +{ + int ret = 0; + int found = 0; + char *new_values = NULL; + char *value; + int elem; + int elem_found = 0; + + /* Is it a read only attribute */ + if (bioscfg_drv.ordered_list_data[instance_id].common.is_readonly) + return -EIO; + + new_values = kstrdup(buf, GFP_KERNEL); + + /* + * Changes to ordered list values require checking that new + * values are found in the list of elements. + */ + elem_found = 0; + while (elem_found < bioscfg_drv.ordered_list_data[instance_id].elements_size) { + + value = strsep(&new_values, ","); + if (value != NULL) { + if (!*value) + continue; + elem_found++; + } + + found = 0; + for (elem = 0; elem < bioscfg_drv.ordered_list_data[instance_id].elements_size; elem++) { + if (!strcasecmp(bioscfg_drv.ordered_list_data[instance_id].elements[elem], value)) { + found = 1; + break; + } + } + + + if (!found) { + ret = -EINVAL; + goto out_list_value; + } + } + + if (elem_found == bioscfg_drv.ordered_list_data[instance_id].elements_size) { + pr_warn("Number of new values is not equal to number of ordered list elements (%d)\n", + bioscfg_drv.ordered_list_data[instance_id].elements_size); + ret = -EINVAL; + goto out_list_value; + } + +out_list_value: + kfree(new_values); + return ret; +} + +/* + * validate_ordered_input() - + * Validate input of current_value against possible values + * + * @instance_id: The instance on which input is validated + * @buf: Input value + */ +static int validate_ordered_list_input(int instance_id, const char *buf) +{ + int ret = 0; + + ret = validate_ordered_list_values(instance_id, buf); + if (ret < 0) + return -EINVAL; + + /* + * set pending reboot flag depending on + * "RequiresPhysicalPresence" value + */ + if (bioscfg_drv.ordered_list_data[instance_id].common.requires_physical_presence) + bioscfg_drv.pending_reboot = true; + + return ret; +} + +static void update_ordered_list_value(int instance_id, char *attr_value) +{ + strscpy(bioscfg_drv.ordered_list_data[instance_id].current_value, + attr_value, + sizeof(bioscfg_drv.ordered_list_data[instance_id].current_value)); +} + +ATTRIBUTE_S_COMMON_PROPERTY_SHOW(display_name_language_code, ordered_list); +static struct kobj_attribute ordered_list_display_langcode = + __ATTR_RO(display_name_language_code); + +ATTRIBUTE_S_COMMON_PROPERTY_SHOW(display_name, ordered_list); +static struct kobj_attribute ordered_list_display_name = + __ATTR_RO(display_name); + +ATTRIBUTE_PROPERTY_STORE(current_value, ordered_list); +static struct kobj_attribute ordered_list_current_val = + __ATTR_RW_MODE(current_value, 0644); + + +ATTRIBUTE_N_COMMON_PROPERTY_SHOW(prerequisites_size, ordered_list); +static struct kobj_attribute ordered_list_prerequisites_size_val = + __ATTR_RO(prerequisites_size); + +ATTRIBUTE_V_COMMON_PROPERTY_SHOW(prerequisites, ordered_list); +static struct kobj_attribute ordered_list_prerequisites_val = + __ATTR_RO(prerequisites); + +ATTRIBUTE_N_PROPERTY_SHOW(elements_size, ordered_list); +static struct kobj_attribute ordered_list_elements_size_val = + __ATTR_RO(elements_size); + +ATTRIBUTE_VALUES_PROPERTY_SHOW(elements, ordered_list); +static struct kobj_attribute ordered_list_elements_val = + __ATTR_RO(elements); + +static ssize_t type_show(struct kobject *kobj, struct kobj_attribute *attr, + char *buf) +{ + return sysfs_emit(buf, "ordered-list\n"); +} +static struct kobj_attribute ordered_list_type = + __ATTR_RO(type); + +static struct attribute *ordered_list_attrs[] = { + &ordered_list_display_langcode.attr, + &ordered_list_display_name.attr, + &ordered_list_current_val.attr, + &ordered_list_prerequisites_size_val.attr, + &ordered_list_prerequisites_val.attr, + &ordered_list_elements_val.attr, + &ordered_list_elements_size_val.attr, + &ordered_list_type.attr, + NULL +}; + +static const struct attribute_group ordered_list_attr_group = { + .attrs = ordered_list_attrs, +}; + +int alloc_ordered_list_data(void) +{ + int ret = 0; + + bioscfg_drv.ordered_list_instances_count = + get_instance_count(HP_WMI_BIOS_ORDERED_LIST_GUID); + bioscfg_drv.ordered_list_data = kcalloc(bioscfg_drv.ordered_list_instances_count, + sizeof(struct