As part of the splitting up of efivars this got renamed to 'sysfs', rename it back to 'efivars' for backwards compatibility. Cc: Matt Fleming <matt.fleming@xxxxxxxxx> Signed-off-by: Tom Gundersen <teg@xxxxxxx> --- drivers/firmware/efi/Kconfig | 2 + drivers/firmware/efi/Makefile | 2 +- drivers/firmware/efi/efivars.c | 555 +++++++++++++++++++++++++++++++++++++++++ drivers/firmware/efi/sysfs.c | 555 ----------------------------------------- 4 files changed, 558 insertions(+), 556 deletions(-) create mode 100644 drivers/firmware/efi/efivars.c delete mode 100644 drivers/firmware/efi/sysfs.c diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig index e83ef8f..8ca7476 100644 --- a/drivers/firmware/efi/Kconfig +++ b/drivers/firmware/efi/Kconfig @@ -41,6 +41,8 @@ config EFI_VARS_SYSFS Subsequent efibootmgr releases may be found at: <http://linux.dell.com/efibootmgr> + If built as a module it will be called efivars. + config EFI_VARS_PSTORE tristate "EFI Variable Persistent Storage" depends on PSTORE diff --git a/drivers/firmware/efi/Makefile b/drivers/firmware/efi/Makefile index 9660b3d..705b63e 100644 --- a/drivers/firmware/efi/Makefile +++ b/drivers/firmware/efi/Makefile @@ -3,6 +3,6 @@ # obj-$(CONFIG_EFI) += efi.o obj-$(CONFIG_EFI_VARS) += vars.o -obj-$(CONFIG_EFI_VARS_SYSFS) += sysfs.o +obj-$(CONFIG_EFI_VARS_SYSFS) += efivars.o obj-$(CONFIG_EFI_VARS_PSTORE) += pstore.o obj-$(CONFIG_EFI_VARS_GENERIC_OPS) += generic-ops.o diff --git a/drivers/firmware/efi/efivars.c b/drivers/firmware/efi/efivars.c new file mode 100644 index 0000000..d61ab95 --- /dev/null +++ b/drivers/firmware/efi/efivars.c @@ -0,0 +1,555 @@ +/* + * Originally from efivars.c, + * + * Copyright (C) 2001,2003,2004 Dell <Matt_Domsch@xxxxxxxx> + * Copyright (C) 2004 Intel Corporation <matthew.e.tolentino@xxxxxxxxx> + * + * This code takes all variables accessible from EFI runtime and + * exports them via sysfs + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * Changelog: + * + * 17 May 2004 - Matt Domsch <Matt_Domsch@xxxxxxxx> + * remove check for efi_enabled in exit + * add MODULE_VERSION + * + * 26 Apr 2004 - Matt Domsch <Matt_Domsch@xxxxxxxx> + * minor bug fixes + * + * 21 Apr 2004 - Matt Tolentino <matthew.e.tolentino@xxxxxxxxx) + * converted driver to export variable information via sysfs + * and moved to drivers/firmware directory + * bumped revision number to v0.07 to reflect conversion & move + * + * 10 Dec 2002 - Matt Domsch <Matt_Domsch@xxxxxxxx> + * fix locking per Peter Chubb's findings + * + * 25 Mar 2002 - Matt Domsch <Matt_Domsch@xxxxxxxx> + * move uuid_unparse() to include/asm-ia64/efi.h:efi_guid_unparse() + * + * 12 Feb 2002 - Matt Domsch <Matt_Domsch@xxxxxxxx> + * use list_for_each_safe when deleting vars. + * remove ifdef CONFIG_SMP around include <linux/smp.h> + * v0.04 release to linux-ia64@xxxxxxxxxxxxx + * + * 20 April 2001 - Matt Domsch <Matt_Domsch@xxxxxxxx> + * Moved vars from /proc/efi to /proc/efi/vars, and made + * efi.c own the /proc/efi directory. + * v0.03 release to linux-ia64@xxxxxxxxxxxxx + * + * 26 March 2001 - Matt Domsch <Matt_Domsch@xxxxxxxx> + * At the request of Stephane, moved ownership of /proc/efi + * to efi.c, and now efivars lives under /proc/efi/vars. + * + * 12 March 2001 - Matt Domsch <Matt_Domsch@xxxxxxxx> + * Feedback received from Stephane Eranian incorporated. + * efivar_write() checks copy_from_user() return value. + * efivar_read/write() returns proper errno. + * v0.02 release to linux-ia64@xxxxxxxxxxxxx + * + * 26 February 2001 - Matt Domsch <Matt_Domsch@xxxxxxxx> + * v0.01 release to linux-ia64@xxxxxxxxxxxxx + */ + +#include <linux/efi.h> +#include <linux/module.h> + +#define EFIVARS_VERSION "0.08" +#define EFIVARS_DATE "2004-May-17" + +MODULE_AUTHOR("Matt Domsch <Matt_Domsch@xxxxxxxx>"); +MODULE_DESCRIPTION("sysfs interface to EFI