?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
TOMOYO: Remove memory pool for list elements.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / security / tomoyo / common.c
blobe331e699cf54edbde26decbc2e65c15a9b3bba3f
1 /*
2 * security/tomoyo/common.c
3 *
4 * Common functions for TOMOYO.
5 *
6 * Copyright (C) 2005-2009 NTT DATA CORPORATION
7 *
8 * Version: 2.2.0 2009/04/01
9 *
10 */
11
12 #include <linux/uaccess.h>
13 #include <linux/security.h>
14 #include <linux/hardirq.h>
15 #include "realpath.h"
16 #include "common.h"
17 #include "tomoyo.h"
18
19 /* Lock for protecting policy. */
20 DEFINE_MUTEX(tomoyo_policy_lock);
21
22 /* Has loading policy done? */
23 bool tomoyo_policy_loaded;
24
25 /* String table for functionality that takes 4 modes. */
26 static const char *tomoyo_mode_4[4] = {
27 "disabled", "learning", "permissive", "enforcing"
28 };
29 /* String table for functionality that takes 2 modes. */
30 static const char *tomoyo_mode_2[4] = {
31 "disabled", "enabled", "enabled", "enabled"
32 };
33
34 /*
35 * tomoyo_control_array is a static data which contains
36 *
37 * (1) functionality name used by /sys/kernel/security/tomoyo/profile .
38 * (2) initial values for "struct tomoyo_profile".
39 * (3) max values for "struct tomoyo_profile".
40 */
41 static struct {
42 const char *keyword;
43 unsigned int current_value;
44 const unsigned int max_value;
45 } tomoyo_control_array[TOMOYO_MAX_CONTROL_INDEX] = {
46 [TOMOYO_MAC_FOR_FILE] = { "MAC_FOR_FILE", 0, 3 },
47 [TOMOYO_MAX_ACCEPT_ENTRY] = { "MAX_ACCEPT_ENTRY", 2048, INT_MAX },
48 [TOMOYO_VERBOSE] = { "TOMOYO_VERBOSE", 1, 1 },
49 };
50
51 /*
52 * tomoyo_profile is a structure which is used for holding the mode of access
53 * controls. TOMOYO has 4 modes: disabled, learning, permissive, enforcing.
54 * An administrator can define up to 256 profiles.
55 * The ->profile of "struct tomoyo_domain_info" is used for remembering
56 * the profile's number (0 - 255) assigned to that domain.
57 */
58 static struct tomoyo_profile {
59 unsigned int value[TOMOYO_MAX_CONTROL_INDEX];
60 const struct tomoyo_path_info *comment;
61 } *tomoyo_profile_ptr[TOMOYO_MAX_PROFILES];
62
63 /* Permit policy management by non-root user? */
64 static bool tomoyo_manage_by_non_root;
65
66 /* Utility functions. */
67
68 /* Open operation for /sys/kernel/security/tomoyo/ interface. */
69 static int tomoyo_open_control(const u8 type, struct file *file);
70 /* Close /sys/kernel/security/tomoyo/ interface. */
71 static int tomoyo_close_control(struct file *file);
72 /* Read operation for /sys/kernel/security/tomoyo/ interface. */
73 static int tomoyo_read_control(struct file *file, char __user *buffer,
74 const int buffer_len);
75 /* Write operation for /sys/kernel/security/tomoyo/ interface. */
76 static int tomoyo_write_control(struct file *file, const char __user *buffer,
77 const int buffer_len);
78
79 /**
80 * tomoyo_is_byte_range - Check whether the string isa \ooo style octal value.
81 *
82 * @str: Pointer to the string.
83 *
84 * Returns true if @str is a \ooo style octal value, false otherwise.
85 *
86 * TOMOYO uses \ooo style representation for 0x01 - 0x20 and 0x7F - 0xFF.
87 * This function verifies that \ooo is in valid range.
88 */
89 static inline bool tomoyo_is_byte_range(const char *str)
90 {
91 return *str >= '0' && *str++ <= '3' &&
92 *str >= '0' && *str++ <= '7' &&
93 *str >= '0' && *str <= '7';
94 }
95
96 /**
97 * tomoyo_is_alphabet_char - Check whether the character is an alphabet.
98 *
99 * @c: The character to check.
100 *
101 * Returns true if @c is an alphabet character, false otherwise.
102 */
103 static inline bool tomoyo_is_alphabet_char(const char c)
104 {
105 return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z');
106 }
107
108 /**
109 * tomoyo_make_byte - Make byte value from three octal characters.
110 *
111 * @c1: The first character.
112 * @c2: The second character.
113 * @c3: The third character.
114 *
115 * Returns byte value.
116 */
117 static inline u8 tomoyo_make_byte(const u8 c1, const u8 c2, const u8 c3)
118 {
119 return ((c1 - '0') << 6) + ((c2 - '0') << 3) + (c3 - '0');
120 }
121
122 /**
123 * tomoyo_str_starts - Check whether the given string starts with the given keyword.
124 *
125 * @src: Pointer to pointer to the string.
126 * @find: Pointer to the keyword.
127 *
128 * Returns true if @src starts with @find, false otherwise.
129 *
130 * The @src is updated to point the first character after the @find
131 * if @src starts with @find.
132 */
133 static bool tomoyo_str_starts(char **src, const char *find)
134 {
135 const int len = strlen(find);
136 char *tmp = *src;
137
138 if (strncmp(tmp, find, len))
139 return false;
140 tmp += len;
141 *src = tmp;
142 return true;
143 }
144
145 /**
146 * tomoyo_normalize_line - Format string.
147 *
148 * @buffer: The line to normalize.
149 *
150 * Leading and trailing whitespaces are removed.
151 * Multiple whitespaces are packed into single space.
152 *
153 * Returns nothing.
154 */
155 static void tomoyo_normalize_line(unsigned char *buffer)
156 {
157 unsigned char *sp = buffer;
158 unsigned char *dp = buffer;
159 bool first = true;
160
161 while (tomoyo_is_invalid(*sp))
162 sp++;
163 while (*sp) {
164 if (!first)
165 *dp++ = ' ';
166 first = false;
167 while (tomoyo_is_valid(*sp))
168 *dp++ = *sp++;
169 while (tomoyo_is_invalid(*sp))
170 sp++;
171 }
172 *dp = '\0';
173 }
174
175 /**
176 * tomoyo_is_correct_path - Validate a pathname.
177 * @filename: The pathname to check.
178 * @start_type: Should the pathname start with '/'?
179 * 1 = must / -1 = must not / 0 = don't care
180 * @pattern_type: Can the pathname contain a wildcard?
181 * 1 = must / -1 = must not / 0 = don't care
182 * @end_type: Should the pathname end with '/'?
183 * 1 = must / -1 = must not / 0 = don't care
184 * @function: The name of function calling me.
185 *
186 * Check whether the given filename follows the naming rules.
187 * Returns true if @filename follows the naming rules, false otherwise.
188 */
189 bool tomoyo_is_correct_path(const char *filename, const s8 start_type,
190 const s8 pattern_type, const s8 end_type,
191 const char *function)
192 {
193 const char *const start = filename;
194 bool in_repetition = false;
195 bool contains_pattern = false;
196 unsigned char c;
197 unsigned char d;
198 unsigned char e;
199 const char *original_filename = filename;
200
201 if (!filename)
202 goto out;
203 c = *filename;
204 if (start_type == 1) { /* Must start with '/' */
205 if (c != '/')
206 goto out;
207 } else if (start_type == -1) { /* Must not start with '/' */
208 if (c == '/')
209 goto out;
210 }
211 if (c)
212 c = *(filename + strlen(filename) - 1);
213 if (end_type == 1) { /* Must end with '/' */
214 if (c != '/')
215 goto out;
216 } else if (end_type == -1) { /* Must not end with '/' */
217 if (c == '/')
218 goto out;
219 }
220 while (1) {
221 c = *filename++;
222 if (!c)
223 break;
224 if (c == '\\') {
225 c = *filename++;
226 switch (c) {
227 case '\\': /* "\\" */
228 continue;
229 case '$': /* "\$" */
230 case '+': /* "\+" */
231 case '?': /* "\?" */
232 case '*': /* "\*" */
233 case '@': /* "\@" */
234 case 'x': /* "\x" */
235 case 'X': /* "\X" */
236 case 'a': /* "\a" */
237 case 'A': /* "\A" */
238 case '-': /* "\-" */
239 if (pattern_type == -1)
240 break; /* Must not contain pattern */
241 contains_pattern = true;
242 continue;
243 case '{': /* "/\{" */
244 if (filename - 3 < start ||
245 *(filename - 3) != '/')
246 break;
247 if (pattern_type == -1)
248 break; /* Must not contain pattern */
249 contains_pattern = true;
250 in_repetition = true;
251 continue;
252 case '}': /* "\}/" */
253 if (*filename != '/')
254 break;
255 if (!in_repetition)
256 break;
257 in_repetition = false;
258 continue;
259 case '0': /* "\ooo" */
260 case '1':
261 case '2':
262 case '3':
263 d = *filename++;
264 if (d < '0' || d > '7')
265 break;
266 e = *filename++;
267 if (e < '0' || e > '7')
268 break;
269 c = tomoyo_make_byte(c, d, e);
270 if (tomoyo_is_invalid(c))
271 continue; /* pattern is not \000 */
272 }
273 goto out;
274 } else if (in_repetition && c == '/') {
275 goto out;
276 } else if (tomoyo_is_invalid(c)) {
277 goto out;
278 }
279 }
280 if (pattern_type == 1) { /* Must contain pattern */
281 if (!contains_pattern)
282 goto out;
283 }
284 if (in_repetition)
285 goto out;
286 return true;
287 out:
288 printk(KERN_DEBUG "%s: Invalid pathname '%s'\n", function,
289 original_filename);
290 return false;
291 }
292
293 /**
294 * tomoyo_is_correct_domain - Check whether the given domainname follows the naming rules.
