aboutsummaryrefslogtreecommitdiff
path: root/security/tomoyo/common.h
blob: 521b4b5addaf0cb5ec2499d6005c148228272d24 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
/*
 * security/tomoyo/common.h
 *
 * Header file for TOMOYO.
 *
 * Copyright (C) 2005-2010  NTT DATA CORPORATION
 */

#ifndef _SECURITY_TOMOYO_COMMON_H
#define _SECURITY_TOMOYO_COMMON_H

#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/file.h>
#include <linux/kmod.h>
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/namei.h>
#include <linux/mount.h>
#include <linux/list.h>
#include <linux/cred.h>
struct linux_binprm;

/********** Constants definitions. **********/

/*
 * TOMOYO uses this hash only when appending a string into the string
 * table. Frequency of appending strings is very low. So we don't need
 * large (e.g. 64k) hash size. 256 will be sufficient.
 */
#define TOMOYO_HASH_BITS  8
#define TOMOYO_MAX_HASH (1u<<TOMOYO_HASH_BITS)

/*
 * This is the max length of a token.
 *
 * A token consists of only ASCII printable characters.
 * Non printable characters in a token is represented in \ooo style
 * octal string. Thus, \ itself is represented as \\.
 */
#define TOMOYO_MAX_PATHNAME_LEN 4000

/* Profile number is an integer between 0 and 255. */
#define TOMOYO_MAX_PROFILES 256

/* Keywords for ACLs. */
#define TOMOYO_KEYWORD_ALIAS                     "alias "
#define TOMOYO_KEYWORD_ALLOW_READ                "allow_read "
#define TOMOYO_KEYWORD_DELETE                    "delete "
#define TOMOYO_KEYWORD_DENY_REWRITE              "deny_rewrite "
#define TOMOYO_KEYWORD_FILE_PATTERN              "file_pattern "
#define TOMOYO_KEYWORD_INITIALIZE_DOMAIN         "initialize_domain "
#define TOMOYO_KEYWORD_KEEP_DOMAIN               "keep_domain "
#define TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN      "no_initialize_domain "
#define TOMOYO_KEYWORD_NO_KEEP_DOMAIN            "no_keep_domain "
#define TOMOYO_KEYWORD_SELECT                    "select "
#define TOMOYO_KEYWORD_USE_PROFILE               "use_profile "
#define TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ  "ignore_global_allow_read"
/* A domain definition starts with <kernel>. */
#define TOMOYO_ROOT_NAME                         "<kernel>"
#define TOMOYO_ROOT_NAME_LEN                     (sizeof(TOMOYO_ROOT_NAME) - 1)

/* Index numbers for Access Controls. */
#define TOMOYO_MAC_FOR_FILE                  0  /* domain_policy.conf */
#define TOMOYO_MAX_ACCEPT_ENTRY              1
#define TOMOYO_VERBOSE                       2
#define TOMOYO_MAX_CONTROL_INDEX             3

/* Index numbers for Access Controls. */

#define TOMOYO_TYPE_SINGLE_PATH_ACL                 0
#define TOMOYO_TYPE_DOUBLE_PATH_ACL                 1

/* Index numbers for File Controls. */

/*
 * TYPE_READ_WRITE_ACL is special. TYPE_READ_WRITE_ACL is automatically set
 * if both TYPE_READ_ACL and TYPE_WRITE_ACL are set. Both TYPE_READ_ACL and
 * TYPE_WRITE_ACL are automatically set if TYPE_READ_WRITE_ACL is set.
 * TYPE_READ_WRITE_ACL is automatically cleared if either TYPE_READ_ACL or
 * TYPE_WRITE_ACL is cleared. Both TYPE_READ_ACL and TYPE_WRITE_ACL are
 * automatically cleared if TYPE_READ_WRITE_ACL is cleared.
 */

