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 | |
ec0971ba SF |
106 | static bool efivars_pstore_disable = |
107 | IS_ENABLED(EFI_VARS_PSTORE_DEFAULT_DISABLE); | |
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); | |
173 | ||
1da177e4 LT |
174 | /* Return the number of unicode characters in data */ |
175 | static unsigned long | |
a2940908 | 176 | utf16_strnlen(efi_char16_t *s, size_t maxlength) |
1da177e4 LT |
177 | { |
178 | unsigned long length = 0; | |
179 | ||
a2940908 | 180 | while (*s++ != 0 && length < maxlength) |
1da177e4 LT |
181 | length++; |
182 | return length; | |
183 | } | |
184 | ||
b728a5c8 | 185 | static inline unsigned long |
a2940908 MW |
186 | utf16_strlen(efi_char16_t *s) |
187 | { | |
188 | return utf16_strnlen(s, ~0UL); | |
189 | } | |
190 | ||
1da177e4 LT |
191 | /* |
192 | * Return the number of bytes is the length of this string | |
193 | * Note: this is NOT the same as the number of unicode characters | |
194 | */ | |
195 | static inline unsigned long | |
a2940908 | 196 | utf16_strsize(efi_char16_t *data, unsigned long maxlength) |
1da177e4 | 197 | { |
a2940908 | 198 | return utf16_strnlen(data, maxlength/sizeof(efi_char16_t)) * sizeof(efi_char16_t); |
1da177e4 LT |
199 | } |
200 | ||
828aa1f0 MW |
201 | static inline int |
202 | utf16_strncmp(const efi_char16_t *a, const efi_char16_t *b, size_t len) | |
203 | { | |
204 | while (1) { | |
205 | if (len == 0) | |
206 | return 0; | |
207 | if (*a < *b) | |
208 | return -1; | |
209 | if (*a > *b) | |
210 | return 1; | |
211 | if (*a == 0) /* implies *b == 0 */ | |
212 | return 0; | |
213 | a++; | |
214 | b++; | |
215 | len--; | |
216 | } | |
217 | } | |
218 | ||
fec6c20b | 219 | static bool |
54b3a4d3 MG |
220 | validate_device_path(struct efi_variable *var, int match, u8 *buffer, |
221 | unsigned long len) | |
fec6c20b MG |
222 | { |
223 | struct efi_generic_dev_path *node; | |
224 | int offset = 0; | |
225 | ||
226 | node = (struct efi_generic_dev_path *)buffer; | |
227 | ||
54b3a4d3 MG |
228 | if (len < sizeof(*node)) |
229 | return false; | |
fec6c20b | 230 | |
54b3a4d3 MG |
231 | while (offset <= len - sizeof(*node) && |
232 | node->length >= sizeof(*node) && | |
233 | node->length <= len - offset) { | |
234 | offset += node->length; | |
fec6c20b MG |
235 | |
236 | if ((node->type == EFI_DEV_END_PATH || | |
237 | node->type == EFI_DEV_END_PATH2) && | |
238 | node->sub_type == EFI_DEV_END_ENTIRE) | |
239 | return true; | |
240 | ||
241 | node = (struct efi_generic_dev_path *)(buffer + offset); | |
242 | } | |
243 | ||
244 | /* | |
245 | * If we're here then either node->length pointed past the end | |
246 | * of the buffer or we reached the end of the buffer without | |
247 | * finding a device path end node. | |
248 | */ | |
249 | return false; | |
250 | } | |
251 | ||
252 | static bool | |
54b3a4d3 MG |
253 | validate_boot_order(struct efi_variable *var, int match, u8 *buffer, |
254 | unsigned long len) | |
fec6c20b MG |
255 | { |
256 | /* An array of 16-bit integers */ | |
257 | if ((len % 2) != 0) | |
258 | return false; | |
259 | ||
260 | return true; | |
261 | } | |
262 | ||
263 | static bool | |
54b3a4d3 MG |
264 | validate_load_option(struct efi_variable *var, int match, u8 *buffer, |
265 | unsigned long len) | |
fec6c20b MG |
266 | { |
267 | u16 filepathlength; | |
54b3a4d3 MG |
268 | int i, desclength = 0, namelen; |
269 | ||
270 | namelen = utf16_strnlen(var->VariableName, sizeof(var->VariableName)); | |
fec6c20b MG |
271 | |
272 | /* Either "Boot" or "Driver" followed by four digits of hex */ | |
273 | for (i = match; i < match+4; i++) { | |
54b3a4d3 MG |
274 | if (var->VariableName[i] > 127 || |
275 | hex_to_bin(var->VariableName[i] & 0xff) < 0) | |
fec6c20b MG |
276 | return true; |
277 | } | |
278 | ||
54b3a4d3 MG |
279 | /* Reject it if there's 4 digits of hex and then further content */ |
280 | if (namelen > match + 4) | |
281 | return false; | |
282 | ||
283 | /* A valid entry must be at least 8 bytes */ | |
284 | if (len < 8) | |
fec6c20b MG |
285 | return false; |
286 | ||
287 | filepathlength = buffer[4] | buffer[5] << 8; | |
288 | ||
289 | /* | |
290 | * There's no stored length for the description, so it has to be | |
291 | * found by hand | |
292 | */ | |
54b3a4d3 | 293 | desclength = utf16_strsize((efi_char16_t *)(buffer + 6), len - 6) + 2; |
fec6c20b MG |
294 | |
295 | /* Each boot entry must have a descriptor */ | |
296 | if (!desclength) | |
297 | return false; | |
298 | ||
299 | /* | |
300 | * If the sum of the length of the description, the claimed filepath | |
301 | * length and the original header are greater than the length of the | |
302 | * variable, it's malformed | |
303 | */ | |
304 | if ((desclength + filepathlength + 6) > len) | |
305 | return false; | |
306 | ||
307 | /* | |
308 | * And, finally, check the filepath | |
309 | */ | |
310 | return validate_device_path(var, match, buffer + desclength + 6, | |
311 | filepathlength); | |
312 | } | |
313 | ||
314 | static bool | |
54b3a4d3 MG |
315 | validate_uint16(struct efi_variable *var, int match, u8 *buffer, |
316 | unsigned long len) | |
fec6c20b MG |
317 | { |
318 | /* A single 16-bit integer */ | |
319 | if (len != 2) | |
320 | return false; | |
321 | ||
322 | return true; | |
323 | } | |
324 | ||
325 | static bool | |
54b3a4d3 MG |
326 | validate_ascii_string(struct efi_variable *var, int match, u8 *buffer, |
327 | unsigned long len) | |
fec6c20b MG |
328 | { |
329 | int i; | |
330 | ||
331 | for (i = 0; i < len; i++) { | |
332 | if (buffer[i] > 127) | |
333 | return false; | |
334 | ||
335 | if (buffer[i] == 0) | |
336 | return true; | |
337 | } | |
338 | ||
339 | return false; | |
340 | } | |
341 | ||
342 | struct variable_validate { | |
343 | char *name; | |
344 | bool (*validate)(struct efi_variable *var, int match, u8 *data, | |
54b3a4d3 | 345 | unsigned long len); |
fec6c20b MG |
346 | }; |
347 | ||
348 | static const struct variable_validate variable_validate[] = { | |
349 | { "BootNext", validate_uint16 }, | |
350 | { "BootOrder", validate_boot_order }, | |
351 | { "DriverOrder", validate_boot_order }, | |
352 | { "Boot*", validate_load_option }, | |
353 | { "Driver*", validate_load_option }, | |
354 | { "ConIn", validate_device_path }, | |
355 | { "ConInDev", validate_device_path }, | |
356 | { "ConOut", validate_device_path }, | |
357 | { "ConOutDev", validate_device_path }, | |
358 | { "ErrOut", validate_device_path }, | |
359 | { "ErrOutDev", validate_device_path }, | |
360 | { "Timeout", validate_uint16 }, | |
361 | { "Lang", validate_ascii_string }, | |
362 | { "PlatformLang", validate_ascii_string }, | |
363 | { "", NULL }, | |
364 | }; | |
365 | ||
366 | static bool | |
54b3a4d3 | 367 | validate_var(struct efi_variable *var, u8 *data, unsigned long len) |
fec6c20b MG |
368 | { |
369 | int i; | |
370 | u16 *unicode_name = var->VariableName; | |
371 | ||
372 | for (i = 0; variable_validate[i].validate != NULL; i++) { | |
373 | const char *name = variable_validate[i].name; | |
374 | int match; | |
375 | ||
376 | for (match = 0; ; match++) { | |
377 | char c = name[match]; | |
378 | u16 u = unicode_name[match]; | |
379 | ||
380 | /* All special variables are plain ascii */ | |
381 | if (u > 127) | |
382 | return true; | |
383 | ||
384 | /* Wildcard in the matching name means we've matched */ | |
385 | if (c == '*') | |
386 | return variable_validate[i].validate(var, | |
387 | match, data, len); | |
388 | ||
389 | /* Case sensitive match */ | |
390 | if (c != u) | |
391 | break; | |
392 | ||
393 | /* Reached the end of the string while matching */ | |
394 | if (!c) | |
395 | return variable_validate[i].validate(var, | |
396 | match, data, len); | |
397 | } | |
398 | } | |
399 | ||
400 | return true; | |
401 | } | |
402 | ||
1da177e4 | 403 | static efi_status_t |
5ee9c198 | 404 | get_var_data_locked(struct efivars *efivars, struct efi_variable *var) |
1da177e4 LT |
405 | { |
406 | efi_status_t status; | |
407 | ||
1da177e4 | 408 | var->DataSize = 1024; |
3295814d MW |
409 | status = efivars->ops->get_variable(var->VariableName, |
410 | &var->VendorGuid, | |
411 | &var->Attributes, | |
412 | &var->DataSize, | |
413 | var->Data); | |
5ee9c198 MG |
414 | return status; |
415 | } | |
416 | ||
417 | static efi_status_t | |
418 | get_var_data(struct efivars *efivars, struct efi_variable *var) | |
419 | { | |
420 | efi_status_t status; | |
81fa4e58 | 421 | unsigned long flags; |
5ee9c198 | 422 | |
81fa4e58 | 423 | spin_lock_irqsave(&efivars->lock, flags); |
5ee9c198 | 424 | status = get_var_data_locked(efivars, var); |
81fa4e58 | 425 | spin_unlock_irqrestore(&efivars->lock, flags); |
5ee9c198 | 426 | |
1da177e4 LT |
427 | if (status != EFI_SUCCESS) { |
428 | printk(KERN_WARNING "efivars: get_variable() failed 0x%lx!\n", | |
429 | status); | |
430 | } | |
