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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 | |
68 | #include <linux/capability.h> |
69 | #include <linux/types.h> |
70 | #include <linux/errno.h> |
71 | #include <linux/init.h> |
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> |
80 | #include <linux/slab.h> |
81 | #include <linux/pstore.h> |
82 | |
83 | #include <asm/uaccess.h> |
84 | |
85 | #define EFIVARS_VERSION "0.08" |
86 | #define EFIVARS_DATE "2004-May-17" |
87 | |
88 | MODULE_AUTHOR("Matt Domsch <Matt_Domsch@Dell.com>"); |
89 | MODULE_DESCRIPTION("sysfs interface to EFI Variables"); |
90 | MODULE_LICENSE("GPL"); |
91 | MODULE_VERSION(EFIVARS_VERSION); |
92 | |
93 | #define DUMP_NAME_LEN 52 |
94 | |
95 | /* |
96 | * The maximum size of VariableName + Data = 1024 |
97 | * Therefore, it's reasonable to save that much |
98 | * space in each part of the structure, |
99 | * and we use a page for reading/writing. |
100 | */ |
101 | |
102 | struct efi_variable { |
103 | efi_char16_t VariableName[1024/sizeof(efi_char16_t)]; |
104 | efi_guid_t VendorGuid; |
105 | unsigned long DataSize; |
106 | __u8 Data[1024]; |
107 | efi_status_t Status; |
108 | __u32 Attributes; |
109 | } __attribute__((packed)); |
110 | |
111 | |
112 | struct efivar_entry { |
113 | struct efivars *efivars; |
114 | struct efi_variable var; |
115 | struct list_head list; |
116 | struct kobject kobj; |
117 | }; |
118 | |
119 | struct efivar_attribute { |
120 | struct attribute attr; |
121 | ssize_t (*show) (struct efivar_entry *entry, char *buf); |
122 | ssize_t (*store)(struct efivar_entry *entry, const char *buf, size_t count); |
123 | }; |
124 | |
125 | #define PSTORE_EFI_ATTRIBUTES \ |
126 | (EFI_VARIABLE_NON_VOLATILE | \ |
127 | EFI_VARIABLE_BOOTSERVICE_ACCESS | \ |
128 | EFI_VARIABLE_RUNTIME_ACCESS) |
129 | |
130 | #define EFIVAR_ATTR(_name, _mode, _show, _store) \ |
131 | struct efivar_attribute efivar_attr_##_name = { \ |
132 | .attr = {.name = __stringify(_name), .mode = _mode}, \ |
133 | .show = _show, \ |
134 | .store = _store, \ |
135 | }; |
136 | |
137 | #define to_efivar_attr(_attr) container_of(_attr, struct efivar_attribute, attr) |
138 | #define to_efivar_entry(obj) container_of(obj, struct efivar_entry, kobj) |
139 | |
140 | /* |
141 | * Prototype for sysfs creation function |
142 | */ |
143 | static int |
144 | efivar_create_sysfs_entry(struct efivars *efivars, |
145 | unsigned long variable_name_size, |
146 | efi_char16_t *variable_name, |
147 | efi_guid_t *vendor_guid); |
148 | |
149 | /* Return the number of unicode characters in data */ |
150 | static unsigned long |
151 | utf16_strnlen(efi_char16_t *s, size_t maxlength) |
152 | { |
153 | unsigned long length = 0; |
154 | |
155 | while (*s++ != 0 && length < maxlength) |
156 | length++; |
157 | return length; |
158 | } |
159 | |
160 | static inline unsigned long |
161 | utf16_strlen(efi_char16_t *s) |
162 | { |
163 | return utf16_strnlen(s, ~0UL); |
164 | } |
165 | |
166 | /* |
167 | * Return the number of bytes is the length of this string |
168 | * Note: this is NOT the same as the number of unicode characters |
169 | */ |
170 | static inline unsigned long |
171 | utf16_strsize(efi_char16_t *data, unsigned long maxlength) |
172 | { |
173 | return utf16_strnlen(data, maxlength/sizeof(efi_char16_t)) * sizeof(efi_char16_t); |
174 | } |
175 | |
176 | static inline int |
177 | utf16_strncmp(const efi_char16_t *a, const efi_char16_t *b, size_t len) |
178 | { |
179 | while (1) { |
180 | if (len == 0) |
181 | return 0; |
182 | if (*a < *b) |
183 | return -1; |
184 | if (*a > *b) |
185 | return 1; |
186 | if (*a == 0) /* implies *b == 0 */ |
187 | return 0; |
188 | a++; |
189 | b++; |
190 | len--; |
191 | } |
192 | } |
193 | |
194 | static bool |
195 | validate_device_path(struct efi_variable *var, int match, u8 *buffer, |
196 | unsigned long len) |
197 | { |
198 | struct efi_generic_dev_path *node; |
199 | int offset = 0; |
200 | |
201 | node = (struct efi_generic_dev_path *)buffer; |
202 | |
203 | if (len < sizeof(*node)) |
204 | return false; |
205 | |
206 | while (offset <= len - sizeof(*node) && |
207 | node->length >= sizeof(*node) && |
208 | node->length <= len - offset) { |
209 | offset += node->length; |
210 | |
211 | if ((node->type == EFI_DEV_END_PATH || |
212 | node->type == EFI_DEV_END_PATH2) && |
213 | node->sub_type == EFI_DEV_END_ENTIRE) |
214 | return true; |
215 | |
216 | node = (struct efi_generic_dev_path *)(buffer + offset); |
217 | } |
218 | |
219 | /* |
220 | * If we're here then either node->length pointed past the end |
221 | * of the buffer or we reached the end of the buffer without |