295 * @domainname: The domainname to check.
296 * @function: The name of function calling me.
297 *
298 * Returns true if @domainname follows the naming rules, false otherwise.
299 */
300 bool tomoyo_is_correct_domain(const unsigned char *domainname,
301 const char *function)
302 {
303 unsigned char c;
304 unsigned char d;
305 unsigned char e;
306 const char *org_domainname = domainname;
307
308 if (!domainname || strncmp(domainname, TOMOYO_ROOT_NAME,
309 TOMOYO_ROOT_NAME_LEN))
310 goto out;
311 domainname += TOMOYO_ROOT_NAME_LEN;
312 if (!*domainname)
313 return true;
314 do {
315 if (*domainname++ != ' ')
316 goto out;
317 if (*domainname++ != '/')
318 goto out;
319 while ((c = *domainname) != '\0' && c != ' ') {
320 domainname++;
321 if (c == '\\') {
322 c = *domainname++;
323 switch ((c)) {
324 case '\\': /* "\\" */
325 continue;
326 case '0': /* "\ooo" */
327 case '1':
328 case '2':
329 case '3':
330 d = *domainname++;
331 if (d < '0' || d > '7')
332 break;
333 e = *domainname++;
334 if (e < '0' || e > '7')
335 break;
336 c = tomoyo_make_byte(c, d, e);
337 if (tomoyo_is_invalid(c))
338 /* pattern is not \000 */
339 continue;
340 }
341 goto out;
342 } else if (tomoyo_is_invalid(c)) {
343 goto out;
344 }
345 }
346 } while (*domainname);
347 return true;
348 out:
349 printk(KERN_DEBUG "%s: Invalid domainname '%s'\n", function,
350 org_domainname);
351 return false;
352 }
353
354 /**
355 * tomoyo_is_domain_def - Check whether the given token can be a domainname.
356 *
357 * @buffer: The token to check.
358 *
359 * Returns true if @buffer possibly be a domainname, false otherwise.
360 */
361 bool tomoyo_is_domain_def(const unsigned char *buffer)
362 {
363 return !strncmp(buffer, TOMOYO_ROOT_NAME, TOMOYO_ROOT_NAME_LEN);
364 }
365
366 /**
367 * tomoyo_find_domain - Find a domain by the given name.
368 *
369 * @domainname: The domainname to find.
370 *
371 * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
372 *
373 * Caller holds tomoyo_read_lock().
374 */
375 struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname)
376 {
377 struct tomoyo_domain_info *domain;
378 struct tomoyo_path_info name;
379
380 name.name = domainname;
381 tomoyo_fill_path_info(&name);
382 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
383 if (!domain->is_deleted &&
384 !tomoyo_pathcmp(&name, domain->domainname))
385 return domain;
386 }
387 return NULL;
388 }
389
390 /**
391 * tomoyo_const_part_length - Evaluate the initial length without a pattern in a token.
392 *
393 * @filename: The string to evaluate.
394 *
395 * Returns the initial length without a pattern in @filename.
396 */
397 static int tomoyo_const_part_length(const char *filename)
398 {
399 char c;
400 int len = 0;
401
402 if (!filename)
403 return 0;
404 while ((c = *filename++) != '\0') {
405 if (c != '\\') {
406 len++;
407 continue;
408 }
409 c = *filename++;
410 switch (c) {
411 case '\\': /* "\\" */
412 len += 2;
413 continue;
414 case '0': /* "\ooo" */
415 case '1':
416 case '2':
417 case '3':
418 c = *filename++;
419 if (c < '0' || c > '7')
420 break;
421 c = *filename++;
422 if (c < '0' || c > '7')
423 break;
424 len += 4;
425 continue;
426 }
427 break;
428 }
429 return len;
430 }
431
432 /**
433 * tomoyo_fill_path_info - Fill in "struct tomoyo_path_info" members.
434 *
435 * @ptr: Pointer to "struct tomoyo_path_info" to fill in.
436 *
437 * The caller sets "struct tomoyo_path_info"->name.
438 */
439 void tomoyo_fill_path_info(struct tomoyo_path_info *ptr)
440 {
441 const char *name = ptr->name;
442 const int len = strlen(name);
443
444 ptr->const_len = tomoyo_const_part_length(name);
445 ptr->is_dir = len && (name[len - 1] == '/');
446 ptr->is_patterned = (ptr->const_len < len);
447 ptr->hash = full_name_hash(name, len);
448 }
449
450 /**
451 * tomoyo_file_matches_pattern2 - Pattern matching without '/' character
452 * and "\-" pattern.
453 *
454 * @filename: The start of string to check.
455 * @filename_end: The end of string to check.
456 * @pattern: The start of pattern to compare.
457 * @pattern_end: The end of pattern to compare.
458 *
459 * Returns true if @filename matches @pattern, false otherwise.
460 */
461 static bool tomoyo_file_matches_pattern2(const char *filename,
462 const char *filename_end,
463 const char *pattern,
464 const char *pattern_end)
465 {
466 while (filename < filename_end && pattern < pattern_end) {
467 char c;
468 if (*pattern != '\\') {
469 if (*filename++ != *pattern++)
470 return false;
471 continue;
472 }
473 c = *filename;
474 pattern++;
475 switch (*pattern) {
476 int i;
477 int j;
478 case '?':
479 if (c == '/') {
480 return false;
481 } else if (c == '\\') {
482 if (filename[1] == '\\')
483 filename++;
484 else if (tomoyo_is_byte_range(filename + 1))
485 filename += 3;
486 else
487 return false;
488 }
489 break;
490 case '\\':
491 if (c != '\\')
492 return false;
493 if (*++filename != '\\')
494 return false;
495 break;
496 case '+':
497 if (!isdigit(c))
498 return false;
499 break;
500 case 'x':
501 if (!isxdigit(c))
502 return false;
503 break;
504 case 'a':
505 if (!tomoyo_is_alphabet_char(c))
506 return false;
507 break;
508 case '0':
509 case '1':
510 case '2':
511 case '3':
512 if (c == '\\' && tomoyo_is_byte_range(filename + 1)
513 && strncmp(filename + 1, pattern, 3) == 0) {
514 filename += 3;
515 pattern += 2;
516 break;
517 }
518 return false; /* Not matched. */
519 case '*':
520 case '@':
521 for (i = 0; i <= filename_end - filename; i++) {
522 if (tomoyo_file_matches_pattern2(
523 filename + i, filename_end,
524 pattern + 1, pattern_end))
525 return true;
526 c = filename[i];
527 if (c == '.' && *pattern == '@')
528 break;
529 if (c != '\\')
530 continue;
531 if (filename[i + 1] == '\\')
532 i++;
533 else if (tomoyo_is_byte_range(filename + i + 1))
534 i += 3;
535 else
536 break; /* Bad pattern. */
537 }
538 return false; /* Not matched. */
539 default:
540 j = 0;
541 c = *pattern;
542 if (c == '$') {
543 while (isdigit(filename[j]))
544 j++;
545 } else if (c == 'X') {
546 while (isxdigit(filename[j]))
547 j++;
548 } else if (c == 'A') {
549 while (tomoyo_is_alphabet_char(filename[j]))
550 j++;
551 }
552 for (i = 1; i <= j; i++) {
553 if (tomoyo_file_matches_pattern2(
554 filename + i, filename_end,
555 pattern + 1, pattern_end))
556 return true;
557 }
558 return false; /* Not matched or bad pattern. */
559 }
560 filename++;
561 pattern++;
562 }
563 while (*pattern == '\\' &&
564 (*(pattern + 1) == '*' || *(pattern + 1) == '@'))
565 pattern += 2;
566 return filename == filename_end && pattern == pattern_end;
567 }
568
569 /**
570 * tomoyo_file_matches_pattern - Pattern matching without without '/' character.
571 *
572 * @filename: The start of string to check.
573 * @filename_end: The end of string to check.
574 * @pattern: The start of pattern to compare.
575 * @pattern_end: The end of pattern to compare.
576 *
577 * Returns true if @filename matches @pattern, false otherwise.
578 */
579 static bool tomoyo_file_matches_pattern(const char *filename,
580 const char *filename_end,
581 const char *pattern,
582 const char *pattern_end)
583 {
584 const char *pattern_start = pattern;
585 bool first = true;
586 bool result;
587
588 while (pattern < pattern_end - 1) {
589 /* Split at "\-" pattern. */
590 if (*pattern++ != '\\' || *pattern++ != '-')
591 continue;
592 result = tomoyo_file_matches_pattern2(filename,
593 filename_end,
594 pattern_start,
595 pattern - 2);
596 if (first)
597 result = !result;
598 if (result)
599 return false;
600 first = false;
601 pattern_start = pattern;
602 }
603 result = tomoyo_file_matches_pattern2(filename, filename_end,
604 pattern_start, pattern_end);
605 return first ? result : !result;
606 }
607
608 /**
609 * tomoyo_path_matches_pattern2 - Do pathname pattern matching.
610 *
611 * @f: The start of string to check.
612 * @p: The start of pattern to compare.
613 *
614 * Returns true if @f matches @p, false otherwise.