Variables"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(EFIVARS_VERSION); + + +static struct kset *efivars_kset; + +static struct bin_attribute *efivars_new_var; +static struct bin_attribute *efivars_del_var; + +struct efivar_attribute { + struct attribute attr; + ssize_t (*show) (struct efivar_entry *entry, char *buf); + ssize_t (*store)(struct efivar_entry *entry, const char *buf, size_t count); +}; + +#define EFIVAR_ATTR(_name, _mode, _show, _store) \ +struct efivar_attribute efivar_attr_##_name = { \ + .attr = {.name = __stringify(_name), .mode = _mode}, \ + .show = _show, \ + .store = _store, \ +}; + +#define to_efivar_attr(_attr) container_of(_attr, struct efivar_attribute, attr) +#define to_efivar_entry(obj) container_of(obj, struct efivar_entry, kobj) + +static ssize_t +efivar_guid_read(struct efivar_entry *entry, char *buf) +{ + struct efi_variable *var = &entry->var; + char *str = buf; + + if (!entry || !buf) + return 0; + + efi_guid_unparse(&var->VendorGuid, str); + str += strlen(str); + str += sprintf(str, "\n"); + + return str - buf; +} + +static ssize_t +efivar_attr_read(struct efivar_entry *entry, char *buf) +{ + struct efi_variable *var = &entry->var; + char *str = buf; + + if (!entry || !buf) + return -EINVAL; + + var->DataSize = 1024; + if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data)) + return -EIO; + + if (var->Attributes & EFI_VARIABLE_NON_VOLATILE) + str += sprintf(str, "EFI_VARIABLE_NON_VOLATILE\n"); + if (var->Attributes & EFI_VARIABLE_BOOTSERVICE_ACCESS) + str += sprintf(str, "EFI_VARIABLE_BOOTSERVICE_ACCESS\n"); + if (var->Attributes & EFI_VARIABLE_RUNTIME_ACCESS) + str += sprintf(str, "EFI_VARIABLE_RUNTIME_ACCESS\n"); + if (var->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) + str += sprintf(str, "EFI_VARIABLE_HARDWARE_ERROR_RECORD\n"); + if (var->Attributes & EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS) + str += sprintf(str, + "EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS\n"); + if (var->Attributes & + EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS) + str += sprintf(str, + "EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS\n"); + if (var->Attributes & EFI_VARIABLE_APPEND_WRITE) + str += sprintf(str, "EFI_VARIABLE_APPEND_WRITE\n"); + return str - buf; +} + +static ssize_t +efivar_size_read(struct efivar_entry *entry, char *buf) +{ + struct efi_variable *var = &entry->var; + char *str = buf; + + if (!entry || !buf) + return -EINVAL; + + var->DataSize = 1024; + if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data)) + return -EIO; + + str += sprintf(str, "0x%lx\n", var->DataSize); + return str - buf; +} + +static ssize_t +efivar_data_read(struct efivar_entry *entry, char *buf) +{ + struct efi_variable *var = &entry->var; + + if (!entry || !buf) + return -EINVAL; + + var->DataSize = 1024; + if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data)) + return -EIO; + + memcpy(buf, var->Data, var->DataSize); + return var->DataSize; +} +/* + * We allow each variable to be edited via rewriting the + * entire efi variable structure. + */ +static ssize_t +efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count) +{ + struct efi_variable *new_var, *var = &entry->var; + int err; + + if (count != sizeof(struct efi_variable)) + return -EINVAL; + + new_var = (struct efi_variable *)buf; + /* + * If only updating the variable data, then the name + * and guid should remain the same + */ + if (memcmp(new_var->VariableName, var->VariableName, sizeof(var->VariableName)) || + efi_guidcmp(new_var->VendorGuid, var->VendorGuid)) { + printk(KERN_ERR "efivars: Cannot edit the wrong variable!