222 | * finding a device path end node. |
223 | */ |
224 | return false; |
225 | } |
226 | |
227 | static bool |
228 | validate_boot_order(struct efi_variable *var, int match, u8 *buffer, |
229 | unsigned long len) |
230 | { |
231 | /* An array of 16-bit integers */ |
232 | if ((len % 2) != 0) |
233 | return false; |
234 | |
235 | return true; |
236 | } |
237 | |
238 | static bool |
239 | validate_load_option(struct efi_variable *var, int match, u8 *buffer, |
240 | unsigned long len) |
241 | { |
242 | u16 filepathlength; |
243 | int i, desclength = 0, namelen; |
244 | |
245 | namelen = utf16_strnlen(var->VariableName, sizeof(var->VariableName)); |
246 | |
247 | /* Either "Boot" or "Driver" followed by four digits of hex */ |
248 | for (i = match; i < match+4; i++) { |
249 | if (var->VariableName[i] > 127 || |
250 | hex_to_bin(var->VariableName[i] & 0xff) < 0) |
251 | return true; |
252 | } |
253 | |
254 | /* Reject it if there's 4 digits of hex and then further content */ |
255 | if (namelen > match + 4) |
256 | return false; |
257 | |
258 | /* A valid entry must be at least 8 bytes */ |
259 | if (len < 8) |
260 | return false; |
261 | |
262 | filepathlength = buffer[4] | buffer[5] << 8; |
263 | |
264 | /* |
265 | * There's no stored length for the description, so it has to be |
266 | * found by hand |
267 | */ |
268 | desclength = utf16_strsize((efi_char16_t *)(buffer + 6), len - 6) + 2; |
269 | |
270 | /* Each boot entry must have a descriptor */ |
271 | if (!desclength) |
272 | return false; |
273 | |
274 | /* |
275 | * If the sum of the length of the description, the claimed filepath |
276 | * length and the original header are greater than the length of the |
277 | * variable, it's malformed |
278 | */ |
279 | if ((desclength + filepathlength + 6) > len) |
280 | return false; |
281 | |
282 | /* |
283 | * And, finally, check the filepath |
284 | */ |
285 | return validate_device_path(var, match, buffer + desclength + 6, |
286 | filepathlength); |
287 | } |
288 | |
289 | static bool |
290 | validate_uint16(struct efi_variable *var, int match, u8 *buffer, |
291 | unsigned long len) |
292 | { |
293 | /* A single 16-bit integer */ |
294 | if (len != 2) |
295 | return false; |
296 | |
297 | return true; |
298 | } |
299 | |
300 | static bool |
301 | validate_ascii_string(struct efi_variable *var, int match, u8 *buffer, |
302 | unsigned long len) |
303 | { |
304 | int i; |
305 | |
306 | for (i = 0; i < len; i++) { |
307 | if (buffer[i] > 127) |
308 | return false; |
309 | |
310 | if (buffer[i] == 0) |
311 | return true; |
312 | } |
313 | |
314 | return false; |
315 | } |
316 | |
317 | struct variable_validate { |
318 | char *name; |
319 | bool (*validate)(struct efi_variable *var, int match, u8 *data, |
320 | unsigned long len); |
321 | }; |
322 | |
323 | static const struct variable_validate variable_validate[] = { |
324 | { "BootNext", validate_uint16 }, |
325 | { "BootOrder", validate_boot_order }, |
326 | { "DriverOrder", validate_boot_order }, |
327 | { "Boot*", validate_load_option }, |
328 | { "Driver*", validate_load_option }, |
329 | { "ConIn", validate_device_path }, |
330 | { "ConInDev", validate_device_path }, |
331 | { "ConOut", validate_device_path }, |
332 | { "ConOutDev", validate_device_path }, |
333 | { "ErrOut", validate_device_path }, |
334 | { "ErrOutDev", validate_device_path }, |
335 | { "Timeout", validate_uint16 }, |
336 | { "Lang", validate_ascii_string }, |
337 | { "PlatformLang", validate_ascii_string }, |
338 | { "", NULL }, |
339 | }; |
340 | |
341 | static bool |
342 | validate_var(struct efi_variable *var, u8 *data, unsigned long len) |
343 | { |
344 | int i; |
345 | u16 *unicode_name = var->VariableName; |
346 | |
347 | for (i = 0; variable_validate[i].validate != NULL; i++) { |
348 | const char *name = variable_validate[i].name; |
349 | int match; |
350 | |
351 | for (match = 0; ; match++) { |
352 | char c = name[match]; |
353 | u16 u = unicode_name[match]; |
354 | |
355 | /* All special variables are plain ascii */ |
356 | if (u > 127) |
357 | return true; |
358 | |
359 | /* Wildcard in the matching name means we've matched */ |
360 | if (c == '*') |
361 | return variable_validate[i].validate(var, |
362 | match, data, len); |
363 | |
364 | /* Case sensitive match */ |
365 | if (c != u) |
366 | break; |
367 | |
368 | /* Reached the end of the string while matching */ |
369 | if (!c) |
370 | return variable_validate[i].validate(var, |
371 | match, data, len); |
372 | } |
373 | } |
374 | |
375 | return true; |
376 | } |
377 | |
378 | static efi_status_t |
379 | get_var_data_locked(struct efivars *efivars, struct efi_variable *var) |
380 | { |
381 | efi_status_t status; |