615 */
616 static bool tomoyo_path_matches_pattern2(const char *f, const char *p)
617 {
618 const char *f_delimiter;
619 const char *p_delimiter;
620
621 while (*f && *p) {
622 f_delimiter = strchr(f, '/');
623 if (!f_delimiter)
624 f_delimiter = f + strlen(f);
625 p_delimiter = strchr(p, '/');
626 if (!p_delimiter)
627 p_delimiter = p + strlen(p);
628 if (*p == '\\' && *(p + 1) == '{')
629 goto recursive;
630 if (!tomoyo_file_matches_pattern(f, f_delimiter, p,
631 p_delimiter))
632 return false;
633 f = f_delimiter;
634 if (*f)
635 f++;
636 p = p_delimiter;
637 if (*p)
638 p++;
639 }
640 /* Ignore trailing "\*" and "\@" in @pattern. */
641 while (*p == '\\' &&
642 (*(p + 1) == '*' || *(p + 1) == '@'))
643 p += 2;
644 return !*f && !*p;
645 recursive:
646 /*
647 * The "\{" pattern is permitted only after '/' character.
648 * This guarantees that below "*(p - 1)" is safe.
649 * Also, the "\}" pattern is permitted only before '/' character
650 * so that "\{" + "\}" pair will not break the "\-" operator.
651 */
652 if (*(p - 1) != '/' || p_delimiter <= p + 3 || *p_delimiter != '/' ||
653 *(p_delimiter - 1) != '}' || *(p_delimiter - 2) != '\\')
654 return false; /* Bad pattern. */
655 do {
656 /* Compare current component with pattern. */
657 if (!tomoyo_file_matches_pattern(f, f_delimiter, p + 2,
658 p_delimiter - 2))
659 break;
660 /* Proceed to next component. */
661 f = f_delimiter;
662 if (!*f)
663 break;
664 f++;
665 /* Continue comparison. */
666 if (tomoyo_path_matches_pattern2(f, p_delimiter + 1))
667 return true;
668 f_delimiter = strchr(f, '/');
669 } while (f_delimiter);
670 return false; /* Not matched. */
671 }
672
673 /**
674 * tomoyo_path_matches_pattern - Check whether the given filename matches the given pattern.
675 *
676 * @filename: The filename to check.
677 * @pattern: The pattern to compare.
678 *
679 * Returns true if matches, false otherwise.
680 *
681 * The following patterns are available.
682 * \\ \ itself.
683 * \ooo Octal representation of a byte.
684 * \* Zero or more repetitions of characters other than '/'.
685 * \@ Zero or more repetitions of characters other than '/' or '.'.
686 * \? 1 byte character other than '/'.
687 * \$ One or more repetitions of decimal digits.
688 * \+ 1 decimal digit.
689 * \X One or more repetitions of hexadecimal digits.
690 * \x 1 hexadecimal digit.
691 * \A One or more repetitions of alphabet characters.
692 * \a 1 alphabet character.
693 *
694 * \- Subtraction operator.
695 *
696 * /\{dir\}/ '/' + 'One or more repetitions of dir/' (e.g. /dir/ /dir/dir/
697 * /dir/dir/dir/ ).
698 */
699 bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename,
700 const struct tomoyo_path_info *pattern)
701 {
702 const char *f = filename->name;
703 const char *p = pattern->name;
704 const int len = pattern->const_len;
705
706 /* If @pattern doesn't contain pattern, I can use strcmp(). */
707 if (!pattern->is_patterned)
708 return !tomoyo_pathcmp(filename, pattern);
709 /* Don't compare directory and non-directory. */
710 if (filename->is_dir != pattern->is_dir)
711 return false;
712 /* Compare the initial length without patterns. */
713 if (strncmp(f, p, len))
714 return false;
715 f += len;
716 p += len;
717 return tomoyo_path_matches_pattern2(f, p);
718 }
719
720 /**
721 * tomoyo_io_printf - Transactional printf() to "struct tomoyo_io_buffer" structure.
722 *
723 * @head: Pointer to "struct tomoyo_io_buffer".
724 * @fmt: The printf()'s format string, followed by parameters.
725 *
726 * Returns true if output was written, false otherwise.
727 *
728 * The snprintf() will truncate, but tomoyo_io_printf() won't.
729 */
730 bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
731 {
732 va_list args;
733 int len;
734 int pos = head->read_avail;
735 int size = head->readbuf_size - pos;
736
737 if (size <= 0)
738 return false;
739 va_start(args, fmt);
740 len = vsnprintf(head->read_buf + pos, size, fmt, args);
741 va_end(args);
742 if (pos + len >= head->readbuf_size)
743 return false;
744 head->read_avail += len;
745 return true;
746 }
747
748 /**
749 * tomoyo_get_exe - Get tomoyo_realpath() of current process.
750 *
751 * Returns the tomoyo_realpath() of current process on success, NULL otherwise.
752 *
753 * This function uses tomoyo_alloc(), so the caller must call tomoyo_free()
754 * if this function didn't return NULL.
755 */
756 static const char *tomoyo_get_exe(void)
757 {
758 struct mm_struct *mm = current->mm;
759 struct vm_area_struct *vma;
760 const char *cp = NULL;
761
762 if (!mm)
763 return NULL;
764 down_read(&mm->mmap_sem);
765 for (vma = mm->mmap; vma; vma = vma->vm_next) {
766 if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file) {
767 cp = tomoyo_realpath_from_path(&vma->vm_file->f_path);
768 break;
769 }
770 }
771 up_read(&mm->mmap_sem);
772 return cp;
773 }
774
775 /**
776 * tomoyo_get_msg - Get warning message.
777 *
778 * @is_enforce: Is it enforcing mode?
779 *
780 * Returns "ERROR" or "WARNING".
781 */
782 const char *tomoyo_get_msg(const bool is_enforce)
783 {
784 if (is_enforce)
785 return "ERROR";
786 else
787 return "WARNING";
788 }
789
790 /**
791 * tomoyo_check_flags - Check mode for specified functionality.
792 *
793 * @domain: Pointer to "struct tomoyo_domain_info".
794 * @index: The functionality to check mode.
795 *
796 * TOMOYO checks only process context.
797 * This code disables TOMOYO's enforcement in case the function is called from
798 * interrupt context.
799 */
800 unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain,
801 const u8 index)
802 {
803 const u8 profile = domain->profile;
804
805 if (WARN_ON(in_interrupt()))
806 return 0;
807 return tomoyo_policy_loaded && index < TOMOYO_MAX_CONTROL_INDEX
808 #if TOMOYO_MAX_PROFILES != 256
809 && profile < TOMOYO_MAX_PROFILES
810 #endif
811 && tomoyo_profile_ptr[profile] ?
812 tomoyo_profile_ptr[profile]->value[index] : 0;
813 }
814
815 /**
816 * tomoyo_verbose_mode - Check whether TOMOYO is verbose mode.
817 *
818 * @domain: Pointer to "struct tomoyo_domain_info".
819 *
820 * Returns true if domain policy violation warning should be printed to
821 * console.
822 */
823 bool tomoyo_verbose_mode(const struct tomoyo_domain_info *domain)
824 {
825 return tomoyo_check_flags(domain, TOMOYO_VERBOSE) != 0;
826 }
827
828 /**
829 * tomoyo_domain_quota_is_ok - Check for domain's quota.
830 *
831 * @domain: Pointer to "struct tomoyo_domain_info".
832 *
833 * Returns true if the domain is not exceeded quota, false otherwise.
834 *
835 * Caller holds tomoyo_read_lock().
836 */
837 bool tomoyo_domain_quota_is_ok(struct tomoyo_domain_info * const domain)
838 {
839 unsigned int count = 0;
840 struct tomoyo_acl_info *ptr;
841
842 if (!domain)
843 return true;
844 list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
845 if (ptr->type & TOMOYO_ACL_DELETED)
846 continue;
847 switch (tomoyo_acl_type2(ptr)) {
848 struct tomoyo_single_path_acl_record *acl;
849 u32 perm;
850 u8 i;
851 case TOMOYO_TYPE_SINGLE_PATH_ACL:
852 acl = container_of(ptr,
853 struct tomoyo_single_path_acl_record,
854 head);
855 perm = acl->perm | (((u32) acl->perm_high) << 16);
856 for (i = 0; i < TOMOYO_MAX_SINGLE_PATH_OPERATION; i++)
857 if (perm & (1 << i))
858 count++;
859 if (perm & (1 << TOMOYO_TYPE_READ_WRITE_ACL))
860 count -= 2;
861 break;
862 case TOMOYO_TYPE_DOUBLE_PATH_ACL:
863 perm = container_of(ptr,
864 struct tomoyo_double_path_acl_record,
865 head)->perm;
866 for (i = 0; i < TOMOYO_MAX_DOUBLE_PATH_OPERATION; i++)
867 if (perm & (1 << i))
868 count++;
869 break;
870 }
871 }
872 if (count < tomoyo_check_flags(domain, TOMOYO_MAX_ACCEPT_ENTRY))
873 return true;
874 if (!domain->quota_warned) {
875 domain->quota_warned = true;
876 printk(KERN_WARNING "TOMOYO-WARNING: "
877 "Domain '%s' has so many ACLs to hold. "
878 "Stopped learning mode.\n", domain->domainname->name);
879 }
880 return false;
881 }
882
883 /**
884 * tomoyo_find_or_assign_new_profile - Create a new profile.
885 *
886 * @profile: Profile number to create.
887 *
888 * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
889 */
890 static struct tomoyo_profile *tomoyo_find_or_assign_new_profile(const unsigned
891 int profile)
892 {
893 static DEFINE_MUTEX(lock);
894 struct tomoyo_profile *ptr = NULL;
895 int i;
896
897 if (profile >= TOMOYO_MAX_PROFILES)
898 return NULL;
899 mutex_lock(&lock);
900 ptr = tomoyo_profile_ptr[profile];
901 if (ptr)
902 goto ok;
903 ptr = kmalloc(sizeof(*ptr), GFP_KERNEL);
904 if (!tomoyo_memory_ok(ptr)) {
905 kfree(ptr);
906 goto ok;
907 }
908 for (i = 0; i < TOMOYO_MAX_CONTROL_INDEX; i++)
909 ptr->value[i] = tomoyo_control_array[i].current_value;
910 mb(); /* Avoid out-of-order execution. */
911 tomoyo_profile_ptr[profile] = ptr;
912 ok:
913 mutex_unlock(&lock);
914 return ptr;
915 }
916
917 /**
918 * tomoyo_write_profile - Write to profile table.
