1 |
/* |
2 |
* fs/tomoyo_domain.c |
3 |
* |
4 |
* Implementation of the Domain-Based Mandatory Access Control. |
5 |
* |
6 |
* Copyright (C) 2005-2008 NTT DATA CORPORATION |
7 |
* |
8 |
* Version: 1.6.5-pre 2008/10/11 |
9 |
* |
10 |
* This file is applicable to both 2.4.30 and 2.6.11 and later. |
11 |
* See README.ccs for ChangeLog. |
12 |
* |
13 |
*/ |
14 |
|
15 |
#include <linux/ccs_common.h> |
16 |
#include <linux/tomoyo.h> |
17 |
#include <linux/realpath.h> |
18 |
#include <linux/highmem.h> |
19 |
#include <linux/binfmts.h> |
20 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
21 |
#include <linux/namei.h> |
22 |
#include <linux/mount.h> |
23 |
#endif |
24 |
|
25 |
/* For compatibility with older kernels. */ |
26 |
#ifndef for_each_process |
27 |
#define for_each_process for_each_task |
28 |
#endif |
29 |
|
30 |
/* Variables definitions.*/ |
31 |
|
32 |
/* The initial domain. */ |
33 |
struct domain_info KERNEL_DOMAIN; |
34 |
|
35 |
/* The list for "struct domain_info". */ |
36 |
LIST1_HEAD(domain_list); |
37 |
|
38 |
#ifdef CONFIG_TOMOYO |
39 |
|
40 |
/* Domain creation lock. */ |
41 |
static DEFINE_MUTEX(new_domain_assign_lock); |
42 |
|
43 |
/* Structure for "initialize_domain" and "no_initialize_domain" keyword. */ |
44 |
struct domain_initializer_entry { |
45 |
struct list1_head list; |
46 |
const struct path_info *domainname; /* This may be NULL */ |
47 |
const struct path_info *program; |
48 |
bool is_deleted; |
49 |
bool is_not; /* True if this entry is "no_initialize_domain". */ |
50 |
bool is_last_name; /* True if the domainname is ccs_get_last_name(). */ |
51 |
}; |
52 |
|
53 |
/* Structure for "keep_domain" and "no_keep_domain" keyword. */ |
54 |
struct domain_keeper_entry { |
55 |
struct list1_head list; |
56 |
const struct path_info *domainname; |
57 |
const struct path_info *program; /* This may be NULL */ |
58 |
bool is_deleted; |
59 |
bool is_not; /* True if this entry is "no_keep_domain". */ |
60 |
bool is_last_name; /* True if the domainname is ccs_get_last_name(). */ |
61 |
}; |
62 |
|
63 |
/* Structure for "aggregator" keyword. */ |
64 |
struct aggregator_entry { |
65 |
struct list1_head list; |
66 |
const struct path_info *original_name; |
67 |
const struct path_info *aggregated_name; |
68 |
bool is_deleted; |
69 |
}; |
70 |
|
71 |
/* Structure for "alias" keyword. */ |
72 |
struct alias_entry { |
73 |
struct list1_head list; |
74 |
const struct path_info *original_name; |
75 |
const struct path_info *aliased_name; |
76 |
bool is_deleted; |
77 |
}; |
78 |
|
79 |
/** |
80 |
* ccs_set_domain_flag - Set or clear domain's attribute flags. |
81 |
* |
82 |
* @domain: Pointer to "struct domain_info". |
83 |
* @is_delete: True if it is a delete request. |
84 |
* @flags: Flags to set or clear. |
85 |
* |
86 |
* Returns nothing. |
87 |
*/ |
88 |
void ccs_set_domain_flag(struct domain_info *domain, const bool is_delete, |
89 |
const u8 flags) |
90 |
{ |
91 |
mutex_lock(&new_domain_assign_lock); |
92 |
if (!is_delete) |
93 |
domain->flags |= flags; |
94 |
else |
95 |
domain->flags &= ~flags; |
96 |
mutex_unlock(&new_domain_assign_lock); |
97 |
} |
98 |
|
99 |
/** |
100 |
* ccs_get_last_name - Get last component of a domainname. |
101 |
* |
102 |
* @domain: Pointer to "struct domain_info". |
103 |
* |
104 |
* Returns the last component of the domainname. |
105 |
*/ |
106 |
const char *ccs_get_last_name(const struct domain_info *domain) |
107 |
{ |
108 |
const char *cp0 = domain->domainname->name; |
109 |
const char *cp1 = strrchr(cp0, ' '); |
110 |
if (cp1) |
111 |
return cp1 + 1; |
112 |
return cp0; |
113 |
} |
114 |
|
115 |
/** |
116 |
* ccs_add_domain_acl - Add the given ACL to the given domain. |
117 |
* |
118 |
* @domain: Pointer to "struct domain_info". May be NULL. |
119 |
* @acl: Pointer to "struct acl_info". |
120 |
* |
121 |
* Returns 0. |
122 |
*/ |
123 |
int ccs_add_domain_acl(struct domain_info *domain, struct acl_info *acl) |
124 |
{ |
125 |
if (domain) { |
126 |
/* |
127 |
* We need to serialize because this function is called by |
128 |
* various update functions. |
129 |
*/ |
130 |
static DEFINE_SPINLOCK(lock); |
131 |
/***** CRITICAL SECTION START *****/ |
132 |
spin_lock(&lock); |
133 |
list1_add_tail_mb(&acl->list, &domain->acl_info_list); |
134 |
spin_unlock(&lock); |
135 |
/***** CRITICAL SECTION END *****/ |
136 |
} else { |
137 |
acl->type &= ~ACL_DELETED; |
138 |
} |
139 |
ccs_update_counter(CCS_UPDATES_COUNTER_DOMAIN_POLICY); |
140 |
return 0; |
141 |
} |
142 |
|
143 |
/** |
144 |
* ccs_del_domain_acl - Delete the given ACL from the domain. |
145 |
* |
146 |
* @acl: Pointer to "struct acl_info". May be NULL. |
147 |
* |
148 |
* Returns 0. |
149 |
*/ |
150 |
int ccs_del_domain_acl(struct acl_info *acl) |
151 |
{ |
152 |
if (acl) |
153 |
acl->type |= ACL_DELETED; |
154 |
ccs_update_counter(CCS_UPDATES_COUNTER_DOMAIN_POLICY); |
155 |
return 0; |
156 |
} |
157 |
|
158 |
/** |
159 |
* audit_execute_handler_log - Audit execute_handler log. |
160 |
* |
161 |
* @is_default: True if it is "execute_handler" log. |
162 |
* @handler: The realpath of the handler. |
163 |
* @bprm: Pointer to "struct linux_binprm". |
164 |
* |
165 |
* Returns 0 on success, negative value otherwise. |
166 |
*/ |
167 |
static int audit_execute_handler_log(const bool is_default, |
168 |
const char *handler, |
169 |
struct linux_binprm *bprm) |
170 |
{ |
171 |
struct ccs_request_info r; |
172 |
ccs_init_request_info(&r, NULL, CCS_TOMOYO_MAC_FOR_FILE); |
173 |
r.bprm = bprm; |
174 |
return ccs_write_audit_log(true, &r, "%s %s\n", |
175 |
is_default ? KEYWORD_EXECUTE_HANDLER : |
176 |
KEYWORD_DENIED_EXECUTE_HANDLER, handler); |
177 |
} |
178 |
|
179 |
/** |
180 |
* audit_domain_creation_log - Audit domain creation log. |
181 |
* |
182 |
* @domain: Pointer to "struct domain_info". |
183 |
* |
184 |
* Returns 0 on success, negative value otherwise. |
185 |
*/ |
186 |
static int audit_domain_creation_log(struct domain_info *domain) |
187 |
{ |
188 |
struct ccs_request_info r; |
189 |
ccs_init_request_info(&r, domain, CCS_TOMOYO_MAC_FOR_FILE); |
190 |
return ccs_write_audit_log(false, &r, "use_profile %u\n", r.profile); |
191 |
} |
192 |
|
193 |
/* The list for "struct domain_initializer_entry". */ |
194 |
static LIST1_HEAD(domain_initializer_list); |
195 |
|
196 |
/** |
197 |
* update_domain_initializer_entry - Update "struct domain_initializer_entry" list. |
198 |
* |
199 |
* @domainname: The name of domain. May be NULL. |
200 |
* @program: The name of program. |
201 |
* @is_not: True if it is "no_initialize_domain" entry. |
202 |
* @is_delete: True if it is a delete request. |
203 |
* |
204 |
* Returns 0 on success, negative value otherwise. |
205 |
*/ |
206 |
static int update_domain_initializer_entry(const char *domainname, |
207 |
const char *program, |
208 |
const bool is_not, |
209 |
const bool is_delete) |
210 |
{ |
211 |
struct domain_initializer_entry *new_entry; |
212 |
struct domain_initializer_entry *ptr; |
213 |
static DEFINE_MUTEX(lock); |
214 |
const struct path_info *saved_program; |
215 |
const struct path_info *saved_domainname = NULL; |
216 |
int error = -ENOMEM; |
217 |
bool is_last_name = false; |
218 |
if (!ccs_is_correct_path(program, 1, -1, -1, __func__)) |
219 |
return -EINVAL; /* No patterns allowed. */ |
220 |
if (domainname) { |
221 |
if (!ccs_is_domain_def(domainname) && |
