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Diffstat (limited to 'drivers/firmware/efivars.c')
-rw-r--r--drivers/firmware/efivars.c2117
1 files changed, 0 insertions, 2117 deletions
diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c
deleted file mode 100644
index f4baa11d364..00000000000
--- a/drivers/firmware/efivars.c
+++ /dev/null
@@ -1,2117 +0,0 @@
-/*
- * EFI Variables - efivars.c
- *
- * Copyright (C) 2001,2003,2004 Dell <Matt_Domsch@dell.com>
- * Copyright (C) 2004 Intel Corporation <matthew.e.tolentino@intel.com>
- *
- * 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@dell.com>
- * remove check for efi_enabled in exit
- * add MODULE_VERSION
- *
- * 26 Apr 2004 - Matt Domsch <Matt_Domsch@dell.com>
- * minor bug fixes
- *
- * 21 Apr 2004 - Matt Tolentino <matthew.e.tolentino@intel.com)
- * 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@dell.com>
- * fix locking per Peter Chubb's findings
- *
- * 25 Mar 2002 - Matt Domsch <Matt_Domsch@dell.com>
- * move uuid_unparse() to include/asm-ia64/efi.h:efi_guid_unparse()
- *
- * 12 Feb 2002 - Matt Domsch <Matt_Domsch@dell.com>
- * use list_for_each_safe when deleting vars.
- * remove ifdef CONFIG_SMP around include <linux/smp.h>
- * v0.04 release to linux-ia64@linuxia64.org
- *
- * 20 April 2001 - Matt Domsch <Matt_Domsch@dell.com>
- * Moved vars from /proc/efi to /proc/efi/vars, and made
- * efi.c own the /proc/efi directory.
- * v0.03 release to linux-ia64@linuxia64.org
- *
- * 26 March 2001 - Matt Domsch <Matt_Domsch@dell.com>
- * 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@dell.com>
- * 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@linuxia64.org
- *
- * 26 February 2001 - Matt Domsch <Matt_Domsch@dell.com>
- * v0.01 release to linux-ia64@linuxia64.org
- */
-
-#include <linux/capability.h>
-#include <linux/types.h>
-#include <linux/errno.h>
-#include <linux/init.h>
-#include <linux/mm.h>
-#include <linux/module.h>
-#include <linux/string.h>
-#include <linux/smp.h>
-#include <linux/efi.h>
-#include <linux/sysfs.h>
-#include <linux/kobject.h>
-#include <linux/device.h>
-#include <linux/slab.h>
-#include <linux/pstore.h>
-#include <linux/ctype.h>
-#include <linux/ucs2_string.h>
-
-#include <linux/fs.h>
-#include <linux/ramfs.h>
-#include <linux/pagemap.h>
-
-#include <asm/uaccess.h>
-
-#define EFIVARS_VERSION "0.08"
-#define EFIVARS_DATE "2004-May-17"
-
-MODULE_AUTHOR("Matt Domsch <Matt_Domsch@Dell.com>");
-MODULE_DESCRIPTION("sysfs interface to EFI Variables");
-MODULE_LICENSE("GPL");
-MODULE_VERSION(EFIVARS_VERSION);
-
-#define DUMP_NAME_LEN 52
-
-/*
- * Length of a GUID string (strlen("aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee"))
- * not including trailing NUL
- */
-#define GUID_LEN 36
-
-static bool efivars_pstore_disable =
- IS_ENABLED(CONFIG_EFI_VARS_PSTORE_DEFAULT_DISABLE);
-
-module_param_named(pstore_disable, efivars_pstore_disable, bool, 0644);
-
-/*
- * The maximum size of VariableName + Data = 1024
- * Therefore, it's reasonable to save that much
- * space in each part of the structure,
- * and we use a page for reading/writing.