#define TOMOYO_TYPE_READ_WRITE_ACL    0
#define TOMOYO_TYPE_EXECUTE_ACL       1
#define TOMOYO_TYPE_READ_ACL          2
#define TOMOYO_TYPE_WRITE_ACL         3
#define TOMOYO_TYPE_CREATE_ACL        4
#define TOMOYO_TYPE_UNLINK_ACL        5
#define TOMOYO_TYPE_MKDIR_ACL         6
#define TOMOYO_TYPE_RMDIR_ACL         7
#define TOMOYO_TYPE_MKFIFO_ACL        8
#define TOMOYO_TYPE_MKSOCK_ACL        9
#define TOMOYO_TYPE_MKBLOCK_ACL      10
#define TOMOYO_TYPE_MKCHAR_ACL       11
#define TOMOYO_TYPE_TRUNCATE_ACL     12
#define TOMOYO_TYPE_SYMLINK_ACL      13
#define TOMOYO_TYPE_REWRITE_ACL      14
#define TOMOYO_TYPE_IOCTL_ACL        15
#define TOMOYO_TYPE_CHMOD_ACL        16
#define TOMOYO_TYPE_CHOWN_ACL        17
#define TOMOYO_TYPE_CHGRP_ACL        18
#define TOMOYO_TYPE_CHROOT_ACL       19
#define TOMOYO_TYPE_MOUNT_ACL        20
#define TOMOYO_TYPE_UMOUNT_ACL       21
#define TOMOYO_MAX_SINGLE_PATH_OPERATION 22

#define TOMOYO_TYPE_LINK_ACL         0
#define TOMOYO_TYPE_RENAME_ACL       1
#define TOMOYO_TYPE_PIVOT_ROOT_ACL   2
#define TOMOYO_MAX_DOUBLE_PATH_OPERATION 3

#define TOMOYO_DOMAINPOLICY          0
#define TOMOYO_EXCEPTIONPOLICY       1
#define TOMOYO_DOMAIN_STATUS         2
#define TOMOYO_PROCESS_STATUS        3
#define TOMOYO_MEMINFO               4
#define TOMOYO_SELFDOMAIN            5
#define TOMOYO_VERSION               6
#define TOMOYO_PROFILE               7
#define TOMOYO_MANAGER               8

/********** Structure definitions. **********/

/*
 * tomoyo_page_buffer is a structure which is used for holding a pathname
 * obtained from "struct dentry" and "struct vfsmount" pair.
 * As of now, it is 4096 bytes. If users complain that 4096 bytes is too small
 * (because TOMOYO escapes non ASCII printable characters using \ooo format),
 * we will make the buffer larger.
 */
struct tomoyo_page_buffer {
	char buffer[4096];
};

/*
 * tomoyo_path_info is a structure which is used for holding a string data
 * used by TOMOYO.
 * This structure has several fields for supporting pattern matching.
 *
 * (1) "name" is the '\0' terminated string data.
 * (2) "hash" is full_name_hash(name, strlen(name)).
 *     This allows tomoyo_pathcmp() to compare by hash before actually compare
 *     using strcmp().
 * (3) "const_len" is the length of the initial segment of "name" which
 *     consists entirely of non wildcard characters. In other words, the length
 *     which we can compare two strings using strncmp().
 * (4) "is_dir" is a bool which is true if "name" ends with "/",
 *     false otherwise.
 *     TOMOYO distinguishes directory and non-directory. A directory ends with
 *     "/" and non-directory does not end with "/".
 * (5) "is_patterned" is a bool which is true if "name" contains wildcard
 *     characters, false otherwise. This allows TOMOYO to use "hash" and
 *     strcmp() for string comparison if "is_patterned" is false.
 */
struct tomoyo_path_info {
	const char *name;
	u32 hash;          /* = full_name_hash(name, strlen(name)) */
	u16 const_len;     /* = tomoyo_const_part_length(name)     */
	bool is_dir;       /* = tomoyo_strendswith(name, "/")      */
	bool is_patterned; /* = tomoyo_path_contains_pattern(name) */
};

/*
 * tomoyo_name_entry is a structure which is used for linking
 * "struct tomoyo_path_info" into tomoyo_name_list .
 */
struct tomoyo_name_entry {
	struct list_head list;
	atomic_t users;
	struct tomoyo_path_info entry;
};

/*
 * tomoyo_path_info_with_data is a structure which is used for holding a
 * pathname obtained from "struct dentry" and "struct vfsmount" pair.
 *
 * "struct tomoyo_path_info_with_data" consists of "struct tomoyo_path_info"
 * and buffer for the pathname, while "struct tomoyo_page_buffer" consists of
 * buffer for the pathname only.
 *
 * "struct tomoyo_path_info_with_data" is intended to allow TOMOYO to release
 * both "struct tomoyo_path_info" and buffer for the pathname by single kfree()
 * so that we don't need to return two pointers to the caller. If the caller
 * puts "struct tomoyo_path_info" on stack memory, we will be able to remove
 * "struct tomoyo_path_info_with_data".
 */
struct tomoyo_path_info_with_data {
	/* Keep "head" first, for this pointer is passed to kfree(). */
	struct tomoyo_path_info head;
	char barrier1[16]; /* Safeguard for overrun. */
	char body[TOMOYO_MAX_PATHNAME_LEN];
	char barrier2[16]; /* Safeguard for overrun. */
};

