Commit | Line | Data |
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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 | |
1da177e4 LT |
106 | /* |
107 | * The maximum size of VariableName + Data = 1024 | |
108 | * Therefore, it's reasonable to save that much | |
109 | * space in each part of the structure, | |
110 | * and we use a page for reading/writing. | |
111 | */ | |
112 | ||
113 | struct efi_variable { | |
114 | efi_char16_t VariableName[1024/sizeof(efi_char16_t)]; | |
115 | efi_guid_t VendorGuid; | |
116 | unsigned long DataSize; | |
117 | __u8 Data[1024]; | |
118 | efi_status_t Status; | |
119 | __u32 Attributes; | |
120 | } __attribute__((packed)); | |
121 | ||
1da177e4 | 122 | struct efivar_entry { |
4142ef14 | 123 | struct efivars *efivars; |
1da177e4 LT |
124 | struct efi_variable var; |
125 | struct list_head list; | |
126 | struct kobject kobj; | |
127 | }; | |
128 | ||
1da177e4 LT |
129 | struct efivar_attribute { |
130 | struct attribute attr; | |
131 | ssize_t (*show) (struct efivar_entry *entry, char *buf); | |
132 | ssize_t (*store)(struct efivar_entry *entry, const char *buf, size_t count); | |
133 | }; | |
134 | ||
5d9db883 MG |
135 | static struct efivars __efivars; |
136 | static struct efivar_operations ops; | |
137 | ||
7644c16c MW |
138 | #define PSTORE_EFI_ATTRIBUTES \ |
139 | (EFI_VARIABLE_NON_VOLATILE | \ | |
140 | EFI_VARIABLE_BOOTSERVICE_ACCESS | \ | |
141 | EFI_VARIABLE_RUNTIME_ACCESS) | |
1da177e4 | 142 | |
1da177e4 LT |
143 | #define EFIVAR_ATTR(_name, _mode, _show, _store) \ |
144 | struct efivar_attribute efivar_attr_##_name = { \ | |
7b595756 | 145 | .attr = {.name = __stringify(_name), .mode = _mode}, \ |
1da177e4 LT |
146 | .show = _show, \ |
147 | .store = _store, \ | |
148 | }; | |
149 | ||
1da177e4 LT |
150 | #define to_efivar_attr(_attr) container_of(_attr, struct efivar_attribute, attr) |
151 | #define to_efivar_entry(obj) container_of(obj, struct efivar_entry, kobj) | |
152 | ||
153 | /* | |
154 | * Prototype for sysfs creation function | |
155 | */ | |
156 | static int | |
4142ef14 MW |
157 | efivar_create_sysfs_entry(struct efivars *efivars, |
158 | unsigned long variable_name_size, | |
159 | efi_char16_t *variable_name, | |
160 | efi_guid_t *vendor_guid); | |
1da177e4 | 161 | |
a93bc0c6 SA |
162 | /* |
163 | * Prototype for workqueue functions updating sysfs entry | |
164 | */ | |
165 | ||
166 | static void efivar_update_sysfs_entries(struct work_struct *); | |
167 | static DECLARE_WORK(efivar_work, efivar_update_sysfs_entries); | |
168 | ||
1da177e4 LT |
169 | /* Return the number of unicode characters in data */ |
170 | static unsigned long | |
a2940908 | 171 | utf16_strnlen(efi_char16_t *s, size_t maxlength) |
1da177e4 LT |
172 | { |
173 | unsigned long length = 0; | |
174 | ||
a2940908 | 175 | while (*s++ != 0 && length < maxlength) |
1da177e4 LT |
176 | length++; |
177 | return length; | |
178 | } | |
179 | ||
b728a5c8 | 180 | static inline unsigned long |
a2940908 MW |
181 | utf16_strlen(efi_char16_t *s) |
182 | { | |
183 | return utf16_strnlen(s, ~0UL); | |
184 | } | |
185 | ||
1da177e4 LT |
186 | /* |
187 | * Return the number of bytes is the length of this string | |
188 | * Note: this is NOT the same as the number of unicode characters | |
189 | */ | |
190 | static inline unsigned long | |
a2940908 | 191 | utf16_strsize(efi_char16_t *data, unsigned long maxlength) |
1da177e4 | 192 | { |
a2940908 | 193 | return utf16_strnlen(data, maxlength/sizeof(efi_char16_t)) * sizeof(efi_char16_t); |
1da177e4 LT |
194 | } |
195 | ||
828aa1f0 MW |
196 | static inline int |
197 | utf16_strncmp(const efi_char16_t *a, const efi_char16_t *b, size_t len) | |
198 | { | |
199 | while (1) { | |
200 | if (len == 0) | |
201 | return 0; | |
202 | if (*a < *b) | |
203 | return -1; | |
204 | if (*a > *b) | |
205 | return 1; | |
206 | if (*a == 0) /* implies *b == 0 */ | |
207 | return 0; | |
208 | a++; | |
209 | b++; | |
210 | len--; | |
211 | } | |
212 | } | |
213 | ||
fec6c20b | 214 | static bool |
54b3a4d3 MG |
215 | validate_device_path(struct efi_variable *var, int match, u8 *buffer, |
216 | unsigned long len) | |
fec6c20b MG |
217 | { |
218 | struct efi_generic_dev_path *node; | |
219 | int offset = 0; | |
220 | ||
221 | node = (struct efi_generic_dev_path *)buffer; | |
222 | ||
54b3a4d3 MG |
223 | if (len < sizeof(*node)) |
224 | return false; | |
fec6c20b | 225 | |
54b3a4d3 MG |
226 | while (offset <= len - sizeof(*node) && |
227 | node->length >= sizeof(*node) && | |
228 | node->length <= len - offset) { | |
229 | offset += node->length; | |
fec6c20b MG |
230 | |
231 | if ((node->type == EFI_DEV_END_PATH || | |
232 | node->type == EFI_DEV_END_PATH2) && | |
233 | node->sub_type == EFI_DEV_END_ENTIRE) | |
234 | return true; | |
235 | ||
236 | node = (struct efi_generic_dev_path *)(buffer + offset); | |
237 | } | |
238 | ||
239 | /* | |
240 | * If we're here then either node->length pointed past the end | |
241 | * of the buffer or we reached the end of the buffer without | |
242 | * finding a device path end node. | |
243 | */ | |
244 | return false; | |
245 | } | |
246 | ||
247 | static bool | |
54b3a4d3 MG |
248 | validate_boot_order(struct efi_variable *var, int match, u8 *buffer, |
249 | unsigned long len) | |
fec6c20b MG |
250 | { |
251 | /* An array of 16-bit integers */ | |
252 | if ((len % 2) != 0) | |
253 | return false; | |
254 | ||
255 | return true; | |
256 | } | |
257 | ||
258 | static bool | |
54b3a4d3 MG |
259 | validate_load_option(struct efi_variable *var, int match, u8 *buffer, |
260 | unsigned long len) | |
fec6c20b MG |
261 | { |
262 | u16 filepathlength; | |
54b3a4d3 MG |
263 | int i, desclength = 0, namelen; |
264 | ||
265 | namelen = utf16_strnlen(var->VariableName, sizeof(var->VariableName)); | |
fec6c20b MG |
266 | |
267 | /* Either "Boot" or "Driver" followed by four digits of hex */ | |
268 | for (i = match; i < match+4; i++) { | |
54b3a4d3 MG |
269 | if (var->VariableName[i] > 127 || |
270 | hex_to_bin(var->VariableName[i] & 0xff) < 0) | |
fec6c20b MG |
271 | return true; |
272 | } | |
273 | ||
54b3a4d3 MG |
274 | /* Reject it if there's 4 digits of hex and then further content */ |
275 | if (namelen > match + 4) | |
276 | return false; | |
277 | ||
278 | /* A valid entry must be at least 8 bytes */ | |
279 | if (len < 8) | |
fec6c20b MG |
280 | return false; |
281 | ||
282 | filepathlength = buffer[4] | buffer[5] << 8; | |
283 | ||
284 | /* | |
285 | * There's no stored length for the description, so it has to be | |
286 | * found by hand | |
287 | */ | |
54b3a4d3 | 288 | desclength = utf16_strsize((efi_char16_t *)(buffer + 6), len - 6) + 2; |
fec6c20b MG |
289 | |
290 | /* Each boot entry must have a descriptor */ | |
291 | if (!desclength) | |
292 | return false; | |
293 | ||
294 | /* | |
295 | * If the sum of the length of the description, the claimed filepath | |
296 | * length and the original header are greater than the length of the | |
297 | * variable, it's malformed | |
298 | */ | |
299 | if ((desclength + filepathlength + 6) > len) | |
300 | return false; | |
301 | ||
302 | /* | |
303 | * And, finally, check the filepath | |
304 | */ | |
305 | return validate_device_path(var, match, buffer + desclength + 6, | |
306 | filepathlength); | |
307 | } | |
308 | ||
309 | static bool | |
54b3a4d3 MG |
310 | validate_uint16(struct efi_variable *var, int match, u8 *buffer, |
311 | unsigned long len) | |
fec6c20b MG |
312 | { |
313 | /* A single 16-bit integer */ | |
314 | if (len != 2) | |
315 | return false; | |
316 | ||
317 | return true; | |
318 | } | |
319 | ||
320 | static bool | |
54b3a4d3 MG |
321 | validate_ascii_string(struct efi_variable *var, int match, u8 *buffer, |
322 | unsigned long len) | |
fec6c20b MG |
323 | { |
324 | int i; | |
325 | ||
326 | for (i = 0; i < len; i++) { | |
327 | if (buffer[i] > 127) | |
328 | return false; | |
329 | ||
330 | if (buffer[i] == 0) | |
331 | return true; | |
332 | } | |
333 | ||
334 | return false; | |
335 | } | |
336 | ||
337 | struct variable_validate { | |
338 | char *name; | |
339 | bool (*validate)(struct efi_variable *var, int match, u8 *data, | |
54b3a4d3 | 340 | unsigned long len); |
fec6c20b MG |
341 | }; |
342 | ||
343 | static const struct variable_validate variable_validate[] = { | |
344 | { "BootNext", validate_uint16 }, | |
345 | { "BootOrder", validate_boot_order }, | |
346 | { "DriverOrder", validate_boot_order }, | |
347 | { "Boot*", validate_load_option }, | |
348 | { "Driver*", validate_load_option }, | |
349 | { "ConIn", validate_device_path }, | |
350 | { "ConInDev", validate_device_path }, | |
351 | { "ConOut", validate_device_path }, | |
352 | { "ConOutDev", validate_device_path }, | |
353 | { "ErrOut", validate_device_path }, | |
354 | { "ErrOutDev", validate_device_path }, | |
355 | { "Timeout", validate_uint16 }, | |
356 | { "Lang", validate_ascii_string }, | |
357 | { "PlatformLang", validate_ascii_string }, | |
358 | { "", NULL }, | |
359 | }; | |
360 | ||
361 | static bool | |
54b3a4d3 | 362 | validate_var(struct efi_variable *var, u8 *data, unsigned long len) |