382 | |
383 | var->DataSize = 1024; |
384 | status = efivars->ops->get_variable(var->VariableName, |
385 | &var->VendorGuid, |
386 | &var->Attributes, |
387 | &var->DataSize, |
388 | var->Data); |
389 | return status; |
390 | } |
391 | |
392 | static efi_status_t |
393 | get_var_data(struct efivars *efivars, struct efi_variable *var) |
394 | { |
395 | efi_status_t status; |
396 | |
397 | spin_lock(&efivars->lock); |
398 | status = get_var_data_locked(efivars, var); |
399 | spin_unlock(&efivars->lock); |
400 | |
401 | if (status != EFI_SUCCESS) { |
402 | printk(KERN_WARNING "efivars: get_variable() failed 0x%lx!\n", |
403 | status); |
404 | } |
405 | return status; |
406 | } |
407 | |
408 | static ssize_t |
409 | efivar_guid_read(struct efivar_entry *entry, char *buf) |
410 | { |
411 | struct efi_variable *var = &entry->var; |
412 | char *str = buf; |
413 | |
414 | if (!entry || !buf) |
415 | return 0; |
416 | |
417 | efi_guid_unparse(&var->VendorGuid, str); |
418 | str += strlen(str); |
419 | str += sprintf(str, "\n"); |
420 | |
421 | return str - buf; |
422 | } |
423 | |
424 | static ssize_t |
425 | efivar_attr_read(struct efivar_entry *entry, char *buf) |
426 | { |
427 | struct efi_variable *var = &entry->var; |
428 | char *str = buf; |
429 | efi_status_t status; |
430 | |
431 | if (!entry || !buf) |
432 | return -EINVAL; |
433 | |
434 | status = get_var_data(entry->efivars, var); |
435 | if (status != EFI_SUCCESS) |
436 | return -EIO; |
437 | |
438 | if (var->Attributes & 0x1) |
439 | str += sprintf(str, "EFI_VARIABLE_NON_VOLATILE\n"); |
440 | if (var->Attributes & 0x2) |
441 | str += sprintf(str, "EFI_VARIABLE_BOOTSERVICE_ACCESS\n"); |
442 | if (var->Attributes & 0x4) |
443 | str += sprintf(str, "EFI_VARIABLE_RUNTIME_ACCESS\n"); |
444 | return str - buf; |
445 | } |
446 | |
447 | static ssize_t |
448 | efivar_size_read(struct efivar_entry *entry, char *buf) |
449 | { |
450 | struct efi_variable *var = &entry->var; |
451 | char *str = buf; |
452 | efi_status_t status; |
453 | |
454 | if (!entry || !buf) |
455 | return -EINVAL; |
456 | |
457 | status = get_var_data(entry->efivars, var); |
458 | if (status != EFI_SUCCESS) |
459 | return -EIO; |
460 | |
461 | str += sprintf(str, "0x%lx\n", var->DataSize); |
462 | return str - buf; |
463 | } |
464 | |
465 | static ssize_t |
466 | efivar_data_read(struct efivar_entry *entry, char *buf) |
467 | { |
468 | struct efi_variable *var = &entry->var; |
469 | efi_status_t status; |
470 | |
471 | if (!entry || !buf) |
472 | return -EINVAL; |
473 | |
474 | status = get_var_data(entry->efivars, var); |
475 | if (status != EFI_SUCCESS) |
476 | return -EIO; |
477 | |
478 | memcpy(buf, var->Data, var->DataSize); |
479 | return var->DataSize; |
480 | } |
481 | /* |
482 | * We allow each variable to be edited via rewriting the |
483 | * entire efi variable structure. |
484 | */ |
485 | static ssize_t |
486 | efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count) |
487 | { |
488 | struct efi_variable *new_var, *var = &entry->var; |
489 | struct efivars *efivars = entry->efivars; |
490 | efi_status_t status = EFI_NOT_FOUND; |
491 | |
492 | if (count != sizeof(struct efi_variable)) |
493 | return -EINVAL; |
494 | |
495 | new_var = (struct efi_variable *)buf; |
496 | /* |
497 | * If only updating the variable data, then the name |
498 | * and guid should remain the same |
499 | */ |
500 | if (memcmp(new_var->VariableName, var->VariableName, sizeof(var->VariableName)) || |
501 | efi_guidcmp(new_var->VendorGuid, var->VendorGuid)) { |
502 | printk(KERN_ERR "efivars: Cannot edit the wrong variable!\n"); |
503 | return -EINVAL; |
504 | } |
505 | |
506 | if ((new_var->DataSize <= 0) || (new_var->Attributes == 0)){ |
507 | printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n"); |
508 | return -EINVAL; |
509 | } |
510 | |
511 | if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 || |
512 | validate_var(new_var, new_var->Data, new_var->DataSize) == false) { |
513 | printk(KERN_ERR "efivars: Malformed variable content\n"); |
514 | return -EINVAL; |
515 | } |
516 | |
517 | spin_lock(&efivars->lock); |
518 | status = efivars->ops->set_variable(new_var->VariableName, |
519 | &new_var->VendorGuid, |
520 | new_var->Attributes, |
521 | new_var->DataSize, |
522 | new_var->Data); |
523 | |
524 | spin_unlock(&efivars->lock); |
525 | |
526 | if (status != EFI_SUCCESS) { |
527 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", |
528 | status); |
529 | return -EIO; |
530 | } |
531 | |
532 | memcpy(&entry->var, new_var, count); |
533 | return count; |
534 | } |
535 | |
536 | static ssize_t |
537 | efivar_show_raw(struct efivar_entry *entry, char *buf) |
