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1da177e4 LT |
1 | /* |
2 | * EFI Variables - 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 | ||
c59ede7b | 68 | #include <linux/capability.h> |
1da177e4 LT |
69 | #include <linux/types.h> |
70 | #include <linux/errno.h> | |
71 | #include <linux/init.h> | |
1da177e4 LT |
72 | #include <linux/mm.h> |
73 | #include <linux/module.h> | |
74 | #include <linux/string.h> | |
75 | #include <linux/smp.h> | |
76 | #include <linux/efi.h> | |
77 | #include <linux/sysfs.h> | |
78 | #include <linux/kobject.h> | |
79 | #include <linux/device.h> | |
5a0e3ad6 | 80 | #include <linux/slab.h> |
5ee9c198 | 81 | #include <linux/pstore.h> |
47f531e8 | 82 | #include <linux/ctype.h> |
1da177e4 | 83 | |
5d9db883 MG |
84 | #include <linux/fs.h> |
85 | #include <linux/ramfs.h> | |
86 | #include <linux/pagemap.h> | |
87 | ||
1da177e4 LT |
88 | #include <asm/uaccess.h> |
89 | ||
90 | #define EFIVARS_VERSION "0.08" | |
91 | #define EFIVARS_DATE "2004-May-17" | |
92 | ||
93 | MODULE_AUTHOR("Matt Domsch <Matt_Domsch@Dell.com>"); | |
94 | MODULE_DESCRIPTION("sysfs interface to EFI Variables"); | |
95 | MODULE_LICENSE("GPL"); | |
96 | MODULE_VERSION(EFIVARS_VERSION); | |
97 | ||
5ee9c198 MG |
98 | #define DUMP_NAME_LEN 52 |
99 | ||
310ad754 JK |
100 | /* |
101 | * Length of a GUID string (strlen("aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee")) | |
102 | * not including trailing NUL | |
103 | */ | |
104 | #define GUID_LEN 36 | |
5ee9c198 | 105 | |
ec0971ba | 106 | static bool efivars_pstore_disable = |
ca0ba26f | 107 | IS_ENABLED(CONFIG_EFI_VARS_PSTORE_DEFAULT_DISABLE); |
ec0971ba SF |
108 | |
109 | module_param_named(pstore_disable, efivars_pstore_disable, bool, 0644); | |
110 | ||
1da177e4 LT |
111 | /* |
112 | * The maximum size of VariableName + Data = 1024 | |
113 | * Therefore, it's reasonable to save that much | |
114 | * space in each part of the structure, | |
115 | * and we use a page for reading/writing. | |
116 | */ | |
117 | ||
118 | struct efi_variable { | |
119 | efi_char16_t VariableName[1024/sizeof(efi_char16_t)]; | |
120 | efi_guid_t VendorGuid; | |
121 | unsigned long DataSize; | |
122 | __u8 Data[1024]; | |
123 | efi_status_t Status; | |
124 | __u32 Attributes; | |
125 | } __attribute__((packed)); | |
126 | ||
1da177e4 | 127 | struct efivar_entry { |
4142ef14 | 128 | struct efivars *efivars; |
1da177e4 LT |
129 | struct efi_variable var; |
130 | struct list_head list; | |
131 | struct kobject kobj; | |
132 | }; | |
133 | ||
1da177e4 LT |
134 | struct efivar_attribute { |
135 | struct attribute attr; | |
136 | ssize_t (*show) (struct efivar_entry *entry, char *buf); | |
137 | ssize_t (*store)(struct efivar_entry *entry, const char *buf, size_t count); | |
138 | }; | |
139 | ||
5d9db883 MG |
140 | static struct efivars __efivars; |
141 | static struct efivar_operations ops; | |
142 | ||
7644c16c MW |
143 | #define PSTORE_EFI_ATTRIBUTES \ |
144 | (EFI_VARIABLE_NON_VOLATILE | \ | |
145 | EFI_VARIABLE_BOOTSERVICE_ACCESS | \ | |
146 | EFI_VARIABLE_RUNTIME_ACCESS) | |
1da177e4 | 147 | |
1da177e4 LT |
148 | #define EFIVAR_ATTR(_name, _mode, _show, _store) \ |
149 | struct efivar_attribute efivar_attr_##_name = { \ | |
7b595756 | 150 | .attr = {.name = __stringify(_name), .mode = _mode}, \ |
1da177e4 LT |
151 | .show = _show, \ |
152 | .store = _store, \ | |
153 | }; | |
154 | ||
1da177e4 LT |
155 | #define to_efivar_attr(_attr) container_of(_attr, struct efivar_attribute, attr) |
156 | #define to_efivar_entry(obj) container_of(obj, struct efivar_entry, kobj) | |
157 | ||
158 | /* | |
159 | * Prototype for sysfs creation function | |
160 | */ | |
161 | static int | |
4142ef14 MW |
162 | efivar_create_sysfs_entry(struct efivars *efivars, |
163 | unsigned long variable_name_size, | |
164 | efi_char16_t *variable_name, | |
165 | efi_guid_t *vendor_guid); | |
1da177e4 | 166 | |
a93bc0c6 SA |
167 | /* |
168 | * Prototype for workqueue functions updating sysfs entry | |
169 | */ | |
170 | ||
171 | static void efivar_update_sysfs_entries(struct work_struct *); | |
172 | static DECLARE_WORK(efivar_work, efivar_update_sysfs_entries); | |
e971318b | 173 | static bool efivar_wq_enabled = true; |
a93bc0c6 | 174 | |
1da177e4 LT |
175 | /* |
176 | * Return the number of bytes is the length of this string | |
177 | * Note: this is NOT the same as the number of unicode characters | |
178 | */ | |
179 | static inline unsigned long | |
a2940908 | 180 | utf16_strsize(efi_char16_t *data, unsigned long maxlength) |
1da177e4 | 181 | { |
a2940908 | 182 | return utf16_strnlen(data, maxlength/sizeof(efi_char16_t)) * sizeof(efi_char16_t); |
1da177e4 LT |
183 | } |
184 | ||
828aa1f0 MW |
185 | static inline int |
186 | utf16_strncmp(const efi_char16_t *a, const efi_char16_t *b, size_t len) | |
187 | { | |
188 | while (1) { | |
189 | if (len == 0) | |
190 | return 0; | |
191 | if (*a < *b) | |
192 | return -1; | |
193 | if (*a > *b) | |
194 | return 1; | |
195 | if (*a == 0) /* implies *b == 0 */ | |
196 | return 0; | |
197 | a++; | |
198 | b++; | |
199 | len--; | |
200 | } | |
201 | } | |
202 | ||
fec6c20b | 203 | static bool |
54b3a4d3 MG |
204 | validate_device_path(struct efi_variable *var, int match, u8 *buffer, |
205 | unsigned long len) | |
fec6c20b MG |
206 | { |
207 | struct efi_generic_dev_path *node; | |
208 | int offset = 0; | |
209 | ||
210 | node = (struct efi_generic_dev_path *)buffer; | |
211 | ||
54b3a4d3 MG |
212 | if (len < sizeof(*node)) |
213 | return false; | |
fec6c20b | 214 | |
54b3a4d3 MG |
215 | while (offset <= len - sizeof(*node) && |
216 | node->length >= sizeof(*node) && | |
217 | node->length <= len - offset) { | |
218 | offset += node->length; | |
fec6c20b MG |
219 | |
220 | if ((node->type == EFI_DEV_END_PATH || | |
221 | node->type == EFI_DEV_END_PATH2) && | |
222 | node->sub_type == EFI_DEV_END_ENTIRE) | |
223 | return true; | |
224 | ||
225 | node = (struct efi_generic_dev_path *)(buffer + offset); | |
226 | } | |
227 | ||
228 | /* | |
229 | * If we're here then either node->length pointed past the end | |
230 | * of the buffer or we reached the end of the buffer without | |
231 | * finding a device path end node. | |
232 | */ | |
233 | return false; | |
234 | } | |
235 | ||
236 | static bool | |
54b3a4d3 MG |
237 | validate_boot_order(struct efi_variable *var, int match, u8 *buffer, |
238 | unsigned long len) | |
fec6c20b MG |
239 | { |
240 | /* An array of 16-bit integers */ | |
241 | if ((len % 2) != 0) | |
242 | return false; | |
243 | ||
244 | return true; | |
245 | } | |
246 | ||
247 | static bool | |
54b3a4d3 MG |
248 | validate_load_option(struct efi_variable *var, int match, u8 *buffer, |
249 | unsigned long len) | |
fec6c20b MG |
250 | { |
251 | u16 filepathlength; | |
54b3a4d3 MG |
252 | int i, desclength = 0, namelen; |
253 | ||
254 | namelen = utf16_strnlen(var->VariableName, sizeof(var->VariableName)); | |
fec6c20b MG |
255 | |
256 | /* Either "Boot" or "Driver" followed by four digits of hex */ | |
257 | for (i = match; i < match+4; i++) { | |
54b3a4d3 MG |
258 | if (var->VariableName[i] > 127 || |
259 | hex_to_bin(var->VariableName[i] & 0xff) < 0) | |
fec6c20b MG |
260 | return true; |
261 | } | |
262 | ||
54b3a4d3 MG |
263 | /* Reject it if there's 4 digits of hex and then further content */ |
264 | if (namelen > match + 4) | |
265 | return false; | |
266 | ||
267 | /* A valid entry must be at least 8 bytes */ | |
268 | if (len < 8) | |
fec6c20b MG |
269 | return false; |
270 | ||
271 | filepathlength = buffer[4] | buffer[5] << 8; | |
272 | ||
273 | /* | |
274 | * There's no stored length for the description, so it has to be | |
275 | * found by hand | |
276 | */ | |
54b3a4d3 | 277 | desclength = utf16_strsize((efi_char16_t *)(buffer + 6), len - 6) + 2; |
fec6c20b MG |
278 | |
279 | /* Each boot entry must have a descriptor */ | |
280 | if (!desclength) | |
281 | return false; | |
282 | ||
283 | /* | |
284 | * If the sum of the length of the description, the claimed filepath | |
285 | * length and the original header are greater than the length of the | |
286 | * variable, it's malformed | |
287 | */ | |
288 | if ((desclength + filepathlength + 6) > len) | |
289 | return false; | |
290 | ||
291 | /* | |
292 | * And, finally, check the filepath | |
293 | */ | |
294 | return validate_device_path(var, match, buffer + desclength + 6, | |
295 | filepathlength); | |
296 | } | |
297 | ||
298 | static bool | |
54b3a4d3 MG |
299 | validate_uint16(struct efi_variable *var, int match, u8 *buffer, |
300 | unsigned long len) | |
fec6c20b MG |
301 | { |
302 | /* A single 16-bit integer */ | |
303 | if (len != 2) | |
304 | return false; | |
305 | ||
306 | return true; | |
307 | } | |
308 | ||
309 | static bool | |
54b3a4d3 MG |
310 | validate_ascii_string(struct efi_variable *var, int match, u8 *buffer, |
311 | unsigned long len) | |
fec6c20b MG |
312 | { |
313 | int i; | |
314 | ||
315 | for (i = 0; i < len; i++) { | |
316 | if (buffer[i] > 127) | |
317 | return false; | |
318 | ||
319 | if (buffer[i] == 0) | |
320 | return true; | |
321 | } | |
322 | ||
323 | return false; | |
324 | } | |
325 | ||
326 | struct variable_validate { | |
327 | char *name; | |
328 | bool (*validate)(struct efi_variable *var, int match, u8 *data, | |
54b3a4d3 | 329 | unsigned long len); |
fec6c20b MG |
330 | }; |
331 | ||
332 | static const struct variable_validate variable_validate[] = { | |
333 | { "BootNext", validate_uint16 }, | |
334 | { "BootOrder", validate_boot_order }, | |