- */
-
-struct efi_variable {
- efi_char16_t VariableName[1024/sizeof(efi_char16_t)];
- efi_guid_t VendorGuid;
- unsigned long DataSize;
- __u8 Data[1024];
- efi_status_t Status;
- __u32 Attributes;
-} __attribute__((packed));
-
-struct efivar_entry {
- struct efivars *efivars;
- struct efi_variable var;
- struct list_head list;
- struct kobject kobj;
-};
-
-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);
-};
-
-static struct efivars __efivars;
-static struct efivar_operations ops;
-
-#define PSTORE_EFI_ATTRIBUTES \
- (EFI_VARIABLE_NON_VOLATILE | \
- EFI_VARIABLE_BOOTSERVICE_ACCESS | \
- EFI_VARIABLE_RUNTIME_ACCESS)
-
-#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)
-
-/*
- * Prototype for sysfs creation function
- */
-static int
-efivar_create_sysfs_entry(struct efivars *efivars,
- unsigned long variable_name_size,
- efi_char16_t *variable_name,
- efi_guid_t *vendor_guid);
-
-/*
- * Prototype for workqueue functions updating sysfs entry
- */
-
-static void efivar_update_sysfs_entries(struct work_struct *);
-static DECLARE_WORK(efivar_work, efivar_update_sysfs_entries);
-static bool efivar_wq_enabled = true;
-
-static bool
-validate_device_path(struct efi_variable *var, int match, u8 *buffer,
- unsigned long len)
-{
- struct efi_generic_dev_path *node;
- int offset = 0;
-
- node = (struct efi_generic_dev_path *)buffer;
-
- if (len < sizeof(*node))
- return false;
-
- while (offset <= len - sizeof(*node) &&
- node->length >= sizeof(*node) &&
- node->length <= len - offset) {
- offset += node->length;
-
- if ((node->type == EFI_DEV_END_PATH ||
- node->type == EFI_DEV_END_PATH2) &&
- node->sub_type == EFI_DEV_END_ENTIRE)
- return true;
-
- node = (struct efi_generic_dev_path *)(buffer + offset);
- }
-
- /*
- * If we're here then either node->length pointed past the end
- * of the buffer or we reached the end of the buffer without
- * finding a device path end node.
- */
- return false;
-}
-
-static bool
-validate_boot_order(struct efi_variable *var, int match, u8 *buffer,
- unsigned long len)
-{
- /* An array of 16-bit integers */
- if ((len % 2) != 0)
- return false;
-
- return true;
-}
-
-static bool
-validate_load_option(struct efi_variable *var, int match, u8 *buffer,
- unsigned long len)
-{
- u16 filepathlength;
- int i, desclength = 0, namelen;
-
- namelen = ucs2_strnlen(var->VariableName, sizeof(var->VariableName));
-
- /* Either "Boot" or "Driver" followed by four digits of hex */
- for (i = match; i < match+4; i++) {
- if (var->VariableName[i] > 127 ||
- hex_to_bin(var->VariableName[i] & 0xff) < 0)
- return true;
- }
-
- /* Reject it if there's 4 digits of hex and then further content */
- if (namelen > match + 4)
- return false;
-
- /* A valid entry must be at least 8 bytes */
- if (len < 8)
- return false;
-
- filepathlength = buffer[4] | buffer[5] << 8;
-
- /*
- * There's no stored length for the description, so it has to be
- * found by hand
- */
- desclength = ucs2_strsize((efi_char16_t *)(buffer + 6), len - 6) + 2;
-
- /* Each boot entry must have a descriptor */
- if (!desclength)
- return false;
-
- /*
- * If the sum of the length of the description, the claimed filepath
- * length and the original header are greater than the length of the
- * variable, it's malformed
- */
- if ((desclength + filepathlength + 6) > len)
- return false;
-
- /*
- * And, finally, check the filepath