ordered_list_data), GFP_KERNEL); + if (!bioscfg_drv.ordered_list_data) { + bioscfg_drv.ordered_list_instances_count = 0; + ret = -ENOMEM; + } + return ret; +} + +/* + * populate_ordered_list_package_data() - + * Populate all properties of an instance under ordered_list attribute + * + * @order_obj: ACPI object with ordered_list data + * @instance_id: The instance to enumerate + * @attr_name_kobj: The parent kernel object + */ +int populate_ordered_list_package_data(union acpi_object *order_obj, int instance_id, + struct kobject *attr_name_kobj) +{ + bioscfg_drv.ordered_list_data[instance_id].attr_name_kobj = attr_name_kobj; + + populate_ordered_list_elements_from_package(order_obj, + order_obj->package.count, + instance_id); + update_attribute_permissions(bioscfg_drv.ordered_list_data[instance_id].common.is_readonly, + &ordered_list_current_val); + friendly_user_name_update(bioscfg_drv.ordered_list_data[instance_id].common.path, + attr_name_kobj->name, + bioscfg_drv.ordered_list_data[instance_id].common.display_name, + sizeof(bioscfg_drv.ordered_list_data[instance_id].common.display_name)); + return sysfs_create_group(attr_name_kobj, &ordered_list_attr_group); +} + +/* Expected Values types associated with each element */ +static const acpi_object_type expected_order_types[] = { + [NAME] = ACPI_TYPE_STRING, + [VALUE] = ACPI_TYPE_STRING, + [PATH] = ACPI_TYPE_STRING, + [IS_READONLY] = ACPI_TYPE_INTEGER, + [DISPLAY_IN_UI] = ACPI_TYPE_INTEGER, + [REQUIRES_PHYSICAL_PRESENCE] = ACPI_TYPE_INTEGER, + [SEQUENCE] = ACPI_TYPE_INTEGER, + [PREREQUISITES_SIZE] = ACPI_TYPE_INTEGER, + [PREREQUISITES] = ACPI_TYPE_STRING, + [SECURITY_LEVEL] = ACPI_TYPE_INTEGER, + [ORD_LIST_SIZE] = ACPI_TYPE_INTEGER, + [ORD_LIST_ELEMENTS] = ACPI_TYPE_STRING +}; + + +int populate_ordered_list_elements_from_package(union acpi_object *order_obj, + int order_obj_count, + int instance_id) +{ + char *str_value = NULL; + int value_len; + int ret = 0; + u32 size = 0; + u32 int_value; + int elem = 0; + int reqs; + int eloc; + char *tmpstr = NULL; + char *part_tmp = NULL; + int tmp_len = 0; + char *part = NULL; + + if (!order_obj) + return -EINVAL; + + strscpy(bioscfg_drv.ordered_list_data[instance_id].common.display_name_language_code, + LANG_CODE_STR, + sizeof(bioscfg_drv.ordered_list_data[instance_id].common.display_name_language_code)); + + for (elem = 1, eloc = 1; elem < order_obj_count; elem++, eloc++) { + + /* ONLY look at the first ORDERED_ELEM_CNT elements */ + if (eloc == ORDERED_ELEM_CNT) + goto exit_list_package; + + switch (order_obj[elem].type) { + case ACPI_TYPE_STRING: + + if (elem != PREREQUISITES && elem != ORD_LIST_ELEMENTS) { + ret = convert_hexstr_to_str(order_obj[elem].string.pointer, + order_obj[elem].string.length, + &str_value, &value_len); + if (ret) + continue; + } + break; + case ACPI_TYPE_INTEGER: + int_value = (u32)order_obj[elem].integer.value; + break; + default: + pr_warn("Unsupported object type [%d]\n", order_obj[elem].type); + continue; + } + + /* Check that both expected and read object type match */ + if (expected_order_types[eloc] != order_obj[elem].type) { + pr_err("Error expected type %d for elem %d, but got type %d instead\n", + expected_order_types[eloc], elem, order_obj[elem].type); + return -EIO; + } + + /* Assign appropriate element value to corresponding field*/ + switch (eloc) { + case VALUE: + strscpy(bioscfg_drv.ordered_list_data[instance_id].current_value, + str_value, sizeof(bioscfg_drv.ordered_list_data[instance_id].current_value)); + break; + case PATH: + strscpy(bioscfg_drv.ordered_list_data[instance_id].common.path, str_value, + sizeof(bioscfg_drv.ordered_list_data[instance_id].common.path)); + break; + case IS_READONLY: + bioscfg_drv.ordered_list_data[instance_id].common.is_readonly = int_value; + break; + case DISPLAY_IN_UI: + bioscfg_drv.ordered_list_data[instance_id].common.display_in_ui = int_value; + break; + case REQUIRES_PHYSICAL_PRESENCE: + bioscfg_drv.ordered_list_data[instance_id].common.requires_physical_presence = int_value; + break; + case