431 | return status; | |
432 | } | |
433 | ||
68d92986 MG |
434 | static efi_status_t |
435 | check_var_size_locked(struct efivars *efivars, u32 attributes, | |
436 | unsigned long size) | |
437 | { | |
438 | u64 storage_size, remaining_size, max_size; | |
439 | efi_status_t status; | |
440 | const struct efivar_operations *fops = efivars->ops; | |
441 | ||
442 | if (!efivars->ops->query_variable_info) | |
443 | return EFI_UNSUPPORTED; | |
444 | ||
445 | status = fops->query_variable_info(attributes, &storage_size, | |
446 | &remaining_size, &max_size); | |
447 | ||
448 | if (status != EFI_SUCCESS) | |
449 | return status; | |
450 | ||
451 | if (!storage_size || size > remaining_size || size > max_size || | |
452 | (remaining_size - size) < (storage_size / 2)) | |
453 | return EFI_OUT_OF_RESOURCES; | |
454 | ||
455 | return status; | |
456 | } | |
457 | ||
458 | ||
459 | static efi_status_t | |
460 | check_var_size(struct efivars *efivars, u32 attributes, unsigned long size) | |
461 | { | |
462 | efi_status_t status; | |
463 | unsigned long flags; | |
464 | ||
465 | spin_lock_irqsave(&efivars->lock, flags); | |
466 | status = check_var_size_locked(efivars, attributes, size); | |
467 | spin_unlock_irqrestore(&efivars->lock, flags); | |
468 | ||
469 | return status; | |
470 | } | |
471 | ||
1da177e4 LT |
472 | static ssize_t |
473 | efivar_guid_read(struct efivar_entry *entry, char *buf) | |
474 | { | |
475 | struct efi_variable *var = &entry->var; | |
476 | char *str = buf; | |
477 | ||
478 | if (!entry || !buf) | |
479 | return 0; | |
480 | ||
481 | efi_guid_unparse(&var->VendorGuid, str); | |
482 | str += strlen(str); | |
483 | str += sprintf(str, "\n"); | |
484 | ||
485 | return str - buf; | |
486 | } | |
487 | ||
488 | static ssize_t | |
489 | efivar_attr_read(struct efivar_entry *entry, char *buf) | |
490 | { | |
491 | struct efi_variable *var = &entry->var; | |
492 | char *str = buf; | |
493 | efi_status_t status; | |
494 | ||
495 | if (!entry || !buf) | |
496 | return -EINVAL; | |
497 | ||
4142ef14 | 498 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
499 | if (status != EFI_SUCCESS) |
500 | return -EIO; | |
501 | ||
70839090 | 502 | if (var->Attributes & EFI_VARIABLE_NON_VOLATILE) |
1da177e4 | 503 | str += sprintf(str, "EFI_VARIABLE_NON_VOLATILE\n"); |
70839090 | 504 | if (var->Attributes & EFI_VARIABLE_BOOTSERVICE_ACCESS) |
1da177e4 | 505 | str += sprintf(str, "EFI_VARIABLE_BOOTSERVICE_ACCESS\n"); |
70839090 | 506 | if (var->Attributes & EFI_VARIABLE_RUNTIME_ACCESS) |
1da177e4 | 507 | str += sprintf(str, "EFI_VARIABLE_RUNTIME_ACCESS\n"); |
70839090 KA |
508 | if (var->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) |
509 | str += sprintf(str, "EFI_VARIABLE_HARDWARE_ERROR_RECORD\n"); | |
510 | if (var->Attributes & EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS) | |
511 | str += sprintf(str, | |
512 | "EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS\n"); | |
513 | if (var->Attributes & | |
514 | EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS) | |
515 | str += sprintf(str, | |
516 | "EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS\n"); | |
517 | if (var->Attributes & EFI_VARIABLE_APPEND_WRITE) | |
518 | str += sprintf(str, "EFI_VARIABLE_APPEND_WRITE\n"); | |
1da177e4 LT |
519 | return str - buf; |
520 | } | |
521 | ||
522 | static ssize_t | |
523 | efivar_size_read(struct efivar_entry *entry, char *buf) | |
524 | { | |
525 | struct efi_variable *var = &entry->var; | |
526 | char *str = buf; | |
527 | efi_status_t status; | |
528 | ||
529 | if (!entry || !buf) | |
530 | return -EINVAL; | |
531 | ||
4142ef14 | 532 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
533 | if (status != EFI_SUCCESS) |
534 | return -EIO; | |
535 | ||
536 | str += sprintf(str, "0x%lx\n", var->DataSize); | |
537 | return str - buf; | |
538 | } | |
539 | ||
540 | static ssize_t | |
541 | efivar_data_read(struct efivar_entry *entry, char *buf) | |
542 | { | |
543 | struct efi_variable *var = &entry->var; | |
544 | efi_status_t status; | |
545 | ||
546 | if (!entry || !buf) | |
547 | return -EINVAL; | |
548 | ||
4142ef14 | 549 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
550 | if (status != EFI_SUCCESS) |
551 | return -EIO; | |
552 | ||
553 | memcpy(buf, var->Data, var->DataSize); | |
554 | return var->DataSize; | |
555 | } | |
556 | /* | |
557 | * We allow each variable to be edited via rewriting the | |
558 | * entire efi variable structure. | |
559 | */ | |
560 | static ssize_t | |
561 | efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count) | |
562 | { | |
563 | struct efi_variable *new_var, *var = &entry->var; | |
4142ef14 | 564 | struct efivars *efivars = entry->efivars; |
1da177e4 LT |
565 | efi_status_t status = EFI_NOT_FOUND; |
566 | ||
567 | if (count != sizeof(struct efi_variable)) | |
568 | return -EINVAL; | |
569 | ||
570 | new_var = (struct efi_variable *)buf; | |
571 | /* | |
572 | * If only updating the variable data, then the name | |
573 | * and guid should remain the same | |
574 | */ | |
575 | if (memcmp(new_var->VariableName, var->VariableName, sizeof(var->VariableName)) || | |
576 | efi_guidcmp(new_var->VendorGuid, var->VendorGuid)) { | |
577 | printk(KERN_ERR "efivars: Cannot edit the wrong variable!\n"); | |
578 | return -EINVAL; | |
579 | } | |
580 | ||
581 | if ((new_var->DataSize <= 0) || (new_var->Attributes == 0)){ | |
582 | printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n"); | |
583 | return -EINVAL; | |
584 | } | |
585 | ||
fec6c20b MG |
586 | if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 || |
587 | validate_var(new_var, new_var->Data, new_var->DataSize) == false) { | |
588 | printk(KERN_ERR "efivars: Malformed variable content\n"); | |
589 | return -EINVAL; | |
590 | } | |
591 | ||
81fa4e58 | 592 | spin_lock_irq(&efivars->lock); |
68d92986 MG |
593 | |
594 | status = check_var_size_locked(efivars, new_var->Attributes, | |
595 | new_var->DataSize + utf16_strsize(new_var->VariableName, 1024)); | |
596 | ||
597 | if (status == EFI_SUCCESS || status == EFI_UNSUPPORTED) | |
598 | status = efivars->ops->set_variable(new_var->VariableName, | |
599 | &new_var->VendorGuid, | |
600 | new_var->Attributes, | |
601 | new_var->DataSize, | |
602 | new_var->Data); | |
1da177e4 | 603 | |
81fa4e58 | 604 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
605 | |
606 | if (status != EFI_SUCCESS) { | |
607 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
608 | status); | |
609 | return -EIO; | |
610 | } | |
611 | ||
612 | memcpy(&entry->var, new_var, count); | |
613 | return count; | |
614 | } | |
615 | ||
616 | static ssize_t | |
617 | efivar_show_raw(struct efivar_entry *entry, char *buf) | |
618 | { | |
619 | struct efi_variable *var = &entry->var; | |
620 | efi_status_t status; | |
621 | ||
622 | if (!entry || !buf) | |
623 | return 0; | |
624 | ||
4142ef14 | 625 | status = get_var_data(entry->efivars, var); |
1da177e4 LT |
626 | if (status != EFI_SUCCESS) |
627 | return -EIO; | |
628 | ||
629 | memcpy(buf, var, sizeof(*var)); | |
630 | return sizeof(*var); | |
631 | } | |
632 | ||
633 | /* | |
634 | * Generic read/write functions that call the specific functions of | |
70f23fd6 | 635 | * the attributes... |
1da177e4 LT |
636 | */ |
637 | static ssize_t efivar_attr_show(struct kobject *kobj, struct attribute *attr, | |
638 | char *buf) | |
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->show) { | |
648 | ret = efivar_attr->show(var, buf); | |
649 | } | |
650 | return ret; | |
651 | } | |
652 | ||
653 | static ssize_t efivar_attr_store(struct kobject *kobj, struct attribute *attr, | |
654 | const char *buf, size_t count) | |
655 | { | |
656 | struct efivar_entry *var = to_efivar_entry(kobj); | |
657 | struct efivar_attribute *efivar_attr = to_efivar_attr(attr); | |
70f2817a | 658 | ssize_t ret = -EIO; |
1da177e4 LT |
659 | |
660 | if (!capable(CAP_SYS_ADMIN)) | |
661 | return -EACCES; | |
662 | ||
663 | if (efivar_attr->store) | |
664 | ret = efivar_attr->store(var, buf, count); | |
665 | ||
666 | return ret; | |
667 | } | |
668 | ||
52cf25d0 | 669 | static const struct sysfs_ops efivar_attr_ops = { |
1da177e4 LT |
670 | .show = efivar_attr_show, |
671 | .store = efivar_attr_store, | |
672 | }; | |
673 | ||
674 | static void efivar_release(struct kobject *kobj) | |
675 | { | |
676 | struct efivar_entry *var = container_of(kobj, struct efivar_entry, kobj); | |
1da177e4 LT |
677 | kfree(var); |
678 | } | |
679 | ||
680 | static EFIVAR_ATTR(guid, 0400, efivar_guid_read, NULL); | |
681 | static EFIVAR_ATTR(attributes, 0400, efivar_attr_read, NULL); | |
682 | static EFIVAR_ATTR(size, 0400, efivar_size_read, NULL); | |
683 | static EFIVAR_ATTR(data, 0400, efivar_data_read, NULL); | |
684 | static EFIVAR_ATTR(raw_var, 0600, efivar_show_raw, efivar_store_raw); | |