538 | { |
539 | struct efi_variable *var = &entry->var; |
540 | efi_status_t status; |
541 | |
542 | if (!entry || !buf) |
543 | return 0; |
544 | |
545 | status = get_var_data(entry->efivars, var); |
546 | if (status != EFI_SUCCESS) |
547 | return -EIO; |
548 | |
549 | memcpy(buf, var, sizeof(*var)); |
550 | return sizeof(*var); |
551 | } |
552 | |
553 | /* |
554 | * Generic read/write functions that call the specific functions of |
555 | * the attributes... |
556 | */ |
557 | static ssize_t efivar_attr_show(struct kobject *kobj, struct attribute *attr, |
558 | char *buf) |
559 | { |
560 | struct efivar_entry *var = to_efivar_entry(kobj); |
561 | struct efivar_attribute *efivar_attr = to_efivar_attr(attr); |
562 | ssize_t ret = -EIO; |
563 | |
564 | if (!capable(CAP_SYS_ADMIN)) |
565 | return -EACCES; |
566 | |
567 | if (efivar_attr->show) { |
568 | ret = efivar_attr->show(var, buf); |
569 | } |
570 | return ret; |
571 | } |
572 | |
573 | static ssize_t efivar_attr_store(struct kobject *kobj, struct attribute *attr, |
574 | const char *buf, size_t count) |
575 | { |
576 | struct efivar_entry *var = to_efivar_entry(kobj); |
577 | struct efivar_attribute *efivar_attr = to_efivar_attr(attr); |
578 | ssize_t ret = -EIO; |
579 | |
580 | if (!capable(CAP_SYS_ADMIN)) |
581 | return -EACCES; |
582 | |
583 | if (efivar_attr->store) |
584 | ret = efivar_attr->store(var, buf, count); |
585 | |
586 | return ret; |
587 | } |
588 | |
589 | static const struct sysfs_ops efivar_attr_ops = { |
590 | .show = efivar_attr_show, |
591 | .store = efivar_attr_store, |
592 | }; |
593 | |
594 | static void efivar_release(struct kobject *kobj) |
595 | { |
596 | struct efivar_entry *var = container_of(kobj, struct efivar_entry, kobj); |
597 | kfree(var); |
598 | } |
599 | |
600 | static EFIVAR_ATTR(guid, 0400, efivar_guid_read, NULL); |
601 | static EFIVAR_ATTR(attributes, 0400, efivar_attr_read, NULL); |
602 | static EFIVAR_ATTR(size, 0400, efivar_size_read, NULL); |
603 | static EFIVAR_ATTR(data, 0400, efivar_data_read, NULL); |
604 | static EFIVAR_ATTR(raw_var, 0600, efivar_show_raw, efivar_store_raw); |
605 | |
606 | static struct attribute *def_attrs[] = { |
607 | &efivar_attr_guid.attr, |
608 | &efivar_attr_size.attr, |
609 | &efivar_attr_attributes.attr, |
610 | &efivar_attr_data.attr, |
611 | &efivar_attr_raw_var.attr, |
612 | NULL, |
613 | }; |
614 | |
615 | static struct kobj_type efivar_ktype = { |
616 | .release = efivar_release, |
617 | .sysfs_ops = &efivar_attr_ops, |
618 | .default_attrs = def_attrs, |
619 | }; |
620 | |
621 | static struct pstore_info efi_pstore_info; |
622 | |
623 | static inline void |
624 | efivar_unregister(struct efivar_entry *var) |
625 | { |
626 | kobject_put(&var->kobj); |
627 | } |
628 | |
629 | #ifdef CONFIG_PSTORE |
630 | |
631 | static int efi_pstore_open(struct pstore_info *psi) |
632 | { |
633 | struct efivars *efivars = psi->data; |
634 | |
635 | spin_lock(&efivars->lock); |
636 | efivars->walk_entry = list_first_entry(&efivars->list, |
637 | struct efivar_entry, list); |
638 | return 0; |
639 | } |
640 | |
641 | static int efi_pstore_close(struct pstore_info *psi) |
642 | { |
643 | struct efivars *efivars = psi->data; |
644 | |
645 | spin_unlock(&efivars->lock); |
646 | return 0; |
647 | } |
648 | |
649 | static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, |
650 | struct timespec *timespec, |
651 | char **buf, struct pstore_info *psi) |
652 | { |
653 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; |
654 | struct efivars *efivars = psi->data; |
655 | char name[DUMP_NAME_LEN]; |
656 | int i; |
657 | unsigned int part, size; |
658 | unsigned long time; |
659 | |
660 | while (&efivars->walk_entry->list != &efivars->list) { |
661 | if (!efi_guidcmp(efivars->walk_entry->var.VendorGuid, |
662 | vendor)) { |
663 | for (i = 0; i < DUMP_NAME_LEN; i++) { |
664 | name[i] = efivars->walk_entry->var.VariableName[i]; |
665 | } |
666 | if (sscanf(name, "dump-type%u-%u-%lu", type, &part, &time) == 3) { |
667 | *id = part; |
668 | timespec->tv_sec = time; |
669 | timespec->tv_nsec = 0; |
670 | get_var_data_locked(efivars, &efivars->walk_entry->var); |
671 | size = efivars->walk_entry->var.DataSize; |
672 | *buf = kmalloc(size, GFP_KERNEL); |
673 | if (*buf == NULL) |
674 | return -ENOMEM; |
675 | memcpy(*buf, efivars->walk_entry->var.Data, |
676 | size); |
677 | efivars->walk_entry = list_entry(efivars->walk_entry->list.next, |
678 | struct efivar_entry, list); |
679 | return size; |
680 | } |
681 | } |
682 | efivars->walk_entry = list_entry(efivars->walk_entry->list.next, |
683 | struct efivar_entry, list); |
684 | } |
685 | return 0; |