335 | { "DriverOrder", validate_boot_order }, | |
336 | { "Boot*", validate_load_option }, | |
337 | { "Driver*", validate_load_option }, | |
338 | { "ConIn", validate_device_path }, | |
339 | { "ConInDev", validate_device_path }, | |
340 | { "ConOut", validate_device_path }, | |
341 | { "ConOutDev", validate_device_path }, | |
342 | { "ErrOut", validate_device_path }, | |
343 | { "ErrOutDev", validate_device_path }, | |
344 | { "Timeout", validate_uint16 }, | |
345 | { "Lang", validate_ascii_string }, | |
346 | { "PlatformLang", validate_ascii_string }, | |
347 | { "", NULL }, | |
348 | }; | |
349 | ||
350 | static bool | |
54b3a4d3 | 351 | validate_var(struct efi_variable *var, u8 *data, unsigned long len) |
fec6c20b MG |
352 | { |
353 | int i; | |
354 | u16 *unicode_name = var->VariableName; | |
355 | ||
356 | for (i = 0; variable_validate[i].validate != NULL; i++) { | |
357 | const char *name = variable_validate[i].name; | |
358 | int match; | |
359 | ||
360 | for (match = 0; ; match++) { | |
361 | char c = name[match]; | |
362 | u16 u = unicode_name[match]; | |
363 | ||
364 | /* All special variables are plain ascii */ | |
365 | if (u > 127) | |
366 | return true; | |
367 | ||
368 | /* Wildcard in the matching name means we've matched */ | |
369 | if (c == '*') | |
370 | return variable_validate[i].validate(var, | |
371 | match, data, len); | |
372 | ||
373 | /* Case sensitive match */ | |
374 | if (c != u) | |
375 | break; | |
376 | ||
377 | /* Reached the end of the string while matching */ | |
378 | if (!c) | |
379 | return variable_validate[i].validate(var, | |
380 | match, data, len); | |
381 | } | |
382 | } | |
383 | ||
384 | return true; | |
385 | } | |
386 | ||
1da177e4 | 387 | static efi_status_t |
5ee9c198 | 388 | get_var_data_locked(struct efivars *efivars, struct efi_variable *var) |
1da177e4 LT |
389 | { |
390 | efi_status_t status; | |
391 | ||
1da177e4 | 392 | var->DataSize = 1024; |
3295814d MW |
393 | status = efivars->ops->get_variable(var->VariableName, |
394 | &var->VendorGuid, | |
395 | &var->Attributes, | |
396 | &var->DataSize, | |
397 | var->Data); | |
5ee9c198 MG |
398 | return status; |
399 | } | |
400 | ||
401 | static efi_status_t | |
402 | get_var_data(struct efivars *efivars, struct efi_variable *var) | |
403 | { | |
404 | efi_status_t status; | |
81fa4e58 | 405 | unsigned long flags; |
5ee9c198 | 406 | |
81fa4e58 | 407 | spin_lock_irqsave(&efivars->lock, flags); |
5ee9c198 | 408 | status = get_var_data_locked(efivars, var); |
81fa4e58 | 409 | spin_unlock_irqrestore(&efivars->lock, flags); |
5ee9c198 | 410 | |
1da177e4 LT |
411 | if (status != EFI_SUCCESS) { |
412 | printk(KERN_WARNING "efivars: get_variable() failed 0x%lx!\n", | |
413 | status); | |
414 | } | |
415 | return status; | |
416 | } | |
417 | ||
68d92986 MG |
418 | static efi_status_t |
419 | check_var_size_locked(struct efivars *efivars, u32 attributes, | |
420 | unsigned long size) | |
421 | { | |
422 | u64 storage_size, remaining_size, max_size; | |
423 | efi_status_t status; | |
424 | const struct efivar_operations *fops = efivars->ops; | |
425 | ||
426 | if (!efivars->ops->query_variable_info) | |
427 | return EFI_UNSUPPORTED; | |
428 | ||
429 | status = fops->query_variable_info(attributes, &storage_size, | |
430 | &remaining_size, &max_size); | |
431 | ||
432 | if (status != EFI_SUCCESS) | |
433 | return status; | |
434 | ||
435 | if (!storage_size || size > remaining_size || size > max_size || | |
436 | (remaining_size - size) < (storage_size / 2)) | |
437 | return EFI_OUT_OF_RESOURCES; | |
438 | ||
439 | return status; | |
440 | } | |
441 | ||
442 | ||
443 | static efi_status_t | |
444 | check_var_size(struct efivars *efivars, u32 attributes, unsigned long size) | |
445 | { | |
446 | efi_status_t status; | |
447 | unsigned long flags; | |
448 | ||
449 | spin_lock_irqsave(&efivars->lock, flags); | |
450 | status = check_var_size_locked(efivars, attributes, size); | |
451 | spin_unlock_irqrestore(&efivars->lock, flags); | |
452 | ||
453 | return status; | |
454 | } | |
455 | ||
1da177e4 LT |
456 | static ssize_t |
457 | efivar_guid_read(struct efivar_entry *entry, char *buf) | |
458 | { | |
459 | struct efi_variable *var = &entry->var; | |
460 | char *str = buf; | |
461 | ||
462 | if (!entry || !buf) | |
463 | return 0; | |
464 | ||
465 | efi_guid_unparse(&var->VendorGuid, str); | |
466 | str += strlen(str); | |
467 | str += sprintf(str, "\n"); | |
468 | ||
469 | return str - buf; | |
470 | } | |
471 | ||
472 | static ssize_t | |
473 | efivar_attr_read(struct efivar_entry *entry, char *buf) | |
474 | { | |
475 | struct efi_variable *var = &entry->var; | |
476 | char *str = buf; | |
477 | efi_status_t status; | |
478 | ||
479 | if (!entry || !buf) | |
480 | return -EINVAL; | |
481 | ||
4142ef14 | 482 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
483 | if (status != EFI_SUCCESS) |
484 | return -EIO; | |
485 | ||
70839090 | 486 | if (var->Attributes & EFI_VARIABLE_NON_VOLATILE) |
1da177e4 | 487 | str += sprintf(str, "EFI_VARIABLE_NON_VOLATILE\n"); |
70839090 | 488 | if (var->Attributes & EFI_VARIABLE_BOOTSERVICE_ACCESS) |
1da177e4 | 489 | str += sprintf(str, "EFI_VARIABLE_BOOTSERVICE_ACCESS\n"); |
70839090 | 490 | if (var->Attributes & EFI_VARIABLE_RUNTIME_ACCESS) |
1da177e4 | 491 | str += sprintf(str, "EFI_VARIABLE_RUNTIME_ACCESS\n"); |
70839090 KA |
492 | if (var->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) |
493 | str += sprintf(str, "EFI_VARIABLE_HARDWARE_ERROR_RECORD\n"); | |
494 | if (var->Attributes & EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS) | |
495 | str += sprintf(str, | |
496 | "EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS\n"); | |
497 | if (var->Attributes & | |
498 | EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS) | |
499 | str += sprintf(str, | |
500 | "EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS\n"); | |
501 | if (var->Attributes & EFI_VARIABLE_APPEND_WRITE) | |
502 | str += sprintf(str, "EFI_VARIABLE_APPEND_WRITE\n"); | |
1da177e4 LT |
503 | return str - buf; |
504 | } | |
505 | ||
506 | static ssize_t | |
507 | efivar_size_read(struct efivar_entry *entry, char *buf) | |
508 | { | |
509 | struct efi_variable *var = &entry->var; | |
510 | char *str = buf; | |
511 | efi_status_t status; | |
512 | ||
513 | if (!entry || !buf) | |
514 | return -EINVAL; | |
515 | ||
4142ef14 | 516 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
517 | if (status != EFI_SUCCESS) |
518 | return -EIO; | |
519 | ||
520 | str += sprintf(str, "0x%lx\n", var->DataSize); | |
521 | return str - buf; | |
522 | } | |
523 | ||
524 | static ssize_t | |
525 | efivar_data_read(struct efivar_entry *entry, char *buf) | |
526 | { | |
527 | struct efi_variable *var = &entry->var; | |
528 | efi_status_t status; | |
529 | ||
530 | if (!entry || !buf) | |
531 | return -EINVAL; | |
532 | ||
4142ef14 | 533 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
534 | if (status != EFI_SUCCESS) |
535 | return -EIO; | |
536 | ||
537 | memcpy(buf, var->Data, var->DataSize); | |
538 | return var->DataSize; | |
539 | } | |
540 | /* | |
541 | * We allow each variable to be edited via rewriting the | |
542 | * entire efi variable structure. | |
543 | */ | |
544 | static ssize_t | |
545 | efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count) | |
546 | { | |
547 | struct efi_variable *new_var, *var = &entry->var; | |
4142ef14 | 548 | struct efivars *efivars = entry->efivars; |
1da177e4 LT |
549 | efi_status_t status = EFI_NOT_FOUND; |
550 | ||
551 | if (count != sizeof(struct efi_variable)) | |
552 | return -EINVAL; | |
553 | ||
554 | new_var = (struct efi_variable *)buf; | |
555 | /* | |
556 | * If only updating the variable data, then the name | |
557 | * and guid should remain the same | |
558 | */ | |
559 | if (memcmp(new_var->VariableName, var->VariableName, sizeof(var->VariableName)) || | |
560 | efi_guidcmp(new_var->VendorGuid, var->VendorGuid)) { | |
561 | printk(KERN_ERR "efivars: Cannot edit the wrong variable!\n"); | |
562 | return -EINVAL; | |
563 | } | |
564 | ||
565 | if ((new_var->DataSize <= 0) || (new_var->Attributes == 0)){ | |
566 | printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n"); | |
567 | return -EINVAL; | |
568 | } | |
569 | ||
fec6c20b MG |
570 | if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 || |
571 | validate_var(new_var, new_var->Data, new_var->DataSize) == false) { | |
572 | printk(KERN_ERR "efivars: Malformed variable content\n"); | |
573 | return -EINVAL; | |
574 | } | |
575 | ||
81fa4e58 | 576 | spin_lock_irq(&efivars->lock); |
68d92986 MG |
577 | |
578 | status = check_var_size_locked(efivars, new_var->Attributes, | |
579 | new_var->DataSize + utf16_strsize(new_var->VariableName, 1024)); | |
580 | ||
581 | if (status == EFI_SUCCESS || status == EFI_UNSUPPORTED) | |
582 | status = efivars->ops->set_variable(new_var->VariableName, | |
583 | &new_var->VendorGuid, | |
584 | new_var->Attributes, | |
585 | new_var->DataSize, | |
586 | new_var->Data); | |
1da177e4 | 587 | |
81fa4e58 | 588 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
589 | |
590 | if (status != EFI_SUCCESS) { | |
591 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
592 | status); | |
593 | return -EIO; | |
594 | } | |
595 | ||
596 | memcpy(&entry->var, new_var, count); | |
597 | return count; | |
598 | } | |
599 | ||
600 | static ssize_t | |
601 | efivar_show_raw(struct efivar_entry *entry, char *buf) | |