\n"); + return -EINVAL; + } + + if ((new_var->DataSize <= 0) || (new_var->Attributes == 0)){ + printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n"); + return -EINVAL; + } + + if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 || + efivar_validate(new_var, new_var->Data, new_var->DataSize) == false) { + printk(KERN_ERR "efivars: Malformed variable content\n"); + return -EINVAL; + } + + memcpy(&entry->var, new_var, count); + + err = efivar_entry_set(entry, new_var->Attributes, + new_var->DataSize, new_var->Data, false); + if (err) { + printk(KERN_WARNING "efivars: set_variable() failed: status=%d\n", err); + return -EIO; + } + + return count; +} + +static ssize_t +efivar_show_raw(struct efivar_entry *entry, char *buf) +{ + struct efi_variable *var = &entry->var; + + if (!entry || !buf) + return 0; + + memcpy(buf, var, sizeof(*var)); + + if (efivar_entry_get(entry, &entry->var.Attributes, + &entry->var.DataSize, entry->var.Data)) + return -EIO; + + return sizeof(*var); +} + +/* + * Generic read/write functions that call the specific functions of + * the attributes... + */ +static ssize_t efivar_attr_show(struct kobject *kobj, struct attribute *attr, + char *buf) +{ + struct efivar_entry *var = to_efivar_entry(kobj); + struct efivar_attribute *efivar_attr = to_efivar_attr(attr); + ssize_t ret = -EIO; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + if (efivar_attr->show) { + ret = efivar_attr->show(var, buf); + } + return ret; +} + +static ssize_t efivar_attr_store(struct kobject *kobj, struct attribute *attr, + const char *buf, size_t count) +{ + struct efivar_entry *var = to_efivar_entry(kobj); + struct efivar_attribute *efivar_attr = to_efivar_attr(attr); + ssize_t ret = -EIO; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + if (efivar_attr->store) + ret = efivar_attr->store(var, buf, count); + + return ret; +} + +static const struct sysfs_ops efivar_attr_ops = { + .show = efivar_attr_show, + .store = efivar_attr_store, +}; + +static void efivar_release(struct kobject *kobj) +{ + struct efivar_entry *var = container_of(kobj, struct efivar_entry, kobj); + kfree(var); +} + +static EFIVAR_ATTR(guid, 0400, efivar_guid_read, NULL); +static EFIVAR_ATTR(attributes, 0400, efivar_attr_read, NULL); +static EFIVAR_ATTR(size, 0400, efivar_size_read, NULL); +static EFIVAR_ATTR(data, 0400, efivar_data_read, NULL); +static EFIVAR_ATTR(raw_var, 0600, efivar_show_raw, efivar_store_raw); + +static struct attribute *def_attrs[] = { + &efivar_attr_guid.attr, + &efivar_attr_size.attr, + &efivar_attr_attributes.attr, + &efivar_attr_data.attr, + &efivar_attr_raw_var.attr, + NULL, +}; + +static struct kobj_type efivar_ktype = { + .release = efivar_release, + .sysfs_ops = &efivar_attr_ops, + .default_attrs = def_attrs, +}; + +static inline void +efivar_unregister(struct efivar_entry *var) +{ + kobject_put(&var->kobj); +} + +static ssize_t efivar_create(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t pos, size_t count) +{ + struct efi_variable *new_var = (struct efi_variable *)buf; + struct efivar_entry *new_entry; + efi_status_t status = EFI_NOT_FOUND; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 || + efivar_validate(new_var, new_var->Data, new_var->DataSize) == false) { + printk(KERN_ERR "efivars: Malformed variable content\n"); + return -EINVAL; + } + + new_entry = kmalloc(sizeof(*new_entry), GFP_KERNEL); + if (!new_entry) + return -ENOMEM; + + memcpy(&new_entry->var, new_var, sizeof(*new_var)); + + status = efivar_entry_set(new_entry, new_var->Attributes, + new_var->DataSize, new_var->Data, true); + if (status == -EEXIST) + return -EINVAL; + + if (status) + return status; + + status = efivar_create_sysfs_entry(new_entry); + if (status) { + kfree(new_entry); + printk(KERN_WARNING "efivars: failed to create sysfs entry.