686 | } |
687 | |
688 | static int efi_pstore_write(enum pstore_type_id type, |
689 | enum kmsg_dump_reason reason, u64 *id, |
690 | unsigned int part, size_t size, struct pstore_info *psi) |
691 | { |
692 | char name[DUMP_NAME_LEN]; |
693 | char stub_name[DUMP_NAME_LEN]; |
694 | efi_char16_t efi_name[DUMP_NAME_LEN]; |
695 | efi_guid_t vendor = LINUX_EFI_CRASH_GUID; |
696 | struct efivars *efivars = psi->data; |
697 | struct efivar_entry *entry, *found = NULL; |
698 | int i, ret = 0; |
699 | |
700 | sprintf(stub_name, "dump-type%u-%u-", type, part); |
701 | sprintf(name, "%s%lu", stub_name, get_seconds()); |
702 | |
703 | spin_lock(&efivars->lock); |
704 | |
705 | for (i = 0; i < DUMP_NAME_LEN; i++) |
706 | efi_name[i] = stub_name[i]; |
707 | |
708 | /* |
709 | * Clean up any entries with the same name |
710 | */ |
711 | |
712 | list_for_each_entry(entry, &efivars->list, list) { |
713 | get_var_data_locked(efivars, &entry->var); |
714 | |
715 | if (efi_guidcmp(entry->var.VendorGuid, vendor)) |
716 | continue; |
717 | if (utf16_strncmp(entry->var.VariableName, efi_name, |
718 | utf16_strlen(efi_name))) |
719 | continue; |
720 | /* Needs to be a prefix */ |
721 | if (entry->var.VariableName[utf16_strlen(efi_name)] == 0) |
722 | continue; |
723 | |
724 | /* found */ |
725 | found = entry; |
726 | efivars->ops->set_variable(entry->var.VariableName, |
727 | &entry->var.VendorGuid, |
728 | PSTORE_EFI_ATTRIBUTES, |
729 | 0, NULL); |
730 | } |
731 | |
732 | if (found) |
733 | list_del(&found->list); |
734 | |
735 | for (i = 0; i < DUMP_NAME_LEN; i++) |
736 | efi_name[i] = name[i]; |
737 | |
738 | efivars->ops->set_variable(efi_name, &vendor, PSTORE_EFI_ATTRIBUTES, |
739 | size, psi->buf); |
740 | |
741 | spin_unlock(&efivars->lock); |
742 | |
743 | if (found) |
744 | efivar_unregister(found); |
745 | |
746 | if (size) |
747 | ret = efivar_create_sysfs_entry(efivars, |
748 | utf16_strsize(efi_name, |
749 | DUMP_NAME_LEN * 2), |
750 | efi_name, &vendor); |
751 | |
752 | *id = part; |
753 | return ret; |
754 | }; |
755 | |
756 | static int efi_pstore_erase(enum pstore_type_id type, u64 id, |
757 | struct pstore_info *psi) |
758 | { |
759 | efi_pstore_write(type, 0, &id, (unsigned int)id, 0, psi); |
760 | |
761 | return 0; |
762 | } |
763 | #else |
764 | static int efi_pstore_open(struct pstore_info *psi) |
765 | { |
766 | return 0; |
767 | } |
768 | |
769 | static int efi_pstore_close(struct pstore_info *psi) |
770 | { |
771 | return 0; |
772 | } |
773 | |
774 | static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, |
775 | struct timespec *timespec, |
776 | char **buf, struct pstore_info *psi) |
777 | { |
778 | return -1; |
779 | } |
780 | |
781 | static int efi_pstore_write(enum pstore_type_id type, |
782 | enum kmsg_dump_reason reason, u64 *id, |
783 | unsigned int part, size_t size, struct pstore_info *psi) |
784 | { |
785 | return 0; |
786 | } |
787 | |
788 | static int efi_pstore_erase(enum pstore_type_id type, u64 id, |
789 | struct pstore_info *psi) |
790 | { |
791 | return 0; |
792 | } |
793 | #endif |
794 | |
795 | static struct pstore_info efi_pstore_info = { |
796 | .owner = THIS_MODULE, |
797 | .name = "efi", |
798 | .open = efi_pstore_open, |
799 | .close = efi_pstore_close, |
800 | .read = efi_pstore_read, |
801 | .write = efi_pstore_write, |
802 | .erase = efi_pstore_erase, |
803 | }; |
804 | |
805 | static ssize_t efivar_create(struct file *filp, struct kobject *kobj, |
806 | struct bin_attribute *bin_attr, |
807 | char *buf, loff_t pos, size_t count) |
808 | { |
809 | struct efi_variable *new_var = (struct efi_variable *)buf; |
810 | struct efivars *efivars = bin_attr->private; |
811 | struct efivar_entry *search_efivar, *n; |
812 | unsigned long strsize1, strsize2; |
813 | efi_status_t status = EFI_NOT_FOUND; |
814 | int found = 0; |
815 | |
816 | if (!capable(CAP_SYS_ADMIN)) |
817 | return -EACCES; |
818 | |
819 | if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 || |
820 | validate_var(new_var, new_var->Data, new_var->DataSize) == false) { |
821 | printk(KERN_ERR "efivars: Malformed variable content\n"); |
822 | return -EINVAL; |
823 | } |
824 | |
825 | spin_lock(&efivars->lock); |
826 | |
827 | /* |
828 | * Does this variable already exist? |
829 | */ |
830 | list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
831 | strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); |
832 | strsize2 = utf16_strsize(new_var->VariableName, 1024); |
833 | if (strsize1 == strsize2 && |
834 | !memcmp(&(search_efivar->var.VariableName), |
835 | new_var->VariableName, strsize1) && |
836 | !efi_guidcmp(search_efivar->var.VendorGuid, |
837 | new_var->VendorGuid)) { |