fec6c20b MG |
363 | { |
364 | int i; | |
365 | u16 *unicode_name = var->VariableName; | |
366 | ||
367 | for (i = 0; variable_validate[i].validate != NULL; i++) { | |
368 | const char *name = variable_validate[i].name; | |
369 | int match; | |
370 | ||
371 | for (match = 0; ; match++) { | |
372 | char c = name[match]; | |
373 | u16 u = unicode_name[match]; | |
374 | ||
375 | /* All special variables are plain ascii */ | |
376 | if (u > 127) | |
377 | return true; | |
378 | ||
379 | /* Wildcard in the matching name means we've matched */ | |
380 | if (c == '*') | |
381 | return variable_validate[i].validate(var, | |
382 | match, data, len); | |
383 | ||
384 | /* Case sensitive match */ | |
385 | if (c != u) | |
386 | break; | |
387 | ||
388 | /* Reached the end of the string while matching */ | |
389 | if (!c) | |
390 | return variable_validate[i].validate(var, | |
391 | match, data, len); | |
392 | } | |
393 | } | |
394 | ||
395 | return true; | |
396 | } | |
397 | ||
1da177e4 | 398 | static efi_status_t |
5ee9c198 | 399 | get_var_data_locked(struct efivars *efivars, struct efi_variable *var) |
1da177e4 LT |
400 | { |
401 | efi_status_t status; | |
402 | ||
1da177e4 | 403 | var->DataSize = 1024; |
3295814d MW |
404 | status = efivars->ops->get_variable(var->VariableName, |
405 | &var->VendorGuid, | |
406 | &var->Attributes, | |
407 | &var->DataSize, | |
408 | var->Data); | |
5ee9c198 MG |
409 | return status; |
410 | } | |
411 | ||
412 | static efi_status_t | |
413 | get_var_data(struct efivars *efivars, struct efi_variable *var) | |
414 | { | |
415 | efi_status_t status; | |
81fa4e58 | 416 | unsigned long flags; |
5ee9c198 | 417 | |
81fa4e58 | 418 | spin_lock_irqsave(&efivars->lock, flags); |
5ee9c198 | 419 | status = get_var_data_locked(efivars, var); |
81fa4e58 | 420 | spin_unlock_irqrestore(&efivars->lock, flags); |
5ee9c198 | 421 | |
1da177e4 LT |
422 | if (status != EFI_SUCCESS) { |
423 | printk(KERN_WARNING "efivars: get_variable() failed 0x%lx!\n", | |
424 | status); | |
425 | } | |
426 | return status; | |
427 | } | |
428 | ||
68d92986 MG |
429 | static efi_status_t |
430 | check_var_size_locked(struct efivars *efivars, u32 attributes, | |
431 | unsigned long size) | |
432 | { | |
433 | u64 storage_size, remaining_size, max_size; | |
434 | efi_status_t status; | |
435 | const struct efivar_operations *fops = efivars->ops; | |
436 | ||
437 | if (!efivars->ops->query_variable_info) | |
438 | return EFI_UNSUPPORTED; | |
439 | ||
440 | status = fops->query_variable_info(attributes, &storage_size, | |
441 | &remaining_size, &max_size); | |
442 | ||
443 | if (status != EFI_SUCCESS) | |
444 | return status; | |
445 | ||
446 | if (!storage_size || size > remaining_size || size > max_size || | |
447 | (remaining_size - size) < (storage_size / 2)) | |
448 | return EFI_OUT_OF_RESOURCES; | |
449 | ||
450 | return status; | |
451 | } | |
452 | ||
453 | ||
454 | static efi_status_t | |
455 | check_var_size(struct efivars *efivars, u32 attributes, unsigned long size) | |
456 | { | |
457 | efi_status_t status; | |
458 | unsigned long flags; | |
459 | ||
460 | spin_lock_irqsave(&efivars->lock, flags); | |
461 | status = check_var_size_locked(efivars, attributes, size); | |
462 | spin_unlock_irqrestore(&efivars->lock, flags); | |
463 | ||
464 | return status; | |
465 | } | |
466 | ||
1da177e4 LT |
467 | static ssize_t |
468 | efivar_guid_read(struct efivar_entry *entry, char *buf) | |
469 | { | |
470 | struct efi_variable *var = &entry->var; | |
471 | char *str = buf; | |
472 | ||
473 | if (!entry || !buf) | |
474 | return 0; | |
475 | ||
476 | efi_guid_unparse(&var->VendorGuid, str); | |
477 | str += strlen(str); | |
478 | str += sprintf(str, "\n"); | |
479 | ||
480 | return str - buf; | |
481 | } | |
482 | ||
483 | static ssize_t | |
484 | efivar_attr_read(struct efivar_entry *entry, char *buf) | |
485 | { | |
486 | struct efi_variable *var = &entry->var; | |
487 | char *str = buf; | |
488 | efi_status_t status; | |
489 | ||
490 | if (!entry || !buf) | |
491 | return -EINVAL; | |
492 | ||
4142ef14 | 493 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
494 | if (status != EFI_SUCCESS) |
495 | return -EIO; | |
496 | ||
70839090 | 497 | if (var->Attributes & EFI_VARIABLE_NON_VOLATILE) |
1da177e4 | 498 | str += sprintf(str, "EFI_VARIABLE_NON_VOLATILE\n"); |
70839090 | 499 | if (var->Attributes & EFI_VARIABLE_BOOTSERVICE_ACCESS) |
1da177e4 | 500 | str += sprintf(str, "EFI_VARIABLE_BOOTSERVICE_ACCESS\n"); |
70839090 | 501 | if (var->Attributes & EFI_VARIABLE_RUNTIME_ACCESS) |
1da177e4 | 502 | str += sprintf(str, "EFI_VARIABLE_RUNTIME_ACCESS\n"); |
70839090 KA |
503 | if (var->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) |
504 | str += sprintf(str, "EFI_VARIABLE_HARDWARE_ERROR_RECORD\n"); | |
505 | if (var->Attributes & EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS) | |
506 | str += sprintf(str, | |
507 | "EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS\n"); | |
508 | if (var->Attributes & | |
509 | EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS) | |
510 | str += sprintf(str, | |
511 | "EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS\n"); | |
512 | if (var->Attributes & EFI_VARIABLE_APPEND_WRITE) | |
513 | str += sprintf(str, "EFI_VARIABLE_APPEND_WRITE\n"); | |
1da177e4 LT |
514 | return str - buf; |
515 | } | |
516 | ||
517 | static ssize_t | |
518 | efivar_size_read(struct efivar_entry *entry, char *buf) | |
519 | { | |
520 | struct efi_variable *var = &entry->var; | |
521 | char *str = buf; | |
522 | efi_status_t status; | |
523 | ||
524 | if (!entry || !buf) | |
525 | return -EINVAL; | |
526 | ||
4142ef14 | 527 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
528 | if (status != EFI_SUCCESS) |
529 | return -EIO; | |
530 | ||
531 | str += sprintf(str, "0x%lx\n", var->DataSize); | |
532 | return str - buf; | |
533 | } | |
534 | ||
535 | static ssize_t | |
536 | efivar_data_read(struct efivar_entry *entry, char *buf) | |
537 | { | |
538 | struct efi_variable *var = &entry->var; | |
539 | efi_status_t status; | |
540 | ||
541 | if (!entry || !buf) | |
542 | return -EINVAL; | |
543 | ||
4142ef14 | 544 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
545 | if (status != EFI_SUCCESS) |
546 | return -EIO; | |
547 | ||
548 | memcpy(buf, var->Data, var->DataSize); | |
549 | return var->DataSize; | |
550 | } | |
551 | /* | |
552 | * We allow each variable to be edited via rewriting the | |
553 | * entire efi variable structure. | |
554 | */ | |
555 | static ssize_t | |
556 | efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count) | |
557 | { | |
558 | struct efi_variable *new_var, *var = &entry->var; | |
4142ef14 | 559 | struct efivars *efivars = entry->efivars; |
1da177e4 LT |
560 | efi_status_t status = EFI_NOT_FOUND; |
561 | ||
562 | if (count != sizeof(struct efi_variable)) | |
563 | return -EINVAL; | |
564 | ||
565 | new_var = (struct efi_variable *)buf; | |
566 | /* | |
567 | * If only updating the variable data, then the name | |
568 | * and guid should remain the same | |
569 | */ | |
570 | if (memcmp(new_var->VariableName, var->VariableName, sizeof(var->VariableName)) || | |
571 | efi_guidcmp(new_var->VendorGuid, var->VendorGuid)) { | |
572 | printk(KERN_ERR "efivars: Cannot edit the wrong variable!\n"); | |
573 | return -EINVAL; | |
574 | } | |
575 | ||
576 | if ((new_var->DataSize <= 0) || (new_var->Attributes == 0)){ | |
577 | printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n"); | |
578 | return -EINVAL; | |
579 | } | |
580 | ||
fec6c20b MG |
581 | if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 || |
582 | validate_var(new_var, new_var->Data, new_var->DataSize) == false) { | |
583 | printk(KERN_ERR "efivars: Malformed variable content\n"); | |
584 | return -EINVAL; | |
585 | } | |
586 | ||
81fa4e58 | 587 | spin_lock_irq(&efivars->lock); |
68d92986 MG |
588 | |
589 | status = check_var_size_locked(efivars, new_var->Attributes, | |
590 | new_var->DataSize + utf16_strsize(new_var->VariableName, 1024)); | |
591 | ||
592 | if (status == EFI_SUCCESS || status == EFI_UNSUPPORTED) | |
593 | status = efivars->ops->set_variable(new_var->VariableName, | |
594 | &new_var->VendorGuid, | |
595 | new_var->Attributes, | |
596 | new_var->DataSize, | |
597 | new_var->Data); | |
1da177e4 | 598 | |
81fa4e58 | 599 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
600 | |
601 | if (status != EFI_SUCCESS) { | |
602 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
603 | status); | |
604 | return -EIO; | |
605 | } | |
606 | ||
607 | memcpy(&entry->var, new_var, count); | |
608 | return count; | |
609 | } | |
610 | ||
611 | static ssize_t | |
612 | efivar_show_raw(struct efivar_entry *entry, char *buf) | |
613 | { | |
614 | struct efi_variable *var = &entry->var; | |
615 | efi_status_t status; | |
616 | ||
617 | if (!entry || !buf) | |
618 | return 0; | |
619 | ||
4142ef14 | 620 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
621 | if (status != EFI_SUCCESS) |
622 | return -EIO; | |
623 | ||
624 | memcpy(buf, var, sizeof(*var)); | |