222 |
ccs_is_correct_path(domainname, 1, -1, -1, __func__)) |
223 |
is_last_name = true; |
224 |
else if (!ccs_is_correct_domain(domainname, __func__)) |
225 |
return -EINVAL; |
226 |
saved_domainname = ccs_save_name(domainname); |
227 |
if (!saved_domainname) |
228 |
return -ENOMEM; |
229 |
} |
230 |
saved_program = ccs_save_name(program); |
231 |
if (!saved_program) |
232 |
return -ENOMEM; |
233 |
mutex_lock(&lock); |
234 |
list1_for_each_entry(ptr, &domain_initializer_list, list) { |
235 |
if (ptr->is_not != is_not || |
236 |
ptr->domainname != saved_domainname || |
237 |
ptr->program != saved_program) |
238 |
continue; |
239 |
ptr->is_deleted = is_delete; |
240 |
error = 0; |
241 |
goto out; |
242 |
} |
243 |
if (is_delete) { |
244 |
error = -ENOENT; |
245 |
goto out; |
246 |
} |
247 |
new_entry = ccs_alloc_element(sizeof(*new_entry)); |
248 |
if (!new_entry) |
249 |
goto out; |
250 |
new_entry->domainname = saved_domainname; |
251 |
new_entry->program = saved_program; |
252 |
new_entry->is_not = is_not; |
253 |
new_entry->is_last_name = is_last_name; |
254 |
list1_add_tail_mb(&new_entry->list, &domain_initializer_list); |
255 |
error = 0; |
256 |
out: |
257 |
mutex_unlock(&lock); |
258 |
ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
259 |
return error; |
260 |
} |
261 |
|
262 |
/** |
263 |
* ccs_read_domain_initializer_policy - Read "struct domain_initializer_entry" list. |
264 |
* |
265 |
* @head: Pointer to "struct ccs_io_buffer". |
266 |
* |
267 |
* Returns true on success, false otherwise. |
268 |
*/ |
269 |
bool ccs_read_domain_initializer_policy(struct ccs_io_buffer *head) |
270 |
{ |
271 |
struct list1_head *pos; |
272 |
list1_for_each_cookie(pos, head->read_var2, &domain_initializer_list) { |
273 |
const char *no; |
274 |
const char *from = ""; |
275 |
const char *domain = ""; |
276 |
struct domain_initializer_entry *ptr; |
277 |
ptr = list1_entry(pos, struct domain_initializer_entry, list); |
278 |
if (ptr->is_deleted) |
279 |
continue; |
280 |
no = ptr->is_not ? "no_" : ""; |
281 |
if (ptr->domainname) { |
282 |
from = " from "; |
283 |
domain = ptr->domainname->name; |
284 |
} |
285 |
if (!ccs_io_printf(head, |
286 |
"%s" KEYWORD_INITIALIZE_DOMAIN "%s%s%s\n", |
287 |
no, ptr->program->name, from, domain)) |
288 |
goto out; |
289 |
} |
290 |
return true; |
291 |
out: |
292 |
return false; |
293 |
} |
294 |
|
295 |
/** |
296 |
* ccs_write_domain_initializer_policy - Write "struct domain_initializer_entry" list. |
297 |
* |
298 |
* @data: String to parse. |
299 |
* @is_not: True if it is "no_initialize_domain" entry. |
300 |
* @is_delete: True if it is a delete request. |
301 |
* |
302 |
* Returns 0 on success, negative value otherwise. |
303 |
*/ |
304 |
int ccs_write_domain_initializer_policy(char *data, const bool is_not, |
305 |
const bool is_delete) |
306 |
{ |
307 |
char *cp = strstr(data, " from "); |
308 |
if (cp) { |
309 |
*cp = '\0'; |
310 |
return update_domain_initializer_entry(cp + 6, data, is_not, |
311 |
is_delete); |
312 |
} |
313 |
return update_domain_initializer_entry(NULL, data, is_not, is_delete); |
314 |
} |
315 |
|
316 |
/** |
317 |
* is_domain_initializer - Check whether the given program causes domainname reinitialization. |
318 |
* |
319 |
* @domainname: The name of domain. |
320 |
* @program: The name of program. |
321 |
* @last_name: The last component of @domainname. |
322 |
* |
323 |
* Returns true if executing @program reinitializes domain transition, |
324 |
* false otherwise. |
325 |
*/ |
326 |
static bool is_domain_initializer(const struct path_info *domainname, |
327 |
const struct path_info *program, |
328 |
const struct path_info *last_name) |
329 |
{ |
330 |
struct domain_initializer_entry *ptr; |
331 |
bool flag = false; |
332 |
list1_for_each_entry(ptr, &domain_initializer_list, list) { |
333 |
if (ptr->is_deleted) |
334 |
continue; |
335 |
if (ptr->domainname) { |
336 |
if (!ptr->is_last_name) { |
337 |
if (ptr->domainname != domainname) |
338 |
continue; |
339 |
} else { |
340 |
if (ccs_pathcmp(ptr->domainname, last_name)) |
341 |
continue; |
342 |
} |
343 |
} |
344 |
if (ccs_pathcmp(ptr->program, program)) |
345 |
continue; |
346 |
if (ptr->is_not) |
347 |
return false; |
348 |
flag = true; |
349 |
} |
350 |
return flag; |
351 |
} |
352 |
|
353 |
/* The list for "struct domain_keeper_entry". */ |
354 |
static LIST1_HEAD(domain_keeper_list); |
355 |
|
356 |
/** |
357 |
* update_domain_keeper_entry - Update "struct domain_keeper_entry" list. |
358 |
* |
359 |
* @domainname: The name of domain. |
360 |
* @program: The name of program. May be NULL. |
361 |
* @is_not: True if it is "no_keep_domain" entry. |
362 |
* @is_delete: True if it is a delete request. |
363 |
* |
364 |
* Returns 0 on success, negative value otherwise. |
365 |
*/ |
366 |
static int update_domain_keeper_entry(const char *domainname, |
367 |
const char *program, |
368 |
const bool is_not, const bool is_delete) |
369 |
{ |
370 |
struct domain_keeper_entry *new_entry; |
371 |
struct domain_keeper_entry *ptr; |
372 |
const struct path_info *saved_domainname; |
373 |
const struct path_info *saved_program = NULL; |
374 |
static DEFINE_MUTEX(lock); |
375 |
int error = -ENOMEM; |
376 |
bool is_last_name = false; |
377 |
if (!ccs_is_domain_def(domainname) && |
378 |
ccs_is_correct_path(domainname, 1, -1, -1, __func__)) |
379 |
is_last_name = true; |
380 |
else if (!ccs_is_correct_domain(domainname, __func__)) |
381 |
return -EINVAL; |
382 |
if (program) { |
383 |
if (!ccs_is_correct_path(program, 1, -1, -1, __func__)) |
384 |
return -EINVAL; |
385 |
saved_program = ccs_save_name(program); |
386 |
if (!saved_program) |
387 |
return -ENOMEM; |
388 |
} |
389 |
saved_domainname = ccs_save_name(domainname); |
390 |
if (!saved_domainname) |
391 |
return -ENOMEM; |
392 |
mutex_lock(&lock); |
393 |
list1_for_each_entry(ptr, &domain_keeper_list, list) { |
394 |
if (ptr->is_not != is_not || |
395 |
ptr->domainname != saved_domainname || |
396 |
ptr->program != saved_program) |
397 |
continue; |
398 |
ptr->is_deleted = is_delete; |
399 |
error = 0; |
400 |
goto out; |
401 |
} |
402 |
if (is_delete) { |
403 |
error = -ENOENT; |
404 |
goto out; |
405 |
} |
406 |
new_entry = ccs_alloc_element(sizeof(*new_entry)); |
407 |
if (!new_entry) |
408 |
goto out; |
409 |
new_entry->domainname = saved_domainname; |
410 |
new_entry->program = saved_program; |
411 |
new_entry->is_not = is_not; |
412 |
new_entry->is_last_name = is_last_name; |
413 |
list1_add_tail_mb(&new_entry->list, &domain_keeper_list); |
414 |
error = 0; |
415 |
out: |
416 |
mutex_unlock(&lock); |
417 |
ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
418 |
return error; |
419 |
} |
420 |
|
421 |
/** |
422 |
* ccs_write_domain_keeper_policy - Write "struct domain_keeper_entry" list. |
423 |
* |
424 |
* @data: String to parse. |
425 |
* @is_not: True if it is "no_keep_domain" entry. |
426 |
* @is_delete: True if it is a delete request. |
427 |
* |
428 |
*/ |
429 |
int ccs_write_domain_keeper_policy(char *data, const bool is_not, |
430 |
const bool is_delete) |
431 |
{ |
432 |
char *cp = strstr(data, " from "); |
433 |
if (cp) { |
434 |
*cp = '\0'; |
435 |
return update_domain_keeper_entry(cp + 6, data, |
436 |
is_not, is_delete); |
437 |
} |
438 |
return update_domain_keeper_entry(data, NULL, is_not, is_delete); |