- */
- return validate_device_path(var, match, buffer + desclength + 6,
- filepathlength);
-}
-
-static bool
-validate_uint16(struct efi_variable *var, int match, u8 *buffer,
- unsigned long len)
-{
- /* A single 16-bit integer */
- if (len != 2)
- return false;
-
- return true;
-}
-
-static bool
-validate_ascii_string(struct efi_variable *var, int match, u8 *buffer,
- unsigned long len)
-{
- int i;
-
- for (i = 0; i < len; i++) {
- if (buffer[i] > 127)
- return false;
-
- if (buffer[i] == 0)
- return true;
- }
-
- return false;
-}
-
-struct variable_validate {
- char *name;
- bool (*validate)(struct efi_variable *var, int match, u8 *data,
- unsigned long len);
-};
-
-static const struct variable_validate variable_validate[] = {
- { "BootNext", validate_uint16 },
- { "BootOrder", validate_boot_order },
- { "DriverOrder", validate_boot_order },
- { "Boot*", validate_load_option },
- { "Driver*", validate_load_option },
- { "ConIn", validate_device_path },
- { "ConInDev", validate_device_path },
- { "ConOut", validate_device_path },
- { "ConOutDev", validate_device_path },
- { "ErrOut", validate_device_path },
- { "ErrOutDev", validate_device_path },
- { "Timeout", validate_uint16 },
- { "Lang", validate_ascii_string },
- { "PlatformLang", validate_ascii_string },
- { "", NULL },
-};
-
-static bool
-validate_var(struct efi_variable *var, u8 *data, unsigned long len)
-{
- int i;
- u16 *unicode_name = var->VariableName;
-
- for (i = 0; variable_validate[i].validate != NULL; i++) {
- const char *name = variable_validate[i].name;
- int match;
-
- for (match = 0; ; match++) {
- char c = name[match];
- u16 u = unicode_name[match];
-
- /* All special variables are plain ascii */
- if (u > 127)
- return true;
-
- /* Wildcard in the matching name means we've matched */
- if (c == '*')
- return variable_validate[i].validate(var,
- match, data, len);
-
- /* Case sensitive match */
- if (c != u)
- break;
-
- /* Reached the end of the string while matching */
- if (!c)
- return variable_validate[i].validate(var,
- match, data, len);
- }
- }
-
- return true;
-}
-
-static efi_status_t
-get_var_data_locked(struct efivars *efivars, struct efi_variable *var)
-{
- efi_status_t status;
-
- var->DataSize = 1024;
- status = efivars->ops->get_variable(var->VariableName,
- &var->VendorGuid,
- &var->Attributes,
- &var->DataSize,
- var->Data);
- return status;
-}
-
-static efi_status_t
-get_var_data(struct efivars *efivars, struct efi_variable *var)
-{
- efi_status_t status;
- unsigned long flags;
-
- spin_lock_irqsave(&efivars->lock, flags);
- status = get_var_data_locked(efivars, var);
- spin_unlock_irqrestore(&efivars->lock, flags);
-
- if (status != EFI_SUCCESS) {
- printk(KERN_WARNING "efivars: get_variable() failed 0x%lx!\n",
- status);
- }
- return status;
-}
-
-static efi_status_t
-check_var_size_locked(struct efivars *efivars, u32 attributes,
- unsigned long size)
-{
- const struct efivar_operations *fops = efivars->ops;
-
- if (!efivars->ops->query_variable_store)
- return EFI_UNSUPPORTED;
-
- return fops->query_variable_store(attributes, size);
-}
-
-
-static efi_status_t
-check_var_size(struct efivars *efivars, u32 attributes, unsigned long size)
-{
- efi_status_t status;
- unsigned long flags;
-
- spin_lock_irqsave(&efivars->lock, flags);
- status = check_var_size_locked(efivars, attributes, size);