SEQUENCE: + bioscfg_drv.ordered_list_data[instance_id].common.sequence = int_value; + break; + case PREREQUISITES_SIZE: + bioscfg_drv.ordered_list_data[instance_id].common.prerequisites_size = int_value; + if (int_value > MAX_PREREQUISITES_SIZE) + pr_warn("Prerequisites size value exceeded the maximum number of elements supported or data may be malformed\n"); + + /* + * This HACK is needed to keep the expected + * element list pointing to the right obj[elem].type + * when the size is zero. PREREQUISITES + * object is omitted by BIOS when the size is + * zero. + */ + if (int_value == 0) + eloc++; + break; + case PREREQUISITES: + size = bioscfg_drv.ordered_list_data[instance_id].common.prerequisites_size; + + for (reqs = 0; reqs < size && reqs < MAX_PREREQUISITES_SIZE; reqs++) { + ret = convert_hexstr_to_str(order_obj[elem + reqs].string.pointer, + order_obj[elem + reqs].string.length, + &str_value, &value_len); + + if (ret) + continue; + + strscpy(bioscfg_drv.ordered_list_data[instance_id].common.prerequisites[reqs], + str_value, + sizeof(bioscfg_drv.ordered_list_data[instance_id].common.prerequisites[reqs])); + + kfree(str_value); + } + break; + + case SECURITY_LEVEL: + bioscfg_drv.ordered_list_data[instance_id].common.security_level = int_value; + break; + + case ORD_LIST_SIZE: + bioscfg_drv.ordered_list_data[instance_id].elements_size = int_value; + if (int_value > MAX_ELEMENTS_SIZE) + pr_warn("Ordered List size value exceeded the maximum number of elements supported or data may be malformed\n"); + /* + * This HACK is needed to keep the expected + * element list pointing to the right obj[elem].type + * when the size is zero. ORD_LIST_ELEMENTS + * object is omitted by BIOS when the size is + * zero. + */ + if (int_value == 0) + eloc++; + break; + case ORD_LIST_ELEMENTS: + size = bioscfg_drv.ordered_list_data[instance_id].elements_size; + + /* + * Ordered list data is stored in hex and comma separated format + * Convert the data and split it to show each element + */ + ret = convert_hexstr_to_str(str_value, value_len, &tmpstr, &tmp_len); + if (ret) + goto exit_list_package; + + part_tmp = tmpstr; + part = strsep(&part_tmp, ","); + if (!part) + strscpy(bioscfg_drv.ordered_list_data[instance_id].elements[0], + tmpstr, + sizeof(bioscfg_drv.ordered_list_data[instance_id].elements[0])); + + for (elem = 1; elem < MAX_ELEMENTS_SIZE && part; elem++) { + strscpy(bioscfg_drv.ordered_list_data[instance_id].elements[elem], + part, + sizeof(bioscfg_drv.ordered_list_data[instance_id].elements[elem])); + part = strsep(&part_tmp, ","); + } + + kfree(tmpstr); + break; + default: + pr_warn("Invalid element: %d found in Ordered_List attribute or data may be malformed\n", elem); + break; + } + kfree(tmpstr); + kfree(str_value); + } + +exit_list_package: + kfree(tmpstr); + kfree(str_value); + return 0; +} + +/* + * populate_ordered_list_data() - Populate all properties of an + * instance under ordered list attribute + * + * @buffer_ptr: Buffer pointer + * @buffer_size: Buffer size + * @instance_id: The instance to enumerate + * @attr_name_kobj: The parent kernel object + * @enum_property_count: Total properties count under ordered list type + */ +int populate_ordered_list_buffer_data(u8 *buffer_ptr, u32 *buffer_size, int instance_id, + struct kobject *attr_name_kobj) +{ + + bioscfg_drv.ordered_list_data[instance_id].attr_name_kobj = attr_name_kobj; + + /* Populate ordered list elements */ + populate_ordered_list_elements_from_buffer(buffer_ptr, buffer_size, + instance_id); + update_attribute_permissions(bioscfg_drv.ordered_list_data[instance_id].common.is_readonly, + &ordered_list_current_val); + friendly_user_name_update(bioscfg_drv.ordered_list_data[instance_id].common.path, + attr_name_kobj->name, + bioscfg_drv.ordered_list_data[instance_id].common.display_name, + sizeof(bioscfg_drv.ordered_list_data[instance_id].common.display_name)); + + return sysfs_create_group(attr_name_kobj, &ordered_list_attr_group); +} + +int populate_ordered_list_elements_from_buffer(u8 *buffer_ptr, u32 *buffer_size, + int