919 *
920 * @head: Pointer to "struct tomoyo_io_buffer".
921 *
922 * Returns 0 on success, negative value otherwise.
923 */
924 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
925 {
926 char *data = head->write_buf;
927 unsigned int i;
928 unsigned int value;
929 char *cp;
930 struct tomoyo_profile *profile;
931 unsigned long num;
932
933 cp = strchr(data, '-');
934 if (cp)
935 *cp = '\0';
936 if (strict_strtoul(data, 10, &num))
937 return -EINVAL;
938 if (cp)
939 data = cp + 1;
940 profile = tomoyo_find_or_assign_new_profile(num);
941 if (!profile)
942 return -EINVAL;
943 cp = strchr(data, '=');
944 if (!cp)
945 return -EINVAL;
946 *cp = '\0';
947 if (!strcmp(data, "COMMENT")) {
948 profile->comment = tomoyo_save_name(cp + 1);
949 return 0;
950 }
951 for (i = 0; i < TOMOYO_MAX_CONTROL_INDEX; i++) {
952 if (strcmp(data, tomoyo_control_array[i].keyword))
953 continue;
954 if (sscanf(cp + 1, "%u", &value) != 1) {
955 int j;
956 const char **modes;
957 switch (i) {
958 case TOMOYO_VERBOSE:
959 modes = tomoyo_mode_2;
960 break;
961 default:
962 modes = tomoyo_mode_4;
963 break;
964 }
965 for (j = 0; j < 4; j++) {
966 if (strcmp(cp + 1, modes[j]))
967 continue;
968 value = j;
969 break;
970 }
971 if (j == 4)
972 return -EINVAL;
973 } else if (value > tomoyo_control_array[i].max_value) {
974 value = tomoyo_control_array[i].max_value;
975 }
976 profile->value[i] = value;
977 return 0;
978 }
979 return -EINVAL;
980 }
981
982 /**
983 * tomoyo_read_profile - Read from profile table.
984 *
985 * @head: Pointer to "struct tomoyo_io_buffer".
986 *
987 * Returns 0.
988 */
989 static int tomoyo_read_profile(struct tomoyo_io_buffer *head)
990 {
991 static const int total = TOMOYO_MAX_CONTROL_INDEX + 1;
992 int step;
993
994 if (head->read_eof)
995 return 0;
996 for (step = head->read_step; step < TOMOYO_MAX_PROFILES * total;
997 step++) {
998 const u8 index = step / total;
999 u8 type = step % total;
1000 const struct tomoyo_profile *profile
1001 = tomoyo_profile_ptr[index];
1002 head->read_step = step;
1003 if (!profile)
1004 continue;
1005 if (!type) { /* Print profile' comment tag. */
1006 if (!tomoyo_io_printf(head, "%u-COMMENT=%s\n",
1007 index, profile->comment ?
1008 profile->comment->name : ""))
1009 break;
1010 continue;
1011 }
1012 type--;
1013 if (type < TOMOYO_MAX_CONTROL_INDEX) {
1014 const unsigned int value = profile->value[type];
1015 const char **modes = NULL;
1016 const char *keyword
1017 = tomoyo_control_array[type].keyword;
1018 switch (tomoyo_control_array[type].max_value) {
1019 case 3:
1020 modes = tomoyo_mode_4;
1021 break;
1022 case 1:
1023 modes = tomoyo_mode_2;
1024 break;
1025 }
1026 if (modes) {
1027 if (!tomoyo_io_printf(head, "%u-%s=%s\n", index,
1028 keyword, modes[value]))
1029 break;
1030 } else {
1031 if (!tomoyo_io_printf(head, "%u-%s=%u\n", index,
1032 keyword, value))
1033 break;
1034 }
1035 }
1036 }
1037 if (step == TOMOYO_MAX_PROFILES * total)
1038 head->read_eof = true;
1039 return 0;
1040 }
1041
1042 /*
1043 * tomoyo_policy_manager_entry is a structure which is used for holding list of
1044 * domainnames or programs which are permitted to modify configuration via
1045 * /sys/kernel/security/tomoyo/ interface.
1046 * It has following fields.
1047 *
1048 * (1) "list" which is linked to tomoyo_policy_manager_list .
1049 * (2) "manager" is a domainname or a program's pathname.
1050 * (3) "is_domain" is a bool which is true if "manager" is a domainname, false
1051 * otherwise.
1052 * (4) "is_deleted" is a bool which is true if marked as deleted, false
1053 * otherwise.
1054 */
1055 struct tomoyo_policy_manager_entry {
1056 struct list_head list;
1057 /* A path to program or a domainname. */
1058 const struct tomoyo_path_info *manager;
1059 bool is_domain; /* True if manager is a domainname. */
1060 bool is_deleted; /* True if this entry is deleted. */
1061 };
1062
1063 /*
1064 * tomoyo_policy_manager_list is used for holding list of domainnames or
1065 * programs which are permitted to modify configuration via
1066 * /sys/kernel/security/tomoyo/ interface.
1067 *
1068 * An entry is added by
1069 *
1070 * # echo '<kernel> /sbin/mingetty /bin/login /bin/bash' > \
1071 * /sys/kernel/security/tomoyo/manager
1072 * (if you want to specify by a domainname)
1073 *
1074 * or
1075 *
1076 * # echo '/usr/lib/ccs/editpolicy' > /sys/kernel/security/tomoyo/manager
1077 * (if you want to specify by a program's location)
1078 *
1079 * and is deleted by
1080 *
1081 * # echo 'delete <kernel> /sbin/mingetty /bin/login /bin/bash' > \
1082 * /sys/kernel/security/tomoyo/manager
1083 *
1084 * or
1085 *
1086 * # echo 'delete /usr/lib/ccs/editpolicy' > \
1087 * /sys/kernel/security/tomoyo/manager
1088 *
1089 * and all entries are retrieved by
1090 *
1091 * # cat /sys/kernel/security/tomoyo/manager
1092 */
1093 static LIST_HEAD(tomoyo_policy_manager_list);
1094
1095 /**
1096 * tomoyo_update_manager_entry - Add a manager entry.
1097 *
1098 * @manager: The path to manager or the domainnamme.
1099 * @is_delete: True if it is a delete request.
1100 *
1101 * Returns 0 on success, negative value otherwise.
1102 *
1103 * Caller holds tomoyo_read_lock().
1104 */
1105 static int tomoyo_update_manager_entry(const char *manager,
1106 const bool is_delete)
1107 {
1108 struct tomoyo_policy_manager_entry *new_entry;
1109 struct tomoyo_policy_manager_entry *ptr;
1110 const struct tomoyo_path_info *saved_manager;
1111 int error = -ENOMEM;
1112 bool is_domain = false;
1113
1114 if (tomoyo_is_domain_def(manager)) {
1115 if (!tomoyo_is_correct_domain(manager, __func__))
1116 return -EINVAL;
1117 is_domain = true;
1118 } else {
1119 if (!tomoyo_is_correct_path(manager, 1, -1, -1, __func__))
1120 return -EINVAL;
1121 }
1122 saved_manager = tomoyo_save_name(manager);
1123 if (!saved_manager)
1124 return -ENOMEM;
1125 new_entry = kmalloc(sizeof(*new_entry), GFP_KERNEL);
1126 mutex_lock(&tomoyo_policy_lock);
1127 list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) {
1128 if (ptr->manager != saved_manager)
1129 continue;
1130 ptr->is_deleted = is_delete;
1131 error = 0;
1132 goto out;
1133 }
1134 if (is_delete) {
1135 error = -ENOENT;
1136 goto out;
1137 }
1138 if (!tomoyo_memory_ok(new_entry))
1139 goto out;
1140 new_entry->manager = saved_manager;
1141 new_entry->is_domain = is_domain;
1142 list_add_tail_rcu(&new_entry->list, &tomoyo_policy_manager_list);
1143 new_entry = NULL;
1144 error = 0;
1145 out:
1146 mutex_unlock(&tomoyo_policy_lock);
1147 kfree(new_entry);
1148 return error;
1149 }
1150
1151 /**
1152 * tomoyo_write_manager_policy - Write manager policy.
1153 *
1154 * @head: Pointer to "struct tomoyo_io_buffer".
1155 *
1156 * Returns 0 on success, negative value otherwise.
1157 *
1158 * Caller holds tomoyo_read_lock().
1159 */
1160 static int tomoyo_write_manager_policy(struct tomoyo_io_buffer *head)
1161 {
1162 char *data = head->write_buf;
1163 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
1164
1165 if (!strcmp(data, "manage_by_non_root")) {
1166 tomoyo_manage_by_non_root = !is_delete;
1167 return 0;
1168 }
1169 return tomoyo_update_manager_entry(data, is_delete);
1170 }
1171
1172 /**
1173 * tomoyo_read_manager_policy - Read manager policy.
1174 *
1175 * @head: Pointer to "struct tomoyo_io_buffer".
1176 *
1177 * Returns 0.
1178 *
1179 * Caller holds tomoyo_read_lock().
