// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Think LMI BIOS configuration driver
*
* Copyright(C) 2019-2021 Lenovo
*
* Original code from Thinkpad-wmi project https://github.com/iksaif/thinkpad-wmi
* Copyright(C) 2017 Corentin Chary <[email protected]>
* Distributed under the GPL-2.0 license
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/acpi.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/mutex.h>
#include <linux/string_helpers.h>
#include <linux/types.h>
#include <linux/dmi.h>
#include <linux/wmi.h>
#include "firmware_attributes_class.h"
#include "think-lmi.h"
static bool debug_support;
module_param(debug_support, bool, 0444);
MODULE_PARM_DESC(debug_support, "Enable debug command support");
/*
* Name: BiosSetting
* Description: Get item name and settings for current LMI instance.
* Type: Query
* Returns: "Item,Value"
* Example: "WakeOnLAN,Enable"
*/
#define LENOVO_BIOS_SETTING_GUID "51F5230E-9677-46CD-A1CF-C0B23EE34DB7"
/*
* Name: SetBiosSetting
* Description: Change the BIOS setting to the desired value using the SetBiosSetting
* class. To save the settings, use the SaveBiosSetting class.
* BIOS settings and values are case sensitive.
* After making changes to the BIOS settings, you must reboot the computer
* before the changes will take effect.
* Type: Method
* Arguments: "Item,Value,Password,Encoding,KbdLang;"
* Example: "WakeOnLAN,Disable,pa55w0rd,ascii,us;"
*/
#define LENOVO_SET_BIOS_SETTINGS_GUID "98479A64-33F5-4E33-A707-8E251EBBC3A1"
/*
* Name: SaveBiosSettings
* Description: Save any pending changes in settings.
* Type: Method
* Arguments: "Password,Encoding,KbdLang;"
* Example: "pa55w0rd,ascii,us;"
*/
#define LENOVO_SAVE_BIOS_SETTINGS_GUID "6A4B54EF-A5ED-4D33-9455-B0D9B48DF4B3"
/*
* Name: BiosPasswordSettings
* Description: Return BIOS Password settings
* Type: Query
* Returns: PasswordMode, PasswordState, MinLength, MaxLength,
* SupportedEncoding, SupportedKeyboard
*/
#define LENOVO_BIOS_PASSWORD_SETTINGS_GUID "8ADB159E-1E32-455C-BC93-308A7ED98246"
/*
* Name: SetBiosPassword
* Description: Change a specific password.
* - BIOS settings cannot be changed at the same boot as power-on
* passwords (POP) and hard disk passwords (HDP). If you want to change
* BIOS settings and POP or HDP, you must reboot the system after changing
* one of them.
* - A password cannot be set using this method when one does not already
* exist. Passwords can only be updated or cleared.
* Type: Method
* Arguments: "PasswordType,CurrentPassword,NewPassword,Encoding,KbdLang;"
* Example: "pop,pa55w0rd,newpa55w0rd,ascii,us;”
*/
#define LENOVO_SET_BIOS_PASSWORD_GUID "2651D9FD-911C-4B69-B94E-D0DED5963BD7"
/*
* Name: GetBiosSelections
* Description: Return a list of valid settings for a given item.
* Type: Method
* Arguments: "Item"
* Returns: "Value1,Value2,Value3,..."
* Example:
* -> "FlashOverLAN"
* <- "Enabled,Disabled"
*/
#define LENOVO_GET_BIOS_SELECTIONS_GUID "7364651A-132F-4FE7-ADAA-40C6C7EE2E3B"
/*
* Name: DebugCmd
* Description: Debug entry method for entering debug commands to the BIOS
*/
#define LENOVO_DEBUG_CMD_GUID "7FF47003-3B6C-4E5E-A227-E979824A85D1"
/*
* Name: OpcodeIF
* Description: Opcode interface which provides the ability to set multiple
* parameters and then trigger an action with a final command.
* This is particularly useful for simplifying setting passwords.
* With this support comes the ability to set System, HDD and NVMe
* passwords.
* This is currently available on ThinkCenter and ThinkStations platforms
*/
#define LENOVO_OPCODE_IF_GUID "DFDDEF2C-57D4-48ce-B196-0FB787D90836"
/*
* Name: SetBiosCert
* Description: Install BIOS certificate.
* Type: Method
* Arguments: "Certificate,Password"
* You must reboot the computer before the changes will take effect.
*/
#define LENOVO_SET_BIOS_CERT_GUID "26861C9F-47E9-44C4-BD8B-DFE7FA2610FE"
/*
* Name: UpdateBiosCert
* Description: Update BIOS certificate.
* Type: Method
* Format: "Certificate,Signature"
* You must reboot the computer before the changes will take effect.
*/
#define LENOVO_UPDATE_BIOS_CERT_GUID "9AA3180A-9750-41F7-B9F7-D5D3B1BAC3CE"
/*
* Name: ClearBiosCert
* Description: Uninstall BIOS certificate.
* Type: Method
* Format: "Serial,Signature"
* You must reboot the computer before the changes will take effect.
*/
#define LENOVO_CLEAR_BIOS_CERT_GUID "B2BC39A7-78DD-4D71-B059-A510DEC44890"
/*
* Name: CertToPassword
* Description: Switch from certificate to password authentication.
* Type: Method
* Format: "Password,Signature"
* You must reboot the computer before the changes will take effect.
*/
#define LENOVO_CERT_TO_PASSWORD_GUID "0DE8590D-5510-4044-9621-77C227F5A70D"
/*
* Name: SetBiosSettingCert
* Description: Set attribute using certificate authentication.
* Type: Method
* Format: "Item,Value,Signature"
*/
#define LENOVO_SET_BIOS_SETTING_CERT_GUID "34A008CC-D205-4B62-9E67-31DFA8B90003"
/*
* Name: SaveBiosSettingCert
* Description: Save any pending changes in settings.