439 |
} |
440 |
|
441 |
/** |
442 |
* ccs_read_domain_keeper_policy - Read "struct domain_keeper_entry" list. |
443 |
* |
444 |
* @head: Pointer to "struct ccs_io_buffer". |
445 |
* |
446 |
* Returns true on success, false otherwise. |
447 |
*/ |
448 |
bool ccs_read_domain_keeper_policy(struct ccs_io_buffer *head) |
449 |
{ |
450 |
struct list1_head *pos; |
451 |
list1_for_each_cookie(pos, head->read_var2, &domain_keeper_list) { |
452 |
struct domain_keeper_entry *ptr; |
453 |
const char *no; |
454 |
const char *from = ""; |
455 |
const char *program = ""; |
456 |
ptr = list1_entry(pos, struct domain_keeper_entry, list); |
457 |
if (ptr->is_deleted) |
458 |
continue; |
459 |
no = ptr->is_not ? "no_" : ""; |
460 |
if (ptr->program) { |
461 |
from = " from "; |
462 |
program = ptr->program->name; |
463 |
} |
464 |
if (!ccs_io_printf(head, |
465 |
"%s" KEYWORD_KEEP_DOMAIN "%s%s%s\n", no, |
466 |
program, from, ptr->domainname->name)) |
467 |
goto out; |
468 |
} |
469 |
return true; |
470 |
out: |
471 |
return false; |
472 |
} |
473 |
|
474 |
/** |
475 |
* is_domain_keeper - Check whether the given program causes domain transition suppression. |
476 |
* |
477 |
* @domainname: The name of domain. |
478 |
* @program: The name of program. |
479 |
* @last_name: The last component of @domainname. |
480 |
* |
481 |
* Returns true if executing @program supresses domain transition, |
482 |
* false otherwise. |
483 |
*/ |
484 |
static bool is_domain_keeper(const struct path_info *domainname, |
485 |
const struct path_info *program, |
486 |
const struct path_info *last_name) |
487 |
{ |
488 |
struct domain_keeper_entry *ptr; |
489 |
bool flag = false; |
490 |
list1_for_each_entry(ptr, &domain_keeper_list, list) { |
491 |
if (ptr->is_deleted) |
492 |
continue; |
493 |
if (!ptr->is_last_name) { |
494 |
if (ptr->domainname != domainname) |
495 |
continue; |
496 |
} else { |
497 |
if (ccs_pathcmp(ptr->domainname, last_name)) |
498 |
continue; |
499 |
} |
500 |
if (ptr->program && ccs_pathcmp(ptr->program, program)) |
501 |
continue; |
502 |
if (ptr->is_not) |
503 |
return false; |
504 |
flag = true; |
505 |
} |
506 |
return flag; |
507 |
} |
508 |
|
509 |
/* The list for "struct alias_entry". */ |
510 |
static LIST1_HEAD(alias_list); |
511 |
|
512 |
/** |
513 |
* update_alias_entry - Update "struct alias_entry" list. |
514 |
* |
515 |
* @original_name: The original program's real name. |
516 |
* @aliased_name: The symbolic program's symbolic link's name. |
517 |
* @is_delete: True if it is a delete request. |
518 |
* |
519 |
* Returns 0 on success, negative value otherwise. |
520 |
*/ |
521 |
static int update_alias_entry(const char *original_name, |
522 |
const char *aliased_name, |
523 |
const bool is_delete) |
524 |
{ |
525 |
struct alias_entry *new_entry; |
526 |
struct alias_entry *ptr; |
527 |
static DEFINE_MUTEX(lock); |
528 |
const struct path_info *saved_original_name; |
529 |
const struct path_info *saved_aliased_name; |
530 |
int error = -ENOMEM; |
531 |
if (!ccs_is_correct_path(original_name, 1, -1, -1, __func__) || |
532 |
!ccs_is_correct_path(aliased_name, 1, -1, -1, __func__)) |
533 |
return -EINVAL; /* No patterns allowed. */ |
534 |
saved_original_name = ccs_save_name(original_name); |
535 |
saved_aliased_name = ccs_save_name(aliased_name); |
536 |
if (!saved_original_name || !saved_aliased_name) |
537 |
return -ENOMEM; |
538 |
mutex_lock(&lock); |
539 |
list1_for_each_entry(ptr, &alias_list, list) { |
540 |
if (ptr->original_name != saved_original_name || |
541 |
ptr->aliased_name != saved_aliased_name) |
542 |
continue; |
543 |
ptr->is_deleted = is_delete; |
544 |
error = 0; |
545 |
goto out; |
546 |
} |
547 |
if (is_delete) { |
548 |
error = -ENOENT; |
549 |
goto out; |
550 |
} |
551 |
new_entry = ccs_alloc_element(sizeof(*new_entry)); |
552 |
if (!new_entry) |
553 |
goto out; |
554 |
new_entry->original_name = saved_original_name; |
555 |
new_entry->aliased_name = saved_aliased_name; |
556 |
list1_add_tail_mb(&new_entry->list, &alias_list); |
557 |
error = 0; |
558 |
out: |
559 |
mutex_unlock(&lock); |
560 |
ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
561 |
return error; |
562 |
} |
563 |
|
564 |
/** |
565 |
* ccs_read_alias_policy - Read "struct alias_entry" list. |
566 |
* |
567 |
* @head: Pointer to "struct ccs_io_buffer". |
568 |
* |
569 |
* Returns true on success, false otherwise. |
570 |
*/ |
571 |
bool ccs_read_alias_policy(struct ccs_io_buffer *head) |
572 |
{ |
573 |
struct list1_head *pos; |
574 |
list1_for_each_cookie(pos, head->read_var2, &alias_list) { |
575 |
struct alias_entry *ptr; |
576 |
ptr = list1_entry(pos, struct alias_entry, list); |
577 |
if (ptr->is_deleted) |
578 |
continue; |
579 |
if (!ccs_io_printf(head, KEYWORD_ALIAS "%s %s\n", |
580 |
ptr->original_name->name, |
581 |
ptr->aliased_name->name)) |
582 |
goto out; |
583 |
} |
584 |
return true; |
585 |
out: |
586 |
return false; |
587 |
} |
588 |
|
589 |
/** |
590 |
* ccs_write_alias_policy - Write "struct alias_entry" list. |
591 |
* |
592 |
* @data: String to parse. |
593 |
* @is_delete: True if it is a delete request. |
594 |
* |
595 |
* Returns 0 on success, negative value otherwise. |
596 |
*/ |
597 |
int ccs_write_alias_policy(char *data, const bool is_delete) |
598 |
{ |
599 |
char *cp = strchr(data, ' '); |
600 |
if (!cp) |
601 |
return -EINVAL; |
602 |
*cp++ = '\0'; |
603 |
return update_alias_entry(data, cp, is_delete); |
604 |
} |
605 |
|
606 |
/* The list for "struct aggregator_entry". */ |
607 |
static LIST1_HEAD(aggregator_list); |
608 |
|
609 |
/** |
610 |
* update_aggregator_entry - Update "struct aggregator_entry" list. |
611 |
* |
612 |
* @original_name: The original program's name. |
613 |
* @aggregated_name: The aggregated program's name. |
614 |
* @is_delete: True if it is a delete request. |
615 |
* |
616 |
* Returns 0 on success, negative value otherwise. |
617 |
*/ |
618 |
static int update_aggregator_entry(const char *original_name, |
619 |
const char *aggregated_name, |
620 |
const bool is_delete) |
621 |
{ |
622 |
struct aggregator_entry *new_entry; |
623 |
struct aggregator_entry *ptr; |
624 |
static DEFINE_MUTEX(lock); |
625 |
const struct path_info *saved_original_name; |
626 |
const struct path_info *saved_aggregated_name; |
627 |
int error = -ENOMEM; |
628 |
if (!ccs_is_correct_path(original_name, 1, 0, -1, __func__) || |
629 |
!ccs_is_correct_path(aggregated_name, 1, -1, -1, __func__)) |
630 |
return -EINVAL; |
631 |
saved_original_name = ccs_save_name(original_name); |
632 |
saved_aggregated_name = ccs_save_name(aggregated_name); |
633 |
if (!saved_original_name || !saved_aggregated_name) |
634 |
return -ENOMEM; |
635 |
mutex_lock(&lock); |
636 |
list1_for_each_entry(ptr, &aggregator_list, list) { |
637 |
if (ptr->original_name != saved_original_name || |
638 |
ptr->aggregated_name != saved_aggregated_name) |
639 |
continue; |
640 |
ptr->is_deleted = is_delete; |
641 |
error = 0; |
642 |
goto out; |
643 |
} |
644 |
if (is_delete) { |
645 |
error = -ENOENT; |
646 |
goto out; |
647 |
} |
648 |
new_entry = ccs_alloc_element(sizeof(*new_entry)); |
649 |
if (!new_entry) |
650 |
goto out; |
651 |
new_entry->original_name = saved_original_name; |
652 |
new_entry->aggregated_name = saved_aggregated_name; |
653 |
list1_add_tail_mb(&new_entry->list, &aggregator_list); |