838 | found = 1; |
839 | break; |
840 | } |
841 | } |
842 | if (found) { |
843 | spin_unlock(&efivars->lock); |
844 | return -EINVAL; |
845 | } |
846 | |
847 | /* now *really* create the variable via EFI */ |
848 | status = efivars->ops->set_variable(new_var->VariableName, |
849 | &new_var->VendorGuid, |
850 | new_var->Attributes, |
851 | new_var->DataSize, |
852 | new_var->Data); |
853 | |
854 | if (status != EFI_SUCCESS) { |
855 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", |
856 | status); |
857 | spin_unlock(&efivars->lock); |
858 | return -EIO; |
859 | } |
860 | spin_unlock(&efivars->lock); |
861 | |
862 | /* Create the entry in sysfs. Locking is not required here */ |
863 | status = efivar_create_sysfs_entry(efivars, |
864 | utf16_strsize(new_var->VariableName, |
865 | 1024), |
866 | new_var->VariableName, |
867 | &new_var->VendorGuid); |
868 | if (status) { |
869 | printk(KERN_WARNING "efivars: variable created, but sysfs entry wasn't.\n"); |
870 | } |
871 | return count; |
872 | } |
873 | |
874 | static ssize_t efivar_delete(struct file *filp, struct kobject *kobj, |
875 | struct bin_attribute *bin_attr, |
876 | char *buf, loff_t pos, size_t count) |
877 | { |
878 | struct efi_variable *del_var = (struct efi_variable *)buf; |
879 | struct efivars *efivars = bin_attr->private; |
880 | struct efivar_entry *search_efivar, *n; |
881 | unsigned long strsize1, strsize2; |
882 | efi_status_t status = EFI_NOT_FOUND; |
883 | int found = 0; |
884 | |
885 | if (!capable(CAP_SYS_ADMIN)) |
886 | return -EACCES; |
887 | |
888 | spin_lock(&efivars->lock); |
889 | |
890 | /* |
891 | * Does this variable already exist? |
892 | */ |
893 | list_for_each_entry_safe(search_efivar, n, &efivars->list, list) { |
894 | strsize1 = utf16_strsize(search_efivar->var.VariableName, 1024); |
895 | strsize2 = utf16_strsize(del_var->VariableName, 1024); |
896 | if (strsize1 == strsize2 && |
897 | !memcmp(&(search_efivar->var.VariableName), |
898 | del_var->VariableName, strsize1) && |
899 | !efi_guidcmp(search_efivar->var.VendorGuid, |
900 | del_var->VendorGuid)) { |
901 | found = 1; |
902 | break; |
903 | } |
904 | } |
905 | if (!found) { |
906 | spin_unlock(&efivars->lock); |
907 | return -EINVAL; |
908 | } |
909 | /* force the Attributes/DataSize to 0 to ensure deletion */ |
910 | del_var->Attributes = 0; |
911 | del_var->DataSize = 0; |
912 | |
913 | status = efivars->ops->set_variable(del_var->VariableName, |
914 | &del_var->VendorGuid, |
915 | del_var->Attributes, |
916 | del_var->DataSize, |
917 | del_var->Data); |
918 | |
919 | if (status != EFI_SUCCESS) { |
920 | printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n", |
921 | status); |
922 | spin_unlock(&efivars->lock); |
923 | return -EIO; |
924 | } |
925 | list_del(&search_efivar->list); |
926 | /* We need to release this lock before unregistering. */ |
927 | spin_unlock(&efivars->lock); |
928 | efivar_unregister(search_efivar); |
929 | |
930 | /* It's dead Jim.... */ |
931 | return count; |
932 | } |
933 | |
934 | /* |
935 | * Let's not leave out systab information that snuck into |
936 | * the efivars driver |
937 | */ |
938 | static ssize_t systab_show(struct kobject *kobj, |
939 | struct kobj_attribute *attr, char *buf) |
940 | { |
941 | char *str = buf; |
942 | |
943 | if (!kobj || !buf) |
944 | return -EINVAL; |
945 | |
946 | if (efi.mps != EFI_INVALID_TABLE_ADDR) |
947 | str += sprintf(str, "MPS=0x%lx\n", efi.mps); |
948 | if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) |
949 | str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20); |
950 | if (efi.acpi != EFI_INVALID_TABLE_ADDR) |
951 | str += sprintf(str, "ACPI=0x%lx\n", efi.acpi); |
952 | if (efi.smbios != EFI_INVALID_TABLE_ADDR) |
953 | str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios); |
954 | if (efi.hcdp != EFI_INVALID_TABLE_ADDR) |
955 | str += sprintf(str, "HCDP=0x%lx\n", efi.hcdp); |
956 | if (efi.boot_info != EFI_INVALID_TABLE_ADDR) |
957 | str += sprintf(str, "BOOTINFO=0x%lx\n", efi.boot_info); |
958 | if (efi.uga != EFI_INVALID_TABLE_ADDR) |
959 | str += sprintf(str, "UGA=0x%lx\n", efi.uga); |
960 | |
961 | return str - buf; |
962 | } |
963 | |
964 | static struct kobj_attribute efi_attr_systab = |
965 | __ATTR(systab, 0400, systab_show, NULL); |
966 | |
967 | static struct attribute *efi_subsys_attrs[] = { |
968 | &efi_attr_systab.attr, |
969 | NULL, /* maybe more in the future? */ |
970 | }; |
971 | |
972 | static struct attribute_group efi_subsys_attr_group = { |
973 | .attrs = efi_subsys_attrs, |
974 | }; |
975 | |
976 | static struct kobject *efi_kobj; |
977 | |
978 | /* |
979 | * efivar_create_sysfs_entry() |
980 | * Requires: |