* Type: Method
* Format: "Signature"
*/
#define LENOVO_SAVE_BIOS_SETTING_CERT_GUID "C050FB9D-DF5F-4606-B066-9EFC401B2551"
/*
* Name: CertThumbprint
* Description: Display Certificate thumbprints
* Type: Query
* Returns: MD5, SHA1 & SHA256 thumbprints
*/
#define LENOVO_CERT_THUMBPRINT_GUID "C59119ED-1C0D-4806-A8E9-59AA318176C4"
#define TLMI_POP_PWD BIT(0) /* Supervisor */
#define TLMI_PAP_PWD BIT(1) /* Power-on */
#define TLMI_HDD_PWD BIT(2) /* HDD/NVME */
#define TLMI_SMP_PWD BIT(6) /* System Management */
#define TLMI_CERT BIT(7) /* Certificate Based */
static const struct tlmi_err_codes tlmi_errs[] = {
{"Success", 0},
{"Not Supported", -EOPNOTSUPP},
{"Invalid Parameter", -EINVAL},
{"Access Denied", -EACCES},
{"System Busy", -EBUSY},
};
static const char * const encoding_options[] = {
[TLMI_ENCODING_ASCII] = "ascii",
[TLMI_ENCODING_SCANCODE] = "scancode",
};
static const char * const level_options[] = {
[TLMI_LEVEL_USER] = "user",
[TLMI_LEVEL_MASTER] = "master",
};
static struct think_lmi tlmi_priv;
static const struct class *fw_attr_class;
static DEFINE_MUTEX(tlmi_mutex);
static inline struct tlmi_pwd_setting *to_tlmi_pwd_setting(struct kobject *kobj)
{
return container_of(kobj, struct tlmi_pwd_setting, kobj);
}
static inline struct tlmi_attr_setting *to_tlmi_attr_setting(struct kobject *kobj)
{
return container_of(kobj, struct tlmi_attr_setting, kobj);
}
/* Convert BIOS WMI error string to suitable error code */
static int tlmi_errstr_to_err(const char *errstr)
{
int i;
for (i = 0; i < sizeof(tlmi_errs)/sizeof(struct tlmi_err_codes); i++) {
if (!strcmp(tlmi_errs[i].err_str, errstr))
return tlmi_errs[i].err_code;
}
return -EPERM;
}
/* Extract error string from WMI return buffer */
static int tlmi_extract_error(const struct acpi_buffer *output)
{
const union acpi_object *obj;
obj = output->pointer;
if (!obj)
return -ENOMEM;
if (obj->type != ACPI_TYPE_STRING || !obj->string.pointer)
return -EIO;
return tlmi_errstr_to_err(obj->string.pointer);
}
/* Utility function to execute WMI call to BIOS */
static int tlmi_simple_call(const char *guid, const char *arg)
{
const struct acpi_buffer input = { strlen(arg), (char *)arg };
struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
acpi_status status;
int i, err;
/*
* Duplicated call required to match BIOS workaround for behavior
* seen when WMI accessed via scripting on other OS.
*/
for (i = 0; i < 2; i++) {
/* (re)initialize output buffer to default state */
output.length = ACPI_ALLOCATE_BUFFER;
output.pointer = NULL;
status = wmi_evaluate_method(guid, 0, 0, &input, &output);
if (ACPI_FAILURE(status)) {
kfree(output.pointer);
return -EIO;
}
err = tlmi_extract_error(&output);
kfree(output.pointer);
if (err)
return err;
}
return 0;
}
/* Extract output string from WMI return buffer */
static int tlmi_extract_output_string(const struct acpi_buffer *output,
char **string)
{
const union acpi_object *obj;
char *s;
obj = output->pointer;
if (!obj)
return -ENOMEM;
if (obj->type != ACPI_TYPE_STRING || !obj->string.pointer)
return -EIO;
s = kstrdup(obj->string.pointer, GFP_KERNEL);
if (!s)
return -ENOMEM;
*string = s;
return 0;
}
/* ------ Core interface functions ------------*/
/* Get password settings from BIOS */
static int tlmi_get_pwd_settings(struct tlmi_pwdcfg *pwdcfg)
{
struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
const union acpi_object *obj;
acpi_status status;
int copy_size;
if (!tlmi_priv.can_get_password_settings)
return -EOPNOTSUPP;
status = wmi_query_block(LENOVO_BIOS_PASSWORD_SETTINGS_GUID, 0,
&output);
if (ACPI_FAILURE(status))
return -EIO;
obj = output.pointer;
if (!obj)
return -ENOMEM;
if (obj->type != ACPI_TYPE_BUFFER || !obj->buffer.pointer) {
kfree(obj);
return -EIO;
}
/*
* The size of thinkpad_wmi_pcfg on ThinkStation is larger than ThinkPad.
* To make the driver compatible on different brands, we permit it to get
* the data in below case.
* Settings must have at minimum the core fields available
*/
if (obj->buffer.length < sizeof(struct tlmi_pwdcfg_core)) {
pr_warn("Unknown pwdcfg buffer length %d\n", obj->buffer.length);
kfree(obj);
return -EIO;
}
copy_size = min_t(size_t, obj->buffer.length, sizeof(struct tlmi_pwdcfg));
memcpy(pwdcfg, obj->buffer.pointer, copy_size);
kfree(obj);
if (WARN_ON(pwdcfg->core.max_length >= TLMI_PWD_BUFSIZE))
pwdcfg->core.max_length = TLMI_PWD_BUFSIZE - 1;
return 0;
}
static int tlmi_save_bios_settings(const char *password)
{
return tlmi_simple_call(LENOVO_SAVE_BIOS_SETTINGS_GUID,
password);
}
static int tlmi_opcode_setting(char *setting, const char *value)
{
char *opcode_str;
int ret;
opcode_str = kasprintf(GFP_KERNEL, "%s:%s;", setting, value);
if (!opcode_str)
return -ENOMEM;
ret = tlmi_simple_call(LENOVO_OPCODE_IF_GUID, opcode_str);
kfree(opcode_str);
return ret;
}
static int tlmi_setting(int item, char **value, const char *guid_string)
{
struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
acpi_status status;
int ret;
status = wmi_query_block(guid_string, item, &output);
if (ACPI_FAILURE(status)) {
kfree(output.pointer);
return -EIO;
}
ret = tlmi_extract_output_string(&output, value);
kfree(output.pointer);
return ret;
}
static int tlmi_get_bios_selections(const char *item, char **value)
{
const struct acpi_buffer input = { strlen(item), (char *)item };
struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
acpi_status status;
int ret;
status = wmi_evaluate_method(LENOVO_GET_BIOS_SELECTIONS_GUID,
0, 0, &input, &output);
if (ACPI_FAILURE(status)) {
kfree(output.pointer);
return -EIO;
}
ret = tlmi_extract_output_string(&output, value);
kfree(output.pointer);
return ret;
}
/* ---- Authentication sysfs --------------------------------------------------------- */
static ssize_t is_enabled_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
return sysfs_emit(buf, "%d\n", setting->valid);
}
static struct kobj_attribute auth_is_pass_set = __ATTR_RO(is_enabled);
static ssize_t current_password_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
size_t pwdlen;
pwdlen = strlen(buf);
/* pwdlen == 0 is allowed to clear the password */
if (pwdlen && ((pwdlen < setting->minlen) || (pwdlen > setting->maxlen)))
return -EINVAL;
strscpy(setting->password, buf, setting->maxlen);
/* Strip out CR if one is present, setting password won't work if it is present */
strreplace(setting->password, '\n', '\0');
return count;
}
static struct kobj_attribute auth_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)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
char *auth_str, *new_pwd;
size_t pwdlen;
int ret;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!tlmi_priv.can_set_bios_password)
return -EOPNOTSUPP;
/* Strip out CR if one is present, setting password won't work if it is present */