685 | ||
686 | static struct attribute *def_attrs[] = { | |
687 | &efivar_attr_guid.attr, | |
688 | &efivar_attr_size.attr, | |
689 | &efivar_attr_attributes.attr, | |
690 | &efivar_attr_data.attr, | |
691 | &efivar_attr_raw_var.attr, | |
692 | NULL, | |
693 | }; | |
694 | ||
e89a4116 | 695 | static struct kobj_type efivar_ktype = { |
1da177e4 LT |
696 | .release = efivar_release, |
697 | .sysfs_ops = &efivar_attr_ops, | |
698 | .default_attrs = def_attrs, | |
699 | }; | |
700 | ||
1da177e4 LT |
701 | static inline void |
702 | efivar_unregister(struct efivar_entry *var) | |
703 | { | |
c10997f6 | 704 | kobject_put(&var->kobj); |
1da177e4 LT |
705 | } |
706 | ||
5d9db883 MG |
707 | static int efivarfs_file_open(struct inode *inode, struct file *file) |
708 | { | |
709 | file->private_data = inode->i_private; | |
710 | return 0; | |
711 | } | |
712 | ||
7253eaba MF |
713 | static int efi_status_to_err(efi_status_t status) |
714 | { | |
715 | int err; | |
716 | ||
717 | switch (status) { | |
718 | case EFI_INVALID_PARAMETER: | |
719 | err = -EINVAL; | |
720 | break; | |
721 | case EFI_OUT_OF_RESOURCES: | |
722 | err = -ENOSPC; | |
723 | break; | |
724 | case EFI_DEVICE_ERROR: | |
725 | err = -EIO; | |
726 | break; | |
727 | case EFI_WRITE_PROTECTED: | |
728 | err = -EROFS; | |
729 | break; | |
730 | case EFI_SECURITY_VIOLATION: | |
731 | err = -EACCES; | |
732 | break; | |
733 | case EFI_NOT_FOUND: | |
1fa7e695 | 734 | err = -EIO; |
7253eaba MF |
735 | break; |
736 | default: | |
737 | err = -EINVAL; | |
738 | } | |
739 | ||
740 | return err; | |
741 | } | |
742 | ||
5d9db883 MG |
743 | static ssize_t efivarfs_file_write(struct file *file, |
744 | const char __user *userbuf, size_t count, loff_t *ppos) | |
745 | { | |
746 | struct efivar_entry *var = file->private_data; | |
747 | struct efivars *efivars; | |
748 | efi_status_t status; | |
749 | void *data; | |
750 | u32 attributes; | |
751 | struct inode *inode = file->f_mapping->host; | |
07b1c5bc | 752 | unsigned long datasize = count - sizeof(attributes); |
68d92986 | 753 | unsigned long newdatasize, varsize; |
cfcf2f11 | 754 | ssize_t bytes = 0; |
5d9db883 MG |
755 | |
756 | if (count < sizeof(attributes)) | |
757 | return -EINVAL; | |
758 | ||
89d16665 MF |
759 | if (copy_from_user(&attributes, userbuf, sizeof(attributes))) |
760 | return -EFAULT; | |
5d9db883 | 761 | |
89d16665 MF |
762 | if (attributes & ~(EFI_VARIABLE_MASK)) |
763 | return -EINVAL; | |
5d9db883 MG |
764 | |
765 | efivars = var->efivars; | |
766 | ||
89d16665 MF |
767 | /* |
768 | * Ensure that the user can't allocate arbitrarily large | |
769 | * amounts of memory. Pick a default size of 64K if | |
770 | * QueryVariableInfo() isn't supported by the firmware. | |
771 | */ | |
89d16665 | 772 | |
68d92986 MG |
773 | varsize = datasize + utf16_strsize(var->var.VariableName, 1024); |
774 | status = check_var_size(efivars, attributes, varsize); | |
89d16665 MF |
775 | |
776 | if (status != EFI_SUCCESS) { | |
777 | if (status != EFI_UNSUPPORTED) | |
778 | return efi_status_to_err(status); | |
779 | ||
68d92986 MG |
780 | if (datasize > 65536) |
781 | return -ENOSPC; | |
5d9db883 MG |
782 | } |
783 | ||
89d16665 MF |
784 | data = kmalloc(datasize, GFP_KERNEL); |
785 | if (!data) | |
786 | return -ENOMEM; | |
787 | ||
5d9db883 | 788 | if (copy_from_user(data, userbuf + sizeof(attributes), datasize)) { |
cfcf2f11 | 789 | bytes = -EFAULT; |
5d9db883 MG |
790 | goto out; |
791 | } | |
792 | ||
793 | if (validate_var(&var->var, data, datasize) == false) { | |
cfcf2f11 | 794 | bytes = -EINVAL; |
5d9db883 MG |
795 | goto out; |
796 | } | |
797 | ||
f5f6a60a JK |
798 | /* |
799 | * The lock here protects the get_variable call, the conditional | |
800 | * set_variable call, and removal of the variable from the efivars | |
801 | * list (in the case of an authenticated delete). | |
802 | */ | |
81fa4e58 | 803 | spin_lock_irq(&efivars->lock); |
f5f6a60a | 804 | |
68d92986 MG |
805 | /* |
806 | * Ensure that the available space hasn't shrunk below the safe level | |
807 | */ | |
808 | ||
809 | status = check_var_size_locked(efivars, attributes, varsize); | |
810 | ||
811 | if (status != EFI_SUCCESS && status != EFI_UNSUPPORTED) { | |
812 | spin_unlock_irq(&efivars->lock); | |
813 | kfree(data); | |
814 | ||
815 | return efi_status_to_err(status); | |
816 | } | |
817 | ||
5d9db883 MG |
818 | status = efivars->ops->set_variable(var->var.VariableName, |
819 | &var->var.VendorGuid, | |
820 | attributes, datasize, | |
821 | data); | |
822 | ||
f5f6a60a | 823 | if (status != EFI_SUCCESS) { |
81fa4e58 | 824 | spin_unlock_irq(&efivars->lock); |
f5f6a60a JK |
825 | kfree(data); |
826 | ||
7253eaba | 827 | return efi_status_to_err(status); |
5d9db883 | 828 | } |
0c542edd | 829 | |
cfcf2f11 MF |
830 | bytes = count; |
831 | ||
0c542edd JK |
832 | /* |
833 | * Writing to the variable may have caused a change in size (which | |
834 | * could either be an append or an overwrite), or the variable to be | |
835 | * deleted. Perform a GetVariable() so we can tell what actually | |
836 | * happened. | |
837 | */ | |
838 | newdatasize = 0; | |
839 | status = efivars->ops->get_variable(var->var.VariableName, | |
840 | &var->var.VendorGuid, | |
841 | NULL, &newdatasize, | |
842 | NULL); | |
843 | ||
844 | if (status == EFI_BUFFER_TOO_SMALL) { | |
81fa4e58 | 845 | spin_unlock_irq(&efivars->lock); |
0c542edd JK |
846 | mutex_lock(&inode->i_mutex); |
847 | i_size_write(inode, newdatasize + sizeof(attributes)); | |
848 | mutex_unlock(&inode->i_mutex); | |
849 | ||
850 | } else if (status == EFI_NOT_FOUND) { | |
0c542edd | 851 | list_del(&var->list); |
81fa4e58 | 852 | spin_unlock_irq(&efivars->lock); |
0c542edd JK |
853 | efivar_unregister(var); |
854 | drop_nlink(inode); | |
791eb564 | 855 | d_delete(file->f_dentry); |
0c542edd JK |
856 | dput(file->f_dentry); |
857 | ||
858 | } else { | |
81fa4e58 | 859 | spin_unlock_irq(&efivars->lock); |
0c542edd JK |
860 | pr_warn("efivarfs: inconsistent EFI variable implementation? " |
861 | "status = %lx\n", status); | |
862 | } | |
863 | ||
5d9db883 MG |
864 | out: |
865 | kfree(data); | |
866 | ||
cfcf2f11 | 867 | return bytes; |
5d9db883 MG |
868 | } |
869 | ||
870 | static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf, | |
871 | size_t count, loff_t *ppos) | |
872 | { | |
873 | struct efivar_entry *var = file->private_data; | |
874 | struct efivars *efivars = var->efivars; | |
875 | efi_status_t status; | |
876 | unsigned long datasize = 0; | |
877 | u32 attributes; | |
878 | void *data; | |
d142df03 | 879 | ssize_t size = 0; |
5d9db883 | 880 | |
81fa4e58 | 881 | spin_lock_irq(&efivars->lock); |
5d9db883 MG |
882 | status = efivars->ops->get_variable(var->var.VariableName, |
883 | &var->var.VendorGuid, | |
884 | &attributes, &datasize, NULL); | |
81fa4e58 | 885 | spin_unlock_irq(&efivars->lock); |
5d9db883 MG |
886 | |
887 | if (status != EFI_BUFFER_TOO_SMALL) | |
7253eaba | 888 | return efi_status_to_err(status); |
5d9db883 | 889 | |
d2923841 | 890 | data = kmalloc(datasize + sizeof(attributes), GFP_KERNEL); |
5d9db883 MG |
891 | |
892 | if (!data) | |
7253eaba | 893 | return -ENOMEM; |
5d9db883 | 894 | |
81fa4e58 | 895 | spin_lock_irq(&efivars->lock); |
5d9db883 MG |
896 | status = efivars->ops->get_variable(var->var.VariableName, |
897 | &var->var.VendorGuid, | |
898 | &attributes, &datasize, | |
d2923841 | 899 | (data + sizeof(attributes))); |
81fa4e58 | 900 | spin_unlock_irq(&efivars->lock); |
f5f6a60a | 901 | |
7253eaba MF |
902 | if (status != EFI_SUCCESS) { |
903 | size = efi_status_to_err(status); | |
d142df03 | 904 | goto out_free; |
7253eaba | 905 | } |
5d9db883 | 906 | |
d2923841 | 907 | memcpy(data, &attributes, sizeof(attributes)); |
5d9db883 | 908 | size = simple_read_from_buffer(userbuf, count, ppos, |
d2923841 | 909 | data, datasize + sizeof(attributes)); |
d142df03 | 910 | out_free: |
5d9db883 MG |
911 | kfree(data); |
912 | ||
913 | return size; | |
914 | } | |
915 | ||
916 | static void efivarfs_evict_inode(struct inode *inode) | |
917 | { | |
918 | clear_inode(inode); | |
919 | } | |
920 | ||
921 | static const struct super_operations efivarfs_ops = { | |
922 | .statfs = simple_statfs, | |
923 | .drop_inode = generic_delete_inode, | |
924 | .evict_inode = efivarfs_evict_inode, | |
925 | .show_options = generic_show_options, | |
926 | }; | |
927 | ||
928 | static struct super_block *efivarfs_sb; | |
929 | ||
930 | static const struct inode_operations efivarfs_dir_inode_operations; | |
931 | ||
932 | static const struct file_operations efivarfs_file_operations = { | |
933 | .open = efivarfs_file_open, | |
934 | .read = efivarfs_file_read, | |
935 | .write = efivarfs_file_write, | |
936 | .llseek = no_llseek, | |
937 | }; | |
938 | ||
939 | static struct inode *efivarfs_get_inode(struct super_block *sb, | |