981 | * variable_name_size = number of bytes required to hold |
982 | * variable_name (not counting the NULL |
983 | * character at the end. |
984 | * efivars->lock is not held on entry or exit. |
985 | * Returns 1 on failure, 0 on success |
986 | */ |
987 | static int |
988 | efivar_create_sysfs_entry(struct efivars *efivars, |
989 | unsigned long variable_name_size, |
990 | efi_char16_t *variable_name, |
991 | efi_guid_t *vendor_guid) |
992 | { |
993 | int i, short_name_size = variable_name_size / sizeof(efi_char16_t) + 38; |
994 | char *short_name; |
995 | struct efivar_entry *new_efivar; |
996 | |
997 | short_name = kzalloc(short_name_size + 1, GFP_KERNEL); |
998 | new_efivar = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL); |
999 | |
1000 | if (!short_name || !new_efivar) { |
1001 | kfree(short_name); |
1002 | kfree(new_efivar); |
1003 | return 1; |
1004 | } |
1005 | |
1006 | new_efivar->efivars = efivars; |
1007 | memcpy(new_efivar->var.VariableName, variable_name, |
1008 | variable_name_size); |
1009 | memcpy(&(new_efivar->var.VendorGuid), vendor_guid, sizeof(efi_guid_t)); |
1010 | |
1011 | /* Convert Unicode to normal chars (assume top bits are 0), |
1012 | ala UTF-8 */ |
1013 | for (i=0; i < (int)(variable_name_size / sizeof(efi_char16_t)); i++) { |
1014 | short_name[i] = variable_name[i] & 0xFF; |
1015 | } |
1016 | /* This is ugly, but necessary to separate one vendor's |
1017 | private variables from another's. */ |
1018 | |
1019 | *(short_name + strlen(short_name)) = '-'; |
1020 | efi_guid_unparse(vendor_guid, short_name + strlen(short_name)); |
1021 | |
1022 | new_efivar->kobj.kset = efivars->kset; |
1023 | i = kobject_init_and_add(&new_efivar->kobj, &efivar_ktype, NULL, |
1024 | "%s", short_name); |
1025 | if (i) { |
1026 | kfree(short_name); |
1027 | kfree(new_efivar); |
1028 | return 1; |
1029 | } |
1030 | |
1031 | kobject_uevent(&new_efivar->kobj, KOBJ_ADD); |
1032 | kfree(short_name); |
1033 | short_name = NULL; |
1034 | |
1035 | spin_lock(&efivars->lock); |
1036 | list_add(&new_efivar->list, &efivars->list); |
1037 | spin_unlock(&efivars->lock); |
1038 | |
1039 | return 0; |
1040 | } |
1041 | |
1042 | static int |
1043 | create_efivars_bin_attributes(struct efivars *efivars) |
1044 | { |
1045 | struct bin_attribute *attr; |
1046 | int error; |
1047 | |
1048 | /* new_var */ |
1049 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); |
1050 | if (!attr) |
1051 | return -ENOMEM; |
1052 | |
1053 | attr->attr.name = "new_var"; |
1054 | attr->attr.mode = 0200; |
1055 | attr->write = efivar_create; |
1056 | attr->private = efivars; |
1057 | efivars->new_var = attr; |
1058 | |
1059 | /* del_var */ |
1060 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); |
1061 | if (!attr) { |
1062 | error = -ENOMEM; |
1063 | goto out_free; |
1064 | } |
1065 | attr->attr.name = "del_var"; |
1066 | attr->attr.mode = 0200; |
1067 | attr->write = efivar_delete; |
1068 | attr->private = efivars; |
1069 | efivars->del_var = attr; |
1070 | |
1071 | sysfs_bin_attr_init(efivars->new_var); |
1072 | sysfs_bin_attr_init(efivars->del_var); |
1073 | |
1074 | /* Register */ |
1075 | error = sysfs_create_bin_file(&efivars->kset->kobj, |
1076 | efivars->new_var); |
1077 | if (error) { |
1078 | printk(KERN_ERR "efivars: unable to create new_var sysfs file" |
1079 | " due to error %d\n", error); |
1080 | goto out_free; |
1081 | } |
1082 | error = sysfs_create_bin_file(&efivars->kset->kobj, |
1083 | efivars->del_var); |
1084 | if (error) { |
1085 | printk(KERN_ERR "efivars: unable to create del_var sysfs file" |
1086 | " due to error %d\n", error); |
1087 | sysfs_remove_bin_file(&efivars->kset->kobj, |
1088 | efivars->new_var); |
1089 | goto out_free; |
1090 | } |
1091 | |
1092 | return 0; |
1093 | out_free: |
1094 | kfree(efivars->del_var); |
1095 | efivars->del_var = NULL; |
1096 | kfree(efivars->new_var); |
1097 | efivars->new_var = NULL; |
1098 | return error; |
1099 | } |
1100 | |
1101 | void unregister_efivars(struct efivars *efivars) |
1102 | { |
1103 | struct efivar_entry *entry, *n; |
1104 | |
1105 | list_for_each_entry_safe(entry, n, &efivars->list, list) { |
1106 | spin_lock(&efivars->lock); |
1107 | list_del(&entry->list); |
1108 | spin_unlock(&efivars->lock); |
1109 | efivar_unregister(entry); |
1110 | } |
1111 | if (efivars->new_var) |
1112 | sysfs_remove_bin_file(&efivars->kset->kobj, efivars->new_var); |
1113 | if (efivars->del_var) |
1114 | sysfs_remove_bin_file(&efivars->kset->kobj, efivars->del_var); |
1115 | kfree(efivars->new_var); |
1116 | kfree(efivars->del_var); |
1117 | kset_unregister(efivars->kset); |
1118 | } |
1119 | EXPORT_SYMBOL_GPL(unregister_efivars); |