new_pwd = kstrdup_and_replace(buf, '\n', '\0', GFP_KERNEL);
if (!new_pwd)
return -ENOMEM;
/* Use lock in case multiple WMI operations needed */
mutex_lock(&tlmi_mutex);
pwdlen = strlen(new_pwd);
/* pwdlen == 0 is allowed to clear the password */
if (pwdlen && ((pwdlen < setting->minlen) || (pwdlen > setting->maxlen))) {
ret = -EINVAL;
goto out;
}
/* If opcode support is present use that interface */
if (tlmi_priv.opcode_support) {
char pwd_type[8];
/* Special handling required for HDD and NVMe passwords */
if (setting == tlmi_priv.pwd_hdd) {
if (setting->level == TLMI_LEVEL_USER)
sprintf(pwd_type, "uhdp%d", setting->index);
else
sprintf(pwd_type, "mhdp%d", setting->index);
} else if (setting == tlmi_priv.pwd_nvme) {
if (setting->level == TLMI_LEVEL_USER)
sprintf(pwd_type, "udrp%d", setting->index);
else
sprintf(pwd_type, "adrp%d", setting->index);
} else {
sprintf(pwd_type, "%s", setting->pwd_type);
}
ret = tlmi_opcode_setting("WmiOpcodePasswordType", pwd_type);
if (ret)
goto out;
if (tlmi_priv.pwd_admin->valid) {
ret = tlmi_opcode_setting("WmiOpcodePasswordAdmin",
tlmi_priv.pwd_admin->password);
if (ret)
goto out;
}
ret = tlmi_opcode_setting("WmiOpcodePasswordCurrent01", setting->password);
if (ret)
goto out;
ret = tlmi_opcode_setting("WmiOpcodePasswordNew01", new_pwd);
if (ret)
goto out;
ret = tlmi_simple_call(LENOVO_OPCODE_IF_GUID, "WmiOpcodePasswordSetUpdate;");
} else {
/* Format: 'PasswordType,CurrentPw,NewPw,Encoding,KbdLang;' */
auth_str = kasprintf(GFP_KERNEL, "%s,%s,%s,%s,%s;",
setting->pwd_type, setting->password, new_pwd,
encoding_options[setting->encoding], setting->kbdlang);
if (!auth_str) {
ret = -ENOMEM;
goto out;
}
ret = tlmi_simple_call(LENOVO_SET_BIOS_PASSWORD_GUID, auth_str);
kfree(auth_str);
}
out:
mutex_unlock(&tlmi_mutex);
kfree(new_pwd);
return ret ?: count;
}
static struct kobj_attribute auth_new_password = __ATTR_WO(new_password);
static ssize_t min_password_length_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
return sysfs_emit(buf, "%d\n", setting->minlen);
}
static struct kobj_attribute auth_min_pass_length = __ATTR_RO(min_password_length);
static ssize_t max_password_length_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
return sysfs_emit(buf, "%d\n", setting->maxlen);
}
static struct kobj_attribute auth_max_pass_length = __ATTR_RO(max_password_length);
static ssize_t mechanism_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
return sysfs_emit(buf, "password\n");
}
static struct kobj_attribute auth_mechanism = __ATTR_RO(mechanism);
static ssize_t encoding_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
return sysfs_emit(buf, "%s\n", encoding_options[setting->encoding]);
}
static ssize_t encoding_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
int i;
/* Scan for a matching profile */
i = sysfs_match_string(encoding_options, buf);
if (i < 0)
return -EINVAL;
setting->encoding = i;
return count;
}
static struct kobj_attribute auth_encoding = __ATTR_RW(encoding);
static ssize_t kbdlang_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
return sysfs_emit(buf, "%s\n", setting->kbdlang);
}
static ssize_t kbdlang_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
int length;
/* Calculate length till '\n' or terminating 0 */
length = strchrnul(buf, '\n') - buf;
if (!length || length >= TLMI_LANG_MAXLEN)
return -EINVAL;
memcpy(setting->kbdlang, buf, length);
setting->kbdlang[length] = '\0';
return count;
}
static struct kobj_attribute auth_kbdlang = __ATTR_RW(kbdlang);
static ssize_t role_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
return sysfs_emit(buf, "%s\n", setting->role);
}
static struct kobj_attribute auth_role = __ATTR_RO(role);
static ssize_t index_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
return sysfs_emit(buf, "%d\n", setting->index);
}
static ssize_t index_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
int err, val;
err = kstrtoint(buf, 10, &val);
if (err < 0)
return err;
if (val < 0 || val > TLMI_INDEX_MAX)
return -EINVAL;
setting->index = val;
return count;
}
static struct kobj_attribute auth_index = __ATTR_RW(index);
static ssize_t level_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
return sysfs_emit(buf, "%s\n", level_options[setting->level]);
}
static ssize_t level_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
int i;
/* Scan for a matching profile */
i = sysfs_match_string(level_options, buf);
if (i < 0)
return -EINVAL;
setting->level = i;
return count;
}
static struct kobj_attribute auth_level = __ATTR_RW(level);
static ssize_t cert_thumbprint(char *buf, const char *arg, int count)
{
const struct acpi_buffer input = { strlen(arg), (char *)arg };
struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
const union acpi_object *obj;
acpi_status status;
status = wmi_evaluate_method(LENOVO_CERT_THUMBPRINT_GUID, 0, 0, &input, &output);
if (ACPI_FAILURE(status)) {
kfree(output.pointer);
return -EIO;
}
obj = output.pointer;
if (!obj)
return -ENOMEM;
if (obj->type != ACPI_TYPE_STRING || !obj->string.pointer) {
kfree(output.pointer);
return -EIO;
}
count += sysfs_emit_at(buf, count, "%s : %s\n", arg, (char *)obj->string.pointer);
kfree(output.pointer);
return count;
}
static ssize_t certificate_thumbprint_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
int count = 0;
if (!tlmi_priv.certificate_support || !setting->cert_installed)
return -EOPNOTSUPP;
count += cert_thumbprint(buf, "Md5", count);
count += cert_thumbprint(buf, "Sha1", count);
count += cert_thumbprint(buf, "Sha256", count);
return count;
}
static struct kobj_attribute auth_cert_thumb = __ATTR_RO(certificate_thumbprint);
static ssize_t cert_to_password_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
char *auth_str, *passwd;
int ret;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!tlmi_priv.certificate_support)
return -EOPNOTSUPP;
if (!setting->cert_installed)
return -EINVAL;
if (!setting->signature || !setting->signature[0])
return -EACCES;
/* Strip out CR if one is present */
passwd = kstrdup_and_replace(buf, '\n', '\0', GFP_KERNEL);
if (!passwd)
return -ENOMEM;
/* Format: 'Password,Signature' */
auth_str = kasprintf(GFP_KERNEL, "%s,%s", passwd, setting->signature);
if (!auth_str) {
kfree_sensitive(passwd);
return -ENOMEM;
}
ret = tlmi_simple_call(LENOVO_CERT_TO_PASSWORD_GUID, auth_str);
kfree(auth_str);
kfree_sensitive(passwd);
return ret ?: count;
}
static struct kobj_attribute auth_cert_to_password = __ATTR_WO(cert_to_password);
static ssize_t certificate_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
char *auth_str, *new_cert;
char *guid;
int ret;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!tlmi_priv.certificate_support)
return -EOPNOTSUPP;
/* If empty then clear installed certificate */
if ((buf[0] == '\0') || (buf[0] == '\n')) { /* Clear installed certificate */