/*
 * tomoyo_acl_info is a structure which is used for holding
 *
 *  (1) "list" which is linked to the ->acl_info_list of
 *      "struct tomoyo_domain_info"
 *  (2) "type" which tells type of the entry (either
 *      "struct tomoyo_single_path_acl_record" or
 *      "struct tomoyo_double_path_acl_record").
 *
 * Packing "struct tomoyo_acl_info" allows
 * "struct tomoyo_single_path_acl_record" to embed "u8" + "u16" and
 * "struct tomoyo_double_path_acl_record" to embed "u8"
 * without enlarging their structure size.
 */
struct tomoyo_acl_info {
	struct list_head list;
	u8 type;
} __packed;

/*
 * tomoyo_domain_info is a structure which is used for holding permissions
 * (e.g. "allow_read /lib/libc-2.5.so") given to each domain.
 * It has following fields.
 *
 *  (1) "list" which is linked to tomoyo_domain_list .
 *  (2) "acl_info_list" which is linked to "struct tomoyo_acl_info".
 *  (3) "domainname" which holds the name of the domain.
 *  (4) "profile" which remembers profile number assigned to this domain.
 *  (5) "is_deleted" is a bool which is true if this domain is marked as
 *      "deleted", false otherwise.
 *  (6) "quota_warned" is a bool which is used for suppressing warning message
 *      when learning mode learned too much entries.
 *  (7) "ignore_global_allow_read" is a bool which is true if this domain
 *      should ignore "allow_read" directive in exception policy.
 *  (8) "transition_failed" is a bool which is set to true when this domain was
 *      unable to create a new domain at tomoyo_find_next_domain() because the
 *      name of the domain to be created was too long or it could not allocate
 *      memory. If set to true, more than one process continued execve()
 *      without domain transition.
 *  (9) "users" is an atomic_t that holds how many "struct cred"->security
 *      are referring this "struct tomoyo_domain_info". If is_deleted == true
 *      and users == 0, this struct will be kfree()d upon next garbage
 *      collection.
 *
 * A domain's lifecycle is an analogy of files on / directory.
 * Multiple domains with the same domainname cannot be created (as with
 * creating files with the same filename fails with -EEXIST).
 * If a process reached a domain, that process can reside in that domain after
 * that domain is marked as "deleted" (as with a process can access an already
 * open()ed file after that file was unlink()ed).
 */
struct tomoyo_domain_info {
	struct list_head list;
	struct list_head acl_info_list;
	/* Name of this domain. Never NULL.          */
	const struct tomoyo_path_info *domainname;
	u8 profile;        /* Profile number to use. */
	bool is_deleted;   /* Delete flag.           */
	bool quota_warned; /* Quota warnning flag.   */
	bool ignore_global_allow_read; /* Ignore "allow_read" flag. */
	bool transition_failed; /* Domain transition failed flag. */
	atomic_t users; /* Number of referring credentials. */
};

/*
 * tomoyo_single_path_acl_record is a structure which is used for holding an
 * entry with one pathname operation (e.g. open(), mkdir()).
 * It has following fields.
 *
 *  (1) "head" which is a "struct tomoyo_acl_info".
 *  (2) "perm" which is a bitmask of permitted operations.
 *  (3) "filename" is the pathname.
 *
 * Directives held by this structure are "allow_read/write", "allow_execute",
 * "allow_read", "allow_write", "allow_create", "allow_unlink", "allow_mkdir",
 * "allow_rmdir", "allow_mkfifo", "allow_mksock", "allow_mkblock",
 * "allow_mkchar", "allow_truncate", "allow_symlink", "allow_rewrite",
 * "allow_chmod", "allow_chown", "allow_chgrp", "allow_chroot", "allow_mount"
 * and "allow_unmount".
 */
struct tomoyo_single_path_acl_record {
	struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_SINGLE_PATH_ACL */
	u8 perm_high;
	u16 perm;
	/* Pointer to single pathname. */
	const struct tomoyo_path_info *filename;
};