654 |
error = 0; |
655 |
out: |
656 |
mutex_unlock(&lock); |
657 |
ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
658 |
return error; |
659 |
} |
660 |
|
661 |
/** |
662 |
* ccs_read_aggregator_policy - Read "struct aggregator_entry" list. |
663 |
* |
664 |
* @head: Pointer to "struct ccs_io_buffer". |
665 |
* |
666 |
* Returns true on success, false otherwise. |
667 |
*/ |
668 |
bool ccs_read_aggregator_policy(struct ccs_io_buffer *head) |
669 |
{ |
670 |
struct list1_head *pos; |
671 |
list1_for_each_cookie(pos, head->read_var2, &aggregator_list) { |
672 |
struct aggregator_entry *ptr; |
673 |
ptr = list1_entry(pos, struct aggregator_entry, list); |
674 |
if (ptr->is_deleted) |
675 |
continue; |
676 |
if (!ccs_io_printf(head, KEYWORD_AGGREGATOR "%s %s\n", |
677 |
ptr->original_name->name, |
678 |
ptr->aggregated_name->name)) |
679 |
goto out; |
680 |
} |
681 |
return true; |
682 |
out: |
683 |
return false; |
684 |
} |
685 |
|
686 |
/** |
687 |
* ccs_write_aggregator_policy - Write "struct aggregator_entry" list. |
688 |
* |
689 |
* @data: String to parse. |
690 |
* @is_delete: True if it is a delete request. |
691 |
* |
692 |
* Returns 0 on success, negative value otherwise. |
693 |
*/ |
694 |
int ccs_write_aggregator_policy(char *data, const bool is_delete) |
695 |
{ |
696 |
char *cp = strchr(data, ' '); |
697 |
if (!cp) |
698 |
return -EINVAL; |
699 |
*cp++ = '\0'; |
700 |
return update_aggregator_entry(data, cp, is_delete); |
701 |
} |
702 |
|
703 |
/* Domain create/delete/undelete handler. */ |
704 |
|
705 |
/* #define DEBUG_DOMAIN_UNDELETE */ |
706 |
|
707 |
/** |
708 |
* ccs_delete_domain - Delete a domain. |
709 |
* |
710 |
* @domainname: The name of domain. |
711 |
* |
712 |
* Returns 0. |
713 |
*/ |
714 |
int ccs_delete_domain(char *domainname) |
715 |
{ |
716 |
struct domain_info *domain; |
717 |
struct path_info name; |
718 |
name.name = domainname; |
719 |
ccs_fill_path_info(&name); |
720 |
mutex_lock(&new_domain_assign_lock); |
721 |
#ifdef DEBUG_DOMAIN_UNDELETE |
722 |
printk(KERN_DEBUG "ccs_delete_domain %s\n", domainname); |
723 |
list1_for_each_entry(domain, &domain_list, list) { |
724 |
if (ccs_pathcmp(domain->domainname, &name)) |
725 |
continue; |
726 |
printk(KERN_DEBUG "List: %p %u\n", domain, domain->is_deleted); |
727 |
} |
728 |
#endif |
729 |
/* Is there an active domain? */ |
730 |
list1_for_each_entry(domain, &domain_list, list) { |
731 |
struct domain_info *domain2; |
732 |
/* Never delete KERNEL_DOMAIN */ |
733 |
if (domain == &KERNEL_DOMAIN) |
734 |
continue; |
735 |
if (domain->is_deleted || |
736 |
ccs_pathcmp(domain->domainname, &name)) |
737 |
continue; |
738 |
/* Mark already deleted domains as non undeletable. */ |
739 |
list1_for_each_entry(domain2, &domain_list, list) { |
740 |
if (!domain2->is_deleted || |
741 |
ccs_pathcmp(domain2->domainname, &name)) |
742 |
continue; |
743 |
#ifdef DEBUG_DOMAIN_UNDELETE |
744 |
if (domain2->is_deleted != 255) |
745 |
printk(KERN_DEBUG |
746 |
"Marked %p as non undeletable\n", |
747 |
domain2); |
748 |
#endif |
749 |
domain2->is_deleted = 255; |
750 |
} |
751 |
/* Delete and mark active domain as undeletable. */ |
752 |
domain->is_deleted = 1; |
753 |
#ifdef DEBUG_DOMAIN_UNDELETE |
754 |
printk(KERN_DEBUG "Marked %p as undeletable\n", domain); |
755 |
#endif |
756 |
break; |
757 |
} |
758 |
mutex_unlock(&new_domain_assign_lock); |
759 |
return 0; |
760 |
} |
761 |
|
762 |
/** |
763 |
* ccs_undelete_domain - Undelete a domain. |
764 |
* |
765 |
* @domainname: The name of domain. |
766 |
* |
767 |
* Returns pointer to "struct domain_info" on success, NULL otherwise. |
768 |
*/ |
769 |
struct domain_info *ccs_undelete_domain(const char *domainname) |
770 |
{ |
771 |
struct domain_info *domain; |
772 |
struct domain_info *candidate_domain = NULL; |
773 |
struct path_info name; |
774 |
name.name = domainname; |
775 |
ccs_fill_path_info(&name); |
776 |
mutex_lock(&new_domain_assign_lock); |
777 |
#ifdef DEBUG_DOMAIN_UNDELETE |
778 |
printk(KERN_DEBUG "ccs_undelete_domain %s\n", domainname); |
779 |
list1_for_each_entry(domain, &domain_list, list) { |
780 |
if (ccs_pathcmp(domain->domainname, &name)) |
781 |
continue; |
782 |
printk(KERN_DEBUG "List: %p %u\n", domain, domain->is_deleted); |
783 |
} |
784 |
#endif |
785 |
list1_for_each_entry(domain, &domain_list, list) { |
786 |
if (ccs_pathcmp(&name, domain->domainname)) |
787 |
continue; |
788 |
if (!domain->is_deleted) { |
789 |
/* This domain is active. I can't undelete. */ |
790 |
candidate_domain = NULL; |
791 |
#ifdef DEBUG_DOMAIN_UNDELETE |
792 |
printk(KERN_DEBUG "%p is active. I can't undelete.\n", |
793 |
domain); |
794 |
#endif |
795 |
break; |
796 |
} |
797 |
/* Is this domain undeletable? */ |
798 |
if (domain->is_deleted == 1) |
799 |
candidate_domain = domain; |
800 |
} |
801 |
if (candidate_domain) { |
802 |
candidate_domain->is_deleted = 0; |
803 |
#ifdef DEBUG_DOMAIN_UNDELETE |
804 |
printk(KERN_DEBUG "%p was undeleted.\n", candidate_domain); |
805 |
#endif |
806 |
} |
807 |
mutex_unlock(&new_domain_assign_lock); |
808 |
return candidate_domain; |
809 |
} |
810 |
|
811 |
/** |
812 |
* ccs_find_or_assign_new_domain - Create a domain. |
813 |
* |
814 |
* @domainname: The name of domain. |
815 |
* @profile: Profile number to assign if the domain was newly created. |
816 |
* |
817 |
* Returns pointer to "struct domain_info" on success, NULL otherwise. |
818 |
*/ |
819 |
struct domain_info *ccs_find_or_assign_new_domain(const char *domainname, |
820 |
const u8 profile) |
821 |
{ |
822 |
struct domain_info *domain = NULL; |
823 |
const struct path_info *saved_domainname; |
824 |
mutex_lock(&new_domain_assign_lock); |
825 |
domain = ccs_find_domain(domainname); |
826 |
if (domain) |
827 |
goto out; |
828 |
if (!ccs_is_correct_domain(domainname, __func__)) |
829 |
goto out; |
830 |
saved_domainname = ccs_save_name(domainname); |
831 |
if (!saved_domainname) |
832 |
goto out; |
833 |
/* Can I reuse memory of deleted domain? */ |
834 |
list1_for_each_entry(domain, &domain_list, list) { |
835 |
struct task_struct *p; |
836 |
struct acl_info *ptr; |
837 |
bool flag; |
838 |
if (!domain->is_deleted || |
839 |
domain->domainname != saved_domainname) |
840 |
continue; |
841 |
flag = false; |
842 |
/***** CRITICAL SECTION START *****/ |
843 |
read_lock(&tasklist_lock); |
844 |
for_each_process(p) { |
845 |
if (p->domain_info != domain) |
846 |
continue; |
847 |
flag = true; |
848 |
break; |
849 |
} |
850 |
read_unlock(&tasklist_lock); |
851 |
/***** CRITICAL SECTION END *****/ |
852 |
if (flag) |
853 |
continue; |
854 |
#ifdef DEBUG_DOMAIN_UNDELETE |
855 |
printk(KERN_DEBUG "Reusing %p %s\n", domain, |
856 |
domain->domainname->name); |
857 |
#endif |
858 |
list1_for_each_entry(ptr, &domain->acl_info_list, list) { |
859 |
ptr->type |= ACL_DELETED; |
860 |
} |
861 |
/* |
862 |
* Don't use ccs_set_domain_flag() because |
863 |
* new_domain_assign_lock is held. |
864 |
*/ |
865 |
domain->flags = 0; |
866 |
domain->profile = profile; |
867 |
domain->quota_warned = false; |
868 |
mb(); /* Avoid out-of-order execution. */ |
869 |
domain->is_deleted = 0; |
870 |
goto out; |
871 |
} |
872 |
/* No memory reusable. Create using new memory. */ |
873 |
domain = ccs_alloc_element(sizeof(*domain)); |
874 |
if (domain) { |
875 |
INIT_LIST1_HEAD(&domain->acl_info_list); |