/* Check that signature is set */
if (!setting->signature || !setting->signature[0])
return -EACCES;
/* Format: 'serial#, signature' */
auth_str = kasprintf(GFP_KERNEL, "%s,%s",
dmi_get_system_info(DMI_PRODUCT_SERIAL),
setting->signature);
if (!auth_str)
return -ENOMEM;
ret = tlmi_simple_call(LENOVO_CLEAR_BIOS_CERT_GUID, auth_str);
kfree(auth_str);
return ret ?: count;
}
/* Strip out CR if one is present */
new_cert = kstrdup_and_replace(buf, '\n', '\0', GFP_KERNEL);
if (!new_cert)
return -ENOMEM;
if (setting->cert_installed) {
/* Certificate is installed so this is an update */
if (!setting->signature || !setting->signature[0]) {
kfree(new_cert);
return -EACCES;
}
guid = LENOVO_UPDATE_BIOS_CERT_GUID;
/* Format: 'Certificate,Signature' */
auth_str = kasprintf(GFP_KERNEL, "%s,%s",
new_cert, setting->signature);
} else {
/* This is a fresh install */
if (!setting->valid || !setting->password[0]) {
kfree(new_cert);
return -EACCES;
}
guid = LENOVO_SET_BIOS_CERT_GUID;
/* Format: 'Certificate,Admin-password' */
auth_str = kasprintf(GFP_KERNEL, "%s,%s",
new_cert, setting->password);
}
kfree(new_cert);
if (!auth_str)
return -ENOMEM;
ret = tlmi_simple_call(guid, auth_str);
kfree(auth_str);
return ret ?: count;
}
static struct kobj_attribute auth_certificate = __ATTR_WO(certificate);
static ssize_t signature_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
char *new_signature;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!tlmi_priv.certificate_support)
return -EOPNOTSUPP;
/* Strip out CR if one is present */
new_signature = kstrdup_and_replace(buf, '\n', '\0', GFP_KERNEL);
if (!new_signature)
return -ENOMEM;
/* Free any previous signature */
kfree(setting->signature);
setting->signature = new_signature;
return count;
}
static struct kobj_attribute auth_signature = __ATTR_WO(signature);
static ssize_t save_signature_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
char *new_signature;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!tlmi_priv.certificate_support)
return -EOPNOTSUPP;
/* Strip out CR if one is present */
new_signature = kstrdup_and_replace(buf, '\n', '\0', GFP_KERNEL);
if (!new_signature)
return -ENOMEM;
/* Free any previous signature */
kfree(setting->save_signature);
setting->save_signature = new_signature;
return count;
}
static struct kobj_attribute auth_save_signature = __ATTR_WO(save_signature);
static umode_t auth_attr_is_visible(struct kobject *kobj,
struct attribute *attr, int n)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
/* We only want to display level and index settings on HDD/NVMe */
if (attr == &auth_index.attr || attr == &auth_level.attr) {
if ((setting == tlmi_priv.pwd_hdd) || (setting == tlmi_priv.pwd_nvme))
return attr->mode;
return 0;
}
/* We only display certificates on Admin account, if supported */
if (attr == &auth_certificate.attr ||
attr == &auth_signature.attr ||
attr == &auth_save_signature.attr ||
attr == &auth_cert_thumb.attr ||
attr == &auth_cert_to_password.attr) {
if ((setting == tlmi_priv.pwd_admin) && tlmi_priv.certificate_support)
return attr->mode;
return 0;
}
/* Don't display un-needed settings if opcode available */
if ((attr == &auth_encoding.attr || attr == &auth_kbdlang.attr) &&
tlmi_priv.opcode_support)
return 0;
return attr->mode;
}
static struct attribute *auth_attrs[] = {
&auth_is_pass_set.attr,
&auth_min_pass_length.attr,
&auth_max_pass_length.attr,
&auth_current_password.attr,
&auth_new_password.attr,
&auth_role.attr,
&auth_mechanism.attr,
&auth_encoding.attr,
&auth_kbdlang.attr,
&auth_index.attr,
&auth_level.attr,
&auth_certificate.attr,
&auth_signature.attr,
&auth_save_signature.attr,
&auth_cert_thumb.attr,
&auth_cert_to_password.attr,
NULL
};
static const struct attribute_group auth_attr_group = {
.is_visible = auth_attr_is_visible,
.attrs = auth_attrs,
};
/* ---- Attributes sysfs --------------------------------------------------------- */
static ssize_t display_name_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
struct tlmi_attr_setting *setting = to_tlmi_attr_setting(kobj);
return sysfs_emit(buf, "%s\n", setting->display_name);
}
static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
struct tlmi_attr_setting *setting = to_tlmi_attr_setting(kobj);
char *item, *value;
int ret;
ret = tlmi_setting(setting->index, &item, LENOVO_BIOS_SETTING_GUID);
if (ret)
return ret;
/* validate and split from `item,value` -> `value` */
value = strpbrk(item, ",");
if (!value || value == item || !strlen(value + 1))
ret = -EINVAL;
else {
/* On Workstations remove the Options part after the value */
strreplace(value, ';', '\0');
ret = sysfs_emit(buf, "%s\n", value + 1);
}
kfree(item);
return ret;
}
static ssize_t possible_values_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
struct tlmi_attr_setting *setting = to_tlmi_attr_setting(kobj);
return sysfs_emit(buf, "%s\n", setting->possible_values);
}
static ssize_t type_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
struct tlmi_attr_setting *setting = to_tlmi_attr_setting(kobj);
if (setting->possible_values) {
/* Figure out what setting type is as BIOS does not return this */
if (strchr(setting->possible_values, ';'))
return sysfs_emit(buf, "enumeration\n");
}
/* Anything else is going to be a string */
return sysfs_emit(buf, "string\n");
}
static ssize_t current_value_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
struct tlmi_attr_setting *setting = to_tlmi_attr_setting(kobj);
char *set_str = NULL, *new_setting = NULL;
char *auth_str = NULL;
int ret;
if (!tlmi_priv.can_set_bios_settings)
return -EOPNOTSUPP;
/*
* If we are using bulk saves a reboot should be done once save has
* been called
*/
if (tlmi_priv.save_mode == TLMI_SAVE_BULK && tlmi_priv.reboot_required)
return -EPERM;
/* Strip out CR if one is present */
new_setting = kstrdup_and_replace(buf, '\n', '\0', GFP_KERNEL);
if (!new_setting)
return -ENOMEM;
/* Use lock in case multiple WMI operations needed */
mutex_lock(&tlmi_mutex);
/* Check if certificate authentication is enabled and active */
if (tlmi_priv.certificate_support && tlmi_priv.pwd_admin->cert_installed) {
if (!tlmi_priv.pwd_admin->signature || !tlmi_priv.pwd_admin->save_signature) {
ret = -EINVAL;
goto out;
}
set_str = kasprintf(GFP_KERNEL, "%s,%s,%s", setting->display_name,
new_setting, tlmi_priv.pwd_admin->signature);
if (!set_str) {
ret = -ENOMEM;
goto out;
}
ret = tlmi_simple_call(LENOVO_SET_BIOS_SETTING_CERT_GUID, set_str);
if (ret)
goto out;
if (tlmi_priv.save_mode == TLMI_SAVE_BULK)
tlmi_priv.save_required = true;
else
ret = tlmi_simple_call(LENOVO_SAVE_BIOS_SETTING_CERT_GUID,
tlmi_priv.pwd_admin->save_signature);
} else if (tlmi_priv.opcode_support) {
/*
* If opcode support is present use that interface.