940 | const struct inode *dir, int mode, dev_t dev) | |
941 | { | |
942 | struct inode *inode = new_inode(sb); | |
943 | ||
944 | if (inode) { | |
945 | inode->i_ino = get_next_ino(); | |
5d9db883 MG |
946 | inode->i_mode = mode; |
947 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
948 | switch (mode & S_IFMT) { | |
949 | case S_IFREG: | |
950 | inode->i_fop = &efivarfs_file_operations; | |
951 | break; | |
952 | case S_IFDIR: | |
953 | inode->i_op = &efivarfs_dir_inode_operations; | |
954 | inode->i_fop = &simple_dir_operations; | |
955 | inc_nlink(inode); | |
956 | break; | |
957 | } | |
958 | } | |
959 | return inode; | |
960 | } | |
961 | ||
47f531e8 MF |
962 | /* |
963 | * Return true if 'str' is a valid efivarfs filename of the form, | |
964 | * | |
965 | * VariableName-12345678-1234-1234-1234-1234567891bc | |
966 | */ | |
967 | static bool efivarfs_valid_name(const char *str, int len) | |
968 | { | |
969 | static const char dashes[GUID_LEN] = { | |
970 | [8] = 1, [13] = 1, [18] = 1, [23] = 1 | |
971 | }; | |
972 | const char *s = str + len - GUID_LEN; | |
973 | int i; | |
974 | ||
975 | /* | |
976 | * We need a GUID, plus at least one letter for the variable name, | |
977 | * plus the '-' separator | |
978 | */ | |
979 | if (len < GUID_LEN + 2) | |
980 | return false; | |
981 | ||
123abd76 MF |
982 | /* GUID must be preceded by a '-' */ |
983 | if (*(s - 1) != '-') | |
47f531e8 MF |
984 | return false; |
985 | ||
986 | /* | |
987 | * Validate that 's' is of the correct format, e.g. | |
988 | * | |
989 | * 12345678-1234-1234-1234-123456789abc | |
990 | */ | |
991 | for (i = 0; i < GUID_LEN; i++) { | |
992 | if (dashes[i]) { | |
993 | if (*s++ != '-') | |
994 | return false; | |
995 | } else { | |
996 | if (!isxdigit(*s++)) | |
997 | return false; | |
998 | } | |
999 | } | |
1000 | ||
1001 | return true; | |
1002 | } | |
1003 | ||
5d9db883 MG |
1004 | static void efivarfs_hex_to_guid(const char *str, efi_guid_t *guid) |
1005 | { | |
1006 | guid->b[0] = hex_to_bin(str[6]) << 4 | hex_to_bin(str[7]); | |
1007 | guid->b[1] = hex_to_bin(str[4]) << 4 | hex_to_bin(str[5]); | |
1008 | guid->b[2] = hex_to_bin(str[2]) << 4 | hex_to_bin(str[3]); | |
1009 | guid->b[3] = hex_to_bin(str[0]) << 4 | hex_to_bin(str[1]); | |
1010 | guid->b[4] = hex_to_bin(str[11]) << 4 | hex_to_bin(str[12]); | |
1011 | guid->b[5] = hex_to_bin(str[9]) << 4 | hex_to_bin(str[10]); | |
1012 | guid->b[6] = hex_to_bin(str[16]) << 4 | hex_to_bin(str[17]); | |
1013 | guid->b[7] = hex_to_bin(str[14]) << 4 | hex_to_bin(str[15]); | |
1014 | guid->b[8] = hex_to_bin(str[19]) << 4 | hex_to_bin(str[20]); | |
1015 | guid->b[9] = hex_to_bin(str[21]) << 4 | hex_to_bin(str[22]); | |
1016 | guid->b[10] = hex_to_bin(str[24]) << 4 | hex_to_bin(str[25]); | |
1017 | guid->b[11] = hex_to_bin(str[26]) << 4 | hex_to_bin(str[27]); | |
1018 | guid->b[12] = hex_to_bin(str[28]) << 4 | hex_to_bin(str[29]); | |
1019 | guid->b[13] = hex_to_bin(str[30]) << 4 | hex_to_bin(str[31]); | |
1020 | guid->b[14] = hex_to_bin(str[32]) << 4 | hex_to_bin(str[33]); | |
1021 | guid->b[15] = hex_to_bin(str[34]) << 4 | hex_to_bin(str[35]); | |
1022 | } | |
1023 | ||
1024 | static int efivarfs_create(struct inode *dir, struct dentry *dentry, | |
1025 | umode_t mode, bool excl) | |
1026 | { | |
45a937a8 | 1027 | struct inode *inode; |
5d9db883 MG |
1028 | struct efivars *efivars = &__efivars; |
1029 | struct efivar_entry *var; | |
1030 | int namelen, i = 0, err = 0; | |
1031 | ||
47f531e8 | 1032 | if (!efivarfs_valid_name(dentry->d_name.name, dentry->d_name.len)) |
5d9db883 MG |
1033 | return -EINVAL; |
1034 | ||
45a937a8 | 1035 | inode = efivarfs_get_inode(dir->i_sb, dir, mode, 0); |
5d9db883 | 1036 | if (!inode) |
aeeaa8d4 | 1037 | return -ENOMEM; |
5d9db883 MG |
1038 | |
1039 | var = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL); | |
45a937a8 AW |
1040 | if (!var) { |
1041 | err = -ENOMEM; | |
1042 | goto out; | |
1043 | } | |
5d9db883 | 1044 | |
310ad754 JK |
1045 | /* length of the variable name itself: remove GUID and separator */ |
1046 | namelen = dentry->d_name.len - GUID_LEN - 1; | |
5d9db883 MG |
1047 | |
1048 | efivarfs_hex_to_guid(dentry->d_name.name + namelen + 1, | |
1049 | &var->var.VendorGuid); | |
1050 | ||
1051 | for (i = 0; i < namelen; i++) | |
1052 | var->var.VariableName[i] = dentry->d_name.name[i]; | |
1053 | ||
1054 | var->var.VariableName[i] = '\0'; | |
1055 | ||
1056 | inode->i_private = var; | |
1057 | var->efivars = efivars; | |
1058 | var->kobj.kset = efivars->kset; | |
1059 | ||
1060 | err = kobject_init_and_add(&var->kobj, &efivar_ktype, NULL, "%s", | |
1061 | dentry->d_name.name); | |
1062 | if (err) | |
1063 | goto out; | |
1064 | ||
1065 | kobject_uevent(&var->kobj, KOBJ_ADD); | |
81fa4e58 | 1066 | spin_lock_irq(&efivars->lock); |
5d9db883 | 1067 | list_add(&var->list, &efivars->list); |
81fa4e58 | 1068 | spin_unlock_irq(&efivars->lock); |
5d9db883 MG |
1069 | d_instantiate(dentry, inode); |
1070 | dget(dentry); | |
1071 | out: | |
45a937a8 | 1072 | if (err) { |
5d9db883 | 1073 | kfree(var); |
45a937a8 AW |
1074 | iput(inode); |
1075 | } | |
5d9db883 MG |
1076 | return err; |
1077 | } | |
1078 | ||
1079 | static int efivarfs_unlink(struct inode *dir, struct dentry *dentry) | |
1080 | { | |
1081 | struct efivar_entry *var = dentry->d_inode->i_private; | |
1082 | struct efivars *efivars = var->efivars; | |
1083 | efi_status_t status; | |
1084 | ||
81fa4e58 | 1085 | spin_lock_irq(&efivars->lock); |
5d9db883 MG |
1086 | |
1087 | status = efivars->ops->set_variable(var->var.VariableName, | |
1088 | &var->var.VendorGuid, | |
1089 | 0, 0, NULL); | |
1090 | ||
1091 | if (status == EFI_SUCCESS || status == EFI_NOT_FOUND) { | |
1092 | list_del(&var->list); | |
81fa4e58 | 1093 | spin_unlock_irq(&efivars->lock); |
5d9db883 | 1094 | efivar_unregister(var); |
de5fe955 | 1095 | drop_nlink(dentry->d_inode); |
5d9db883 MG |
1096 | dput(dentry); |
1097 | return 0; | |
1098 | } | |
1099 | ||
81fa4e58 | 1100 | spin_unlock_irq(&efivars->lock); |
5d9db883 MG |
1101 | return -EINVAL; |
1102 | }; | |
1103 | ||
da27a243 MF |
1104 | /* |
1105 | * Compare two efivarfs file names. | |
1106 | * | |
1107 | * An efivarfs filename is composed of two parts, | |
1108 | * | |
1109 | * 1. A case-sensitive variable name | |
1110 | * 2. A case-insensitive GUID | |
1111 | * | |
1112 | * So we need to perform a case-sensitive match on part 1 and a | |
1113 | * case-insensitive match on part 2. | |
1114 | */ | |
1115 | static int efivarfs_d_compare(const struct dentry *parent, const struct inode *pinode, | |
1116 | const struct dentry *dentry, const struct inode *inode, | |
1117 | unsigned int len, const char *str, | |
1118 | const struct qstr *name) | |
1119 | { | |
1120 | int guid = len - GUID_LEN; | |
1121 | ||
1122 | if (name->len != len) | |
1123 | return 1; | |
1124 | ||
1125 | /* Case-sensitive compare for the variable name */ | |
1126 | if (memcmp(str, name->name, guid)) | |
1127 | return 1; | |
1128 | ||
1129 | /* Case-insensitive compare for the GUID */ | |
1130 | return strncasecmp(name->name + guid, str + guid, GUID_LEN); | |
1131 | } | |
1132 | ||
1133 | static int efivarfs_d_hash(const struct dentry *dentry, | |
1134 | const struct inode *inode, struct qstr *qstr) | |
1135 | { | |
1136 | unsigned long hash = init_name_hash(); | |
1137 | const unsigned char *s = qstr->name; | |
1138 | unsigned int len = qstr->len; | |
1139 | ||
1140 | if (!efivarfs_valid_name(s, len)) | |
1141 | return -EINVAL; | |
1142 | ||
1143 | while (len-- > GUID_LEN) | |
1144 | hash = partial_name_hash(*s++, hash); | |
1145 | ||
1146 | /* GUID is case-insensitive. */ | |
1147 | while (len--) | |
1148 | hash = partial_name_hash(tolower(*s++), hash); | |
1149 | ||
1150 | qstr->hash = end_name_hash(hash); | |
1151 | return 0; | |
1152 | } | |
1153 | ||
1154 | /* | |
1155 | * Retaining negative dentries for an in-memory filesystem just wastes | |
1156 | * memory and lookup time: arrange for them to be deleted immediately. | |
1157 | */ | |
1158 | static int efivarfs_delete_dentry(const struct dentry *dentry) | |
1159 | { | |
1160 | return 1; | |
1161 | } | |
1162 | ||
1163 | static struct dentry_operations efivarfs_d_ops = { | |
1164 | .d_compare = efivarfs_d_compare, | |
1165 | .d_hash = efivarfs_d_hash, | |
1166 | .d_delete = efivarfs_delete_dentry, | |
1167 | }; | |
1168 | ||
1169 | static struct dentry *efivarfs_alloc_dentry(struct dentry *parent, char *name) | |
1170 | { | |
feff5dc4 | 1171 | struct dentry *d; |
da27a243 | 1172 | struct qstr q; |
feff5dc4 | 1173 | int err; |
da27a243 MF |
1174 | |
1175 | q.name = name; | |
1176 | q.len = strlen(name); | |
1177 | ||
feff5dc4 MF |
1178 | err = efivarfs_d_hash(NULL, NULL, &q); |
1179 | if (err) | |
1180 | return ERR_PTR(err); | |
1181 | ||
1182 | d = d_alloc(parent, &q); | |
