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