* Note - this sets the variable and then the password as separate
* WMI calls. Function tlmi_save_bios_settings will error if the
* password is incorrect.
* Workstation's require the opcode to be set before changing the
* attribute.
*/
if (tlmi_priv.pwd_admin->valid && tlmi_priv.pwd_admin->password[0]) {
ret = tlmi_opcode_setting("WmiOpcodePasswordAdmin",
tlmi_priv.pwd_admin->password);
if (ret)
goto out;
}
set_str = kasprintf(GFP_KERNEL, "%s,%s;", setting->display_name,
new_setting);
if (!set_str) {
ret = -ENOMEM;
goto out;
}
ret = tlmi_simple_call(LENOVO_SET_BIOS_SETTINGS_GUID, set_str);
if (ret)
goto out;
if (tlmi_priv.save_mode == TLMI_SAVE_BULK)
tlmi_priv.save_required = true;
else
ret = tlmi_save_bios_settings("");
} else { /* old non-opcode based authentication method (deprecated) */
if (tlmi_priv.pwd_admin->valid && tlmi_priv.pwd_admin->password[0]) {
auth_str = kasprintf(GFP_KERNEL, "%s,%s,%s;",
tlmi_priv.pwd_admin->password,
encoding_options[tlmi_priv.pwd_admin->encoding],
tlmi_priv.pwd_admin->kbdlang);
if (!auth_str) {
ret = -ENOMEM;
goto out;
}
}
if (auth_str)
set_str = kasprintf(GFP_KERNEL, "%s,%s,%s", setting->display_name,
new_setting, auth_str);
else
set_str = kasprintf(GFP_KERNEL, "%s,%s;", setting->display_name,
new_setting);
if (!set_str) {
ret = -ENOMEM;
goto out;
}
ret = tlmi_simple_call(LENOVO_SET_BIOS_SETTINGS_GUID, set_str);
if (ret)
goto out;
if (tlmi_priv.save_mode == TLMI_SAVE_BULK) {
tlmi_priv.save_required = true;
} else {
if (auth_str)
ret = tlmi_save_bios_settings(auth_str);
else
ret = tlmi_save_bios_settings("");
}
}
if (!ret && !tlmi_priv.pending_changes) {
tlmi_priv.pending_changes = true;
/* let userland know it may need to check reboot pending again */
kobject_uevent(&tlmi_priv.class_dev->kobj, KOBJ_CHANGE);
}
out:
mutex_unlock(&tlmi_mutex);
kfree(auth_str);
kfree(set_str);
kfree(new_setting);
return ret ?: count;
}
static struct kobj_attribute attr_displ_name = __ATTR_RO(display_name);
static struct kobj_attribute attr_possible_values = __ATTR_RO(possible_values);
static struct kobj_attribute attr_current_val = __ATTR_RW_MODE(current_value, 0600);
static struct kobj_attribute attr_type = __ATTR_RO(type);
static umode_t attr_is_visible(struct kobject *kobj,
struct attribute *attr, int n)
{
struct tlmi_attr_setting *setting = to_tlmi_attr_setting(kobj);
/* We don't want to display possible_values attributes if not available */
if ((attr == &attr_possible_values.attr) && (!setting->possible_values))
return 0;
return attr->mode;
}
static struct attribute *tlmi_attrs[] = {
&attr_displ_name.attr,
&attr_current_val.attr,
&attr_possible_values.attr,
&attr_type.attr,
NULL
};
static const struct attribute_group tlmi_attr_group = {
.is_visible = attr_is_visible,
.attrs = tlmi_attrs,
};
static void tlmi_attr_setting_release(struct kobject *kobj)
{
struct tlmi_attr_setting *setting = to_tlmi_attr_setting(kobj);
kfree(setting->possible_values);
kfree(setting);
}
static void tlmi_pwd_setting_release(struct kobject *kobj)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
kfree(setting);
}
static const struct kobj_type tlmi_attr_setting_ktype = {
.release = &tlmi_attr_setting_release,
.sysfs_ops = &kobj_sysfs_ops,
};
static const struct kobj_type tlmi_pwd_setting_ktype = {
.release = &tlmi_pwd_setting_release,
.sysfs_ops = &kobj_sysfs_ops,
};
static ssize_t pending_reboot_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
return sprintf(buf, "%d\n", tlmi_priv.pending_changes);
}
static struct kobj_attribute pending_reboot = __ATTR_RO(pending_reboot);
static const char * const save_mode_strings[] = {
[TLMI_SAVE_SINGLE] = "single",
[TLMI_SAVE_BULK] = "bulk",
[TLMI_SAVE_SAVE] = "save"
};
static ssize_t save_settings_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
/* Check that setting is valid */
if (WARN_ON(tlmi_priv.save_mode < TLMI_SAVE_SINGLE ||
tlmi_priv.save_mode > TLMI_SAVE_BULK))
return -EIO;
return sysfs_emit(buf, "%s\n", save_mode_strings[tlmi_priv.save_mode]);
}
static ssize_t save_settings_store(struct kobject *kobj, struct kobj_attribute *attr,
const char *buf, size_t count)
{
char *auth_str = NULL;
int ret = 0;
int cmd;
cmd = sysfs_match_string(save_mode_strings, buf);
if (cmd < 0)
return cmd;
/* Use lock in case multiple WMI operations needed */
mutex_lock(&tlmi_mutex);
switch (cmd) {
case TLMI_SAVE_SINGLE:
case TLMI_SAVE_BULK:
tlmi_priv.save_mode = cmd;
goto out;
case TLMI_SAVE_SAVE:
/* Check if supported*/
if (!tlmi_priv.can_set_bios_settings ||
tlmi_priv.save_mode == TLMI_SAVE_SINGLE) {
ret = -EOPNOTSUPP;
goto out;
}
/* Check there is actually something to save */
if (!tlmi_priv.save_required) {
ret = -ENOENT;
goto out;
}
/* Check if certificate authentication is enabled and active */