/*
 * tomoyo_double_path_acl_record is a structure which is used for holding an
 * entry with two pathnames operation (i.e. link(), rename() and pivot_root()).
 * It has following fields.
 *
 *  (1) "head" which is a "struct tomoyo_acl_info".
 *  (2) "perm" which is a bitmask of permitted operations.
 *  (3) "filename1" is the source/old pathname.
 *  (4) "filename2" is the destination/new pathname.
 *
 * Directives held by this structure are "allow_rename", "allow_link" and
 * "allow_pivot_root".
 */
struct tomoyo_double_path_acl_record {
	struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_DOUBLE_PATH_ACL */
	u8 perm;
	/* Pointer to single pathname. */
	const struct tomoyo_path_info *filename1;
	/* Pointer to single pathname. */
	const struct tomoyo_path_info *filename2;
};

/*
 * tomoyo_io_buffer is a structure which is used for reading and modifying
 * configuration via /sys/kernel/security/tomoyo/ interface.
 * It has many fields. ->read_var1 , ->read_var2 , ->write_var1 are used as
 * cursors.
 *
 * Since the content of /sys/kernel/security/tomoyo/domain_policy is a list of
 * "struct tomoyo_domain_info" entries and each "struct tomoyo_domain_info"
 * entry has a list of "struct tomoyo_acl_info", we need two cursors when
 * reading (one is for traversing tomoyo_domain_list and the other is for
 * traversing "struct tomoyo_acl_info"->acl_info_list ).
 *
 * If a line written to /sys/kernel/security/tomoyo/domain_policy starts with
 * "select ", TOMOYO seeks the cursor ->read_var1 and ->write_var1 to the
 * domain with the domainname specified by the rest of that line (NULL is set
 * if seek failed).
 * If a line written to /sys/kernel/security/tomoyo/domain_policy starts with
 * "delete ", TOMOYO deletes an entry or a domain specified by the rest of that
 * line (->write_var1 is set to NULL if a domain was deleted).
 * If a line written to /sys/kernel/security/tomoyo/domain_policy starts with
 * neither "select " nor "delete ", an entry or a domain specified by that line
 * is appended.
 */
struct tomoyo_io_buffer {
	int (*read) (struct tomoyo_io_buffer *);
	int (*write) (struct tomoyo_io_buffer *);
	/* Exclusive lock for this structure.   */
	struct mutex io_sem;
	/* Index returned by tomoyo_read_lock(). */
	int reader_idx;
	/* The position currently reading from. */
	struct list_head *read_var1;
	/* Extra variables for reading.         */
	struct list_head *read_var2;
	/* The position currently writing to.   */
	struct tomoyo_domain_info *write_var1;
	/* The step for reading.                */
	int read_step;
	/* Buffer for reading.                  */
	char *read_buf;
	/* EOF flag for reading.                */
	bool read_eof;
	/* Read domain ACL of specified PID?    */
	bool read_single_domain;
	/* Extra variable for reading.          */
	u8 read_bit;
	/* Bytes available for reading.         */
	int read_avail;
	/* Size of read buffer.                 */
	int readbuf_size;
	/* Buffer for writing.                  */
	char *write_buf;
	/* Bytes available for writing.         */
	int write_avail;
	/* Size of write buffer.                */
	int writebuf_size;
};

/*
 * tomoyo_globally_readable_file_entry is a structure which is used for holding
 * "allow_read" entries.
 * It has following fields.
 *
 *  (1) "list" which is linked to tomoyo_globally_readable_list .
 *  (2) "filename" is a pathname which is allowed to open(O_RDONLY).
 *  (3) "is_deleted" is a bool which is true if marked as deleted, false
 *      otherwise.
 */
struct tomoyo_globally_readable_file_entry {
	struct list_head list;
	const struct tomoyo_path_info *filename;
	bool is_deleted;
};

/*
 * tomoyo_pattern_entry is a structure which is used for holding
 * "tomoyo_pattern_list" entries.
 * It has following fields.
 *
 *  (1) "list" which is linked to tomoyo_pattern_list .
 *  (2) "pattern" is a pathname pattern which is used for converting pathnames
 *      to pathname patterns during learning mode.
 *  (3) "is_deleted" is a bool which is true if marked as deleted, false
 *      otherwise.
 */
struct tomoyo_pattern_entry {
	struct list_head list;
	const struct tomoyo_path_info *pattern;
	bool is_deleted;
};