1180 */
1181 static int tomoyo_read_manager_policy(struct tomoyo_io_buffer *head)
1182 {
1183 struct list_head *pos;
1184 bool done = true;
1185
1186 if (head->read_eof)
1187 return 0;
1188 list_for_each_cookie(pos, head->read_var2,
1189 &tomoyo_policy_manager_list) {
1190 struct tomoyo_policy_manager_entry *ptr;
1191 ptr = list_entry(pos, struct tomoyo_policy_manager_entry,
1192 list);
1193 if (ptr->is_deleted)
1194 continue;
1195 done = tomoyo_io_printf(head, "%s\n", ptr->manager->name);
1196 if (!done)
1197 break;
1198 }
1199 head->read_eof = done;
1200 return 0;
1201 }
1202
1203 /**
1204 * tomoyo_is_policy_manager - Check whether the current process is a policy manager.
1205 *
1206 * Returns true if the current process is permitted to modify policy
1207 * via /sys/kernel/security/tomoyo/ interface.
1208 *
1209 * Caller holds tomoyo_read_lock().
1210 */
1211 static bool tomoyo_is_policy_manager(void)
1212 {
1213 struct tomoyo_policy_manager_entry *ptr;
1214 const char *exe;
1215 const struct task_struct *task = current;
1216 const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
1217 bool found = false;
1218
1219 if (!tomoyo_policy_loaded)
1220 return true;
1221 if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
1222 return false;
1223 list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) {
1224 if (!ptr->is_deleted && ptr->is_domain
1225 && !tomoyo_pathcmp(domainname, ptr->manager)) {
1226 found = true;
1227 break;
1228 }
1229 }
1230 if (found)
1231 return true;
1232 exe = tomoyo_get_exe();
1233 if (!exe)
1234 return false;
1235 list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) {
1236 if (!ptr->is_deleted && !ptr->is_domain
1237 && !strcmp(exe, ptr->manager->name)) {
1238 found = true;
1239 break;
1240 }
1241 }
1242 if (!found) { /* Reduce error messages. */
1243 static pid_t last_pid;
1244 const pid_t pid = current->pid;
1245 if (last_pid != pid) {
1246 printk(KERN_WARNING "%s ( %s ) is not permitted to "
1247 "update policies.\n", domainname->name, exe);
1248 last_pid = pid;
1249 }
1250 }
1251 tomoyo_free(exe);
1252 return found;
1253 }
1254
1255 /**
1256 * tomoyo_is_select_one - Parse select command.
1257 *
1258 * @head: Pointer to "struct tomoyo_io_buffer".
1259 * @data: String to parse.
1260 *
1261 * Returns true on success, false otherwise.
1262 *
1263 * Caller holds tomoyo_read_lock().
1264 */
1265 static bool tomoyo_is_select_one(struct tomoyo_io_buffer *head,
1266 const char *data)
1267 {
1268 unsigned int pid;
1269 struct tomoyo_domain_info *domain = NULL;
1270
1271 if (sscanf(data, "pid=%u", &pid) == 1) {
1272 struct task_struct *p;
1273 read_lock(&tasklist_lock);
1274 p = find_task_by_vpid(pid);
1275 if (p)
1276 domain = tomoyo_real_domain(p);
1277 read_unlock(&tasklist_lock);
1278 } else if (!strncmp(data, "domain=", 7)) {
1279 if (tomoyo_is_domain_def(data + 7))
1280 domain = tomoyo_find_domain(data + 7);
1281 } else
1282 return false;
1283 head->write_var1 = domain;
1284 /* Accessing read_buf is safe because head->io_sem is held. */
1285 if (!head->read_buf)
1286 return true; /* Do nothing if open(O_WRONLY). */
1287 head->read_avail = 0;
1288 tomoyo_io_printf(head, "# select %s\n", data);
1289 head->read_single_domain = true;
1290 head->read_eof = !domain;
1291 if (domain) {
1292 struct tomoyo_domain_info *d;
1293 head->read_var1 = NULL;
1294 list_for_each_entry_rcu(d, &tomoyo_domain_list, list) {
1295 if (d == domain)
1296 break;
1297 head->read_var1 = &d->list;
1298 }
1299 head->read_var2 = NULL;
1300 head->read_bit = 0;
1301 head->read_step = 0;
1302 if (domain->is_deleted)
1303 tomoyo_io_printf(head, "# This is a deleted domain.\n");
1304 }
1305 return true;
1306 }
1307
1308 /**
1309 * tomoyo_delete_domain - Delete a domain.
1310 *
1311 * @domainname: The name of domain.
1312 *
1313 * Returns 0.
1314 *
1315 * Caller holds tomoyo_read_lock().
1316 */
1317 static int tomoyo_delete_domain(char *domainname)
1318 {
1319 struct tomoyo_domain_info *domain;
1320 struct tomoyo_path_info name;
1321
1322 name.name = domainname;
1323 tomoyo_fill_path_info(&name);
1324 mutex_lock(&tomoyo_policy_lock);
1325 /* Is there an active domain? */
1326 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1327 /* Never delete tomoyo_kernel_domain */
1328 if (domain == &tomoyo_kernel_domain)
1329 continue;
1330 if (domain->is_deleted ||
1331 tomoyo_pathcmp(domain->domainname, &name))
1332 continue;
1333 domain->is_deleted = true;
1334 break;
1335 }
1336 mutex_unlock(&tomoyo_policy_lock);
1337 return 0;
1338 }
1339
1340 /**
1341 * tomoyo_write_domain_policy - Write domain policy.
1342 *
1343 * @head: Pointer to "struct tomoyo_io_buffer".
1344 *
1345 * Returns 0 on success, negative value otherwise.
1346 *
1347 * Caller holds tomoyo_read_lock().
1348 */
1349 static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head)
1350 {
1351 char *data = head->write_buf;
1352 struct tomoyo_domain_info *domain = head->write_var1;
1353 bool is_delete = false;
1354 bool is_select = false;
1355 unsigned int profile;
1356
1357 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE))
1358 is_delete = true;
1359 else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT))
1360 is_select = true;
1361 if (is_select && tomoyo_is_select_one(head, data))
1362 return 0;
1363 /* Don't allow updating policies by non manager programs. */
1364 if (!tomoyo_is_policy_manager())
1365 return -EPERM;
1366 if (tomoyo_is_domain_def(data)) {
1367 domain = NULL;
1368 if (is_delete)
1369 tomoyo_delete_domain(data);
1370 else if (is_select)
1371 domain = tomoyo_find_domain(data);
1372 else
1373 domain = tomoyo_find_or_assign_new_domain(data, 0);
1374 head->write_var1 = domain;
1375 return 0;
1376 }
1377 if (!domain)
1378 return -EINVAL;
1379
1380 if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1
1381 && profile < TOMOYO_MAX_PROFILES) {
1382 if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)
1383 domain->profile = (u8) profile;
1384 return 0;
1385 }
1386 if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) {
1387 tomoyo_set_domain_flag(domain, is_delete,
1388 TOMOYO_DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ);
1389 return 0;
1390 }
1391 return tomoyo_write_file_policy(data, domain, is_delete);
1392 }
1393
1394 /**
1395 * tomoyo_print_single_path_acl - Print a single path ACL entry.
1396 *
1397 * @head: Pointer to "struct tomoyo_io_buffer".
1398 * @ptr: Pointer to "struct tomoyo_single_path_acl_record".
1399 *
1400 * Returns true on success, false otherwise.
1401 */
1402 static bool tomoyo_print_single_path_acl(struct tomoyo_io_buffer *head,
1403 struct tomoyo_single_path_acl_record *
1404 ptr)
1405 {
1406 int pos;
1407 u8 bit;
1408 const char *atmark = "";
1409 const char *filename;
1410 const u32 perm = ptr->perm | (((u32) ptr->perm_high) << 16);
1411
1412 filename = ptr->filename->name;
1413 for (bit = head->read_bit; bit < TOMOYO_MAX_SINGLE_PATH_OPERATION;
1414 bit++) {
1415 const char *msg;
1416 if (!(perm & (1 << bit)))
1417 continue;
1418 /* Print "read/write" instead of "read" and "write". */
1419 if ((bit == TOMOYO_TYPE_READ_ACL ||
1420 bit == TOMOYO_TYPE_WRITE_ACL)
1421 && (perm & (1 << TOMOYO_TYPE_READ_WRITE_ACL)))
1422 continue;
1423 msg = tomoyo_sp2keyword(bit);
1424 pos = head->read_avail;
1425 if (!tomoyo_io_printf(head, "allow_%s %s%s\n", msg,
1426 atmark, filename))
1427 goto out;
1428 }
1429 head->read_bit = 0;
1430 return true;
1431 out:
1432 head->read_bit = bit;
1433 head->read_avail = pos;
1434 return false;
1435 }
1436
1437 /**
1438 * tomoyo_print_double_path_acl - Print a double path ACL entry.
1439 *
1440 * @head: Pointer to "struct tomoyo_io_buffer".
1441 * @ptr: Pointer to "struct tomoyo_double_path_acl_record".
1442 *
1443 * Returns true on success, false otherwise.
1444 */
1445 static bool tomoyo_print_double_path_acl(struct tomoyo_io_buffer *head,
1446 struct tomoyo_double_path_acl_record *
1447 ptr)
1448 {
1449 int pos;
1450 const char *atmark1 = "";
1451 const char *atmark2 = "";
1452 const char *filename1;
1453 const char *filename2;
1454 const u8 perm = ptr->perm;
1455 u8 bit;
1456
1457 filename1 = ptr->filename1->name;
1458 filename2 = ptr->filename2->name;
1459 for (bit = head->read_bit; bit < TOMOYO_MAX_DOUBLE_PATH_OPERATION;
1460 bit++) {
1461 const char *msg;
1462 if (!(perm & (1 << bit)))
1463 continue;
1464 msg = tomoyo_dp2keyword(bit);
1465 pos = head->read_avail;
1466 if (!tomoyo_io_printf(head, "allow_%s %s%s %s%s\n", msg,
1467 atmark1, filename1, atmark2, filename2))
1468 goto out;
1469 }
1470 head->read_bit = 0;
1471 return true;
1472 out:
1473 head->read_bit = bit;
1474 head->read_avail = pos;
1475 return false;
1476 }
1477
1478 /**
1479 * tomoyo_print_entry - Print an ACL entry.