625 | return sizeof(*var); | |
626 | } | |
627 | ||
628 | /* | |
629 | * Generic read/write functions that call the specific functions of | |
70f23fd6 | 630 | * the attributes... |
1da177e4 LT |
631 | */ |
632 | static ssize_t efivar_attr_show(struct kobject *kobj, struct attribute *attr, | |
633 | char *buf) | |
634 | { | |
635 | struct efivar_entry *var = to_efivar_entry(kobj); | |
636 | struct efivar_attribute *efivar_attr = to_efivar_attr(attr); | |
70f2817a | 637 | ssize_t ret = -EIO; |
1da177e4 LT |
638 | |
639 | if (!capable(CAP_SYS_ADMIN)) | |
640 | return -EACCES; | |
641 | ||
642 | if (efivar_attr->show) { | |
643 | ret = efivar_attr->show(var, buf); | |
644 | } | |
645 | return ret; | |
646 | } | |
647 | ||
648 | static ssize_t efivar_attr_store(struct kobject *kobj, struct attribute *attr, | |
649 | const char *buf, size_t count) | |
650 | { | |
651 | struct efivar_entry *var = to_efivar_entry(kobj); | |
652 | struct efivar_attribute *efivar_attr = to_efivar_attr(attr); | |
70f2817a | 653 | ssize_t ret = -EIO; |
1da177e4 LT |
654 | |
655 | if (!capable(CAP_SYS_ADMIN)) | |
656 | return -EACCES; | |
657 | ||
658 | if (efivar_attr->store) | |
659 | ret = efivar_attr->store(var, buf, count); | |
660 | ||
661 | return ret; | |
662 | } | |
663 | ||
52cf25d0 | 664 | static const struct sysfs_ops efivar_attr_ops = { |
1da177e4 LT |
665 | .show = efivar_attr_show, |
666 | .store = efivar_attr_store, | |
667 | }; | |
668 | ||
669 | static void efivar_release(struct kobject *kobj) | |
670 | { | |
671 | struct efivar_entry *var = container_of(kobj, struct efivar_entry, kobj); | |
1da177e4 LT |
672 | kfree(var); |
673 | } | |
674 | ||
675 | static EFIVAR_ATTR(guid, 0400, efivar_guid_read, NULL); | |
676 | static EFIVAR_ATTR(attributes, 0400, efivar_attr_read, NULL); | |
677 | static EFIVAR_ATTR(size, 0400, efivar_size_read, NULL); | |
678 | static EFIVAR_ATTR(data, 0400, efivar_data_read, NULL); | |
679 | static EFIVAR_ATTR(raw_var, 0600, efivar_show_raw, efivar_store_raw); | |
680 | ||
681 | static struct attribute *def_attrs[] = { | |
682 | &efivar_attr_guid.attr, | |
683 | &efivar_attr_size.attr, | |
684 | &efivar_attr_attributes.attr, | |
685 | &efivar_attr_data.attr, | |
686 | &efivar_attr_raw_var.attr, | |
687 | NULL, | |
688 | }; | |
689 | ||
e89a4116 | 690 | static struct kobj_type efivar_ktype = { |
1da177e4 LT |
691 | .release = efivar_release, |
692 | .sysfs_ops = &efivar_attr_ops, | |
693 | .default_attrs = def_attrs, | |
694 | }; | |
695 | ||
1da177e4 LT |
696 | static inline void |
697 | efivar_unregister(struct efivar_entry *var) | |
698 | { | |
c10997f6 | 699 | kobject_put(&var->kobj); |
1da177e4 LT |
700 | } |
701 | ||
5d9db883 MG |
702 | static int efivarfs_file_open(struct inode *inode, struct file *file) |
703 | { | |
704 | file->private_data = inode->i_private; | |
705 | return 0; | |
706 | } | |
707 | ||
7253eaba MF |
708 | static int efi_status_to_err(efi_status_t status) |
709 | { | |
710 | int err; | |
711 | ||
712 | switch (status) { | |
713 | case EFI_INVALID_PARAMETER: | |
714 | err = -EINVAL; | |
715 | break; | |
716 | case EFI_OUT_OF_RESOURCES: | |
717 | err = -ENOSPC; | |
718 | break; | |
719 | case EFI_DEVICE_ERROR: | |
720 | err = -EIO; | |
721 | break; | |
722 | case EFI_WRITE_PROTECTED: | |
723 | err = -EROFS; | |
724 | break; | |
725 | case EFI_SECURITY_VIOLATION: | |
726 | err = -EACCES; | |
727 | break; | |
728 | case EFI_NOT_FOUND: | |
1fa7e695 | 729 | err = -EIO; |
7253eaba MF |
730 | break; |
731 | default: | |
732 | err = -EINVAL; | |
733 | } | |
734 | ||
735 | return err; | |
736 | } | |
737 | ||
5d9db883 MG |
738 | static ssize_t efivarfs_file_write(struct file *file, |
739 | const char __user *userbuf, size_t count, loff_t *ppos) | |
740 | { | |
741 | struct efivar_entry *var = file->private_data; | |
742 | struct efivars *efivars; | |
743 | efi_status_t status; | |
744 | void *data; | |
745 | u32 attributes; | |
746 | struct inode *inode = file->f_mapping->host; | |
07b1c5bc | 747 | unsigned long datasize = count - sizeof(attributes); |
68d92986 | 748 | unsigned long newdatasize, varsize; |
cfcf2f11 | 749 | ssize_t bytes = 0; |
5d9db883 MG |
750 | |
751 | if (count < sizeof(attributes)) | |
752 | return -EINVAL; | |
753 | ||
89d16665 MF |
754 | if (copy_from_user(&attributes, userbuf, sizeof(attributes))) |
755 | return -EFAULT; | |
5d9db883 | 756 | |
89d16665 MF |
757 | if (attributes & ~(EFI_VARIABLE_MASK)) |
758 | return -EINVAL; | |
5d9db883 MG |
759 | |
760 | efivars = var->efivars; | |
761 | ||
89d16665 MF |
762 | /* |
763 | * Ensure that the user can't allocate arbitrarily large | |
764 | * amounts of memory. Pick a default size of 64K if | |
765 | * QueryVariableInfo() isn't supported by the firmware. | |
766 | */ | |
89d16665 | 767 | |
68d92986 MG |
768 | varsize = datasize + utf16_strsize(var->var.VariableName, 1024); |
769 | status = check_var_size(efivars, attributes, varsize); | |
89d16665 MF |
770 | |
771 | if (status != EFI_SUCCESS) { | |
772 | if (status != EFI_UNSUPPORTED) | |
773 | return efi_status_to_err(status); | |
774 | ||
68d92986 MG |
775 | if (datasize > 65536) |
776 | return -ENOSPC; | |
5d9db883 MG |
777 | } |
778 | ||
89d16665 MF |
779 | data = kmalloc(datasize, GFP_KERNEL); |
780 | if (!data) | |
781 | return -ENOMEM; | |
782 | ||
5d9db883 | 783 | if (copy_from_user(data, userbuf + sizeof(attributes), datasize)) { |
cfcf2f11 | 784 | bytes = -EFAULT; |
5d9db883 MG |
785 | goto out; |
786 | } | |
787 | ||
788 | if (validate_var(&var->var, data, datasize) == false) { | |
cfcf2f11 | 789 | bytes = -EINVAL; |
5d9db883 MG |
790 | goto out; |
791 | } | |
792 | ||
f5f6a60a JK |
793 | /* |
794 | * The lock here protects the get_variable call, the conditional | |
795 | * set_variable call, and removal of the variable from the efivars | |
796 | * list (in the case of an authenticated delete). | |
797 | */ | |
81fa4e58 | 798 | spin_lock_irq(&efivars->lock); |
f5f6a60a | 799 | |
68d92986 MG |
800 | /* |
801 | * Ensure that the available space hasn't shrunk below the safe level | |
802 | */ | |
803 | ||
804 | status = check_var_size_locked(efivars, attributes, varsize); | |
805 | ||
806 | if (status != EFI_SUCCESS && status != EFI_UNSUPPORTED) { | |
807 | spin_unlock_irq(&efivars->lock); | |
808 | kfree(data); | |
809 | ||
810 | return efi_status_to_err(status); | |
811 | } | |
812 | ||
5d9db883 MG |
813 | status = efivars->ops->set_variable(var->var.VariableName, |
814 | &var->var.VendorGuid, | |
815 | attributes, datasize, | |
816 | data); | |
817 | ||
f5f6a60a | 818 | if (status != EFI_SUCCESS) { |
81fa4e58 | 819 | spin_unlock_irq(&efivars->lock); |
f5f6a60a JK |
820 | kfree(data); |
821 | ||
7253eaba | 822 | return efi_status_to_err(status); |
5d9db883 | 823 | } |
0c542edd | 824 | |
cfcf2f11 MF |
825 | bytes = count; |
826 | ||
0c542edd JK |
827 | /* |
828 | * Writing to the variable may have caused a change in size (which | |
829 | * could either be an append or an overwrite), or the variable to be | |
830 | * deleted. Perform a GetVariable() so we can tell what actually | |
831 | * happened. | |
832 | */ | |
833 | newdatasize = 0; | |
834 | status = efivars->ops->get_variable(var->var.VariableName, | |
835 | &var->var.VendorGuid, | |
836 | NULL, &newdatasize, | |
837 | NULL); | |
838 | ||
839 | if (status == EFI_BUFFER_TOO_SMALL) { | |
81fa4e58 | 840 | spin_unlock_irq(&efivars->lock); |
0c542edd JK |
841 | mutex_lock(&inode->i_mutex); |
842 | i_size_write(inode, newdatasize + sizeof(attributes)); | |
843 | mutex_unlock(&inode->i_mutex); | |
844 | ||
845 | } else if (status == EFI_NOT_FOUND) { | |
0c542edd | 846 | list_del(&var->list); |
81fa4e58 | 847 | spin_unlock_irq(&efivars->lock); |
0c542edd JK |
848 | efivar_unregister(var); |
849 | drop_nlink(inode); | |
791eb564 | 850 | d_delete(file->f_dentry); |
0c542edd JK |
851 | dput(file->f_dentry); |
852 | ||
853 | } else { | |
81fa4e58 | 854 | spin_unlock_irq(&efivars->lock); |
0c542edd JK |
855 | pr_warn("efivarfs: inconsistent EFI variable implementation? " |
856 | "status = %lx\n", status); | |
857 | } | |
858 | ||
5d9db883 MG |
859 | out: |
860 | kfree(data); | |
861 | ||
cfcf2f11 | 862 | return bytes; |
5d9db883 MG |
863 | } |
864 | ||
865 | static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf, | |
866 | size_t count, loff_t *ppos) | |
867 | { | |
868 | struct efivar_entry *var = file->private_data; | |
869 | struct efivars *efivars = var->efivars; | |
870 | efi_status_t status; | |
871 | unsigned long datasize = 0; | |
872 | u32 attributes; | |
873 | void *data; | |
d142df03 | 874 | ssize_t size = 0; |
5d9db883 | 875 | |
81fa4e58 | 876 | spin_lock_irq(&efivars->lock); |
5d9db883 MG |
877 | status = efivars->ops->get_variable(var->var.VariableName, |
878 | &var->var.VendorGuid, | |
879 | &attributes, &datasize, NULL); | |
81fa4e58 | 880 | spin_unlock_irq(&efivars->lock); |
5d9db883 MG |
881 | |
882 | if (status != EFI_BUFFER_TOO_SMALL) | |
7253eaba | 883 | return efi_status_to_err(status); |
5d9db883 | 884 | |
d2923841 | 885 | data = kmalloc(datasize + sizeof(attributes), GFP_KERNEL); |