1183 | if (d) | |
1184 | return d; | |
da27a243 | 1185 | |
feff5dc4 | 1186 | return ERR_PTR(-ENOMEM); |
da27a243 MF |
1187 | } |
1188 | ||
e83af1f1 | 1189 | static int efivarfs_fill_super(struct super_block *sb, void *data, int silent) |
5d9db883 MG |
1190 | { |
1191 | struct inode *inode = NULL; | |
1192 | struct dentry *root; | |
1193 | struct efivar_entry *entry, *n; | |
1194 | struct efivars *efivars = &__efivars; | |
5ba6e291 | 1195 | char *name; |
feff5dc4 | 1196 | int err = -ENOMEM; |
5d9db883 MG |
1197 | |
1198 | efivarfs_sb = sb; | |
1199 | ||
1200 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
1201 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
1202 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
91716322 | 1203 | sb->s_magic = EFIVARFS_MAGIC; |
5d9db883 | 1204 | sb->s_op = &efivarfs_ops; |
da27a243 | 1205 | sb->s_d_op = &efivarfs_d_ops; |
5d9db883 MG |
1206 | sb->s_time_gran = 1; |
1207 | ||
1208 | inode = efivarfs_get_inode(sb, NULL, S_IFDIR | 0755, 0); | |
5c9b50ab AW |
1209 | if (!inode) |
1210 | return -ENOMEM; | |
5d9db883 MG |
1211 | inode->i_op = &efivarfs_dir_inode_operations; |
1212 | ||
1213 | root = d_make_root(inode); | |
1214 | sb->s_root = root; | |
5c9b50ab AW |
1215 | if (!root) |
1216 | return -ENOMEM; | |
5d9db883 MG |
1217 | |
1218 | list_for_each_entry_safe(entry, n, &efivars->list, list) { | |
5d9db883 | 1219 | struct dentry *dentry, *root = efivarfs_sb->s_root; |
5d9db883 MG |
1220 | unsigned long size = 0; |
1221 | int len, i; | |
1222 | ||
5ba6e291 AW |
1223 | inode = NULL; |
1224 | ||
5d9db883 MG |
1225 | len = utf16_strlen(entry->var.VariableName); |
1226 | ||
310ad754 JK |
1227 | /* name, plus '-', plus GUID, plus NUL*/ |
1228 | name = kmalloc(len + 1 + GUID_LEN + 1, GFP_ATOMIC); | |
5ba6e291 AW |
1229 | if (!name) |
1230 | goto fail; | |
5d9db883 MG |
1231 | |
1232 | for (i = 0; i < len; i++) | |
1233 | name[i] = entry->var.VariableName[i] & 0xFF; | |
1234 | ||
1235 | name[len] = '-'; | |
1236 | ||
1237 | efi_guid_unparse(&entry->var.VendorGuid, name + len + 1); | |
1238 | ||
310ad754 | 1239 | name[len+GUID_LEN+1] = '\0'; |
5d9db883 MG |
1240 | |
1241 | inode = efivarfs_get_inode(efivarfs_sb, root->d_inode, | |
1242 | S_IFREG | 0644, 0); | |
5ba6e291 AW |
1243 | if (!inode) |
1244 | goto fail_name; | |
1245 | ||
da27a243 | 1246 | dentry = efivarfs_alloc_dentry(root, name); |
feff5dc4 MF |
1247 | if (IS_ERR(dentry)) { |
1248 | err = PTR_ERR(dentry); | |
5ba6e291 | 1249 | goto fail_inode; |
feff5dc4 | 1250 | } |
5ba6e291 | 1251 | |
c0359db1 AW |
1252 | /* copied by the above to local storage in the dentry. */ |
1253 | kfree(name); | |
5d9db883 | 1254 | |
81fa4e58 | 1255 | spin_lock_irq(&efivars->lock); |
5d9db883 MG |
1256 | efivars->ops->get_variable(entry->var.VariableName, |
1257 | &entry->var.VendorGuid, | |
1258 | &entry->var.Attributes, | |
1259 | &size, | |
1260 | NULL); | |
81fa4e58 | 1261 | spin_unlock_irq(&efivars->lock); |
5d9db883 MG |
1262 | |
1263 | mutex_lock(&inode->i_mutex); | |
1264 | inode->i_private = entry; | |
94a193fb | 1265 | i_size_write(inode, size + sizeof(entry->var.Attributes)); |
5d9db883 MG |
1266 | mutex_unlock(&inode->i_mutex); |
1267 | d_add(dentry, inode); | |
1268 | } | |
1269 | ||
1270 | return 0; | |
5ba6e291 AW |
1271 | |
1272 | fail_inode: | |
1273 | iput(inode); | |
1274 | fail_name: | |
1275 | kfree(name); | |
1276 | fail: | |
feff5dc4 | 1277 | return err; |
5d9db883 MG |
1278 | } |
1279 | ||
1280 | static struct dentry *efivarfs_mount(struct file_system_type *fs_type, | |
1281 | int flags, const char *dev_name, void *data) | |
1282 | { | |
1283 | return mount_single(fs_type, flags, data, efivarfs_fill_super); | |
1284 | } | |
1285 | ||
1286 | static void efivarfs_kill_sb(struct super_block *sb) | |
1287 | { | |
1288 | kill_litter_super(sb); | |
1289 | efivarfs_sb = NULL; | |
1290 | } | |
1291 | ||
1292 | static struct file_system_type efivarfs_type = { | |
1293 | .name = "efivarfs", | |
1294 | .mount = efivarfs_mount, | |
1295 | .kill_sb = efivarfs_kill_sb, | |
1296 | }; | |
7f78e035 | 1297 | MODULE_ALIAS_FS("efivarfs"); |
5d9db883 | 1298 | |
da27a243 MF |
1299 | /* |
1300 | * Handle negative dentry. | |
1301 | */ | |
1302 | static struct dentry *efivarfs_lookup(struct inode *dir, struct dentry *dentry, | |
1303 | unsigned int flags) | |
1304 | { | |
1305 | if (dentry->d_name.len > NAME_MAX) | |
1306 | return ERR_PTR(-ENAMETOOLONG); | |
1307 | d_add(dentry, NULL); | |
1308 | return NULL; | |
1309 | } | |
1310 | ||
5d9db883 | 1311 | static const struct inode_operations efivarfs_dir_inode_operations = { |
da27a243 | 1312 | .lookup = efivarfs_lookup, |
5d9db883 MG |
1313 | .unlink = efivarfs_unlink, |
1314 | .create = efivarfs_create, | |
1315 | }; | |
1316 | ||
ed9dc8ce | 1317 | #ifdef CONFIG_EFI_VARS_PSTORE |
5ee9c198 MG |
1318 | |
1319 | static int efi_pstore_open(struct pstore_info *psi) | |
1320 | { | |
1321 | struct efivars *efivars = psi->data; | |
1322 | ||
81fa4e58 | 1323 | spin_lock_irq(&efivars->lock); |
5ee9c198 MG |
1324 | efivars->walk_entry = list_first_entry(&efivars->list, |
1325 | struct efivar_entry, list); | |
1326 | return 0; | |
1327 | } | |
1328 | ||
1329 | static int efi_pstore_close(struct pstore_info *psi) | |
1330 | { | |
1331 | struct efivars *efivars = psi->data; | |
1332 | ||
81fa4e58 | 1333 | spin_unlock_irq(&efivars->lock); |
5ee9c198 MG |
1334 | return 0; |
1335 | } | |
1336 | ||
1337 | static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, | |
755d4fe4 | 1338 | int *count, struct timespec *timespec, |
f6f82851 | 1339 | char **buf, struct pstore_info *psi) |
5ee9c198 MG |
1340 | { |
1341 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; | |
1342 | struct efivars *efivars = psi->data; | |
1343 | char name[DUMP_NAME_LEN]; | |
1344 | int i; | |
755d4fe4 | 1345 | int cnt; |
5ee9c198 MG |
1346 | unsigned int part, size; |
1347 | unsigned long time; | |
1348 | ||
1349 | while (&efivars->walk_entry->list != &efivars->list) { | |
1350 | if (!efi_guidcmp(efivars->walk_entry->var.VendorGuid, | |
1351 | vendor)) { | |
1352 | for (i = 0; i < DUMP_NAME_LEN; i++) { | |
1353 | name[i] = efivars->walk_entry->var.VariableName[i]; | |
1354 | } | |
755d4fe4 SA |
1355 | if (sscanf(name, "dump-type%u-%u-%d-%lu", |
1356 | type, &part, &cnt, &time) == 4) { | |
5ee9c198 | 1357 | *id = part; |
755d4fe4 | 1358 | *count = cnt; |
5ee9c198 MG |
1359 | timespec->tv_sec = time; |
1360 | timespec->tv_nsec = 0; | |
0f7de85a SA |
1361 | } else if (sscanf(name, "dump-type%u-%u-%lu", |
1362 | type, &part, &time) == 3) { | |
1363 | /* | |
1364 | * Check if an old format, | |
1365 | * which doesn't support holding | |
1366 | * multiple logs, remains. | |
1367 | */ | |
1368 | *id = part; | |
1369 | *count = 0; | |
1370 | timespec->tv_sec = time; | |
1371 | timespec->tv_nsec = 0; | |
1372 | } else { | |
1373 | efivars->walk_entry = list_entry( | |
1374 | efivars->walk_entry->list.next, | |
1375 | struct efivar_entry, list); | |
1376 | continue; | |
5ee9c198 | 1377 | } |
0f7de85a SA |
1378 | |
1379 | get_var_data_locked(efivars, &efivars->walk_entry->var); | |
1380 | size = efivars->walk_entry->var.DataSize; | |
1381 | *buf = kmalloc(size, GFP_KERNEL); | |
1382 | if (*buf == NULL) | |
1383 | return -ENOMEM; | |
1384 | memcpy(*buf, efivars->walk_entry->var.Data, | |
1385 | size); | |
1386 | efivars->walk_entry = list_entry( | |
1387 | efivars->walk_entry->list.next, | |
1388 | struct efivar_entry, list); | |
1389 | return size; | |
5ee9c198 MG |
1390 | } |
1391 | efivars->walk_entry = list_entry(efivars->walk_entry->list.next, | |
1392 | struct efivar_entry, list); | |
1393 | } | |
1394 | return 0; | |
1395 | } | |
1396 | ||
3d6d8d20 KC |
1397 | static int efi_pstore_write(enum pstore_type_id type, |
1398 | enum kmsg_dump_reason reason, u64 *id, | |
755d4fe4 SA |
1399 | unsigned int part, int count, size_t size, |
1400 | struct pstore_info *psi) | |
5ee9c198 MG |
1401 | { |
1402 | char name[DUMP_NAME_LEN]; | |
5ee9c198 MG |
1403 | efi_char16_t efi_name[DUMP_NAME_LEN]; |
1404 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; | |
1405 | struct efivars *efivars = psi->data; | |
b238b8fa | 1406 | int i, ret = 0; |
d80a361d | 1407 | efi_status_t status = EFI_NOT_FOUND; |
81fa4e58 | 1408 | unsigned long flags; |
5ee9c198 | 1409 | |
e59310ad SA |
1410 | if (pstore_cannot_block_path(reason)) { |
1411 | /* | |
1412 | * If the lock is taken by another cpu in non-blocking path, | |
1413 | * this driver returns without entering firmware to avoid | |
1414 | * hanging up. | |
1415 | */ | |
81fa4e58 | 1416 | if (!spin_trylock_irqsave(&efivars->lock, flags)) |
e59310ad SA |
1417 | return -EBUSY; |
1418 | } else | |
81fa4e58 | 1419 | spin_lock_irqsave(&efivars->lock, flags); |
5ee9c198 | 1420 | |
d80a361d SA |
1421 | /* |
1422 | * Check if there is a space enough to log. | |