- spin_unlock_irqrestore(&efivars->lock, flags);
-
- return status;
-}
-
-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;
- efi_status_t status;
-
- if (!entry || !buf)
- return -EINVAL;
-
- status = get_var_data(entry->efivars, var);
- if (status != EFI_SUCCESS)
- 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;
- efi_status_t status;
-
- if (!entry || !buf)
- return -EINVAL;
-
- status = get_var_data(entry->efivars, var);
- if (status != EFI_SUCCESS)
- 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;
- efi_status_t status;
-
- if (!entry || !buf)
- return -EINVAL;
-
- status = get_var_data(entry->efivars, var);
- if (status != EFI_SUCCESS)
- 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;
- struct efivars *efivars = entry->efivars;
- efi_status_t status = EFI_NOT_FOUND;
-
- 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 ||
- validate_var(new_var, new_var->Data, new_var->DataSize) == false) {
- printk(KERN_ERR "efivars: Malformed variable content\n");
- return -EINVAL;
- }
-
- spin_lock_irq(&efivars->lock);
-
- status = check_var_size_locked(efivars, new_var->Attributes,
- new_var->DataSize + ucs2_strsize(new_var->VariableName, 1024));
-
- if (status == EFI_SUCCESS || status == EFI_UNSUPPORTED)
- status = efivars->ops->set_variable(new_var->VariableName,
- &new_var->VendorGuid,
- new_var->Attributes,
- new_var->DataSize,
- new_var->Data);
-
- spin_unlock_irq(&efivars->lock);
-
- if (status != EFI_SUCCESS) {
- printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n",
- status);
- return -EIO;
- }
-
- memcpy(&entry->var, new_var, count);
- return count;
-}
-
-static ssize_t
-efivar_show_raw(struct efivar_entry *entry, char *buf)
-{
- struct efi_variable *var = &entry->var;
- efi_status_t status;
-
- if (!entry || !buf)
- return 0;
-
- status = get_var_data(entry->efivars, var);
- if (status != EFI_SUCCESS)
- return -EIO;
-
- memcpy(buf, var, sizeof(*var));
- 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 int efivarfs_file_open(struct inode *inode, struct file *file)
-{
- file->private_data = inode->i_private;
- return 0;
-}
-
-static int efi_status_to_err(efi_status_t status)
-{
- int err;
-
- switch (status) {
- case EFI_INVALID_PARAMETER:
- err = -EINVAL;
- break;
- case EFI_OUT_OF_RESOURCES:
- err = -ENOSPC;
- break;
- case EFI_DEVICE_ERROR:
- err = -EIO;
- break;
- case EFI_WRITE_PROTECTED:
- err = -EROFS;
- break;
- case EFI_SECURITY_VIOLATION:
- err = -EACCES;
- break;
- case EFI_NOT_FOUND:
- err = -EIO;
- break;
- default:
- err = -EINVAL;
- }
-
- return err;
-}
-
-static ssize_t efivarfs_file_write(struct file *file,
- const char __user *userbuf, size_t count, loff_t *ppos)
-{
- struct efivar_entry *var = file->private_data;
- struct efivars *efivars;
- efi_status_t status;
- void *data;
- u32 attributes;
- struct inode *inode = file->f_mapping->host;
- unsigned long datasize = count - sizeof(attributes);
- unsigned long newdatasize, varsize;
- ssize_t bytes = 0;
-
- if (count < sizeof(attributes))
- return -EINVAL;
-
- if (copy_from_user(&attributes, userbuf, sizeof(attributes)))
- return -EFAULT;
-
- if (attributes & ~(EFI_VARIABLE_MASK))
- return -EINVAL;
-
- efivars = var->efivars;
-
- /*
- * Ensure that the user can't allocate arbitrarily large
- * amounts of memory. Pick a default size of 64K if
- * QueryVariableInfo() isn't supported by the firmware.
- */
-
- varsize = datasize + ucs2_strsize(var->var.VariableName, 1024);
- status = check_var_size(efivars, attributes, varsize);
-
- if (status != EFI_SUCCESS) {
- if (status != EFI_UNSUPPORTED)
- return efi_status_to_err(status);
-
- if (datasize > 65536)
- return -ENOSPC;
- }
-
- data = kmalloc(datasize, GFP_KERNEL);
- if (!data)
- return -ENOMEM;
-
- if (copy_from_user(data, userbuf + sizeof(attributes), datasize)) {
- bytes = -EFAULT;
- goto out;
- }
-
- if (validate_var(&var->var, data, datasize) == false) {
- bytes = -EINVAL;
- goto out;
- }
-
- /*
- * The lock here protects the get_variable call, the conditional
- * set_variable call, and removal of the variable from the efivars
- * list (in the case of an authenticated delete).
- */
- spin_lock_irq(&efivars->lock);
-
- /*
- * Ensure that the available space hasn't shrunk below the safe level
- */
-
- status = check_var_size_locked(efivars, attributes, varsize);
-
- if (status != EFI_SUCCESS && status != EFI_UNSUPPORTED) {
- spin_unlock_irq(&efivars->lock);
- kfree(data);
-
- return efi_status_to_err(status);
- }
-
- status = efivars->ops->set_variable(var->var.VariableName,
- &var->var.VendorGuid,
- attributes, datasize,
- data);
-
- if (status != EFI_SUCCESS) {
- spin_unlock_irq(&efivars->lock);
- kfree(data);
-
- return efi_status_to_err(status);
- }
-
- bytes = count;
-
- /*
- * Writing to the variable may have caused a change in size (which
- * could either be an append or an overwrite), or the variable to be
- * deleted. Perform a GetVariable() so we can tell what actually
- * happened.
- */
- newdatasize = 0;
- status = efivars->ops->get_variable(var->var.VariableName,
- &var->var.VendorGuid,
- NULL, &newdatasize,
- NULL);
-
- if (status == EFI_BUFFER_TOO_SMALL) {
- spin_unlock_irq(&efivars->lock);
- mutex_lock(&inode->i_mutex);
- i_size_write(inode, newdatasize + sizeof(attributes));
- mutex_unlock(&inode->i_mutex);
-
- } else if (status == EFI_NOT_FOUND) {
- list_del(&var->list);
- spin_unlock_irq(&efivars->lock);
- efivar_unregister(var);
- drop_nlink(inode);
- d_delete(file->f_dentry);
- dput(file->f_dentry);
-
- } else {
- spin_unlock_irq(&efivars->lock);
- pr_warn("efivarfs: inconsistent EFI variable implementation? "
- "status = %lx\n", status);
- }
-
-out:
- kfree(data);
-
- return bytes;
-}
-
-static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf,
- size_t count, loff_t *ppos)
-{
- struct efivar_entry *var = file->private_data;
- struct efivars *efivars = var->efivars;
- efi_status_t status;
- unsigned long datasize = 0;
- u32 attributes;
- void *data;
- ssize_t size = 0;
-
- spin_lock_irq(&efivars->lock);
- status = efivars->ops->get_variable(var->var.VariableName,
- &var->var.VendorGuid,
- &attributes, &datasize, NULL);
- spin_unlock_irq(&efivars->lock);
-
- if (status != EFI_BUFFER_TOO_SMALL)
- return efi_status_to_err(status);
-
- data = kmalloc(datasize + sizeof(attributes), GFP_KERNEL);
-
- if (!data)
- return -ENOMEM;
-
- spin_lock_irq(&efivars->lock);
- status = efivars->ops->get_variable(var->var.VariableName,
- &var->var.VendorGuid,
- &attributes, &datasize,
- (data + sizeof(attributes)));
- spin_unlock_irq(&efivars->lock);
-
- if (status != EFI_SUCCESS) {
- size = efi_status_to_err(status);
- goto out_free;
- }
-
- memcpy(data, &attributes, sizeof(attributes));
- size = simple_read_from_buffer(userbuf, count, ppos,
- data, datasize + sizeof(attributes));
-out_free:
- kfree(data);
-
- return size;
-}
-
-static void efivarfs_evict_inode(struct inode *inode)
-{
- clear_inode(inode);
-}
-
-static const struct super_operations efivarfs_ops = {
- .statfs = simple_statfs,
- .drop_inode = generic_delete_inode,
- .evict_inode = efivarfs_evict_inode,
- .show_options = generic_show_options,
-};
-
-static struct super_block *efivarfs_sb;
-
-static const struct inode_operations efivarfs_dir_inode_operations;
-
-static const struct file_operations efivarfs_file_operations = {
- .open = efivarfs_file_open,
- .read = efivarfs_file_read,
- .write = efivarfs_file_write,
- .llseek = no_llseek,
-};
-
-static struct inode *efivarfs_get_inode(struct super_block *sb,
- const struct inode *dir, int mode, dev_t dev)
-{
- struct inode *inode = new_inode(sb);
-
- if (inode) {
- inode->i_ino = get_next_ino();
- inode->i_mode = mode;
- inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
- switch (mode & S_IFMT) {
- case S_IFREG:
- inode->i_fop = &efivarfs_file_operations;
- break;
- case S_IFDIR:
- inode->i_op = &efivarfs_dir_inode_operations;
- inode->i_fop = &simple_dir_operations;
- inc_nlink(inode);
- break;
- }
- }
- return inode;
-}
-
-/*
- * Return true if 'str' is a valid efivarfs filename of the form,
- *
- * VariableName-12345678-1234-1234-1234-1234567891bc
- */
-static bool efivarfs_valid_name(const char *str, int len)
-{
- static const char dashes[GUID_LEN] = {
- [8] = 1, [13] = 1, [18] = 1, [23] = 1
- };
- const char *s = str + len - GUID_LEN;
- int i;
-
- /*
- * We need a GUID, plus at least one letter for the variable name,
- * plus the '-' separator
- */
- if (len < GUID_LEN + 2)
- return false;
-
- /* GUID must be preceded by a '-' */
- if (*(s - 1) != '-')
- return false;
-
- /*
- * Validate that 's' is of the correct format, e.g.
- *
- * 12345678-1234-1234-1234-123456789abc
- */
- for (i = 0; i < GUID_LEN; i++) {
- if (dashes[i]) {
- if (*s++ != '-')
- return false;
- } else {
- if (!isxdigit(*s++))
- return false;
- }
- }
-
- return true;
-}
-
-static void efivarfs_hex_to_guid(const char *str, efi_guid_t *guid)
-{
- guid->b[0] = hex_to_bin(str[6]) << 4 | hex_to_bin(str[7]);
- guid->b[1] = hex_to_bin(str[4]) << 4 | hex_to_bin(str[5]);
- guid->b[2] = hex_to_bin(str[2]) << 4 | hex_to_bin(str[3]);
- guid->b[3] = hex_to_bin(str[0]) << 4 | hex_to_bin(str[1]);
- guid->b[4] = hex_to_bin(str[11]) << 4 | hex_to_bin(str[12]);
- guid->b[5] = hex_to_bin(str[9]) << 4 | hex_to_bin(str[10]);
- guid->b[6] = hex_to_bin(str[16]) << 4 | hex_to_bin(str[17]);
- guid->b[7] = hex_to_bin(str[14]) << 4 | hex_to_bin(str[15]);
- guid->b[8] = hex_to_bin(str[19]) << 4 | hex_to_bin(str[20]);
- guid->b[9] = hex_to_bin(str[21]) << 4 | hex_to_bin(str[22]);
- guid->b[10] = hex_to_bin(str[24]) << 4 | hex_to_bin(str[25]);
- guid->b[11] = hex_to_bin(str[26]) << 4 | hex_to_bin(str[27]);
- guid->b[12] = hex_to_bin(str[28]) << 4 | hex_to_bin(str[29]);
- guid->b[13] = hex_to_bin(str[30]) << 4 | hex_to_bin(str[31]);
- guid->b[14] = hex_to_bin(str[32]) << 4 | hex_to_bin(str[33]);
- guid->b[15] = hex_to_bin(str[34]) << 4 | hex_to_bin(str[35]);
-}
-
-static int efivarfs_create(struct inode *dir, struct dentry *dentry,
- umode_t mode, bool excl)
-{
- struct inode *inode;
- struct efivars *efivars = &__efivars;
- struct efivar_entry *var;
- int namelen, i = 0, err = 0;
-
- if (!efivarfs_valid_name(dentry->d_name.name, dentry->d_name.len))
- return -EINVAL;
-
- inode = efivarfs_get_inode(dir->i_sb, dir, mode, 0);
- if (!inode)
- return -ENOMEM;
-
- var = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL);
- if (!var) {
- err = -ENOMEM;
- goto out;
- }
-
- /* length of the variable name itself: remove GUID and separator */
- namelen = dentry->d_name.len - GUID_LEN - 1;
-
- efivarfs_hex_to_guid(dentry->d_name.name + namelen + 1,
- &var->var.VendorGuid);
-
- for (i = 0; i < namelen; i++)
- var->var.VariableName[i] = dentry->d_name.name[i];
-
- var->var.VariableName[i] = '\0';
-
- inode->i_private = var;
- var->efivars = efivars;
- var->kobj.kset = efivars->kset;
-
- err = kobject_init_and_add(&var->kobj, &efivar_ktype, NULL, "%s",
- dentry->d_name.name);
- if (err)
- goto out;
-
- kobject_uevent(&var->kobj, KOBJ_ADD);
- spin_lock_irq(&efivars->lock);
- list_add(&var->list, &efivars->list);
- spin_unlock_irq(&efivars->lock);
- d_instantiate(dentry, inode);
- dget(dentry);
-out:
- if (err) {
- kfree(var);
- iput(inode);
- }
- return err;
-}
-
-static int efivarfs_unlink(struct inode *dir, struct dentry *dentry)
-{
- struct efivar_entry *var = dentry->d_inode->i_private;
- struct efivars *efivars = var->efivars;
- efi_status_t status;
-
- spin_lock_irq(&efivars->lock);
-
- status = efivars->ops->set_variable(var->var.VariableName,
- &var->var.VendorGuid,
- 0, 0, NULL);
-
- if (status == EFI_SUCCESS || status == EFI_NOT_FOUND) {
- list_del(&var->list);
- spin_unlock_irq(&efivars->lock);
- efivar_unregister(var);
- drop_nlink(dentry->d_inode);
- dput(dentry);
- return 0;
- }
-
- spin_unlock_irq(&efivars->lock);
- return -EINVAL;
-};
-
-/*
- * Compare two efivarfs file names.
- *
- * An efivarfs filename is composed of two parts,
- *
- * 1. A case-sensitive variable name
- * 2. A case-insensitive GUID
- *
- * So we need to perform a case-sensitive match on part 1 and a
- * case-insensitive match on part 2.
- */
-static int efivarfs_d_compare(const struct dentry *parent, const struct inode *pinode,
- const struct dentry *dentry, const struct inode *inode,
- unsigned int len, const char *str,
- const struct qstr *name)
-{
- int guid = len - GUID_LEN;
-
- if (name->len != len)
- return 1;
-
- /* Case-sensitive compare for the variable name */
- if (memcmp(str, name->name, guid))
- return 1;
-
- /* Case-insensitive compare for the GUID */
- return strncasecmp(name->name + guid, str + guid, GUID_LEN);
-}
-
-static int efivarfs_d_hash(const struct dentry *dentry,
- const struct inode *inode, struct qstr *qstr)
-{
- unsigned long hash = init_name_hash();
- const unsigned char *s = qstr->name;
- unsigned int len = qstr->len;
-
- if (!efivarfs_valid_name(s, len))
- return -EINVAL;
-
- while (len-- > GUID_LEN)
- hash = partial_name_hash(*s++, hash);
-
- /* GUID is case-insensitive. */
- while (len--)
- hash = partial_name_hash(tolower(*s++), hash);
-
- qstr->hash = end_name_hash(hash);
- return 0;
-}
-
-/*
- * Retaining negative dentries for an in-memory filesystem just wastes
- * memory and lookup time: arrange for them to be deleted immediately.