instance_id) +{ + int ret; + char *dst = NULL; + int elem; + int reqs; + int integer; + int size = 0; + int values; + int dst_size = *buffer_size / sizeof(u16); + + dst = kcalloc(dst_size, sizeof(char), GFP_KERNEL); + if (!dst) + return -ENOMEM; + + elem = 0; + strscpy(bioscfg_drv.ordered_list_data[instance_id].common.display_name_language_code, + LANG_CODE_STR, + sizeof(bioscfg_drv.ordered_list_data[instance_id].common.display_name_language_code)); + + for (elem = 1; elem < 3; elem++) { + + ret = get_string_from_buffer(&buffer_ptr, buffer_size, dst, dst_size); + if (ret < 0) + continue; + + switch (elem) { + case VALUE: + strscpy(bioscfg_drv.ordered_list_data[instance_id].current_value, + dst, sizeof(bioscfg_drv.ordered_list_data[instance_id].current_value)); + break; + case PATH: + strscpy(bioscfg_drv.ordered_list_data[instance_id].common.path, dst, + sizeof(bioscfg_drv.ordered_list_data[instance_id].common.path)); + break; + default: + pr_warn("Invalid element: %d found in Ordered list attribute or data may be malformed\n", elem); + break; + } + } + for (elem = 3; elem < ORDERED_ELEM_CNT; elem++) { + + if (elem != PREREQUISITES && elem != ORD_LIST_ELEMENTS) { + ret = get_integer_from_buffer((int **)&buffer_ptr, buffer_size, (int *)&integer); + if (ret < 0) + continue; + } + + switch (elem) { + + case IS_READONLY: + bioscfg_drv.ordered_list_data[instance_id].common.is_readonly = integer; + break; + case DISPLAY_IN_UI: + bioscfg_drv.ordered_list_data[instance_id].common.display_in_ui = integer; + break; + case REQUIRES_PHYSICAL_PRESENCE: + bioscfg_drv.ordered_list_data[instance_id].common.requires_physical_presence = integer; + break; + case SEQUENCE: + bioscfg_drv.ordered_list_data[instance_id].common.sequence = integer; + break; + case PREREQUISITES_SIZE: + bioscfg_drv.ordered_list_data[instance_id].common.prerequisites_size = integer; + if (integer > MAX_PREREQUISITES_SIZE) + pr_warn("Prerequisites size value exceeded the maximum number of elements supported or data may be malformed\n"); + + // PREREQUISITES: + elem++; + size = bioscfg_drv.ordered_list_data[instance_id].common.prerequisites_size; + for (reqs = 0; reqs < size && reqs < MAX_PREREQUISITES_SIZE; reqs++) { + ret = get_string_from_buffer(&buffer_ptr, buffer_size, dst, dst_size); + if (ret < 0) + continue; + + strscpy(bioscfg_drv.ordered_list_data[instance_id].common.prerequisites[reqs], + dst, + sizeof(bioscfg_drv.ordered_list_data[instance_id].common.prerequisites[reqs])); + } + break; + case SECURITY_LEVEL: + bioscfg_drv.ordered_list_data[instance_id].common.security_level = integer; + break; + case ORD_LIST_SIZE: + bioscfg_drv.ordered_list_data[instance_id].elements_size = integer; + if (integer > MAX_ELEMENTS_SIZE) + pr_warn("Ordered List size value exceeded the maximum number of elements supported or data may be malformed\n"); + + // ORD_LIST_ELEMENTS: + elem++; + size = bioscfg_drv.ordered_list_data[instance_id].elements_size; + for (values = 0; values < size && values < MAX_ELEMENTS_SIZE; values++) { + ret = get_string_from_buffer(&buffer_ptr, buffer_size, dst, dst_size); + if (ret < 0) + continue; + + strscpy(bioscfg_drv.ordered_list_data[instance_id].elements[values], + dst, + sizeof(bioscfg_drv.ordered_list_data[instance_id].elements)[values]); + } + break; + default: + pr_warn("Invalid element: %d found in Ordered list attribute or data may be malformed\n", elem); + break; + } + } + kfree(dst); + + return 0; +} + + +/* + * exit_ordered_list_attributes() - Clear all attribute data + * + * Clears all data allocated for this group of attributes + */ +void exit_ordered_list_attributes(void) +{ + int instance_id; + + for (instance_id = 0; instance_id < bioscfg_drv.ordered_list_instances_count; instance_id++) { + struct kobject *attr_name_kobj = bioscfg_drv.ordered_list_data[instance_id].attr_name_kobj; + + if (attr_name_kobj) + sysfs_remove_group(attr_name_kobj, + &ordered_list_attr_group); + } + bioscfg_drv.ordered_list_instances_count = 0; + + kfree(bioscfg_drv.ordered_list_data); + bioscfg_drv.ordered_list_data = NULL; +}