1423 | * size: a size of logging data | |
1424 | * DUMP_NAME_LEN * 2: a maximum size of variable name | |
1425 | */ | |
68d92986 MG |
1426 | |
1427 | status = check_var_size_locked(efivars, PSTORE_EFI_ATTRIBUTES, | |
1428 | size + DUMP_NAME_LEN * 2); | |
1429 | ||
1430 | if (status) { | |
81fa4e58 | 1431 | spin_unlock_irqrestore(&efivars->lock, flags); |
d80a361d SA |
1432 | *id = part; |
1433 | return -ENOSPC; | |
1434 | } | |
1435 | ||
755d4fe4 | 1436 | sprintf(name, "dump-type%u-%u-%d-%lu", type, part, count, |
96480d9c | 1437 | get_seconds()); |
5ee9c198 MG |
1438 | |
1439 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
1440 | efi_name[i] = name[i]; | |
1441 | ||
7644c16c | 1442 | efivars->ops->set_variable(efi_name, &vendor, PSTORE_EFI_ATTRIBUTES, |
5ee9c198 MG |
1443 | size, psi->buf); |
1444 | ||
81fa4e58 | 1445 | spin_unlock_irqrestore(&efivars->lock, flags); |
5ee9c198 | 1446 | |
a93bc0c6 SA |
1447 | if (reason == KMSG_DUMP_OOPS) |
1448 | schedule_work(&efivar_work); | |
5ee9c198 | 1449 | |
b238b8fa CG |
1450 | *id = part; |
1451 | return ret; | |
5ee9c198 MG |
1452 | }; |
1453 | ||
755d4fe4 | 1454 | static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count, |
a9efd39c | 1455 | struct timespec time, struct pstore_info *psi) |
5ee9c198 | 1456 | { |
a9efd39c | 1457 | char name[DUMP_NAME_LEN]; |
dd230fec | 1458 | efi_char16_t efi_name[DUMP_NAME_LEN]; |
f94ec0c0 SA |
1459 | char name_old[DUMP_NAME_LEN]; |
1460 | efi_char16_t efi_name_old[DUMP_NAME_LEN]; | |
dd230fec SA |
1461 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; |
1462 | struct efivars *efivars = psi->data; | |
1463 | struct efivar_entry *entry, *found = NULL; | |
1464 | int i; | |
1465 | ||
755d4fe4 | 1466 | sprintf(name, "dump-type%u-%u-%d-%lu", type, (unsigned int)id, count, |
a9efd39c | 1467 | time.tv_sec); |
dd230fec | 1468 | |
81fa4e58 | 1469 | spin_lock_irq(&efivars->lock); |
dd230fec SA |
1470 | |
1471 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
a9efd39c | 1472 | efi_name[i] = name[i]; |
dd230fec SA |
1473 | |
1474 | /* | |
a9efd39c | 1475 | * Clean up an entry with the same name |
dd230fec SA |
1476 | */ |
1477 | ||
1478 | list_for_each_entry(entry, &efivars->list, list) { | |
1479 | get_var_data_locked(efivars, &entry->var); | |
1480 | ||
1481 | if (efi_guidcmp(entry->var.VendorGuid, vendor)) | |
1482 | continue; | |
1483 | if (utf16_strncmp(entry->var.VariableName, efi_name, | |
f94ec0c0 SA |
1484 | utf16_strlen(efi_name))) { |
1485 | /* | |
1486 | * Check if an old format, | |
1487 | * which doesn't support holding | |
1488 | * multiple logs, remains. | |
1489 | */ | |
1490 | sprintf(name_old, "dump-type%u-%u-%lu", type, | |
1491 | (unsigned int)id, time.tv_sec); | |
1492 | ||
1493 | for (i = 0; i < DUMP_NAME_LEN; i++) | |
1494 | efi_name_old[i] = name_old[i]; | |
1495 | ||
1496 | if (utf16_strncmp(entry->var.VariableName, efi_name_old, | |
1497 | utf16_strlen(efi_name_old))) | |
1498 | continue; | |
1499 | } | |
dd230fec SA |
1500 | |
1501 | /* found */ | |
1502 | found = entry; | |
1503 | efivars->ops->set_variable(entry->var.VariableName, | |
1504 | &entry->var.VendorGuid, | |
1505 | PSTORE_EFI_ATTRIBUTES, | |
1506 | 0, NULL); | |
a9efd39c | 1507 | break; |
dd230fec SA |
1508 | } |
1509 | ||
1510 | if (found) | |
1511 | list_del(&found->list); | |
1512 | ||
81fa4e58 | 1513 | spin_unlock_irq(&efivars->lock); |
dd230fec SA |
1514 | |
1515 | if (found) | |
1516 | efivar_unregister(found); | |
5ee9c198 MG |
1517 | |
1518 | return 0; | |
1519 | } | |
5ee9c198 MG |
1520 | |
1521 | static struct pstore_info efi_pstore_info = { | |
1522 | .owner = THIS_MODULE, | |
1523 | .name = "efi", | |
1524 | .open = efi_pstore_open, | |
1525 | .close = efi_pstore_close, | |
1526 | .read = efi_pstore_read, | |
1527 | .write = efi_pstore_write, | |
1528 | .erase = efi_pstore_erase, | |
1529 | }; | |
1da177e4 | 1530 | |
ed9dc8ce SF |
1531 | static void efivar_pstore_register(struct efivars *efivars) |
1532 | { | |
1533 | efivars->efi_pstore_info = efi_pstore_info; | |
1534 | efivars->efi_pstore_info.buf = kmalloc(4096, GFP_KERNEL); | |
1535 | if (efivars->efi_pstore_info.buf) { | |
1536 | efivars->efi_pstore_info.bufsize = 1024; | |
1537 | efivars->efi_pstore_info.data = efivars; | |
1538 | spin_lock_init(&efivars->efi_pstore_info.buf_lock); | |
1539 | pstore_register(&efivars->efi_pstore_info); | |
1540 | } | |
1541 | } | |
1542 | #else | |
1543 | static void efivar_pstore_register(struct efivars *efivars) | |
1544 | { | |
1545 | return; | |
1546 | } | |
1547 | #endif | |
1548 | ||
2c3c8bea | 1549 | static ssize_t efivar_create(struct file *filp, struct kobject *kobj, |
97fa5bb7 GKH |
1550 | struct bin_attribute *bin_attr, |
1551 | char *buf, loff_t pos, size_t count) | |
1da177e4 LT |
1552 | { |
1553 | struct efi_variable *new_var = (struct efi_variable *)buf; | |
4142ef14 | 1554 | struct efivars *efivars = bin_attr->private; |
496a0fc8 | 1555 | struct efivar_entry *search_efivar, *n; |
1da177e4 | 1556 | unsigned long strsize1, strsize2; |
1da177e4 LT |
1557 | efi_status_t status = EFI_NOT_FOUND; |
1558 | int found = 0; | |
1559 | ||
1560 | if (!capable(CAP_SYS_ADMIN)) | |
1561 | return -EACCES; | |
1562 | ||
fec6c20b MG |
1563 | if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 || |
1564 | validate_var(new_var, new_var->Data, new_var->DataSize) == false) { | |
1565 | printk(KERN_ERR "efivars: Malformed variable content\n"); | |
1566 | return -EINVAL; | |
1567 | } | |
1568 | ||
81fa4e58 | 1569 | spin_lock_irq(&efivars->lock); |
1da177e4 LT |
1570 | |
1571 | /* | |
1572 | * Does this variable already exist? | |
1573 | */ | |
29422693 | 1574 | list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
a2940908 MW |
1575 | strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); |
1576 | strsize2 = utf16_strsize(new_var->VariableName, 1024); | |
1da177e4 LT |
1577 | if (strsize1 == strsize2 && |
1578 | !memcmp(&(search_efivar->var.VariableName), | |
1579 | new_var->VariableName, strsize1) && | |
1580 | !efi_guidcmp(search_efivar->var.VendorGuid, | |
1581 | new_var->VendorGuid)) { | |
1582 | found = 1; | |
1583 | break; | |
1584 | } | |
1585 | } | |
1586 | if (found) { | |
81fa4e58 | 1587 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1588 | return -EINVAL; |
1589 | } | |
1590 | ||
68d92986 MG |
1591 | status = check_var_size_locked(efivars, new_var->Attributes, |
1592 | new_var->DataSize + utf16_strsize(new_var->VariableName, 1024)); | |
1593 | ||
1594 | if (status && status != EFI_UNSUPPORTED) { | |
1595 | spin_unlock_irq(&efivars->lock); | |
1596 | return efi_status_to_err(status); | |
1597 | } | |
1598 | ||
1da177e4 | 1599 | /* now *really* create the variable via EFI */ |
3295814d MW |
1600 | status = efivars->ops->set_variable(new_var->VariableName, |
1601 | &new_var->VendorGuid, | |
1602 | new_var->Attributes, | |
1603 | new_var->DataSize, | |
1604 | new_var->Data); | |
1da177e4 LT |
1605 | |
1606 | if (status != EFI_SUCCESS) { | |
1607 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
1608 | status); | |
81fa4e58 | 1609 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1610 | return -EIO; |
1611 | } | |
81fa4e58 | 1612 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1613 | |
1614 | /* Create the entry in sysfs. Locking is not required here */ | |
4142ef14 | 1615 | status = efivar_create_sysfs_entry(efivars, |
a2940908 MW |
1616 | utf16_strsize(new_var->VariableName, |
1617 | 1024), | |
4142ef14 MW |
1618 | new_var->VariableName, |
1619 | &new_var->VendorGuid); | |
1da177e4 LT |
1620 | if (status) { |
1621 | printk(KERN_WARNING "efivars: variable created, but sysfs entry wasn't.\n"); | |
1622 | } | |
1623 | return count; | |
1624 | } | |
1625 | ||
2c3c8bea | 1626 | static ssize_t efivar_delete(struct file *filp, struct kobject *kobj, |
97fa5bb7 GKH |
1627 | struct bin_attribute *bin_attr, |
1628 | char *buf, loff_t pos, size_t count) | |
1da177e4 LT |
1629 | { |
1630 | struct efi_variable *del_var = (struct efi_variable *)buf; | |
4142ef14 | 1631 | struct efivars *efivars = bin_attr->private; |
496a0fc8 | 1632 | struct efivar_entry *search_efivar, *n; |
1da177e4 | 1633 | unsigned long strsize1, strsize2; |
1da177e4 LT |
1634 | efi_status_t status = EFI_NOT_FOUND; |
1635 | int found = 0; | |
1636 | ||
1637 | if (!capable(CAP_SYS_ADMIN)) | |
1638 | return -EACCES; | |
1639 | ||
81fa4e58 | 1640 | spin_lock_irq(&efivars->lock); |
1da177e4 LT |
1641 | |
1642 | /* | |
1643 | * Does this variable already exist? | |
1644 | */ | |
29422693 | 1645 | list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
a2940908 MW |
1646 | strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); |
1647 | strsize2 = utf16_strsize(del_var->VariableName, 1024); | |
1da177e4 LT |
1648 | if (strsize1 == strsize2 && |
1649 | !memcmp(&(search_efivar->var.VariableName), | |
1650 | del_var->VariableName, strsize1) && | |
1651 | !efi_guidcmp(search_efivar->var.VendorGuid, | |
1652 | del_var->VendorGuid)) { | |
1653 | found = 1; | |
1654 | break; | |
1655 | } | |
1656 | } | |
1657 | if (!found) { | |
81fa4e58 | 1658 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1659 | return -EINVAL; |
1660 | } | |
1661 | /* force the Attributes/DataSize to 0 to ensure deletion */ | |
1662 | del_var->Attributes = 0; | |
1663 | del_var->DataSize = 0; | |
1664 | ||
3295814d MW |
1665 | status = efivars->ops->set_variable(del_var->VariableName, |
1666 | &del_var->VendorGuid, | |
1667 | del_var->Attributes, | |
1668 | del_var->DataSize, | |
1669 | del_var->Data); | |
1da177e4 LT |
1670 | |
1671 | if (status != EFI_SUCCESS) { | |
1672 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", | |
1673 | status); | |
81fa4e58 | 1674 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1675 | return -EIO; |
1676 | } | |
496a0fc8 | 1677 | list_del(&search_efivar->list); |
1da177e4 | 1678 | /* We need to release this lock before unregistering. */ |
81fa4e58 | 1679 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1680 | efivar_unregister(search_efivar); |
1681 | ||
1682 | /* It's dead Jim.... */ | |
1683 | return count; | |
1684 | } | |
1685 | ||
a93bc0c6 SA |
1686 | static bool variable_is_present(efi_char16_t *variable_name, efi_guid_t *vendor) |
1687 | { | |
1688 | struct efivar_entry *entry, *n; | |
1689 | struct efivars *efivars = &__efivars; | |
1690 | unsigned long strsize1, strsize2; | |
1691 | bool found = false; | |
1692 | ||
1693 | strsize1 = utf16_strsize(variable_name, 1024); | |
1694 | list_for_each_entry_safe(entry, n, &efivars->list, list) { | |
1695 | strsize2 = utf16_strsize(entry->var.VariableName, 1024); | |
1696 | if (strsize1 == strsize2 && | |
1697 | !memcmp(variable_name, &(entry->var.VariableName), | |
1698 | strsize2) && | |
1699 | !efi_guidcmp(entry->var.VendorGuid, | |
1700 | *vendor)) { | |
1701 | found = true; | |
1702 | break; | |
1703 | } | |
1704 | } | |
1705 | return found; | |
1706 | } | |
1707 | ||
ec50bd32 MF |
1708 | /* |
1709 | * Returns the size of variable_name, in bytes, including the | |
1710 | * terminating NULL character, or variable_name_size if no NULL | |
1711 | * character is found among the first variable_name_size bytes. | |
1712 | */ | |
1713 | static unsigned long var_name_strnsize(efi_char16_t *variable_name, | |
1714 | unsigned long variable_name_size) | |
1715 | { | |
1716 | unsigned long len; | |
1717 | efi_char16_t c; | |
1718 | ||
1719 | /* | |
1720 | * The variable name is, by definition, a NULL-terminated | |
1721 | * string, so make absolutely sure that variable_name_size is | |
1722 | * the value we expect it to be. If not, return the real size. | |
1723 | */ | |
1724 | for (len = 2; len <= variable_name_size; len += sizeof(c)) { | |
1725 | c = variable_name[(len / sizeof(c)) - 1]; | |
1726 | if (!c) | |
1727 | break; | |
1728 | } | |
1729 | ||
1730 | return min(len, variable_name_size); | |
1731 | } | |
1732 | ||
a93bc0c6 SA |
1733 | static void efivar_update_sysfs_entries(struct work_struct *work) |
1734 | { | |
1735 | struct efivars *efivars = &__efivars; | |
1736 | efi_guid_t vendor; | |
1737 | efi_char16_t *variable_name; | |
1738 | unsigned long variable_name_size = 1024; | |
1739 | efi_status_t status = EFI_NOT_FOUND; | |
1740 | bool found; | |
1741 | ||
1742 | /* Add new sysfs entries */ | |
1743 | while (1) { | |
1744 | variable_name = kzalloc(variable_name_size, GFP_KERNEL); | |
1745 | if (!variable_name) { | |
1746 | pr_err("efivars: Memory allocation failed.\n"); | |
1747 | return; | |
1748 | } | |
1749 | ||
1750 | spin_lock_irq(&efivars->lock); | |
1751 | found = false; | |
1752 | while (1) { | |
1753 | variable_name_size = 1024; | |
1754 | status = efivars->ops->get_next_variable( | |
1755 | &variable_name_size, | |
1756 | variable_name, | |
1757 | &vendor); | |
1758 | if (status != EFI_SUCCESS) { | |
1759 | break; | |
1760 | } else { | |
1761 | if (!variable_is_present(variable_name, | |
1762 | &vendor)) { | |
1763 | found = true; | |
1764 | break; | |
1765 | } | |
1766 | } | |
1767 | } | |
1768 | spin_unlock_irq(&efivars->lock); | |
1769 | ||
1770 | if (!found) { | |
1771 | kfree(variable_name); | |
1772 | break; | |
ec50bd32 MF |
1773 | } else { |
1774 | variable_name_size = var_name_strnsize(variable_name, | |
1775 | variable_name_size); | |
a93bc0c6 SA |
1776 | efivar_create_sysfs_entry(efivars, |
1777 | variable_name_size, | |
1778 | variable_name, &vendor); | |
ec50bd32 | 1779 | } |
a93bc0c6 SA |
1780 | } |
1781 | } | |
1782 | ||
1da177e4 LT |
1783 | /* |
1784 | * Let's not leave out systab information that snuck into | |
1785 | * the efivars driver | |
1786 | */ | |
334c6307 GKH |
1787 | static ssize_t systab_show(struct kobject *kobj, |
1788 | struct kobj_attribute *attr, char *buf) | |
1da177e4 LT |
1789 | { |
1790 | char *str = buf; | |
1791 | ||
334c6307 | 1792 | if (!kobj || !buf) |
1da177e4 LT |
1793 | return -EINVAL; |
1794 | ||
b2c99e3c BH |
1795 | if (efi.mps != EFI_INVALID_TABLE_ADDR) |
1796 | str += sprintf(str, "MPS=0x%lx\n", efi.mps); | |
1797 | if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) | |
1798 | str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20); | |
1799 | if (efi.acpi != EFI_INVALID_TABLE_ADDR) | |
1800 | str += sprintf(str, "ACPI=0x%lx\n", efi.acpi); | |
1801 | if (efi.smbios != EFI_INVALID_TABLE_ADDR) | |
1802 | str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios); | |
1803 | if (efi.hcdp != EFI_INVALID_TABLE_ADDR) | |
1804 | str += sprintf(str, "HCDP=0x%lx\n", efi.hcdp); | |
1805 | if (efi.boot_info != EFI_INVALID_TABLE_ADDR) | |
1806 | str += sprintf(str, "BOOTINFO=0x%lx\n", efi.boot_info); | |
1807 | if (efi.uga != EFI_INVALID_TABLE_ADDR) | |
1808 | str += sprintf(str, "UGA=0x%lx\n", efi.uga); | |
1da177e4 LT |
1809 | |
1810 | return str - buf; | |
1811 | } | |
1812 | ||
334c6307 GKH |
1813 | static struct kobj_attribute efi_attr_systab = |
1814 | __ATTR(systab, 0400, systab_show, NULL); | |
1da177e4 | 1815 | |
334c6307 GKH |
1816 | static struct attribute *efi_subsys_attrs[] = { |
1817 | &efi_attr_systab.attr, | |
1da177e4 LT |
1818 | NULL, /* maybe more in the future? */ |
1819 | }; | |
1820 | ||
334c6307 GKH |
1821 | static struct attribute_group efi_subsys_attr_group = { |
1822 | .attrs = efi_subsys_attrs, | |
1823 | }; | |
1824 | ||
bc87d2fe | 1825 | static struct kobject *efi_kobj; |
1da177e4 LT |
1826 | |
1827 | /* | |
1828 | * efivar_create_sysfs_entry() | |
1829 | * Requires: | |
1830 | * variable_name_size = number of bytes required to hold | |
1831 | * variable_name (not counting the NULL | |
1832 | * character at the end. | |
29422693 | 1833 | * efivars->lock is not held on entry or exit. |
1da177e4 LT |
1834 | * Returns 1 on failure, 0 on success |
1835 | */ | |
1836 | static int | |
4142ef14 MW |
1837 | efivar_create_sysfs_entry(struct efivars *efivars, |
1838 | unsigned long variable_name_size, | |
1839 | efi_char16_t *variable_name, | |
1840 | efi_guid_t *vendor_guid) | |
1da177e4 | 1841 | { |
310ad754 | 1842 | int i, short_name_size; |
1da177e4 LT |
1843 | char *short_name; |
1844 | struct efivar_entry *new_efivar; | |
1845 | ||
310ad754 JK |
1846 | /* |
1847 | * Length of the variable bytes in ASCII, plus the '-' separator, | |
1848 | * plus the GUID, plus trailing NUL | |
1849 | */ | |
1850 | short_name_size = variable_name_size / sizeof(efi_char16_t) | |
1851 | + 1 + GUID_LEN + 1; | |
1852 | ||
1853 | short_name = kzalloc(short_name_size, GFP_KERNEL); | |
9c215384 | 1854 | new_efivar = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL); |
1da177e4 LT |
1855 | |
1856 | if (!short_name || !new_efivar) { | |
0933ad9c JJ |
1857 | kfree(short_name); |
1858 | kfree(new_efivar); | |
1da177e4 LT |
1859 | return 1; |
1860 | } | |
1da177e4 | 1861 | |
4142ef14 | 1862 | new_efivar->efivars = efivars; |
1da177e4 LT |
1863 | memcpy(new_efivar->var.VariableName, variable_name, |
1864 | variable_name_size); | |
1865 | memcpy(&(new_efivar->var.VendorGuid), vendor_guid, sizeof(efi_guid_t)); | |
1866 | ||
1867 | /* Convert Unicode to normal chars (assume top bits are 0), | |
1868 | ala UTF-8 */ | |
1869 | for (i=0; i < (int)(variable_name_size / sizeof(efi_char16_t)); i++) { | |
1870 | short_name[i] = variable_name[i] & 0xFF; | |
1871 | } | |
1872 | /* This is ugly, but necessary to separate one vendor's | |
1873 | private variables from another's. */ | |
1874 | ||
1875 | *(short_name + strlen(short_name)) = '-'; | |
1876 | efi_guid_unparse(vendor_guid, short_name + strlen(short_name)); | |
1877 | ||
29422693 | 1878 | new_efivar->kobj.kset = efivars->kset; |
d6d292c4 GKH |
1879 | i = kobject_init_and_add(&new_efivar->kobj, &efivar_ktype, NULL, |
1880 | "%s", short_name); | |
69b2186c JG |
1881 | if (i) { |
1882 | kfree(short_name); | |
1883 | kfree(new_efivar); | |
1884 | return 1; | |
1885 | } | |
1da177e4 | 1886 | |
d6d292c4 | 1887 | kobject_uevent(&new_efivar->kobj, KOBJ_ADD); |
0933ad9c JJ |
1888 | kfree(short_name); |
1889 | short_name = NULL; | |
1da177e4 | 1890 | |
81fa4e58 | 1891 | spin_lock_irq(&efivars->lock); |
29422693 | 1892 | list_add(&new_efivar->list, &efivars->list); |
81fa4e58 | 1893 | spin_unlock_irq(&efivars->lock); |
1da177e4 LT |
1894 | |
1895 | return 0; | |
1896 | } | |
d502fbb0 MW |
1897 | |
1898 | static int | |
1899 | create_efivars_bin_attributes(struct efivars *efivars) | |
1900 | { | |
1901 | struct bin_attribute *attr; | |
1902 | int error; | |
1903 | ||
1904 | /* new_var */ | |
1905 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
1906 | if (!attr) | |
1907 | return -ENOMEM; | |
1908 | ||
1909 | attr->attr.name = "new_var"; | |
1910 | attr->attr.mode = 0200; | |
1911 | attr->write = efivar_create; | |
1912 | attr->private = efivars; | |
1913 | efivars->new_var = attr; | |
1914 | ||
1915 | /* del_var */ | |
1916 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
1917 | if (!attr) { | |
1918 | error = -ENOMEM; | |
1919 | goto out_free; | |
1920 | } | |
1921 | attr->attr.name = "del_var"; | |
1922 | attr->attr.mode = 0200; | |
1923 | attr->write = efivar_delete; | |
1924 | attr->private = efivars; | |
1925 | efivars->del_var = attr; | |
1926 | ||
1927 | sysfs_bin_attr_init(efivars->new_var); | |
1928 | sysfs_bin_attr_init(efivars->del_var); | |
1929 | ||
1930 | /* Register */ | |
1931 | error = sysfs_create_bin_file(&efivars->kset->kobj, | |
1932 | efivars->new_var); | |
1933 | if (error) { | |
1934 | printk(KERN_ERR "efivars: unable to create new_var sysfs file" | |
1935 | " due to error %d\n", error); | |
1936 | goto out_free; | |
1937 | } | |
1938 | error = sysfs_create_bin_file(&efivars->kset->kobj, | |
1939 | efivars->del_var); | |
1940 | if (error) { | |
1941 | printk(KERN_ERR "efivars: unable to create del_var sysfs file" | |
1942 | " due to error %d\n", error); | |
1943 | sysfs_remove_bin_file(&efivars->kset->kobj, | |
1944 | efivars->new_var); | |
1945 | goto out_free; | |
1946 | } | |
1947 | ||
1948 | return 0; | |
1949 | out_free: | |
051d51bc DC |
1950 | kfree(efivars->del_var); |
1951 | efivars->del_var = NULL; | |
d502fbb0 MW |
1952 | kfree(efivars->new_var); |
1953 | efivars->new_var = NULL; | |
1954 | return error; | |
1955 | } | |
1956 | ||
4fc756bd | 1957 | void unregister_efivars(struct efivars *efivars) |
76b53f7c MW |
1958 | { |
1959 | struct efivar_entry *entry, *n; | |
4142ef14 | 1960 | |
76b53f7c | 1961 | list_for_each_entry_safe(entry, n, &efivars->list, list) { |
81fa4e58 | 1962 | spin_lock_irq(&efivars->lock); |
76b53f7c | 1963 | list_del(&entry->list); |
81fa4e58 | 1964 | spin_unlock_irq(&efivars->lock); |
76b53f7c MW |
1965 | efivar_unregister(entry); |
1966 | } | |
1967 | if (efivars->new_var) | |
1968 | sysfs_remove_bin_file(&efivars->kset->kobj, efivars->new_var); | |
1969 | if (efivars->del_var) | |
1970 | sysfs_remove_bin_file(&efivars->kset->kobj, efivars->del_var); | |
1971 | kfree(efivars->new_var); | |
1972 | kfree(efivars->del_var); | |
605e70c7 | 1973 | kobject_put(efivars->kobject); |
76b53f7c MW |
1974 | kset_unregister(efivars->kset); |
1975 | } | |
4fc756bd | 1976 | EXPORT_SYMBOL_GPL(unregister_efivars); |
1da177e4 | 1977 | |
4fc756bd MW |
1978 | int register_efivars(struct efivars *efivars, |
1979 | const struct efivar_operations *ops, | |
1980 | struct kobject *parent_kobj) | |
1da177e4 LT |
1981 | { |
1982 | efi_status_t status = EFI_NOT_FOUND; | |
1983 | efi_guid_t vendor_guid; | |
1984 | efi_char16_t *variable_name; | |
1da177e4 | 1985 | unsigned long variable_name_size = 1024; |
334c6307 | 1986 | int error = 0; |
1da177e4 | 1987 | |
9c215384 | 1988 | variable_name = kzalloc(variable_name_size, GFP_KERNEL); |
1da177e4 LT |
1989 | if (!variable_name) { |
1990 | printk(KERN_ERR "efivars: Memory allocation failed.\n"); | |
1991 | return -ENOMEM; | |
1992 | } | |
1993 | ||
29422693 MW |
1994 | spin_lock_init(&efivars->lock); |
1995 | INIT_LIST_HEAD(&efivars->list); | |
3295814d | 1996 | efivars->ops = ops; |
29422693 | 1997 | |
76b53f7c | 1998 | efivars->kset = kset_create_and_add("vars", NULL, parent_kobj); |
29422693 | 1999 | if (!efivars->kset) { |
66ac831e GKH |
2000 | printk(KERN_ERR "efivars: Subsystem registration failed.\n"); |
2001 | error = -ENOMEM; | |
76b53f7c | 2002 | goto out; |
1da177e4 LT |
2003 | } |
2004 | ||
605e70c7 LCY |
2005 | efivars->kobject = kobject_create_and_add("efivars", parent_kobj); |
2006 | if (!efivars->kobject) { | |
2007 | pr_err("efivars: Subsystem registration failed.\n"); | |
2008 | error = -ENOMEM; | |
2009 | kset_unregister(efivars->kset); | |
2010 | goto out; | |
2011 | } | |
2012 | ||
1da177e4 LT |
2013 | /* |
2014 | * Per EFI spec, the maximum storage allocated for both | |
2015 | * the variable name and variable data is 1024 bytes. | |
2016 | */ | |
2017 | ||
2018 | do { | |
2019 | variable_name_size = 1024; | |
2020 | ||
3295814d | 2021 | status = ops->get_next_variable(&variable_name_size, |
1da177e4 LT |
2022 | variable_name, |
2023 | &vendor_guid); | |
2024 | switch (status) { | |
2025 | case EFI_SUCCESS: | |
ec50bd32 MF |
2026 | variable_name_size = var_name_strnsize(variable_name, |
2027 | variable_name_size); | |
4142ef14 MW |
2028 | efivar_create_sysfs_entry(efivars, |
2029 | variable_name_size, | |
2030 | variable_name, | |
2031 | &vendor_guid); | |
1da177e4 LT |
2032 | break; |
2033 | case EFI_NOT_FOUND: | |
2034 | break; | |
2035 | default: | |
2036 | printk(KERN_WARNING "efivars: get_next_variable: status=%lx\n", | |
2037 | status); | |
2038 | status = EFI_NOT_FOUND; | |
2039 | break; | |
2040 | } | |
2041 | } while (status != EFI_NOT_FOUND); | |
2042 | ||
d502fbb0 | 2043 | error = create_efivars_bin_attributes(efivars); |
1da177e4 | 2044 | if (error) |
76b53f7c | 2045 | unregister_efivars(efivars); |
1da177e4 | 2046 | |
ec0971ba SF |
2047 | if (!efivars_pstore_disable) |
2048 | efivar_pstore_register(efivars); | |
5ee9c198 | 2049 | |
5d9db883 MG |
2050 | register_filesystem(&efivarfs_type); |
2051 | ||
76b53f7c MW |
2052 | out: |
2053 | kfree(variable_name); | |
1da177e4 | 2054 | |
76b53f7c MW |
2055 | return error; |
2056 | } | |
4fc756bd | 2057 | EXPORT_SYMBOL_GPL(register_efivars); |
1da177e4 | 2058 | |
76b53f7c MW |
2059 | /* |
2060 | * For now we register the efi subsystem with the firmware subsystem | |
2061 | * and the vars subsystem with the efi subsystem. In the future, it | |
2062 | * might make sense to split off the efi subsystem into its own | |
2063 | * driver, but for now only efivars will register with it, so just | |
2064 | * include it here. | |
2065 | */ | |
2066 | ||
2067 | static int __init | |
2068 | efivars_init(void) | |
2069 | { | |
2070 | int error = 0; | |
2071 | ||
2072 | printk(KERN_INFO "EFI Variables Facility v%s %s\n", EFIVARS_VERSION, | |
2073 | EFIVARS_DATE); | |
2074 | ||
83e68189 | 2075 | if (!efi_enabled(EFI_RUNTIME_SERVICES)) |
4fc756bd | 2076 | return 0; |
76b53f7c MW |
2077 | |
2078 | /* For now we'll register the efi directory at /sys/firmware/efi */ | |
2079 | efi_kobj = kobject_create_and_add("efi", firmware_kobj); | |
2080 | if (!efi_kobj) { | |
2081 | printk(KERN_ERR "efivars: Firmware registration failed.\n"); | |
2082 | return -ENOMEM; | |
2083 | } | |
2084 | ||
3295814d MW |
2085 | ops.get_variable = efi.get_variable; |
2086 | ops.set_variable = efi.set_variable; | |
2087 | ops.get_next_variable = efi.get_next_variable; | |
d80a361d | 2088 | ops.query_variable_info = efi.query_variable_info; |
89d16665 | 2089 | |
3295814d | 2090 | error = register_efivars(&__efivars, &ops, efi_kobj); |
3116aabc DC |
2091 | if (error) |
2092 | goto err_put; | |
76b53f7c MW |
2093 | |
2094 | /* Don't forget the systab entry */ | |
2095 | error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group); | |
2096 | if (error) { | |
2097 | printk(KERN_ERR | |
2098 | "efivars: Sysfs attribute export failed with error %d.\n", | |
2099 | error); | |
3116aabc | 2100 | goto err_unregister; |
76b53f7c | 2101 | } |
1da177e4 | 2102 | |
3116aabc DC |
2103 | return 0; |
2104 | ||
2105 | err_unregister: | |
2106 | unregister_efivars(&__efivars); | |
2107 | err_put: | |
2108 | kobject_put(efi_kobj); | |
1da177e4 LT |
2109 | return error; |
2110 | } | |
2111 | ||
2112 | static void __exit | |
2113 | efivars_exit(void) | |
2114 | { | |
a93bc0c6 SA |
2115 | cancel_work_sync(&efivar_work); |
2116 | ||
83e68189 | 2117 | if (efi_enabled(EFI_RUNTIME_SERVICES)) { |
aabb6e15 RD |
2118 | unregister_efivars(&__efivars); |
2119 | kobject_put(efi_kobj); | |
2120 | } | |
1da177e4 LT |
2121 | } |
2122 | ||
2123 | module_init(efivars_init); | |
2124 | module_exit(efivars_exit); | |
2125 |