1480 *
1481 * @head: Pointer to "struct tomoyo_io_buffer".
1482 * @ptr: Pointer to an ACL entry.
1483 *
1484 * Returns true on success, false otherwise.
1485 */
1486 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1487 struct tomoyo_acl_info *ptr)
1488 {
1489 const u8 acl_type = tomoyo_acl_type2(ptr);
1490
1491 if (acl_type & TOMOYO_ACL_DELETED)
1492 return true;
1493 if (acl_type == TOMOYO_TYPE_SINGLE_PATH_ACL) {
1494 struct tomoyo_single_path_acl_record *acl
1495 = container_of(ptr,
1496 struct tomoyo_single_path_acl_record,
1497 head);
1498 return tomoyo_print_single_path_acl(head, acl);
1499 }
1500 if (acl_type == TOMOYO_TYPE_DOUBLE_PATH_ACL) {
1501 struct tomoyo_double_path_acl_record *acl
1502 = container_of(ptr,
1503 struct tomoyo_double_path_acl_record,
1504 head);
1505 return tomoyo_print_double_path_acl(head, acl);
1506 }
1507 BUG(); /* This must not happen. */
1508 return false;
1509 }
1510
1511 /**
1512 * tomoyo_read_domain_policy - Read domain policy.
1513 *
1514 * @head: Pointer to "struct tomoyo_io_buffer".
1515 *
1516 * Returns 0.
1517 *
1518 * Caller holds tomoyo_read_lock().
1519 */
1520 static int tomoyo_read_domain_policy(struct tomoyo_io_buffer *head)
1521 {
1522 struct list_head *dpos;
1523 struct list_head *apos;
1524 bool done = true;
1525
1526 if (head->read_eof)
1527 return 0;
1528 if (head->read_step == 0)
1529 head->read_step = 1;
1530 list_for_each_cookie(dpos, head->read_var1, &tomoyo_domain_list) {
1531 struct tomoyo_domain_info *domain;
1532 const char *quota_exceeded = "";
1533 const char *transition_failed = "";
1534 const char *ignore_global_allow_read = "";
1535 domain = list_entry(dpos, struct tomoyo_domain_info, list);
1536 if (head->read_step != 1)
1537 goto acl_loop;
1538 if (domain->is_deleted && !head->read_single_domain)
1539 continue;
1540 /* Print domainname and flags. */
1541 if (domain->quota_warned)
1542 quota_exceeded = "quota_exceeded\n";
1543 if (domain->flags & TOMOYO_DOMAIN_FLAGS_TRANSITION_FAILED)
1544 transition_failed = "transition_failed\n";
1545 if (domain->flags &
1546 TOMOYO_DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ)
1547 ignore_global_allow_read
1548 = TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n";
1549 done = tomoyo_io_printf(head, "%s\n" TOMOYO_KEYWORD_USE_PROFILE
1550 "%u\n%s%s%s\n",
1551 domain->domainname->name,
1552 domain->profile, quota_exceeded,
1553 transition_failed,
1554 ignore_global_allow_read);
1555 if (!done)
1556 break;
1557 head->read_step = 2;
1558 acl_loop:
1559 if (head->read_step == 3)
1560 goto tail_mark;
1561 /* Print ACL entries in the domain. */
1562 list_for_each_cookie(apos, head->read_var2,
1563 &domain->acl_info_list) {
1564 struct tomoyo_acl_info *ptr
1565 = list_entry(apos, struct tomoyo_acl_info,
1566 list);
1567 done = tomoyo_print_entry(head, ptr);
1568 if (!done)
1569 break;
1570 }
1571 if (!done)
1572 break;
1573 head->read_step = 3;
1574 tail_mark:
1575 done = tomoyo_io_printf(head, "\n");
1576 if (!done)
1577 break;
1578 head->read_step = 1;
1579 if (head->read_single_domain)
1580 break;
1581 }
1582 head->read_eof = done;
1583 return 0;
1584 }
1585
1586 /**
1587 * tomoyo_write_domain_profile - Assign profile for specified domain.
1588 *
1589 * @head: Pointer to "struct tomoyo_io_buffer".
1590 *
1591 * Returns 0 on success, -EINVAL otherwise.
1592 *
1593 * This is equivalent to doing
1594 *
1595 * ( echo "select " $domainname; echo "use_profile " $profile ) |
1596 * /usr/lib/ccs/loadpolicy -d
1597 *
1598 * Caller holds tomoyo_read_lock().
1599 */
1600 static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head)
1601 {
1602 char *data = head->write_buf;
1603 char *cp = strchr(data, ' ');
1604 struct tomoyo_domain_info *domain;
1605 unsigned long profile;
1606
1607 if (!cp)
1608 return -EINVAL;
1609 *cp = '\0';
1610 domain = tomoyo_find_domain(cp + 1);
1611 if (strict_strtoul(data, 10, &profile))
1612 return -EINVAL;
1613 if (domain && profile < TOMOYO_MAX_PROFILES
1614 && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded))
1615 domain->profile = (u8) profile;
1616 return 0;
1617 }
1618
1619 /**
1620 * tomoyo_read_domain_profile - Read only domainname and profile.
1621 *
1622 * @head: Pointer to "struct tomoyo_io_buffer".
1623 *
1624 * Returns list of profile number and domainname pairs.
1625 *
1626 * This is equivalent to doing
1627 *
1628 * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy |
1629 * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" )
1630 * domainname = $0; } else if ( $1 == "use_profile" ) {
1631 * print $2 " " domainname; domainname = ""; } } ; '
1632 *
1633 * Caller holds tomoyo_read_lock().
1634 */
1635 static int tomoyo_read_domain_profile(struct tomoyo_io_buffer *head)
1636 {
1637 struct list_head *pos;
1638 bool done = true;
1639
1640 if (head->read_eof)
1641 return 0;
1642 list_for_each_cookie(pos, head->read_var1, &tomoyo_domain_list) {
1643 struct tomoyo_domain_info *domain;
1644 domain = list_entry(pos, struct tomoyo_domain_info, list);
1645 if (domain->is_deleted)
1646 continue;
1647 done = tomoyo_io_printf(head, "%u %s\n", domain->profile,
1648 domain->domainname->name);
1649 if (!done)
1650 break;
1651 }
1652 head->read_eof = done;
1653 return 0;
1654 }
1655
1656 /**
1657 * tomoyo_write_pid: Specify PID to obtain domainname.
1658 *
1659 * @head: Pointer to "struct tomoyo_io_buffer".
1660 *
1661 * Returns 0.
1662 */
1663 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1664 {
1665 unsigned long pid;
1666 /* No error check. */
1667 strict_strtoul(head->write_buf, 10, &pid);
1668 head->read_step = (int) pid;
1669 head->read_eof = false;
1670 return 0;
1671 }
1672
1673 /**
1674 * tomoyo_read_pid - Get domainname of the specified PID.
1675 *
1676 * @head: Pointer to "struct tomoyo_io_buffer".
1677 *
1678 * Returns the domainname which the specified PID is in on success,
1679 * empty string otherwise.
1680 * The PID is specified by tomoyo_write_pid() so that the user can obtain
1681 * using read()/write() interface rather than sysctl() interface.
1682 */
1683 static int tomoyo_read_pid(struct tomoyo_io_buffer *head)
1684 {
1685 if (head->read_avail == 0 && !head->read_eof) {
1686 const int pid = head->read_step;
1687 struct task_struct *p;
1688 struct tomoyo_domain_info *domain = NULL;
1689 read_lock(&tasklist_lock);
1690 p = find_task_by_vpid(pid);
1691 if (p)
1692 domain = tomoyo_real_domain(p);
1693 read_unlock(&tasklist_lock);
1694 if (domain)
1695 tomoyo_io_printf(head, "%d %u %s", pid, domain->profile,
1696 domain->domainname->name);
1697 head->read_eof = true;
1698 }
1699 return 0;
1700 }
1701
1702 /**
1703 * tomoyo_write_exception_policy - Write exception policy.
1704 *
1705 * @head: Pointer to "struct tomoyo_io_buffer".
1706 *
1707 * Returns 0 on success, negative value otherwise.
1708 *
1709 * Caller holds tomoyo_read_lock().
1710 */
1711 static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head)
1712 {
1713 char *data = head->write_buf;
1714 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
1715
1716 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_KEEP_DOMAIN))
1717 return tomoyo_write_domain_keeper_policy(data, false,
1718 is_delete);
1719 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_KEEP_DOMAIN))
1720 return tomoyo_write_domain_keeper_policy(data, true, is_delete);
1721 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_INITIALIZE_DOMAIN))
1722 return tomoyo_write_domain_initializer_policy(data, false,
1723 is_delete);
1724 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN))
1725 return tomoyo_write_domain_initializer_policy(data, true,
1726 is_delete);
1727 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALIAS))
1728 return tomoyo_write_alias_policy(data, is_delete);
1729 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ))
1730 return tomoyo_write_globally_readable_policy(data, is_delete);
1731 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN))
1732 return tomoyo_write_pattern_policy(data, is_delete);
1733 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE))
1734 return tomoyo_write_no_rewrite_policy(data, is_delete);
1735 return -EINVAL;
1736 }
1737
1738 /**
1739 * tomoyo_read_exception_policy - Read exception policy.
1740 *
1741 * @head: Pointer to "struct tomoyo_io_buffer".
1742 *
1743 * Returns 0 on success, -EINVAL otherwise.