5d9db883 MG |
886 | |
887 | if (!data) | |
7253eaba | 888 | return -ENOMEM; |
5d9db883 | 889 | |
81fa4e58 | 890 | spin_lock_irq(&efivars->lock); |
5d9db883 MG |
891 | status = efivars->ops->get_variable(var->var.VariableName, |
892 | &var->var.VendorGuid, | |
893 | &attributes, &datasize, | |
d2923841 | 894 | (data + sizeof(attributes))); |
81fa4e58 | 895 | spin_unlock_irq(&efivars->lock); |
f5f6a60a | 896 | |
7253eaba MF |
897 | if (status != EFI_SUCCESS) { |
898 | size = efi_status_to_err(status); | |
d142df03 | 899 | goto out_free; |
7253eaba | 900 | } |
5d9db883 | 901 | |
d2923841 | 902 | memcpy(data, &attributes, sizeof(attributes)); |
5d9db883 | 903 | size = simple_read_from_buffer(userbuf, count, ppos, |
d2923841 | 904 | data, datasize + sizeof(attributes)); |
d142df03 | 905 | out_free: |
5d9db883 MG |
906 | kfree(data); |
907 | ||
908 | return size; | |
909 | } | |
910 | ||
911 | static void efivarfs_evict_inode(struct inode *inode) | |
912 | { | |
913 | clear_inode(inode); | |
914 | } | |
915 | ||
916 | static const struct super_operations efivarfs_ops = { | |
917 | .statfs = simple_statfs, | |
918 | .drop_inode = generic_delete_inode, | |
919 | .evict_inode = efivarfs_evict_inode, | |
920 | .show_options = generic_show_options, | |
921 | }; | |
922 | ||
923 | static struct super_block *efivarfs_sb; | |
924 | ||
925 | static const struct inode_operations efivarfs_dir_inode_operations; | |
926 | ||
927 | static const struct file_operations efivarfs_file_operations = { | |
928 | .open = efivarfs_file_open, | |
929 | .read = efivarfs_file_read, | |
930 | .write = efivarfs_file_write, | |
931 | .llseek = no_llseek, | |
932 | }; | |
933 | ||
934 | static struct inode *efivarfs_get_inode(struct super_block *sb, | |
935 | const struct inode *dir, int mode, dev_t dev) | |
936 | { | |
937 | struct inode *inode = new_inode(sb); | |
938 | ||
939 | if (inode) { | |
940 | inode->i_ino = get_next_ino(); | |
5d9db883 MG |
941 | inode->i_mode = mode; |
942 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
943 | switch (mode & S_IFMT) { | |
944 | case S_IFREG: | |
945 | inode->i_fop = &efivarfs_file_operations; | |
946 | break; | |
947 | case S_IFDIR: | |
948 | inode->i_op = &efivarfs_dir_inode_operations; | |
949 | inode->i_fop = &simple_dir_operations; | |
950 | inc_nlink(inode); | |
951 | break; | |
952 | } | |
953 | } | |
954 | return inode; | |
955 | } | |
956 | ||
47f531e8 MF |
957 | /* |
958 | * Return true if 'str' is a valid efivarfs filename of the form, | |
959 | * | |
960 | * VariableName-12345678-1234-1234-1234-1234567891bc | |
961 | */ | |
962 | static bool efivarfs_valid_name(const char *str, int len) | |
963 | { | |
964 | static const char dashes[GUID_LEN] = { | |
965 | [8] = 1, [13] = 1, [18] = 1, [23] = 1 | |
966 | }; | |
967 | const char *s = str + len - GUID_LEN; | |
968 | int i; | |
969 | ||
970 | /* | |
971 | * We need a GUID, plus at least one letter for the variable name, | |
972 | * plus the '-' separator | |
973 | */ | |
974 | if (len < GUID_LEN + 2) | |
975 | return false; | |
976 | ||
123abd76 MF |
977 | /* GUID must be preceded by a '-' */ |
978 | if (*(s - 1) != '-') | |
47f531e8 MF |
979 | return false; |
980 | ||
981 | /* | |
982 | * Validate that 's' is of the correct format, e.g. | |
983 | * | |
984 | * 12345678-1234-1234-1234-123456789abc | |
985 | */ | |
986 | for (i = 0; i < GUID_LEN; i++) { | |
987 | if (dashes[i]) { | |
988 | if (*s++ != '-') | |
989 | return false; | |
990 | } else { | |
991 | if (!isxdigit(*s++)) | |
992 | return false; | |
993 | } | |
994 | } | |
995 | ||
996 | return true; | |
997 | } | |
998 | ||
5d9db883 MG |
999 | static void efivarfs_hex_to_guid(const char *str, efi_guid_t *guid) |
1000 | { | |
1001 | guid->b[0] = hex_to_bin(str[6]) << 4 | hex_to_bin(str[7]); | |
1002 | guid->b[1] = hex_to_bin(str[4]) << 4 | hex_to_bin(str[5]); | |
1003 | guid->b[2] = hex_to_bin(str[2]) << 4 | hex_to_bin(str[3]); | |
1004 | guid->b[3] = hex_to_bin(str[0]) << 4 | hex_to_bin(str[1]); | |
1005 | guid->b[4] = hex_to_bin(str[11]) << 4 | hex_to_bin(str[12]); | |
1006 | guid->b[5] = hex_to_bin(str[9]) << 4 | hex_to_bin(str[10]); | |
1007 | guid->b[6] = hex_to_bin(str[16]) << 4 | hex_to_bin(str[17]); | |
1008 | guid->b[7] = hex_to_bin(str[14]) << 4 | hex_to_bin(str[15]); | |
1009 | guid->b[8] = hex_to_bin(str[19]) << 4 | hex_to_bin(str[20]); | |
1010 | guid->b[9] = hex_to_bin(str[21]) << 4 | hex_to_bin(str[22]); | |
1011 | guid->b[10] = hex_to_bin(str[24]) << 4 | hex_to_bin(str[25]); | |
1012 | guid->b[11] = hex_to_bin(str[26]) << 4 | hex_to_bin(str[27]); | |
1013 | guid->b[12] = hex_to_bin(str[28]) << 4 | hex_to_bin(str[29]); | |
1014 | guid->b[13] = hex_to_bin(str[30]) << 4 | hex_to_bin(str[31]); | |
1015 | guid->b[14] = hex_to_bin(str[32]) << 4 | hex_to_bin(str[33]); | |
1016 | guid->b[15] = hex_to_bin(str[34]) << 4 | hex_to_bin(str[35]); | |
1017 | } | |
1018 | ||
1019 | static int efivarfs_create(struct inode *dir, struct dentry *dentry, | |
1020 | umode_t mode, bool excl) | |
1021 | { | |
45a937a8 | 1022 | struct inode *inode; |
5d9db883 MG |
1023 | struct efivars *efivars = &__efivars; |
1024 | struct efivar_entry *var; | |
1025 | int namelen, i = 0, err = 0; | |
1026 | ||
47f531e8 | 1027 | if (!efivarfs_valid_name(dentry->d_name.name, dentry->d_name.len)) |
5d9db883 MG |
1028 | return -EINVAL; |
1029 | ||
45a937a8 | 1030 | inode = efivarfs_get_inode(dir->i_sb, dir, mode, 0); |
5d9db883 | 1031 | if (!inode) |
aeeaa8d4 | 1032 | return -ENOMEM; |
5d9db883 MG |
1033 | |
1034 | var = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL); | |
45a937a8 AW |
1035 | if (!var) { |
1036 | err = -ENOMEM; | |
1037 | goto out; | |
1038 | } | |
5d9db883 | 1039 | |
310ad754 JK |
1040 | /* length of the variable name itself: remove GUID and separator */ |
1041 | namelen = dentry->d_name.len - GUID_LEN - 1; | |
5d9db883 MG |
1042 | |
1043 | efivarfs_hex_to_guid(dentry->d_name.name + namelen + 1, | |
1044 | &var->var.VendorGuid); | |
1045 | ||
1046 | for (i = 0; i < namelen; i++) | |
1047 | var->var.VariableName[i] = dentry->d_name.name[i]; | |
1048 | ||
1049 | var->var.VariableName[i] = '\0'; | |
1050 | ||
1051 | inode->i_private = var; | |
1052 | var->efivars = efivars; | |
1053 | var->kobj.kset = efivars->kset; | |
1054 | ||
1055 | err = kobject_init_and_add(&var->kobj, &efivar_ktype, NULL, "%s", | |
1056 | dentry->d_name.name); | |
1057 | if (err) | |
1058 | goto out; | |
1059 | ||
1060 | kobject_uevent(&var->kobj, KOBJ_ADD); | |
81fa4e58 | 1061 | spin_lock_irq(&efivars->lock); |
5d9db883 | 1062 | list_add(&var->list, &efivars->list); |
81fa4e58 | 1063 | spin_unlock_irq(&efivars->lock); |
5d9db883 MG |
1064 | d_instantiate(dentry, inode); |
1065 | dget(dentry); | |
1066 | out: | |
45a937a8 | 1067 | if (err) { |
5d9db883 | 1068 | kfree(var); |
45a937a8 AW |
1069 | iput(inode); |
1070 | } | |
5d9db883 MG |
1071 | return err; |
1072 | } | |
1073 | ||
1074 | static int efivarfs_unlink(struct inode *dir, struct dentry *dentry) | |
1075 | { | |
1076 | struct efivar_entry *var = dentry->d_inode->i_private; | |
1077 | struct efivars *efivars = var->efivars; | |
1078 | efi_status_t status; | |
1079 | ||
81fa4e58 | 1080 | spin_lock_irq(&efivars->lock); |
5d9db883 MG |
1081 | |
1082 | status = efivars->ops->set_variable(var->var.VariableName, | |
1083 | &var->var.VendorGuid, | |
1084 | 0, 0, NULL); | |
1085 | ||
1086 | if (status == EFI_SUCCESS || status == EFI_NOT_FOUND) { | |
1087 | list_del(&var->list); | |
81fa4e58 | 1088 | spin_unlock_irq(&efivars->lock); |
5d9db883 | 1089 | efivar_unregister(var); |
de5fe955 | 1090 | drop_nlink(dentry->d_inode); |
5d9db883 MG |
1091 | dput(dentry); |
1092 | return 0; | |
1093 | } | |
1094 | ||
81fa4e58 | 1095 | spin_unlock_irq(&efivars->lock); |
5d9db883 MG |
1096 | return -EINVAL; |
1097 | }; | |
1098 | ||
da27a243 MF |
1099 | /* |
1100 | * Compare two efivarfs file names. | |
1101 | * | |
1102 | * An efivarfs filename is composed of two parts, | |
1103 | * | |
1104 | * 1. A case-sensitive variable name | |
1105 | * 2. A case-insensitive GUID | |
1106 | * | |
1107 | * So we need to perform a case-sensitive match on part 1 and a | |
1108 | * case-insensitive match on part 2. | |
1109 | */ | |
1110 | static int efivarfs_d_compare(const struct dentry *parent, const struct inode *pinode, | |
1111 | const struct dentry *dentry, const struct inode *inode, | |
1112 | unsigned int len, const char *str, | |
1113 | const struct qstr *name) | |
1114 | { | |
1115 | int guid = len - GUID_LEN; | |
1116 | ||
1117 | if (name->len != len) | |
1118 | return 1; | |
1119 | ||
1120 | /* Case-sensitive compare for the variable name */ | |
1121 | if (memcmp(str, name->name, guid)) | |
1122 | return 1; | |
1123 | ||
1124 | /* Case-insensitive compare for the GUID */ | |
1125 | return strncasecmp(name->name + guid, str + guid, GUID_LEN); | |
1126 | } | |
1127 | ||
1128 | static int efivarfs_d_hash(const struct dentry *dentry, | |
1129 | const struct inode *inode, struct qstr *qstr) | |
1130 | { | |
1131 | unsigned long hash = init_name_hash(); | |