- */
-static int efivarfs_delete_dentry(const struct dentry *dentry)
-{
- return 1;
-}
-
-static struct dentry_operations efivarfs_d_ops = {
- .d_compare = efivarfs_d_compare,
- .d_hash = efivarfs_d_hash,
- .d_delete = efivarfs_delete_dentry,
-};
-
-static struct dentry *efivarfs_alloc_dentry(struct dentry *parent, char *name)
-{
- struct dentry *d;
- struct qstr q;
- int err;
-
- q.name = name;
- q.len = strlen(name);
-
- err = efivarfs_d_hash(NULL, NULL, &q);
- if (err)
- return ERR_PTR(err);
-
- d = d_alloc(parent, &q);
- if (d)
- return d;
-
- return ERR_PTR(-ENOMEM);
-}
-
-static int efivarfs_fill_super(struct super_block *sb, void *data, int silent)
-{
- struct inode *inode = NULL;
- struct dentry *root;
- struct efivar_entry *entry, *n;
- struct efivars *efivars = &__efivars;
- char *name;
- int err = -ENOMEM;
-
- efivarfs_sb = sb;
-
- sb->s_maxbytes = MAX_LFS_FILESIZE;
- sb->s_blocksize = PAGE_CACHE_SIZE;
- sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
- sb->s_magic = EFIVARFS_MAGIC;
- sb->s_op = &efivarfs_ops;
- sb->s_d_op = &efivarfs_d_ops;
- sb->s_time_gran = 1;
-
- inode = efivarfs_get_inode(sb, NULL, S_IFDIR | 0755, 0);
- if (!inode)
- return -ENOMEM;
- inode->i_op = &efivarfs_dir_inode_operations;
-
- root = d_make_root(inode);
- sb->s_root = root;
- if (!root)
- return -ENOMEM;
-
- list_for_each_entry_safe(entry, n, &efivars->list, list) {
- struct dentry *dentry, *root = efivarfs_sb->s_root;
- unsigned long size = 0;
- int len, i;
-
- inode = NULL;
-
- len = ucs2_strlen(entry->var.VariableName);
-
- /* name, plus '-', plus GUID, plus NUL*/
- name = kmalloc(len + 1 + GUID_LEN + 1, GFP_ATOMIC);
- if (!name)
- goto fail;
-
- for (i = 0; i < len; i++)
- name[i] = entry->var.VariableName[i] & 0xFF;
-
- name[len] = '-';
-
- efi_guid_unparse(&entry->var.VendorGuid, name + len + 1);
-
- name[len+GUID_LEN+1] = '\0';
-
- inode = efivarfs_get_inode(efivarfs_sb, root->d_inode,
- S_IFREG | 0644, 0);
- if (!inode)
- goto fail_name;
-
- dentry = efivarfs_alloc_dentry(root, name);
- if (IS_ERR(dentry)) {
- err = PTR_ERR(dentry);
- goto fail_inode;
- }
-
- /* copied by the above to local storage in the dentry. */
- kfree(name);
-
- spin_lock_irq(&efivars->lock);
- efivars->ops->get_variable(entry->var.VariableName,
- &entry->var.VendorGuid,
- &entry->var.Attributes,
- &size,
- NULL);
- spin_unlock_irq(&efivars->lock);
-
- mutex_lock(&inode->i_mutex);
- inode->i_private = entry;
- i_size_write(inode, size + sizeof(entry->var.Attributes));
- mutex_unlock(&