1744 *
1745 * Caller holds tomoyo_read_lock().
1746 */
1747 static int tomoyo_read_exception_policy(struct tomoyo_io_buffer *head)
1748 {
1749 if (!head->read_eof) {
1750 switch (head->read_step) {
1751 case 0:
1752 head->read_var2 = NULL;
1753 head->read_step = 1;
1754 case 1:
1755 if (!tomoyo_read_domain_keeper_policy(head))
1756 break;
1757 head->read_var2 = NULL;
1758 head->read_step = 2;
1759 case 2:
1760 if (!tomoyo_read_globally_readable_policy(head))
1761 break;
1762 head->read_var2 = NULL;
1763 head->read_step = 3;
1764 case 3:
1765 head->read_var2 = NULL;
1766 head->read_step = 4;
1767 case 4:
1768 if (!tomoyo_read_domain_initializer_policy(head))
1769 break;
1770 head->read_var2 = NULL;
1771 head->read_step = 5;
1772 case 5:
1773 if (!tomoyo_read_alias_policy(head))
1774 break;
1775 head->read_var2 = NULL;
1776 head->read_step = 6;
1777 case 6:
1778 head->read_var2 = NULL;
1779 head->read_step = 7;
1780 case 7:
1781 if (!tomoyo_read_file_pattern(head))
1782 break;
1783 head->read_var2 = NULL;
1784 head->read_step = 8;
1785 case 8:
1786 if (!tomoyo_read_no_rewrite_policy(head))
1787 break;
1788 head->read_var2 = NULL;
1789 head->read_step = 9;
1790 case 9:
1791 head->read_eof = true;
1792 break;
1793 default:
1794 return -EINVAL;
1795 }
1796 }
1797 return 0;
1798 }
1799
1800 /* path to policy loader */
1801 static const char *tomoyo_loader = "/sbin/tomoyo-init";
1802
1803 /**
1804 * tomoyo_policy_loader_exists - Check whether /sbin/tomoyo-init exists.
1805 *
1806 * Returns true if /sbin/tomoyo-init exists, false otherwise.
1807 */
1808 static bool tomoyo_policy_loader_exists(void)
1809 {
1810 /*
1811 * Don't activate MAC if the policy loader doesn't exist.
1812 * If the initrd includes /sbin/init but real-root-dev has not
1813 * mounted on / yet, activating MAC will block the system since
1814 * policies are not loaded yet.
1815 * Thus, let do_execve() call this function everytime.
1816 */
1817 struct path path;
1818
1819 if (kern_path(tomoyo_loader, LOOKUP_FOLLOW, &path)) {
1820 printk(KERN_INFO "Not activating Mandatory Access Control now "
1821 "since %s doesn't exist.\n", tomoyo_loader);
1822 return false;
1823 }
1824 path_put(&path);
1825 return true;
1826 }
1827
1828 /**
1829 * tomoyo_load_policy - Run external policy loader to load policy.
1830 *
1831 * @filename: The program about to start.
1832 *
1833 * This function checks whether @filename is /sbin/init , and if so
1834 * invoke /sbin/tomoyo-init and wait for the termination of /sbin/tomoyo-init
1835 * and then continues invocation of /sbin/init.
1836 * /sbin/tomoyo-init reads policy files in /etc/tomoyo/ directory and
1837 * writes to /sys/kernel/security/tomoyo/ interfaces.
1838 *
1839 * Returns nothing.
1840 */
1841 void tomoyo_load_policy(const char *filename)
1842 {
1843 char *argv[2];
1844 char *envp[3];
1845
1846 if (tomoyo_policy_loaded)
1847 return;
1848 /*
1849 * Check filename is /sbin/init or /sbin/tomoyo-start.
1850 * /sbin/tomoyo-start is a dummy filename in case where /sbin/init can't
1851 * be passed.
1852 * You can create /sbin/tomoyo-start by
1853 * "ln -s /bin/true /sbin/tomoyo-start".
1854 */
1855 if (strcmp(filename, "/sbin/init") &&
1856 strcmp(filename, "/sbin/tomoyo-start"))
1857 return;
1858 if (!tomoyo_policy_loader_exists())
1859 return;
1860
1861 printk(KERN_INFO "Calling %s to load policy. Please wait.\n",
1862 tomoyo_loader);
1863 argv[0] = (char *) tomoyo_loader;
1864 argv[1] = NULL;
1865 envp[0] = "HOME=/";
1866 envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
1867 envp[2] = NULL;
1868 call_usermodehelper(argv[0], argv, envp, 1);
1869
1870 printk(KERN_INFO "TOMOYO: 2.2.0 2009/04/01\n");
1871 printk(KERN_INFO "Mandatory Access Control activated.\n");
1872 tomoyo_policy_loaded = true;
1873 { /* Check all profiles currently assigned to domains are defined. */
1874 struct tomoyo_domain_info *domain;
1875 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1876 const u8 profile = domain->profile;
1877 if (tomoyo_profile_ptr[profile])
1878 continue;
1879 panic("Profile %u (used by '%s') not defined.\n",
1880 profile, domain->domainname->name);
1881 }
1882 }
1883 }
1884
1885 /**
1886 * tomoyo_read_version: Get version.
1887 *
1888 * @head: Pointer to "struct tomoyo_io_buffer".
1889 *
1890 * Returns version information.
1891 */
1892 static int tomoyo_read_version(struct tomoyo_io_buffer *head)
1893 {
1894 if (!head->read_eof) {
1895 tomoyo_io_printf(head, "2.2.0");
1896 head->read_eof = true;
1897 }
1898 return 0;
1899 }
1900
1901 /**
1902 * tomoyo_read_self_domain - Get the current process's domainname.
1903 *
1904 * @head: Pointer to "struct tomoyo_io_buffer".
1905 *
1906 * Returns the current process's domainname.
1907 */
1908 static int tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
1909 {
1910 if (!head->read_eof) {
1911 /*
1912 * tomoyo_domain()->domainname != NULL
1913 * because every process belongs to a domain and
1914 * the domain's name cannot be NULL.
1915 */
1916 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
1917 head->read_eof = true;
1918 }
1919 return 0;
1920 }
1921
1922 /**
1923 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
1924 *
1925 * @type: Type of interface.
1926 * @file: Pointer to "struct file".
1927 *
1928 * Associates policy handler and returns 0 on success, -ENOMEM otherwise.
1929 *
1930 * Caller acquires tomoyo_read_lock().
1931 */
1932 static int tomoyo_open_control(const u8 type, struct file *file)
1933 {
1934 struct tomoyo_io_buffer *head = tomoyo_alloc(sizeof(*head));
1935
1936 if (!head)
1937 return -ENOMEM;
1938 mutex_init(&head->io_sem);
1939 switch (type) {
1940 case TOMOYO_DOMAINPOLICY:
1941 /* /sys/kernel/security/tomoyo/domain_policy */
1942 head->write = tomoyo_write_domain_policy;
1943 head->read = tomoyo_read_domain_policy;
1944 break;
1945 case TOMOYO_EXCEPTIONPOLICY:
1946 /* /sys/kernel/security/tomoyo/exception_policy */
1947 head->write = tomoyo_write_exception_policy;
1948 head->read = tomoyo_read_exception_policy;
1949 break;
1950 case TOMOYO_SELFDOMAIN:
1951 /* /sys/kernel/security/tomoyo/self_domain */
1952 head->read = tomoyo_read_self_domain;
1953 break;
1954 case TOMOYO_DOMAIN_STATUS:
1955 /* /sys/kernel/security/tomoyo/.domain_status */
1956 head->write = tomoyo_write_domain_profile;
1957 head->read = tomoyo_read_domain_profile;
1958 break;
1959 case TOMOYO_PROCESS_STATUS:
1960 /* /sys/kernel/security/tomoyo/.process_status */
1961 head->write = tomoyo_write_pid;
1962 head->read = tomoyo_read_pid;
1963 break;
1964 case TOMOYO_VERSION:
1965 /* /sys/kernel/security/tomoyo/version */
1966 head->read = tomoyo_read_version;
1967 head->readbuf_size = 128;
1968 break;
1969 case TOMOYO_MEMINFO:
1970 /* /sys/kernel/security/tomoyo/meminfo */
1971 head->write = tomoyo_write_memory_quota;
1972 head->read = tomoyo_read_memory_counter;
1973 head->readbuf_size = 512;
1974 break;
1975 case TOMOYO_PROFILE:
1976 /* /sys/kernel/security/tomoyo/profile */
1977 head->write = tomoyo_write_profile;
1978 head->read = tomoyo_read_profile;
1979 break;
1980 case TOMOYO_MANAGER:
1981 /* /sys/kernel/security/tomoyo/manager */
1982 head->write = tomoyo_write_manager_policy;
1983 head->read = tomoyo_read_manager_policy;
1984 break;
1985 }
1986 if (!(file->f_mode & FMODE_READ)) {
1987 /*
1988 * No need to allocate read_buf since it is not opened
1989 * for reading.
1990 */
1991 head->read = NULL;
1992 } else {
1993 if (!head->readbuf_size)
1994 head->readbuf_size = 4096 * 2;
1995 head->read_buf = tomoyo_alloc(head->readbuf_size);
1996 if (!head->read_buf) {
1997 tomoyo_free(head);
1998 return -ENOMEM;
1999 }
2000 }
2001 if (!(file->f_mode & FMODE_WRITE)) {
2002 /*
2003 * No need to allocate write_buf since it is not opened
2004 * for writing.