876 |
domain->domainname = saved_domainname; |
877 |
domain->profile = profile; |
878 |
list1_add_tail_mb(&domain->list, &domain_list); |
879 |
} |
880 |
out: |
881 |
mutex_unlock(&new_domain_assign_lock); |
882 |
return domain; |
883 |
} |
884 |
|
885 |
/** |
886 |
* get_argv0 - Get argv[0]. |
887 |
* |
888 |
* @bprm: Pointer to "struct linux_binprm". |
889 |
* @tmp: Buffer for temporal use. |
890 |
* |
891 |
* Returns true on success, false otherwise. |
892 |
*/ |
893 |
static bool get_argv0(struct linux_binprm *bprm, struct ccs_page_buffer *tmp) |
894 |
{ |
895 |
char *arg_ptr = tmp->buffer; |
896 |
int arg_len = 0; |
897 |
unsigned long pos = bprm->p; |
898 |
int i = pos / PAGE_SIZE; |
899 |
int offset = pos % PAGE_SIZE; |
900 |
bool done = false; |
901 |
if (!bprm->argc) |
902 |
goto out; |
903 |
while (1) { |
904 |
struct page *page; |
905 |
const char *kaddr; |
906 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
907 |
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, |
908 |
NULL) <= 0) |
909 |
goto out; |
910 |
pos += PAGE_SIZE - offset; |
911 |
#else |
912 |
page = bprm->page[i]; |
913 |
#endif |
914 |
/* Map. */ |
915 |
kaddr = kmap(page); |
916 |
if (!kaddr) { /* Mapping failed. */ |
917 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
918 |
put_page(page); |
919 |
#endif |
920 |
goto out; |
921 |
} |
922 |
/* Read. */ |
923 |
while (offset < PAGE_SIZE) { |
924 |
const unsigned char c = kaddr[offset++]; |
925 |
if (c && arg_len < CCS_MAX_PATHNAME_LEN - 10) { |
926 |
if (c == '\\') { |
927 |
arg_ptr[arg_len++] = '\\'; |
928 |
arg_ptr[arg_len++] = '\\'; |
929 |
} else if (c == '/') { |
930 |
arg_len = 0; |
931 |
} else if (c > ' ' && c < 127) { |
932 |
arg_ptr[arg_len++] = c; |
933 |
} else { |
934 |
arg_ptr[arg_len++] = '\\'; |
935 |
arg_ptr[arg_len++] = (c >> 6) + '0'; |
936 |
arg_ptr[arg_len++] |
937 |
= ((c >> 3) & 7) + '0'; |
938 |
arg_ptr[arg_len++] = (c & 7) + '0'; |
939 |
} |
940 |
} else { |
941 |
arg_ptr[arg_len] = '\0'; |
942 |
done = true; |
943 |
break; |
944 |
} |
945 |
} |
946 |
/* Unmap. */ |
947 |
kunmap(page); |
948 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
949 |
put_page(page); |
950 |
#endif |
951 |
i++; |
952 |
offset = 0; |
953 |
if (done) |
954 |
break; |
955 |
} |
956 |
return true; |
957 |
out: |
958 |
return false; |
959 |
} |
960 |
|
961 |
/** |
962 |
* find_next_domain - Find a domain. |
963 |
* |
964 |
* @r: Pointer to "struct ccs_request_info". |
965 |
* @handler: Pathname to verify. May be NULL. |
966 |
* |
967 |
* Returns 0 on success, negative value otherwise. |
968 |
*/ |
969 |
static int find_next_domain(struct ccs_request_info *r, |
970 |
const struct path_info *handler) |
971 |
{ |
972 |
/* |
973 |
* This function assumes that the size of buffer returned by |
974 |
* ccs_realpath() = CCS_MAX_PATHNAME_LEN. |
975 |
*/ |
976 |
struct domain_info *domain = NULL; |
977 |
const char *old_domain_name = r->domain->domainname->name; |
978 |
struct linux_binprm *bprm = r->bprm; |
979 |
struct ccs_page_buffer *tmp = r->obj->tmp; |
980 |
const char *original_name = bprm->filename; |
981 |
const u8 mode = r->mode; |
982 |
const bool is_enforce = (mode == 3); |
983 |
const u32 tomoyo_flags = r->tomoyo_flags; |
984 |
char *new_domain_name = NULL; |
985 |
char *real_program_name = NULL; |
986 |
char *symlink_program_name = NULL; |
987 |
struct path_info rn; /* real name */ |
988 |
struct path_info sn; /* symlink name */ |
989 |
struct path_info ln; /* last name */ |
990 |
int retval; |
991 |
|
992 |
{ |
993 |
/* |
994 |
* Built-in initializers. This is needed because policies are |
995 |
* not loaded until starting /sbin/init. |
996 |
*/ |
997 |
static bool first = true; |
998 |
if (first) { |
999 |
update_domain_initializer_entry(NULL, "/sbin/hotplug", |
1000 |
false, false); |
1001 |
update_domain_initializer_entry(NULL, "/sbin/modprobe", |
1002 |
false, false); |
1003 |
first = false; |
1004 |
} |
1005 |
} |
1006 |
|
1007 |
retry: |
1008 |
current->tomoyo_flags = tomoyo_flags; |
1009 |
r->tomoyo_flags = tomoyo_flags; |
1010 |
/* Get ccs_realpath of program. */ |
1011 |
retval = -ENOENT; /* I hope ccs_realpath() won't fail with -ENOMEM. */ |
1012 |
ccs_free(real_program_name); |
1013 |
real_program_name = ccs_realpath(original_name); |
1014 |
if (!real_program_name) |
1015 |
goto out; |
1016 |
/* Get ccs_realpath of symbolic link. */ |
1017 |
ccs_free(symlink_program_name); |
1018 |
symlink_program_name = ccs_realpath_nofollow(original_name); |
1019 |
if (!symlink_program_name) |
1020 |
goto out; |
1021 |
|
1022 |
rn.name = real_program_name; |
1023 |
ccs_fill_path_info(&rn); |
1024 |
sn.name = symlink_program_name; |
1025 |
ccs_fill_path_info(&sn); |
1026 |
ln.name = ccs_get_last_name(r->domain); |
1027 |
ccs_fill_path_info(&ln); |
1028 |
|
1029 |
if (handler) { |
1030 |
if (ccs_pathcmp(&rn, handler)) { |
1031 |
/* Failed to verify execute handler. */ |
1032 |
static u8 counter = 20; |
1033 |
if (counter) { |
1034 |
counter--; |
1035 |
printk(KERN_WARNING "Failed to verify: %s\n", |
1036 |
handler->name); |
1037 |
} |
1038 |
goto out; |
1039 |
} |
1040 |
goto calculate_domain; |
1041 |
} |
1042 |
|
1043 |
/* Check 'alias' directive. */ |
1044 |
if (ccs_pathcmp(&rn, &sn)) { |
1045 |
struct alias_entry *ptr; |
1046 |
/* Is this program allowed to be called via symbolic links? */ |
1047 |
list1_for_each_entry(ptr, &alias_list, list) { |
1048 |
if (ptr->is_deleted || |
1049 |
ccs_pathcmp(&rn, ptr->original_name) || |
1050 |
ccs_pathcmp(&sn, ptr->aliased_name)) |
1051 |
continue; |
1052 |
memset(real_program_name, 0, CCS_MAX_PATHNAME_LEN); |
1053 |
strncpy(real_program_name, ptr->aliased_name->name, |
1054 |
CCS_MAX_PATHNAME_LEN - 1); |
1055 |
ccs_fill_path_info(&rn); |
1056 |
break; |
1057 |
} |
1058 |
} |
1059 |
|
1060 |
/* Compare basename of real_program_name and argv[0] */ |
1061 |
r->mode = ccs_check_flags(r->domain, CCS_TOMOYO_MAC_FOR_ARGV0); |
1062 |
if (bprm->argc > 0 && r->mode) { |
1063 |
char *base_argv0 = tmp->buffer; |
1064 |
const char *base_filename; |
1065 |
retval = -ENOMEM; |
1066 |
if (!get_argv0(bprm, tmp)) |
1067 |
goto out; |
1068 |
base_filename = strrchr(real_program_name, '/'); |
1069 |
if (!base_filename) |
1070 |
base_filename = real_program_name; |
1071 |
else |
1072 |
base_filename++; |
1073 |
if (strcmp(base_argv0, base_filename)) { |
1074 |
retval = ccs_check_argv0_perm(r, &rn, base_argv0); |
1075 |
if (retval == 1) { |
1076 |
r->retry++; |
1077 |
goto retry; |
1078 |
} |
1079 |
r->retry = 0; |
1080 |
r->tomoyo_flags = current->tomoyo_flags; |
1081 |
if (retval < 0) |
1082 |
goto out; |
1083 |
} |
1084 |
} |
1085 |
|
1086 |
/* Check 'aggregator' directive. */ |
1087 |
{ |
1088 |
struct aggregator_entry *ptr; |
1089 |
/* Is this program allowed to be aggregated? */ |
1090 |
list1_for_each_entry(ptr, &aggregator_list, list) { |
1091 |
if (ptr->is_deleted || |
1092 |
!ccs_path_matches_pattern(&rn, ptr->original_name)) |
1093 |
continue; |
1094 |
memset(real_program_name, 0, CCS_MAX_PATHNAME_LEN); |
1095 |
strncpy(real_program_name, ptr->aggregated_name->name, |
1096 |
CCS_MAX_PATHNAME_LEN - 1); |
1097 |
ccs_fill_path_info(&rn); |
1098 |
break; |
1099 |
} |
1100 |
} |
1101 |
|
1102 |
/* Check execute permission. */ |
1103 |
r->mode = mode; |
1104 |
retval = ccs_check_exec_perm(r, &rn); |
1105 |