/*
 * tomoyo_no_rewrite_entry is a structure which is used for holding
 * "deny_rewrite" entries.
 * It has following fields.
 *
 *  (1) "list" which is linked to tomoyo_no_rewrite_list .
 *  (2) "pattern" is a pathname which is by default not permitted to modify
 *      already existing content.
 *  (3) "is_deleted" is a bool which is true if marked as deleted, false
 *      otherwise.
 */
struct tomoyo_no_rewrite_entry {
	struct list_head list;
	const struct tomoyo_path_info *pattern;
	bool is_deleted;
};

/*
 * tomoyo_domain_initializer_entry is a structure which is used for holding
 * "initialize_domain" and "no_initialize_domain" entries.
 * It has following fields.
 *
 *  (1) "list" which is linked to tomoyo_domain_initializer_list .
 *  (2) "domainname" which is "a domainname" or "the last component of a
 *      domainname". This field is NULL if "from" clause is not specified.
 *  (3) "program" which is a program's pathname.
 *  (4) "is_deleted" is a bool which is true if marked as deleted, false
 *      otherwise.
 *  (5) "is_not" is a bool which is true if "no_initialize_domain", false
 *      otherwise.
 *  (6) "is_last_name" is a bool which is true if "domainname" is "the last
 *      component of a domainname", false otherwise.
 */
struct tomoyo_domain_initializer_entry {
	struct list_head list;
	const struct tomoyo_path_info *domainname;    /* This may be NULL */
	const struct tomoyo_path_info *program;
	bool is_deleted;
	bool is_not;       /* True if this entry is "no_initialize_domain".  */
	/* True if the domainname is tomoyo_get_last_name(). */
	bool is_last_name;
};

/*
 * tomoyo_domain_keeper_entry is a structure which is used for holding
 * "keep_domain" and "no_keep_domain" entries.
 * It has following fields.
 *
 *  (1) "list" which is linked to tomoyo_domain_keeper_list .
 *  (2) "domainname" which is "a domainname" or "the last component of a
 *      domainname".
 *  (3) "program" which is a program's pathname.
 *      This field is NULL if "from" clause is not specified.
 *  (4) "is_deleted" is a bool which is true if marked as deleted, false
 *      otherwise.
 *  (5) "is_not" is a bool which is true if "no_initialize_domain", false
 *      otherwise.
 *  (6) "is_last_name" is a bool which is true if "domainname" is "the last
 *      component of a domainname", false otherwise.
 */
struct tomoyo_domain_keeper_entry {
	struct list_head list;
	const struct tomoyo_path_info *domainname;
	const struct tomoyo_path_info *program;       /* This may be NULL */
	bool is_deleted;
	bool is_not;       /* True if this entry is "no_keep_domain".        */
	/* True if the domainname is tomoyo_get_last_name(). */
	bool is_last_name;
};

/*
 * tomoyo_alias_entry is a structure which is used for holding "alias" entries.
 * It has following fields.
 *
 *  (1) "list" which is linked to tomoyo_alias_list .
 *  (2) "original_name" which is a dereferenced pathname.
 *  (3) "aliased_name" which is a symlink's pathname.
 *  (4) "is_deleted" is a bool which is true if marked as deleted, false
 *      otherwise.
 */
struct tomoyo_alias_entry {
	struct list_head list;
	const struct tomoyo_path_info *original_name;
	const struct tomoyo_path_info *aliased_name;
	bool is_deleted;
};

/*
 * tomoyo_policy_manager_entry is a structure which is used for holding list of
 * domainnames or programs which are permitted to modify configuration via
 * /sys/kernel/security/tomoyo/ interface.
 * It has following fields.
 *
 *  (1) "list" which is linked to tomoyo_policy_manager_list .
 *  (2) "manager" is a domainname or a program's pathname.
 *  (3) "is_domain" is a bool which is true if "manager" is a domainname, false
 *      otherwise.
 *  (4) "is_deleted" is a bool which is true if marked as deleted, false
 *      otherwise.
 */
struct tomoyo_policy_manager_entry {
	struct list_head list;
	/* A path to program or a domainname. */
	const struct tomoyo_path_info *manager;
	bool is_domain;  /* True if manager is a domainname. */
	bool is_deleted; /* True if this entry is deleted. */
};