\n"); + } + return count; +} + +static ssize_t efivar_delete(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t pos, size_t count) +{ + struct efi_variable *del_var = (struct efi_variable *)buf; + struct efivar_entry *entry; + int err; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + efivar_entry_iter_begin(); + entry = efivar_entry_find(del_var->VariableName, + del_var->VendorGuid, true); + if (!entry) + err = -EINVAL; + else + err = __efivar_entry_delete(entry); + efivar_entry_iter_end(); + + if (err) + return -EIO; + + efivar_unregister(entry); + + /* It's dead Jim.... */ + return count; +} + +/* + * efivar_create_sysfs_entry() + * Requires: + * variable_name_size = number of bytes required to hold + * variable_name (not counting the NULL + * character at the end. + * Returns 1 on failure, 0 on success + */ +int +efivar_create_sysfs_entry(struct efivar_entry *new_var) +{ + int i, short_name_size; + char *short_name; + unsigned long variable_name_size; + efi_char16_t *variable_name; + + variable_name = new_var->var.VariableName; + variable_name_size = utf16_strlen(variable_name) * sizeof(efi_char16_t); + + /* + * Length of the variable bytes in ASCII, plus the '-' separator, + * plus the GUID, plus trailing NUL + */ + short_name_size = variable_name_size / sizeof(efi_char16_t) + + 1 + EFI_VARIABLE_GUID_LEN + 1; + + short_name = kzalloc(short_name_size, GFP_KERNEL); + + if (!short_name) { + kfree(short_name); + return 1; + } + + /* Convert Unicode to normal chars (assume top bits are 0), + ala UTF-8 */ + for (i=0; i < (int)(variable_name_size / sizeof(efi_char16_t)); i++) { + short_name[i] = variable_name[i] & 0xFF; + } + /* This is ugly, but necessary to separate one vendor's + private variables from another's. */ + + *(short_name + strlen(short_name)) = '-'; + efi_guid_unparse(&new_var->var.VendorGuid, + short_name + strlen(short_name)); + + new_var->kobj.kset = efivars_kset; + + i = kobject_init_and_add(&new_var->kobj, &efivar_ktype, + NULL, "%s", short_name); + kfree(short_name); + if (i) + return 1; + + kobject_uevent(&new_var->kobj, KOBJ_ADD); + efivar_entry_add(new_var); + return 0; +} +EXPORT_SYMBOL_GPL(efivar_create_sysfs_entry); + +static int +create_efivars_bin_attributes(void) +{ + struct bin_attribute *attr; + int error; + + /* new_var */ + attr = kzalloc(sizeof(*attr), GFP_KERNEL); + if (!attr) + return -ENOMEM; + + attr->attr.name = "new_var"; + attr->attr.mode = 0200; + attr->write = efivar_create; + efivars_new_var = attr; + + /* del_var */ + attr = kzalloc(sizeof(*attr), GFP_KERNEL); + if (!attr) { + error = -ENOMEM; + goto out_free; + } + attr->attr.name = "del_var"; + attr->attr.mode = 0200; + attr->write = efivar_delete; + efivars_del_var = attr; + + sysfs_bin_attr_init(efivars_new_var); + sysfs_bin_attr_init(efivars_del_var); + + /* Register */ + error = sysfs_create_bin_file(&efivars_kset->kobj, efivars_new_var); + if (error) { + printk(KERN_ERR "efivars: unable to create new_var sysfs file" + " due to error %d\n", error); + goto out_free; + } + + error = sysfs_create_bin_file(&efivars_kset->kobj, efivars_del_var); + if (error) { + printk(KERN_ERR "efivars: unable to create del_var sysfs file" + " due to error %d\n", error); + sysfs_remove_bin_file(&efivars_kset->kobj, efivars_new_var); + goto out_free; + } + + return 0; +out_free: + kfree(efivars_del_var); + efivars_del_var = NULL; + kfree(efivars_new_var); + efivars_new_var = NULL; + return error; +} + +static int efivars_sysfs_callback(struct efivar_entry *entry, void *data) +{ + efivar_create_sysfs_entry(entry); + return 0; +} + +static int efivar_sysfs_destroy(struct efivar_entry *entry, void *data) +{ + efivar_entry_remove(entry); + efivar_unregister(entry); + return 0; +} + +void efivars_sysfs_exit(void) +{ + /* Remove all entries and destroy */ + __efivar_entry_iter(efivar_sysfs_destroy, NULL, NULL); + + if (efivars_new_var) + sysfs_remove_bin_file(&efivars_kset->kobj, efivars_new_var); + if (efivars_del_var) + sysfs_remove_bin_file(&efivars_kset->kobj, efivars_del_var); + kfree(efivars_new_var); + kfree(efivars_del_var); + kset_unregister(efivars_kset); +} + +int efivars_sysfs_init(void) +{ + int error = 0; + + printk(KERN_INFO "EFI Variables Facility v%s %s\n", EFIVARS_VERSION, + EFIVARS_DATE); + +#if defined(CONFIG_EFI_VARS_GENERIC_OPS) + efivars_kset = kset_create_and_add("vars", NULL, efi_kobj); +#elif defined(CONFIG_GOOGLE_SMI) || defined(CONFIG_GOOGLE_SMI_MODULE) + efivars_kset = kset_create_and_add("vars", NULL, gsmi_kobj); +#endif + if (!efivars_kset) { + pr_err("efivars: Subsystem registration failed.