2005 */
2006 head->write = NULL;
2007 } else if (head->write) {
2008 head->writebuf_size = 4096 * 2;
2009 head->write_buf = tomoyo_alloc(head->writebuf_size);
2010 if (!head->write_buf) {
2011 tomoyo_free(head->read_buf);
2012 tomoyo_free(head);
2013 return -ENOMEM;
2014 }
2015 }
2016 head->reader_idx = tomoyo_read_lock();
2017 file->private_data = head;
2018 /*
2019 * Call the handler now if the file is
2020 * /sys/kernel/security/tomoyo/self_domain
2021 * so that the user can use
2022 * cat < /sys/kernel/security/tomoyo/self_domain"
2023 * to know the current process's domainname.
2024 */
2025 if (type == TOMOYO_SELFDOMAIN)
2026 tomoyo_read_control(file, NULL, 0);
2027 return 0;
2028 }
2029
2030 /**
2031 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2032 *
2033 * @file: Pointer to "struct file".
2034 * @buffer: Poiner to buffer to write to.
2035 * @buffer_len: Size of @buffer.
2036 *
2037 * Returns bytes read on success, negative value otherwise.
2038 *
2039 * Caller holds tomoyo_read_lock().
2040 */
2041 static int tomoyo_read_control(struct file *file, char __user *buffer,
2042 const int buffer_len)
2043 {
2044 int len = 0;
2045 struct tomoyo_io_buffer *head = file->private_data;
2046 char *cp;
2047
2048 if (!head->read)
2049 return -ENOSYS;
2050 if (mutex_lock_interruptible(&head->io_sem))
2051 return -EINTR;
2052 /* Call the policy handler. */
2053 len = head->read(head);
2054 if (len < 0)
2055 goto out;
2056 /* Write to buffer. */
2057 len = head->read_avail;
2058 if (len > buffer_len)
2059 len = buffer_len;
2060 if (!len)
2061 goto out;
2062 /* head->read_buf changes by some functions. */
2063 cp = head->read_buf;
2064 if (copy_to_user(buffer, cp, len)) {
2065 len = -EFAULT;
2066 goto out;
2067 }
2068 head->read_avail -= len;
2069 memmove(cp, cp + len, head->read_avail);
2070 out:
2071 mutex_unlock(&head->io_sem);
2072 return len;
2073 }
2074
2075 /**
2076 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2077 *
2078 * @file: Pointer to "struct file".
2079 * @buffer: Pointer to buffer to read from.
2080 * @buffer_len: Size of @buffer.
2081 *
2082 * Returns @buffer_len on success, negative value otherwise.
2083 *
2084 * Caller holds tomoyo_read_lock().
2085 */
2086 static int tomoyo_write_control(struct file *file, const char __user *buffer,
2087 const int buffer_len)
2088 {
2089 struct tomoyo_io_buffer *head = file->private_data;
2090 int error = buffer_len;
2091 int avail_len = buffer_len;
2092 char *cp0 = head->write_buf;
2093
2094 if (!head->write)
2095 return -ENOSYS;
2096 if (!access_ok(VERIFY_READ, buffer, buffer_len))
2097 return -EFAULT;
2098 /* Don't allow updating policies by non manager programs. */
2099 if (head->write != tomoyo_write_pid &&
2100 head->write != tomoyo_write_domain_policy &&
2101 !tomoyo_is_policy_manager())
2102 return -EPERM;
2103 if (mutex_lock_interruptible(&head->io_sem))
2104 return -EINTR;
2105 /* Read a line and dispatch it to the policy handler. */
2106 while (avail_len > 0) {
2107 char c;
2108 if (head->write_avail >= head->writebuf_size - 1) {
2109 error = -ENOMEM;
2110 break;
2111 } else if (get_user(c, buffer)) {
2112 error = -EFAULT;
2113 break;
2114 }
2115 buffer++;
2116 avail_len--;
2117 cp0[head->write_avail++] = c;
2118 if (c != '\n')
2119 continue;
2120 cp0[head->write_avail - 1] = '\0';
2121 head->write_avail = 0;
2122 tomoyo_normalize_line(cp0);
2123 head->write(head);
2124 }
2125 mutex_unlock(&head->io_sem);
2126 return error;
2127 }
2128
2129 /**
2130 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2131 *
2132 * @file: Pointer to "struct file".
2133 *
2134 * Releases memory and returns 0.
2135 *
2136 * Caller looses tomoyo_read_lock().
2137 */
2138 static int tomoyo_close_control(struct file *file)
2139 {
2140 struct tomoyo_io_buffer *head = file->private_data;
2141
2142 tomoyo_read_unlock(head->reader_idx);
2143 /* Release memory used for policy I/O. */
2144 tomoyo_free(head->read_buf);
2145 head->read_buf = NULL;
2146 tomoyo_free(head->write_buf);
2147 head->write_buf = NULL;
2148 tomoyo_free(head);
2149 head = NULL;
2150 file->private_data = NULL;
2151 return 0;
2152 }
2153
2154 /**
2155 * tomoyo_open - open() for /sys/kernel/security/tomoyo/ interface.
2156 *
2157 * @inode: Pointer to "struct inode".
2158 * @file: Pointer to "struct file".
2159 *
2160 * Returns 0 on success, negative value otherwise.
2161 */
2162 static int tomoyo_open(struct inode *inode, struct file *file)
2163 {
2164 const int key = ((u8 *) file->f_path.dentry->d_inode->i_private)
2165 - ((u8 *) NULL);
2166 return tomoyo_open_control(key, file);
2167 }
2168
2169 /**
2170 * tomoyo_release - close() for /sys/kernel/security/tomoyo/ interface.
2171 *
2172 * @inode: Pointer to "struct inode".
2173 * @file: Pointer to "struct file".
2174 *
2175 * Returns 0 on success, negative value otherwise.
2176 */
2177 static int tomoyo_release(struct inode *inode, struct file *file)
2178 {
2179 return tomoyo_close_control(file);
2180 }
2181
2182 /**
2183 * tomoyo_read - read() for /sys/kernel/security/tomoyo/ interface.
2184 *
2185 * @file: Pointer to "struct file".
2186 * @buf: Pointer to buffer.
2187 * @count: Size of @buf.
2188 * @ppos: Unused.
2189 *
2190 * Returns bytes read on success, negative value otherwise.
2191 */
2192 static ssize_t tomoyo_read(struct file *file, char __user *buf, size_t count,
2193 loff_t *ppos)
2194 {
2195 return tomoyo_read_control(file, buf, count);
2196 }
2197
2198 /**
2199 * tomoyo_write - write() for /sys/kernel/security/tomoyo/ interface.
2200 *
2201 * @file: Pointer to "struct file".
2202 * @buf: Pointer to buffer.
2203 * @count: Size of @buf.
2204 * @ppos: Unused.
2205 *
2206 * Returns @count on success, negative value otherwise.
2207 */
2208 static ssize_t tomoyo_write(struct file *file, const char __user *buf,
2209 size_t count, loff_t *ppos)
2210 {
2211 return tomoyo_write_control(file, buf, count);
2212 }
2213
2214 /*
2215 * tomoyo_operations is a "struct file_operations" which is used for handling
2216 * /sys/kernel/security/tomoyo/ interface.
2217 *
2218 * Some files under /sys/kernel/security/tomoyo/ directory accept open(O_RDWR).
2219 * See tomoyo_io_buffer for internals.
2220 */
2221 static const struct file_operations tomoyo_operations = {
2222 .open = tomoyo_open,
2223 .release = tomoyo_release,
2224 .read = tomoyo_read,
2225 .write = tomoyo_write,
2226 };
2227
2228 /**
2229 * tomoyo_create_entry - Create interface files under /sys/kernel/security/tomoyo/ directory.
2230 *
2231 * @name: The name of the interface file.
2232 * @mode: The permission of the interface file.
2233 * @parent: The parent directory.
2234 * @key: Type of interface.
2235 *
2236 * Returns nothing.
2237 */
2238 static void __init tomoyo_create_entry(const char *name, const mode_t mode,
2239 struct dentry *parent, const u8 key)
2240 {
2241 securityfs_create_file(name, mode, parent, ((u8 *) NULL) + key,
2242 &tomoyo_operations);
2243 }
2244
2245 /**
2246 * tomoyo_initerface_init - Initialize /sys/kernel/security/tomoyo/ interface.
2247 *
2248 * Returns 0.
2249 */
2250 static int __init tomoyo_initerface_init(void)
2251 {
2252 struct dentry *tomoyo_dir;
2253
2254 /* Don't create securityfs entries unless registered. */
2255 if (current_cred()->security != &tomoyo_kernel_domain)
2256 return 0;
2257
2258 tomoyo_dir = securityfs_create_dir("tomoyo", NULL);
2259 tomoyo_create_entry("domain_policy", 0600, tomoyo_dir,
2260 TOMOYO_DOMAINPOLICY);
2261 tomoyo_create_entry("exception_policy", 0600, tomoyo_dir,
2262 TOMOYO_EXCEPTIONPOLICY);
2263 tomoyo_create_entry("self_domain", 0400, tomoyo_dir,
2264 TOMOYO_SELFDOMAIN);
2265 tomoyo_create_entry(".domain_status", 0600, tomoyo_dir,
2266 TOMOYO_DOMAIN_STATUS);
2267 tomoyo_create_entry(".process_status", 0600, tomoyo_dir,
2268 TOMOYO_PROCESS_STATUS);
2269 tomoyo_create_entry("meminfo", 0600, tomoyo_dir,
2270 TOMOYO_MEMINFO);
2271 tomoyo_create_entry("profile", 0600, tomoyo_dir,
2272 TOMOYO_PROFILE);
2273 tomoyo_create_entry("manager", 0600, tomoyo_dir,
2274 TOMOYO_MANAGER);
2275 tomoyo_create_entry("version", 0400, tomoyo_dir,
2276 TOMOYO_VERSION);
2277 return 0;
2278 }
2279
2280 fs_initcall(tomoyo_initerface_init);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree