diff options
Diffstat (limited to 'drivers/platform/x86/hp')
| -rw-r--r-- | drivers/platform/x86/hp/Kconfig | 16 | ||||
| -rw-r--r-- | drivers/platform/x86/hp/Makefile | 1 | ||||
| -rw-r--r-- | drivers/platform/x86/hp/hp-bioscfg/Makefile | 11 | ||||
| -rw-r--r-- | drivers/platform/x86/hp/hp-bioscfg/biosattr-interface.c | 312 | ||||
| -rw-r--r-- | drivers/platform/x86/hp/hp-bioscfg/bioscfg.c | 1063 | ||||
| -rw-r--r-- | drivers/platform/x86/hp/hp-bioscfg/bioscfg.h | 487 | ||||
| -rw-r--r-- | drivers/platform/x86/hp/hp-bioscfg/enum-attributes.c | 457 | ||||
| -rw-r--r-- | drivers/platform/x86/hp/hp-bioscfg/int-attributes.c | 418 | ||||
| -rw-r--r-- | drivers/platform/x86/hp/hp-bioscfg/order-list-attributes.c | 441 | ||||
| -rw-r--r-- | drivers/platform/x86/hp/hp-bioscfg/passwdobj-attributes.c | 556 | ||||
| -rw-r--r-- | drivers/platform/x86/hp/hp-bioscfg/spmobj-attributes.c | 381 | ||||
| -rw-r--r-- | drivers/platform/x86/hp/hp-bioscfg/string-attributes.c | 395 | ||||
| -rw-r--r-- | drivers/platform/x86/hp/hp-bioscfg/surestart-attributes.c | 132 |
13 files changed, 4670 insertions, 0 deletions
diff --git a/drivers/platform/x86/hp/Kconfig b/drivers/platform/x86/hp/Kconfig index ae165955311c..7fef4f12e498 100644 --- a/drivers/platform/x86/hp/Kconfig +++ b/drivers/platform/x86/hp/Kconfig @@ -60,4 +60,20 @@ config TC1100_WMI This is a driver for the WMI extensions (wireless and bluetooth power control) of the HP Compaq TC1100 tablet. +config HP_BIOSCFG + tristate "HP BIOS Configuration Driver" + default m + depends on ACPI_WMI + select NLS + select FW_ATTR_CLASS + help + This driver enables administrators to securely manage BIOS settings + using digital certificates and public-key cryptography that eliminate + the need for passwords for both remote and local management. It supports + changing BIOS settings on many HP machines from 2018 and newer without + the use of any additional software. + + To compile this driver as a module, choose M here: the module will + be called hp-bioscfg. + endif # X86_PLATFORM_DRIVERS_HP diff --git a/drivers/platform/x86/hp/Makefile b/drivers/platform/x86/hp/Makefile index db1eed4cd7c7..e4f908a61acf 100644 --- a/drivers/platform/x86/hp/Makefile +++ b/drivers/platform/x86/hp/Makefile @@ -8,3 +8,4 @@ obj-$(CONFIG_HP_ACCEL) += hp_accel.o obj-$(CONFIG_HP_WMI) += hp-wmi.o obj-$(CONFIG_TC1100_WMI) += tc1100-wmi.o +obj-$(CONFIG_HP_BIOSCFG) += hp-bioscfg/ diff --git a/drivers/platform/x86/hp/hp-bioscfg/Makefile b/drivers/platform/x86/hp/hp-bioscfg/Makefile new file mode 100644 index 000000000000..67be0d917753 --- /dev/null +++ b/drivers/platform/x86/hp/hp-bioscfg/Makefile @@ -0,0 +1,11 @@ +obj-$(CONFIG_HP_BIOSCFG) := hp-bioscfg.o + +hp-bioscfg-objs := bioscfg.o \ + biosattr-interface.o \ + enum-attributes.o \ + int-attributes.o \ + order-list-attributes.o \ + passwdobj-attributes.o \ + spmobj-attributes.o \ + string-attributes.o \ + surestart-attributes.o diff --git a/drivers/platform/x86/hp/hp-bioscfg/biosattr-interface.c b/drivers/platform/x86/hp/hp-bioscfg/biosattr-interface.c new file mode 100644 index 000000000000..dea54f35b8b5 --- /dev/null +++ b/drivers/platform/x86/hp/hp-bioscfg/biosattr-interface.c @@ -0,0 +1,312 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Functions corresponding to methods under BIOS interface GUID + * for use with hp-bioscfg driver. + * + * Copyright (c) 2022 Hewlett-Packard Inc. + */ + +#include <linux/wmi.h> +#include "bioscfg.h" + +/* + * struct bios_args buffer is dynamically allocated. New WMI command types + * were introduced that exceeds 128-byte data size. Changes to handle + * the data size allocation scheme were kept in hp_wmi_perform_query function. + */ +struct bios_args { + u32 signature; + u32 command; + u32 commandtype; + u32 datasize; + u8 data[]; +}; + +/** + * hp_set_attribute + * + * @a_name: The attribute name + * @a_value: The attribute value + * + * Sets an attribute to new value + * + * Returns zero on success + * -ENODEV if device is not found + * -EINVAL if the instance of 'Setup Admin' password is not found. + * -ENOMEM unable to allocate memory + */ +int hp_set_attribute(const char *a_name, const char *a_value) +{ + int security_area_size; + int a_name_size, a_value_size; + u16 *buffer = NULL; + u16 *start; + int buffer_size, instance, ret; + char *auth_token_choice; + + mutex_lock(&bioscfg_drv.mutex); + + instance = hp_get_password_instance_for_type(SETUP_PASSWD); + if (instance < 0) { + ret = -EINVAL; + goto out_set_attribute; + } + + /* Select which auth token to use; password or [auth token] */ + if (bioscfg_drv.spm_data.auth_token) + auth_token_choice = bioscfg_drv.spm_data.auth_token; + else + auth_token_choice = bioscfg_drv.password_data[instance].current_password; + + a_name_size = hp_calculate_string_buffer(a_name); + a_value_size = hp_calculate_string_buffer(a_value); + security_area_size = hp_calculate_security_buffer(auth_token_choice); + buffer_size = a_name_size + a_value_size + security_area_size; + + buffer = kmalloc(buffer_size + 1, GFP_KERNEL); + if (!buffer) { + ret = -ENOMEM; + goto out_set_attribute; + } + + /* build variables to set */ + start = buffer; + start = hp_ascii_to_utf16_unicode(start, a_name); + if (!start) { + ret = -EINVAL; + goto out_set_attribute; + } + + start = hp_ascii_to_utf16_unicode(start, a_value); + if (!start) { + ret = -EINVAL; + goto out_set_attribute; + } + + ret = hp_populate_security_buffer(start, auth_token_choice); + if (ret < 0) + goto out_set_attribute; + + ret = hp_wmi_set_bios_setting(buffer, buffer_size); + +out_set_attribute: + kfree(buffer); + mutex_unlock(&bioscfg_drv.mutex); + return ret; +} + +/** + * hp_wmi_perform_query + * + * @query: The commandtype (enum hp_wmi_commandtype) + * @command: The command (enum hp_wmi_command) + * @buffer: Buffer used as input and/or output + * @insize: Size of input buffer + * @outsize: Size of output buffer + * + * returns zero on success + * an HP WMI query specific error code (which is positive) + * -EINVAL if the query was not successful at all + * -EINVAL if the output buffer size exceeds buffersize + * + * Note: The buffersize must at least be the maximum of the input and output + * size. E.g. Battery info query is defined to have 1 byte input + * and 128 byte output. The caller would do: + * buffer = kzalloc(128, GFP_KERNEL); + * ret = hp_wmi_perform_query(HPWMI_BATTERY_QUERY, HPWMI_READ, + * buffer, 1, 128) + */ +int hp_wmi_perform_query(int query, enum hp_wmi_command command, void *buffer, + u32 insize, u32 outsize) +{ + struct acpi_buffer input, output = { ACPI_ALLOCATE_BUFFER, NULL }; + struct bios_return *bios_return; + union acpi_object *obj = NULL; + struct bios_args *args = NULL; + int mid, actual_outsize, ret; + size_t bios_args_size; + + mid = hp_encode_outsize_for_pvsz(outsize); + if (WARN_ON(mid < 0)) + return mid; + + bios_args_size = struct_size(args, data, insize); + args = kmalloc(bios_args_size, GFP_KERNEL); + if (!args) + return -ENOMEM; + + input.length = bios_args_size; + input.pointer = args; + + /* BIOS expects 'SECU' in hex as the signature value*/ + args->signature = 0x55434553; + args->command = command; + args->commandtype = query; + args->datasize = insize; + memcpy(args->data, buffer, flex_array_size(args, data, insize)); + + ret = wmi_evaluate_method(HP_WMI_BIOS_GUID, 0, mid, &input, &output); + if (ret) + goto out_free; + + obj = output.pointer; + if (!obj) { + ret = -EINVAL; + goto out_free; + } + + if (obj->type != ACPI_TYPE_BUFFER || + obj->buffer.length < sizeof(*bios_return)) { + pr_warn("query 0x%x returned wrong type or too small buffer\n", query); + ret = -EINVAL; + goto out_free; + } + + bios_return = (struct bios_return *)obj->buffer.pointer; + ret = bios_return->return_code; + if (ret) { + if (ret != INVALID_CMD_VALUE && ret != INVALID_CMD_TYPE) + pr_warn("query 0x%x returned error 0x%x\n", query, ret); + goto out_free; + } + + /* Ignore output data of zero size */ + if (!outsize) + goto out_free; + + actual_outsize = min_t(u32, outsize, obj->buffer.length - sizeof(*bios_return)); + memcpy_and_pad(buffer, outsize, obj->buffer.pointer + sizeof(*bios_return), + actual_outsize, 0); + +out_free: + ret = hp_wmi_error_and_message(ret); + + kfree(obj); + kfree(args); + return ret; +} + +static void *utf16_empty_string(u16 *p) +{ + *p++ = 2; + *p++ = 0x00; + return p; +} + +/** + * hp_ascii_to_utf16_unicode - Convert ascii string to UTF-16 unicode + * + * BIOS supports UTF-16 characters that are 2 bytes long. No variable + * multi-byte language supported. + * + * @p: Unicode buffer address + * @str: string to convert to unicode + * + * Returns a void pointer to the buffer string + */ +void *hp_ascii_to_utf16_unicode(u16 *p, const u8 *str) +{ + int len = strlen(str); + int ret; + + /* + * Add null character when reading an empty string + * "02 00 00 00" + */ + if (len == 0) + return utf16_empty_string(p); + + /* Move pointer len * 2 number of bytes */ + *p++ = len * 2; + ret = utf8s_to_utf16s(str, strlen(str), UTF16_HOST_ENDIAN, p, len); + if (ret < 0) { + dev_err(bioscfg_drv.class_dev, "UTF16 conversion failed\n"); + return NULL; + } + + if (ret * sizeof(u16) > U16_MAX) { + dev_err(bioscfg_drv.class_dev, "Error string too long\n"); + return NULL; + } + + p += len; + return p; +} + +/** + * hp_wmi_set_bios_setting - Set setting's value in BIOS + * + * @input_buffer: Input buffer address + * @input_size: Input buffer size + * + * Returns: Count of unicode characters written to BIOS if successful, otherwise + * -ENOMEM unable to allocate memory + * -EINVAL buffer not allocated or too small + */ +int hp_wmi_set_bios_setting(u16 *input_buffer, u32 input_size) +{ + union acpi_object *obj; + struct acpi_buffer input = {input_size, input_buffer}; + struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; + int ret; + + ret = wmi_evaluate_method(HP_WMI_SET_BIOS_SETTING_GUID, 0, 1, &input, &output); + + obj = output.pointer; + if (!obj) + return -EINVAL; + + if (obj->type != ACPI_TYPE_INTEGER) { + ret = -EINVAL; + goto out_free; + } + + ret = obj->integer.value; + if (ret) { + ret = hp_wmi_error_and_message(ret); + goto out_free; + } + +out_free: + kfree(obj); + return ret; +} + +static int hp_attr_set_interface_probe(struct wmi_device *wdev, const void *context) +{ + mutex_lock(&bioscfg_drv.mutex); + mutex_unlock(&bioscfg_drv.mutex); + return 0; +} + +static void hp_attr_set_interface_remove(struct wmi_device *wdev) +{ + mutex_lock(&bioscfg_drv.mutex); + mutex_unlock(&bioscfg_drv.mutex); +} + +static const struct wmi_device_id hp_attr_set_interface_id_table[] = { + { .guid_string = HP_WMI_BIOS_GUID}, + { } +}; + +static struct wmi_driver hp_attr_set_interface_driver = { + .driver = { + .name = DRIVER_NAME, + }, + .probe = hp_attr_set_interface_probe, + .remove = hp_attr_set_interface_remove, + .id_table = hp_attr_set_interface_id_table, +}; + +int hp_init_attr_set_interface(void) +{ + return wmi_driver_register(&hp_attr_set_interface_driver); +} + +void hp_exit_attr_set_interface(void) +{ + wmi_driver_unregister(&hp_attr_set_interface_driver); +} + +MODULE_DEVICE_TABLE(wmi, hp_attr_set_interface_id_table); diff --git a/drivers/platform/x86/hp/hp-bioscfg/bioscfg.c b/drivers/platform/x86/hp/hp-bioscfg/bioscfg.c new file mode 100644 index 000000000000..8c4f9e12f018 --- /dev/null +++ b/drivers/platform/x86/hp/hp-bioscfg/bioscfg.c @@ -0,0 +1,1063 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Common methods for use with hp-bioscfg driver + * + * Copyright (c) 2022 HP Development Company, L.P. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/fs.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/wmi.h> +#include "bioscfg.h" +#include "../../firmware_attributes_class.h" +#include <linux/nls.h> +#include <linux/errno.h> + +MODULE_AUTHOR("Jorge Lopez <jorge.lopez2@hp.com>"); +MODULE_DESCRIPTION("HP BIOS Configuration Driver"); +MODULE_LICENSE("GPL"); + +struct bioscfg_priv bioscfg_drv = { + .mutex = __MUTEX_INITIALIZER(bioscfg_drv.mutex), +}; + +static struct class *fw_attr_class; + +ssize_t display_name_language_code_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + return sysfs_emit(buf, "%s\n", LANG_CODE_STR); +} + +struct kobj_attribute common_display_langcode = + __ATTR_RO(display_name_language_code); + +int hp_get_integer_from_buffer(u8 **buffer, u32 *buffer_size, u32 *integer) +{ + int *ptr = PTR_ALIGN((int *)*buffer, sizeof(int)); + + /* Ensure there is enough space remaining to read the integer */ + if (*buffer_size < sizeof(int)) + return -EINVAL; + + *integer = *(ptr++); + *buffer = (u8 *)ptr; + *buffer_size -= sizeof(int); + + return 0; +} + +int hp_get_string_from_buffer(u8 **buffer, u32 *buffer_size, char *dst, u32 dst_size) +{ + u16 *src = (u16 *)*buffer; + u16 src_size; + + u16 size; + int i; + int conv_dst_size; + + if (*buffer_size < sizeof(u16)) + return -EINVAL; + + src_size = *(src++); + /* size value in u16 chars */ + size = src_size / sizeof(u16); + + /* Ensure there is enough space remaining to read and convert + * the string + */ + if (*buffer_size < src_size) + return -EINVAL; + + for (i = 0; i < size; i++) + if (src[i] == '\\' || + src[i] == '\r' || + src[i] == '\n' || + src[i] == '\t') + size++; + + /* + * Conversion is limited to destination string max number of + * bytes. + */ + conv_dst_size = size; + if (size > dst_size) + conv_dst_size = dst_size - 1; + + /* + * convert from UTF-16 unicode to ASCII + */ + utf16s_to_utf8s(src, src_size, UTF16_HOST_ENDIAN, dst, conv_dst_size); + dst[conv_dst_size] = 0; + + for (i = 0; i < conv_dst_size; i++) { + if (*src == '\\' || + *src == '\r' || + *src == '\n' || + *src == '\t') { + dst[i++] = '\\'; + if (i == conv_dst_size) + break; + } + + if (*src == '\r') + dst[i] = 'r'; + else if (*src == '\n') + dst[i] = 'n'; + else if (*src == '\t') + dst[i] = 't'; + else if (*src == '"') + dst[i] = '\''; + else + dst[i] = *src; + src++; + } + + *buffer = (u8 *)src; + *buffer_size -= size * sizeof(u16); + + return size; +} + +int hp_get_common_data_from_buffer(u8 **buffer_ptr, u32 *buffer_size, + struct common_data *common_data) +{ + int ret = 0; + int reqs; + + // PATH: + ret = hp_get_string_from_buffer(buffer_ptr, buffer_size, common_data->path, + sizeof(common_data->path)); + if (ret < 0) + goto common_exit; + + // IS_READONLY: + ret = hp_get_integer_from_buffer(buffer_ptr, buffer_size, + &common_data->is_readonly); + if (ret < 0) + goto common_exit; + + //DISPLAY_IN_UI: + ret = hp_get_integer_from_buffer(buffer_ptr, buffer_size, + &common_data->display_in_ui); + if (ret < 0) + goto common_exit; + + // REQUIRES_PHYSICAL_PRESENCE: + ret = hp_get_integer_from_buffer(buffer_ptr, buffer_size, + &common_data->requires_physical_presence); + if (ret < 0) + goto common_exit; + + // SEQUENCE: + ret = hp_get_integer_from_buffer(buffer_ptr, buffer_size, + &common_data->sequence); + if (ret < 0) + goto common_exit; + + // PREREQUISITES_SIZE: + ret = hp_get_integer_from_buffer(buffer_ptr, buffer_size, + &common_data->prerequisites_size); + if (ret < 0) + goto common_exit; + + if (common_data->prerequisites_size > MAX_PREREQUISITES_SIZE) { + /* Report a message and limit prerequisite size to maximum value */ + pr_warn("Prerequisites size value exceeded the maximum number of elements supported or data may be malformed\n"); + common_data->prerequisites_size = MAX_PREREQUISITES_SIZE; + } + + // PREREQUISITES: + for (reqs = 0; reqs < common_data->prerequisites_size; reqs++) { + ret = hp_get_string_from_buffer(buffer_ptr, buffer_size, + common_data->prerequisites[reqs], + sizeof(common_data->prerequisites[reqs])); + if (ret < 0) + break; + } + + // SECURITY_LEVEL: + ret = hp_get_integer_from_buffer(buffer_ptr, buffer_size, + &common_data->security_level); + +common_exit: + return ret; +} + +int hp_enforce_single_line_input(char *buf, size_t count) +{ + char *p; + + p = memchr(buf, '\n', count); + + if (p == buf + count - 1) + *p = '\0'; /* strip trailing newline */ + else if (p) + return -EINVAL; /* enforce single line input */ + + return 0; +} + +/* Set pending reboot value and generate KOBJ_NAME event */ +void hp_set_reboot_and_signal_event(void) +{ + bioscfg_drv.pending_reboot = true; + kobject_uevent(&bioscfg_drv.class_dev->kobj, KOBJ_CHANGE); +} + +/** + * hp_calculate_string_buffer() - determines size of string buffer for + * use with BIOS communication + * + * @str: the string to calculate based upon + */ +size_t hp_calculate_string_buffer(const char *str) +{ + size_t length = strlen(str); + + /* BIOS expects 4 bytes when an empty string is found */ + if (length == 0) + return 4; + + /* u16 length field + one UTF16 char for each input char */ + return sizeof(u16) + strlen(str) * sizeof(u16); +} + +int hp_wmi_error_and_message(int error_code) +{ + char *error_msg = NULL; + int ret; + + switch (error_code) { + case SUCCESS: + error_msg = "Success"; + ret = 0; + break; + case CMD_FAILED: + error_msg = "Command failed"; + ret = -EINVAL; + break; + case INVALID_SIGN: + error_msg = "Invalid signature"; + ret = -EINVAL; + break; + case INVALID_CMD_VALUE: + error_msg = "Invalid command value/Feature not supported"; + ret = -EOPNOTSUPP; + break; + case INVALID_CMD_TYPE: + error_msg = "Invalid command type"; + ret = -EINVAL; + break; + case INVALID_DATA_SIZE: + error_msg = "Invalid data size"; + ret = -EINVAL; + break; + case INVALID_CMD_PARAM: + error_msg = "Invalid command parameter"; + ret = -EINVAL; + break; + case ENCRYP_CMD_REQUIRED: + error_msg = "Secure/encrypted command required"; + ret = -EACCES; + break; + case NO_SECURE_SESSION: + error_msg = "No secure session established"; + ret = -EACCES; + break; + case SECURE_SESSION_FOUND: + error_msg = "Secure session already established"; + ret = -EACCES; + break; + case SECURE_SESSION_FAILED: + error_msg = "Secure session failed"; + ret = -EIO; + break; + case AUTH_FAILED: + error_msg = "Other permission/Authentication failed"; + ret = -EACCES; + break; + case INVALID_BIOS_AUTH: + error_msg = "Invalid BIOS administrator password"; + ret = -EINVAL; + break; + case NONCE_DID_NOT_MATCH: + error_msg = "Nonce did not match"; + ret = -EINVAL; + break; + case GENERIC_ERROR: + error_msg = "Generic/Other error"; + ret = -EIO; + break; + case BIOS_ADMIN_POLICY_NOT_MET: + error_msg = "BIOS Admin password does not meet password policy requirements"; + ret = -EINVAL; + break; + case BIOS_ADMIN_NOT_SET: + error_msg = "BIOS Setup password is not set"; + ret = -EPERM; + break; + case P21_NO_PROVISIONED: + error_msg = "P21 is not provisioned"; + ret = -EPERM; + break; + case P21_PROVISION_IN_PROGRESS: + error_msg = "P21 is already provisioned or provisioning is in progress and a signing key has already been sent"; + ret = -EINPROGRESS; + break; + case P21_IN_USE: + error_msg = "P21 in use (cannot deprovision)"; + ret = -EPERM; + break; + case HEP_NOT_ACTIVE: + error_msg = "HEP not activated"; + ret = -EPERM; + break; + case HEP_ALREADY_SET: + error_msg = "HEP Transport already set"; + ret = -EINVAL; + break; + case HEP_CHECK_STATE: + error_msg = "Check the current HEP state"; + ret = -EINVAL; + break; + default: + error_msg = "Generic/Other error"; + ret = -EIO; + break; + } + + if (error_code) + pr_warn_ratelimited("Returned error 0x%x, \"%s\"\n", error_code, error_msg); + + return ret; +} + +static ssize_t pending_reboot_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + return sysfs_emit(buf, "%d\n", bioscfg_drv.pending_reboot); +} + +static struct kobj_attribute pending_reboot = __ATTR_RO(pending_reboot); + +/* + * create_attributes_level_sysfs_files() - Creates pending_reboot attributes + */ +static int create_attributes_level_sysfs_files(void) +{ + return sysfs_create_file(&bioscfg_drv.main_dir_kset->kobj, + &pending_reboot.attr); +} + +static void attr_name_release(struct kobject *kobj) +{ + kfree(kobj); +} + +static const struct kobj_type attr_name_ktype = { + .release = attr_name_release, + .sysfs_ops = &kobj_sysfs_ops, +}; + +/** + * hp_get_wmiobj_pointer() - Get Content of WMI block for particular instance + * + * @instance_id: WMI instance ID + * @guid_string: WMI GUID (in str form) + * + * Fetches the content for WMI block (instance_id) under GUID (guid_string) + * Caller must kfree the return + */ +union acpi_object *hp_get_wmiobj_pointer(int instance_id, const char *guid_string) +{ + struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL }; + acpi_status status; + + status = wmi_query_block(guid_string, instance_id, &out); + return ACPI_SUCCESS(status) ? (union acpi_object *)out.pointer : NULL; +} + +/** + * hp_get_instance_count() - Compute total number of instances under guid_string + * + * @guid_string: WMI GUID (in string form) + */ +int hp_get_instance_count(const char *guid_string) +{ + union acpi_object *wmi_obj = NULL; + int i = 0; + + do { + kfree(wmi_obj); + wmi_obj = hp_get_wmiobj_pointer(i, guid_string); + i++; + } while (wmi_obj); + + return i - 1; +} + +/** + * hp_alloc_attributes_data() - Allocate attributes data for a particular type + * + * @attr_type: Attribute type to allocate + */ +static int hp_alloc_attributes_data(int attr_type) +{ + switch (attr_type) { + case HPWMI_STRING_TYPE: + return hp_alloc_string_data(); + + case HPWMI_INTEGER_TYPE: + return hp_alloc_integer_data(); + + case HPWMI_ENUMERATION_TYPE: + return hp_alloc_enumeration_data(); + + case HPWMI_ORDERED_LIST_TYPE: + return hp_alloc_ordered_list_data(); + + case HPWMI_PASSWORD_TYPE: + return hp_alloc_password_data(); + + default: + return 0; + } +} + +int hp_convert_hexstr_to_str(const char *input, u32 input_len, char **str, int *len) +{ + int ret = 0; + int new_len = 0; + char tmp[] = "0x00"; + char *new_str = NULL; + long ch; + int i; + + if (input_len <= 0 || !input || !str || !len) + return -EINVAL; + + *len = 0; + *str = NULL; + + new_str = kmalloc(input_len, GFP_KERNEL); + if (!new_str) + return -ENOMEM; + + for (i = 0; i < input_len; i += 5) { + strncpy(tmp, input + i, strlen(tmp)); + if (kstrtol(tmp, 16, &ch) == 0) { + // escape char + if (ch == '\\' || + ch == '\r' || + ch == '\n' || ch == '\t') { + if (ch == '\r') + ch = 'r'; + else if (ch == '\n') + ch = 'n'; + else if (ch == '\t') + ch = 't'; + new_str[new_len++] = '\\'; + } + new_str[new_len++] = ch; + if (ch == '\0') + break; + } + } + + if (new_len) { + new_str[new_len] = '\0'; + *str = krealloc(new_str, (new_len + 1) * sizeof(char), + GFP_KERNEL); + if (*str) + *len = new_len; + else + ret = -ENOMEM; + } else { + ret = -EFAULT; + } + + if (ret) + kfree(new_str); + return ret; +} + +/* map output size to the corresponding WMI method id */ +int hp_encode_outsize_for_pvsz(int outsize) +{ + if (outsize > 4096) + return -EINVAL; + if (outsize > 1024) + return 5; + if (outsize > 128) + return 4; + if (outsize > 4) + return 3; + if (outsize > 0) + return 2; + return 1; +} + +/* + * Update friendly display name for several attributes associated to + * 'Schedule Power-On' + */ +void hp_friendly_user_name_update(char *path, const char *attr_name, + char *attr_display, int attr_size) +{ + if (strstr(path, SCHEDULE_POWER_ON)) + snprintf(attr_display, attr_size, "%s - %s", SCHEDULE_POWER_ON, attr_name); + else + strscpy(attr_display, attr_name, attr_size); +} + +/** + * hp_update_attribute_permissions() - Update attributes permissions when + * isReadOnly value is 1 + * + * @is_readonly: bool value to indicate if it a readonly attribute. + * @current_val: kobj_attribute corresponding to attribute. + * + */ +void hp_update_attribute_permissions(bool is_readonly, struct kobj_attribute *current_val) +{ + current_val->attr.mode = is_readonly ? 0444 : 0644; +} + +/** + * destroy_attribute_objs() - Free a kset of kobjects + * @kset: The kset to destroy + * + * Fress kobjects created for each attribute_name under attribute type kset + */ +static void destroy_attribute_objs(struct kset *kset) +{ + struct kobject *pos, *next; + + list_for_each_entry_safe(pos, next, &kset->list, entry) + kobject_put(pos); +} + +/** + * release_attributes_data() - Clean-up all sysfs directories and files created + */ +static void release_attributes_data(void) +{ + mutex_lock(&bioscfg_drv.mutex); + + hp_exit_string_attributes(); + hp_exit_integer_attributes(); + hp_exit_enumeration_attributes(); + hp_exit_ordered_list_attributes(); + hp_exit_password_attributes(); + hp_exit_sure_start_attributes(); + hp_exit_secure_platform_attributes(); + + if (bioscfg_drv.authentication_dir_kset) { + destroy_attribute_objs(bioscfg_drv.authentication_dir_kset); + kset_unregister(bioscfg_drv.authentication_dir_kset); + bioscfg_drv.authentication_dir_kset = NULL; + } + if (bioscfg_drv.main_dir_kset) { + sysfs_remove_file(&bioscfg_drv.main_dir_kset->kobj, &pending_reboot.attr); + destroy_attribute_objs(bioscfg_drv.main_dir_kset); + kset_unregister(bioscfg_drv.main_dir_kset); + bioscfg_drv.main_dir_kset = NULL; + } + mutex_unlock(&bioscfg_drv.mutex); +} + +/** + * hp_add_other_attributes() - Initialize HP custom attributes not + * reported by BIOS and required to support Secure Platform and Sure + * Start. + * + * @attr_type: Custom HP attribute not reported by BIOS + * + * Initialize all 2 types of attributes: Platform and Sure Start + * object. Populates each attribute types respective properties + * under sysfs files. + * + * Returns zero(0) if successful. Otherwise, a negative value. + */ +static int hp_add_other_attributes(int attr_type) +{ + struct kobject *attr_name_kobj; + union acpi_object *obj = NULL; + int ret; + char *attr_name; + + mutex_lock(&bioscfg_drv.mutex); + + attr_name_kobj = kzalloc(sizeof(*attr_name_kobj), GFP_KERNEL); + if (!attr_name_kobj) { + ret = -ENOMEM; + goto err_other_attr_init; + } + + /* Check if attribute type is supported */ + switch (attr_type) { + case HPWMI_SECURE_PLATFORM_TYPE: + attr_name_kobj->kset = bioscfg_drv.authentication_dir_kset; + attr_name = SPM_STR; + break; + + case HPWMI_SURE_START_TYPE: + attr_name_kobj->kset = bioscfg_drv.main_dir_kset; + attr_name = SURE_START_STR; + break; + + default: + pr_err("Error: Unknown attr_type: %d\n", attr_type); + ret = -EINVAL; + goto err_other_attr_init; + } + + ret = kobject_init_and_add(attr_name_kobj, &attr_name_ktype, + NULL, "%s", attr_name); + if (ret) { + pr_err("Error encountered [%d]\n", ret); + kobject_put(attr_name_kobj); + goto err_other_attr_init; + } + + /* Populate attribute data */ + switch (attr_type) { + case HPWMI_SECURE_PLATFORM_TYPE: + ret = hp_populate_secure_platform_data(attr_name_kobj); + if (ret) + goto err_other_attr_init; + break; + + case HPWMI_SURE_START_TYPE: + ret = hp_populate_sure_start_data(attr_name_kobj); + if (ret) + goto err_other_attr_init; + break; + + default: + ret = -EINVAL; + goto err_other_attr_init; + } + + mutex_unlock(&bioscfg_drv.mutex); + return 0; + +err_other_attr_init: + mutex_unlock(&bioscfg_drv.mutex); + kfree(obj); + return ret; +} + +static int hp_init_bios_package_attribute(enum hp_wmi_data_type attr_type, + union acpi_object *obj, + const char *guid, int min_elements, + int instance_id) +{ + struct kobject *attr_name_kobj; + union acpi_object *elements; + struct kset *temp_kset; + + char *str_value = NULL; + int str_len; + int ret = 0; + + /* Take action appropriate to each ACPI TYPE */ + if (obj->package.count < min_elements) { + pr_err("ACPI-package does not have enough elements: %d < %d\n", + obj->package.count, min_elements); + goto pack_attr_exit; + } + + elements = obj->package.elements; + + /* sanity checking */ + if (elements[NAME].type != ACPI_TYPE_STRING) { + pr_debug("incorrect element type\n"); + goto pack_attr_exit; + } + if (strlen(elements[NAME].string.pointer) == 0) { + pr_debug("empty attribute found\n"); + goto pack_attr_exit; + } + + if (attr_type == HPWMI_PASSWORD_TYPE) + temp_kset = bioscfg_drv.authentication_dir_kset; + else + temp_kset = bioscfg_drv.main_dir_kset; + + /* convert attribute name to string */ + ret = hp_convert_hexstr_to_str(elements[NAME].string.pointer, + elements[NAME].string.length, + &str_value, &str_len); + + if (ret) { + pr_debug("Failed to populate integer package data. Error [0%0x]\n", + ret); + kfree(str_value); + return ret; + } + + /* All duplicate attributes found are ignored */ + if (kset_find_obj(temp_kset, str_value)) { + pr_debug("Duplicate attribute name found - %s\n", str_value); + goto pack_attr_exit; + } + + /* build attribute */ + attr_name_kobj = kzalloc(sizeof(*attr_name_kobj), GFP_KERNEL); + if (!attr_name_kobj) { + ret = -ENOMEM; + goto pack_attr_exit; + } + + attr_name_kobj->kset = temp_kset; + + ret = kobject_init_and_add(attr_name_kobj, &attr_name_ktype, + NULL, "%s", str_value); + + if (ret) { + kobject_put(attr_name_kobj); + goto pack_attr_exit; + } + + /* enumerate all of these attributes */ + switch (attr_type) { + case HPWMI_STRING_TYPE: + ret = hp_populate_string_package_data(elements, + instance_id, + attr_name_kobj); + break; + case HPWMI_INTEGER_TYPE: + ret = hp_populate_integer_package_data(elements, + instance_id, + attr_name_kobj); + break; + case HPWMI_ENUMERATION_TYPE: + ret = hp_populate_enumeration_package_data(elements, + instance_id, + attr_name_kobj); + break; + case HPWMI_ORDERED_LIST_TYPE: + ret = hp_populate_ordered_list_package_data(elements, + instance_id, + attr_name_kobj); + break; + case HPWMI_PASSWORD_TYPE: + ret = hp_populate_password_package_data(elements, + instance_id, + attr_name_kobj); + break; + default: + pr_debug("Unknown attribute type found: 0x%x\n", attr_type); + break; + } + +pack_attr_exit: + kfree(str_value); + return ret; +} + +static int hp_init_bios_buffer_attribute(enum hp_wmi_data_type attr_type, + union acpi_object *obj, + const char *guid, int min_elements, + int instance_id) +{ + struct kobject *attr_name_kobj; + struct kset *temp_kset; + char str[MAX_BUFF_SIZE]; + + char *temp_str = NULL; + char *str_value = NULL; + u8 *buffer_ptr = NULL; + int buffer_size; + int ret = 0; + + buffer_size = obj->buffer.length; + buffer_ptr = obj->buffer.pointer; + + ret = hp_get_string_from_buffer(&buffer_ptr, + &buffer_size, str, MAX_BUFF_SIZE); + + if (ret < 0) + goto buff_attr_exit; + + if (attr_type == HPWMI_PASSWORD_TYPE || + attr_type == HPWMI_SECURE_PLATFORM_TYPE) + temp_kset = bioscfg_drv.authentication_dir_kset; + else + temp_kset = bioscfg_drv.main_dir_kset; + + /* All duplicate attributes found are ignored */ + if (kset_find_obj(temp_kset, str)) { + pr_debug("Duplicate attribute name found - %s\n", str); + goto buff_attr_exit; + } + + /* build attribute */ + attr_name_kobj = kzalloc(sizeof(*attr_name_kobj), GFP_KERNEL); + if (!attr_name_kobj) { + ret = -ENOMEM; + goto buff_attr_exit; + } + + attr_name_kobj->kset = temp_kset; + + temp_str = str; + if (attr_type == HPWMI_SECURE_PLATFORM_TYPE) + temp_str = "SPM"; + + ret = kobject_init_and_add(attr_name_kobj, + &attr_name_ktype, NULL, "%s", temp_str); + if (ret) { + kobject_put(attr_name_kobj); + goto buff_attr_exit; + } + + /* enumerate all of these attributes */ + switch (attr_type) { + case HPWMI_STRING_TYPE: + ret = hp_populate_string_buffer_data(buffer_ptr, + &buffer_size, + instance_id, + attr_name_kobj); + break; + case HPWMI_INTEGER_TYPE: + ret = hp_populate_integer_buffer_data(buffer_ptr, + &buffer_size, + instance_id, + attr_name_kobj); + break; + case HPWMI_ENUMERATION_TYPE: + ret = hp_populate_enumeration_buffer_data(buffer_ptr, + &buffer_size, + instance_id, + attr_name_kobj); + break; + case HPWMI_ORDERED_LIST_TYPE: + ret = hp_populate_ordered_list_buffer_data(buffer_ptr, + &buffer_size, + instance_id, + attr_name_kobj); + break; + case HPWMI_PASSWORD_TYPE: + ret = hp_populate_password_buffer_data(buffer_ptr, + &buffer_size, + instance_id, + attr_name_kobj); + break; + default: + pr_debug("Unknown attribute type found: 0x%x\n", attr_type); + break; + } + +buff_attr_exit: + kfree(str_value); + return ret; +} + +/** + * hp_init_bios_attributes() - Initialize all attributes for a type + * @attr_type: The attribute type to initialize + * @guid: The WMI GUID associated with this type to initialize + * + * Initialize all 5 types of attributes: enumeration, integer, + * string, password, ordered list object. Populates each attribute types + * respective properties under sysfs files + */ +static int hp_init_bios_attributes(enum hp_wmi_data_type attr_type, const char *guid) +{ + union acpi_object *obj = NULL; + int min_elements; + + /* instance_id needs to be reset for each type GUID + * also, instance IDs are unique within GUID but not across + */ + int instance_id = 0; + int cur_instance_id = instance_id; + int ret = 0; + + ret = hp_alloc_attributes_data(attr_type); + if (ret) + return ret; + + switch (attr_type) { + case HPWMI_STRING_TYPE: + min_elements = STR_ELEM_CNT; + break; + case HPWMI_INTEGER_TYPE: + min_elements = INT_ELEM_CNT; + break; + case HPWMI_ENUMERATION_TYPE: + min_elements = ENUM_ELEM_CNT; + break; + case HPWMI_ORDERED_LIST_TYPE: + min_elements = ORD_ELEM_CNT; + break; + case HPWMI_PASSWORD_TYPE: + min_elements = PSWD_ELEM_CNT; + break; + default: + pr_err("Error: Unknown attr_type: %d\n", attr_type); + return -EINVAL; + } + + /* need to use specific instance_id and guid combination to get right data */ + obj = hp_get_wmiobj_pointer(instance_id, guid); + if (!obj) + return -ENODEV; + + mutex_lock(&bioscfg_drv.mutex); + while (obj) { + /* Take action appropriate to each ACPI TYPE */ + if (obj->type == ACPI_TYPE_PACKAGE) { + ret = hp_init_bios_package_attribute(attr_type, obj, + guid, min_elements, + cur_instance_id); + + } else if (obj->type == ACPI_TYPE_BUFFER) { + ret = hp_init_bios_buffer_attribute(attr_type, obj, + guid, min_elements, + cur_instance_id); + + } else { + pr_err("Expected ACPI-package or buffer type, got: %d\n", + obj->type); + ret = -EIO; + goto err_attr_init; + } + + /* + * Failure reported in one attribute must not + * stop process of the remaining attribute values. + */ + if (ret >= 0) + cur_instance_id++; + + kfree(obj); + instance_id++; + obj = hp_get_wmiobj_pointer(instance_id, guid); + } + +err_attr_init: + mutex_unlock(&bioscfg_drv.mutex); + kfree(obj); + return ret; +} + +static int __init hp_init(void) +{ + int ret; + int hp_bios_capable = wmi_has_guid(HP_WMI_BIOS_GUID); + int set_bios_settings = wmi_has_guid(HP_WMI_SET_BIOS_SETTING_GUID); + + if (!hp_bios_capable) { + pr_err("Unable to run on non-HP system\n"); + return -ENODEV; + } + + if (!set_bios_settings) { + pr_err("Unable to set BIOS settings on HP systems\n"); + return -ENODEV; + } + + ret = hp_init_attr_set_interface(); + if (ret) + return ret; + + ret = fw_attributes_class_get(&fw_attr_class); + if (ret) + goto err_unregister_class; + + bioscfg_drv.class_dev = device_create(fw_attr_class, NULL, MKDEV(0, 0), + NULL, "%s", DRIVER_NAME); + if (IS_ERR(bioscfg_drv.class_dev)) { + ret = PTR_ERR(bioscfg_drv.class_dev); + goto err_unregister_class; + } + + bioscfg_drv.main_dir_kset = kset_create_and_add("attributes", NULL, + &bioscfg_drv.class_dev->kobj); + if (!bioscfg_drv.main_dir_kset) { + ret = -ENOMEM; + pr_debug("Failed to create and add attributes\n"); + goto err_destroy_classdev; + } + + bioscfg_drv.authentication_dir_kset = kset_create_and_add("authentication", NULL, + &bioscfg_drv.class_dev->kobj); + if (!bioscfg_drv.authentication_dir_kset) { + ret = -ENOMEM; + pr_debug("Failed to create and add authentication\n"); + goto err_release_attributes_data; + } + + /* + * sysfs level attributes. + * - pending_reboot + */ + ret = create_attributes_level_sysfs_files(); + if (ret) + pr_debug("Failed to create sysfs level attributes\n"); + + ret = hp_init_bios_attributes(HPWMI_STRING_TYPE, HP_WMI_BIOS_STRING_GUID); + if (ret) + pr_debug("Failed to populate string type attributes\n"); + + ret = hp_init_bios_attributes(HPWMI_INTEGER_TYPE, HP_WMI_BIOS_INTEGER_GUID); + if (ret) + pr_debug("Failed to populate integer type attributes\n"); + + ret = hp_init_bios_attributes(HPWMI_ENUMERATION_TYPE, HP_WMI_BIOS_ENUMERATION_GUID); + if (ret) + pr_debug("Failed to populate enumeration type attributes\n"); + + ret = hp_init_bios_attributes(HPWMI_ORDERED_LIST_TYPE, HP_WMI_BIOS_ORDERED_LIST_GUID); + if (ret) + pr_debug("Failed to populate ordered list object type attributes\n"); + + ret = hp_init_bios_attributes(HPWMI_PASSWORD_TYPE, HP_WMI_BIOS_PASSWORD_GUID); + if (ret) + pr_debug("Failed to populate password object type attributes\n"); + + bioscfg_drv.spm_data.attr_name_kobj = NULL; + ret = hp_add_other_attributes(HPWMI_SECURE_PLATFORM_TYPE); + if (ret) + pr_debug("Failed to populate secure platform object type attribute\n"); + + bioscfg_drv.sure_start_attr_kobj = NULL; + ret = hp_add_other_attributes(HPWMI_SURE_START_TYPE); + if (ret) + pr_debug("Failed to populate sure start object type attribute\n"); + + return 0; + +err_release_attributes_data: + release_attributes_data(); + +err_destroy_classdev: + device_destroy(fw_attr_class, MKDEV(0, 0)); + +err_unregister_class: + fw_attributes_class_put(); + hp_exit_attr_set_interface(); + + return ret; +} + +static void __exit hp_exit(void) +{ + release_attributes_data(); + device_destroy(fw_attr_class, MKDEV(0, 0)); + + fw_attributes_class_put(); + hp_exit_attr_set_interface(); +} + +module_init(hp_init); +module_exit(hp_exit); diff --git a/drivers/platform/x86/hp/hp-bioscfg/bioscfg.h b/drivers/platform/x86/hp/hp-bioscfg/bioscfg.h new file mode 100644 index 000000000000..3166ef328eba --- /dev/null +++ b/drivers/platform/x86/hp/hp-bioscfg/bioscfg.h @@ -0,0 +1,487 @@ +/* SPDX-License-Identifier: GPL-2.0 + * + * Definitions for kernel modules using hp_bioscfg driver + * + * Copyright (c) 2022 HP Development Company, L.P. + */ + +#ifndef _HP_BIOSCFG_H_ +#define _HP_BIOSCFG_H_ + +#include <linux/wmi.h> +#include <linux/types.h> +#include <linux/device.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/nls.h> + +#define DRIVER_NAME "hp-bioscfg" + +#define MAX_BUFF_SIZE 512 +#define MAX_KEY_MOD_SIZE 256 +#define MAX_PASSWD_SIZE 64 +#define MAX_PREREQUISITES_SIZE 20 +#define MAX_REQ_ELEM_SIZE 128 +#define MAX_VALUES_SIZE 16 +#define MAX_ENCODINGS_SIZE 16 +#define MAX_ELEMENTS_SIZE 16 + +#define SPM_STR_DESC "Secure Platform Management" +#define SPM_STR "SPM" +#define SURE_START_DESC "Sure Start" +#define SURE_START_STR "Sure_Start" +#define SETUP_PASSWD "Setup Password" +#define POWER_ON_PASSWD "Power-On Password" + +#define LANG_CODE_STR "en_US.UTF-8" +#define SCHEDULE_POWER_ON "Scheduled Power-On" + +#define COMMA_SEP "," +#define SEMICOLON_SEP ";" + +/* Sure Admin Functions */ + +#define UTF_PREFIX "<utf-16/>" +#define BEAM_PREFIX "<BEAM/>" + +enum mechanism_values { + PASSWORD = 0x00, + SIGNING_KEY = 0x01, + ENDORSEMENT_KEY = 0x02, +}; + +#define BIOS_ADMIN "bios-admin" +#define POWER_ON "power-on" +#define BIOS_SPM "enhanced-bios-auth" + +#define PASSWD_MECHANISM_TYPES "password" + +#define HP_WMI_BIOS_GUID "5FB7F034-2C63-45e9-BE91-3D44E2C707E4" + +#define HP_WMI_BIOS_STRING_GUID "988D08E3-68F4-4c35-AF3E-6A1B8106F83C" +#define HP_WMI_BIOS_INTEGER_GUID "8232DE3D-663D-4327-A8F4-E293ADB9BF05" +#define HP_WMI_BIOS_ENUMERATION_GUID "2D114B49-2DFB-4130-B8FE-4A3C09E75133" +#define HP_WMI_BIOS_ORDERED_LIST_GUID "14EA9746-CE1F-4098-A0E0-7045CB4DA745" +#define HP_WMI_BIOS_PASSWORD_GUID "322F2028-0F84-4901-988E-015176049E2D" +#define HP_WMI_SET_BIOS_SETTING_GUID "1F4C91EB-DC5C-460b-951D-C7CB9B4B8D5E" + +enum hp_wmi_spm_commandtype { + HPWMI_SECUREPLATFORM_GET_STATE = 0x10, + HPWMI_SECUREPLATFORM_SET_KEK = 0x11, + HPWMI_SECUREPLATFORM_SET_SK = 0x12, +}; + +enum hp_wmi_surestart_commandtype { + HPWMI_SURESTART_GET_LOG_COUNT = 0x01, + HPWMI_SURESTART_GET_LOG = 0x02, +}; + +enum hp_wmi_command { + HPWMI_READ = 0x01, + HPWMI_WRITE = 0x02, + HPWMI_ODM = 0x03, + HPWMI_SURESTART = 0x20006, + HPWMI_GM = 0x20008, + HPWMI_SECUREPLATFORM = 0x20010, +}; + +struct bios_return { + u32 sigpass; + u32 return_code; +}; + +enum wmi_error_values { + SUCCESS = 0x00, + CMD_FAILED = 0x01, + INVALID_SIGN = 0x02, + INVALID_CMD_VALUE = 0x03, + INVALID_CMD_TYPE = 0x04, + INVALID_DATA_SIZE = 0x05, + INVALID_CMD_PARAM = 0x06, + ENCRYP_CMD_REQUIRED = 0x07, + NO_SECURE_SESSION = 0x08, + SECURE_SESSION_FOUND = 0x09, + SECURE_SESSION_FAILED = 0x0A, + AUTH_FAILED = 0x0B, + INVALID_BIOS_AUTH = 0x0E, + NONCE_DID_NOT_MATCH = 0x18, + GENERIC_ERROR = 0x1C, + BIOS_ADMIN_POLICY_NOT_MET = 0x28, + BIOS_ADMIN_NOT_SET = 0x38, + P21_NO_PROVISIONED = 0x1000, + P21_PROVISION_IN_PROGRESS = 0x1001, + P21_IN_USE = 0x1002, + HEP_NOT_ACTIVE = 0x1004, + HEP_ALREADY_SET = 0x1006, + HEP_CHECK_STATE = 0x1007, +}; + +struct common_data { + u8 display_name[MAX_BUFF_SIZE]; + u8 path[MAX_BUFF_SIZE]; + u32 is_readonly; + u32 display_in_ui; + u32 requires_physical_presence; + u32 sequence; + u32 prerequisites_size; + u8 prerequisites[MAX_PREREQUISITES_SIZE][MAX_BUFF_SIZE]; + u32 security_level; +}; + +struct string_data { + struct common_data common; + struct kobject *attr_name_kobj; + u8 current_value[MAX_BUFF_SIZE]; + u8 new_value[MAX_BUFF_SIZE]; + u32 min_length; + u32 max_length; +}; + +struct integer_data { + struct common_data common; + struct kobject *attr_name_kobj; + u32 current_value; + u32 new_value; + u32 lower_bound; + u32 upper_bound; + u32 scalar_increment; +}; + +struct enumeration_data { + struct common_data common; + struct kobject *attr_name_kobj; + u8 current_value[MAX_BUFF_SIZE]; + u8 new_value[MAX_BUFF_SIZE]; + u32 possible_values_size; + u8 possible_values[MAX_VALUES_SIZE][MAX_BUFF_SIZE]; +}; + +struct ordered_list_data { + struct common_data common; + struct kobject *attr_name_kobj; + u8 current_value[MAX_BUFF_SIZE]; + u8 new_value[MAX_BUFF_SIZE]; + u32 elements_size; + u8 elements[MAX_ELEMENTS_SIZE][MAX_BUFF_SIZE]; +}; + +struct password_data { + struct common_data common; + struct kobject *attr_name_kobj; + u8 current_password[MAX_PASSWD_SIZE]; + u8 new_password[MAX_PASSWD_SIZE]; + u32 min_password_length; + u32 max_password_length; + u32 encodings_size; + u8 encodings[MAX_ENCODINGS_SIZE][MAX_BUFF_SIZE]; + bool is_enabled; + + /* + * 'role' identifies the type of authentication. + * Two known types are bios-admin and power-on. + * 'bios-admin' represents BIOS administrator password + * 'power-on' represents a password required to use the system + */ + u32 role; + + /* + * 'mechanism' represents the means of authentication. + * Only supported type currently is "password" + */ + u32 mechanism; +}; + +struct secure_platform_data { + struct kobject *attr_name_kobj; + u8 attribute_name[MAX_BUFF_SIZE]; + u8 *endorsement_key; + u8 *signing_key; + u8 *auth_token; + bool is_enabled; + u32 mechanism; +}; + +struct bioscfg_priv { + struct kset *authentication_dir_kset; + struct kset *main_dir_kset; + struct device *class_dev; + struct string_data *string_data; + u32 string_instances_count; + struct integer_data *integer_data; + u32 integer_instances_count; + struct enumeration_data *enumeration_data; + u32 enumeration_instances_count; + struct ordered_list_data *ordered_list_data; + u32 ordered_list_instances_count; + struct password_data *password_data; + u32 password_instances_count; + + struct kobject *sure_start_attr_kobj; + struct secure_platform_data spm_data; + u8 display_name_language_code[MAX_BUFF_SIZE]; + bool pending_reboot; + struct mutex mutex; +}; + +/* global structure used by multiple WMI interfaces */ +extern struct bioscfg_priv bioscfg_drv; + +enum hp_wmi_data_type { + HPWMI_STRING_TYPE, + HPWMI_INTEGER_TYPE, + HPWMI_ENUMERATION_TYPE, + HPWMI_ORDERED_LIST_TYPE, + HPWMI_PASSWORD_TYPE, + HPWMI_SECURE_PLATFORM_TYPE, + HPWMI_SURE_START_TYPE, +}; + +enum hp_wmi_data_elements { + /* Common elements */ + NAME = 0, + VALUE = 1, + PATH = 2, + IS_READONLY = 3, + DISPLAY_IN_UI = 4, + REQUIRES_PHYSICAL_PRESENCE = 5, + SEQUENCE = 6, + PREREQUISITES_SIZE = 7, + PREREQUISITES = 8, + SECURITY_LEVEL = 9, + + /* String elements */ + STR_MIN_LENGTH = 10, + STR_MAX_LENGTH = 11, + STR_ELEM_CNT = 12, + + /* Integer elements */ + INT_LOWER_BOUND = 10, + INT_UPPER_BOUND = 11, + INT_SCALAR_INCREMENT = 12, + INT_ELEM_CNT = 13, + + /* Enumeration elements */ + ENUM_CURRENT_VALUE = 10, + ENUM_SIZE = 11, + ENUM_POSSIBLE_VALUES = 12, + ENUM_ELEM_CNT = 13, + + /* Ordered list elements */ + ORD_LIST_SIZE = 10, + ORD_LIST_ELEMENTS = 11, + ORD_ELEM_CNT = 12, + + /* Password elements */ + PSWD_MIN_LENGTH = 10, + PSWD_MAX_LENGTH = 11, + PSWD_SIZE = 12, + PSWD_ENCODINGS = 13, + PSWD_IS_SET = 14, + PSWD_ELEM_CNT = 15, +}; + +#define GET_INSTANCE_ID(type) \ + static int get_##type##_instance_id(struct kobject *kobj) \ + { \ + int i; \ + \ + for (i = 0; i <= bioscfg_drv.type##_instances_count; i++) { \ + if (!strcmp(kobj->name, bioscfg_drv.type##_data[i].attr_name_kobj->name)) \ + return i; \ + } \ + return -EIO; \ + } + +#define ATTRIBUTE_S_PROPERTY_SHOW(name, type) \ + static ssize_t name##_show(struct kobject *kobj, struct kobj_attribute *attr, \ + char *buf) \ + { \ + int i = get_##type##_instance_id(kobj); \ + if (i >= 0) \ + return sysfs_emit(buf, "%s\n", bioscfg_drv.type##_data[i].name); \ + return -EIO; \ + } + +#define ATTRIBUTE_N_PROPERTY_SHOW(name, type) \ + static ssize_t name##_show(struct kobject *kobj, struct kobj_attribute *attr, \ + char *buf) \ + { \ + int i = get_##type##_instance_id(kobj); \ + if (i >= 0) \ + return sysfs_emit(buf, "%d\n", bioscfg_drv.type##_data[i].name); \ + return -EIO; \ + } + +#define ATTRIBUTE_PROPERTY_STORE(curr_val, type) \ + static ssize_t curr_val##_store(struct kobject *kobj, \ + struct kobj_attribute *attr, \ + const char *buf, size_t count) \ + { \ + char *attr_value = NULL; \ + int i; \ + int ret = -EIO; \ + \ + attr_value = kstrdup(buf, GFP_KERNEL); \ + if (!attr_value) \ + return -ENOMEM; \ + \ + ret = hp_enforce_single_line_input(attr_value, count); \ + if (!ret) { \ + i = get_##type##_instance_id(kobj); \ + if (i >= 0) \ + ret = validate_##type##_input(i, attr_value); \ + } \ + if (!ret) \ + ret = hp_set_attribute(kobj->name, attr_value); \ + if (!ret) { \ + update_##type##_value(i, attr_value); \ + if (bioscfg_drv.type##_data[i].common.requires_physical_presence) \ + hp_set_reboot_and_signal_event(); \ + } \ + hp_clear_all_credentials(); \ + kfree(attr_value); \ + \ + return ret ? ret : count; \ + } + +#define ATTRIBUTE_SPM_N_PROPERTY_SHOW(name, type) \ + static ssize_t name##_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) \ + { \ + return sysfs_emit(buf, "%d\n", bioscfg_drv.type##_data.name); \ + } + +#define ATTRIBUTE_SPM_S_PROPERTY_SHOW(name, type) \ + static ssize_t name##_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) \ + { \ + return sysfs_emit(buf, "%s\n", bioscfg_drv.type##_data.name); \ + } + +#define ATTRIBUTE_VALUES_PROPERTY_SHOW(name, type, sep) \ + static ssize_t name##_show(struct kobject *kobj, \ + struct kobj_attribute *attr, char *buf) \ + { \ + int i; \ + int len = 0; \ + int instance_id = get_##type##_instance_id(kobj); \ + \ + if (instance_id < 0) \ + return 0; \ + \ + for (i = 0; i < bioscfg_drv.type##_data[instance_id].name##_size; i++) { \ + if (i) \ + len += sysfs_emit_at(buf, len, "%s", sep); \ + \ + len += sysfs_emit_at(buf, len, "%s", \ + bioscfg_drv.type##_data[instance_id].name[i]); \ + } \ + len += sysfs_emit_at(buf, len, "\n"); \ + return len; \ + } + +#define ATTRIBUTE_S_COMMON_PROPERTY_SHOW(name, type) \ + static ssize_t name##_show(struct kobject *kobj, struct kobj_attribute *attr, \ + char *buf) \ + { \ + int i = get_##type##_instance_id(kobj); \ + if (i >= 0) \ + return sysfs_emit(buf, "%s\n", bioscfg_drv.type##_data[i].common.name); \ + return -EIO; \ + } + +extern struct kobj_attribute common_display_langcode; + +/* Prototypes */ + +/* String attributes */ +int hp_populate_string_buffer_data(u8 *buffer_ptr, u32 *buffer_size, + int instance_id, + struct kobject *attr_name_kobj); +int hp_alloc_string_data(void); +void hp_exit_string_attributes(void); +int hp_populate_string_package_data(union acpi_object *str_obj, + int instance_id, + struct kobject *attr_name_kobj); + +/* Integer attributes */ +int hp_populate_integer_buffer_data(u8 *buffer_ptr, u32 *buffer_size, + int instance_id, + struct kobject *attr_name_kobj); +int hp_alloc_integer_data(void); +void hp_exit_integer_attributes(void); +int hp_populate_integer_package_data(union acpi_object *integer_obj, + int instance_id, + struct kobject *attr_name_kobj); + +/* Enumeration attributes */ +int hp_populate_enumeration_buffer_data(u8 *buffer_ptr, u32 *buffer_size, + int instance_id, + struct kobject *attr_name_kobj); +int hp_alloc_enumeration_data(void); +void hp_exit_enumeration_attributes(void); +int hp_populate_enumeration_package_data(union acpi_object *enum_obj, + int instance_id, + struct kobject *attr_name_kobj); + +/* Ordered list */ +int hp_populate_ordered_list_buffer_data(u8 *buffer_ptr, + u32 *buffer_size, + int instance_id, + struct kobject *attr_name_kobj); +int hp_alloc_ordered_list_data(void); +void hp_exit_ordered_list_attributes(void); +int hp_populate_ordered_list_package_data(union acpi_object *order_obj, + int instance_id, + struct kobject *attr_name_kobj); + +/* Password authentication attributes */ +int hp_populate_password_buffer_data(u8 *buffer_ptr, u32 *buffer_size, + int instance_id, + struct kobject *attr_name_kobj); +int hp_populate_password_package_data(union acpi_object *password_obj, + int instance_id, + struct kobject *attr_name_kobj); +int hp_alloc_password_data(void); +int hp_get_password_instance_for_type(const char *name); +int hp_clear_all_credentials(void); +int hp_set_attribute(const char *a_name, const char *a_value); + +/* SPM attributes */ +void hp_exit_password_attributes(void); +void hp_exit_secure_platform_attributes(void); +int hp_populate_secure_platform_data(struct kobject *attr_name_kobj); +int hp_populate_security_buffer(u16 *buffer, const char *authentication); + +/* Bios Attributes interface */ +int hp_wmi_set_bios_setting(u16 *input_buffer, u32 input_size); +int hp_wmi_perform_query(int query, enum hp_wmi_command command, + void *buffer, u32 insize, u32 outsize); + +/* Sure Start attributes */ +void hp_exit_sure_start_attributes(void); +int hp_populate_sure_start_data(struct kobject *attr_name_kobj); + +/* Bioscfg */ + +void hp_exit_attr_set_interface(void); +int hp_init_attr_set_interface(void); +size_t hp_calculate_string_buffer(const char *str); +size_t hp_calculate_security_buffer(const char *authentication); +void *hp_ascii_to_utf16_unicode(u16 *p, const u8 *str); +int hp_get_integer_from_buffer(u8 **buffer, u32 *buffer_size, u32 *integer); +int hp_get_string_from_buffer(u8 **buffer, u32 *buffer_size, char *dst, u32 dst_size); +int hp_convert_hexstr_to_str(const char *input, u32 input_len, char **str, int *len); +int hp_encode_outsize_for_pvsz(int outsize); +int hp_enforce_single_line_input(char *buf, size_t count); +void hp_set_reboot_and_signal_event(void); +ssize_t display_name_language_code_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf); +union acpi_object *hp_get_wmiobj_pointer(int instance_id, const char *guid_string); +int hp_get_instance_count(const char *guid_string); +void hp_update_attribute_permissions(bool isreadonly, struct kobj_attribute *current_val); +void hp_friendly_user_name_update(char *path, const char *attr_name, + char *attr_display, int attr_size); +int hp_wmi_error_and_message(int error_code); +int hp_get_common_data_from_buffer(u8 **buffer_ptr, u32 *buffer_size, struct common_data *common); + +#endif diff --git a/drivers/platform/x86/hp/hp-bioscfg/enum-attributes.c b/drivers/platform/x86/hp/hp-bioscfg/enum-attributes.c new file mode 100644 index 000000000000..a2402d31c146 --- /dev/null +++ b/drivers/platform/x86/hp/hp-bioscfg/enum-attributes.c @@ -0,0 +1,457 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Functions corresponding to enumeration type attributes under + * BIOS Enumeration GUID for use with hp-bioscfg driver. + * + * Copyright (c) 2022 HP Development Company, L.P. + */ + +#include "bioscfg.h" + +GET_INSTANCE_ID(enumeration); + +static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) +{ + int instance_id = get_enumeration_instance_id(kobj); + + if (instance_id < 0) + return -EIO; + + return sysfs_emit(buf, "%s\n", + bioscfg_drv.enumeration_data[instance_id].current_value); +} + +/** + * validate_enumeration_input() - + * Validate input of current_value against possible values + * + * @instance_id: The instance on which input is validated + * @buf: Input value + */ +static int validate_enumeration_input(int instance_id, const char *buf) +{ + int i; + int found = 0; + struct enumeration_data *enum_data = &bioscfg_drv.enumeration_data[instance_id]; + + /* Is it a read only attribute */ + if (enum_data->common.is_readonly) + return -EIO; + + for (i = 0; i < enum_data->possible_values_size && !found; i++) + if (!strcmp(enum_data->possible_values[i], buf)) + found = 1; + + if (!found) + return -EINVAL; + + return 0; +} + +static void update_enumeration_value(int instance_id, char *attr_value) +{ + struct enumeration_data *enum_data = &bioscfg_drv.enumeration_data[instance_id]; + + strscpy(enum_data->current_value, + attr_value, + sizeof(enum_data->current_value)); +} + +ATTRIBUTE_S_COMMON_PROPERTY_SHOW(display_name, enumeration); +static struct kobj_attribute enumeration_display_name = + __ATTR_RO(display_name); + +ATTRIBUTE_PROPERTY_STORE(current_value, enumeration); +static struct kobj_attribute enumeration_current_val = + __ATTR_RW(current_value); + +ATTRIBUTE_VALUES_PROPERTY_SHOW(possible_values, enumeration, SEMICOLON_SEP); +static struct kobj_attribute enumeration_poss_val = + __ATTR_RO(possible_values); + +static ssize_t type_show(struct kobject *kobj, struct kobj_attribute *attr, + char *buf) +{ + return sysfs_emit(buf, "enumeration\n"); +} + +static struct kobj_attribute enumeration_type = + __ATTR_RO(type); + +static struct attribute *enumeration_attrs[] = { + &common_display_langcode.attr, + &enumeration_display_name.attr, + &enumeration_current_val.attr, + &enumeration_poss_val.attr, + &enumeration_type.attr, + NULL +}; + +static const struct attribute_group enumeration_attr_group = { + .attrs = enumeration_attrs, +}; + +int hp_alloc_enumeration_data(void) +{ + bioscfg_drv.enumeration_instances_count = + hp_get_instance_count(HP_WMI_BIOS_ENUMERATION_GUID); + + bioscfg_drv.enumeration_data = kcalloc(bioscfg_drv.enumeration_instances_count, + sizeof(*bioscfg_drv.enumeration_data), GFP_KERNEL); + if (!bioscfg_drv.enumeration_data) { + bioscfg_drv.enumeration_instances_count = 0; + return -ENOMEM; + } + return 0; +} + +/* Expected Values types associated with each element */ +static const acpi_object_type expected_enum_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, + [ENUM_CURRENT_VALUE] = ACPI_TYPE_STRING, + [ENUM_SIZE] = ACPI_TYPE_INTEGER, + [ENUM_POSSIBLE_VALUES] = ACPI_TYPE_STRING, +}; + +static int hp_populate_enumeration_elements_from_package(union acpi_object *enum_obj, + int enum_obj_count, + int instance_id) +{ + char *str_value = NULL; + int value_len; + u32 size = 0; + u32 int_value = 0; + int elem = 0; + int reqs; + int pos_values; + int ret; + int eloc; + struct enumeration_data *enum_data = &bioscfg_drv.enumeration_data[instance_id]; + + for (elem = 1, eloc = 1; elem < enum_obj_count; elem++, eloc++) { + /* ONLY look at the first ENUM_ELEM_CNT elements */ + if (eloc == ENUM_ELEM_CNT) + goto exit_enumeration_package; + + switch (enum_obj[elem].type) { + case ACPI_TYPE_STRING: + if (PREREQUISITES != elem && ENUM_POSSIBLE_VALUES != elem) { + ret = hp_convert_hexstr_to_str(enum_obj[elem].string.pointer, + enum_obj[elem].string.length, + &str_value, &value_len); + if (ret) + return -EINVAL; + } + break; + case ACPI_TYPE_INTEGER: + int_value = (u32)enum_obj[elem].integer.value; + break; + default: + pr_warn("Unsupported object type [%d]\n", enum_obj[elem].type); + continue; + } + + /* Check that both expected and read object type match */ + if (expected_enum_types[eloc] != enum_obj[elem].type) { + pr_err("Error expected type %d for elem %d, but got type %d instead\n", + expected_enum_types[eloc], elem, enum_obj[elem].type); + kfree(str_value); + return -EIO; + } + + /* Assign appropriate element value to corresponding field */ + switch (eloc) { + case NAME: + case VALUE: + break; + case PATH: + strscpy(enum_data->common.path, str_value, + sizeof(enum_data->common.path)); + break; + case IS_READONLY: + enum_data->common.is_readonly = int_value; + break; + case DISPLAY_IN_UI: + enum_data->common.display_in_ui = int_value; + break; + case REQUIRES_PHYSICAL_PRESENCE: + enum_data->common.requires_physical_presence = int_value; + break; + case SEQUENCE: + enum_data->common.sequence = int_value; + break; + case PREREQUISITES_SIZE: + if (int_value > MAX_PREREQUISITES_SIZE) { + pr_warn("Prerequisites size value exceeded the maximum number of elements supported or data may be malformed\n"); + int_value = MAX_PREREQUISITES_SIZE; + } + enum_data->common.prerequisites_size = int_value; + + /* + * This step 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 = min_t(u32, enum_data->common.prerequisites_size, MAX_PREREQUISITES_SIZE); + for (reqs = 0; reqs < size; reqs++) { + if (elem >= enum_obj_count) { + pr_err("Error enum-objects package is too small\n"); + return -EINVAL; + } + + ret = hp_convert_hexstr_to_str(enum_obj[elem + reqs].string.pointer, + enum_obj[elem + reqs].string.length, + &str_value, &value_len); + + if (ret) + return -EINVAL; + + strscpy(enum_data->common.prerequisites[reqs], + str_value, + sizeof(enum_data->common.prerequisites[reqs])); + + kfree(str_value); + str_value = NULL; + } + break; + + case SECURITY_LEVEL: + enum_data->common.security_level = int_value; + break; + + case ENUM_CURRENT_VALUE: + strscpy(enum_data->current_value, + str_value, sizeof(enum_data->current_value)); + break; + case ENUM_SIZE: + if (int_value > MAX_VALUES_SIZE) { + pr_warn("Possible number values size value exceeded the maximum number of elements supported or data may be malformed\n"); + int_value = MAX_VALUES_SIZE; + } + enum_data->possible_values_size = int_value; + + /* + * This step is needed to keep the expected + * element list pointing to the right obj[elem].type + * when the size is zero. POSSIBLE_VALUES + * object is omitted by BIOS when the size is zero. + */ + if (int_value == 0) + eloc++; + break; + + case ENUM_POSSIBLE_VALUES: + size = enum_data->possible_values_size; + + for (pos_values = 0; pos_values < size && pos_values < MAX_VALUES_SIZE; + pos_values++) { + if (elem >= enum_obj_count) { + pr_err("Error enum-objects package is too small\n"); + return -EINVAL; + } + + ret = hp_convert_hexstr_to_str(enum_obj[elem + pos_values].string.pointer, + enum_obj[elem + pos_values].string.length, + &str_value, &value_len); + + if (ret) + return -EINVAL; + + /* + * ignore strings when possible values size + * is greater than MAX_VALUES_SIZE + */ + if (size < MAX_VALUES_SIZE) + strscpy(enum_data->possible_values[pos_values], + str_value, + sizeof(enum_data->possible_values[pos_values])); + + kfree(str_value); + str_value = NULL; + } + break; + default: + pr_warn("Invalid element: %d found in Enumeration attribute or data may be malformed\n", elem); + break; + } + + kfree(str_value); + str_value = NULL; + } + +exit_enumeration_package: + kfree(str_value); + return 0; +} + +/** + * hp_populate_enumeration_package_data() - + * Populate all properties of an instance under enumeration attribute + * + * @enum_obj: ACPI object with enumeration data + * @instance_id: The instance to enumerate + * @attr_name_kobj: The parent kernel object + */ +int hp_populate_enumeration_package_data(union acpi_object *enum_obj, + int instance_id, + struct kobject *attr_name_kobj) +{ + struct enumeration_data *enum_data = &bioscfg_drv.enumeration_data[instance_id]; + + enum_data->attr_name_kobj = attr_name_kobj; + + hp_populate_enumeration_elements_from_package(enum_obj, + enum_obj->package.count, + instance_id); + hp_update_attribute_permissions(enum_data->common.is_readonly, + &enumeration_current_val); + /* + * Several attributes have names such "MONDAY". Friendly + * user nane is generated to make the name more descriptive + */ + hp_friendly_user_name_update(enum_data->common.path, + attr_name_kobj->name, + enum_data->common.display_name, + sizeof(enum_data->common.display_name)); + return sysfs_create_group(attr_name_kobj, &enumeration_attr_group); +} + +static int hp_populate_enumeration_elements_from_buffer(u8 *buffer_ptr, u32 *buffer_size, + int instance_id) +{ + int values; + struct enumeration_data *enum_data = &bioscfg_drv.enumeration_data[instance_id]; + int ret = 0; + + /* + * Only data relevant to this driver and its functionality is + * read. BIOS defines the order in which each * element is + * read. Element 0 data is not relevant to this + * driver hence it is ignored. For clarity, all element names + * (DISPLAY_IN_UI) which defines the order in which is read + * and the name matches the variable where the data is stored. + * + * In earlier implementation, reported errors were ignored + * causing the data to remain uninitialized. It is not + * possible to determine if data read from BIOS is valid or + * not. It is for this reason functions may return a error + * without validating the data itself. + */ + + // VALUE: + ret = hp_get_string_from_buffer(&buffer_ptr, buffer_size, enum_data->current_value, + sizeof(enum_data->current_value)); + if (ret < 0) + goto buffer_exit; + + // COMMON: + ret = hp_get_common_data_from_buffer(&buffer_ptr, buffer_size, &enum_data->common); + if (ret < 0) + goto buffer_exit; + + // ENUM_CURRENT_VALUE: + ret = hp_get_string_from_buffer(&buffer_ptr, buffer_size, + enum_data->current_value, + sizeof(enum_data->current_value)); + if (ret < 0) + goto buffer_exit; + + // ENUM_SIZE: + ret = hp_get_integer_from_buffer(&buffer_ptr, buffer_size, + &enum_data->possible_values_size); + + if (enum_data->possible_values_size > MAX_VALUES_SIZE) { + /* Report a message and limit possible values size to maximum value */ + pr_warn("Enum Possible size value exceeded the maximum number of elements supported or data may be malformed\n"); + enum_data->possible_values_size = MAX_VALUES_SIZE; + } + + // ENUM_POSSIBLE_VALUES: + for (values = 0; values < enum_data->possible_values_size; values++) { + ret = hp_get_string_from_buffer(&buffer_ptr, buffer_size, + enum_data->possible_values[values], + sizeof(enum_data->possible_values[values])); + if (ret < 0) + break; + } + +buffer_exit: + return ret; +} + +/** + * hp_populate_enumeration_buffer_data() - + * Populate all properties of an instance under enumeration attribute + * + * @buffer_ptr: Buffer pointer + * @buffer_size: Buffer size + * @instance_id: The instance to enumerate + * @attr_name_kobj: The parent kernel object + */ +int hp_populate_enumeration_buffer_data(u8 *buffer_ptr, u32 *buffer_size, + int instance_id, + struct kobject *attr_name_kobj) +{ + struct enumeration_data *enum_data = &bioscfg_drv.enumeration_data[instance_id]; + int ret = 0; + + enum_data->attr_name_kobj = attr_name_kobj; + + /* Populate enumeration elements */ + ret = hp_populate_enumeration_elements_from_buffer(buffer_ptr, buffer_size, + instance_id); + if (ret < 0) + return ret; + + hp_update_attribute_permissions(enum_data->common.is_readonly, + &enumeration_current_val); + /* + * Several attributes have names such "MONDAY". A Friendlier + * user nane is generated to make the name more descriptive + */ + hp_friendly_user_name_update(enum_data->common.path, + attr_name_kobj->name, + enum_data->common.display_name, + sizeof(enum_data->common.display_name)); + + return sysfs_create_group(attr_name_kobj, &enumeration_attr_group); +} + +/** + * hp_exit_enumeration_attributes() - Clear all attribute data + * + * Clears all data allocated for this group of attributes + */ +void hp_exit_enumeration_attributes(void) +{ + int instance_id; + + for (instance_id = 0; instance_id < bioscfg_drv.enumeration_instances_count; + instance_id++) { + struct enumeration_data *enum_data = &bioscfg_drv.enumeration_data[instance_id]; + struct kobject *attr_name_kobj = enum_data->attr_name_kobj; + + if (attr_name_kobj) + sysfs_remove_group(attr_name_kobj, &enumeration_attr_group); + } + bioscfg_drv.enumeration_instances_count = 0; + + kfree(bioscfg_drv.enumeration_data); + bioscfg_drv.enumeration_data = NULL; +} diff --git a/drivers/platform/x86/hp/hp-bioscfg/int-attributes.c b/drivers/platform/x86/hp/hp-bioscfg/int-attributes.c new file mode 100644 index 000000000000..86b7ac63fec2 --- /dev/null +++ b/drivers/platform/x86/hp/hp-bioscfg/int-attributes.c @@ -0,0 +1,418 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Functions corresponding to integer type attributes under + * BIOS Enumeration GUID for use with hp-bioscfg driver. + * + * Copyright (c) 2022 Hewlett-Packard Inc. + */ + +#include "bioscfg.h" + +GET_INSTANCE_ID(integer); + +static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) +{ + int instance_id = get_integer_instance_id(kobj); + + if (instance_id < 0) + return -EIO; + + return sysfs_emit(buf, "%d\n", + bioscfg_drv.integer_data[instance_id].current_value); +} + +/** + * validate_integer_input() - + * Validate input of current_value against lower and upper bound + * + * @instance_id: The instance on which input is validated + * @buf: Input value + */ +static int validate_integer_input(int instance_id, char *buf) +{ + int in_val; + int ret; + struct integer_data *integer_data = &bioscfg_drv.integer_data[instance_id]; + + /* BIOS treats it as a read only attribute */ + if (integer_data->common.is_readonly) + return -EIO; + + ret = kstrtoint(buf, 10, &in_val); + if (ret < 0) + return ret; + + if (in_val < integer_data->lower_bound || + in_val > integer_data->upper_bound) + return -ERANGE; + + return 0; +} + +static void update_integer_value(int instance_id, char *attr_value) +{ + int in_val; + int ret; + struct integer_data *integer_data = &bioscfg_drv.integer_data[instance_id]; + + ret = kstrtoint(attr_value, 10, &in_val); + if (ret == 0) + integer_data->current_value = in_val; + else + pr_warn("Invalid integer value found: %s\n", attr_value); +} + +ATTRIBUTE_S_COMMON_PROPERTY_SHOW(display_name, integer); +static struct kobj_attribute integer_display_name = + __ATTR_RO(display_name); + +ATTRIBUTE_PROPERTY_STORE(current_value, integer); +static struct kobj_attribute integer_current_val = + __ATTR_RW_MODE(current_value, 0644); + +ATTRIBUTE_N_PROPERTY_SHOW(lower_bound, integer); +static struct kobj_attribute integer_lower_bound = + __ATTR_RO(lower_bound); + +ATTRIBUTE_N_PROPERTY_SHOW(upper_bound, integer); +static struct kobj_attribute integer_upper_bound = + __ATTR_RO(upper_bound); + +ATTRIBUTE_N_PROPERTY_SHOW(scalar_increment, integer); +static struct kobj_attribute integer_scalar_increment = + __ATTR_RO(scalar_increment); + +static ssize_t type_show(struct kobject *kobj, struct kobj_attribute *attr, + char *buf) +{ + return sysfs_emit(buf, "integer\n"); +} + +static struct kobj_attribute integer_type = + __ATTR_RO(type); + +static struct attribute *integer_attrs[] = { + &common_display_langcode.attr, + &integer_display_name.attr, + &integer_current_val.attr, + &integer_lower_bound.attr, + &integer_upper_bound.attr, + &integer_scalar_increment.attr, + &integer_type.attr, + NULL +}; + +static const struct attribute_group integer_attr_group = { + .attrs = integer_attrs, +}; + +int hp_alloc_integer_data(void) +{ + bioscfg_drv.integer_instances_count = hp_get_instance_count(HP_WMI_BIOS_INTEGER_GUID); + bioscfg_drv.integer_data = kcalloc(bioscfg_drv.integer_instances_count, + sizeof(*bioscfg_drv.integer_data), GFP_KERNEL); + + if (!bioscfg_drv.integer_data) { + bioscfg_drv.integer_instances_count = 0; + return -ENOMEM; + } + return 0; +} + +/* Expected Values types associated with each element */ +static const acpi_object_type expected_integer_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, + [INT_LOWER_BOUND] = ACPI_TYPE_INTEGER, + [INT_UPPER_BOUND] = ACPI_TYPE_INTEGER, + [INT_SCALAR_INCREMENT] = ACPI_TYPE_INTEGER, +}; + +static int hp_populate_integer_elements_from_package(union acpi_object *integer_obj, + int integer_obj_count, + int instance_id) +{ + char *str_value = NULL; + int value_len; + int ret; + u32 int_value = 0; + int elem; + int reqs; + int eloc; + int size; + struct integer_data *integer_data = &bioscfg_drv.integer_data[instance_id]; + + if (!integer_obj) + return -EINVAL; + + for (elem = 1, eloc = 1; elem < integer_obj_count; elem++, eloc++) { + /* ONLY look at the first INTEGER_ELEM_CNT elements */ + if (eloc == INT_ELEM_CNT) + goto exit_integer_package; + + switch (integer_obj[elem].type) { + case ACPI_TYPE_STRING: + if (elem != PREREQUISITES) { + ret = hp_convert_hexstr_to_str(integer_obj[elem].string.pointer, + integer_obj[elem].string.length, + &str_value, &value_len); + if (ret) + continue; + } + break; + case ACPI_TYPE_INTEGER: + int_value = (u32)integer_obj[elem].integer.value; + break; + default: + pr_warn("Unsupported object type [%d]\n", integer_obj[elem].type); + continue; + } + /* Check that both expected and read object type match */ + if (expected_integer_types[eloc] != integer_obj[elem].type) { + pr_err("Error expected type %d for elem %d, but got type %d instead\n", + expected_integer_types[eloc], elem, integer_obj[elem].type); + kfree(str_value); + return -EIO; + } + /* Assign appropriate element value to corresponding field*/ + switch (eloc) { + case VALUE: + ret = kstrtoint(str_value, 10, &int_value); + if (ret) + continue; + + integer_data->current_value = int_value; + break; + case PATH: + strscpy(integer_data->common.path, str_value, + sizeof(integer_data->common.path)); + break; + case IS_READONLY: + integer_data->common.is_readonly = int_value; + break; + case DISPLAY_IN_UI: + integer_data->common.display_in_ui = int_value; + break; + case REQUIRES_PHYSICAL_PRESENCE: + integer_data->common.requires_physical_presence = int_value; + break; + case SEQUENCE: + integer_data->common.sequence = int_value; + break; + case PREREQUISITES_SIZE: + if (int_value > MAX_PREREQUISITES_SIZE) { + pr_warn("Prerequisites size value exceeded the maximum number of elements supported or data may be malformed\n"); + int_value = MAX_PREREQUISITES_SIZE; + } + integer_data->common.prerequisites_size = int_value; + + /* + * This step 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 (integer_data->common.prerequisites_size == 0) + eloc++; + break; + case PREREQUISITES: + size = min_t(u32, integer_data->common.prerequisites_size, MAX_PREREQUISITES_SIZE); + + for (reqs = 0; reqs < size; reqs++) { + if (elem >= integer_obj_count) { + pr_err("Error elem-objects package is too small\n"); + return -EINVAL; + } + + ret = hp_convert_hexstr_to_str(integer_obj[elem + reqs].string.pointer, + integer_obj[elem + reqs].string.length, + &str_value, &value_len); + + if (ret) + continue; + + strscpy(integer_data->common.prerequisites[reqs], + str_value, + sizeof(integer_data->common.prerequisites[reqs])); + kfree(str_value); + str_value = NULL; + } + break; + + case SECURITY_LEVEL: + integer_data->common.security_level = int_value; + break; + case INT_LOWER_BOUND: + integer_data->lower_bound = int_value; + break; + case INT_UPPER_BOUND: + integer_data->upper_bound = int_value; + break; + case INT_SCALAR_INCREMENT: + integer_data->scalar_increment = int_value; + break; + default: + pr_warn("Invalid element: %d found in Integer attribute or data may be malformed\n", elem); + break; + } + + kfree(str_value); + str_value = NULL; + } +exit_integer_package: + kfree(str_value); + return 0; +} + +/** + * hp_populate_integer_package_data() - + * Populate all properties of an instance under integer attribute + * + * @integer_obj: ACPI object with integer data + * @instance_id: The instance to enumerate + * @attr_name_kobj: The parent kernel object + */ +int hp_populate_integer_package_data(union acpi_object *integer_obj, + int instance_id, + struct kobject *attr_name_kobj) +{ + struct integer_data *integer_data = &bioscfg_drv.integer_data[instance_id]; + + integer_data->attr_name_kobj = attr_name_kobj; + hp_populate_integer_elements_from_package(integer_obj, + integer_obj->package.count, + instance_id); + hp_update_attribute_permissions(integer_data->common.is_readonly, + &integer_current_val); + hp_friendly_user_name_update(integer_data->common.path, + attr_name_kobj->name, + integer_data->common.display_name, + sizeof(integer_data->common.display_name)); + return sysfs_create_group(attr_name_kobj, &integer_attr_group); +} + +static int hp_populate_integer_elements_from_buffer(u8 *buffer_ptr, u32 *buffer_size, + int instance_id) +{ + char *dst = NULL; + int dst_size = *buffer_size / sizeof(u16); + struct integer_data *integer_data = &bioscfg_drv.integer_data[instance_id]; + int ret = 0; + + dst = kcalloc(dst_size, sizeof(char), GFP_KERNEL); + if (!dst) + return -ENOMEM; + + /* + * Only data relevant to this driver and its functionality is + * read. BIOS defines the order in which each * element is + * read. Element 0 data is not relevant to this + * driver hence it is ignored. For clarity, all element names + * (DISPLAY_IN_UI) which defines the order in which is read + * and the name matches the variable where the data is stored. + * + * In earlier implementation, reported errors were ignored + * causing the data to remain uninitialized. It is not + * possible to determine if data read from BIOS is valid or + * not. It is for this reason functions may return a error + * without validating the data itself. + */ + + // VALUE: + integer_data->current_value = 0; + + hp_get_string_from_buffer(&buffer_ptr, buffer_size, dst, dst_size); + ret = kstrtoint(dst, 10, &integer_data->current_value); + if (ret) + pr_warn("Unable to convert string to integer: %s\n", dst); + kfree(dst); + + // COMMON: + ret = hp_get_common_data_from_buffer(&buffer_ptr, buffer_size, &integer_data->common); + if (ret < 0) + goto buffer_exit; + + // INT_LOWER_BOUND: + ret = hp_get_integer_from_buffer(&buffer_ptr, buffer_size, + &integer_data->lower_bound); + if (ret < 0) + goto buffer_exit; + + // INT_UPPER_BOUND: + ret = hp_get_integer_from_buffer(&buffer_ptr, buffer_size, + &integer_data->upper_bound); + if (ret < 0) + goto buffer_exit; + + // INT_SCALAR_INCREMENT: + ret = hp_get_integer_from_buffer(&buffer_ptr, buffer_size, + &integer_data->scalar_increment); + +buffer_exit: + return ret; +} + +/** + * hp_populate_integer_buffer_data() - + * Populate all properties of an instance under integer attribute + * + * @buffer_ptr: Buffer pointer + * @buffer_size: Buffer size + * @instance_id: The instance to enumerate + * @attr_name_kobj: The parent kernel object + */ +int hp_populate_integer_buffer_data(u8 *buffer_ptr, u32 *buffer_size, int instance_id, + struct kobject *attr_name_kobj) +{ + struct integer_data *integer_data = &bioscfg_drv.integer_data[instance_id]; + int ret = 0; + + integer_data->attr_name_kobj = attr_name_kobj; + + /* Populate integer elements */ + ret = hp_populate_integer_elements_from_buffer(buffer_ptr, buffer_size, + instance_id); + if (ret < 0) + return ret; + + hp_update_attribute_permissions(integer_data->common.is_readonly, + &integer_current_val); + hp_friendly_user_name_update(integer_data->common.path, + attr_name_kobj->name, + integer_data->common.display_name, + sizeof(integer_data->common.display_name)); + + return sysfs_create_group(attr_name_kobj, &integer_attr_group); +} + +/** + * hp_exit_integer_attributes() - Clear all attribute data + * + * Clears all data allocated for this group of attributes + */ +void hp_exit_integer_attributes(void) +{ + int instance_id; + + for (instance_id = 0; instance_id < bioscfg_drv.integer_instances_count; + instance_id++) { + struct kobject *attr_name_kobj = + bioscfg_drv.integer_data[instance_id].attr_name_kobj; + + if (attr_name_kobj) + sysfs_remove_group(attr_name_kobj, &integer_attr_group); + } + bioscfg_drv.integer_instances_count = 0; + + kfree(bioscfg_drv.integer_data); + bioscfg_drv.integer_data = NULL; +} diff --git a/drivers/platform/x86/hp/hp-bioscfg/order-list-attributes.c b/drivers/platform/x86/hp/hp-bioscfg/order-list-attributes.c new file mode 100644 index 000000000000..1ff09dfb7d7e --- /dev/null +++ b/drivers/platform/x86/hp/hp-bioscfg/order-list-attributes.c @@ -0,0 +1,441 @@ +// 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); +} + +static int replace_char_str(u8 *buffer, char *repl_char, char *repl_with) +{ + char *src = buffer; + int buflen = strlen(buffer); + int item; + + if (buflen < 1) + return -EINVAL; + + for (item = 0; item < buflen; item++) + if (src[item] == *repl_char) + src[item] = *repl_with; + + return 0; +} + +/** + * validate_ordered_list_input() - + * Validate input of current_value against possible values + * + * @instance: The instance on which input is validated + * @buf: Input value + */ +static int validate_ordered_list_input(int instance, char *buf) +{ + /* validation is done by BIOS. This validation function will + * convert semicolon to commas. BIOS uses commas as + * separators when reporting ordered-list values. + */ + return replace_char_str(buf, SEMICOLON_SEP, COMMA_SEP); +} + +static void update_ordered_list_value(int instance, char *attr_value) +{ + struct ordered_list_data *ordered_list_data = &bioscfg_drv.ordered_list_data[instance]; + + strscpy(ordered_list_data->current_value, + attr_value, + sizeof(ordered_list_data->current_value)); +} + +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_VALUES_PROPERTY_SHOW(elements, ordered_list, SEMICOLON_SEP); +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[] = { + &common_display_langcode.attr, + &ordered_list_display_name.attr, + &ordered_list_current_val.attr, + &ordered_list_elements_val.attr, + &ordered_list_type.attr, + NULL +}; + +static const struct attribute_group ordered_list_attr_group = { + .attrs = ordered_list_attrs, +}; + +int hp_alloc_ordered_list_data(void) +{ + bioscfg_drv.ordered_list_instances_count = + hp_get_instance_count(HP_WMI_BIOS_ORDERED_LIST_GUID); + bioscfg_drv.ordered_list_data = kcalloc(bioscfg_drv.ordered_list_instances_count, + sizeof(*bioscfg_drv.ordered_list_data), + GFP_KERNEL); + if (!bioscfg_drv.ordered_list_data) { + bioscfg_drv.ordered_list_instances_count = 0; + return -ENOMEM; + } + return 0; +} + +/* 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, +}; + +static int hp_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 = 0; + int ret; + u32 size; + u32 int_value = 0; + int elem; + int olist_elem; + int reqs; + int eloc; + char *tmpstr = NULL; + char *part_tmp = NULL; + int tmp_len = 0; + char *part = NULL; + struct ordered_list_data *ordered_list_data = &bioscfg_drv.ordered_list_data[instance_id]; + + if (!order_obj) + return -EINVAL; + + for (elem = 1, eloc = 1; eloc < ORD_ELEM_CNT; elem++, eloc++) { + + switch (order_obj[elem].type) { + case ACPI_TYPE_STRING: + if (elem != PREREQUISITES && elem != ORD_LIST_ELEMENTS) { + ret = hp_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); + kfree(str_value); + return -EIO; + } + + /* Assign appropriate element value to corresponding field*/ + switch (eloc) { + case VALUE: + strscpy(ordered_list_data->current_value, + str_value, sizeof(ordered_list_data->current_value)); + replace_char_str(ordered_list_data->current_value, COMMA_SEP, SEMICOLON_SEP); + break; + case PATH: + strscpy(ordered_list_data->common.path, str_value, + sizeof(ordered_list_data->common.path)); + break; + case IS_READONLY: + ordered_list_data->common.is_readonly = int_value; + break; + case DISPLAY_IN_UI: + ordered_list_data->common.display_in_ui = int_value; + break; + case REQUIRES_PHYSICAL_PRESENCE: + ordered_list_data->common.requires_physical_presence = int_value; + break; + case SEQUENCE: + ordered_list_data->common.sequence = int_value; + break; + case PREREQUISITES_SIZE: + if (int_value > MAX_PREREQUISITES_SIZE) { + pr_warn("Prerequisites size value exceeded the maximum number of elements supported or data may be malformed\n"); + int_value = MAX_PREREQUISITES_SIZE; + } + ordered_list_data->common.prerequisites_size = int_value; + + /* + * This step 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 = min_t(u32, ordered_list_data->common.prerequisites_size, + MAX_PREREQUISITES_SIZE); + for (reqs = 0; reqs < size; reqs++) { + ret = hp_convert_hexstr_to_str(order_obj[elem + reqs].string.pointer, + order_obj[elem + reqs].string.length, + &str_value, &value_len); + + if (ret) + continue; + + strscpy(ordered_list_data->common.prerequisites[reqs], + str_value, + sizeof(ordered_list_data->common.prerequisites[reqs])); + + kfree(str_value); + str_value = NULL; + } + break; + + case SECURITY_LEVEL: + ordered_list_data->common.security_level = int_value; + break; + + case ORD_LIST_SIZE: + if (int_value > MAX_ELEMENTS_SIZE) { + pr_warn("Order List size value exceeded the maximum number of elements supported or data may be malformed\n"); + int_value = MAX_ELEMENTS_SIZE; + } + ordered_list_data->elements_size = int_value; + + /* + * This step 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: + + /* + * Ordered list data is stored in hex and comma separated format + * Convert the data and split it to show each element + */ + ret = hp_convert_hexstr_to_str(str_value, value_len, &tmpstr, &tmp_len); + if (ret) + goto exit_list; + + part_tmp = tmpstr; + part = strsep(&part_tmp, COMMA_SEP); + + for (olist_elem = 0; olist_elem < MAX_ELEMENTS_SIZE && part; olist_elem++) { + strscpy(ordered_list_data->elements[olist_elem], + part, + sizeof(ordered_list_data->elements[olist_elem])); + part = strsep(&part_tmp, COMMA_SEP); + } + ordered_list_data->elements_size = olist_elem; + + kfree(str_value); + str_value = NULL; + break; + default: + pr_warn("Invalid element: %d found in Ordered_List attribute or data may be malformed\n", elem); + break; + } + kfree(tmpstr); + tmpstr = NULL; + kfree(str_value); + str_value = NULL; + } + +exit_list: + kfree(tmpstr); + kfree(str_value); + return 0; +} + +/** + * hp_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 hp_populate_ordered_list_package_data(union acpi_object *order_obj, int instance_id, + struct kobject *attr_name_kobj) +{ + struct ordered_list_data *ordered_list_data = &bioscfg_drv.ordered_list_data[instance_id]; + + ordered_list_data->attr_name_kobj = attr_name_kobj; + + hp_populate_ordered_list_elements_from_package(order_obj, + order_obj->package.count, + instance_id); + hp_update_attribute_permissions(ordered_list_data->common.is_readonly, + &ordered_list_current_val); + hp_friendly_user_name_update(ordered_list_data->common.path, + attr_name_kobj->name, + ordered_list_data->common.display_name, + sizeof(ordered_list_data->common.display_name)); + return sysfs_create_group(attr_name_kobj, &ordered_list_attr_group); +} + +static int hp_populate_ordered_list_elements_from_buffer(u8 *buffer_ptr, u32 *buffer_size, + int instance_id) +{ + int values; + struct ordered_list_data *ordered_list_data = &bioscfg_drv.ordered_list_data[instance_id]; + int ret = 0; + + /* + * Only data relevant to this driver and its functionality is + * read. BIOS defines the order in which each * element is + * read. Element 0 data is not relevant to this + * driver hence it is ignored. For clarity, all element names + * (DISPLAY_IN_UI) which defines the order in which is read + * and the name matches the variable where the data is stored. + * + * In earlier implementation, reported errors were ignored + * causing the data to remain uninitialized. It is not + * possible to determine if data read from BIOS is valid or + * not. It is for this reason functions may return a error + * without validating the data itself. + */ + + // VALUE: + ret = hp_get_string_from_buffer(&buffer_ptr, buffer_size, ordered_list_data->current_value, + sizeof(ordered_list_data->current_value)); + if (ret < 0) + goto buffer_exit; + + replace_char_str(ordered_list_data->current_value, COMMA_SEP, SEMICOLON_SEP); + + // COMMON: + ret = hp_get_common_data_from_buffer(&buffer_ptr, buffer_size, + &ordered_list_data->common); + if (ret < 0) + goto buffer_exit; + + // ORD_LIST_SIZE: + ret = hp_get_integer_from_buffer(&buffer_ptr, buffer_size, + &ordered_list_data->elements_size); + + if (ordered_list_data->elements_size > MAX_ELEMENTS_SIZE) { + /* Report a message and limit elements size to maximum value */ + pr_warn("Ordered List size value exceeded the maximum number of elements supported or data may be malformed\n"); + ordered_list_data->elements_size = MAX_ELEMENTS_SIZE; + } + + // ORD_LIST_ELEMENTS: + for (values = 0; values < ordered_list_data->elements_size; values++) { + ret = hp_get_string_from_buffer(&buffer_ptr, buffer_size, + ordered_list_data->elements[values], + sizeof(ordered_list_data->elements[values])); + if (ret < 0) + break; + } + +buffer_exit: + return ret; +} + +/** + * hp_populate_ordered_list_buffer_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 + */ +int hp_populate_ordered_list_buffer_data(u8 *buffer_ptr, u32 *buffer_size, int instance_id, + struct kobject *attr_name_kobj) +{ + struct ordered_list_data *ordered_list_data = &bioscfg_drv.ordered_list_data[instance_id]; + int ret = 0; + + ordered_list_data->attr_name_kobj = attr_name_kobj; + + /* Populate ordered list elements */ + ret = hp_populate_ordered_list_elements_from_buffer(buffer_ptr, buffer_size, + instance_id); + if (ret < 0) + return ret; + + hp_update_attribute_permissions(ordered_list_data->common.is_readonly, + &ordered_list_current_val); + hp_friendly_user_name_update(ordered_list_data->common.path, + attr_name_kobj->name, + ordered_list_data->common.display_name, + sizeof(ordered_list_data->common.display_name)); + + return sysfs_create_group(attr_name_kobj, &ordered_list_attr_group); +} + +/** + * hp_exit_ordered_list_attributes() - Clear all attribute data + * + * Clears all data allocated for this group of attributes + */ +void hp_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; +} diff --git a/drivers/platform/x86/hp/hp-bioscfg/passwdobj-attributes.c b/drivers/platform/x86/hp/hp-bioscfg/passwdobj-attributes.c new file mode 100644 index 000000000000..03d0188804ba --- /dev/null +++ b/drivers/platform/x86/hp/hp-bioscfg/passwdobj-attributes.c @@ -0,0 +1,556 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Functions corresponding to password object type attributes under + * BIOS PASSWORD for use with hp-bioscfg driver. + * + * Copyright (c) 2022 HP Development Company, L.P. + */ + +#include "bioscfg.h" +#include <asm-generic/posix_types.h> + +GET_INSTANCE_ID(password); +/* + * Clear all passwords copied to memory for a particular + * authentication instance + */ +static int clear_passwords(const int instance) +{ + struct password_data *password_data = &bioscfg_drv.password_data[instance]; + + if (!password_data->is_enabled) + return 0; + + memset(password_data->current_password, + 0, sizeof(password_data->current_password)); + memset(password_data->new_password, + 0, sizeof(password_data->new_password)); + + return 0; +} + +/* + * Clear all credentials copied to memory for both Power-ON and Setup + * BIOS instances + */ +int hp_clear_all_credentials(void) +{ + int count = bioscfg_drv.password_instances_count; + int instance; + + /* clear all passwords */ + for (instance = 0; instance < count; instance++) + clear_passwords(instance); + + /* clear auth_token */ + kfree(bioscfg_drv.spm_data.auth_token); + bioscfg_drv.spm_data.auth_token = NULL; + + return 0; +} + +int hp_get_password_instance_for_type(const char *name) +{ + int count = bioscfg_drv.password_instances_count; + int instance; + + for (instance = 0; instance < count; instance++) + if (!strcmp(bioscfg_drv.password_data[instance].common.display_name, name)) + return instance; + + return -EINVAL; +} + +static int validate_password_input(int instance_id, const char *buf) +{ + int length; + struct password_data *password_data = &bioscfg_drv.password_data[instance_id]; + + length = strlen(buf); + if (buf[length - 1] == '\n') + length--; + + if (length > MAX_PASSWD_SIZE) + return INVALID_BIOS_AUTH; + + if (password_data->min_password_length > length || + password_data->max_password_length < length) + return INVALID_BIOS_AUTH; + return SUCCESS; +} + +ATTRIBUTE_N_PROPERTY_SHOW(is_enabled, password); +static struct kobj_attribute password_is_password_set = __ATTR_RO(is_enabled); + +static int store_password_instance(struct kobject *kobj, const char *buf, + size_t count, bool is_current) +{ + char *buf_cp; + int id, ret = 0; + + buf_cp = kstrdup(buf, GFP_KERNEL); + if (!buf_cp) + return -ENOMEM; + + ret = hp_enforce_single_line_input(buf_cp, count); + if (!ret) { + id = get_password_instance_id(kobj); + + if (id >= 0) + ret = validate_password_input(id, buf_cp); + } + + if (!ret) { + if (is_current) + strscpy(bioscfg_drv.password_data[id].current_password, + buf_cp, + sizeof(bioscfg_drv.password_data[id].current_password)); + else + strscpy(bioscfg_drv.password_data[id].new_password, + buf_cp, + sizeof(bioscfg_drv.password_data[id].new_password)); + } + + kfree(buf_cp); + return ret < 0 ? ret : count; +} + +static ssize_t current_password_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + return store_password_instance(kobj, buf, count, true); +} + +static struct kobj_attribute password_current_password = __ATTR_WO(current_password); + +static ssize_t new_password_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + return store_password_instance(kobj, buf, count, true); +} + +static struct kobj_attribute password_new_password = __ATTR_WO(new_password); + +ATTRIBUTE_N_PROPERTY_SHOW(min_password_length, password); +static struct kobj_attribute password_min_password_length = __ATTR_RO(min_password_length); + +ATTRIBUTE_N_PROPERTY_SHOW(max_password_length, password); +static struct kobj_attribute password_max_password_length = __ATTR_RO(max_password_length); + +static ssize_t role_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) +{ + if (!strcmp(kobj->name, SETUP_PASSWD)) + return sysfs_emit(buf, "%s\n", BIOS_ADMIN); + + if (!strcmp(kobj->name, POWER_ON_PASSWD)) + return sysfs_emit(buf, "%s\n", POWER_ON); + + return -EIO; +} + +static struct kobj_attribute password_role = __ATTR_RO(role); + +static ssize_t mechanism_show(struct kobject *kobj, struct kobj_attribute *attr, + char *buf) +{ + int i = get_password_instance_id(kobj); + + if (i < 0) + return i; + + if (bioscfg_drv.password_data[i].mechanism != PASSWORD) + return -EINVAL; + + return sysfs_emit(buf, "%s\n", PASSWD_MECHANISM_TYPES); +} + +static struct kobj_attribute password_mechanism = __ATTR_RO(mechanism); + +ATTRIBUTE_VALUES_PROPERTY_SHOW(encodings, password, SEMICOLON_SEP); +static struct kobj_attribute password_encodings_val = __ATTR_RO(encodings); + +static struct attribute *password_attrs[] = { + &password_is_password_set.attr, + &password_min_password_length.attr, + &password_max_password_length.attr, + &password_current_password.attr, + &password_new_password.attr, + &password_role.attr, + &password_mechanism.attr, + &password_encodings_val.attr, + NULL +}; + +static const struct attribute_group password_attr_group = { + .attrs = password_attrs +}; + +int hp_alloc_password_data(void) +{ + bioscfg_drv.password_instances_count = hp_get_instance_count(HP_WMI_BIOS_PASSWORD_GUID); + bioscfg_drv.password_data = kcalloc(bioscfg_drv.password_instances_count, + sizeof(*bioscfg_drv.password_data), GFP_KERNEL); + if (!bioscfg_drv.password_data) { + bioscfg_drv.password_instances_count = 0; + return -ENOMEM; + } + + return 0; +} + +/* Expected Values types associated with each element */ +static const acpi_object_type expected_password_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, + [PSWD_MIN_LENGTH] = ACPI_TYPE_INTEGER, + [PSWD_MAX_LENGTH] = ACPI_TYPE_INTEGER, + [PSWD_SIZE] = ACPI_TYPE_INTEGER, + [PSWD_ENCODINGS] = ACPI_TYPE_STRING, + [PSWD_IS_SET] = ACPI_TYPE_INTEGER, +}; + +static int hp_populate_password_elements_from_package(union acpi_object *password_obj, + int password_obj_count, + int instance_id) +{ + char *str_value = NULL; + int value_len; + int ret; + u32 size; + u32 int_value = 0; + int elem; + int reqs; + int eloc; + int pos_values; + struct password_data *password_data = &bioscfg_drv.password_data[instance_id]; + + if (!password_obj) + return -EINVAL; + + for (elem = 1, eloc = 1; elem < password_obj_count; elem++, eloc++) { + /* ONLY look at the first PASSWORD_ELEM_CNT elements */ + if (eloc == PSWD_ELEM_CNT) + goto exit_package; + + switch (password_obj[elem].type) { + case ACPI_TYPE_STRING: + if (PREREQUISITES != elem && PSWD_ENCODINGS != elem) { + ret = hp_convert_hexstr_to_str(password_obj[elem].string.pointer, + password_obj[elem].string.length, + &str_value, &value_len); + if (ret) + continue; + } + break; + case ACPI_TYPE_INTEGER: + int_value = (u32)password_obj[elem].integer.value; + break; + default: + pr_warn("Unsupported object type [%d]\n", password_obj[elem].type); + continue; + } + + /* Check that both expected and read object type match */ + if (expected_password_types[eloc] != password_obj[elem].type) { + pr_err("Error expected type %d for elem %d, but got type %d instead\n", + expected_password_types[eloc], elem, password_obj[elem].type); + kfree(str_value); + return -EIO; + } + + /* Assign appropriate element value to corresponding field*/ + switch (eloc) { + case VALUE: + break; + case PATH: + strscpy(password_data->common.path, str_value, + sizeof(password_data->common.path)); + break; + case IS_READONLY: + password_data->common.is_readonly = int_value; + break; + case DISPLAY_IN_UI: + password_data->common.display_in_ui = int_value; + break; + case REQUIRES_PHYSICAL_PRESENCE: + password_data->common.requires_physical_presence = int_value; + break; + case SEQUENCE: + password_data->common.sequence = int_value; + break; + case PREREQUISITES_SIZE: + if (int_value > MAX_PREREQUISITES_SIZE) { + pr_warn("Prerequisites size value exceeded the maximum number of elements supported or data may be malformed\n"); + int_value = MAX_PREREQUISITES_SIZE; + } + password_data->common.prerequisites_size = int_value; + + /* This step 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 = min_t(u32, password_data->common.prerequisites_size, + MAX_PREREQUISITES_SIZE); + + for (reqs = 0; reqs < size; reqs++) { + ret = hp_convert_hexstr_to_str(password_obj[elem + reqs].string.pointer, + password_obj[elem + reqs].string.length, + &str_value, &value_len); + + if (ret) + break; + + strscpy(password_data->common.prerequisites[reqs], + str_value, + sizeof(password_data->common.prerequisites[reqs])); + + kfree(str_value); + str_value = NULL; + + } + break; + case SECURITY_LEVEL: + password_data->common.security_level = int_value; + break; + case PSWD_MIN_LENGTH: + password_data->min_password_length = int_value; + break; + case PSWD_MAX_LENGTH: + password_data->max_password_length = int_value; + break; + case PSWD_SIZE: + + if (int_value > MAX_ENCODINGS_SIZE) { + pr_warn("Password Encoding size value exceeded the maximum number of elements supported or data may be malformed\n"); + int_value = MAX_ENCODINGS_SIZE; + } + password_data->encodings_size = int_value; + + /* This step is needed to keep the expected + * element list pointing to the right obj[elem].type + * when the size is zero. PSWD_ENCODINGS + * object is omitted by BIOS when the size is + * zero. + */ + if (int_value == 0) + eloc++; + break; + case PSWD_ENCODINGS: + size = min_t(u32, password_data->encodings_size, MAX_ENCODINGS_SIZE); + for (pos_values = 0; pos_values < size; pos_values++) { + ret = hp_convert_hexstr_to_str(password_obj[elem + pos_values].string.pointer, + password_obj[elem + pos_values].string.length, + &str_value, &value_len); + if (ret) + break; + + strscpy(password_data->encodings[pos_values], + str_value, + sizeof(password_data->encodings[pos_values])); + kfree(str_value); + str_value = NULL; + + } + break; + case PSWD_IS_SET: + password_data->is_enabled = int_value; + break; + default: + pr_warn("Invalid element: %d found in Password attribute or data may be malformed\n", elem); + break; + } + + kfree(str_value); + str_value = NULL; + } + +exit_package: + kfree(str_value); + return 0; +} + +/** + * hp_populate_password_package_data() + * Populate all properties for an instance under password attribute + * + * @password_obj: ACPI object with password data + * @instance_id: The instance to enumerate + * @attr_name_kobj: The parent kernel object + */ +int hp_populate_password_package_data(union acpi_object *password_obj, int instance_id, + struct kobject *attr_name_kobj) +{ + struct password_data *password_data = &bioscfg_drv.password_data[instance_id]; + + password_data->attr_name_kobj = attr_name_kobj; + + hp_populate_password_elements_from_package(password_obj, + password_obj->package.count, + instance_id); + + hp_friendly_user_name_update(password_data->common.path, + attr_name_kobj->name, + password_data->common.display_name, + sizeof(password_data->common.display_name)); + + if (!strcmp(attr_name_kobj->name, SETUP_PASSWD)) + return sysfs_create_group(attr_name_kobj, &password_attr_group); + + return sysfs_create_group(attr_name_kobj, &password_attr_group); +} + +static int hp_populate_password_elements_from_buffer(u8 *buffer_ptr, u32 *buffer_size, + int instance_id) +{ + int values; + int isreadonly; + struct password_data *password_data = &bioscfg_drv.password_data[instance_id]; + int ret = 0; + + /* + * Only data relevant to this driver and its functionality is + * read. BIOS defines the order in which each * element is + * read. Element 0 data is not relevant to this + * driver hence it is ignored. For clarity, all element names + * (DISPLAY_IN_UI) which defines the order in which is read + * and the name matches the variable where the data is stored. + * + * In earlier implementation, reported errors were ignored + * causing the data to remain uninitialized. It is not + * possible to determine if data read from BIOS is valid or + * not. It is for this reason functions may return a error + * without validating the data itself. + */ + + // VALUE: + ret = hp_get_string_from_buffer(&buffer_ptr, buffer_size, password_data->current_password, + sizeof(password_data->current_password)); + if (ret < 0) + goto buffer_exit; + + // COMMON: + ret = hp_get_common_data_from_buffer(&buffer_ptr, buffer_size, + &password_data->common); + if (ret < 0) + goto buffer_exit; + + // PSWD_MIN_LENGTH: + ret = hp_get_integer_from_buffer(&buffer_ptr, buffer_size, + &password_data->min_password_length); + if (ret < 0) + goto buffer_exit; + + // PSWD_MAX_LENGTH: + ret = hp_get_integer_from_buffer(&buffer_ptr, buffer_size, + &password_data->max_password_length); + if (ret < 0) + goto buffer_exit; + + // PSWD_SIZE: + ret = hp_get_integer_from_buffer(&buffer_ptr, buffer_size, + &password_data->encodings_size); + if (ret < 0) + goto buffer_exit; + + if (password_data->encodings_size > MAX_ENCODINGS_SIZE) { + /* Report a message and limit possible values size to maximum value */ + pr_warn("Password Encoding size value exceeded the maximum number of elements supported or data may be malformed\n"); + password_data->encodings_size = MAX_ENCODINGS_SIZE; + } + + // PSWD_ENCODINGS: + for (values = 0; values < password_data->encodings_size; values++) { + ret = hp_get_string_from_buffer(&buffer_ptr, buffer_size, + password_data->encodings[values], + sizeof(password_data->encodings[values])); + if (ret < 0) + break; + } + + // PSWD_IS_SET: + ret = hp_get_integer_from_buffer(&buffer_ptr, buffer_size, &isreadonly); + if (ret < 0) + goto buffer_exit; + + password_data->is_enabled = isreadonly ? true : false; + +buffer_exit: + return ret; +} + +/** + * hp_populate_password_buffer_data() + * Populate all properties for an instance under password object attribute + * + * @buffer_ptr: Buffer pointer + * @buffer_size: Buffer size + * @instance_id: The instance to enumerate + * @attr_name_kobj: The parent kernel object + */ +int hp_populate_password_buffer_data(u8 *buffer_ptr, u32 *buffer_size, int instance_id, + struct kobject *attr_name_kobj) +{ + struct password_data *password_data = &bioscfg_drv.password_data[instance_id]; + int ret = 0; + + password_data->attr_name_kobj = attr_name_kobj; + + /* Populate Password attributes */ + ret = hp_populate_password_elements_from_buffer(buffer_ptr, buffer_size, + instance_id); + if (ret < 0) + return ret; + + hp_friendly_user_name_update(password_data->common.path, + attr_name_kobj->name, + password_data->common.display_name, + sizeof(password_data->common.display_name)); + if (!strcmp(attr_name_kobj->name, SETUP_PASSWD)) + return sysfs_create_group(attr_name_kobj, &password_attr_group); + + return sysfs_create_group(attr_name_kobj, &password_attr_group); +} + +/** + * hp_exit_password_attributes() - Clear all attribute data + * + * Clears all data allocated for this group of attributes + */ +void hp_exit_password_attributes(void) +{ + int instance_id; + + for (instance_id = 0; instance_id < bioscfg_drv.password_instances_count; + instance_id++) { + struct kobject *attr_name_kobj = + bioscfg_drv.password_data[instance_id].attr_name_kobj; + + if (attr_name_kobj) { + if (!strcmp(attr_name_kobj->name, SETUP_PASSWD)) + sysfs_remove_group(attr_name_kobj, + &password_attr_group); + else + sysfs_remove_group(attr_name_kobj, + &password_attr_group); + } + } + bioscfg_drv.password_instances_count = 0; + kfree(bioscfg_drv.password_data); + bioscfg_drv.password_data = NULL; +} diff --git a/drivers/platform/x86/hp/hp-bioscfg/spmobj-attributes.c b/drivers/platform/x86/hp/hp-bioscfg/spmobj-attributes.c new file mode 100644 index 000000000000..86f90238750c --- /dev/null +++ b/drivers/platform/x86/hp/hp-bioscfg/spmobj-attributes.c @@ -0,0 +1,381 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Functions corresponding to secure platform management object type + * attributes under BIOS PASSWORD for use with hp-bioscfg driver + * + * Copyright (c) 2022 HP Development Company, L.P. + */ + +#include "bioscfg.h" + +static const char * const spm_state_types[] = { + "not provisioned", + "provisioned", + "provisioning in progress", +}; + +static const char * const spm_mechanism_types[] = { + "not provisioned", + "signing-key", + "endorsement-key", +}; + +struct secureplatform_provisioning_data { + u8 state; + u8 version[2]; + u8 reserved1; + u32 features; + u32 nonce; + u8 reserved2[28]; + u8 sk_mod[MAX_KEY_MOD_SIZE]; + u8 kek_mod[MAX_KEY_MOD_SIZE]; +}; + +/** + * hp_calculate_security_buffer() - determines size of security buffer + * for authentication scheme + * + * @authentication: the authentication content + * + * Currently only supported type is Admin password + */ +size_t hp_calculate_security_buffer(const char *authentication) +{ + size_t size, authlen; + + if (!authentication) + return sizeof(u16) * 2; + + authlen = strlen(authentication); + if (!authlen) + return sizeof(u16) * 2; + + size = sizeof(u16) + authlen * sizeof(u16); + if (!strstarts(authentication, BEAM_PREFIX)) + size += strlen(UTF_PREFIX) * sizeof(u16); + + return size; +} + +/** + * hp_populate_security_buffer() - builds a security buffer for + * authentication scheme + * + * @authbuf: the security buffer + * @authentication: the authentication content + * + * Currently only supported type is PLAIN TEXT + */ +int hp_populate_security_buffer(u16 *authbuf, const char *authentication) +{ + u16 *auth = authbuf; + char *strprefix = NULL; + int ret = 0; + + if (strstarts(authentication, BEAM_PREFIX)) { + /* + * BEAM_PREFIX is append to authbuf when a signature + * is provided and Sure Admin is enabled in BIOS + */ + /* BEAM_PREFIX found, convert part to unicode */ + auth = hp_ascii_to_utf16_unicode(auth, authentication); + if (!auth) + return -EINVAL; + + } else { + /* + * UTF-16 prefix is append to the * authbuf when a BIOS + * admin password is configured in BIOS + */ + + /* append UTF_PREFIX to part and then convert it to unicode */ + strprefix = kasprintf(GFP_KERNEL, "%s%s", UTF_PREFIX, + authentication); + if (!strprefix) + return -ENOMEM; + + auth = hp_ascii_to_utf16_unicode(auth, strprefix); + kfree(strprefix); + + if (!auth) { + ret = -EINVAL; + goto out_buffer; + } + } + +out_buffer: + return ret; +} + +static ssize_t update_spm_state(void) +{ + struct secureplatform_provisioning_data data; + int ret; + + ret = hp_wmi_perform_query(HPWMI_SECUREPLATFORM_GET_STATE, + HPWMI_SECUREPLATFORM, &data, 0, + sizeof(data)); + if (ret < 0) + return ret; + + bioscfg_drv.spm_data.mechanism = data.state; + if (bioscfg_drv.spm_data.mechanism) + bioscfg_drv.spm_data.is_enabled = 1; + + return 0; +} + +static ssize_t statusbin(struct kobject *kobj, + struct kobj_attribute *attr, + struct secureplatform_provisioning_data *buf) +{ + int ret = hp_wmi_perform_query(HPWMI_SECUREPLATFORM_GET_STATE, + HPWMI_SECUREPLATFORM, buf, 0, + sizeof(*buf)); + + if (ret < 0) + return ret; + + return sizeof(struct secureplatform_provisioning_data); +} + +/* + * status_show - Reads SPM status + */ +static ssize_t status_show(struct kobject *kobj, struct kobj_attribute + *attr, char *buf) +{ + int ret, i; + int len = 0; + struct secureplatform_provisioning_data data; + + ret = statusbin(kobj, attr, &data); + if (ret < 0) + return ret; + + /* + * 'status' is a read-only file that returns ASCII text in + * JSON format reporting the status information. + * + * "State": "not provisioned | provisioned | provisioning in progress ", + * "Version": " Major. Minor ", + * "Nonce": <16-bit unsigned number display in base 10>, + * "FeaturesInUse": <16-bit unsigned number display in base 10>, + * "EndorsementKeyMod": "<256 bytes in base64>", + * "SigningKeyMod": "<256 bytes in base64>" + */ + + len += sysfs_emit_at(buf, len, "{\n"); + len += sysfs_emit_at(buf, len, "\t\"State\": \"%s\",\n", + spm_state_types[data.state]); + len += sysfs_emit_at(buf, len, "\t\"Version\": \"%d.%d\"", + data.version[0], data.version[1]); + + /* + * state == 0 means secure platform management + * feature is not configured in BIOS. + */ + if (data.state == 0) { + len += sysfs_emit_at(buf, len, "\n"); + goto status_exit; + } else { + len += sysfs_emit_at(buf, len, ",\n"); + } + + len += sysfs_emit_at(buf, len, "\t\"Nonce\": %d,\n", data.nonce); + len += sysfs_emit_at(buf, len, "\t\"FeaturesInUse\": %d,\n", data.features); + len += sysfs_emit_at(buf, len, "\t\"EndorsementKeyMod\": \""); + + for (i = 255; i >= 0; i--) + len += sysfs_emit_at(buf, len, " %u", data.kek_mod[i]); + + len += sysfs_emit_at(buf, len, " \",\n"); + len += sysfs_emit_at(buf, len, "\t\"SigningKeyMod\": \""); + + for (i = 255; i >= 0; i--) + len += sysfs_emit_at(buf, len, " %u", data.sk_mod[i]); + + /* Return buf contents */ + len += sysfs_emit_at(buf, len, " \"\n"); + +status_exit: + len += sysfs_emit_at(buf, len, "}\n"); + + return len; +} + +static struct kobj_attribute password_spm_status = __ATTR_RO(status); + +ATTRIBUTE_SPM_N_PROPERTY_SHOW(is_enabled, spm); +static struct kobj_attribute password_spm_is_key_enabled = __ATTR_RO(is_enabled); + +static ssize_t key_mechanism_show(struct kobject *kobj, struct kobj_attribute *attr, + char *buf) +{ + return sysfs_emit(buf, "%s\n", + spm_mechanism_types[bioscfg_drv.spm_data.mechanism]); +} + +static struct kobj_attribute password_spm_key_mechanism = __ATTR_RO(key_mechanism); + +static ssize_t sk_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + int ret; + int length; + + length = count; + if (buf[length - 1] == '\n') + length--; + + /* allocate space and copy current signing key */ + bioscfg_drv.spm_data.signing_key = kmemdup(buf, length, GFP_KERNEL); + if (!bioscfg_drv.spm_data.signing_key) + return -ENOMEM; + + /* submit signing key payload */ + ret = hp_wmi_perform_query(HPWMI_SECUREPLATFORM_SET_SK, + HPWMI_SECUREPLATFORM, + (void *)bioscfg_drv.spm_data.signing_key, + count, 0); + + if (!ret) { + bioscfg_drv.spm_data.mechanism = SIGNING_KEY; + hp_set_reboot_and_signal_event(); + } + + kfree(bioscfg_drv.spm_data.signing_key); + bioscfg_drv.spm_data.signing_key = NULL; + + return ret ? ret : count; +} + +static struct kobj_attribute password_spm_signing_key = __ATTR_WO(sk); + +static ssize_t kek_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + int ret; + int length; + + length = count; + if (buf[length - 1] == '\n') + length--; + + /* allocate space and copy current signing key */ + bioscfg_drv.spm_data.endorsement_key = kmemdup(buf, length, GFP_KERNEL); + if (!bioscfg_drv.spm_data.endorsement_key) { + ret = -ENOMEM; + goto exit_kek; + } + + ret = hp_wmi_perform_query(HPWMI_SECUREPLATFORM_SET_KEK, + HPWMI_SECUREPLATFORM, + (void *)bioscfg_drv.spm_data.endorsement_key, + count, 0); + + if (!ret) { + bioscfg_drv.spm_data.mechanism = ENDORSEMENT_KEY; + hp_set_reboot_and_signal_event(); + } + +exit_kek: + kfree(bioscfg_drv.spm_data.endorsement_key); + bioscfg_drv.spm_data.endorsement_key = NULL; + + return ret ? ret : count; +} + +static struct kobj_attribute password_spm_endorsement_key = __ATTR_WO(kek); + +static ssize_t role_show(struct kobject *kobj, struct kobj_attribute *attr, + char *buf) +{ + return sysfs_emit(buf, "%s\n", BIOS_SPM); +} + +static struct kobj_attribute password_spm_role = __ATTR_RO(role); + +static ssize_t auth_token_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + int ret = 0; + int length; + + length = count; + if (buf[length - 1] == '\n') + length--; + + /* allocate space and copy current auth token */ + bioscfg_drv.spm_data.auth_token = kmemdup(buf, length, GFP_KERNEL); + if (!bioscfg_drv.spm_data.auth_token) { + ret = -ENOMEM; + goto exit_token; + } + + return count; + +exit_token: + kfree(bioscfg_drv.spm_data.auth_token); + bioscfg_drv.spm_data.auth_token = NULL; + + return ret; +} + +static struct kobj_attribute password_spm_auth_token = __ATTR_WO(auth_token); + +static struct attribute *secure_platform_attrs[] = { + &password_spm_is_key_enabled.attr, + &password_spm_signing_key.attr, + &password_spm_endorsement_key.attr, + &password_spm_key_mechanism.attr, + &password_spm_status.attr, + &password_spm_role.attr, + &password_spm_auth_token.attr, + NULL, +}; + +static const struct attribute_group secure_platform_attr_group = { + .attrs = secure_platform_attrs, +}; + +void hp_exit_secure_platform_attributes(void) +{ + /* remove secure platform sysfs entry and free key data*/ + + kfree(bioscfg_drv.spm_data.endorsement_key); + bioscfg_drv.spm_data.endorsement_key = NULL; + + kfree(bioscfg_drv.spm_data.signing_key); + bioscfg_drv.spm_data.signing_key = NULL; + + kfree(bioscfg_drv.spm_data.auth_token); + bioscfg_drv.spm_data.auth_token = NULL; + + if (bioscfg_drv.spm_data.attr_name_kobj) + sysfs_remove_group(bioscfg_drv.spm_data.attr_name_kobj, + &secure_platform_attr_group); +} + +int hp_populate_secure_platform_data(struct kobject *attr_name_kobj) +{ + /* Populate data for Secure Platform Management */ + bioscfg_drv.spm_data.attr_name_kobj = attr_name_kobj; + + strscpy(bioscfg_drv.spm_data.attribute_name, SPM_STR, + sizeof(bioscfg_drv.spm_data.attribute_name)); + + bioscfg_drv.spm_data.is_enabled = 0; + bioscfg_drv.spm_data.mechanism = 0; + bioscfg_drv.pending_reboot = false; + update_spm_state(); + + bioscfg_drv.spm_data.endorsement_key = NULL; + bioscfg_drv.spm_data.signing_key = NULL; + bioscfg_drv.spm_data.auth_token = NULL; + + return sysfs_create_group(attr_name_kobj, &secure_platform_attr_group); +} diff --git a/drivers/platform/x86/hp/hp-bioscfg/string-attributes.c b/drivers/platform/x86/hp/hp-bioscfg/string-attributes.c new file mode 100644 index 000000000000..f0c20070094d --- /dev/null +++ b/drivers/platform/x86/hp/hp-bioscfg/string-attributes.c @@ -0,0 +1,395 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Functions corresponding to string type attributes under + * HP_WMI_BIOS_STRING_GUID for use with hp-bioscfg driver. + * + * Copyright (c) 2022 HP Development Company, L.P. + */ + +#include "bioscfg.h" + +#define WMI_STRING_TYPE "HPBIOS_BIOSString" + +GET_INSTANCE_ID(string); + +static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) +{ + int instance_id = get_string_instance_id(kobj); + + if (instance_id < 0) + return -EIO; + + return sysfs_emit(buf, "%s\n", + bioscfg_drv.string_data[instance_id].current_value); +} + +/** + * validate_string_input() - + * Validate input of current_value against min and max lengths + * + * @instance_id: The instance on which input is validated + * @buf: Input value + */ +static int validate_string_input(int instance_id, const char *buf) +{ + int in_len = strlen(buf); + struct string_data *string_data = &bioscfg_drv.string_data[instance_id]; + + /* BIOS treats it as a read only attribute */ + if (string_data->common.is_readonly) + return -EIO; + + if (in_len < string_data->min_length || in_len > string_data->max_length) + return -ERANGE; + + return 0; +} + +static void update_string_value(int instance_id, char *attr_value) +{ + struct string_data *string_data = &bioscfg_drv.string_data[instance_id]; + + /* Write settings to BIOS */ + strscpy(string_data->current_value, attr_value, sizeof(string_data->current_value)); +} + +/* + * ATTRIBUTE_S_COMMON_PROPERTY_SHOW(display_name_language_code, string); + * static struct kobj_attribute string_display_langcode = + * __ATTR_RO(display_name_language_code); + */ + +ATTRIBUTE_S_COMMON_PROPERTY_SHOW(display_name, string); +static struct kobj_attribute string_display_name = + __ATTR_RO(display_name); + +ATTRIBUTE_PROPERTY_STORE(current_value, string); +static struct kobj_attribute string_current_val = + __ATTR_RW_MODE(current_value, 0644); + +ATTRIBUTE_N_PROPERTY_SHOW(min_length, string); +static struct kobj_attribute string_min_length = + __ATTR_RO(min_length); + +ATTRIBUTE_N_PROPERTY_SHOW(max_length, string); +static struct kobj_attribute string_max_length = + __ATTR_RO(max_length); + +static ssize_t type_show(struct kobject *kobj, struct kobj_attribute *attr, + char *buf) +{ + return sysfs_emit(buf, "string\n"); +} + +static struct kobj_attribute string_type = + __ATTR_RO(type); + +static struct attribute *string_attrs[] = { + &common_display_langcode.attr, + &string_display_name.attr, + &string_current_val.attr, + &string_min_length.attr, + &string_max_length.attr, + &string_type.attr, + NULL +}; + +static const struct attribute_group string_attr_group = { + .attrs = string_attrs, +}; + +int hp_alloc_string_data(void) +{ + bioscfg_drv.string_instances_count = hp_get_instance_count(HP_WMI_BIOS_STRING_GUID); + bioscfg_drv.string_data = kcalloc(bioscfg_drv.string_instances_count, + sizeof(*bioscfg_drv.string_data), GFP_KERNEL); + if (!bioscfg_drv.string_data) { + bioscfg_drv.string_instances_count = 0; + return -ENOMEM; + } + return 0; +} + +/* Expected Values types associated with each element */ +static const acpi_object_type expected_string_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, + [STR_MIN_LENGTH] = ACPI_TYPE_INTEGER, + [STR_MAX_LENGTH] = ACPI_TYPE_INTEGER, +}; + +static int hp_populate_string_elements_from_package(union acpi_object *string_obj, + int string_obj_count, + int instance_id) +{ + char *str_value = NULL; + int value_len; + int ret = 0; + u32 int_value = 0; + int elem; + int reqs; + int eloc; + int size; + struct string_data *string_data = &bioscfg_drv.string_data[instance_id]; + + if (!string_obj) + return -EINVAL; + + for (elem = 1, eloc = 1; elem < string_obj_count; elem++, eloc++) { + /* ONLY look at the first STRING_ELEM_CNT elements */ + if (eloc == STR_ELEM_CNT) + goto exit_string_package; + + switch (string_obj[elem].type) { + case ACPI_TYPE_STRING: + if (elem != PREREQUISITES) { + ret = hp_convert_hexstr_to_str(string_obj[elem].string.pointer, + string_obj[elem].string.length, + &str_value, &value_len); + + if (ret) + continue; + } + break; + case ACPI_TYPE_INTEGER: + int_value = (u32)string_obj[elem].integer.value; + break; + default: + pr_warn("Unsupported object type [%d]\n", string_obj[elem].type); + continue; + } + + /* Check that both expected and read object type match */ + if (expected_string_types[eloc] != string_obj[elem].type) { + pr_err("Error expected type %d for elem %d, but got type %d instead\n", + expected_string_types[eloc], elem, string_obj[elem].type); + kfree(str_value); + return -EIO; + } + + /* Assign appropriate element value to corresponding field*/ + switch (eloc) { + case VALUE: + strscpy(string_data->current_value, + str_value, sizeof(string_data->current_value)); + break; + case PATH: + strscpy(string_data->common.path, str_value, + sizeof(string_data->common.path)); + break; + case IS_READONLY: + string_data->common.is_readonly = int_value; + break; + case DISPLAY_IN_UI: + string_data->common.display_in_ui = int_value; + break; + case REQUIRES_PHYSICAL_PRESENCE: + string_data->common.requires_physical_presence = int_value; + break; + case SEQUENCE: + string_data->common.sequence = int_value; + break; + case PREREQUISITES_SIZE: + if (int_value > MAX_PREREQUISITES_SIZE) { + pr_warn("Prerequisites size value exceeded the maximum number of elements supported or data may be malformed\n"); + int_value = MAX_PREREQUISITES_SIZE; + } + string_data->common.prerequisites_size = int_value; + + /* + * This step 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 (string_data->common.prerequisites_size == 0) + eloc++; + break; + case PREREQUISITES: + size = min_t(u32, string_data->common.prerequisites_size, + MAX_PREREQUISITES_SIZE); + + for (reqs = 0; reqs < size; reqs++) { + if (elem >= string_obj_count) { + pr_err("Error elem-objects package is too small\n"); + return -EINVAL; + } + + ret = hp_convert_hexstr_to_str(string_obj[elem + reqs].string.pointer, + string_obj[elem + reqs].string.length, + &str_value, &value_len); + + if (ret) + continue; + + strscpy(string_data->common.prerequisites[reqs], + str_value, + sizeof(string_data->common.prerequisites[reqs])); + kfree(str_value); + str_value = NULL; + } + break; + + case SECURITY_LEVEL: + string_data->common.security_level = int_value; + break; + case STR_MIN_LENGTH: + string_data->min_length = int_value; + break; + case STR_MAX_LENGTH: + string_data->max_length = int_value; + break; + default: + pr_warn("Invalid element: %d found in String attribute or data may be malformed\n", elem); + break; + } + + kfree(str_value); + str_value = NULL; + } + +exit_string_package: + kfree(str_value); + return 0; +} + +/** + * hp_populate_string_package_data() - + * Populate all properties of an instance under string attribute + * + * @string_obj: ACPI object with string data + * @instance_id: The instance to enumerate + * @attr_name_kobj: The parent kernel object + */ +int hp_populate_string_package_data(union acpi_object *string_obj, + int instance_id, + struct kobject *attr_name_kobj) +{ + struct string_data *string_data = &bioscfg_drv.string_data[instance_id]; + + string_data->attr_name_kobj = attr_name_kobj; + + hp_populate_string_elements_from_package(string_obj, + string_obj->package.count, + instance_id); + + hp_update_attribute_permissions(string_data->common.is_readonly, + &string_current_val); + hp_friendly_user_name_update(string_data->common.path, + attr_name_kobj->name, + string_data->common.display_name, + sizeof(string_data->common.display_name)); + return sysfs_create_group(attr_name_kobj, &string_attr_group); +} + +static int hp_populate_string_elements_from_buffer(u8 *buffer_ptr, u32 *buffer_size, + int instance_id) +{ + int ret = 0; + struct string_data *string_data = &bioscfg_drv.string_data[instance_id]; + + /* + * Only data relevant to this driver and its functionality is + * read. BIOS defines the order in which each * element is + * read. Element 0 data is not relevant to this + * driver hence it is ignored. For clarity, all element names + * (DISPLAY_IN_UI) which defines the order in which is read + * and the name matches the variable where the data is stored. + * + * In earlier implementation, reported errors were ignored + * causing the data to remain uninitialized. It is not + * possible to determine if data read from BIOS is valid or + * not. It is for this reason functions may return a error + * without validating the data itself. + */ + + // VALUE: + ret = hp_get_string_from_buffer(&buffer_ptr, buffer_size, string_data->current_value, + sizeof(string_data->current_value)); + if (ret < 0) + goto buffer_exit; + + // COMMON: + ret = hp_get_common_data_from_buffer(&buffer_ptr, buffer_size, &string_data->common); + if (ret < 0) + goto buffer_exit; + + // STR_MIN_LENGTH: + ret = hp_get_integer_from_buffer(&buffer_ptr, buffer_size, + &string_data->min_length); + if (ret < 0) + goto buffer_exit; + + // STR_MAX_LENGTH: + ret = hp_get_integer_from_buffer(&buffer_ptr, buffer_size, + &string_data->max_length); + +buffer_exit: + + return ret; +} + +/** + * hp_populate_string_buffer_data() - + * Populate all properties of an instance under string attribute + * + * @buffer_ptr: Buffer pointer + * @buffer_size: Buffer size + * @instance_id: The instance to enumerate + * @attr_name_kobj: The parent kernel object + */ +int hp_populate_string_buffer_data(u8 *buffer_ptr, u32 *buffer_size, + int instance_id, + struct kobject *attr_name_kobj) +{ + struct string_data *string_data = &bioscfg_drv.string_data[instance_id]; + int ret = 0; + + string_data->attr_name_kobj = attr_name_kobj; + + ret = hp_populate_string_elements_from_buffer(buffer_ptr, buffer_size, + instance_id); + if (ret < 0) + return ret; + + hp_update_attribute_permissions(string_data->common.is_readonly, + &string_current_val); + hp_friendly_user_name_update(string_data->common.path, + attr_name_kobj->name, + string_data->common.display_name, + sizeof(string_data->common.display_name)); + + return sysfs_create_group(attr_name_kobj, &string_attr_group); +} + +/** + * hp_exit_string_attributes() - Clear all attribute data + * + * Clears all data allocated for this group of attributes + */ +void hp_exit_string_attributes(void) +{ + int instance_id; + + for (instance_id = 0; instance_id < bioscfg_drv.string_instances_count; + instance_id++) { + struct kobject *attr_name_kobj = + bioscfg_drv.string_data[instance_id].attr_name_kobj; + + if (attr_name_kobj) + sysfs_remove_group(attr_name_kobj, &string_attr_group); + } + bioscfg_drv.string_instances_count = 0; + + kfree(bioscfg_drv.string_data); + bioscfg_drv.string_data = NULL; +} diff --git a/drivers/platform/x86/hp/hp-bioscfg/surestart-attributes.c b/drivers/platform/x86/hp/hp-bioscfg/surestart-attributes.c new file mode 100644 index 000000000000..b57e42f29282 --- /dev/null +++ b/drivers/platform/x86/hp/hp-bioscfg/surestart-attributes.c @@ -0,0 +1,132 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Functions corresponding to sure start object type attributes under + * BIOS for use with hp-bioscfg driver + * + * Copyright (c) 2022 HP Development Company, L.P. + */ + +#include "bioscfg.h" +#include <linux/types.h> + +/* Maximum number of log entries supported when log entry size is 16 + * bytes. This value is calculated by dividing 4096 (page size) by + * log entry size. + */ +#define LOG_MAX_ENTRIES 254 + +/* + * Current Log entry size. This value size will change in the + * future. The driver reads a total of 128 bytes for each log entry + * provided by BIOS but only the first 16 bytes are used/read. + */ +#define LOG_ENTRY_SIZE 16 + +/* + * audit_log_entry_count_show - Reports the number of + * existing audit log entries available + * to be read + */ +static ssize_t audit_log_entry_count_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + int ret; + u32 count = 0; + + ret = hp_wmi_perform_query(HPWMI_SURESTART_GET_LOG_COUNT, + HPWMI_SURESTART, + &count, 1, sizeof(count)); + + if (ret < 0) + return ret; + + return sysfs_emit(buf, "%d,%d,%d\n", count, LOG_ENTRY_SIZE, + LOG_MAX_ENTRIES); +} + +/* + * audit_log_entries_show() - Return all entries found in log file + */ +static ssize_t audit_log_entries_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + int ret; + int i; + u32 count = 0; + u8 audit_log_buffer[128]; + + // Get the number of event logs + ret = hp_wmi_perform_query(HPWMI_SURESTART_GET_LOG_COUNT, + HPWMI_SURESTART, + &count, 1, sizeof(count)); + + if (ret < 0) + return ret; + + /* + * The show() api will not work if the audit logs ever go + * beyond 4KB + */ + if (count * LOG_ENTRY_SIZE > PAGE_SIZE) + return -EIO; + + /* + * We are guaranteed the buffer is 4KB so today all the event + * logs will fit + */ + for (i = 0; i < count; i++) { + audit_log_buffer[0] = i + 1; + + /* + * read audit log entry at a time. 'buf' input value + * provides the audit log entry to be read. On + * input, Byte 0 = Audit Log entry number from + * beginning (1..254) + * Entry number 1 is the newest entry whereas the + * highest entry number (number of entries) is the + * oldest entry. + */ + ret = hp_wmi_perform_query(HPWMI_SURESTART_GET_LOG, + HPWMI_SURESTART, + audit_log_buffer, 1, 128); + + if (ret < 0 || (LOG_ENTRY_SIZE * i) > PAGE_SIZE) { + /* + * Encountered a failure while reading + * individual logs. Only a partial list of + * audit log will be returned. + */ + break; + } else { + memcpy(buf, audit_log_buffer, LOG_ENTRY_SIZE); + buf += LOG_ENTRY_SIZE; + } + } + + return i * LOG_ENTRY_SIZE; +} + +static struct kobj_attribute sure_start_audit_log_entry_count = __ATTR_RO(audit_log_entry_count); +static struct kobj_attribute sure_start_audit_log_entries = __ATTR_RO(audit_log_entries); + +static struct attribute *sure_start_attrs[] = { + &sure_start_audit_log_entry_count.attr, + &sure_start_audit_log_entries.attr, + NULL +}; + +static const struct attribute_group sure_start_attr_group = { + .attrs = sure_start_attrs, +}; + +void hp_exit_sure_start_attributes(void) +{ + sysfs_remove_group(bioscfg_drv.sure_start_attr_kobj, + &sure_start_attr_group); +} + +int hp_populate_sure_start_data(struct kobject *attr_name_kobj) +{ + bioscfg_drv.sure_start_attr_kobj = attr_name_kobj; + return sysfs_create_group(attr_name_kobj, &sure_start_attr_group); +} |