\n"); + return -ENOMEM; + } + + efivar_init(efivars_sysfs_callback, NULL); + + error = create_efivars_bin_attributes(); + if (error) + efivars_sysfs_exit(); + + return error; +} + +module_init(efivars_sysfs_init); diff --git a/drivers/firmware/efi/sysfs.c b/drivers/firmware/efi/sysfs.c deleted file mode 100644 index d61ab95..0000000 --- a/drivers/firmware/efi/sysfs.c +++ /dev/null @@ -1,555 +0,0 @@ -/* - * Originally from efivars.c, - * - * Copyright (C) 2001,2003,2004 Dell <Matt_Domsch@xxxxxxxx> - * Copyright (C) 2004 Intel Corporation <matthew.e.tolentino@xxxxxxxxx> - * - * This code takes all variables accessible from EFI runtime and - * exports them via sysfs - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * - * Changelog: - * - * 17 May 2004 - Matt Domsch <Matt_Domsch@xxxxxxxx> - * remove check for efi_enabled in exit - * add MODULE_VERSION - * - * 26 Apr 2004 - Matt Domsch <Matt_Domsch@xxxxxxxx> - * minor bug fixes - * - * 21 Apr 2004 - Matt Tolentino <matthew.e.tolentino@xxxxxxxxx) - * converted driver to export variable information via sysfs - * and moved to drivers/firmware directory - * bumped revision number to v0.07 to reflect conversion & move - * - * 10 Dec 2002 - Matt Domsch <Matt_Domsch@xxxxxxxx> - * fix locking per Peter Chubb's findings - * - * 25 Mar 2002 - Matt Domsch <Matt_Domsch@xxxxxxxx> - * move uuid_unparse() to include/asm-ia64/efi.h:efi_guid_unparse() - * - * 12 Feb 2002 - Matt Domsch <Matt_Domsch@xxxxxxxx> - * use list_for_each_safe when deleting vars. - * remove ifdef CONFIG_SMP around include <linux/smp.h> - * v0.04 release to linux-ia64@xxxxxxxxxxxxx - * - * 20 April 2001 - Matt Domsch <Matt_Domsch@xxxxxxxx> - * Moved vars from /proc/efi to /proc/efi/vars, and made - * efi.c own the /proc/efi directory. - * v0.03 release to linux-ia64@xxxxxxxxxxxxx - * - * 26 March 2001 - Matt Domsch <Matt_Domsch@xxxxxxxx> - * At the request of Stephane, moved ownership of /proc/efi - * to efi.c, and now efivars lives under /proc/efi/vars. - * - * 12 March 2001 - Matt Domsch <Matt_Domsch@xxxxxxxx> - * Feedback received from Stephane Eranian incorporated. - * efivar_write() checks copy_from_user() return value. - * efivar_read/write() returns proper errno. - * v0.02 release to linux-ia64@xxxxxxxxxxxxx - * - * 26 February 2001 - Matt Domsch <Matt_Domsch@xxxxxxxx> - * v0.01 release to linux-ia64@xxxxxxxxxxxxx - */ - -#include <linux/efi.h> -#include <linux/module.h> - -#define EFIVARS_VERSION "0.08" -#define EFIVARS_DATE "2004-May-17" - -MODULE_AUTHOR("Matt Domsch <Matt_Domsch@xxxxxxxx>"); -MODULE_DESCRIPTION("sysfs interface to EFI Variables"); -MODULE_LICENSE("GPL"); -MODULE_VERSION(EFIVARS_VERSION); - - -static struct kset *efivars_kset; - -static struct bin_attribute *efivars_new_var; -static struct bin_attribute *efivars_del_var; - -struct efivar_attribute { - struct attribute attr; - ssize_t (*show) (struct efivar_entry *entry, char *buf); - ssize_t (*store)(struct efivar_entry *entry, const char *buf, size_t count); -}; - -#define EFIVAR_ATTR(_name, _mode, _show, _store) \ -struct efivar_attribute efivar_attr_##_name = { \ - .attr = {.name = __stringify(_name), .mode = _mode}, \ - .show = _show, \ - .store = _store, \ -}; - -#define to_efivar_attr(_attr) container_of(_attr, struct efivar_attribute, attr) -#define to_efivar_entry(obj) container_of(obj, struct efivar_entry, kobj) - -static ssize_t -efivar_guid_read(struct efivar_entry *entry, char *buf) -{ - struct efi_variable *var = &entry->var; - char *str = buf; - - if (!entry || !buf) - return 0; - - efi_guid_unparse(&var->VendorGuid, str); - str += strlen(str); - str += sprintf(str, "\n"); - - return str - buf; -} - -static ssize_t -efivar_attr_read(struct efivar_entry *entry, char *buf) -{ - struct efi_variable *var = &entry->var; - char *str = buf; - - if (!entry || !buf) - return -EINVAL; - - var->DataSize = 1024; - if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data)) - return -EIO; - - if (var->Attributes & EFI_VARIABLE_NON_VOLATILE) - str += sprintf(str, "EFI_VARIABLE_NON_VOLATILE\n"); - if (var->Attributes & EFI_VARIABLE_BOOTSERVICE_ACCESS) - str += sprintf(str, "EFI_VARIABLE_BOOTSERVICE_ACCESS\n"); - if (var->Attributes & EFI_VARIABLE_RUNTIME_ACCESS) - str += sprintf(str, "EFI_VARIABLE_RUNTIME_ACCESS\n"); - if (var->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) - str += sprintf(str, "EFI_VARIABLE_HARDWARE_ERROR_RECORD\n"); - if (var->Attributes & EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS) - str += sprintf(str, - "EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS\n"); - if (var->Attributes & - EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS) - str += sprintf(str, - "EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS\n"); - if (var->Attributes & EFI_VARIABLE_APPEND_WRITE) - str += sprintf(str, "EFI_VARIABLE_APPEND_WRITE\n"); - return str - buf; -} - -static ssize_t -efivar_size_read(struct efivar_entry *entry, char *buf) -{ - struct efi_variable *var = &entry->var; - char *str = buf; - - if (!entry || !buf) - return -EINVAL; - - var->DataSize = 1024; - if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data)) - return -EIO; - - str += sprintf(str, "0x%lx\n", var->DataSize); - return str - buf; -} - -static ssize_t -efivar_data_read(struct efivar_entry *entry, char *buf) -{ - struct efi_variable *var = &entry->var; - - if (!entry || !buf) - return -EINVAL; - - var->DataSize = 1024; - if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data)) - return -EIO; - - memcpy(buf, var->Data, var->DataSize); - return var->DataSize; -} -/* - * We allow each variable to be edited via rewriting the - * entire efi variable structure. - */ -static ssize_t -efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count) -{ - struct efi_variable *new_var, *var = &entry->var; - int err; - - if (count != sizeof(struct efi_variable)) - return -EINVAL; - - new_var = (struct efi_variable *)buf; - /* - * If only updating the variable data, then the name - * and guid should remain the same - */ - if (memcmp(new_var->VariableName, var->VariableName, sizeof(var->VariableName)) || - efi_guidcmp(new_var->VendorGuid, var->VendorGuid)) { - printk(KERN_ERR "efivars: Cannot edit the wrong variable!\n"); - return -EINVAL; - } - - if ((new_var->DataSize <= 0) || (new_var->Attributes == 0)){ - printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n"); - return -EINVAL; - } - - if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 || - efivar_validate(new_var, new_var->Data, new_var->DataSize) == false) { - printk(KERN_ERR "efivars: Malformed variable content\n"); - return -EINVAL; - } - - memcpy(&entry->var, new_var, count); - - err = efivar_entry_set(entry, new_var->Attributes, - new_var->DataSize, new_var->Data, false); - if (err) { - printk(KERN_WARNING "efivars: set_variable() failed: status=%d\n", err); - return -EIO; - } - - return count; -} - -static ssize_t -efivar_show_raw(struct efivar_entry *entry, char *buf) -{ - struct efi_variable *var = &entry->var; - - if (!entry || !buf) - return 0; - - memcpy(buf, var, sizeof(*var)); - - if (efivar_entry_get(entry, &entry->var.Attributes, - &entry->var.DataSize, entry->var.Data)) - return -EIO; - - return sizeof(*var); -} - -/* - * Generic read/write functions that call the specific functions of - * the attributes... - */ -static ssize_t efivar_attr_show(struct kobject *kobj, struct attribute *attr, - char *buf) -{ - struct efivar_entry *var = to_efivar_entry(kobj); - struct efivar_attribute *efivar_attr = to_efivar_attr(attr); - ssize_t ret = -EIO; - - if (!capable(CAP_SYS_ADMIN)) - return -EACCES; - - if (efivar_attr->show) { - ret = efivar_attr->show(var, buf); - } - return ret; -} - -static ssize_t efivar_attr_store(struct kobject *kobj, struct attribute *attr, - const char *buf, size_t count) -{ - struct efivar_entry *var = to_efivar_entry(kobj); - struct efivar_attribute *efivar_attr = to_efivar_attr(attr); - ssize_t ret = -EIO; - - if (!capable(CAP_SYS_ADMIN)) - return -EACCES; - - if (efivar_attr->store) - ret = efivar_attr->store(var, buf, count); - - return ret; -} - -static const struct sysfs_ops efivar_attr_ops = { - .show = efivar_attr_show, - .store = efivar_attr_store, -}; - -static void efivar_release(struct kobject *kobj) -{ - struct efivar_entry *var = container_of(kobj, struct efivar_entry, kobj); - kfree(var); -} - -static EFIVAR_ATTR(guid, 0400, efivar_guid_read, NULL); -static EFIVAR_ATTR(attributes, 0400, efivar_attr_read, NULL); -static EFIVAR_ATTR(size, 0400, efivar_size_read, NULL); -static EFIVAR_ATTR(data, 0400, efivar_data_read, NULL); -static EFIVAR_ATTR(raw_var, 0600, efivar_show_raw, efivar_store_raw); - -static struct attribute *def_attrs[] = { - &efivar_attr_guid.attr, - &efivar_attr_size.attr, - &efivar_attr_attributes.attr, - &efivar_attr_data.attr, - &efivar_attr_raw_var.attr, - NULL, -}; - -static struct kobj_type efivar_ktype = { - .release = efivar_release, - .sysfs_ops = &efivar_attr_ops, - .default_attrs = def_attrs, -}; - -static inline void -efivar_unregister(struct efivar_entry *var) -{ - kobject_put(&var->kobj); -} - -static ssize_t efivar_create(struct file *filp, struct kobject *kobj, - struct bin_attribute *bin_attr, - char *buf, loff_t pos, size_t count) -{ - struct efi_variable *new_var = (struct efi_variable *)buf; - struct efivar_entry *new_entry; - efi_status_t status = EFI_NOT_FOUND; - - if (!capable(CAP_SYS_ADMIN)) - return -EACCES; - - if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 || - efivar_validate(new_var, new_var->Data, new_var->DataSize) == false) { - printk(KERN_ERR "efivars: Malformed variable content\n"); - return -EINVAL; - } - - new_entry = kmalloc(sizeof(*new_entry), GFP_KERNEL); - if (!new_entry) - return -ENOMEM; - - memcpy(&new_entry->var, new_var, sizeof(*new_var)); - - status = efivar_entry_set(new_entry, new_var->Attributes, - new_var->DataSize, new_var->Data, true); - if (status == -EEXIST) - return -EINVAL; - - if (status) - return status; - - status = efivar_create_sysfs_entry(new_entry); - if (status) { - kfree(new_entry); - printk(KERN_WARNING "efivars: failed to create sysfs entry.\n"); - } - return count; -} - -static ssize_t efivar_delete(struct file *filp, struct kobject *kobj, - struct bin_attribute *bin_attr, - char *buf, loff_t pos, size_t count) -{ - struct efi_variable *del_var = (struct efi_variable *)buf; - struct efivar_entry *entry; - int err; - - if (!capable(CAP_SYS_ADMIN)) - return -EACCES; - - efivar_entry_iter_begin(); - entry = efivar_entry_find(del_var->VariableName, - del_var->VendorGuid, true); - if (!entry) - err = -EINVAL; - else - err = __efivar_entry_delete(entry); - efivar_entry_iter_end(); - - if (err) - return -EIO; - - efivar_unregister(entry); - - /* It's dead Jim.... */ - return count; -} - -/* - * efivar_create_sysfs_entry() - * Requires: - * variable_name_size = number of bytes required to hold - * variable_name (not counting the NULL - * character at the end. - * Returns 1 on failure, 0 on success - */ -int -efivar_create_sysfs_entry(struct efivar_entry *new_var) -{ - int i, short_name_size; - char *short_name; - unsigned long variable_name_size; - efi_char16_t *variable_name; - - variable_name = new_var->var.VariableName; - variable_name_size = utf16_strlen(variable_name) * sizeof(efi_char16_t); - - /* - * Length of the variable bytes in ASCII, plus the '-' separator, - * plus the GUID, plus trailing NUL - */ - short_name_size = variable_name_size / sizeof(efi_char16_t) - + 1 + EFI_VARIABLE_GUID_LEN + 1; - - short_name = kzalloc(short_name_size, GFP_KERNEL); - - if (!short_name) { - kfree(short_name); - return 1; - } - - /* Convert Unicode to normal chars (assume top bits are 0), - ala UTF-8 */ - for (i=0; i < (int)(variable_name_size / sizeof(efi_char16_t)); i++) { - short_name[i] = variable_name[i] & 0xFF; - } - /* This is ugly, but necessary to separate one vendor's - private variables from another's. */ - - *(short_name + strlen(short_name)) = '-'; - efi_guid_unparse(&new_var->var.VendorGuid, - short_name + strlen(short_name)); - - new_var->kobj.kset = efivars_kset; - - i = kobject_init_and_add(&new_var->kobj, &efivar_ktype, - NULL, "%s", short_name); - kfree(short_name); - if (i) - return 1; - - kobject_uevent(&new_var->kobj, KOBJ_ADD); - efivar_entry_add(new_var); - return 0; -} -EXPORT_SYMBOL_GPL(efivar_create_sysfs_entry); - -static int -create_efivars_bin_attributes(void) -{ - struct bin_attribute *attr; - int error; - - /* new_var */ - attr = kzalloc(sizeof(*attr), GFP_KERNEL); - if (!attr) - return -ENOMEM; - - attr->attr.name = "new_var"; - attr->attr.mode = 0200; - attr->write = efivar_create; - efivars_new_var = attr; - - /* del_var */ - attr = kzalloc(sizeof(*attr), GFP_KERNEL); - if (!attr) { - error = -ENOMEM; - goto out_free; - } - attr->attr.name = "del_var"; - attr->attr.mode = 0200; - attr->write = efivar_delete; - efivars_del_var = attr; - - sysfs_bin_attr_init(efivars_new_var); - sysfs_bin_attr_init(efivars_del_var); - - /* Register */ - error = sysfs_create_bin_file(&efivars_kset->kobj, efivars_new_var); - if (error) { - printk(KERN_ERR "efivars: unable to create new_var sysfs file" - " due to error %d\n", error); - goto out_free; - } - - error = sysfs_create_bin_file(&efivars_kset->kobj, efivars_del_var); - if (error) { - printk(KERN_ERR "efivars: unable to create del_var sysfs file" - " due to error %d\n", error); - sysfs_remove_bin_file(&efivars_kset->kobj, efivars_new_var); - goto out_free; - } - - return 0; -out_free: - kfree(efivars_del_var); - efivars_del_var = NULL; - kfree(efivars_new_var); - efivars_new_var = NULL; - return error; -} - -static int efivars_sysfs_callback(struct efivar_entry *entry, void *data) -{ - efivar_create_sysfs_entry(entry); - return 0; -} - -static int efivar_sysfs_destroy(struct efivar_entry *entry, void *data) -{ - efivar_entry_remove(entry); - efivar_unregister(entry); - return 0; -} - -void efivars_sysfs_exit(void) -{ - /* Remove all entries and destroy */ - __efivar_entry_iter(efivar_sysfs_destroy, NULL, NULL); - - if (efivars_new_var) - sysfs_remove_bin_file(&efivars_kset->kobj, efivars_new_var); - if (efivars_del_var) - sysfs_remove_bin_file(&efivars_kset->kobj, efivars_del_var); - kfree(efivars_new_var); - kfree(efivars_del_var); - kset_unregister(efivars_kset); -} - -int efivars_sysfs_init(void) -{ - int error = 0; - - printk(KERN_INFO "EFI Variables Facility v%s %s\n", EFIVARS_VERSION, - EFIVARS_DATE); - -#if defined(CONFIG_EFI_VARS_GENERIC_OPS) - efivars_kset = kset_create_and_add("vars", NULL, efi_kobj); -#elif defined(CONFIG_GOOGLE_SMI) || defined(CONFIG_GOOGLE_SMI_MODULE) - efivars_kset = kset_create_and_add("vars", NULL, gsmi_kobj); -#endif - if (!efivars_kset) { - pr_err("efivars: Subsystem registration failed.\n"); - return -ENOMEM; - } - - efivar_init(efivars_sysfs_callback, NULL); - - error = create_efivars_bin_attributes(); - if (error) - efivars_sysfs_exit(); - - return error; -} - -module_init(efivars_sysfs_init); -- 1.8.1.3 -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