1132 | const unsigned char *s = qstr->name; | |
1133 | unsigned int len = qstr->len; | |
1134 | ||
1135 | if (!efivarfs_valid_name(s, len)) | |
1136 | return -EINVAL; | |
1137 | ||
1138 | while (len-- > GUID_LEN) | |
1139 | hash = partial_name_hash(*s++, hash); | |
1140 | ||
1141 | /* GUID is case-insensitive. */ | |
1142 | while (len--) | |
1143 | hash = partial_name_hash(tolower(*s++), hash); | |
1144 | ||
1145 | qstr->hash = end_name_hash(hash); | |
1146 | return 0; | |
1147 | } | |
1148 | ||
1149 | /* | |
1150 | * Retaining negative dentries for an in-memory filesystem just wastes | |
1151 | * memory and lookup time: arrange for them to be deleted immediately. | |
1152 | */ | |
1153 | static int efivarfs_delete_dentry(const struct dentry *dentry) | |
1154 | { | |
1155 | return 1; | |
1156 | } | |
1157 | ||
1158 | static struct dentry_operations efivarfs_d_ops = { | |
1159 | .d_compare = efivarfs_d_compare, | |
1160 | .d_hash = efivarfs_d_hash, | |
1161 | .d_delete = efivarfs_delete_dentry, | |
1162 | }; | |
1163 | ||
1164 | static struct dentry *efivarfs_alloc_dentry(struct dentry *parent, char *name) | |
1165 | { | |
feff5dc4 | 1166 | struct dentry *d; |
da27a243 | 1167 | struct qstr q; |
feff5dc4 | 1168 | int err; |
da27a243 MF |
1169 | |
1170 | q.name = name; | |
1171 | q.len = strlen(name); | |
1172 | ||
feff5dc4 MF |
1173 | err = efivarfs_d_hash(NULL, NULL, &q); |
1174 | if (err) | |
1175 | return ERR_PTR(err); | |
1176 | ||
1177 | d = d_alloc(parent, &q); | |
1178 | if (d) | |
1179 | return d; | |
da27a243 | 1180 | |
feff5dc4 | 1181 | return ERR_PTR(-ENOMEM); |
da27a243 MF |
1182 | } |
1183 | ||
e83af1f1 | 1184 | static int efivarfs_fill_super(struct super_block *sb, void *data, int silent) |
5d9db883 MG |
1185 | { |
1186 | struct inode *inode = NULL; | |
1187 | struct dentry *root; | |
1188 | struct efivar_entry *entry, *n; | |
1189 | struct efivars *efivars = &__efivars; | |
5ba6e291 | 1190 | char *name; |
feff5dc4 | 1191 | int err = -ENOMEM; |
5d9db883 MG |
1192 | |
1193 | efivarfs_sb = sb; | |
1194 | ||
1195 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
1196 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
1197 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
91716322 | 1198 | sb->s_magic = EFIVARFS_MAGIC; |
5d9db883 | 1199 | sb->s_op = &efivarfs_ops; |
da27a243 | 1200 | sb->s_d_op = &efivarfs_d_ops; |
5d9db883 MG |
1201 | sb->s_time_gran = 1; |
1202 | ||
1203 | inode = efivarfs_get_inode(sb, NULL, S_IFDIR | 0755, 0); | |
5c9b50ab AW |
1204 | if (!inode) |
1205 | return -ENOMEM; | |
5d9db883 MG |
1206 | inode->i_op = &efivarfs_dir_inode_operations; |
1207 | ||
1208 | root = d_make_root(inode); | |
1209 | sb->s_root = root; | |
5c9b50ab AW |
1210 | if (!root) |
1211 | return -ENOMEM; | |
5d9db883 MG |
1212 | |
1213 | list_for_each_entry_safe(entry, n, &efivars->list, list) { | |
5d9db883 | 1214 | struct dentry *dentry, *root = efivarfs_sb->s_root; |
5d9db883 MG |
1215 | unsigned long size = 0; |
1216 | int len, i; | |
1217 | ||
5ba6e291 AW |
1218 | inode = NULL; |
1219 | ||
5d9db883 MG |
1220 | len = utf16_strlen(entry->var.VariableName); |
1221 | ||
310ad754 JK |
1222 | /* name, plus '-', plus GUID, plus NUL*/ |
1223 | name = kmalloc(len + 1 + GUID_LEN + 1, GFP_ATOMIC); | |
5ba6e291 AW |
1224 | if (!name) |
1225 | goto fail; | |
5d9db883 MG |
1226 | |
1227 | for (i = 0; i < len; i++) | |
1228 | name[i] = entry->var.VariableName[i] & 0xFF; | |
1229 | ||
1230 | name[len] = '-'; | |
1231 | ||
1232 | efi_guid_unparse(&entry->var.VendorGuid, name + len + 1); | |
1233 | ||
310ad754 | 1234 | name[len+GUID_LEN+1] = '\0'; |
5d9db883 MG |
1235 | |
1236 | inode = efivarfs_get_inode(efivarfs_sb, root->d_inode, | |
1237 | S_IFREG | 0644, 0); | |
5ba6e291 AW |
1238 | if (!inode) |
1239 | goto fail_name; | |
1240 | ||
da27a243 | 1241 | dentry = efivarfs_alloc_dentry(root, name); |
feff5dc4 MF |
1242 | if (IS_ERR(dentry)) { |
1243 | err = PTR_ERR(dentry); | |
5ba6e291 | 1244 | goto fail_inode; |
feff5dc4 | 1245 | } |
5ba6e291 | 1246 | |
c0359db1 AW |
1247 | /* copied by the above to local storage in the dentry. */ |
1248 | kfree(name); | |
5d9db883 | 1249 | |
81fa4e58 | 1250 | spin_lock_irq(&efivars->lock); |
5d9db883 MG |
1251 | efivars->ops->get_variable(entry->var.VariableName, |
1252 | &entry->var.VendorGuid, | |
1253 | &entry->var.Attributes, | |
1254 | &size, | |
1255 | NULL); | |
81fa4e58 | 1256 | spin_unlock_irq(&efivars->lock); |
5d9db883 MG |
1257 | |
1258 | mutex_lock(&inode->i_mutex); | |
1259 | inode->i_private = entry; | |
94a193fb | 1260 | i_size_write(inode, size + sizeof(entry->var.Attributes)); |
5d9db883 MG |
1261 | mutex_unlock(&inode->i_mutex); |
1262 | d_add(dentry, inode); | |
1263 | } | |
1264 | ||
1265 | return 0; | |
5ba6e291 AW |
1266 | |
1267 | fail_inode: | |
1268 | iput(inode); | |
1269 | fail_name: | |
1270 | kfree(name); | |
1271 | fail: | |
feff5dc4 | 1272 | return err; |
5d9db883 MG |
1273 | } |
1274 | ||
1275 | static struct dentry *efivarfs_mount(struct file_system_type *fs_type, | |
1276 | int flags, const char *dev_name, void *data) | |
1277 | { | |
1278 | return mount_single(fs_type, flags, data, efivarfs_fill_super); | |
1279 | } | |
1280 | ||
1281 | static void efivarfs_kill_sb(struct super_block *sb) | |
1282 | { | |
1283 | kill_litter_super(sb); | |
1284 | efivarfs_sb = NULL; | |
1285 | } | |
1286 | ||
1287 | static struct file_system_type efivarfs_type = { | |
1288 | .name = "efivarfs", | |
1289 | .mount = efivarfs_mount, | |
1290 | .kill_sb = efivarfs_kill_sb, | |
1291 | }; | |
7f78e035 | 1292 | MODULE_ALIAS_FS("efivarfs"); |
5d9db883 | 1293 | |
da27a243 MF |
1294 | /* |
1295 | * Handle negative dentry. | |
1296 | */ | |
1297 | static struct dentry *efivarfs_lookup(struct inode *dir, struct dentry *dentry, | |
1298 | unsigned int flags) | |
1299 | { | |
1300 | if (dentry->d_name.len > NAME_MAX) | |
1301 | return ERR_PTR(-ENAMETOOLONG); | |
1302 | d_add(dentry, NULL); | |
1303 | return NULL; | |
1304 | } | |
1305 | ||
5d9db883 | 1306 | static const struct inode_operations efivarfs_dir_inode_operations = { |
da27a243 | 1307 | .lookup = efivarfs_lookup, |
5d9db883 MG |
1308 | .unlink = efivarfs_unlink, |
1309 | .create = efivarfs_create, | |
1310 | }; | |
1311 | ||
1312 | static struct pstore_info efi_pstore_info; | |
1313 | ||
5ee9c198 MG |
1314 | #ifdef CONFIG_PSTORE |
1315 | ||
1316 | static int efi_pstore_open(struct pstore_info *psi) | |
1317 | { | |
1318 | struct efivars *efivars = psi->data; | |
1319 | ||
81fa4e58 | 1320 | spin_lock_irq(&efivars->lock); |
5ee9c198 MG |
1321 | efivars->walk_entry = list_first_entry(&efivars->list, |
1322 | struct efivar_entry, list); | |
1323 | return 0; | |
1324 | } | |
1325 | ||
1326 | static int efi_pstore_close(struct pstore_info *psi) | |
1327 | { | |
1328 | struct efivars *efivars = psi->data; | |
1329 | ||
81fa4e58 | 1330 | spin_unlock_irq(&efivars->lock); |
5ee9c198 MG |
1331 | return 0; |
1332 | } | |
1333 | ||
1334 | static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, | |
755d4fe4 | 1335 | int *count, struct timespec *timespec, |
f6f82851 | 1336 | char **buf, struct pstore_info *psi) |
5ee9c198 MG |
1337 | { |
1338 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; | |
1339 | struct efivars *efivars = psi->data; | |
1340 | char name[DUMP_NAME_LEN]; | |
1341 | int i; | |
755d4fe4 | 1342 | int cnt; |
5ee9c198 MG |
1343 | unsigned int part, size; |
1344 | unsigned long time; | |
1345 | ||
1346 | while (&efivars->walk_entry->list != &efivars->list) { | |
1347 | if (!efi_guidcmp(efivars->walk_entry->var.VendorGuid, | |
1348 | vendor)) { | |
1349 | for (i = 0; i < DUMP_NAME_LEN; i++) { | |
1350 | name[i] = efivars->walk_entry->var.VariableName[i]; | |
1351 | } | |
755d4fe4 SA |
1352 | if (sscanf(name, "dump-type%u-%u-%d-%lu", |
1353 | type, &part, &cnt, &time) == 4) { | |
5ee9c198 | 1354 | *id = part; |
755d4fe4 | 1355 | *count = cnt; |
5ee9c198 MG |
1356 | timespec->tv_sec = time; |
1357 | timespec->tv_nsec = 0; | |
0f7de85a SA |
1358 | } else if (sscanf(name, "dump-type%u-%u-%lu", |
1359 | type, &part, &time) == 3) { | |
1360 | /* | |
1361 | * Check if an old format, | |
1362 | * which doesn't support holding | |
1363 | * multiple logs, remains. | |
1364 | */ | |
1365 | *id = part; | |
1366 | *count = 0; | |
1367 | timespec->tv_sec = time; | |
1368 | timespec->tv_nsec = 0; | |
1369 | } else { | |
1370 | efivars->walk_entry = list_entry( | |
1371 | efivars->walk_entry->list.next, | |
1372 | struct efivar_entry, list); | |
1373 | continue; | |
5ee9c198 | 1374 | } |
0f7de85a SA |
1375 | |
1376 | get_var_data_locked(efivars, &efivars->walk_entry->var); | |
1377 | size = efivars->walk_entry->var.DataSize; | |
1378 | *buf = kmalloc(size, GFP_KERNEL); | |
1379 | if (*buf == NULL) | |
1380 | return -ENOMEM; | |
1381 | memcpy(*buf, efivars->walk_entry->var.Data, | |
1382 | size); | |
1383 | efivars->walk_entry = list_entry( | |
1384 | efivars->walk_entry->list.next, | |
1385 | struct efivar_entry, list); | |
1386 | return size; | |
5ee9c198 MG |
1387 | } |
1388 | efivars->walk_entry = list_entry(efivars->walk_entry->list.next, | |
1389 | struct efivar_entry, list); | |
1390 | } | |
1391 | return 0; | |
1392 | } | |
1393 | ||
3d6d8d20 KC |
1394 | static int efi_pstore_write(enum pstore_type_id type, |
1395 | enum kmsg_dump_reason reason, u64 *id, | |
755d4fe4 SA |
1396 | unsigned int part, int count, size_t size, |
1397 | struct pstore_info *psi) | |
5ee9c198 MG |
1398 | { |
1399 | char name[DUMP_NAME_LEN]; | |
5ee9c198 MG |
1400 | efi_char16_t efi_name[DUMP_NAME_LEN]; |
1401 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; | |
1402 | struct efivars *efivars = psi->data; | |
b238b8fa | 1403 | int i, ret = 0; |
d80a361d | 1404 | efi_status_t status = EFI_NOT_FOUND; |
81fa4e58 | 1405 | unsigned long flags; |
5ee9c198 | 1406 | |
e59310ad SA |
1407 | if (pstore_cannot_block_path(reason)) { |
1408 | /* | |
1409 | * If the lock is taken by another cpu in non-blocking path, | |
1410 | * this driver returns without entering firmware to avoid | |
1411 | * hanging up. | |
1412 | */ | |
81fa4e58 | 1413 | if (!spin_trylock_irqsave(&efivars->lock, flags)) |
e59310ad SA |
1414 | return -EBUSY; |
1415 | } else | |
81fa4e58 | 1416 | spin_lock_irqsave(&efivars->lock, flags); |
5ee9c198 | 1417 | |
d80a361d SA |
1418 | /* |
1419 | * Check if there is a space enough to log. | |
1420 | * size: a size of logging data | |
1421 | * DUMP_NAME_LEN * 2: a maximum size of variable name | |
1422 | */ | |
68d92986 MG |
1423 | |
1424 | status = check_var_size_locked(efivars, PSTORE_EFI_ATTRIBUTES, | |
1425 | size + DUMP_NAME_LEN * 2); | |
1426 | ||
1427 | if (status) { | |
81fa4e58 | 1428 | spin_unlock_irqrestore(&efivars->lock, flags); |
d80a361d SA |
1429 | *id = part; |
1430 | return -ENOSPC; | |
1431 | } | |
1432 | ||
755d4fe4 | 1433 | sprintf(name, "dump-type%u-%u-%d-%lu", type, part, count, |
96480d9c | 1434 | get_seconds()); |
5ee9c198 MG |
1435 | |
1436 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
1437 | efi_name[i] = name[i]; | |
1438 | ||
7644c16c | 1439 | efivars->ops->set_variable(efi_name, &vendor, PSTORE_EFI_ATTRIBUTES, |
5ee9c198 MG |
1440 | size, psi->buf); |
1441 | ||
81fa4e58 | 1442 | spin_unlock_irqrestore(&efivars->lock, flags); |
5ee9c198 | 1443 | |
a93bc0c6 SA |
1444 | if (reason == KMSG_DUMP_OOPS) |
1445 | schedule_work(&efivar_work); | |
5ee9c198 | 1446 | |
b238b8fa CG |
1447 | *id = part; |
1448 | return ret; | |
5ee9c198 MG |
1449 | }; |
1450 | ||
755d4fe4 | 1451 | static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count, |
a9efd39c | 1452 | struct timespec time, struct pstore_info *psi) |
5ee9c198 | 1453 | { |
a9efd39c | 1454 | char name[DUMP_NAME_LEN]; |
dd230fec | 1455 | efi_char16_t efi_name[DUMP_NAME_LEN]; |
f94ec0c0 SA |
1456 | char name_old[DUMP_NAME_LEN]; |
1457 | efi_char16_t efi_name_old[DUMP_NAME_LEN]; | |
dd230fec SA |
1458 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; |
1459 | struct efivars *efivars = psi->data; | |
1460 | struct efivar_entry *entry, *found = NULL; | |
1461 | int i; | |
1462 | ||
755d4fe4 | 1463 | sprintf(name, "dump-type%u-%u-%d-%lu", type, (unsigned int)id, count, |
a9efd39c | 1464 | time.tv_sec); |
dd230fec | 1465 | |
81fa4e58 | 1466 | spin_lock_irq(&efivars->lock); |
dd230fec SA |
1467 | |
1468 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
a9efd39c | 1469 | efi_name[i] = name[i]; |
dd230fec SA |
1470 | |
1471 | /* | |
a9efd39c | 1472 | * Clean up an entry with the same name |
dd230fec SA |
1473 | */ |
1474 | ||
1475 | list_for_each_entry(entry, &efivars->list, list) { | |
1476 | get_var_data_locked(efivars, &entry->var); | |
1477 | ||
1478 | if (efi_guidcmp(entry->var.VendorGuid, vendor)) | |
1479 | continue; | |
1480 | if (utf16_strncmp(entry->var.VariableName, efi_name, | |
f94ec0c0 SA |
1481 | utf16_strlen(efi_name))) { |
1482 | /* | |
1483 | * Check if an old format, | |
1484 | * which doesn't support holding | |
1485 | * multiple logs, remains. | |
1486 | */ | |
1487 | sprintf(name_old, "dump-type%u-%u-%lu", type, | |
1488 | (unsigned int)id, time.tv_sec); | |
1489 | ||
1490 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
1491 | efi_name_old[i] = name_old[i]; | |
1492 | ||
1493 | if (utf16_strncmp(entry->var.VariableName, efi_name_old, | |
1494 | utf16_strlen(efi_name_old))) | |
1495 | continue; | |
1496 | } | |
dd230fec SA |
1497 | |
1498 | /* found */ | |
1499 | found = entry; | |
1500 | efivars->ops->set_variable(entry->var.VariableName, | |
1501 | &entry->var.VendorGuid, | |
1502 | PSTORE_EFI_ATTRIBUTES, | |
1503 | 0, NULL); | |
a9efd39c | 1504 | break; |
dd230fec SA |
1505 | } |
1506 | ||
1507 | if (found) | |
1508 | list_del(&found->list); | |
1509 | ||
81fa4e58 | 1510 | spin_unlock_irq(&efivars->lock); |
dd230fec SA |
1511 | |
1512 | if (found) | |
1513 | efivar_unregister(found); | |
5ee9c198 MG |
1514 | |
1515 | return 0; | |
1516 | } | |
1517 | #else | |
1518 | static int efi_pstore_open(struct pstore_info *psi) | |
1519 | { | |
1520 | return 0; | |
1521 | } | |
1522 | ||
1523 | static int efi_pstore_close(struct pstore_info *psi) | |
1524 | { | |
1525 | return 0; | |
1526 | } | |
1527 | ||
755d4fe4 | 1528 | static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, int *count, |
eee628da CF |
1529 | struct timespec *timespec, |
1530 | char **buf, struct pstore_info *psi) | |
5ee9c198 MG |
1531 | { |
1532 | return -1; | |
1533 | } | |
1534 | ||
3d6d8d20 KC |
1535 | static int efi_pstore_write(enum pstore_type_id type, |
1536 | enum kmsg_dump_reason reason, u64 *id, | |
755d4fe4 SA |
1537 | unsigned int part, int count, size_t size, |
1538 | struct pstore_info *psi) | |
5ee9c198 MG |
1539 | { |
1540 | return 0; | |
1541 | } | |
1542 | ||
755d4fe4 | 1543 | static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count, |
a9efd39c | 1544 | struct timespec time, struct pstore_info *psi) |
5ee9c198 MG |
1545 | { |
1546 | return 0; | |
1547 | } | |
1548 | #endif | |
1549 | ||
1550 | static struct pstore_info efi_pstore_info = { | |
1551 | .owner = THIS_MODULE, | |
1552 | .name = "efi", | |
1553 | .open = efi_pstore_open, | |
1554 | .close = efi_pstore_close, | |
1555 | .read = efi_pstore_read, | |
1556 | .write = efi_pstore_write, | |
1557 | .erase = efi_pstore_erase, | |
1558 | }; | |
1da177e4 | 1559 | |
2c3c8bea | 1560 | static ssize_t efivar_create(struct file *filp, struct kobject *kobj, |
97fa5bb7 GKH |
1561 | struct bin_attribute *bin_attr, |
1562 | char *buf, loff_t pos, size_t count) | |
1da177e4 LT |
1563 | { |
1564 | struct efi_variable *new_var = (struct efi_variable *)buf; | |
4142ef14 | 1565 | struct efivars *efivars = bin_attr->private; |
496a0fc8 | 1566 | struct efivar_entry *search_efivar, *n; |
1da177e4 | 1567 | unsigned long strsize1, strsize2; |
1da177e4 LT |
1568 | efi_status_t status = EFI_NOT_FOUND; |
1569 | int found = 0; | |
1570 | ||
1571 | if (!capable(CAP_SYS_ADMIN)) | |
1572 | return -EACCES; | |
1573 | ||
fec6c20b MG |
1574 | if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 || |
1575 | validate_var(new_var, new_var->Data, new_var->DataSize) == false) { | |
1576 | printk(KERN_ERR "efivars: Malformed variable content\n"); | |
1577 | return -EINVAL; | |
1578 | } | |
1579 | ||
81fa4e58 | 1580 | spin_lock_irq(&efivars->lock); |
1da177e4 LT |
1581 | |
1582 | /* | |
1583 | * Does this variable already exist? | |
1584 | */ | |
29422693 | 1585 | list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
a2940908 MW |
1586 | strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); |
1587 | strsize2 = utf16_strsize(new_var->VariableName, 1024); | |
1da177e4 LT |
1588 | if (strsize1 == strsize2 && |
1589 | !memcmp(&(search_efivar->var.VariableName), | |
1590 | new_var->VariableName, strsize1) && | |
1591 | !efi_guidcmp(search_efivar->var.VendorGuid, | |
1592 | new_var->VendorGuid)) { | |
1593 | found = 1; | |
1594 | break; | |
1595 | } | |
1596 | } | |
1597 | if (found) { | |
81fa4e58 | 1598 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1599 | return -EINVAL; |
1600 | } | |
1601 | ||
68d92986 MG |
1602 | status = check_var_size_locked(efivars, new_var->Attributes, |
1603 | new_var->DataSize + utf16_strsize(new_var->VariableName, 1024)); | |
1604 | ||
1605 | if (status && status != EFI_UNSUPPORTED) { | |
1606 | spin_unlock_irq(&efivars->lock); | |
1607 | return efi_status_to_err(status); | |
1608 | } | |
1609 | ||
1da177e4 | 1610 | /* now *really* create the variable via EFI */ |
3295814d MW |
1611 | status = efivars->ops->set_variable(new_var->VariableName, |
1612 | &new_var->VendorGuid, | |
1613 | new_var->Attributes, | |
1614 | new_var->DataSize, | |
1615 | new_var->Data); | |
1da177e4 LT |
1616 | |
1617 | if (status != EFI_SUCCESS) { | |
1618 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
1619 | status); | |
81fa4e58 | 1620 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1621 | return -EIO; |
1622 | } | |
81fa4e58 | 1623 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1624 | |
1625 | /* Create the entry in sysfs. Locking is not required here */ | |
4142ef14 | 1626 | status = efivar_create_sysfs_entry(efivars, |
a2940908 MW |
1627 | utf16_strsize(new_var->VariableName, |
1628 | 1024), | |
4142ef14 MW |
1629 | new_var->VariableName, |
1630 | &new_var->VendorGuid); | |
1da177e4 LT |
1631 | if (status) { |
1632 | printk(KERN_WARNING "efivars: variable created, but sysfs entry wasn't.\n"); | |
1633 | } | |
1634 | return count; | |
1635 | } | |
1636 | ||
2c3c8bea | 1637 | static ssize_t efivar_delete(struct file *filp, struct kobject *kobj, |
97fa5bb7 GKH |
1638 | struct bin_attribute *bin_attr, |
1639 | char *buf, loff_t pos, size_t count) | |
1da177e4 LT |
1640 | { |
1641 | struct efi_variable *del_var = (struct efi_variable *)buf; | |
4142ef14 | 1642 | struct efivars *efivars = bin_attr->private; |
496a0fc8 | 1643 | struct efivar_entry *search_efivar, *n; |
1da177e4 | 1644 | unsigned long strsize1, strsize2; |
1da177e4 LT |
1645 | efi_status_t status = EFI_NOT_FOUND; |
1646 | int found = 0; | |
1647 | ||
1648 | if (!capable(CAP_SYS_ADMIN)) | |
1649 | return -EACCES; | |
1650 | ||
81fa4e58 | 1651 | spin_lock_irq(&efivars->lock); |
1da177e4 LT |
1652 | |
1653 | /* | |
1654 | * Does this variable already exist? | |
1655 | */ | |
29422693 | 1656 | list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
a2940908 MW |
1657 | strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); |
1658 | strsize2 = utf16_strsize(del_var->VariableName, 1024); | |
1da177e4 LT |
1659 | if (strsize1 == strsize2 && |
1660 | !memcmp(&(search_efivar->var.VariableName), | |
1661 | del_var->VariableName, strsize1) && | |
1662 | !efi_guidcmp(search_efivar->var.VendorGuid, | |
1663 | del_var->VendorGuid)) { | |
1664 | found = 1; | |
1665 | break; | |
1666 | } | |
1667 | } | |
1668 | if (!found) { | |
81fa4e58 | 1669 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1670 | return -EINVAL; |
1671 | } | |
1672 | /* force the Attributes/DataSize to 0 to ensure deletion */ | |
1673 | del_var->Attributes = 0; | |
1674 | del_var->DataSize = 0; | |
1675 | ||
3295814d MW |
1676 | status = efivars->ops->set_variable(del_var->VariableName, |
1677 | &del_var->VendorGuid, | |
1678 | del_var->Attributes, | |
1679 | del_var->DataSize, | |
1680 | del_var->Data); | |
1da177e4 LT |
1681 | |
1682 | if (status != EFI_SUCCESS) { | |
1683 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
1684 | status); | |
81fa4e58 | 1685 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1686 | return -EIO; |
1687 | } | |
496a0fc8 | 1688 | list_del(&search_efivar->list); |
1da177e4 | 1689 | /* We need to release this lock before unregistering. */ |
81fa4e58 | 1690 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1691 | efivar_unregister(search_efivar); |
1692 | ||
1693 | /* It's dead Jim.... */ | |
1694 | return count; | |
1695 | } | |
1696 | ||
a93bc0c6 SA |
1697 | static bool variable_is_present(efi_char16_t *variable_name, efi_guid_t *vendor) |
1698 | { | |
1699 | struct efivar_entry *entry, *n; | |
1700 | struct efivars *efivars = &__efivars; | |
1701 | unsigned long strsize1, strsize2; | |
1702 | bool found = false; | |
1703 | ||
1704 | strsize1 = utf16_strsize(variable_name, 1024); | |
1705 | list_for_each_entry_safe(entry, n, &efivars->list, list) { | |
1706 | strsize2 = utf16_strsize(entry->var.VariableName, 1024); | |
1707 | if (strsize1 == strsize2 && | |
1708 | !memcmp(variable_name, &(entry->var.VariableName), | |
1709 | strsize2) && | |
1710 | !efi_guidcmp(entry->var.VendorGuid, | |
1711 | *vendor)) { | |
1712 | found = true; | |
1713 | break; | |
1714 | } | |
1715 | } | |
1716 | return found; | |
1717 | } | |
1718 | ||
1719 | static void efivar_update_sysfs_entries(struct work_struct *work) | |
1720 | { | |
1721 | struct efivars *efivars = &__efivars; | |
1722 | efi_guid_t vendor; | |
1723 | efi_char16_t *variable_name; | |
1724 | unsigned long variable_name_size = 1024; | |
1725 | efi_status_t status = EFI_NOT_FOUND; | |
1726 | bool found; | |
1727 | ||
1728 | /* Add new sysfs entries */ | |
1729 | while (1) { | |
1730 | variable_name = kzalloc(variable_name_size, GFP_KERNEL); | |
1731 | if (!variable_name) { | |
1732 | pr_err("efivars: Memory allocation failed.\n"); | |
1733 | return; | |
1734 | } | |
1735 | ||
1736 | spin_lock_irq(&efivars->lock); | |
1737 | found = false; | |
1738 | while (1) { | |
1739 | variable_name_size = 1024; | |
1740 | status = efivars->ops->get_next_variable( | |
1741 | &variable_name_size, | |
1742 | variable_name, | |
1743 | &vendor); | |
1744 | if (status != EFI_SUCCESS) { | |
1745 | break; | |
1746 | } else { | |
1747 | if (!variable_is_present(variable_name, | |
1748 | &vendor)) { | |
1749 | found = true; | |
1750 | break; | |
1751 | } | |
1752 | } | |
1753 | } | |
1754 | spin_unlock_irq(&efivars->lock); | |
1755 | ||
1756 | if (!found) { | |
1757 | kfree(variable_name); | |
1758 | break; | |
1759 | } else | |
1760 | efivar_create_sysfs_entry(efivars, | |
1761 | variable_name_size, | |
1762 | variable_name, &vendor); | |
1763 | } | |
1764 | } | |
1765 | ||
1da177e4 LT |
1766 | /* |
1767 | * Let's not leave out systab information that snuck into | |
1768 | * the efivars driver | |
1769 | */ | |
334c6307 GKH |
1770 | static ssize_t systab_show(struct kobject *kobj, |
1771 | struct kobj_attribute *attr, char *buf) | |
1da177e4 LT |
1772 | { |
1773 | char *str = buf; | |
1774 | ||
334c6307 | 1775 | if (!kobj || !buf) |
1da177e4 LT |
1776 | return -EINVAL; |
1777 | ||
b2c99e3c BH |
1778 | if (efi.mps != EFI_INVALID_TABLE_ADDR) |
1779 | str += sprintf(str, "MPS=0x%lx\n", efi.mps); | |
1780 | if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) | |
1781 | str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20); | |
1782 | if (efi.acpi != EFI_INVALID_TABLE_ADDR) | |
1783 | str += sprintf(str, "ACPI=0x%lx\n", efi.acpi); | |
1784 | if (efi.smbios != EFI_INVALID_TABLE_ADDR) | |
1785 | str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios); | |
1786 | if (efi.hcdp != EFI_INVALID_TABLE_ADDR) | |
1787 | str += sprintf(str, "HCDP=0x%lx\n", efi.hcdp); | |
1788 | if (efi.boot_info != EFI_INVALID_TABLE_ADDR) | |
1789 | str += sprintf(str, "BOOTINFO=0x%lx\n", efi.boot_info); | |
1790 | if (efi.uga != EFI_INVALID_TABLE_ADDR) | |
1791 | str += sprintf(str, "UGA=0x%lx\n", efi.uga); | |
1da177e4 LT |
1792 | |
1793 | return str - buf; | |
1794 | } | |
1795 | ||
334c6307 GKH |
1796 | static struct kobj_attribute efi_attr_systab = |
1797 | __ATTR(systab, 0400, systab_show, NULL); | |
1da177e4 | 1798 | |
334c6307 GKH |
1799 | static struct attribute *efi_subsys_attrs[] = { |
1800 | &efi_attr_systab.attr, | |
1da177e4 LT |
1801 | NULL, /* maybe more in the future? */ |
1802 | }; | |
1803 | ||
334c6307 GKH |
1804 | static struct attribute_group efi_subsys_attr_group = { |
1805 | .attrs = efi_subsys_attrs, | |
1806 | }; | |
1807 | ||
bc87d2fe | 1808 | static struct kobject *efi_kobj; |
1da177e4 LT |
1809 | |
1810 | /* | |
1811 | * efivar_create_sysfs_entry() | |
1812 | * Requires: | |
1813 | * variable_name_size = number of bytes required to hold | |
1814 | * variable_name (not counting the NULL | |
1815 | * character at the end. | |
29422693 | 1816 | * efivars->lock is not held on entry or exit. |
1da177e4 LT |
1817 | * Returns 1 on failure, 0 on success |
1818 | */ | |
1819 | static int | |
4142ef14 MW |
1820 | efivar_create_sysfs_entry(struct efivars *efivars, |
1821 | unsigned long variable_name_size, | |
1822 | efi_char16_t *variable_name, | |
1823 | efi_guid_t *vendor_guid) | |
1da177e4 | 1824 | { |
310ad754 | 1825 | int i, short_name_size; |
1da177e4 LT |
1826 | char *short_name; |
1827 | struct efivar_entry *new_efivar; | |
1828 | ||
310ad754 JK |
1829 | /* |
1830 | * Length of the variable bytes in ASCII, plus the '-' separator, | |
1831 | * plus the GUID, plus trailing NUL | |
1832 | */ | |
1833 | short_name_size = variable_name_size / sizeof(efi_char16_t) | |
1834 | + 1 + GUID_LEN + 1; | |
1835 | ||
1836 | short_name = kzalloc(short_name_size, GFP_KERNEL); | |
9c215384 | 1837 | new_efivar = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL); |
1da177e4 LT |
1838 | |
1839 | if (!short_name || !new_efivar) { | |
0933ad9c JJ |
1840 | kfree(short_name); |
1841 | kfree(new_efivar); | |
1da177e4 LT |
1842 | return 1; |
1843 | } | |
1da177e4 | 1844 | |
4142ef14 | 1845 | new_efivar->efivars = efivars; |
1da177e4 LT |
1846 | memcpy(new_efivar->var.VariableName, variable_name, |
1847 | variable_name_size); | |
1848 | memcpy(&(new_efivar->var.VendorGuid), vendor_guid, sizeof(efi_guid_t)); | |
1849 | ||
1850 | /* Convert Unicode to normal chars (assume top bits are 0), | |
1851 | ala UTF-8 */ | |
1852 | for (i=0; i < (int)(variable_name_size / sizeof(efi_char16_t)); i++) { | |
1853 | short_name[i] = variable_name[i] & 0xFF; | |
1854 | } | |
1855 | /* This is ugly, but necessary to separate one vendor's | |
1856 | private variables from another's. */ | |
1857 | ||
1858 | *(short_name + strlen(short_name)) = '-'; | |
1859 | efi_guid_unparse(vendor_guid, short_name + strlen(short_name)); | |
1860 | ||
29422693 | 1861 | new_efivar->kobj.kset = efivars->kset; |
d6d292c4 GKH |
1862 | i = kobject_init_and_add(&new_efivar->kobj, &efivar_ktype, NULL, |
1863 | "%s", short_name); | |
69b2186c JG |
1864 | if (i) { |
1865 | kfree(short_name); | |
1866 | kfree(new_efivar); | |
1867 | return 1; | |
1868 | } | |
1da177e4 | 1869 | |
d6d292c4 | 1870 | kobject_uevent(&new_efivar->kobj, KOBJ_ADD); |
0933ad9c JJ |
1871 | kfree(short_name); |
1872 | short_name = NULL; | |
1da177e4 | 1873 | |
81fa4e58 | 1874 | spin_lock_irq(&efivars->lock); |
29422693 | 1875 | list_add(&new_efivar->list, &efivars->list); |
81fa4e58 | 1876 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1877 | |
1878 | return 0; | |
1879 | } | |
d502fbb0 MW |
1880 | |
1881 | static int | |
1882 | create_efivars_bin_attributes(struct efivars *efivars) | |
1883 | { | |
1884 | struct bin_attribute *attr; | |
1885 | int error; | |
1886 | ||
1887 | /* new_var */ | |
1888 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
1889 | if (!attr) | |
1890 | return -ENOMEM; | |
1891 | ||
1892 | attr->attr.name = "new_var"; | |
1893 | attr->attr.mode = 0200; | |
1894 | attr->write = efivar_create; | |
1895 | attr->private = efivars; | |
1896 | efivars->new_var = attr; | |
1897 | ||
1898 | /* del_var */ | |
1899 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
1900 | if (!attr) { | |
1901 | error = -ENOMEM; | |
1902 | goto out_free; | |
1903 | } | |
1904 | attr->attr.name = "del_var"; | |
1905 | attr->attr.mode = 0200; | |
1906 | attr->write = efivar_delete; | |
1907 | attr->private = efivars; | |
1908 | efivars->del_var = attr; | |
1909 | ||
1910 | sysfs_bin_attr_init(efivars->new_var); | |
1911 | sysfs_bin_attr_init(efivars->del_var); | |
1912 | ||
1913 | /* Register */ | |
1914 | error = sysfs_create_bin_file(&efivars->kset->kobj, | |
1915 | efivars->new_var); | |
1916 | if (error) { | |
1917 | printk(KERN_ERR "efivars: unable to create new_var sysfs file" | |
1918 | " due to error %d\n", error); | |
1919 | goto out_free; | |
1920 | } | |
1921 | error = sysfs_create_bin_file(&efivars->kset->kobj, | |
1922 | efivars->del_var); | |
1923 | if (error) { | |
1924 | printk(KERN_ERR "efivars: unable to create del_var sysfs file" | |
1925 | " due to error %d\n", error); | |
1926 | sysfs_remove_bin_file(&efivars->kset->kobj, | |
1927 | efivars->new_var); | |
1928 | goto out_free; | |
1929 | } | |
1930 | ||
1931 | return 0; | |
1932 | out_free: | |
051d51bc DC |
1933 | kfree(efivars->del_var); |
1934 | efivars->del_var = NULL; | |
d502fbb0 MW |
1935 | kfree(efivars->new_var); |
1936 | efivars->new_var = NULL; | |
1937 | return error; | |
1938 | } | |
1939 | ||
4fc756bd | 1940 | void unregister_efivars(struct efivars *efivars) |
76b53f7c MW |
1941 | { |
1942 | struct efivar_entry *entry, *n; | |
4142ef14 | 1943 | |
76b53f7c | 1944 | list_for_each_entry_safe(entry, n, &efivars->list, list) { |
81fa4e58 | 1945 | spin_lock_irq(&efivars->lock); |
76b53f7c | 1946 | list_del(&entry->list); |
81fa4e58 | 1947 | spin_unlock_irq(&efivars->lock); |
76b53f7c MW |
1948 | efivar_unregister(entry); |
1949 | } | |
1950 | if (efivars->new_var) | |
1951 | sysfs_remove_bin_file(&efivars->kset->kobj, efivars->new_var); | |
1952 | if (efivars->del_var) | |
1953 | sysfs_remove_bin_file(&efivars->kset->kobj, efivars->del_var); | |
1954 | kfree(efivars->new_var); | |
1955 | kfree(efivars->del_var); | |
605e70c7 | 1956 | kobject_put(efivars->kobject); |
76b53f7c MW |
1957 | kset_unregister(efivars->kset); |
1958 | } | |
4fc756bd | 1959 | EXPORT_SYMBOL_GPL(unregister_efivars); |
1da177e4 | 1960 | |
4fc756bd MW |
1961 | int register_efivars(struct efivars *efivars, |
1962 | const struct efivar_operations *ops, | |
1963 | struct kobject *parent_kobj) | |
1da177e4 LT |
1964 | { |
1965 | efi_status_t status = EFI_NOT_FOUND; | |
1966 | efi_guid_t vendor_guid; | |
1967 | efi_char16_t *variable_name; | |
1da177e4 | 1968 | unsigned long variable_name_size = 1024; |
334c6307 | 1969 | int error = 0; |
1da177e4 | 1970 | |
9c215384 | 1971 | variable_name = kzalloc(variable_name_size, GFP_KERNEL); |
1da177e4 LT |
1972 | if (!variable_name) { |
1973 | printk(KERN_ERR "efivars: Memory allocation failed.\n"); | |
1974 | return -ENOMEM; | |
1975 | } | |
1976 | ||
29422693 MW |
1977 | spin_lock_init(&efivars->lock); |
1978 | INIT_LIST_HEAD(&efivars->list); | |
3295814d | 1979 | efivars->ops = ops; |
29422693 | 1980 | |
76b53f7c | 1981 | efivars->kset = kset_create_and_add("vars", NULL, parent_kobj); |
29422693 | 1982 | if (!efivars->kset) { |
66ac831e GKH |
1983 | printk(KERN_ERR "efivars: Subsystem registration failed.\n"); |
1984 | error = -ENOMEM; | |
76b53f7c | 1985 | goto out; |
1da177e4 LT |
1986 | } |
1987 | ||
605e70c7 LCY |
1988 | efivars->kobject = kobject_create_and_add("efivars", parent_kobj); |
1989 | if (!efivars->kobject) { | |
1990 | pr_err("efivars: Subsystem registration failed.\n"); | |
1991 | error = -ENOMEM; | |
1992 | kset_unregister(efivars->kset); | |
1993 | goto out; | |
1994 | } | |
1995 | ||
1da177e4 LT |
1996 | /* |
1997 | * Per EFI spec, the maximum storage allocated for both | |
1998 | * the variable name and variable data is 1024 bytes. | |
1999 | */ | |
2000 | ||
2001 | do { | |
2002 | variable_name_size = 1024; | |
2003 | ||
3295814d | 2004 | status = ops->get_next_variable(&variable_name_size, |
1da177e4 LT |
2005 | variable_name, |
2006 | &vendor_guid); | |
2007 | switch (status) { | |
2008 | case EFI_SUCCESS: | |
4142ef14 MW |
2009 | efivar_create_sysfs_entry(efivars, |
2010 | variable_name_size, | |
2011 | variable_name, | |
2012 | &vendor_guid); | |
1da177e4 LT |
2013 | break; |
2014 | case EFI_NOT_FOUND: | |
2015 | break; | |
2016 | default: | |
2017 | printk(KERN_WARNING "efivars: get_next_variable: status=%lx\n", | |
2018 | status); | |
2019 | status = EFI_NOT_FOUND; | |
2020 | break; | |
2021 | } | |
2022 | } while (status != EFI_NOT_FOUND); | |
2023 | ||
d502fbb0 | 2024 | error = create_efivars_bin_attributes(efivars); |
1da177e4 | 2025 | if (error) |
76b53f7c | 2026 | unregister_efivars(efivars); |
1da177e4 | 2027 | |
5ee9c198 MG |
2028 | efivars->efi_pstore_info = efi_pstore_info; |
2029 | ||
2030 | efivars->efi_pstore_info.buf = kmalloc(4096, GFP_KERNEL); | |
2031 | if (efivars->efi_pstore_info.buf) { | |
2032 | efivars->efi_pstore_info.bufsize = 1024; | |
2033 | efivars->efi_pstore_info.data = efivars; | |
abd4d558 | 2034 | spin_lock_init(&efivars->efi_pstore_info.buf_lock); |
5ee9c198 MG |
2035 | pstore_register(&efivars->efi_pstore_info); |
2036 | } | |
2037 | ||
5d9db883 MG |
2038 | register_filesystem(&efivarfs_type); |
2039 | ||
76b53f7c MW |
2040 | out: |
2041 | kfree(variable_name); | |
1da177e4 | 2042 | |
76b53f7c MW |
2043 | return error; |
2044 | } | |
4fc756bd | 2045 | EXPORT_SYMBOL_GPL(register_efivars); |
1da177e4 | 2046 | |
76b53f7c MW |
2047 | /* |
2048 | * For now we register the efi subsystem with the firmware subsystem | |
2049 | * and the vars subsystem with the efi subsystem. In the future, it | |
2050 | * might make sense to split off the efi subsystem into its own | |
2051 | * driver, but for now only efivars will register with it, so just | |
2052 | * include it here. | |
2053 | */ | |
2054 | ||
2055 | static int __init | |
2056 | efivars_init(void) | |
2057 | { | |
2058 | int error = 0; | |
2059 | ||
2060 | printk(KERN_INFO "EFI Variables Facility v%s %s\n", EFIVARS_VERSION, | |
2061 | EFIVARS_DATE); | |
2062 | ||
83e68189 | 2063 | if (!efi_enabled(EFI_RUNTIME_SERVICES)) |
4fc756bd | 2064 | return 0; |
76b53f7c MW |
2065 | |
2066 | /* For now we'll register the efi directory at /sys/firmware/efi */ | |
2067 | efi_kobj = kobject_create_and_add("efi", firmware_kobj); | |
2068 | if (!efi_kobj) { | |
2069 | printk(KERN_ERR "efivars: Firmware registration failed.\n"); | |
2070 | return -ENOMEM; | |
2071 | } | |
2072 | ||
3295814d MW |
2073 | ops.get_variable = efi.get_variable; |
2074 | ops.set_variable = efi.set_variable; | |
2075 | ops.get_next_variable = efi.get_next_variable; | |
d80a361d | 2076 | ops.query_variable_info = efi.query_variable_info; |
89d16665 | 2077 | |
3295814d | 2078 | error = register_efivars(&__efivars, &ops, efi_kobj); |
3116aabc DC |
2079 | if (error) |
2080 | goto err_put; | |
76b53f7c MW |
2081 | |
2082 | /* Don't forget the systab entry */ | |
2083 | error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group); | |
2084 | if (error) { | |
2085 | printk(KERN_ERR | |
2086 | "efivars: Sysfs attribute export failed with error %d.\n", | |
2087 | error); | |
3116aabc | 2088 | goto err_unregister; |
76b53f7c | 2089 | } |
1da177e4 | 2090 | |
3116aabc DC |
2091 | return 0; |
2092 | ||
2093 | err_unregister: | |
2094 | unregister_efivars(&__efivars); | |
2095 | err_put: | |
2096 | kobject_put(efi_kobj); | |
1da177e4 LT |
2097 | return error; |
2098 | } | |
2099 | ||
2100 | static void __exit | |
2101 | efivars_exit(void) | |
2102 | { | |
a93bc0c6 SA |
2103 | cancel_work_sync(&efivar_work); |
2104 | ||
83e68189 | 2105 | if (efi_enabled(EFI_RUNTIME_SERVICES)) { |
aabb6e15 RD |
2106 | unregister_efivars(&__efivars); |
2107 | kobject_put(efi_kobj); | |
2108 | } | |
1da177e4 LT |
2109 | } |
2110 | ||
2111 | module_init(efivars_init); | |
2112 | module_exit(efivars_exit); | |
2113 |