if (tlmi_priv.certificate_support && tlmi_priv.pwd_admin->cert_installed) {
if (!tlmi_priv.pwd_admin->signature ||
!tlmi_priv.pwd_admin->save_signature) {
ret = -EINVAL;
goto out;
}
ret = tlmi_simple_call(LENOVO_SAVE_BIOS_SETTING_CERT_GUID,
tlmi_priv.pwd_admin->save_signature);
if (ret)
goto out;
} else if (tlmi_priv.opcode_support) {
if (tlmi_priv.pwd_admin->valid && tlmi_priv.pwd_admin->password[0]) {
ret = tlmi_opcode_setting("WmiOpcodePasswordAdmin",
tlmi_priv.pwd_admin->password);
if (ret)
goto out;
}
ret = tlmi_save_bios_settings("");
} else { /* old non-opcode based authentication method (deprecated) */
if (tlmi_priv.pwd_admin->valid && tlmi_priv.pwd_admin->password[0]) {
auth_str = kasprintf(GFP_KERNEL, "%s,%s,%s;",
tlmi_priv.pwd_admin->password,
encoding_options[tlmi_priv.pwd_admin->encoding],
tlmi_priv.pwd_admin->kbdlang);
if (!auth_str) {
ret = -ENOMEM;
goto out;
}
}
if (auth_str)
ret = tlmi_save_bios_settings(auth_str);
else
ret = tlmi_save_bios_settings("");
}
tlmi_priv.save_required = false;
tlmi_priv.reboot_required = true;
if (!ret && !tlmi_priv.pending_changes) {
tlmi_priv.pending_changes = true;
/* let userland know it may need to check reboot pending again */
kobject_uevent(&tlmi_priv.class_dev->kobj, KOBJ_CHANGE);
}
break;
}
out:
mutex_unlock(&tlmi_mutex);
kfree(auth_str);
return ret ?: count;
}
static struct kobj_attribute save_settings = __ATTR_RW(save_settings);
/* ---- Debug interface--------------------------------------------------------- */
static ssize_t debug_cmd_store(struct kobject *kobj, struct kobj_attribute *attr,
const char *buf, size_t count)
{
char *set_str = NULL, *new_setting = NULL;
char *auth_str = NULL;
int ret;
if (!tlmi_priv.can_debug_cmd)
return -EOPNOTSUPP;
/* Strip out CR if one is present */
new_setting = kstrdup_and_replace(buf, '\n', '\0', GFP_KERNEL);
if (!new_setting)
return -ENOMEM;
if (tlmi_priv.pwd_admin->valid && tlmi_priv.pwd_admin->password[0]) {
auth_str = kasprintf(GFP_KERNEL, "%s,%s,%s;",
tlmi_priv.pwd_admin->password,
encoding_options[tlmi_priv.pwd_admin->encoding],
tlmi_priv.pwd_admin->kbdlang);
if (!auth_str) {
ret = -ENOMEM;
goto out;
}
}
if (auth_str)
set_str = kasprintf(GFP_KERNEL, "%s,%s", new_setting, auth_str);
else
set_str = kasprintf(GFP_KERNEL, "%s;", new_setting);
if (!set_str) {
ret = -ENOMEM;
goto out;
}
ret = tlmi_simple_call(LENOVO_DEBUG_CMD_GUID, set_str);
if (ret)
goto out;
if (!ret && !tlmi_priv.pending_changes) {
tlmi_priv.pending_changes = true;
/* let userland know it may need to check reboot pending again */
kobject_uevent(&tlmi_priv.class_dev->kobj, KOBJ_CHANGE);
}
out:
kfree(auth_str);
kfree(set_str);
kfree(new_setting);
return ret ?: count;
}
static struct kobj_attribute debug_cmd = __ATTR_WO(debug_cmd);
/* ---- Initialisation --------------------------------------------------------- */
static void tlmi_release_attr(void)
{
int i;
/* Attribute structures */
for (i = 0; i < TLMI_SETTINGS_COUNT; i++) {
if (tlmi_priv.setting[i]) {
sysfs_remove_group(&tlmi_priv.setting[i]->kobj, &tlmi_attr_group);
kobject_put(&tlmi_priv.setting[i]->kobj);
}
}
sysfs_remove_file(&tlmi_priv.attribute_kset->kobj, &pending_reboot.attr);
sysfs_remove_file(&tlmi_priv.attribute_kset->kobj, &save_settings.attr);
if (tlmi_priv.can_debug_cmd && debug_support)
sysfs_remove_file(&tlmi_priv.attribute_kset->kobj, &debug_cmd.attr);
kset_unregister(tlmi_priv.attribute_kset);
/* Free up any saved signatures */
kfree(tlmi_priv.pwd_admin->signature);
kfree(tlmi_priv.pwd_admin->save_signature);
/* Authentication structures */
sysfs_remove_group(&tlmi_priv.pwd_admin->kobj, &auth_attr_group);
kobject_put(&tlmi_priv.pwd_admin->kobj);
sysfs_remove_group(&tlmi_priv.pwd_power->kobj, &auth_attr_group);
kobject_put(&tlmi_priv.pwd_power->kobj);
if (tlmi_priv.opcode_support) {
sysfs_remove_group(&tlmi_priv.pwd_system->kobj, &auth_attr_group);
kobject_put(&tlmi_priv.pwd_system->kobj);
sysfs_remove_group(&tlmi_priv.pwd_hdd->kobj, &auth_attr_group);
kobject_put(&tlmi_priv.pwd_hdd->kobj);
sysfs_remove_group(&tlmi_priv.pwd_nvme->kobj, &auth_attr_group);
kobject_put(&tlmi_priv.pwd_nvme->kobj);
}
kset_unregister(tlmi_priv.authentication_kset);
}
static int tlmi_validate_setting_name(struct kset *attribute_kset, char *name)
{
struct kobject *duplicate;
if (!strcmp(name, "Reserved"))
return -EINVAL;
duplicate = kset_find_obj(attribute_kset, name);
if (duplicate) {
pr_debug("Duplicate attribute name found - %s\n", name);
/* kset_find_obj() returns a reference */
kobject_put(duplicate);
return -EBUSY;
}
return 0;
}
static int tlmi_sysfs_init(void)
{
int i, ret;
ret = fw_attributes_class_get(&fw_attr_class);
if (ret)
return ret;
tlmi_priv.class_dev = device_create(fw_attr_class, NULL, MKDEV(0, 0),
NULL, "%s", "thinklmi");
if (IS_ERR(tlmi_priv.class_dev)) {
ret = PTR_ERR(tlmi_priv.class_dev);
goto fail_class_created;
}
tlmi_priv.attribute_kset = kset_create_and_add("attributes", NULL,
&tlmi_priv.class_dev->kobj);
if (!tlmi_priv.attribute_kset) {
ret = -ENOMEM;
goto fail_device_created;
}
for (i = 0; i < TLMI_SETTINGS_COUNT; i++) {
/* Check if index is a valid setting - skip if it isn't */
if (!tlmi_priv.setting[i])
continue;
/* check for duplicate or reserved values */
if (tlmi_validate_setting_name(tlmi_priv.attribute_kset,
tlmi_priv.setting[i]->display_name) < 0) {
kfree(tlmi_priv.setting[i]->possible_values);
kfree(tlmi_priv.setting[i]);
tlmi_priv.setting[i] = NULL;
continue;
}
/* Build attribute */
tlmi_priv.setting[i]->kobj.kset = tlmi_priv.attribute_kset;
ret = kobject_add(&tlmi_priv.setting[i]->kobj, NULL,
"%s", tlmi_priv.setting[i]->display_name);
if (ret)
goto fail_create_attr;
ret = sysfs_create_group(&tlmi_priv.setting[i]->kobj, &tlmi_attr_group);
if (ret)
goto fail_create_attr;
}
ret = sysfs_create_file(&tlmi_priv.attribute_kset->kobj, &pending_reboot.attr);
if (ret)
goto fail_create_attr;
ret = sysfs_create_file(&tlmi_priv.attribute_kset->kobj, &save_settings.attr);
if (ret)
goto fail_create_attr;
if (tlmi_priv.can_debug_cmd && debug_support) {
ret = sysfs_create_file(&tlmi_priv.attribute_kset->kobj, &debug_cmd.attr);
if (ret)
goto fail_create_attr;
}
/* Create authentication entries */
tlmi_priv.authentication_kset = kset_create_and_add("authentication", NULL,
&tlmi_priv.class_dev->kobj);
if (!tlmi_priv.authentication_kset) {
ret = -ENOMEM;
goto fail_create_attr;
}
tlmi_priv.pwd_admin->kobj.kset = tlmi_priv.authentication_kset;
ret = kobject_add(&tlmi_priv.pwd_admin->kobj, NULL, "%s", "Admin");
if (ret)
goto fail_create_attr;
ret = sysfs_create_group(&tlmi_priv.pwd_admin->kobj, &auth_attr_group);
if (ret)
goto fail_create_attr;
tlmi_priv.pwd_power->kobj.kset = tlmi_priv.authentication_kset;
ret = kobject_add(&tlmi_priv.pwd_power->kobj, NULL, "%s", "Power-on");
if (ret)
goto fail_create_attr;
ret = sysfs_create_group(&tlmi_priv.pwd_power->kobj, &auth_attr_group);
if (ret)
goto fail_create_attr;
if (tlmi_priv.opcode_support) {
tlmi_priv.pwd_system->kobj.kset = tlmi_priv.authentication_kset;
ret = kobject_add(&tlmi_priv.pwd_system->kobj, NULL, "%s", "System");
if (ret)
goto fail_create_attr;
ret = sysfs_create_group(&tlmi_priv.pwd_system->kobj, &auth_attr_group);
if (ret)
goto fail_create_attr;
tlmi_priv.pwd_hdd->kobj.kset = tlmi_priv.authentication_kset;
ret = kobject_add(&tlmi_priv.pwd_hdd->kobj, NULL, "%s", "HDD");
if (ret)
goto fail_create_attr;
ret = sysfs_create_group(&tlmi_priv.pwd_hdd->kobj, &auth_attr_group);
if (ret)
goto fail_create_attr;
tlmi_priv.pwd_nvme->kobj.kset = tlmi_priv.authentication_kset;
ret = kobject_add(&tlmi_priv.pwd_nvme->kobj, NULL, "%s", "NVMe");
if (ret)
goto fail_create_attr;
ret = sysfs_create_group(&tlmi_priv.pwd_nvme->kobj, &auth_attr_group);
if (ret)
goto fail_create_attr;
}
return ret;
fail_create_attr:
tlmi_release_attr();
fail_device_created:
device_destroy(fw_attr_class, MKDEV(0, 0));
fail_class_created:
fw_attributes_class_put();
return ret;
}
/* ---- Base Driver -------------------------------------------------------- */
static struct tlmi_pwd_setting *tlmi_create_auth(const char *pwd_type,
const char *pwd_role)
{
struct tlmi_pwd_setting *new_pwd;
new_pwd = kzalloc(sizeof(struct tlmi_pwd_setting), GFP_KERNEL);
if (!new_pwd)
return NULL;
strscpy(new_pwd->kbdlang, "us");
new_pwd->encoding = TLMI_ENCODING_ASCII;
new_pwd->pwd_type = pwd_type;
new_pwd->role = pwd_role;
new_pwd->minlen = tlmi_priv.pwdcfg.core.min_length;
new_pwd->maxlen = tlmi_priv.pwdcfg.core.max_length;
new_pwd->index = 0;
kobject_init(&new_pwd->kobj, &tlmi_pwd_setting_ktype);
return new_pwd;
}
static int tlmi_analyze(void)
{
int i, ret;
if (wmi_has_guid(LENOVO_SET_BIOS_SETTINGS_GUID) &&
wmi_has_guid(LENOVO_SAVE_BIOS_SETTINGS_GUID))
tlmi_priv.can_set_bios_settings = true;
if (wmi_has_guid(LENOVO_GET_BIOS_SELECTIONS_GUID))
tlmi_priv.can_get_bios_selections = true;
if (wmi_has_guid(LENOVO_SET_BIOS_PASSWORD_GUID))
tlmi_priv.can_set_bios_password = true;
if (wmi_has_guid(LENOVO_BIOS_PASSWORD_SETTINGS_GUID))
tlmi_priv.can_get_password_settings = true;
if (wmi_has_guid(LENOVO_DEBUG_CMD_GUID))
tlmi_priv.can_debug_cmd = true;
if (wmi_has_guid(LENOVO_OPCODE_IF_GUID))
tlmi_priv.opcode_support = true;
if (wmi_has_guid(LENOVO_SET_BIOS_CERT_GUID) &&
wmi_has_guid(LENOVO_SET_BIOS_SETTING_CERT_GUID) &&
wmi_has_guid(LENOVO_SAVE_BIOS_SETTING_CERT_GUID))
tlmi_priv.certificate_support = true;
/*
* Try to find the number of valid settings of this machine
* and use it to create sysfs attributes.