/********** Function prototypes. **********/

/* Check whether the domain has too many ACL entries to hold. */
bool tomoyo_domain_quota_is_ok(struct tomoyo_domain_info * const domain);
/* Transactional sprintf() for policy dump. */
bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
	__attribute__ ((format(printf, 2, 3)));
/* Check whether the domainname is correct. */
bool tomoyo_is_correct_domain(const unsigned char *domainname,
			      const char *function);
/* Check whether the token is correct. */
bool tomoyo_is_correct_path(const char *filename, const s8 start_type,
			    const s8 pattern_type, const s8 end_type,
			    const char *function);
/* Check whether the token can be a domainname. */
bool tomoyo_is_domain_def(const unsigned char *buffer);
/* Check whether the given filename matches the given pattern. */
bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename,
				 const struct tomoyo_path_info *pattern);
/* Read "alias" entry in exception policy. */
bool tomoyo_read_alias_policy(struct tomoyo_io_buffer *head);
/*
 * Read "initialize_domain" and "no_initialize_domain" entry
 * in exception policy.
 */
bool tomoyo_read_domain_initializer_policy(struct tomoyo_io_buffer *head);
/* Read "keep_domain" and "no_keep_domain" entry in exception policy. */
bool tomoyo_read_domain_keeper_policy(struct tomoyo_io_buffer *head);
/* Read "file_pattern" entry in exception policy. */
bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head);
/* Read "allow_read" entry in exception policy. */
bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head);
/* Read "deny_rewrite" entry in exception policy. */
bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head);
/* Write domain policy violation warning message to console? */
bool tomoyo_verbose_mode(const struct tomoyo_domain_info *domain);
/* Convert double path operation to operation name. */
const char *tomoyo_dp2keyword(const u8 operation);
/* Get the last component of the given domainname. */
const char *tomoyo_get_last_name(const struct tomoyo_domain_info *domain);
/* Get warning message. */
const char *tomoyo_get_msg(const bool is_enforce);
/* Convert single path operation to operation name. */
const char *tomoyo_sp2keyword(const u8 operation);
/* Create "alias" entry in exception policy. */
int tomoyo_write_alias_policy(char *data, const bool is_delete);
/*
 * Create "initialize_domain" and "no_initialize_domain" entry
 * in exception policy.
 */
int tomoyo_write_domain_initializer_policy(char *data, const bool is_not,
					   const bool is_delete);
/* Create "keep_domain" and "no_keep_domain" entry in exception policy. */
int tomoyo_write_domain_keeper_policy(char *data, const bool is_not,
				      const bool is_delete);
/*
 * Create "allow_read/write", "allow_execute", "allow_read", "allow_write",
 * "allow_create", "allow_unlink", "allow_mkdir", "allow_rmdir",
 * "allow_mkfifo", "allow_mksock", "allow_mkblock", "allow_mkchar",
 * "allow_truncate", "allow_symlink", "allow_rewrite", "allow_rename" and
 * "allow_link" entry in domain policy.
 */
int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain,
			     const bool is_delete);
/* Create "allow_read" entry in exception policy. */
int tomoyo_write_globally_readable_policy(char *data, const bool is_delete);
/* Create "deny_rewrite" entry in exception policy. */
int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete);
/* Create "file_pattern" entry in exception policy. */
int tomoyo_write_pattern_policy(char *data, const bool is_delete);
/* Find a domain by the given name. */
struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname);
/* Find or create a domain by the given name. */
struct tomoyo_domain_info *tomoyo_find_or_assign_new_domain(const char *
							    domainname,
							    const u8 profile);
/* Check mode for specified functionality. */
unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain,
				const u8 index);
/* Fill in "struct tomoyo_path_info" members. */
void tomoyo_fill_path_info(struct tomoyo_path_info *ptr);
/* Run policy loader when /sbin/init starts. */
void tomoyo_load_policy(const char *filename);

/* Convert binary string to ascii string. */
int tomoyo_encode(char *buffer, int buflen, const char *str);

/* Returns realpath(3) of the given pathname but ignores chroot'ed root. */
int tomoyo_realpath_from_path2(struct path *path, char *newname,
			       int newname_len);

/*
 * Returns realpath(3) of the given pathname but ignores chroot'ed root.
 * These functions use kzalloc(), so the caller must call kfree()
 * if these functions didn't return NULL.
 */
char *tomoyo_realpath(const char *pathname);
/*
 * Same with tomoyo_realpath() except that it doesn't follow the final symlink.
 */
char *tomoyo_realpath_nofollow(const char *pathname);
/* Same with tomoyo_realpath() except that the pathname is already solved. */
char *tomoyo_realpath_from_path(struct path *path);

/* Check memory quota. */
bool tomoyo_memory_ok(void *ptr);

/*
 * Keep the given name on the RAM.
 * The RAM is shared, so NEVER try to modify or kfree() the returned name.
 */
const struct tomoyo_path_info *tomoyo_get_name(const char *name);

/* Check for memory usage. */
int tomoyo_read_memory_counter(struct tomoyo_io_buffer *head);

/* Set memory quota. */
int tomoyo_write_memory_quota(struct tomoyo_io_buffer *head);

/* Initialize realpath related code. */
void __init tomoyo_realpath_init(void);
int tomoyo_check_exec_perm(struct tomoyo_domain_info *domain,
			   const struct tomoyo_path_info *filename);
int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
				 struct path *path, const int flag);
int tomoyo_check_1path_perm(struct tomoyo_domain_info *domain,
			    const u8 operation, struct path *path);
int tomoyo_check_2path_perm(struct tomoyo_domain_info *domain,
			    const u8 operation, struct path *path1,
			    struct path *path2);
int tomoyo_check_rewrite_permission(struct tomoyo_domain_info *domain,
				    struct file *filp);
int tomoyo_find_next_domain(struct linux_binprm *bprm);

/********** External variable definitions. **********/

/* Lock for GC. */
extern struct srcu_struct tomoyo_ss;

/* The list for "struct tomoyo_domain_info". */
extern struct list_head tomoyo_domain_list;

/* Lock for protecting policy. */
extern struct mutex tomoyo_policy_lock;

/* Has /sbin/init started? */
extern bool tomoyo_policy_loaded;

/* The kernel's domain. */
extern struct tomoyo_domain_info tomoyo_kernel_domain;

/********** Inlined functions. **********/

static inline int tomoyo_read_lock(void)
{
	return srcu_read_lock(&tomoyo_ss);
}

static inline void tomoyo_read_unlock(int idx)
{
	srcu_read_unlock(&tomoyo_ss, idx);
}

/* strcmp() for "struct tomoyo_path_info" structure. */
static inline bool tomoyo_pathcmp(const struct tomoyo_path_info *a,
				  const struct tomoyo_path_info *b)
{
	return a->hash != b->hash || strcmp(a->name, b->name);
}

/**
 * tomoyo_is_valid - Check whether the character is a valid char.
 *
 * @c: The character to check.
 *
 * Returns true if @c is a valid character, false otherwise.
 */
static inline bool tomoyo_is_valid(const unsigned char c)
{
	return c > ' ' && c < 127;
}

/**
 * tomoyo_is_invalid - Check whether the character is an invalid char.
 *
 * @c: The character to check.
 *
 * Returns true if @c is an invalid character, false otherwise.
 */
static inline bool tomoyo_is_invalid(const unsigned char c)
{
	return c && (c <= ' ' || c >= 127);
}

static inline void tomoyo_put_name(const struct tomoyo_path_info *name)
{
	if (name) {
		struct tomoyo_name_entry *ptr =
			container_of(name, struct tomoyo_name_entry, entry);
		atomic_dec(&ptr->users);
	}
}

static inline struct tomoyo_domain_info *tomoyo_domain(void)
{
	return current_cred()->security;
}

static inline struct tomoyo_domain_info *tomoyo_real_domain(struct task_struct
							    *task)
{
	return task_cred_xxx(task, security);
}

/**
 * list_for_each_cookie - iterate over a list with cookie.
 * @pos:        the &struct list_head to use as a loop cursor.
 * @cookie:     the &struct list_head to use as a cookie.
 * @head:       the head for your list.
 *
 * Same with list_for_each_rcu() except that this primitive uses @cookie
 * so that we can continue iteration.
 * @cookie must be NULL when iteration starts, and @cookie will become
 * NULL when iteration finishes.
 */
#define list_for_each_cookie(pos, cookie, head)				\
	for (({ if (!cookie)						\
				     cookie = head; }),			\
		     pos = rcu_dereference((cookie)->next);		\
	     prefetch(pos->next), pos != (head) || ((cookie) = NULL);	\
	     (cookie) = pos, pos = rcu_dereference(pos->next))

#endif /* !defined(_SECURITY_TOMOYO_COMMON_H) */