602 | { | |
603 | struct efi_variable *var = &entry->var; | |
604 | efi_status_t status; | |
605 | ||
606 | if (!entry || !buf) | |
607 | return 0; | |
608 | ||
4142ef14 | 609 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
610 | if (status != EFI_SUCCESS) |
611 | return -EIO; | |
612 | ||
613 | memcpy(buf, var, sizeof(*var)); | |
614 | return sizeof(*var); | |
615 | } | |
616 | ||
617 | /* | |
618 | * Generic read/write functions that call the specific functions of | |
70f23fd6 | 619 | * the attributes... |
1da177e4 LT |
620 | */ |
621 | static ssize_t efivar_attr_show(struct kobject *kobj, struct attribute *attr, | |
622 | char *buf) | |
623 | { | |
624 | struct efivar_entry *var = to_efivar_entry(kobj); | |
625 | struct efivar_attribute *efivar_attr = to_efivar_attr(attr); | |
70f2817a | 626 | ssize_t ret = -EIO; |
1da177e4 LT |
627 | |
628 | if (!capable(CAP_SYS_ADMIN)) | |
629 | return -EACCES; | |
630 | ||
631 | if (efivar_attr->show) { | |
632 | ret = efivar_attr->show(var, buf); | |
633 | } | |
634 | return ret; | |
635 | } | |
636 | ||
637 | static ssize_t efivar_attr_store(struct kobject *kobj, struct attribute *attr, | |
638 | const char *buf, size_t count) | |
639 | { | |
640 | struct efivar_entry *var = to_efivar_entry(kobj); | |
641 | struct efivar_attribute *efivar_attr = to_efivar_attr(attr); | |
70f2817a | 642 | ssize_t ret = -EIO; |
1da177e4 LT |
643 | |
644 | if (!capable(CAP_SYS_ADMIN)) | |
645 | return -EACCES; | |
646 | ||
647 | if (efivar_attr->store) | |
648 | ret = efivar_attr->store(var, buf, count); | |
649 | ||
650 | return ret; | |
651 | } | |
652 | ||
52cf25d0 | 653 | static const struct sysfs_ops efivar_attr_ops = { |
1da177e4 LT |
654 | .show = efivar_attr_show, |
655 | .store = efivar_attr_store, | |
656 | }; | |
657 | ||
658 | static void efivar_release(struct kobject *kobj) | |
659 | { | |
660 | struct efivar_entry *var = container_of(kobj, struct efivar_entry, kobj); | |
1da177e4 LT |
661 | kfree(var); |
662 | } | |
663 | ||
664 | static EFIVAR_ATTR(guid, 0400, efivar_guid_read, NULL); | |
665 | static EFIVAR_ATTR(attributes, 0400, efivar_attr_read, NULL); | |
666 | static EFIVAR_ATTR(size, 0400, efivar_size_read, NULL); | |
667 | static EFIVAR_ATTR(data, 0400, efivar_data_read, NULL); | |
668 | static EFIVAR_ATTR(raw_var, 0600, efivar_show_raw, efivar_store_raw); | |
669 | ||
670 | static struct attribute *def_attrs[] = { | |
671 | &efivar_attr_guid.attr, | |
672 | &efivar_attr_size.attr, | |
673 | &efivar_attr_attributes.attr, | |
674 | &efivar_attr_data.attr, | |
675 | &efivar_attr_raw_var.attr, | |
676 | NULL, | |
677 | }; | |
678 | ||
e89a4116 | 679 | static struct kobj_type efivar_ktype = { |
1da177e4 LT |
680 | .release = efivar_release, |
681 | .sysfs_ops = &efivar_attr_ops, | |
682 | .default_attrs = def_attrs, | |
683 | }; | |
684 | ||
1da177e4 LT |
685 | static inline void |
686 | efivar_unregister(struct efivar_entry *var) | |
687 | { | |
c10997f6 | 688 | kobject_put(&var->kobj); |
1da177e4 LT |
689 | } |
690 | ||
5d9db883 MG |
691 | static int efivarfs_file_open(struct inode *inode, struct file *file) |
692 | { | |
693 | file->private_data = inode->i_private; | |
694 | return 0; | |
695 | } | |
696 | ||
7253eaba MF |
697 | static int efi_status_to_err(efi_status_t status) |
698 | { | |
699 | int err; | |
700 | ||
701 | switch (status) { | |
702 | case EFI_INVALID_PARAMETER: | |
703 | err = -EINVAL; | |
704 | break; | |
705 | case EFI_OUT_OF_RESOURCES: | |
706 | err = -ENOSPC; | |
707 | break; | |
708 | case EFI_DEVICE_ERROR: | |
709 | err = -EIO; | |
710 | break; | |
711 | case EFI_WRITE_PROTECTED: | |
712 | err = -EROFS; | |
713 | break; | |
714 | case EFI_SECURITY_VIOLATION: | |
715 | err = -EACCES; | |
716 | break; | |
717 | case EFI_NOT_FOUND: | |
1fa7e695 | 718 | err = -EIO; |
7253eaba MF |
719 | break; |
720 | default: | |
721 | err = -EINVAL; | |
722 | } | |
723 | ||
724 | return err; | |
725 | } | |
726 | ||
5d9db883 MG |
727 | static ssize_t efivarfs_file_write(struct file *file, |
728 | const char __user *userbuf, size_t count, loff_t *ppos) | |
729 | { | |
730 | struct efivar_entry *var = file->private_data; | |
731 | struct efivars *efivars; | |
732 | efi_status_t status; | |
733 | void *data; | |
734 | u32 attributes; | |
735 | struct inode *inode = file->f_mapping->host; | |
07b1c5bc | 736 | unsigned long datasize = count - sizeof(attributes); |
68d92986 | 737 | unsigned long newdatasize, varsize; |
cfcf2f11 | 738 | ssize_t bytes = 0; |
5d9db883 MG |
739 | |
740 | if (count < sizeof(attributes)) | |
741 | return -EINVAL; | |
742 | ||
89d16665 MF |
743 | if (copy_from_user(&attributes, userbuf, sizeof(attributes))) |
744 | return -EFAULT; | |
5d9db883 | 745 | |
89d16665 MF |
746 | if (attributes & ~(EFI_VARIABLE_MASK)) |
747 | return -EINVAL; | |
5d9db883 MG |
748 | |
749 | efivars = var->efivars; | |
750 | ||
89d16665 MF |
751 | /* |
752 | * Ensure that the user can't allocate arbitrarily large | |
753 | * amounts of memory. Pick a default size of 64K if | |
754 | * QueryVariableInfo() isn't supported by the firmware. | |
755 | */ | |
89d16665 | 756 | |
68d92986 MG |
757 | varsize = datasize + utf16_strsize(var->var.VariableName, 1024); |
758 | status = check_var_size(efivars, attributes, varsize); | |
89d16665 MF |
759 | |
760 | if (status != EFI_SUCCESS) { | |
761 | if (status != EFI_UNSUPPORTED) | |
762 | return efi_status_to_err(status); | |
763 | ||
68d92986 MG |
764 | if (datasize > 65536) |
765 | return -ENOSPC; | |
5d9db883 MG |
766 | } |
767 | ||
89d16665 MF |
768 | data = kmalloc(datasize, GFP_KERNEL); |
769 | if (!data) | |
770 | return -ENOMEM; | |
771 | ||
5d9db883 | 772 | if (copy_from_user(data, userbuf + sizeof(attributes), datasize)) { |
cfcf2f11 | 773 | bytes = -EFAULT; |
5d9db883 MG |
774 | goto out; |
775 | } | |
776 | ||
777 | if (validate_var(&var->var, data, datasize) == false) { | |
cfcf2f11 | 778 | bytes = -EINVAL; |
5d9db883 MG |
779 | goto out; |
780 | } | |
781 | ||
f5f6a60a JK |
782 | /* |
783 | * The lock here protects the get_variable call, the conditional | |
784 | * set_variable call, and removal of the variable from the efivars | |
785 | * list (in the case of an authenticated delete). | |
786 | */ | |
81fa4e58 | 787 | spin_lock_irq(&efivars->lock); |
f5f6a60a | 788 | |
68d92986 MG |
789 | /* |
790 | * Ensure that the available space hasn't shrunk below the safe level | |
791 | */ | |
792 | ||
793 | status = check_var_size_locked(efivars, attributes, varsize); | |
794 | ||
795 | if (status != EFI_SUCCESS && status != EFI_UNSUPPORTED) { | |
796 | spin_unlock_irq(&efivars->lock); | |
797 | kfree(data); | |
798 | ||
799 | return efi_status_to_err(status); | |
800 | } | |
801 | ||
5d9db883 MG |
802 | status = efivars->ops->set_variable(var->var.VariableName, |
803 | &var->var.VendorGuid, | |
804 | attributes, datasize, | |
805 | data); | |
806 | ||
f5f6a60a | 807 | if (status != EFI_SUCCESS) { |
81fa4e58 | 808 | spin_unlock_irq(&efivars->lock); |
f5f6a60a JK |
809 | kfree(data); |
810 | ||
7253eaba | 811 | return efi_status_to_err(status); |
5d9db883 | 812 | } |
0c542edd | 813 | |
cfcf2f11 MF |
814 | bytes = count; |
815 | ||
0c542edd JK |
816 | /* |
817 | * Writing to the variable may have caused a change in size (which | |
818 | * could either be an append or an overwrite), or the variable to be | |
819 | * deleted. Perform a GetVariable() so we can tell what actually | |
820 | * happened. | |
821 | */ | |
822 | newdatasize = 0; | |
823 | status = efivars->ops->get_variable(var->var.VariableName, | |
824 | &var->var.VendorGuid, | |
825 | NULL, &newdatasize, | |
826 | NULL); | |
827 | ||
828 | if (status == EFI_BUFFER_TOO_SMALL) { | |
81fa4e58 | 829 | spin_unlock_irq(&efivars->lock); |
0c542edd JK |
830 | mutex_lock(&inode->i_mutex); |
831 | i_size_write(inode, newdatasize + sizeof(attributes)); | |
832 | mutex_unlock(&inode->i_mutex); | |
833 | ||
834 | } else if (status == EFI_NOT_FOUND) { | |
0c542edd | 835 | list_del(&var->list); |
81fa4e58 | 836 | spin_unlock_irq(&efivars->lock); |
0c542edd JK |
837 | efivar_unregister(var); |
838 | drop_nlink(inode); | |
791eb564 | 839 | d_delete(file->f_dentry); |
0c542edd JK |
840 | dput(file->f_dentry); |
841 | ||
842 | } else { | |
81fa4e58 | 843 | spin_unlock_irq(&efivars->lock); |
0c542edd JK |
844 | pr_warn("efivarfs: inconsistent EFI variable implementation? " |
845 | "status = %lx\n", status); | |
846 | } | |
847 | ||
5d9db883 MG |
848 | out: |
849 | kfree(data); | |
850 | ||
cfcf2f11 | 851 | return bytes; |
5d9db883 MG |
852 | } |
853 | ||
854 | static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf, | |
855 | size_t count, loff_t *ppos) | |
856 | { | |
857 | struct efivar_entry *var = file->private_data; | |
858 | struct efivars *efivars = var->efivars; | |
859 | efi_status_t status; | |
860 | unsigned long datasize = 0; | |
861 | u32 attributes; | |
862 | void *data; | |
d142df03 | 863 | ssize_t size = 0; |
5d9db883 | 864 | |
81fa4e58 | 865 | spin_lock_irq(&efivars->lock); |
5d9db883 MG |
866 | status = efivars->ops->get_variable(var->var.VariableName, |
867 | &var->var.VendorGuid, | |
868 | &attributes, &datasize, NULL); | |
81fa4e58 | 869 | spin_unlock_irq(&efivars->lock); |
5d9db883 MG |
870 | |
871 | if (status != EFI_BUFFER_TOO_SMALL) | |
7253eaba | 872 | return efi_status_to_err(status); |
5d9db883 | 873 | |
d2923841 | 874 | data = kmalloc(datasize + sizeof(attributes), GFP_KERNEL); |
5d9db883 MG |
875 | |
876 | if (!data) | |
7253eaba | 877 | return -ENOMEM; |
5d9db883 | 878 | |
81fa4e58 | 879 | spin_lock_irq(&efivars->lock); |
5d9db883 MG |
880 | status = efivars->ops->get_variable(var->var.VariableName, |
881 | &var->var.VendorGuid, | |
882 | &attributes, &datasize, | |
d2923841 | 883 | (data + sizeof(attributes))); |
81fa4e58 | 884 | spin_unlock_irq(&efivars->lock); |
f5f6a60a | 885 | |
7253eaba MF |
886 | if (status != EFI_SUCCESS) { |
887 | size = efi_status_to_err(status); | |
d142df03 | 888 | goto out_free; |
7253eaba | 889 | } |
5d9db883 | 890 | |
d2923841 | 891 | memcpy(data, &attributes, sizeof(attributes)); |
5d9db883 | 892 | size = simple_read_from_buffer(userbuf, count, ppos, |
d2923841 | 893 | data, datasize + sizeof(attributes)); |
d142df03 | 894 | out_free: |
5d9db883 MG |
895 | kfree(data); |
896 | ||
897 | return size; | |
898 | } | |
899 | ||
900 | static void efivarfs_evict_inode(struct inode *inode) | |
901 | { | |
902 | clear_inode(inode); | |
903 | } | |
904 | ||
905 | static const struct super_operations efivarfs_ops = { | |
906 | .statfs = simple_statfs, | |
907 | .drop_inode = generic_delete_inode, | |
908 | .evict_inode = efivarfs_evict_inode, | |
909 | .show_options = generic_show_options, | |
910 | }; | |
911 | ||
912 | static struct super_block *efivarfs_sb; | |
913 | ||
914 | static const struct inode_operations efivarfs_dir_inode_operations; | |
915 | ||
916 | static const struct file_operations efivarfs_file_operations = { | |
917 | .open = efivarfs_file_open, | |
918 | .read = efivarfs_file_read, | |
919 | .write = efivarfs_file_write, | |
920 | .llseek = no_llseek, | |
921 | }; | |
922 | ||
923 | static struct inode *efivarfs_get_inode(struct super_block *sb, | |
924 | const struct inode *dir, int mode, dev_t dev) | |
925 | { | |
926 | struct inode *inode = new_inode(sb); | |
927 | ||
928 | if (inode) { | |
929 | inode->i_ino = get_next_ino(); | |
5d9db883 MG |
930 | inode->i_mode = mode; |
931 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
932 | switch (mode & S_IFMT) { | |
933 | case S_IFREG: | |
934 | inode->i_fop = &efivarfs_file_operations; | |
935 | break; | |
936 | case S_IFDIR: | |
937 | inode->i_op = &efivarfs_dir_inode_operations; | |
938 | inode->i_fop = &simple_dir_operations; | |
939 | inc_nlink(inode); | |
940 | break; | |
941 | } | |
942 | } | |
943 | return inode; | |
944 | } | |
945 | ||
47f531e8 MF |
946 | /* |
947 | * Return true if 'str' is a valid efivarfs filename of the form, | |
948 | * | |
949 | * VariableName-12345678-1234-1234-1234-1234567891bc | |
950 | */ | |
951 | static bool efivarfs_valid_name(const char *str, int len) | |
952 | { | |
953 | static const char dashes[GUID_LEN] = { | |
954 | [8] = 1, [13] = 1, [18] = 1, [23] = 1 | |
955 | }; | |
956 | const char *s = str + len - GUID_LEN; | |
957 | int i; | |
958 | ||
959 | /* | |
960 | * We need a GUID, plus at least one letter for the variable name, | |
961 | * plus the '-' separator | |
962 | */ | |
963 | if (len < GUID_LEN + 2) | |
964 | return false; | |
965 | ||
123abd76 MF |
966 | /* GUID must be preceded by a '-' */ |
967 | if (*(s - 1) != '-') | |
47f531e8 MF |
968 | return false; |
969 | ||
970 | /* | |
971 | * Validate that 's' is of the correct format, e.g. | |
972 | * | |
973 | * 12345678-1234-1234-1234-123456789abc | |
974 | */ | |
975 | for (i = 0; i < GUID_LEN; i++) { | |
976 | if (dashes[i]) { | |
977 | if (*s++ != '-') | |
978 | return false; | |
979 | } else { | |
980 | if (!isxdigit(*s++)) | |
981 | return false; | |
982 | } | |
983 | } | |
984 | ||
985 | return true; | |
986 | } | |
987 | ||
5d9db883 MG |
988 | static void efivarfs_hex_to_guid(const char *str, efi_guid_t *guid) |
989 | { | |
990 | guid->b[0] = hex_to_bin(str[6]) << 4 | hex_to_bin(str[7]); | |
991 | guid->b[1] = hex_to_bin(str[4]) << 4 | hex_to_bin(str[5]); | |
992 | guid->b[2] = hex_to_bin(str[2]) << 4 | hex_to_bin(str[3]); | |
993 | guid->b[3] = hex_to_bin(str[0]) << 4 | hex_to_bin(str[1]); | |
994 | guid->b[4] = hex_to_bin(str[11]) << 4 | hex_to_bin(str[12]); | |
995 | guid->b[5] = hex_to_bin(str[9]) << 4 | hex_to_bin(str[10]); | |
996 | guid->b[6] = hex_to_bin(str[16]) << 4 | hex_to_bin(str[17]); | |
997 | guid->b[7] = hex_to_bin(str[14]) << 4 | hex_to_bin(str[15]); | |
998 | guid->b[8] = hex_to_bin(str[19]) << 4 | hex_to_bin(str[20]); | |
999 | guid->b[9] = hex_to_bin(str[21]) << 4 | hex_to_bin(str[22]); | |
1000 | guid->b[10] = hex_to_bin(str[24]) << 4 | hex_to_bin(str[25]); | |
1001 | guid->b[11] = hex_to_bin(str[26]) << 4 | hex_to_bin(str[27]); | |
1002 | guid->b[12] = hex_to_bin(str[28]) << 4 | hex_to_bin(str[29]); | |
1003 | guid->b[13] = hex_to_bin(str[30]) << 4 | hex_to_bin(str[31]); | |
1004 | guid->b[14] = hex_to_bin(str[32]) << 4 | hex_to_bin(str[33]); | |
1005 | guid->b[15] = hex_to_bin(str[34]) << 4 | hex_to_bin(str[35]); | |
1006 | } | |
1007 | ||
1008 | static int efivarfs_create(struct inode *dir, struct dentry *dentry, | |
1009 | umode_t mode, bool excl) | |
1010 | { | |
45a937a8 | 1011 | struct inode *inode; |
5d9db883 MG |
1012 | struct efivars *efivars = &__efivars; |
1013 | struct efivar_entry *var; | |
1014 | int namelen, i = 0, err = 0; | |
1015 | ||
47f531e8 | 1016 | if (!efivarfs_valid_name(dentry->d_name.name, dentry->d_name.len)) |
5d9db883 MG |
1017 | return -EINVAL; |
1018 | ||
45a937a8 | 1019 | inode = efivarfs_get_inode(dir->i_sb, dir, mode, 0); |
5d9db883 | 1020 | if (!inode) |
aeeaa8d4 | 1021 | return -ENOMEM; |
5d9db883 MG |
1022 | |
1023 | var = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL); | |
45a937a8 AW |
1024 | if (!var) { |
1025 | err = -ENOMEM; | |
1026 | goto out; | |
1027 | } | |
5d9db883 | 1028 | |
310ad754 JK |
1029 | /* length of the variable name itself: remove GUID and separator */ |
1030 | namelen = dentry->d_name.len - GUID_LEN - 1; | |
5d9db883 MG |
1031 | |
1032 | efivarfs_hex_to_guid(dentry->d_name.name + namelen + 1, | |
1033 | &var->var.VendorGuid); | |
1034 | ||
1035 | for (i = 0; i < namelen; i++) | |
1036 | var->var.VariableName[i] = dentry->d_name.name[i]; | |
1037 | ||
1038 | var->var.VariableName[i] = '\0'; | |
1039 | ||
1040 | inode->i_private = var; | |
1041 | var->efivars = efivars; | |
1042 | var->kobj.kset = efivars->kset; | |
1043 | ||
1044 | err = kobject_init_and_add(&var->kobj, &efivar_ktype, NULL, "%s", | |
1045 | dentry->d_name.name); | |
1046 | if (err) | |
1047 | goto out; | |
1048 | ||
1049 | kobject_uevent(&var->kobj, KOBJ_ADD); | |
81fa4e58 | 1050 | spin_lock_irq(&efivars->lock); |
5d9db883 | 1051 | list_add(&var->list, &efivars->list); |
81fa4e58 | 1052 | spin_unlock_irq(&efivars->lock); |
5d9db883 MG |
1053 | d_instantiate(dentry, inode); |
1054 | dget(dentry); | |
1055 | out: | |
45a937a8 | 1056 | if (err) { |
5d9db883 | 1057 | kfree(var); |
45a937a8 AW |
1058 | iput(inode); |
1059 | } | |
5d9db883 MG |
1060 | return err; |
1061 | } | |
1062 | ||
1063 | static int efivarfs_unlink(struct inode *dir, struct dentry *dentry) | |
1064 | { | |
1065 | struct efivar_entry *var = dentry->d_inode->i_private; | |
1066 | struct efivars *efivars = var->efivars; | |
1067 | efi_status_t status; | |
1068 | ||
81fa4e58 | 1069 | spin_lock_irq(&efivars->lock); |
5d9db883 MG |
1070 | |
1071 | status = efivars->ops->set_variable(var->var.VariableName, | |
1072 | &var->var.VendorGuid, | |
1073 | 0, 0, NULL); | |
1074 | ||
1075 | if (status == EFI_SUCCESS || status == EFI_NOT_FOUND) { | |
1076 | list_del(&var->list); | |
81fa4e58 | 1077 | spin_unlock_irq(&efivars->lock); |
5d9db883 | 1078 | efivar_unregister(var); |
de5fe955 | 1079 | drop_nlink(dentry->d_inode); |
5d9db883 MG |
1080 | dput(dentry); |
1081 | return 0; | |
1082 | } | |
1083 | ||
81fa4e58 | 1084 | spin_unlock_irq(&efivars->lock); |
5d9db883 MG |
1085 | return -EINVAL; |
1086 | }; | |
1087 | ||
da27a243 MF |
1088 | /* |
1089 | * Compare two efivarfs file names. | |
1090 | * | |
1091 | * An efivarfs filename is composed of two parts, | |
1092 | * | |
1093 | * 1. A case-sensitive variable name | |
1094 | * 2. A case-insensitive GUID | |
1095 | * | |
1096 | * So we need to perform a case-sensitive match on part 1 and a | |
1097 | * case-insensitive match on part 2. | |
1098 | */ | |
1099 | static int efivarfs_d_compare(const struct dentry *parent, const struct inode *pinode, | |
1100 | const struct dentry *dentry, const struct inode *inode, | |
1101 | unsigned int len, const char *str, | |
1102 | const struct qstr *name) | |
1103 | { | |
1104 | int guid = len - GUID_LEN; | |
1105 | ||
1106 | if (name->len != len) | |
1107 | return 1; | |
1108 | ||
1109 | /* Case-sensitive compare for the variable name */ | |
1110 | if (memcmp(str, name->name, guid)) | |
1111 | return 1; | |
1112 | ||
1113 | /* Case-insensitive compare for the GUID */ | |
1114 | return strncasecmp(name->name + guid, str + guid, GUID_LEN); | |
1115 | } | |
1116 | ||
1117 | static int efivarfs_d_hash(const struct dentry *dentry, | |
1118 | const struct inode *inode, struct qstr *qstr) | |
1119 | { | |
1120 | unsigned long hash = init_name_hash(); | |
1121 | const unsigned char *s = qstr->name; | |
1122 | unsigned int len = qstr->len; | |
1123 | ||
1124 | if (!efivarfs_valid_name(s, len)) | |
1125 | return -EINVAL; | |
1126 | ||
1127 | while (len-- > GUID_LEN) | |
1128 | hash = partial_name_hash(*s++, hash); | |
1129 | ||
1130 | /* GUID is case-insensitive. */ | |
1131 | while (len--) | |
1132 | hash = partial_name_hash(tolower(*s++), hash); | |
1133 | ||
1134 | qstr->hash = end_name_hash(hash); | |
1135 | return 0; | |
1136 | } | |
1137 | ||
1138 | /* | |
1139 | * Retaining negative dentries for an in-memory filesystem just wastes | |
1140 | * memory and lookup time: arrange for them to be deleted immediately. | |
1141 | */ | |
1142 | static int efivarfs_delete_dentry(const struct dentry *dentry) | |
1143 | { | |
1144 | return 1; | |
1145 | } | |
1146 | ||
1147 | static struct dentry_operations efivarfs_d_ops = { | |
1148 | .d_compare = efivarfs_d_compare, | |
1149 | .d_hash = efivarfs_d_hash, | |
1150 | .d_delete = efivarfs_delete_dentry, | |
1151 | }; | |
1152 | ||
1153 | static struct dentry *efivarfs_alloc_dentry(struct dentry *parent, char *name) | |
1154 | { | |
feff5dc4 | 1155 | struct dentry *d; |
da27a243 | 1156 | struct qstr q; |
feff5dc4 | 1157 | int err; |
da27a243 MF |
1158 | |
1159 | q.name = name; | |
1160 | q.len = strlen(name); | |
1161 | ||
feff5dc4 MF |
1162 | err = efivarfs_d_hash(NULL, NULL, &q); |
1163 | if (err) | |
1164 | return ERR_PTR(err); | |
1165 | ||
1166 | d = d_alloc(parent, &q); | |
1167 | if (d) | |
1168 | return d; | |
da27a243 | 1169 | |
feff5dc4 | 1170 | return ERR_PTR(-ENOMEM); |
da27a243 MF |
1171 | } |
1172 | ||
e83af1f1 | 1173 | static int efivarfs_fill_super(struct super_block *sb, void *data, int silent) |
5d9db883 MG |
1174 | { |
1175 | struct inode *inode = NULL; | |
1176 | struct dentry *root; | |
1177 | struct efivar_entry *entry, *n; | |
1178 | struct efivars *efivars = &__efivars; | |
5ba6e291 | 1179 | char *name; |
feff5dc4 | 1180 | int err = -ENOMEM; |
5d9db883 MG |
1181 | |
1182 | efivarfs_sb = sb; | |
1183 | ||
1184 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
1185 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
1186 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
91716322 | 1187 | sb->s_magic = EFIVARFS_MAGIC; |
5d9db883 | 1188 | sb->s_op = &efivarfs_ops; |
da27a243 | 1189 | sb->s_d_op = &efivarfs_d_ops; |
5d9db883 MG |
1190 | sb->s_time_gran = 1; |
1191 | ||
1192 | inode = efivarfs_get_inode(sb, NULL, S_IFDIR | 0755, 0); | |
5c9b50ab AW |
1193 | if (!inode) |
1194 | return -ENOMEM; | |
5d9db883 MG |
1195 | inode->i_op = &efivarfs_dir_inode_operations; |
1196 | ||
1197 | root = d_make_root(inode); | |
1198 | sb->s_root = root; | |
5c9b50ab AW |
1199 | if (!root) |
1200 | return -ENOMEM; | |
5d9db883 MG |
1201 | |
1202 | list_for_each_entry_safe(entry, n, &efivars->list, list) { | |
5d9db883 | 1203 | struct dentry *dentry, *root = efivarfs_sb->s_root; |
5d9db883 MG |
1204 | unsigned long size = 0; |
1205 | int len, i; | |
1206 | ||
5ba6e291 AW |
1207 | inode = NULL; |
1208 | ||
5d9db883 MG |
1209 | len = utf16_strlen(entry->var.VariableName); |
1210 | ||
310ad754 JK |
1211 | /* name, plus '-', plus GUID, plus NUL*/ |
1212 | name = kmalloc(len + 1 + GUID_LEN + 1, GFP_ATOMIC); | |
5ba6e291 AW |
1213 | if (!name) |
1214 | goto fail; | |
5d9db883 MG |
1215 | |
1216 | for (i = 0; i < len; i++) | |
1217 | name[i] = entry->var.VariableName[i] & 0xFF; | |
1218 | ||
1219 | name[len] = '-'; | |
1220 | ||
1221 | efi_guid_unparse(&entry->var.VendorGuid, name + len + 1); | |
1222 | ||
310ad754 | 1223 | name[len+GUID_LEN+1] = '\0'; |
5d9db883 MG |
1224 | |
1225 | inode = efivarfs_get_inode(efivarfs_sb, root->d_inode, | |
1226 | S_IFREG | 0644, 0); | |
5ba6e291 AW |
1227 | if (!inode) |
1228 | goto fail_name; | |
1229 | ||
da27a243 | 1230 | dentry = efivarfs_alloc_dentry(root, name); |
feff5dc4 MF |
1231 | if (IS_ERR(dentry)) { |
1232 | err = PTR_ERR(dentry); | |
5ba6e291 | 1233 | goto fail_inode; |
feff5dc4 | 1234 | } |
5ba6e291 | 1235 | |
c0359db1 AW |
1236 | /* copied by the above to local storage in the dentry. */ |
1237 | kfree(name); | |
5d9db883 | 1238 | |
81fa4e58 | 1239 | spin_lock_irq(&efivars->lock); |
5d9db883 MG |
1240 | efivars->ops->get_variable(entry->var.VariableName, |
1241 | &entry->var.VendorGuid, | |
1242 | &entry->var.Attributes, | |
1243 | &size, | |
1244 | NULL); | |
81fa4e58 | 1245 | spin_unlock_irq(&efivars->lock); |
5d9db883 MG |
1246 | |
1247 | mutex_lock(&inode->i_mutex); | |
1248 | inode->i_private = entry; | |
94a193fb | 1249 | i_size_write(inode, size + sizeof(entry->var.Attributes)); |
5d9db883 MG |
1250 | mutex_unlock(&inode->i_mutex); |
1251 | d_add(dentry, inode); | |
1252 | } | |
1253 | ||
1254 | return 0; | |
5ba6e291 AW |
1255 | |
1256 | fail_inode: | |
1257 | iput(inode); | |
1258 | fail_name: | |
1259 | kfree(name); | |
1260 | fail: | |
feff5dc4 | 1261 | return err; |
5d9db883 MG |
1262 | } |
1263 | ||
1264 | static struct dentry *efivarfs_mount(struct file_system_type *fs_type, | |
1265 | int flags, const char *dev_name, void *data) | |
1266 | { | |
1267 | return mount_single(fs_type, flags, data, efivarfs_fill_super); | |
1268 | } | |
1269 | ||
1270 | static void efivarfs_kill_sb(struct super_block *sb) | |
1271 | { | |
1272 | kill_litter_super(sb); | |
1273 | efivarfs_sb = NULL; | |
1274 | } | |
1275 | ||
1276 | static struct file_system_type efivarfs_type = { | |
1277 | .name = "efivarfs", | |
1278 | .mount = efivarfs_mount, | |
1279 | .kill_sb = efivarfs_kill_sb, | |
1280 | }; | |
7f78e035 | 1281 | MODULE_ALIAS_FS("efivarfs"); |
5d9db883 | 1282 | |
da27a243 MF |
1283 | /* |
1284 | * Handle negative dentry. | |
1285 | */ | |
1286 | static struct dentry *efivarfs_lookup(struct inode *dir, struct dentry *dentry, | |
1287 | unsigned int flags) | |
1288 | { | |
1289 | if (dentry->d_name.len > NAME_MAX) | |
1290 | return ERR_PTR(-ENAMETOOLONG); | |
1291 | d_add(dentry, NULL); | |
1292 | return NULL; | |
1293 | } | |
1294 | ||
5d9db883 | 1295 | static const struct inode_operations efivarfs_dir_inode_operations = { |
da27a243 | 1296 | .lookup = efivarfs_lookup, |
5d9db883 MG |
1297 | .unlink = efivarfs_unlink, |
1298 | .create = efivarfs_create, | |
1299 | }; | |
1300 | ||
ed9dc8ce | 1301 | #ifdef CONFIG_EFI_VARS_PSTORE |
5ee9c198 MG |
1302 | |
1303 | static int efi_pstore_open(struct pstore_info *psi) | |
1304 | { | |
1305 | struct efivars *efivars = psi->data; | |
1306 | ||
81fa4e58 | 1307 | spin_lock_irq(&efivars->lock); |
5ee9c198 MG |
1308 | efivars->walk_entry = list_first_entry(&efivars->list, |
1309 | struct efivar_entry, list); | |
1310 | return 0; | |
1311 | } | |
1312 | ||
1313 | static int efi_pstore_close(struct pstore_info *psi) | |
1314 | { | |
1315 | struct efivars *efivars = psi->data; | |
1316 | ||
81fa4e58 | 1317 | spin_unlock_irq(&efivars->lock); |
5ee9c198 MG |
1318 | return 0; |
1319 | } | |
1320 | ||
1321 | static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, | |
755d4fe4 | 1322 | int *count, struct timespec *timespec, |
f6f82851 | 1323 | char **buf, struct pstore_info *psi) |
5ee9c198 MG |
1324 | { |
1325 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; | |
1326 | struct efivars *efivars = psi->data; | |
1327 | char name[DUMP_NAME_LEN]; | |
1328 | int i; | |
755d4fe4 | 1329 | int cnt; |
5ee9c198 MG |
1330 | unsigned int part, size; |
1331 | unsigned long time; | |
1332 | ||
1333 | while (&efivars->walk_entry->list != &efivars->list) { | |
1334 | if (!efi_guidcmp(efivars->walk_entry->var.VendorGuid, | |
1335 | vendor)) { | |
1336 | for (i = 0; i < DUMP_NAME_LEN; i++) { | |
1337 | name[i] = efivars->walk_entry->var.VariableName[i]; | |
1338 | } | |
755d4fe4 SA |
1339 | if (sscanf(name, "dump-type%u-%u-%d-%lu", |
1340 | type, &part, &cnt, &time) == 4) { | |
5ee9c198 | 1341 | *id = part; |
755d4fe4 | 1342 | *count = cnt; |
5ee9c198 MG |
1343 | timespec->tv_sec = time; |
1344 | timespec->tv_nsec = 0; | |
0f7de85a SA |
1345 | } else if (sscanf(name, "dump-type%u-%u-%lu", |
1346 | type, &part, &time) == 3) { | |
1347 | /* | |
1348 | * Check if an old format, | |
1349 | * which doesn't support holding | |
1350 | * multiple logs, remains. | |
1351 | */ | |
1352 | *id = part; | |
1353 | *count = 0; | |
1354 | timespec->tv_sec = time; | |
1355 | timespec->tv_nsec = 0; | |
1356 | } else { | |
1357 | efivars->walk_entry = list_entry( | |
1358 | efivars->walk_entry->list.next, | |
1359 | struct efivar_entry, list); | |
1360 | continue; | |
5ee9c198 | 1361 | } |
0f7de85a SA |
1362 | |
1363 | get_var_data_locked(efivars, &efivars->walk_entry->var); | |
1364 | size = efivars->walk_entry->var.DataSize; | |
1365 | *buf = kmalloc(size, GFP_KERNEL); | |
1366 | if (*buf == NULL) | |
1367 | return -ENOMEM; | |
1368 | memcpy(*buf, efivars->walk_entry->var.Data, | |
1369 | size); | |
1370 | efivars->walk_entry = list_entry( | |
1371 | efivars->walk_entry->list.next, | |
1372 | struct efivar_entry, list); | |
1373 | return size; | |
5ee9c198 MG |
1374 | } |
1375 | efivars->walk_entry = list_entry(efivars->walk_entry->list.next, | |
1376 | struct efivar_entry, list); | |
1377 | } | |
1378 | return 0; | |
1379 | } | |
1380 | ||
3d6d8d20 KC |
1381 | static int efi_pstore_write(enum pstore_type_id type, |
1382 | enum kmsg_dump_reason reason, u64 *id, | |
755d4fe4 SA |
1383 | unsigned int part, int count, size_t size, |
1384 | struct pstore_info *psi) | |
5ee9c198 MG |
1385 | { |
1386 | char name[DUMP_NAME_LEN]; | |
5ee9c198 MG |
1387 | efi_char16_t efi_name[DUMP_NAME_LEN]; |
1388 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; | |
1389 | struct efivars *efivars = psi->data; | |
b238b8fa | 1390 | int i, ret = 0; |
d80a361d | 1391 | efi_status_t status = EFI_NOT_FOUND; |
81fa4e58 | 1392 | unsigned long flags; |
5ee9c198 | 1393 | |
e59310ad SA |
1394 | if (pstore_cannot_block_path(reason)) { |
1395 | /* | |
1396 | * If the lock is taken by another cpu in non-blocking path, | |
1397 | * this driver returns without entering firmware to avoid | |
1398 | * hanging up. | |
1399 | */ | |
81fa4e58 | 1400 | if (!spin_trylock_irqsave(&efivars->lock, flags)) |
e59310ad SA |
1401 | return -EBUSY; |
1402 | } else | |
81fa4e58 | 1403 | spin_lock_irqsave(&efivars->lock, flags); |
5ee9c198 | 1404 | |
d80a361d SA |
1405 | /* |
1406 | * Check if there is a space enough to log. | |
1407 | * size: a size of logging data | |
1408 | * DUMP_NAME_LEN * 2: a maximum size of variable name | |
1409 | */ | |
68d92986 MG |
1410 | |
1411 | status = check_var_size_locked(efivars, PSTORE_EFI_ATTRIBUTES, | |
1412 | size + DUMP_NAME_LEN * 2); | |
1413 | ||
1414 | if (status) { | |
81fa4e58 | 1415 | spin_unlock_irqrestore(&efivars->lock, flags); |
d80a361d SA |
1416 | *id = part; |
1417 | return -ENOSPC; | |
1418 | } | |
1419 | ||
755d4fe4 | 1420 | sprintf(name, "dump-type%u-%u-%d-%lu", type, part, count, |
96480d9c | 1421 | get_seconds()); |
5ee9c198 MG |
1422 | |
1423 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
1424 | efi_name[i] = name[i]; | |
1425 | ||
7644c16c | 1426 | efivars->ops->set_variable(efi_name, &vendor, PSTORE_EFI_ATTRIBUTES, |
5ee9c198 MG |
1427 | size, psi->buf); |
1428 | ||
81fa4e58 | 1429 | spin_unlock_irqrestore(&efivars->lock, flags); |
5ee9c198 | 1430 | |
e971318b | 1431 | if (reason == KMSG_DUMP_OOPS && efivar_wq_enabled) |
a93bc0c6 | 1432 | schedule_work(&efivar_work); |
5ee9c198 | 1433 | |
b238b8fa CG |
1434 | *id = part; |
1435 | return ret; | |
5ee9c198 MG |
1436 | }; |
1437 | ||
755d4fe4 | 1438 | static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count, |
a9efd39c | 1439 | struct timespec time, struct pstore_info *psi) |
5ee9c198 | 1440 | { |
a9efd39c | 1441 | char name[DUMP_NAME_LEN]; |
dd230fec | 1442 | efi_char16_t efi_name[DUMP_NAME_LEN]; |
f94ec0c0 SA |
1443 | char name_old[DUMP_NAME_LEN]; |
1444 | efi_char16_t efi_name_old[DUMP_NAME_LEN]; | |
dd230fec SA |
1445 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; |
1446 | struct efivars *efivars = psi->data; | |
1447 | struct efivar_entry *entry, *found = NULL; | |
1448 | int i; | |
1449 | ||
755d4fe4 | 1450 | sprintf(name, "dump-type%u-%u-%d-%lu", type, (unsigned int)id, count, |
a9efd39c | 1451 | time.tv_sec); |
dd230fec | 1452 | |
81fa4e58 | 1453 | spin_lock_irq(&efivars->lock); |
dd230fec SA |
1454 | |
1455 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
a9efd39c | 1456 | efi_name[i] = name[i]; |
dd230fec SA |
1457 | |
1458 | /* | |
a9efd39c | 1459 | * Clean up an entry with the same name |
dd230fec SA |
1460 | */ |
1461 | ||
1462 | list_for_each_entry(entry, &efivars->list, list) { | |
1463 | get_var_data_locked(efivars, &entry->var); | |
1464 | ||
1465 | if (efi_guidcmp(entry->var.VendorGuid, vendor)) | |
1466 | continue; | |
1467 | if (utf16_strncmp(entry->var.VariableName, efi_name, | |
f94ec0c0 SA |
1468 | utf16_strlen(efi_name))) { |
1469 | /* | |
1470 | * Check if an old format, | |
1471 | * which doesn't support holding | |
1472 | * multiple logs, remains. | |
1473 | */ | |
1474 | sprintf(name_old, "dump-type%u-%u-%lu", type, | |
1475 | (unsigned int)id, time.tv_sec); | |
1476 | ||
1477 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
1478 | efi_name_old[i] = name_old[i]; | |
1479 | ||
1480 | if (utf16_strncmp(entry->var.VariableName, efi_name_old, | |
1481 | utf16_strlen(efi_name_old))) | |
1482 | continue; | |
1483 | } | |
dd230fec SA |
1484 | |
1485 | /* found */ | |
1486 | found = entry; | |
1487 | efivars->ops->set_variable(entry->var.VariableName, | |
1488 | &entry->var.VendorGuid, | |
1489 | PSTORE_EFI_ATTRIBUTES, | |
1490 | 0, NULL); | |
a9efd39c | 1491 | break; |
dd230fec SA |
1492 | } |
1493 | ||
1494 | if (found) | |
1495 | list_del(&found->list); | |
1496 | ||
81fa4e58 | 1497 | spin_unlock_irq(&efivars->lock); |
dd230fec SA |
1498 | |
1499 | if (found) | |
1500 | efivar_unregister(found); | |
5ee9c198 MG |
1501 | |
1502 | return 0; | |
1503 | } | |
5ee9c198 MG |
1504 | |
1505 | static struct pstore_info efi_pstore_info = { | |
1506 | .owner = THIS_MODULE, | |
1507 | .name = "efi", | |
1508 | .open = efi_pstore_open, | |
1509 | .close = efi_pstore_close, | |
1510 | .read = efi_pstore_read, | |
1511 | .write = efi_pstore_write, | |
1512 | .erase = efi_pstore_erase, | |
1513 | }; | |
1da177e4 | 1514 | |
ed9dc8ce SF |
1515 | static void efivar_pstore_register(struct efivars *efivars) |
1516 | { | |
1517 | efivars->efi_pstore_info = efi_pstore_info; | |
1518 | efivars->efi_pstore_info.buf = kmalloc(4096, GFP_KERNEL); | |
1519 | if (efivars->efi_pstore_info.buf) { | |
1520 | efivars->efi_pstore_info.bufsize = 1024; | |
1521 | efivars->efi_pstore_info.data = efivars; | |
1522 | spin_lock_init(&efivars->efi_pstore_info.buf_lock); | |
1523 | pstore_register(&efivars->efi_pstore_info); | |
1524 | } | |
1525 | } | |
1526 | #else | |
1527 | static void efivar_pstore_register(struct efivars *efivars) | |
1528 | { | |
1529 | return; | |
1530 | } | |
1531 | #endif | |
1532 | ||
2c3c8bea | 1533 | static ssize_t efivar_create(struct file *filp, struct kobject *kobj, |
97fa5bb7 GKH |
1534 | struct bin_attribute *bin_attr, |
1535 | char *buf, loff_t pos, size_t count) | |
1da177e4 LT |
1536 | { |
1537 | struct efi_variable *new_var = (struct efi_variable *)buf; | |
4142ef14 | 1538 | struct efivars *efivars = bin_attr->private; |
496a0fc8 | 1539 | struct efivar_entry *search_efivar, *n; |
1da177e4 | 1540 | unsigned long strsize1, strsize2; |
1da177e4 LT |
1541 | efi_status_t status = EFI_NOT_FOUND; |
1542 | int found = 0; | |
1543 | ||
1544 | if (!capable(CAP_SYS_ADMIN)) | |
1545 | return -EACCES; | |
1546 | ||
fec6c20b MG |
1547 | if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 || |
1548 | validate_var(new_var, new_var->Data, new_var->DataSize) == false) { | |
1549 | printk(KERN_ERR "efivars: Malformed variable content\n"); | |
1550 | return -EINVAL; | |
1551 | } | |
1552 | ||
81fa4e58 | 1553 | spin_lock_irq(&efivars->lock); |
1da177e4 LT |
1554 | |
1555 | /* | |
1556 | * Does this variable already exist? | |
1557 | */ | |
29422693 | 1558 | list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
a2940908 MW |
1559 | strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); |
1560 | strsize2 = utf16_strsize(new_var->VariableName, 1024); | |
1da177e4 LT |
1561 | if (strsize1 == strsize2 && |
1562 | !memcmp(&(search_efivar->var.VariableName), | |
1563 | new_var->VariableName, strsize1) && | |
1564 | !efi_guidcmp(search_efivar->var.VendorGuid, | |
1565 | new_var->VendorGuid)) { | |
1566 | found = 1; | |
1567 | break; | |
1568 | } | |
1569 | } | |
1570 | if (found) { | |
81fa4e58 | 1571 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1572 | return -EINVAL; |
1573 | } | |
1574 | ||
68d92986 MG |
1575 | status = check_var_size_locked(efivars, new_var->Attributes, |
1576 | new_var->DataSize + utf16_strsize(new_var->VariableName, 1024)); | |
1577 | ||
1578 | if (status && status != EFI_UNSUPPORTED) { | |
1579 | spin_unlock_irq(&efivars->lock); | |
1580 | return efi_status_to_err(status); | |
1581 | } | |
1582 | ||
1da177e4 | 1583 | /* now *really* create the variable via EFI */ |
3295814d MW |
1584 | status = efivars->ops->set_variable(new_var->VariableName, |
1585 | &new_var->VendorGuid, | |
1586 | new_var->Attributes, | |
1587 | new_var->DataSize, | |
1588 | new_var->Data); | |
1da177e4 LT |
1589 | |
1590 | if (status != EFI_SUCCESS) { | |
1591 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
1592 | status); | |
81fa4e58 | 1593 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1594 | return -EIO; |
1595 | } | |
81fa4e58 | 1596 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1597 | |
1598 | /* Create the entry in sysfs. Locking is not required here */ | |
4142ef14 | 1599 | status = efivar_create_sysfs_entry(efivars, |
a2940908 MW |
1600 | utf16_strsize(new_var->VariableName, |
1601 | 1024), | |
4142ef14 MW |
1602 | new_var->VariableName, |
1603 | &new_var->VendorGuid); | |
1da177e4 LT |
1604 | if (status) { |
1605 | printk(KERN_WARNING "efivars: variable created, but sysfs entry wasn't.\n"); | |
1606 | } | |
1607 | return count; | |
1608 | } | |
1609 | ||
2c3c8bea | 1610 | static ssize_t efivar_delete(struct file *filp, struct kobject *kobj, |
97fa5bb7 GKH |
1611 | struct bin_attribute *bin_attr, |
1612 | char *buf, loff_t pos, size_t count) | |
1da177e4 LT |
1613 | { |
1614 | struct efi_variable *del_var = (struct efi_variable *)buf; | |
4142ef14 | 1615 | struct efivars *efivars = bin_attr->private; |
496a0fc8 | 1616 | struct efivar_entry *search_efivar, *n; |
1da177e4 | 1617 | unsigned long strsize1, strsize2; |
1da177e4 LT |
1618 | efi_status_t status = EFI_NOT_FOUND; |
1619 | int found = 0; | |
1620 | ||
1621 | if (!capable(CAP_SYS_ADMIN)) | |
1622 | return -EACCES; | |
1623 | ||
81fa4e58 | 1624 | spin_lock_irq(&efivars->lock); |
1da177e4 LT |
1625 | |
1626 | /* | |
1627 | * Does this variable already exist? | |
1628 | */ | |
29422693 | 1629 | list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
a2940908 MW |
1630 | strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); |
1631 | strsize2 = utf16_strsize(del_var->VariableName, 1024); | |
1da177e4 LT |
1632 | if (strsize1 == strsize2 && |
1633 | !memcmp(&(search_efivar->var.VariableName), | |
1634 | del_var->VariableName, strsize1) && | |
1635 | !efi_guidcmp(search_efivar->var.VendorGuid, | |
1636 | del_var->VendorGuid)) { | |
1637 | found = 1; | |
1638 | break; | |
1639 | } | |
1640 | } | |
1641 | if (!found) { | |
81fa4e58 | 1642 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1643 | return -EINVAL; |
1644 | } | |
1645 | /* force the Attributes/DataSize to 0 to ensure deletion */ | |
1646 | del_var->Attributes = 0; | |
1647 | del_var->DataSize = 0; | |
1648 | ||
3295814d MW |
1649 | status = efivars->ops->set_variable(del_var->VariableName, |
1650 | &del_var->VendorGuid, | |
1651 | del_var->Attributes, | |
1652 | del_var->DataSize, | |
1653 | del_var->Data); | |
1da177e4 LT |
1654 | |
1655 | if (status != EFI_SUCCESS) { | |
1656 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
1657 | status); | |
81fa4e58 | 1658 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1659 | return -EIO; |
1660 | } | |
496a0fc8 | 1661 | list_del(&search_efivar->list); |
1da177e4 | 1662 | /* We need to release this lock before unregistering. */ |
81fa4e58 | 1663 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1664 | efivar_unregister(search_efivar); |
1665 | ||
1666 | /* It's dead Jim.... */ | |
1667 | return count; | |
1668 | } | |
1669 | ||
a93bc0c6 SA |
1670 | static bool variable_is_present(efi_char16_t *variable_name, efi_guid_t *vendor) |
1671 | { | |
1672 | struct efivar_entry *entry, *n; | |
1673 | struct efivars *efivars = &__efivars; | |
1674 | unsigned long strsize1, strsize2; | |
1675 | bool found = false; | |
1676 | ||
1677 | strsize1 = utf16_strsize(variable_name, 1024); | |
1678 | list_for_each_entry_safe(entry, n, &efivars->list, list) { | |
1679 | strsize2 = utf16_strsize(entry->var.VariableName, 1024); | |
1680 | if (strsize1 == strsize2 && | |
1681 | !memcmp(variable_name, &(entry->var.VariableName), | |
1682 | strsize2) && | |
1683 | !efi_guidcmp(entry->var.VendorGuid, | |
1684 | *vendor)) { | |
1685 | found = true; | |
1686 | break; | |
1687 | } | |
1688 | } | |
1689 | return found; | |
1690 | } | |
1691 | ||
ec50bd32 MF |
1692 | /* |
1693 | * Returns the size of variable_name, in bytes, including the | |
1694 | * terminating NULL character, or variable_name_size if no NULL | |
1695 | * character is found among the first variable_name_size bytes. | |
1696 | */ | |
1697 | static unsigned long var_name_strnsize(efi_char16_t *variable_name, | |
1698 | unsigned long variable_name_size) | |
1699 | { | |
1700 | unsigned long len; | |
1701 | efi_char16_t c; | |
1702 | ||
1703 | /* | |
1704 | * The variable name is, by definition, a NULL-terminated | |
1705 | * string, so make absolutely sure that variable_name_size is | |
1706 | * the value we expect it to be. If not, return the real size. | |
1707 | */ | |
1708 | for (len = 2; len <= variable_name_size; len += sizeof(c)) { | |
1709 | c = variable_name[(len / sizeof(c)) - 1]; | |
1710 | if (!c) | |
1711 | break; | |
1712 | } | |
1713 | ||
1714 | return min(len, variable_name_size); | |
1715 | } | |
1716 | ||
a93bc0c6 SA |
1717 | static void efivar_update_sysfs_entries(struct work_struct *work) |
1718 | { | |
1719 | struct efivars *efivars = &__efivars; | |
1720 | efi_guid_t vendor; | |
1721 | efi_char16_t *variable_name; | |
1722 | unsigned long variable_name_size = 1024; | |
1723 | efi_status_t status = EFI_NOT_FOUND; | |
1724 | bool found; | |
1725 | ||
1726 | /* Add new sysfs entries */ | |
1727 | while (1) { | |
1728 | variable_name = kzalloc(variable_name_size, GFP_KERNEL); | |
1729 | if (!variable_name) { | |
1730 | pr_err("efivars: Memory allocation failed.\n"); | |
1731 | return; | |
1732 | } | |
1733 | ||
1734 | spin_lock_irq(&efivars->lock); | |
1735 | found = false; | |
1736 | while (1) { | |
1737 | variable_name_size = 1024; | |
1738 | status = efivars->ops->get_next_variable( | |
1739 | &variable_name_size, | |
1740 | variable_name, | |
1741 | &vendor); | |
1742 | if (status != EFI_SUCCESS) { | |
1743 | break; | |
1744 | } else { | |
1745 | if (!variable_is_present(variable_name, | |
1746 | &vendor)) { | |
1747 | found = true; | |
1748 | break; | |
1749 | } | |
1750 | } | |
1751 | } | |
1752 | spin_unlock_irq(&efivars->lock); | |
1753 | ||
1754 | if (!found) { | |
1755 | kfree(variable_name); | |
1756 | break; | |
ec50bd32 MF |
1757 | } else { |
1758 | variable_name_size = var_name_strnsize(variable_name, | |
1759 | variable_name_size); | |
a93bc0c6 SA |
1760 | efivar_create_sysfs_entry(efivars, |
1761 | variable_name_size, | |
1762 | variable_name, &vendor); | |
ec50bd32 | 1763 | } |
a93bc0c6 SA |
1764 | } |
1765 | } | |
1766 | ||
1da177e4 LT |
1767 | /* |
1768 | * Let's not leave out systab information that snuck into | |
1769 | * the efivars driver | |
1770 | */ | |
334c6307 GKH |
1771 | static ssize_t systab_show(struct kobject *kobj, |
1772 | struct kobj_attribute *attr, char *buf) | |
1da177e4 LT |
1773 | { |
1774 | char *str = buf; | |
1775 | ||
334c6307 | 1776 | if (!kobj || !buf) |
1da177e4 LT |
1777 | return -EINVAL; |
1778 | ||
b2c99e3c BH |
1779 | if (efi.mps != EFI_INVALID_TABLE_ADDR) |
1780 | str += sprintf(str, "MPS=0x%lx\n", efi.mps); | |
1781 | if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) | |
1782 | str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20); | |
1783 | if (efi.acpi != EFI_INVALID_TABLE_ADDR) | |
1784 | str += sprintf(str, "ACPI=0x%lx\n", efi.acpi); | |
1785 | if (efi.smbios != EFI_INVALID_TABLE_ADDR) | |
1786 | str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios); | |
1787 | if (efi.hcdp != EFI_INVALID_TABLE_ADDR) | |
1788 | str += sprintf(str, "HCDP=0x%lx\n", efi.hcdp); | |
1789 | if (efi.boot_info != EFI_INVALID_TABLE_ADDR) | |
1790 | str += sprintf(str, "BOOTINFO=0x%lx\n", efi.boot_info); | |
1791 | if (efi.uga != EFI_INVALID_TABLE_ADDR) | |
1792 | str += sprintf(str, "UGA=0x%lx\n", efi.uga); | |
1da177e4 LT |
1793 | |
1794 | return str - buf; | |
1795 | } | |
1796 | ||
334c6307 GKH |
1797 | static struct kobj_attribute efi_attr_systab = |
1798 | __ATTR(systab, 0400, systab_show, NULL); | |
1da177e4 | 1799 | |
334c6307 GKH |
1800 | static struct attribute *efi_subsys_attrs[] = { |
1801 | &efi_attr_systab.attr, | |
1da177e4 LT |
1802 | NULL, /* maybe more in the future? */ |
1803 | }; | |
1804 | ||
334c6307 GKH |
1805 | static struct attribute_group efi_subsys_attr_group = { |
1806 | .attrs = efi_subsys_attrs, | |
1807 | }; | |
1808 | ||
bc87d2fe | 1809 | static struct kobject *efi_kobj; |
1da177e4 LT |
1810 | |
1811 | /* | |
1812 | * efivar_create_sysfs_entry() | |
1813 | * Requires: | |
1814 | * variable_name_size = number of bytes required to hold | |
1815 | * variable_name (not counting the NULL | |
1816 | * character at the end. | |
29422693 | 1817 | * efivars->lock is not held on entry or exit. |
1da177e4 LT |
1818 | * Returns 1 on failure, 0 on success |
1819 | */ | |
1820 | static int | |
4142ef14 MW |
1821 | efivar_create_sysfs_entry(struct efivars *efivars, |
1822 | unsigned long variable_name_size, | |
1823 | efi_char16_t *variable_name, | |
1824 | efi_guid_t *vendor_guid) | |
1da177e4 | 1825 | { |
310ad754 | 1826 | int i, short_name_size; |
1da177e4 LT |
1827 | char *short_name; |
1828 | struct efivar_entry *new_efivar; | |
1829 | ||
310ad754 JK |
1830 | /* |
1831 | * Length of the variable bytes in ASCII, plus the '-' separator, | |
1832 | * plus the GUID, plus trailing NUL | |
1833 | */ | |
1834 | short_name_size = variable_name_size / sizeof(efi_char16_t) | |
1835 | + 1 + GUID_LEN + 1; | |
1836 | ||
1837 | short_name = kzalloc(short_name_size, GFP_KERNEL); | |
9c215384 | 1838 | new_efivar = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL); |
1da177e4 LT |
1839 | |
1840 | if (!short_name || !new_efivar) { | |
0933ad9c JJ |
1841 | kfree(short_name); |
1842 | kfree(new_efivar); | |
1da177e4 LT |
1843 | return 1; |
1844 | } | |
1da177e4 | 1845 | |
4142ef14 | 1846 | new_efivar->efivars = efivars; |
1da177e4 LT |
1847 | memcpy(new_efivar->var.VariableName, variable_name, |
1848 | variable_name_size); | |
1849 | memcpy(&(new_efivar->var.VendorGuid), vendor_guid, sizeof(efi_guid_t)); | |
1850 | ||
1851 | /* Convert Unicode to normal chars (assume top bits are 0), | |
1852 | ala UTF-8 */ | |
1853 | for (i=0; i < (int)(variable_name_size / sizeof(efi_char16_t)); i++) { | |
1854 | short_name[i] = variable_name[i] & 0xFF; | |
1855 | } | |
1856 | /* This is ugly, but necessary to separate one vendor's | |
1857 | private variables from another's. */ | |
1858 | ||
1859 | *(short_name + strlen(short_name)) = '-'; | |
1860 | efi_guid_unparse(vendor_guid, short_name + strlen(short_name)); | |
1861 | ||
29422693 | 1862 | new_efivar->kobj.kset = efivars->kset; |
d6d292c4 GKH |
1863 | i = kobject_init_and_add(&new_efivar->kobj, &efivar_ktype, NULL, |
1864 | "%s", short_name); | |
69b2186c JG |
1865 | if (i) { |
1866 | kfree(short_name); | |
1867 | kfree(new_efivar); | |
1868 | return 1; | |
1869 | } | |
1da177e4 | 1870 | |
d6d292c4 | 1871 | kobject_uevent(&new_efivar->kobj, KOBJ_ADD); |
0933ad9c JJ |
1872 | kfree(short_name); |
1873 | short_name = NULL; | |
1da177e4 | 1874 | |
81fa4e58 | 1875 | spin_lock_irq(&efivars->lock); |
29422693 | 1876 | list_add(&new_efivar->list, &efivars->list); |
81fa4e58 | 1877 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1878 | |
1879 | return 0; | |
1880 | } | |
d502fbb0 MW |
1881 | |
1882 | static int | |
1883 | create_efivars_bin_attributes(struct efivars *efivars) | |
1884 | { | |
1885 | struct bin_attribute *attr; | |
1886 | int error; | |
1887 | ||
1888 | /* new_var */ | |
1889 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
1890 | if (!attr) | |
1891 | return -ENOMEM; | |
1892 | ||
1893 | attr->attr.name = "new_var"; | |
1894 | attr->attr.mode = 0200; | |
1895 | attr->write = efivar_create; | |
1896 | attr->private = efivars; | |
1897 | efivars->new_var = attr; | |
1898 | ||
1899 | /* del_var */ | |
1900 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
1901 | if (!attr) { | |
1902 | error = -ENOMEM; | |
1903 | goto out_free; | |
1904 | } | |
1905 | attr->attr.name = "del_var"; | |
1906 | attr->attr.mode = 0200; | |
1907 | attr->write = efivar_delete; | |
1908 | attr->private = efivars; | |
1909 | efivars->del_var = attr; | |
1910 | ||
1911 | sysfs_bin_attr_init(efivars->new_var); | |
1912 | sysfs_bin_attr_init(efivars->del_var); | |
1913 | ||
1914 | /* Register */ | |
1915 | error = sysfs_create_bin_file(&efivars->kset->kobj, | |
1916 | efivars->new_var); | |
1917 | if (error) { | |
1918 | printk(KERN_ERR "efivars: unable to create new_var sysfs file" | |
1919 | " due to error %d\n", error); | |
1920 | goto out_free; | |
1921 | } | |
1922 | error = sysfs_create_bin_file(&efivars->kset->kobj, | |
1923 | efivars->del_var); | |
1924 | if (error) { | |
1925 | printk(KERN_ERR "efivars: unable to create del_var sysfs file" | |
1926 | " due to error %d\n", error); | |
1927 | sysfs_remove_bin_file(&efivars->kset->kobj, | |
1928 | efivars->new_var); | |
1929 | goto out_free; | |
1930 | } | |
1931 | ||
1932 | return 0; | |
1933 | out_free: | |
051d51bc DC |
1934 | kfree(efivars->del_var); |
1935 | efivars->del_var = NULL; | |
d502fbb0 MW |
1936 | kfree(efivars->new_var); |
1937 | efivars->new_var = NULL; | |
1938 | return error; | |
1939 | } | |
1940 | ||
4fc756bd | 1941 | void unregister_efivars(struct efivars *efivars) |
76b53f7c MW |
1942 | { |
1943 | struct efivar_entry *entry, *n; | |
4142ef14 | 1944 | |
76b53f7c | 1945 | list_for_each_entry_safe(entry, n, &efivars->list, list) { |
81fa4e58 | 1946 | spin_lock_irq(&efivars->lock); |
76b53f7c | 1947 | list_del(&entry->list); |
81fa4e58 | 1948 | spin_unlock_irq(&efivars->lock); |
76b53f7c MW |
1949 | efivar_unregister(entry); |
1950 | } | |
1951 | if (efivars->new_var) | |
1952 | sysfs_remove_bin_file(&efivars->kset->kobj, efivars->new_var); | |
1953 | if (efivars->del_var) | |
1954 | sysfs_remove_bin_file(&efivars->kset->kobj, efivars->del_var); | |
1955 | kfree(efivars->new_var); | |
1956 | kfree(efivars->del_var); | |
605e70c7 | 1957 | kobject_put(efivars->kobject); |
76b53f7c MW |
1958 | kset_unregister(efivars->kset); |
1959 | } | |
4fc756bd | 1960 | EXPORT_SYMBOL_GPL(unregister_efivars); |
1da177e4 | 1961 | |
e971318b MF |
1962 | /* |
1963 | * Print a warning when duplicate EFI variables are encountered and | |
1964 | * disable the sysfs workqueue since the firmware is buggy. | |
1965 | */ | |
1966 | static void dup_variable_bug(efi_char16_t *s16, efi_guid_t *vendor_guid, | |
1967 | unsigned long len16) | |
1968 | { | |
1969 | size_t i, len8 = len16 / sizeof(efi_char16_t); | |
1970 | char *s8; | |
1971 | ||
1972 | /* | |
1973 | * Disable the workqueue since the algorithm it uses for | |
1974 | * detecting new variables won't work with this buggy | |
1975 | * implementation of GetNextVariableName(). | |
1976 | */ | |
1977 | efivar_wq_enabled = false; | |
1978 | ||
1979 | s8 = kzalloc(len8, GFP_KERNEL); | |
1980 | if (!s8) | |
1981 | return; | |
1982 | ||
1983 | for (i = 0; i < len8; i++) | |
1984 | s8[i] = s16[i]; | |
1985 | ||
1986 | printk(KERN_WARNING "efivars: duplicate variable: %s-%pUl\n", | |
1987 | s8, vendor_guid); | |
1988 | kfree(s8); | |
1989 | } | |
1990 | ||
4fc756bd MW |
1991 | int register_efivars(struct efivars *efivars, |
1992 | const struct efivar_operations *ops, | |
1993 | struct kobject *parent_kobj) | |
1da177e4 LT |
1994 | { |
1995 | efi_status_t status = EFI_NOT_FOUND; | |
1996 | efi_guid_t vendor_guid; | |
1997 | efi_char16_t *variable_name; | |
1da177e4 | 1998 | unsigned long variable_name_size = 1024; |
334c6307 | 1999 | int error = 0; |
1da177e4 | 2000 | |
9c215384 | 2001 | variable_name = kzalloc(variable_name_size, GFP_KERNEL); |
1da177e4 LT |
2002 | if (!variable_name) { |
2003 | printk(KERN_ERR "efivars: Memory allocation failed.\n"); | |
2004 | return -ENOMEM; | |
2005 | } | |
2006 | ||
29422693 MW |
2007 | spin_lock_init(&efivars->lock); |
2008 | INIT_LIST_HEAD(&efivars->list); | |
3295814d | 2009 | efivars->ops = ops; |
29422693 | 2010 | |
76b53f7c | 2011 | efivars->kset = kset_create_and_add("vars", NULL, parent_kobj); |
29422693 | 2012 | if (!efivars->kset) { |
66ac831e GKH |
2013 | printk(KERN_ERR "efivars: Subsystem registration failed.\n"); |
2014 | error = -ENOMEM; | |
76b53f7c | 2015 | goto out; |
1da177e4 LT |
2016 | } |
2017 | ||
605e70c7 LCY |
2018 | efivars->kobject = kobject_create_and_add("efivars", parent_kobj); |
2019 | if (!efivars->kobject) { | |
2020 | pr_err("efivars: Subsystem registration failed.\n"); | |
2021 | error = -ENOMEM; | |
2022 | kset_unregister(efivars->kset); | |
2023 | goto out; | |
2024 | } | |
2025 | ||
1da177e4 LT |
2026 | /* |
2027 | * Per EFI spec, the maximum storage allocated for both | |
2028 | * the variable name and variable data is 1024 bytes. | |
2029 | */ | |
2030 | ||
2031 | do { | |
2032 | variable_name_size = 1024; | |
2033 | ||
3295814d | 2034 | status = ops->get_next_variable(&variable_name_size, |
1da177e4 LT |
2035 | variable_name, |
2036 | &vendor_guid); | |
2037 | switch (status) { | |
2038 | case EFI_SUCCESS: | |
ec50bd32 MF |
2039 | variable_name_size = var_name_strnsize(variable_name, |
2040 | variable_name_size); | |
e971318b MF |
2041 | |
2042 | /* | |
2043 | * Some firmware implementations return the | |
2044 | * same variable name on multiple calls to | |
2045 | * get_next_variable(). Terminate the loop | |
2046 | * immediately as there is no guarantee that | |
2047 | * we'll ever see a different variable name, | |
2048 | * and may end up looping here forever. | |
2049 | */ | |
2050 | if (variable_is_present(variable_name, &vendor_guid)) { | |
2051 | dup_variable_bug(variable_name, &vendor_guid, | |
2052 | variable_name_size); | |
2053 | status = EFI_NOT_FOUND; | |
2054 | break; | |
2055 | } | |
2056 | ||
4142ef14 MW |
2057 | efivar_create_sysfs_entry(efivars, |
2058 | variable_name_size, | |
2059 | variable_name, | |
2060 | &vendor_guid); | |
1da177e4 LT |
2061 | break; |
2062 | case EFI_NOT_FOUND: | |
2063 | break; | |
2064 | default: | |
2065 | printk(KERN_WARNING "efivars: get_next_variable: status=%lx\n", | |
2066 | status); | |
2067 | status = EFI_NOT_FOUND; | |
2068 | break; | |
2069 | } | |
2070 | } while (status != EFI_NOT_FOUND); | |
2071 | ||
d502fbb0 | 2072 | error = create_efivars_bin_attributes(efivars); |
1da177e4 | 2073 | if (error) |
76b53f7c | 2074 | unregister_efivars(efivars); |
1da177e4 | 2075 | |
ec0971ba SF |
2076 | if (!efivars_pstore_disable) |
2077 | efivar_pstore_register(efivars); | |
5ee9c198 | 2078 | |
5d9db883 MG |
2079 | register_filesystem(&efivarfs_type); |
2080 | ||
76b53f7c MW |
2081 | out: |
2082 | kfree(variable_name); | |
1da177e4 | 2083 | |
76b53f7c MW |
2084 | return error; |
2085 | } | |
4fc756bd | 2086 | EXPORT_SYMBOL_GPL(register_efivars); |
1da177e4 | 2087 | |
76b53f7c MW |
2088 | /* |
2089 | * For now we register the efi subsystem with the firmware subsystem | |
2090 | * and the vars subsystem with the efi subsystem. In the future, it | |
2091 | * might make sense to split off the efi subsystem into its own | |
2092 | * driver, but for now only efivars will register with it, so just | |
2093 | * include it here. | |
2094 | */ | |
2095 | ||
2096 | static int __init | |
2097 | efivars_init(void) | |
2098 | { | |
2099 | int error = 0; | |
2100 | ||
2101 | printk(KERN_INFO "EFI Variables Facility v%s %s\n", EFIVARS_VERSION, | |
2102 | EFIVARS_DATE); | |
2103 | ||
83e68189 | 2104 | if (!efi_enabled(EFI_RUNTIME_SERVICES)) |
4fc756bd | 2105 | return 0; |
76b53f7c MW |
2106 | |
2107 | /* For now we'll register the efi directory at /sys/firmware/efi */ | |
2108 | efi_kobj = kobject_create_and_add("efi", firmware_kobj); | |
2109 | if (!efi_kobj) { | |
2110 | printk(KERN_ERR "efivars: Firmware registration failed.\n"); | |
2111 | return -ENOMEM; | |
2112 | } | |
2113 | ||
3295814d MW |
2114 | ops.get_variable = efi.get_variable; |
2115 | ops.set_variable = efi.set_variable; | |
2116 | ops.get_next_variable = efi.get_next_variable; | |
d80a361d | 2117 | ops.query_variable_info = efi.query_variable_info; |
89d16665 | 2118 | |
3295814d | 2119 | error = register_efivars(&__efivars, &ops, efi_kobj); |
3116aabc DC |
2120 | if (error) |
2121 | goto err_put; | |
76b53f7c MW |
2122 | |
2123 | /* Don't forget the systab entry */ | |
2124 | error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group); | |
2125 | if (error) { | |
2126 | printk(KERN_ERR | |
2127 | "efivars: Sysfs attribute export failed with error %d.\n", | |
2128 | error); | |
3116aabc | 2129 | goto err_unregister; |
76b53f7c | 2130 | } |
1da177e4 | 2131 | |
3116aabc DC |
2132 | return 0; |
2133 | ||
2134 | err_unregister: | |
2135 | unregister_efivars(&__efivars); | |
2136 | err_put: | |
2137 | kobject_put(efi_kobj); | |
1da177e4 LT |
2138 | return error; |
2139 | } | |
2140 | ||
2141 | static void __exit | |
2142 | efivars_exit(void) | |
2143 | { | |
a93bc0c6 SA |
2144 | cancel_work_sync(&efivar_work); |
2145 | ||
83e68189 | 2146 | if (efi_enabled(EFI_RUNTIME_SERVICES)) { |
aabb6e15 RD |
2147 | unregister_efivars(&__efivars); |
2148 | kobject_put(efi_kobj); | |
2149 | } | |
1da177e4 LT |
2150 | } |
2151 | ||
2152 | module_init(efivars_init); | |
2153 | module_exit(efivars_exit); | |
2154 |