1120 | |
1121 | int register_efivars(struct efivars *efivars, |
1122 | const struct efivar_operations *ops, |
1123 | struct kobject *parent_kobj) |
1124 | { |
1125 | efi_status_t status = EFI_NOT_FOUND; |
1126 | efi_guid_t vendor_guid; |
1127 | efi_char16_t *variable_name; |
1128 | unsigned long variable_name_size = 1024; |
1129 | int error = 0; |
1130 | |
1131 | variable_name = kzalloc(variable_name_size, GFP_KERNEL); |
1132 | if (!variable_name) { |
1133 | printk(KERN_ERR "efivars: Memory allocation failed.\n"); |
1134 | return -ENOMEM; |
1135 | } |
1136 | |
1137 | spin_lock_init(&efivars->lock); |
1138 | INIT_LIST_HEAD(&efivars->list); |
1139 | efivars->ops = ops; |
1140 | |
1141 | efivars->kset = kset_create_and_add("vars", NULL, parent_kobj); |
1142 | if (!efivars->kset) { |
1143 | printk(KERN_ERR "efivars: Subsystem registration failed.\n"); |
1144 | error = -ENOMEM; |
1145 | goto out; |
1146 | } |
1147 | |
1148 | /* |
1149 | * Per EFI spec, the maximum storage allocated for both |
1150 | * the variable name and variable data is 1024 bytes. |
1151 | */ |
1152 | |
1153 | do { |
1154 | variable_name_size = 1024; |
1155 | |
1156 | status = ops->get_next_variable(&variable_name_size, |
1157 | variable_name, |
1158 | &vendor_guid); |
1159 | switch (status) { |
1160 | case EFI_SUCCESS: |
1161 | efivar_create_sysfs_entry(efivars, |
1162 | variable_name_size, |
1163 | variable_name, |
1164 | &vendor_guid); |
1165 | break; |
1166 | case EFI_NOT_FOUND: |
1167 | break; |
1168 | default: |
1169 | printk(KERN_WARNING "efivars: get_next_variable: status=%lx\n", |
1170 | status); |
1171 | status = EFI_NOT_FOUND; |
1172 | break; |
1173 | } |
1174 | } while (status != EFI_NOT_FOUND); |
1175 | |
1176 | error = create_efivars_bin_attributes(efivars); |
1177 | if (error) |
1178 | unregister_efivars(efivars); |
1179 | |
1180 | efivars->efi_pstore_info = efi_pstore_info; |
1181 | |
1182 | efivars->efi_pstore_info.buf = kmalloc(4096, GFP_KERNEL); |
1183 | if (efivars->efi_pstore_info.buf) { |
1184 | efivars->efi_pstore_info.bufsize = 1024; |
1185 | efivars->efi_pstore_info.data = efivars; |
1186 | spin_lock_init(&efivars->efi_pstore_info.buf_lock); |
1187 | pstore_register(&efivars->efi_pstore_info); |
1188 | } |
1189 | |
1190 | out: |
1191 | kfree(variable_name); |
1192 | |
1193 | return error; |
1194 | } |
1195 | EXPORT_SYMBOL_GPL(register_efivars); |
1196 | |
1197 | static struct efivars __efivars; |
1198 | static struct efivar_operations ops; |
1199 | |
1200 | /* |
1201 | * For now we register the efi subsystem with the firmware subsystem |
1202 | * and the vars subsystem with the efi subsystem. In the future, it |
1203 | * might make sense to split off the efi subsystem into its own |
1204 | * driver, but for now only efivars will register with it, so just |
1205 | * include it here. |
1206 | */ |
1207 | |
1208 | static int __init |
1209 | efivars_init(void) |
1210 | { |
1211 | int error = 0; |
1212 | |
1213 | printk(KERN_INFO "EFI Variables Facility v%s %s\n", EFIVARS_VERSION, |
1214 | EFIVARS_DATE); |
1215 | |
1216 | if (!efi_enabled) |
1217 | return 0; |
1218 | |
1219 | /* For now we'll register the efi directory at /sys/firmware/efi */ |
1220 | efi_kobj = kobject_create_and_add("efi", firmware_kobj); |
1221 | if (!efi_kobj) { |
1222 | printk(KERN_ERR "efivars: Firmware registration failed.\n"); |
1223 | return -ENOMEM; |
1224 | } |
1225 | |
1226 | ops.get_variable = efi.get_variable; |
1227 | ops.set_variable = efi.set_variable; |
1228 | ops.get_next_variable = efi.get_next_variable; |
1229 | error = register_efivars(&__efivars, &ops, efi_kobj); |
1230 | if (error) |
1231 | goto err_put; |
1232 | |
1233 | /* Don't forget the systab entry */ |
1234 | error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group); |
1235 | if (error) { |
1236 | printk(KERN_ERR |
1237 | "efivars: Sysfs attribute export failed with error %d.\n", |
1238 | error); |
1239 | goto err_unregister; |
1240 | } |
1241 | |
1242 | return 0; |
1243 | |
1244 | err_unregister: |
1245 | unregister_efivars(&__efivars); |
1246 | err_put: |
1247 | kobject_put(efi_kobj); |
1248 | return error; |
1249 | } |
1250 | |
1251 | static void __exit |
1252 | efivars_exit(void) |
1253 | { |
1254 | if (efi_enabled) { |
1255 | unregister_efivars(&__efivars); |
1256 | kobject_put(efi_kobj); |
1257 | } |
1258 | } |
1259 | |
1260 | module_init(efivars_init); |
1261 | module_exit(efivars_exit); |
1262 | |
1263 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
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jz47xx
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master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9