*/
for (i = 0; i < TLMI_SETTINGS_COUNT; ++i) {
struct tlmi_attr_setting *setting;
char *item = NULL;
tlmi_priv.setting[i] = NULL;
ret = tlmi_setting(i, &item, LENOVO_BIOS_SETTING_GUID);
if (ret)
break;
if (!item)
break;
if (!*item) {
kfree(item);
continue;
}
/* It is not allowed to have '/' for file name. Convert it into '\'. */
strreplace(item, '/', '\\');
/* Remove the value part */
strreplace(item, ',', '\0');
/* Create a setting entry */
setting = kzalloc(sizeof(*setting), GFP_KERNEL);
if (!setting) {
ret = -ENOMEM;
kfree(item);
goto fail_clear_attr;
}
setting->index = i;
strscpy(setting->display_name, item);
/* If BIOS selections supported, load those */
if (tlmi_priv.can_get_bios_selections) {
ret = tlmi_get_bios_selections(setting->display_name,
&setting->possible_values);
if (ret || !setting->possible_values)
pr_info("Error retrieving possible values for %d : %s\n",
i, setting->display_name);
} else {
/*
* Older Thinkstations don't support the bios_selections API.
* Instead they store this as a [Optional:Option1,Option2] section of the
* name string.
* Try and pull that out if it's available.
*/
char *optitem, *optstart, *optend;
if (!tlmi_setting(setting->index, &optitem, LENOVO_BIOS_SETTING_GUID)) {
optstart = strstr(optitem, "[Optional:");
if (optstart) {
optstart += strlen("[Optional:");
optend = strstr(optstart, "]");
if (optend)
setting->possible_values =
kstrndup(optstart, optend - optstart,
GFP_KERNEL);
}
kfree(optitem);
}
}
/*
* firmware-attributes requires that possible_values are separated by ';' but
* Lenovo FW uses ','. Replace appropriately.
*/
if (setting->possible_values)
strreplace(setting->possible_values, ',', ';');
kobject_init(&setting->kobj, &tlmi_attr_setting_ktype);
tlmi_priv.setting[i] = setting;
kfree(item);
}
/* Create password setting structure */
ret = tlmi_get_pwd_settings(&tlmi_priv.pwdcfg);
if (ret)
goto fail_clear_attr;
/* All failures below boil down to kmalloc failures */
ret = -ENOMEM;
tlmi_priv.pwd_admin = tlmi_create_auth("pap", "bios-admin");
if (!tlmi_priv.pwd_admin)
goto fail_clear_attr;
if (tlmi_priv.pwdcfg.core.password_state & TLMI_PAP_PWD)
tlmi_priv.pwd_admin->valid = true;
tlmi_priv.pwd_power = tlmi_create_auth("pop", "power-on");
if (!tlmi_priv.pwd_power)
goto fail_clear_attr;
if (tlmi_priv.pwdcfg.core.password_state & TLMI_POP_PWD)
tlmi_priv.pwd_power->valid = true;
if (tlmi_priv.opcode_support) {
tlmi_priv.pwd_system = tlmi_create_auth("smp", "system");
if (!tlmi_priv.pwd_system)
goto fail_clear_attr;
if (tlmi_priv.pwdcfg.core.password_state & TLMI_SMP_PWD)
tlmi_priv.pwd_system->valid = true;
tlmi_priv.pwd_hdd = tlmi_create_auth("hdd", "hdd");
if (!tlmi_priv.pwd_hdd)
goto fail_clear_attr;
tlmi_priv.pwd_nvme = tlmi_create_auth("nvm", "nvme");
if (!tlmi_priv.pwd_nvme)
goto fail_clear_attr;
/* Set default hdd/nvme index to 1 as there is no device 0 */
tlmi_priv.pwd_hdd->index = 1;
tlmi_priv.pwd_nvme->index = 1;
if (tlmi_priv.pwdcfg.core.password_state & TLMI_HDD_PWD) {
/* Check if PWD is configured and set index to first drive found */
if (tlmi_priv.pwdcfg.ext.hdd_user_password ||
tlmi_priv.pwdcfg.ext.hdd_master_password) {
tlmi_priv.pwd_hdd->valid = true;
if (tlmi_priv.pwdcfg.ext.hdd_master_password)
tlmi_priv.pwd_hdd->index =
ffs(tlmi_priv.pwdcfg.ext.hdd_master_password) - 1;
else
tlmi_priv.pwd_hdd->index =
ffs(tlmi_priv.pwdcfg.ext.hdd_user_password) - 1;
}
if (tlmi_priv.pwdcfg.ext.nvme_user_password ||
tlmi_priv.pwdcfg.ext.nvme_master_password) {
tlmi_priv.pwd_nvme->valid = true;
if (tlmi_priv.pwdcfg.ext.nvme_master_password)
tlmi_priv.pwd_nvme->index =
ffs(tlmi_priv.pwdcfg.ext.nvme_master_password) - 1;
else
tlmi_priv.pwd_nvme->index =
ffs(tlmi_priv.pwdcfg.ext.nvme_user_password) - 1;
}
}
}
if (tlmi_priv.certificate_support &&
(tlmi_priv.pwdcfg.core.password_state & TLMI_CERT))
tlmi_priv.pwd_admin->cert_installed = true;
return 0;
fail_clear_attr:
for (i = 0; i < TLMI_SETTINGS_COUNT; ++i) {
if (tlmi_priv.setting[i]) {
kfree(tlmi_priv.setting[i]->possible_values);
kfree(tlmi_priv.setting[i]);
}
}
kfree(tlmi_priv.pwd_admin);
kfree(tlmi_priv.pwd_power);
kfree(tlmi_priv.pwd_system);
kfree(tlmi_priv.pwd_hdd);
kfree(tlmi_priv.pwd_nvme);
return ret;
}
static void tlmi_remove(struct wmi_device *wdev)
{
tlmi_release_attr();
device_destroy(fw_attr_class, MKDEV(0, 0));
fw_attributes_class_put();
}
static int tlmi_probe(struct wmi_device *wdev, const void *context)
{
int ret;
ret = tlmi_analyze();
if (ret)
return ret;
return tlmi_sysfs_init();
}
static const struct wmi_device_id tlmi_id_table[] = {
{ .guid_string = LENOVO_BIOS_SETTING_GUID },
{ }
};
MODULE_DEVICE_TABLE(wmi, tlmi_id_table);
static struct wmi_driver tlmi_driver = {
.driver = {
.name = "think-lmi",
},
.id_table = tlmi_id_table,
.probe = tlmi_probe,
.remove = tlmi_remove,
};
MODULE_AUTHOR("Sugumaran L <[email protected]>");
MODULE_AUTHOR("Mark Pearson <[email protected]>");
MODULE_AUTHOR("Corentin Chary <[email protected]>");
MODULE_DESCRIPTION("ThinkLMI Driver");
MODULE_LICENSE("GPL");
module_wmi_driver(tlmi_driver);
Codebase Browser
linux