Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Originally from efivars.c, |
| 3 | * |
| 4 | * Copyright (C) 2001,2003,2004 Dell <Matt_Domsch@dell.com> |
| 5 | * Copyright (C) 2004 Intel Corporation <matthew.e.tolentino@intel.com> |
| 6 | * |
| 7 | * This code takes all variables accessible from EFI runtime and |
| 8 | * exports them via sysfs |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to the Free Software |
| 22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 23 | * |
| 24 | * Changelog: |
| 25 | * |
| 26 | * 17 May 2004 - Matt Domsch <Matt_Domsch@dell.com> |
| 27 | * remove check for efi_enabled in exit |
| 28 | * add MODULE_VERSION |
| 29 | * |
| 30 | * 26 Apr 2004 - Matt Domsch <Matt_Domsch@dell.com> |
| 31 | * minor bug fixes |
| 32 | * |
| 33 | * 21 Apr 2004 - Matt Tolentino <matthew.e.tolentino@intel.com) |
| 34 | * converted driver to export variable information via sysfs |
| 35 | * and moved to drivers/firmware directory |
| 36 | * bumped revision number to v0.07 to reflect conversion & move |
| 37 | * |
| 38 | * 10 Dec 2002 - Matt Domsch <Matt_Domsch@dell.com> |
| 39 | * fix locking per Peter Chubb's findings |
| 40 | * |
| 41 | * 25 Mar 2002 - Matt Domsch <Matt_Domsch@dell.com> |
| 42 | * move uuid_unparse() to include/asm-ia64/efi.h:efi_guid_unparse() |
| 43 | * |
| 44 | * 12 Feb 2002 - Matt Domsch <Matt_Domsch@dell.com> |
| 45 | * use list_for_each_safe when deleting vars. |
| 46 | * remove ifdef CONFIG_SMP around include <linux/smp.h> |
| 47 | * v0.04 release to linux-ia64@linuxia64.org |
| 48 | * |
| 49 | * 20 April 2001 - Matt Domsch <Matt_Domsch@dell.com> |
| 50 | * Moved vars from /proc/efi to /proc/efi/vars, and made |
| 51 | * efi.c own the /proc/efi directory. |
| 52 | * v0.03 release to linux-ia64@linuxia64.org |
| 53 | * |
| 54 | * 26 March 2001 - Matt Domsch <Matt_Domsch@dell.com> |
| 55 | * At the request of Stephane, moved ownership of /proc/efi |
| 56 | * to efi.c, and now efivars lives under /proc/efi/vars. |
| 57 | * |
| 58 | * 12 March 2001 - Matt Domsch <Matt_Domsch@dell.com> |
| 59 | * Feedback received from Stephane Eranian incorporated. |
| 60 | * efivar_write() checks copy_from_user() return value. |
| 61 | * efivar_read/write() returns proper errno. |
| 62 | * v0.02 release to linux-ia64@linuxia64.org |
| 63 | * |
| 64 | * 26 February 2001 - Matt Domsch <Matt_Domsch@dell.com> |
| 65 | * v0.01 release to linux-ia64@linuxia64.org |
| 66 | */ |
| 67 | |
| 68 | #include <linux/efi.h> |
| 69 | #include <linux/module.h> |
Linus Torvalds | 20b4fb4 | 2013-05-01 17:51:54 -0700 | [diff] [blame] | 70 | #include <linux/slab.h> |
Matt Fleming | a614e19 | 2013-04-30 11:30:24 +0100 | [diff] [blame] | 71 | #include <linux/ucs2_string.h> |
Matt Fleming | e33655a | 2014-03-17 15:36:37 +0000 | [diff] [blame] | 72 | #include <linux/compat.h> |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 73 | |
| 74 | #define EFIVARS_VERSION "0.08" |
| 75 | #define EFIVARS_DATE "2004-May-17" |
| 76 | |
| 77 | MODULE_AUTHOR("Matt Domsch <Matt_Domsch@Dell.com>"); |
| 78 | MODULE_DESCRIPTION("sysfs interface to EFI Variables"); |
| 79 | MODULE_LICENSE("GPL"); |
| 80 | MODULE_VERSION(EFIVARS_VERSION); |
Lee, Chun-Yi | 28d5402 | 2014-07-09 18:39:29 +0800 | [diff] [blame] | 81 | MODULE_ALIAS("platform:efivars"); |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 82 | |
| 83 | LIST_HEAD(efivar_sysfs_list); |
| 84 | EXPORT_SYMBOL_GPL(efivar_sysfs_list); |
| 85 | |
| 86 | static struct kset *efivars_kset; |
| 87 | |
| 88 | static struct bin_attribute *efivars_new_var; |
| 89 | static struct bin_attribute *efivars_del_var; |
| 90 | |
Matt Fleming | e33655a | 2014-03-17 15:36:37 +0000 | [diff] [blame] | 91 | struct compat_efi_variable { |
| 92 | efi_char16_t VariableName[EFI_VAR_NAME_LEN/sizeof(efi_char16_t)]; |
| 93 | efi_guid_t VendorGuid; |
| 94 | __u32 DataSize; |
| 95 | __u8 Data[1024]; |
| 96 | __u32 Status; |
| 97 | __u32 Attributes; |
| 98 | } __packed; |
| 99 | |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 100 | struct efivar_attribute { |
| 101 | struct attribute attr; |
| 102 | ssize_t (*show) (struct efivar_entry *entry, char *buf); |
| 103 | ssize_t (*store)(struct efivar_entry *entry, const char *buf, size_t count); |
| 104 | }; |
| 105 | |
| 106 | #define EFIVAR_ATTR(_name, _mode, _show, _store) \ |
| 107 | struct efivar_attribute efivar_attr_##_name = { \ |
| 108 | .attr = {.name = __stringify(_name), .mode = _mode}, \ |
| 109 | .show = _show, \ |
| 110 | .store = _store, \ |
| 111 | }; |
| 112 | |
| 113 | #define to_efivar_attr(_attr) container_of(_attr, struct efivar_attribute, attr) |
| 114 | #define to_efivar_entry(obj) container_of(obj, struct efivar_entry, kobj) |
| 115 | |
| 116 | /* |
| 117 | * Prototype for sysfs creation function |
| 118 | */ |
| 119 | static int |
| 120 | efivar_create_sysfs_entry(struct efivar_entry *new_var); |
| 121 | |
| 122 | static ssize_t |
| 123 | efivar_guid_read(struct efivar_entry *entry, char *buf) |
| 124 | { |
| 125 | struct efi_variable *var = &entry->var; |
| 126 | char *str = buf; |
| 127 | |
| 128 | if (!entry || !buf) |
| 129 | return 0; |
| 130 | |
| 131 | efi_guid_unparse(&var->VendorGuid, str); |
| 132 | str += strlen(str); |
| 133 | str += sprintf(str, "\n"); |
| 134 | |
| 135 | return str - buf; |
| 136 | } |
| 137 | |
| 138 | static ssize_t |
| 139 | efivar_attr_read(struct efivar_entry *entry, char *buf) |
| 140 | { |
| 141 | struct efi_variable *var = &entry->var; |
| 142 | char *str = buf; |
| 143 | |
| 144 | if (!entry || !buf) |
| 145 | return -EINVAL; |
| 146 | |
| 147 | var->DataSize = 1024; |
| 148 | if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data)) |
| 149 | return -EIO; |
| 150 | |
| 151 | if (var->Attributes & EFI_VARIABLE_NON_VOLATILE) |
| 152 | str += sprintf(str, "EFI_VARIABLE_NON_VOLATILE\n"); |
| 153 | if (var->Attributes & EFI_VARIABLE_BOOTSERVICE_ACCESS) |
| 154 | str += sprintf(str, "EFI_VARIABLE_BOOTSERVICE_ACCESS\n"); |
| 155 | if (var->Attributes & EFI_VARIABLE_RUNTIME_ACCESS) |
| 156 | str += sprintf(str, "EFI_VARIABLE_RUNTIME_ACCESS\n"); |
| 157 | if (var->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) |
| 158 | str += sprintf(str, "EFI_VARIABLE_HARDWARE_ERROR_RECORD\n"); |
| 159 | if (var->Attributes & EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS) |
| 160 | str += sprintf(str, |
| 161 | "EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS\n"); |
| 162 | if (var->Attributes & |
| 163 | EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS) |
| 164 | str += sprintf(str, |
| 165 | "EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS\n"); |
| 166 | if (var->Attributes & EFI_VARIABLE_APPEND_WRITE) |
| 167 | str += sprintf(str, "EFI_VARIABLE_APPEND_WRITE\n"); |
| 168 | return str - buf; |
| 169 | } |
| 170 | |
| 171 | static ssize_t |
| 172 | efivar_size_read(struct efivar_entry *entry, char *buf) |
| 173 | { |
| 174 | struct efi_variable *var = &entry->var; |
| 175 | char *str = buf; |
| 176 | |
| 177 | if (!entry || !buf) |
| 178 | return -EINVAL; |
| 179 | |
| 180 | var->DataSize = 1024; |
| 181 | if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data)) |
| 182 | return -EIO; |
| 183 | |
| 184 | str += sprintf(str, "0x%lx\n", var->DataSize); |
| 185 | return str - buf; |
| 186 | } |
| 187 | |
| 188 | static ssize_t |
| 189 | efivar_data_read(struct efivar_entry *entry, char *buf) |
| 190 | { |
| 191 | struct efi_variable *var = &entry->var; |
| 192 | |
| 193 | if (!entry || !buf) |
| 194 | return -EINVAL; |
| 195 | |
| 196 | var->DataSize = 1024; |
| 197 | if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data)) |
| 198 | return -EIO; |
| 199 | |
| 200 | memcpy(buf, var->Data, var->DataSize); |
| 201 | return var->DataSize; |
| 202 | } |
Matt Fleming | 54d2fbf | 2014-03-17 15:08:34 +0000 | [diff] [blame] | 203 | |
| 204 | static inline int |
| 205 | sanity_check(struct efi_variable *var, efi_char16_t *name, efi_guid_t vendor, |
| 206 | unsigned long size, u32 attributes, u8 *data) |
| 207 | { |
| 208 | /* |
| 209 | * If only updating the variable data, then the name |
| 210 | * and guid should remain the same |
| 211 | */ |
| 212 | if (memcmp(name, var->VariableName, sizeof(var->VariableName)) || |
| 213 | efi_guidcmp(vendor, var->VendorGuid)) { |
| 214 | printk(KERN_ERR "efivars: Cannot edit the wrong variable!\n"); |
| 215 | return -EINVAL; |
| 216 | } |
| 217 | |
| 218 | if ((size <= 0) || (attributes == 0)){ |
| 219 | printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n"); |
| 220 | return -EINVAL; |
| 221 | } |
| 222 | |
| 223 | if ((attributes & ~EFI_VARIABLE_MASK) != 0 || |
| 224 | efivar_validate(name, data, size) == false) { |
| 225 | printk(KERN_ERR "efivars: Malformed variable content\n"); |
| 226 | return -EINVAL; |
| 227 | } |
| 228 | |
| 229 | return 0; |
| 230 | } |
| 231 | |
Matt Fleming | e33655a | 2014-03-17 15:36:37 +0000 | [diff] [blame] | 232 | static inline bool is_compat(void) |
| 233 | { |
| 234 | if (IS_ENABLED(CONFIG_COMPAT) && is_compat_task()) |
| 235 | return true; |
| 236 | |
| 237 | return false; |
| 238 | } |
| 239 | |
| 240 | static void |
| 241 | copy_out_compat(struct efi_variable *dst, struct compat_efi_variable *src) |
| 242 | { |
| 243 | memcpy(dst->VariableName, src->VariableName, EFI_VAR_NAME_LEN); |
| 244 | memcpy(dst->Data, src->Data, sizeof(src->Data)); |
| 245 | |
| 246 | dst->VendorGuid = src->VendorGuid; |
| 247 | dst->DataSize = src->DataSize; |
| 248 | dst->Attributes = src->Attributes; |
| 249 | } |
| 250 | |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 251 | /* |
| 252 | * We allow each variable to be edited via rewriting the |
| 253 | * entire efi variable structure. |
| 254 | */ |
| 255 | static ssize_t |
| 256 | efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count) |
| 257 | { |
| 258 | struct efi_variable *new_var, *var = &entry->var; |
Matt Fleming | bafc84d | 2014-03-16 12:14:49 +0000 | [diff] [blame] | 259 | efi_char16_t *name; |
| 260 | unsigned long size; |
| 261 | efi_guid_t vendor; |
| 262 | u32 attributes; |
| 263 | u8 *data; |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 264 | int err; |
| 265 | |
Matt Fleming | e33655a | 2014-03-17 15:36:37 +0000 | [diff] [blame] | 266 | if (is_compat()) { |
| 267 | struct compat_efi_variable *compat; |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 268 | |
Matt Fleming | e33655a | 2014-03-17 15:36:37 +0000 | [diff] [blame] | 269 | if (count != sizeof(*compat)) |
| 270 | return -EINVAL; |
Matt Fleming | bafc84d | 2014-03-16 12:14:49 +0000 | [diff] [blame] | 271 | |
Matt Fleming | e33655a | 2014-03-17 15:36:37 +0000 | [diff] [blame] | 272 | compat = (struct compat_efi_variable *)buf; |
| 273 | attributes = compat->Attributes; |
| 274 | vendor = compat->VendorGuid; |
| 275 | name = compat->VariableName; |
| 276 | size = compat->DataSize; |
| 277 | data = compat->Data; |
Matt Fleming | bafc84d | 2014-03-16 12:14:49 +0000 | [diff] [blame] | 278 | |
Matt Fleming | e33655a | 2014-03-17 15:36:37 +0000 | [diff] [blame] | 279 | err = sanity_check(var, name, vendor, size, attributes, data); |
| 280 | if (err) |
| 281 | return err; |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 282 | |
Matt Fleming | e33655a | 2014-03-17 15:36:37 +0000 | [diff] [blame] | 283 | copy_out_compat(&entry->var, compat); |
| 284 | } else { |
| 285 | if (count != sizeof(struct efi_variable)) |
| 286 | return -EINVAL; |
| 287 | |
| 288 | new_var = (struct efi_variable *)buf; |
| 289 | |
| 290 | attributes = new_var->Attributes; |
| 291 | vendor = new_var->VendorGuid; |
| 292 | name = new_var->VariableName; |
| 293 | size = new_var->DataSize; |
| 294 | data = new_var->Data; |
| 295 | |
| 296 | err = sanity_check(var, name, vendor, size, attributes, data); |
| 297 | if (err) |
| 298 | return err; |
| 299 | |
| 300 | memcpy(&entry->var, new_var, count); |
| 301 | } |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 302 | |
Matt Fleming | bafc84d | 2014-03-16 12:14:49 +0000 | [diff] [blame] | 303 | err = efivar_entry_set(entry, attributes, size, data, NULL); |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 304 | if (err) { |
| 305 | printk(KERN_WARNING "efivars: set_variable() failed: status=%d\n", err); |
| 306 | return -EIO; |
| 307 | } |
| 308 | |
| 309 | return count; |
| 310 | } |
| 311 | |
| 312 | static ssize_t |
| 313 | efivar_show_raw(struct efivar_entry *entry, char *buf) |
| 314 | { |
| 315 | struct efi_variable *var = &entry->var; |
Matt Fleming | e33655a | 2014-03-17 15:36:37 +0000 | [diff] [blame] | 316 | struct compat_efi_variable *compat; |
| 317 | size_t size; |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 318 | |
| 319 | if (!entry || !buf) |
| 320 | return 0; |
| 321 | |
| 322 | var->DataSize = 1024; |
| 323 | if (efivar_entry_get(entry, &entry->var.Attributes, |
| 324 | &entry->var.DataSize, entry->var.Data)) |
| 325 | return -EIO; |
| 326 | |
Matt Fleming | e33655a | 2014-03-17 15:36:37 +0000 | [diff] [blame] | 327 | if (is_compat()) { |
| 328 | compat = (struct compat_efi_variable *)buf; |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 329 | |
Matt Fleming | e33655a | 2014-03-17 15:36:37 +0000 | [diff] [blame] | 330 | size = sizeof(*compat); |
| 331 | memcpy(compat->VariableName, var->VariableName, |
| 332 | EFI_VAR_NAME_LEN); |
| 333 | memcpy(compat->Data, var->Data, sizeof(compat->Data)); |
| 334 | |
| 335 | compat->VendorGuid = var->VendorGuid; |
| 336 | compat->DataSize = var->DataSize; |
| 337 | compat->Attributes = var->Attributes; |
| 338 | } else { |
| 339 | size = sizeof(*var); |
| 340 | memcpy(buf, var, size); |
| 341 | } |
| 342 | |
| 343 | return size; |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 344 | } |
| 345 | |
| 346 | /* |
| 347 | * Generic read/write functions that call the specific functions of |
| 348 | * the attributes... |
| 349 | */ |
| 350 | static ssize_t efivar_attr_show(struct kobject *kobj, struct attribute *attr, |
| 351 | char *buf) |
| 352 | { |
| 353 | struct efivar_entry *var = to_efivar_entry(kobj); |
| 354 | struct efivar_attribute *efivar_attr = to_efivar_attr(attr); |
| 355 | ssize_t ret = -EIO; |
| 356 | |
| 357 | if (!capable(CAP_SYS_ADMIN)) |
| 358 | return -EACCES; |
| 359 | |
| 360 | if (efivar_attr->show) { |
| 361 | ret = efivar_attr->show(var, buf); |
| 362 | } |
| 363 | return ret; |
| 364 | } |
| 365 | |
| 366 | static ssize_t efivar_attr_store(struct kobject *kobj, struct attribute *attr, |
| 367 | const char *buf, size_t count) |
| 368 | { |
| 369 | struct efivar_entry *var = to_efivar_entry(kobj); |
| 370 | struct efivar_attribute *efivar_attr = to_efivar_attr(attr); |
| 371 | ssize_t ret = -EIO; |
| 372 | |
| 373 | if (!capable(CAP_SYS_ADMIN)) |
| 374 | return -EACCES; |
| 375 | |
| 376 | if (efivar_attr->store) |
| 377 | ret = efivar_attr->store(var, buf, count); |
| 378 | |
| 379 | return ret; |
| 380 | } |
| 381 | |
| 382 | static const struct sysfs_ops efivar_attr_ops = { |
| 383 | .show = efivar_attr_show, |
| 384 | .store = efivar_attr_store, |
| 385 | }; |
| 386 | |
| 387 | static void efivar_release(struct kobject *kobj) |
| 388 | { |
| 389 | struct efivar_entry *var = container_of(kobj, struct efivar_entry, kobj); |
| 390 | kfree(var); |
| 391 | } |
| 392 | |
| 393 | static EFIVAR_ATTR(guid, 0400, efivar_guid_read, NULL); |
| 394 | static EFIVAR_ATTR(attributes, 0400, efivar_attr_read, NULL); |
| 395 | static EFIVAR_ATTR(size, 0400, efivar_size_read, NULL); |
| 396 | static EFIVAR_ATTR(data, 0400, efivar_data_read, NULL); |
| 397 | static EFIVAR_ATTR(raw_var, 0600, efivar_show_raw, efivar_store_raw); |
| 398 | |
| 399 | static struct attribute *def_attrs[] = { |
| 400 | &efivar_attr_guid.attr, |
| 401 | &efivar_attr_size.attr, |
| 402 | &efivar_attr_attributes.attr, |
| 403 | &efivar_attr_data.attr, |
| 404 | &efivar_attr_raw_var.attr, |
| 405 | NULL, |
| 406 | }; |
| 407 | |
| 408 | static struct kobj_type efivar_ktype = { |
| 409 | .release = efivar_release, |
| 410 | .sysfs_ops = &efivar_attr_ops, |
| 411 | .default_attrs = def_attrs, |
| 412 | }; |
| 413 | |
| 414 | static ssize_t efivar_create(struct file *filp, struct kobject *kobj, |
| 415 | struct bin_attribute *bin_attr, |
| 416 | char *buf, loff_t pos, size_t count) |
| 417 | { |
Matt Fleming | e33655a | 2014-03-17 15:36:37 +0000 | [diff] [blame] | 418 | struct compat_efi_variable *compat = (struct compat_efi_variable *)buf; |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 419 | struct efi_variable *new_var = (struct efi_variable *)buf; |
| 420 | struct efivar_entry *new_entry; |
Matt Fleming | e33655a | 2014-03-17 15:36:37 +0000 | [diff] [blame] | 421 | bool need_compat = is_compat(); |
Matt Fleming | a5d92ad | 2014-03-17 10:57:00 +0000 | [diff] [blame] | 422 | efi_char16_t *name; |
Matt Fleming | bafc84d | 2014-03-16 12:14:49 +0000 | [diff] [blame] | 423 | unsigned long size; |
| 424 | u32 attributes; |
| 425 | u8 *data; |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 426 | int err; |
| 427 | |
| 428 | if (!capable(CAP_SYS_ADMIN)) |
| 429 | return -EACCES; |
| 430 | |
Matt Fleming | e33655a | 2014-03-17 15:36:37 +0000 | [diff] [blame] | 431 | if (need_compat) { |
| 432 | if (count != sizeof(*compat)) |
| 433 | return -EINVAL; |
Matt Fleming | e003bbe | 2014-03-17 09:17:28 +0000 | [diff] [blame] | 434 | |
Matt Fleming | e33655a | 2014-03-17 15:36:37 +0000 | [diff] [blame] | 435 | attributes = compat->Attributes; |
| 436 | name = compat->VariableName; |
| 437 | size = compat->DataSize; |
| 438 | data = compat->Data; |
| 439 | } else { |
| 440 | if (count != sizeof(*new_var)) |
| 441 | return -EINVAL; |
| 442 | |
| 443 | attributes = new_var->Attributes; |
| 444 | name = new_var->VariableName; |
| 445 | size = new_var->DataSize; |
| 446 | data = new_var->Data; |
| 447 | } |
Matt Fleming | bafc84d | 2014-03-16 12:14:49 +0000 | [diff] [blame] | 448 | |
| 449 | if ((attributes & ~EFI_VARIABLE_MASK) != 0 || |
Matt Fleming | a5d92ad | 2014-03-17 10:57:00 +0000 | [diff] [blame] | 450 | efivar_validate(name, data, size) == false) { |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 451 | printk(KERN_ERR "efivars: Malformed variable content\n"); |
| 452 | return -EINVAL; |
| 453 | } |
| 454 | |
| 455 | new_entry = kzalloc(sizeof(*new_entry), GFP_KERNEL); |
| 456 | if (!new_entry) |
| 457 | return -ENOMEM; |
| 458 | |
Matt Fleming | e33655a | 2014-03-17 15:36:37 +0000 | [diff] [blame] | 459 | if (need_compat) |
| 460 | copy_out_compat(&new_entry->var, compat); |
| 461 | else |
| 462 | memcpy(&new_entry->var, new_var, sizeof(*new_var)); |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 463 | |
Matt Fleming | bafc84d | 2014-03-16 12:14:49 +0000 | [diff] [blame] | 464 | err = efivar_entry_set(new_entry, attributes, size, |
| 465 | data, &efivar_sysfs_list); |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 466 | if (err) { |
| 467 | if (err == -EEXIST) |
| 468 | err = -EINVAL; |
| 469 | goto out; |
| 470 | } |
| 471 | |
| 472 | if (efivar_create_sysfs_entry(new_entry)) { |
| 473 | printk(KERN_WARNING "efivars: failed to create sysfs entry.\n"); |
| 474 | kfree(new_entry); |
| 475 | } |
| 476 | return count; |
| 477 | |
| 478 | out: |
| 479 | kfree(new_entry); |
| 480 | return err; |
| 481 | } |
| 482 | |
| 483 | static ssize_t efivar_delete(struct file *filp, struct kobject *kobj, |
| 484 | struct bin_attribute *bin_attr, |
| 485 | char *buf, loff_t pos, size_t count) |
| 486 | { |
| 487 | struct efi_variable *del_var = (struct efi_variable *)buf; |
Matt Fleming | e33655a | 2014-03-17 15:36:37 +0000 | [diff] [blame] | 488 | struct compat_efi_variable *compat; |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 489 | struct efivar_entry *entry; |
Matt Fleming | bafc84d | 2014-03-16 12:14:49 +0000 | [diff] [blame] | 490 | efi_char16_t *name; |
| 491 | efi_guid_t vendor; |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 492 | int err = 0; |
| 493 | |
| 494 | if (!capable(CAP_SYS_ADMIN)) |
| 495 | return -EACCES; |
| 496 | |
Matt Fleming | e33655a | 2014-03-17 15:36:37 +0000 | [diff] [blame] | 497 | if (is_compat()) { |
| 498 | if (count != sizeof(*compat)) |
| 499 | return -EINVAL; |
Matt Fleming | e003bbe | 2014-03-17 09:17:28 +0000 | [diff] [blame] | 500 | |
Matt Fleming | e33655a | 2014-03-17 15:36:37 +0000 | [diff] [blame] | 501 | compat = (struct compat_efi_variable *)buf; |
| 502 | name = compat->VariableName; |
| 503 | vendor = compat->VendorGuid; |
| 504 | } else { |
| 505 | if (count != sizeof(*del_var)) |
| 506 | return -EINVAL; |
| 507 | |
| 508 | name = del_var->VariableName; |
| 509 | vendor = del_var->VendorGuid; |
| 510 | } |
Matt Fleming | bafc84d | 2014-03-16 12:14:49 +0000 | [diff] [blame] | 511 | |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 512 | efivar_entry_iter_begin(); |
Matt Fleming | bafc84d | 2014-03-16 12:14:49 +0000 | [diff] [blame] | 513 | entry = efivar_entry_find(name, vendor, &efivar_sysfs_list, true); |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 514 | if (!entry) |
| 515 | err = -EINVAL; |
| 516 | else if (__efivar_entry_delete(entry)) |
| 517 | err = -EIO; |
| 518 | |
Seiji Aguchi | e0d5973 | 2013-10-30 15:27:26 -0400 | [diff] [blame] | 519 | if (err) { |
| 520 | efivar_entry_iter_end(); |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 521 | return err; |
Seiji Aguchi | e0d5973 | 2013-10-30 15:27:26 -0400 | [diff] [blame] | 522 | } |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 523 | |
Seiji Aguchi | e0d5973 | 2013-10-30 15:27:26 -0400 | [diff] [blame] | 524 | if (!entry->scanning) { |
| 525 | efivar_entry_iter_end(); |
| 526 | efivar_unregister(entry); |
| 527 | } else |
| 528 | efivar_entry_iter_end(); |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 529 | |
| 530 | /* It's dead Jim.... */ |
| 531 | return count; |
| 532 | } |
| 533 | |
| 534 | /** |
| 535 | * efivar_create_sysfs_entry - create a new entry in sysfs |
| 536 | * @new_var: efivar entry to create |
| 537 | * |
| 538 | * Returns 1 on failure, 0 on success |
| 539 | */ |
| 540 | static int |
| 541 | efivar_create_sysfs_entry(struct efivar_entry *new_var) |
| 542 | { |
| 543 | int i, short_name_size; |
| 544 | char *short_name; |
| 545 | unsigned long variable_name_size; |
| 546 | efi_char16_t *variable_name; |
| 547 | |
| 548 | variable_name = new_var->var.VariableName; |
Matt Fleming | a614e19 | 2013-04-30 11:30:24 +0100 | [diff] [blame] | 549 | variable_name_size = ucs2_strlen(variable_name) * sizeof(efi_char16_t); |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 550 | |
| 551 | /* |
| 552 | * Length of the variable bytes in ASCII, plus the '-' separator, |
| 553 | * plus the GUID, plus trailing NUL |
| 554 | */ |
| 555 | short_name_size = variable_name_size / sizeof(efi_char16_t) |
| 556 | + 1 + EFI_VARIABLE_GUID_LEN + 1; |
| 557 | |
| 558 | short_name = kzalloc(short_name_size, GFP_KERNEL); |
| 559 | |
Dan Carpenter | 7b2dd6d | 2013-04-30 10:43:44 +0300 | [diff] [blame] | 560 | if (!short_name) |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 561 | return 1; |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 562 | |
| 563 | /* Convert Unicode to normal chars (assume top bits are 0), |
| 564 | ala UTF-8 */ |
| 565 | for (i=0; i < (int)(variable_name_size / sizeof(efi_char16_t)); i++) { |
| 566 | short_name[i] = variable_name[i] & 0xFF; |
| 567 | } |
| 568 | /* This is ugly, but necessary to separate one vendor's |
| 569 | private variables from another's. */ |
| 570 | |
| 571 | *(short_name + strlen(short_name)) = '-'; |
| 572 | efi_guid_unparse(&new_var->var.VendorGuid, |
| 573 | short_name + strlen(short_name)); |
| 574 | |
| 575 | new_var->kobj.kset = efivars_kset; |
| 576 | |
| 577 | i = kobject_init_and_add(&new_var->kobj, &efivar_ktype, |
| 578 | NULL, "%s", short_name); |
| 579 | kfree(short_name); |
| 580 | if (i) |
| 581 | return 1; |
| 582 | |
| 583 | kobject_uevent(&new_var->kobj, KOBJ_ADD); |
| 584 | efivar_entry_add(new_var, &efivar_sysfs_list); |
| 585 | |
| 586 | return 0; |
| 587 | } |
| 588 | |
| 589 | static int |
| 590 | create_efivars_bin_attributes(void) |
| 591 | { |
| 592 | struct bin_attribute *attr; |
| 593 | int error; |
| 594 | |
| 595 | /* new_var */ |
| 596 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); |
| 597 | if (!attr) |
| 598 | return -ENOMEM; |
| 599 | |
| 600 | attr->attr.name = "new_var"; |
| 601 | attr->attr.mode = 0200; |
| 602 | attr->write = efivar_create; |
| 603 | efivars_new_var = attr; |
| 604 | |
| 605 | /* del_var */ |
| 606 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); |
| 607 | if (!attr) { |
| 608 | error = -ENOMEM; |
| 609 | goto out_free; |
| 610 | } |
| 611 | attr->attr.name = "del_var"; |
| 612 | attr->attr.mode = 0200; |
| 613 | attr->write = efivar_delete; |
| 614 | efivars_del_var = attr; |
| 615 | |
| 616 | sysfs_bin_attr_init(efivars_new_var); |
| 617 | sysfs_bin_attr_init(efivars_del_var); |
| 618 | |
| 619 | /* Register */ |
| 620 | error = sysfs_create_bin_file(&efivars_kset->kobj, efivars_new_var); |
| 621 | if (error) { |
| 622 | printk(KERN_ERR "efivars: unable to create new_var sysfs file" |
| 623 | " due to error %d\n", error); |
| 624 | goto out_free; |
| 625 | } |
| 626 | |
| 627 | error = sysfs_create_bin_file(&efivars_kset->kobj, efivars_del_var); |
| 628 | if (error) { |
| 629 | printk(KERN_ERR "efivars: unable to create del_var sysfs file" |
| 630 | " due to error %d\n", error); |
| 631 | sysfs_remove_bin_file(&efivars_kset->kobj, efivars_new_var); |
| 632 | goto out_free; |
| 633 | } |
| 634 | |
| 635 | return 0; |
| 636 | out_free: |
| 637 | kfree(efivars_del_var); |
| 638 | efivars_del_var = NULL; |
| 639 | kfree(efivars_new_var); |
| 640 | efivars_new_var = NULL; |
| 641 | return error; |
| 642 | } |
| 643 | |
| 644 | static int efivar_update_sysfs_entry(efi_char16_t *name, efi_guid_t vendor, |
| 645 | unsigned long name_size, void *data) |
| 646 | { |
| 647 | struct efivar_entry *entry = data; |
| 648 | |
| 649 | if (efivar_entry_find(name, vendor, &efivar_sysfs_list, false)) |
| 650 | return 0; |
| 651 | |
| 652 | memcpy(entry->var.VariableName, name, name_size); |
| 653 | memcpy(&(entry->var.VendorGuid), &vendor, sizeof(efi_guid_t)); |
| 654 | |
| 655 | return 1; |
| 656 | } |
| 657 | |
| 658 | static void efivar_update_sysfs_entries(struct work_struct *work) |
| 659 | { |
| 660 | struct efivar_entry *entry; |
| 661 | int err; |
| 662 | |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 663 | /* Add new sysfs entries */ |
| 664 | while (1) { |
Seiji Aguchi | d51df2c | 2013-05-10 20:45:36 +0000 | [diff] [blame] | 665 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
| 666 | if (!entry) |
| 667 | return; |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 668 | |
| 669 | err = efivar_init(efivar_update_sysfs_entry, entry, |
| 670 | true, false, &efivar_sysfs_list); |
| 671 | if (!err) |
| 672 | break; |
| 673 | |
| 674 | efivar_create_sysfs_entry(entry); |
| 675 | } |
| 676 | |
| 677 | kfree(entry); |
| 678 | } |
| 679 | |
| 680 | static int efivars_sysfs_callback(efi_char16_t *name, efi_guid_t vendor, |
| 681 | unsigned long name_size, void *data) |
| 682 | { |
| 683 | struct efivar_entry *entry; |
| 684 | |
| 685 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
| 686 | if (!entry) |
| 687 | return -ENOMEM; |
| 688 | |
| 689 | memcpy(entry->var.VariableName, name, name_size); |
| 690 | memcpy(&(entry->var.VendorGuid), &vendor, sizeof(efi_guid_t)); |
| 691 | |
| 692 | efivar_create_sysfs_entry(entry); |
| 693 | |
| 694 | return 0; |
| 695 | } |
| 696 | |
| 697 | static int efivar_sysfs_destroy(struct efivar_entry *entry, void *data) |
| 698 | { |
| 699 | efivar_entry_remove(entry); |
| 700 | efivar_unregister(entry); |
| 701 | return 0; |
| 702 | } |
| 703 | |
Bojan Prtvar | 6f9dd30 | 2013-09-03 08:56:20 +0200 | [diff] [blame] | 704 | static void efivars_sysfs_exit(void) |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 705 | { |
| 706 | /* Remove all entries and destroy */ |
| 707 | __efivar_entry_iter(efivar_sysfs_destroy, &efivar_sysfs_list, NULL, NULL); |
| 708 | |
| 709 | if (efivars_new_var) |
| 710 | sysfs_remove_bin_file(&efivars_kset->kobj, efivars_new_var); |
| 711 | if (efivars_del_var) |
| 712 | sysfs_remove_bin_file(&efivars_kset->kobj, efivars_del_var); |
| 713 | kfree(efivars_new_var); |
| 714 | kfree(efivars_del_var); |
| 715 | kset_unregister(efivars_kset); |
| 716 | } |
| 717 | |
| 718 | int efivars_sysfs_init(void) |
| 719 | { |
| 720 | struct kobject *parent_kobj = efivars_kobject(); |
| 721 | int error = 0; |
| 722 | |
Matt Fleming | d320c07 | 2013-07-11 07:30:33 +0100 | [diff] [blame] | 723 | if (!efi_enabled(EFI_RUNTIME_SERVICES)) |
| 724 | return -ENODEV; |
| 725 | |
Tom Gundersen | a9499fa | 2013-02-08 15:37:06 +0000 | [diff] [blame] | 726 | /* No efivars has been registered yet */ |
| 727 | if (!parent_kobj) |
| 728 | return 0; |
| 729 | |
| 730 | printk(KERN_INFO "EFI Variables Facility v%s %s\n", EFIVARS_VERSION, |
| 731 | EFIVARS_DATE); |
| 732 | |
| 733 | efivars_kset = kset_create_and_add("vars", NULL, parent_kobj); |
| 734 | if (!efivars_kset) { |
| 735 | printk(KERN_ERR "efivars: Subsystem registration failed.\n"); |
| 736 | return -ENOMEM; |
| 737 | } |
| 738 | |
| 739 | efivar_init(efivars_sysfs_callback, NULL, false, |
| 740 | true, &efivar_sysfs_list); |
| 741 | |
| 742 | error = create_efivars_bin_attributes(); |
| 743 | if (error) { |
| 744 | efivars_sysfs_exit(); |
| 745 | return error; |
| 746 | } |
| 747 | |
| 748 | INIT_WORK(&efivar_work, efivar_update_sysfs_entries); |
| 749 | |
| 750 | return 0; |
| 751 | } |
| 752 | EXPORT_SYMBOL_GPL(efivars_sysfs_init); |
| 753 | |
| 754 | module_init(efivars_sysfs_init); |
| 755 | module_exit(efivars_sysfs_exit); |