if (retval == 1) { |
1106 |
r->retry++; |
1107 |
goto retry; |
1108 |
} |
1109 |
r->retry = 0; |
1110 |
r->tomoyo_flags = current->tomoyo_flags; |
1111 |
if (retval < 0) |
1112 |
goto out; |
1113 |
|
1114 |
calculate_domain: |
1115 |
new_domain_name = tmp->buffer; |
1116 |
if (is_domain_initializer(r->domain->domainname, &rn, &ln)) { |
1117 |
/* Transit to the child of KERNEL_DOMAIN domain. */ |
1118 |
snprintf(new_domain_name, CCS_MAX_PATHNAME_LEN + 1, |
1119 |
ROOT_NAME " " "%s", real_program_name); |
1120 |
} else if (r->domain == &KERNEL_DOMAIN && !sbin_init_started) { |
1121 |
/* |
1122 |
* Needn't to transit from kernel domain before starting |
1123 |
* /sbin/init. But transit from kernel domain if executing |
1124 |
* initializers because they might start before /sbin/init. |
1125 |
*/ |
1126 |
domain = r->domain; |
1127 |
} else if (is_domain_keeper(r->domain->domainname, &rn, &ln)) { |
1128 |
/* Keep current domain. */ |
1129 |
domain = r->domain; |
1130 |
} else { |
1131 |
/* Normal domain transition. */ |
1132 |
snprintf(new_domain_name, CCS_MAX_PATHNAME_LEN + 1, |
1133 |
"%s %s", old_domain_name, real_program_name); |
1134 |
} |
1135 |
if (domain || strlen(new_domain_name) >= CCS_MAX_PATHNAME_LEN) |
1136 |
goto done; |
1137 |
domain = ccs_find_domain(new_domain_name); |
1138 |
if (domain) |
1139 |
goto done; |
1140 |
if (is_enforce) { |
1141 |
int error = ccs_check_supervisor(r, |
1142 |
"# wants to create domain\n" |
1143 |
"%s\n", new_domain_name); |
1144 |
if (error == 1) { |
1145 |
r->retry++; |
1146 |
goto retry; |
1147 |
} |
1148 |
r->retry = 0; |
1149 |
if (error < 0) |
1150 |
goto done; |
1151 |
} |
1152 |
domain = ccs_find_or_assign_new_domain(new_domain_name, r->profile); |
1153 |
if (domain) |
1154 |
audit_domain_creation_log(domain); |
1155 |
done: |
1156 |
if (!domain) { |
1157 |
printk(KERN_WARNING "TOMOYO-ERROR: Domain '%s' not defined.\n", |
1158 |
new_domain_name); |
1159 |
if (is_enforce) |
1160 |
retval = -EPERM; |
1161 |
else { |
1162 |
retval = 0; |
1163 |
ccs_set_domain_flag(r->domain, false, |
1164 |
DOMAIN_FLAGS_TRANSITION_FAILED); |
1165 |
} |
1166 |
} else { |
1167 |
retval = 0; |
1168 |
} |
1169 |
out: |
1170 |
ccs_free(real_program_name); |
1171 |
ccs_free(symlink_program_name); |
1172 |
if (domain) |
1173 |
r->domain = domain; |
1174 |
return retval; |
1175 |
} |
1176 |
|
1177 |
/** |
1178 |
* check_environ - Check permission for environment variable names. |
1179 |
* |
1180 |
* @r: Pointer to "struct ccs_request_info". |
1181 |
* |
1182 |
* Returns 0 on success, negative value otherwise. |
1183 |
*/ |
1184 |
static int check_environ(struct ccs_request_info *r) |
1185 |
{ |
1186 |
struct linux_binprm *bprm = r->bprm; |
1187 |
struct ccs_page_buffer *tmp = r->obj->tmp; |
1188 |
char *arg_ptr = tmp->buffer; |
1189 |
int arg_len = 0; |
1190 |
unsigned long pos = bprm->p; |
1191 |
int i = pos / PAGE_SIZE; |
1192 |
int offset = pos % PAGE_SIZE; |
1193 |
int argv_count = bprm->argc; |
1194 |
int envp_count = bprm->envc; |
1195 |
/* printk(KERN_DEBUG "start %d %d\n", argv_count, envp_count); */ |
1196 |
int error = -ENOMEM; |
1197 |
if (!r->mode || !envp_count) |
1198 |
return 0; |
1199 |
while (error == -ENOMEM) { |
1200 |
struct page *page; |
1201 |
const char *kaddr; |
1202 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
1203 |
if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, |
1204 |
NULL) <= 0) |
1205 |
goto out; |
1206 |
pos += PAGE_SIZE - offset; |
1207 |
#else |
1208 |
page = bprm->page[i]; |
1209 |
#endif |
1210 |
/* Map. */ |
1211 |
kaddr = kmap(page); |
1212 |
if (!kaddr) { /* Mapping failed. */ |
1213 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
1214 |
put_page(page); |
1215 |
#endif |
1216 |
goto out; |
1217 |
} |
1218 |
/* Read. */ |
1219 |
while (argv_count && offset < PAGE_SIZE) { |
1220 |
if (!kaddr[offset++]) |
1221 |
argv_count--; |
1222 |
} |
1223 |
if (argv_count) |
1224 |
goto unmap_page; |
1225 |
while (offset < PAGE_SIZE) { |
1226 |
const unsigned char c = kaddr[offset++]; |
1227 |
if (c && arg_len < CCS_MAX_PATHNAME_LEN - 10) { |
1228 |
if (c == '=') { |
1229 |
arg_ptr[arg_len++] = '\0'; |
1230 |
} else if (c == '\\') { |
1231 |
arg_ptr[arg_len++] = '\\'; |
1232 |
arg_ptr[arg_len++] = '\\'; |
1233 |
} else if (c > ' ' && c < 127) { |
1234 |
arg_ptr[arg_len++] = c; |
1235 |
} else { |
1236 |
arg_ptr[arg_len++] = '\\'; |
1237 |
arg_ptr[arg_len++] = (c >> 6) + '0'; |
1238 |
arg_ptr[arg_len++] |
1239 |
= ((c >> 3) & 7) + '0'; |
1240 |
arg_ptr[arg_len++] = (c & 7) + '0'; |
1241 |
} |
1242 |
} else { |
1243 |
arg_ptr[arg_len] = '\0'; |
1244 |
} |
1245 |
if (c) |
1246 |
continue; |
1247 |
if (ccs_check_env_perm(r, arg_ptr)) { |
1248 |
error = -EPERM; |
1249 |
break; |
1250 |
} |
1251 |
if (!--envp_count) { |
1252 |
error = 0; |
1253 |
break; |
1254 |
} |
1255 |
arg_len = 0; |
1256 |
} |
1257 |
unmap_page: |
1258 |
/* Unmap. */ |
1259 |
kunmap(page); |
1260 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) && defined(CONFIG_MMU) |
1261 |
put_page(page); |
1262 |
#endif |
1263 |
i++; |
1264 |
offset = 0; |
1265 |
} |
1266 |
out: |
1267 |
if (r->mode != 3) |
1268 |
error = 0; |
1269 |
return error; |
1270 |
} |
1271 |
|
1272 |
/** |
1273 |
* unescape - Unescape escaped string. |
1274 |
* |
1275 |
* @dest: String to unescape. |
1276 |
* |
1277 |
* Returns nothing. |
1278 |
*/ |
1279 |
static void unescape(unsigned char *dest) |
1280 |
{ |
1281 |
unsigned char *src = dest; |
1282 |
unsigned char c; |
1283 |
unsigned char d; |
1284 |
unsigned char e; |
1285 |
while ((c = *src++) != '\0') { |
1286 |
if (c != '\\') { |
1287 |
*dest++ = c; |
1288 |
continue; |
1289 |
} |
1290 |
c = *src++; |
1291 |
if (c == '\\') { |
1292 |
*dest++ = c; |
1293 |
continue; |
1294 |
} |
1295 |
if (c < '0' || c > '3') |
1296 |
break; |
1297 |
d = *src++; |
1298 |
if (d < '0' || d > '7') |
1299 |
break; |
1300 |
e = *src++; |
1301 |
if (e < '0' || e > '7') |
1302 |
break; |
1303 |
*dest++ = ((c - '0') << 6) + ((d - '0') << 3) + (e - '0'); |
1304 |
} |
1305 |
*dest = '\0'; |
1306 |
} |
1307 |
|
1308 |
/** |
1309 |
* root_depth - Get number of directories to strip. |
1310 |
* |
1311 |
* @dentry: Pointer to "struct dentry". |
1312 |
* @vfsmnt: Pointer to "struct vfsmount". |
1313 |
* |
1314 |
* Returns number of directories to strip. |
1315 |
*/ |
1316 |
static inline int root_depth(struct dentry *dentry, struct vfsmount *vfsmnt) |
1317 |
{ |
1318 |
int depth = 0; |
1319 |
/***** CRITICAL SECTION START *****/ |
1320 |
ccs_realpath_lock(); |
1321 |
for (;;) { |
1322 |
if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) { |
1323 |
/* Global root? */ |
1324 |
if (vfsmnt->mnt_parent == vfsmnt) |
1325 |
break; |
1326 |
dentry = vfsmnt->mnt_mountpoint; |
1327 |
vfsmnt = vfsmnt->mnt_parent; |
1328 |
continue; |
1329 |
} |
1330 |
dentry = dentry->d_parent; |
1331 |
depth++; |
1332 |
} |
1333 |
ccs_realpath_unlock(); |
1334 |
/***** CRITICAL SECTION END *****/ |
1335 |
return depth; |
1336 |
} |
1337 |
|
1338 |
/** |
1339 |
* get_root_depth - return the depth of root directory. |
1340 |
* |
1341 |
* Returns number of directories to strip. |
1342 |
*/ |
1343 |
static int get_root_depth(void) |
1344 |
{ |
1345 |
int depth; |
1346 |
struct dentry *dentry; |
1347 |
struct vfsmount *vfsmnt; |
1348 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
1349 |
struct path root; |
1350 |
#endif |
1351 |
/***** CRITICAL SECTION START *****/ |
1352 |
read_lock(¤t->fs->lock); |
1353 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
1354 |
root = current->fs->root; |
1355 |
path_get(¤t->fs->root); |
1356 |
dentry = root.dentry; |
1357 |
vfsmnt = root.mnt; |
1358 |
#else |
1359 |
dentry = dget(current->fs->root); |
1360 |
vfsmnt = mntget(current->fs->rootmnt); |
1361 |
#endif |
1362 |
read_unlock(¤t->fs->lock); |
1363 |
/***** CRITICAL SECTION END *****/ |
1364 |
depth = root_depth(dentry, vfsmnt); |
1365 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
1366 |
path_put(&root); |
1367 |
#else |
1368 |
dput(dentry); |
1369 |
mntput(vfsmnt); |
1370 |
#endif |
1371 |
return depth; |
1372 |
} |
1373 |
|
1374 |
/** |
1375 |
* try_alt_exec - Try to start execute handler. |
1376 |
* |
1377 |
* @r: Pointer to "struct ccs_request_info". |
1378 |
* @handler: Pointer to the name of execute handler. |
1379 |
* @eh_path: Pointer to pointer to the name of execute handler. |
1380 |
* |
1381 |
* Returns 0 on success, negative value otherwise. |
1382 |
*/ |
1383 |
static int try_alt_exec(struct ccs_request_info *r, |
1384 |
const struct path_info *handler, char **eh_path) |
1385 |
{ |
1386 |
/* |
1387 |
* Contents of modified bprm. |
1388 |
* The envp[] in original bprm is moved to argv[] so that |
1389 |
* the alternatively executed program won't be affected by |
1390 |
* some dangerous environment variables like LD_PRELOAD. |
1391 |
* |
1392 |
* modified bprm->argc |
1393 |
* = original bprm->argc + original bprm->envc + 7 |
1394 |
* modified bprm->envc |
1395 |
* = 0 |
1396 |
* |
1397 |
* modified bprm->argv[0] |
1398 |
* = the program's name specified by execute_handler |
1399 |
* modified bprm->argv[1] |
1400 |
* = current->domain_info->domainname->name |
1401 |
* modified bprm->argv[2] |
1402 |
* = the current process's name |
1403 |
* modified bprm->argv[3] |
1404 |
* = the current process's information (e.g. uid/gid). |
1405 |
* modified bprm->argv[4] |
1406 |
* = original bprm->filename |
1407 |
* modified bprm->argv[5] |
1408 |
* = original bprm->argc in string expression |
1409 |
* modified bprm->argv[6] |
1410 |
* = original bprm->envc in string expression |
1411 |
* modified bprm->argv[7] |
1412 |
* = original bprm->argv[0] |
1413 |
* ... |
1414 |
* modified bprm->argv[bprm->argc + 6] |
1415 |
* = original bprm->argv[bprm->argc - 1] |
1416 |
* modified bprm->argv[bprm->argc + 7] |
1417 |
* = original bprm->envp[0] |
1418 |
* ... |
1419 |
* modified bprm->argv[bprm->envc + bprm->argc + 6] |
1420 |
* = original bprm->envp[bprm->envc - 1] |
1421 |
*/ |
1422 |
struct linux_binprm *bprm = r->bprm; |
1423 |
struct file *filp; |
1424 |
int retval; |
1425 |
const int original_argc = bprm->argc; |
1426 |
const int original_envc = bprm->envc; |
1427 |
struct task_struct *task = current; |
1428 |
char *buffer = r->obj->tmp->buffer; |
1429 |
/* Allocate memory for execute handler's pathname. */ |
1430 |
char *execute_handler = ccs_alloc(sizeof(struct ccs_page_buffer)); |
1431 |
*eh_path = execute_handler; |
1432 |
if (!execute_handler) |
1433 |
return -ENOMEM; |
1434 |
strncpy(execute_handler, handler->name, |
1435 |
sizeof(struct ccs_page_buffer) - 1); |
1436 |
unescape(execute_handler); |
1437 |
|
1438 |
/* Close the requested program's dentry. */ |
1439 |
allow_write_access(bprm->file); |
1440 |
fput(bprm->file); |
1441 |
bprm->file = NULL; |
1442 |
|
1443 |
{ /* Adjust root directory for open_exec(). */ |
1444 |
int depth = get_root_depth(); |
1445 |
char *cp = execute_handler; |
1446 |
if (!*cp || *cp != '/') |
1447 |
return -ENOENT; |
1448 |
while (depth) { |
1449 |
cp = strchr(cp + 1, '/'); |
1450 |
if (!cp) |
1451 |
return -ENOENT; |
1452 |
depth--; |
1453 |
} |
1454 |
memmove(execute_handler, cp, strlen(cp) + 1); |
1455 |
} |
1456 |
|
1457 |
/* Move envp[] to argv[] */ |
1458 |
bprm->argc += bprm->envc; |
1459 |
bprm->envc = 0; |
1460 |
|
1461 |
/* Set argv[6] */ |
1462 |
{ |
1463 |
snprintf(buffer, sizeof(struct ccs_page_buffer) - 1, "%d", |
1464 |
original_envc); |
1465 |
retval = copy_strings_kernel(1, &buffer, bprm); |
1466 |
if (retval < 0) |
1467 |
goto out; |
1468 |
bprm->argc++; |
1469 |
} |
1470 |
|
1471 |
/* Set argv[5] */ |
1472 |
{ |
1473 |
snprintf(buffer, sizeof(struct ccs_page_buffer) - 1, "%d", |
1474 |
original_argc); |
1475 |
retval = copy_strings_kernel(1, &buffer, bprm); |
1476 |
if (retval < 0) |
1477 |
goto out; |
1478 |
bprm->argc++; |
1479 |
} |
1480 |
|
1481 |
/* Set argv[4] */ |
1482 |
{ |
1483 |
retval = copy_strings_kernel(1, &bprm->filename, bprm); |
1484 |
if (retval < 0) |
1485 |
goto out; |
1486 |
bprm->argc++; |
1487 |
} |
1488 |
|
1489 |
/* Set argv[3] */ |
1490 |
{ |
1491 |
const u32 tomoyo_flags = task->tomoyo_flags; |
1492 |
snprintf(buffer, sizeof(struct ccs_page_buffer) - 1, |
1493 |
"pid=%d uid=%d gid=%d euid=%d egid=%d suid=%d " |
1494 |
"sgid=%d fsuid=%d fsgid=%d state[0]=%u " |
1495 |
"state[1]=%u state[2]=%u", |
1496 |
task->pid, task->uid, task->gid, task->euid, |
1497 |
task->egid, task->suid, task->sgid, task->fsuid, |
1498 |
task->fsgid, (u8) (tomoyo_flags >> 24), |
1499 |
(u8) (tomoyo_flags >> 16), (u8) (tomoyo_flags >> 8)); |
1500 |
retval = copy_strings_kernel(1, &buffer, bprm); |
1501 |
if (retval < 0) |
1502 |
goto out; |
1503 |
bprm->argc++; |
1504 |
} |
1505 |
|
1506 |
/* Set argv[2] */ |
1507 |
{ |
1508 |
char *exe = (char *) ccs_get_exe(); |
1509 |
if (exe) { |
1510 |
retval = copy_strings_kernel(1, &exe, bprm); |
1511 |
ccs_free(exe); |
1512 |
} else { |
1513 |
snprintf(buffer, sizeof(struct ccs_page_buffer) - 1, |
1514 |
"<unknown>"); |
1515 |
retval = copy_strings_kernel(1, &buffer, bprm); |
1516 |
} |
1517 |
if (retval < 0) |
1518 |
goto out; |
1519 |
bprm->argc++; |
1520 |
} |
1521 |
|
1522 |
/* Set argv[1] */ |
1523 |
{ |
1524 |
strncpy(buffer, task->domain_info->domainname->name, |
1525 |
sizeof(struct ccs_page_buffer) - 1); |
1526 |
retval = copy_strings_kernel(1, &buffer, bprm); |
1527 |
if (retval < 0) |
1528 |
goto out; |
1529 |
bprm->argc++; |
1530 |
} |
1531 |
|
1532 |
/* Set argv[0] */ |
1533 |
{ |
1534 |
retval = copy_strings_kernel(1, &execute_handler, bprm); |
1535 |
if (retval < 0) |
1536 |
goto out; |
1537 |
bprm->argc++; |
1538 |
} |
1539 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) |
1540 |
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 24) |
1541 |
bprm->argv_len = bprm->exec - bprm->p; |
1542 |
#endif |
1543 |
#endif |
1544 |
|
1545 |
/* OK, now restart the process with execute handler program's dentry. */ |
1546 |
filp = open_exec(execute_handler); |
1547 |
if (IS_ERR(filp)) { |
1548 |
retval = PTR_ERR(filp); |
1549 |
goto out; |
1550 |
} |
1551 |
bprm->file = filp; |
1552 |
bprm->filename = execute_handler; |
1553 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
1554 |
bprm->interp = execute_handler; |
1555 |
#endif |
1556 |
retval = prepare_binprm(bprm); |
1557 |
if (retval < 0) |
1558 |
goto out; |
1559 |
task->tomoyo_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
1560 |
retval = find_next_domain(r, handler); |
1561 |
task->tomoyo_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
1562 |
out: |
1563 |
return retval; |
1564 |
} |
1565 |
|
1566 |
/** |
1567 |
* find_execute_handler - Find an execute handler. |
1568 |
* |
1569 |
* @type: Type of execute handler. |
1570 |
* |
1571 |
* Returns pointer to "struct path_info" if found, NULL otherwise. |
1572 |
*/ |
1573 |
static const struct path_info *find_execute_handler(const u8 type) |
1574 |
{ |
1575 |
struct task_struct *task = current; |
1576 |
const struct domain_info *domain = task->domain_info; |
1577 |
struct acl_info *ptr; |
1578 |
/* |
1579 |
* Don't use execute handler if the current process is |
1580 |
* marked as execute handler to avoid infinite execute handler loop. |
1581 |
*/ |
1582 |
if (task->tomoyo_flags & TOMOYO_TASK_IS_EXECUTE_HANDLER) |
1583 |
return NULL; |
1584 |
list1_for_each_entry(ptr, &domain->acl_info_list, list) { |
1585 |
struct execute_handler_record *acl; |
1586 |
if (ptr->type != type) |
1587 |
continue; |
1588 |
acl = container_of(ptr, struct execute_handler_record, head); |
1589 |
return acl->handler; |
1590 |
} |
1591 |
return NULL; |
1592 |
} |
1593 |
|
1594 |
/* List of next_domain which is used for checking interpreter's permissions. */ |
1595 |
struct execve_entry { |
1596 |
struct list_head list; |
1597 |
struct task_struct *task; |
1598 |
struct domain_info *next_domain; |
1599 |
}; |
1600 |
|
1601 |
static LIST_HEAD(execve_list); |
1602 |
static DEFINE_SPINLOCK(execve_list_lock); |
1603 |
|
1604 |
/** |
1605 |
* ccs_register_next_domain - Remember next_domain. |
1606 |
* |
1607 |
* @next_domain: Pointer to "struct domain_info". |
1608 |
* |
1609 |
* Returns 0 on success, -ENOMEM otherwise. |
1610 |
*/ |
1611 |
static int ccs_register_next_domain(struct domain_info *next_domain) |
1612 |
{ |
1613 |
struct execve_entry *ee = kmalloc(sizeof(*ee), GFP_KERNEL); |
1614 |
if (!ee) |
1615 |
return -ENOMEM; |
1616 |
ee->task = current; |
1617 |
ee->next_domain = next_domain; |
1618 |
/***** CRITICAL SECTION START *****/ |
1619 |
spin_lock(&execve_list_lock); |
1620 |
list_add(&ee->list, &execve_list); |
1621 |
spin_unlock(&execve_list_lock); |
1622 |
/***** CRITICAL SECTION END *****/ |
1623 |
return 0; |
1624 |
} |
1625 |
|
1626 |
/** |
1627 |
* ccs_fetch_next_domain - Fetch next_domain from the list. |
1628 |
* |
1629 |
* Returns pointer to "struct domain_info" which will be used if execve() |
1630 |
* succeeds. This function does not return NULL. |
1631 |
*/ |
1632 |
struct domain_info *ccs_fetch_next_domain(void) |
1633 |
{ |
1634 |
struct task_struct *task = current; |
1635 |
struct domain_info *next_domain = task->domain_info; |
1636 |
struct execve_entry *p; |
1637 |
/***** CRITICAL SECTION START *****/ |
1638 |
spin_lock(&execve_list_lock); |
1639 |
list_for_each_entry(p, &execve_list, list) { |
1640 |
if (p->task != task) |
1641 |
continue; |
1642 |
next_domain = p->next_domain; |
1643 |
break; |
1644 |
} |
1645 |
spin_unlock(&execve_list_lock); |
1646 |
/***** CRITICAL SECTION END *****/ |
1647 |
return next_domain; |
1648 |
} |
1649 |
|
1650 |
/** |
1651 |
* ccs_unregister_next_domain - Forget next_domain. |
1652 |
*/ |
1653 |
static void ccs_unregister_next_domain(void) |
1654 |
{ |
1655 |
struct task_struct *task = current; |
1656 |
struct execve_entry *p; |
1657 |
struct execve_entry *ee = NULL; |
1658 |
/***** CRITICAL SECTION START *****/ |
1659 |
spin_lock(&execve_list_lock); |
1660 |
list_for_each_entry(p, &execve_list, list) { |
1661 |
if (p->task != task) |
1662 |
continue; |
1663 |
list_del(&p->list); |
1664 |
ee = p; |
1665 |
break; |
1666 |
} |
1667 |
spin_unlock(&execve_list_lock); |
1668 |
/***** CRITICAL SECTION END *****/ |
1669 |
kfree(ee); |
1670 |
} |
1671 |
|
1672 |
/** |
1673 |
* search_binary_handler_with_transition - Perform domain transition. |
1674 |
* |
1675 |
* @bprm: Pointer to "struct linux_binprm". |
1676 |
* @regs: Pointer to "struct pt_regs". |
1677 |
* |
1678 |
* Returns result of search_binary_handler() on success, |
1679 |
* negative value otherwise. |
1680 |
*/ |
1681 |
int search_binary_handler_with_transition(struct linux_binprm *bprm, |
1682 |
struct pt_regs *regs) |
1683 |
{ |
1684 |
int retval; |
1685 |
struct task_struct *task = current; |
1686 |
const struct path_info *handler; |
1687 |
struct ccs_request_info r; |
1688 |
struct obj_info obj; |
1689 |
/* |
1690 |
* "eh_path" holds path to execute handler program. |
1691 |
* Thus, keep valid until search_binary_handler() finishes. |
1692 |
*/ |
1693 |
char *eh_path = NULL; |
1694 |
struct ccs_page_buffer *tmp = ccs_alloc(sizeof(struct ccs_page_buffer)); |
1695 |
memset(&obj, 0, sizeof(obj)); |
1696 |
if (!sbin_init_started) |
1697 |
ccs_load_policy(bprm->filename); |
1698 |
if (!tmp) |
1699 |
return -ENOMEM; |
1700 |
|
1701 |
ccs_init_request_info(&r, NULL, CCS_TOMOYO_MAC_FOR_FILE); |
1702 |
r.bprm = bprm; |
1703 |
r.obj = &obj; |
1704 |
obj.path1_dentry = bprm->file->f_dentry; |
1705 |
obj.path1_vfsmnt = bprm->file->f_vfsmnt; |
1706 |
obj.tmp = tmp; |
1707 |
|
1708 |
/* Clear manager flag. */ |
1709 |
task->tomoyo_flags &= ~CCS_TASK_IS_POLICY_MANAGER; |
1710 |
handler = find_execute_handler(TYPE_EXECUTE_HANDLER); |
1711 |
if (handler) { |
1712 |
retval = try_alt_exec(&r, handler, &eh_path); |
1713 |
if (!retval) |
1714 |
audit_execute_handler_log(true, handler->name, bprm); |
1715 |
goto ok; |
1716 |
} |
1717 |
retval = find_next_domain(&r, NULL); |
1718 |
if (retval != -EPERM) |
1719 |
goto ok; |
1720 |
handler = find_execute_handler(TYPE_DENIED_EXECUTE_HANDLER); |
1721 |
if (handler) { |
1722 |
retval = try_alt_exec(&r, handler, &eh_path); |
1723 |
if (!retval) |
1724 |
audit_execute_handler_log(false, handler->name, bprm); |
1725 |
} |
1726 |
ok: |
1727 |
if (retval < 0) |
1728 |
goto out; |
1729 |
r.mode = ccs_check_flags(r.domain, CCS_TOMOYO_MAC_FOR_ENV); |
1730 |
retval = check_environ(&r); |
1731 |
if (retval < 0) |
1732 |
goto out; |
1733 |
retval = ccs_register_next_domain(r.domain); |
1734 |
if (retval < 0) |
1735 |
goto out; |
1736 |
task->tomoyo_flags |= TOMOYO_CHECK_READ_FOR_OPEN_EXEC; |
1737 |
retval = search_binary_handler(bprm, regs); |
1738 |
task->tomoyo_flags &= ~TOMOYO_CHECK_READ_FOR_OPEN_EXEC; |
1739 |
if (retval < 0) |
1740 |
goto out; |
1741 |
/* Proceed to next domain if execution suceeded. */ |
1742 |
task->domain_info = r.domain; |
1743 |
mb(); /* Make domain transition visible to other CPUs. */ |
1744 |
/* Mark the current process as execute handler. */ |
1745 |
if (handler) |
1746 |
task->tomoyo_flags |= TOMOYO_TASK_IS_EXECUTE_HANDLER; |
1747 |
/* Mark the current process as normal process. */ |
1748 |
else |
1749 |
task->tomoyo_flags &= ~TOMOYO_TASK_IS_EXECUTE_HANDLER; |
1750 |
out: |
1751 |
ccs_unregister_next_domain(); |
1752 |
ccs_free(eh_path); |
1753 |
ccs_free(tmp); |
1754 |
return retval; |
1755 |
} |
1756 |
|
1757 |
#else |
1758 |
|
1759 |
/** |
1760 |
* search_binary_handler_with_transition - Wrapper for search_binary_handler(). |
1761 |
* |
1762 |
* @bprm: Pointer to "struct linux_binprm". |
1763 |
* @regs: Pointer to "struct pt_regs". |
1764 |
* |
1765 |
* Returns the result of search_binary_handler(). |
1766 |
*/ |
1767 |
int search_binary_handler_with_transition(struct linux_binprm *bprm, |
1768 |
struct pt_regs *regs) |
1769 |
{ |
1770 |
#ifdef CONFIG_SAKURA |
1771 |
/* Clear manager flag. */ |
1772 |
current->tomoyo_flags &= ~CCS_TASK_IS_POLICY_MANAGER; |
1773 |
ccs_load_policy(bprm->filename); |
1774 |
#endif |
1775 |
return search_binary_handler(bprm, regs); |
1776 |
} |
1777 |
|
1778 |
#endif |