2 * security/tomoyo/common.h
4 * Header file for TOMOYO.
6 * Copyright (C) 2005-2010 NTT DATA CORPORATION
9 #ifndef _SECURITY_TOMOYO_COMMON_H
10 #define _SECURITY_TOMOYO_COMMON_H
12 #include <linux/ctype.h>
13 #include <linux/string.h>
15 #include <linux/file.h>
16 #include <linux/kmod.h>
18 #include <linux/sched.h>
19 #include <linux/namei.h>
20 #include <linux/mount.h>
21 #include <linux/list.h>
22 #include <linux/cred.h>
25 /********** Constants definitions. **********/
28 * TOMOYO uses this hash only when appending a string into the string
29 * table. Frequency of appending strings is very low. So we don't need
30 * large (e.g. 64k) hash size. 256 will be sufficient.
32 #define TOMOYO_HASH_BITS 8
33 #define TOMOYO_MAX_HASH (1u<<TOMOYO_HASH_BITS)
36 * This is the max length of a token.
38 * A token consists of only ASCII printable characters.
39 * Non printable characters in a token is represented in \ooo style
40 * octal string. Thus, \ itself is represented as \\.
42 #define TOMOYO_MAX_PATHNAME_LEN 4000
44 /* Profile number is an integer between 0 and 255. */
45 #define TOMOYO_MAX_PROFILES 256
47 /* Keywords for ACLs. */
48 #define TOMOYO_KEYWORD_ALIAS "alias "
49 #define TOMOYO_KEYWORD_ALLOW_READ "allow_read "
50 #define TOMOYO_KEYWORD_DELETE "delete "
51 #define TOMOYO_KEYWORD_DENY_REWRITE "deny_rewrite "
52 #define TOMOYO_KEYWORD_FILE_PATTERN "file_pattern "
53 #define TOMOYO_KEYWORD_INITIALIZE_DOMAIN "initialize_domain "
54 #define TOMOYO_KEYWORD_KEEP_DOMAIN "keep_domain "
55 #define TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN "no_initialize_domain "
56 #define TOMOYO_KEYWORD_NO_KEEP_DOMAIN "no_keep_domain "
57 #define TOMOYO_KEYWORD_SELECT "select "
58 #define TOMOYO_KEYWORD_USE_PROFILE "use_profile "
59 #define TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "ignore_global_allow_read"
60 /* A domain definition starts with <kernel>. */
61 #define TOMOYO_ROOT_NAME "<kernel>"
62 #define TOMOYO_ROOT_NAME_LEN (sizeof(TOMOYO_ROOT_NAME) - 1)
64 /* Index numbers for Access Controls. */
65 enum tomoyo_mac_index {
66 TOMOYO_MAC_FOR_FILE, /* domain_policy.conf */
67 TOMOYO_MAX_ACCEPT_ENTRY,
69 TOMOYO_MAX_CONTROL_INDEX
72 /* Index numbers for Access Controls. */
73 enum tomoyo_acl_entry_type_index {
74 TOMOYO_TYPE_SINGLE_PATH_ACL,
75 TOMOYO_TYPE_DOUBLE_PATH_ACL,
78 /* Index numbers for File Controls. */
81 * TYPE_READ_WRITE_ACL is special. TYPE_READ_WRITE_ACL is automatically set
82 * if both TYPE_READ_ACL and TYPE_WRITE_ACL are set. Both TYPE_READ_ACL and
83 * TYPE_WRITE_ACL are automatically set if TYPE_READ_WRITE_ACL is set.
84 * TYPE_READ_WRITE_ACL is automatically cleared if either TYPE_READ_ACL or
85 * TYPE_WRITE_ACL is cleared. Both TYPE_READ_ACL and TYPE_WRITE_ACL are
86 * automatically cleared if TYPE_READ_WRITE_ACL is cleared.
89 enum tomoyo_path_acl_index {
90 TOMOYO_TYPE_READ_WRITE_ACL,
91 TOMOYO_TYPE_EXECUTE_ACL,
93 TOMOYO_TYPE_WRITE_ACL,
94 TOMOYO_TYPE_CREATE_ACL,
95 TOMOYO_TYPE_UNLINK_ACL,
96 TOMOYO_TYPE_MKDIR_ACL,
97 TOMOYO_TYPE_RMDIR_ACL,
98 TOMOYO_TYPE_MKFIFO_ACL,
99 TOMOYO_TYPE_MKSOCK_ACL,
100 TOMOYO_TYPE_MKBLOCK_ACL,
101 TOMOYO_TYPE_MKCHAR_ACL,
102 TOMOYO_TYPE_TRUNCATE_ACL,
103 TOMOYO_TYPE_SYMLINK_ACL,
104 TOMOYO_TYPE_REWRITE_ACL,
105 TOMOYO_TYPE_IOCTL_ACL,
106 TOMOYO_TYPE_CHMOD_ACL,
107 TOMOYO_TYPE_CHOWN_ACL,
108 TOMOYO_TYPE_CHGRP_ACL,
109 TOMOYO_TYPE_CHROOT_ACL,
110 TOMOYO_TYPE_MOUNT_ACL,
111 TOMOYO_TYPE_UMOUNT_ACL,
112 TOMOYO_MAX_SINGLE_PATH_OPERATION
115 enum tomoyo_path2_acl_index {
116 TOMOYO_TYPE_LINK_ACL,
117 TOMOYO_TYPE_RENAME_ACL,
118 TOMOYO_TYPE_PIVOT_ROOT_ACL,
119 TOMOYO_MAX_DOUBLE_PATH_OPERATION
122 enum tomoyo_securityfs_interface_index {
124 TOMOYO_EXCEPTIONPOLICY,
125 TOMOYO_DOMAIN_STATUS,
126 TOMOYO_PROCESS_STATUS,
134 /********** Structure definitions. **********/
137 * tomoyo_page_buffer is a structure which is used for holding a pathname
138 * obtained from "struct dentry" and "struct vfsmount" pair.
139 * As of now, it is 4096 bytes. If users complain that 4096 bytes is too small
140 * (because TOMOYO escapes non ASCII printable characters using \ooo format),
141 * we will make the buffer larger.
143 struct tomoyo_page_buffer {
148 * tomoyo_path_info is a structure which is used for holding a string data
150 * This structure has several fields for supporting pattern matching.
152 * (1) "name" is the '\0' terminated string data.
153 * (2) "hash" is full_name_hash(name, strlen(name)).
154 * This allows tomoyo_pathcmp() to compare by hash before actually compare
156 * (3) "const_len" is the length of the initial segment of "name" which
157 * consists entirely of non wildcard characters. In other words, the length
158 * which we can compare two strings using strncmp().
159 * (4) "is_dir" is a bool which is true if "name" ends with "/",
161 * TOMOYO distinguishes directory and non-directory. A directory ends with
162 * "/" and non-directory does not end with "/".
163 * (5) "is_patterned" is a bool which is true if "name" contains wildcard
164 * characters, false otherwise. This allows TOMOYO to use "hash" and
165 * strcmp() for string comparison if "is_patterned" is false.
167 struct tomoyo_path_info {
169 u32 hash; /* = full_name_hash(name, strlen(name)) */
170 u16 const_len; /* = tomoyo_const_part_length(name) */
171 bool is_dir; /* = tomoyo_strendswith(name, "/") */
172 bool is_patterned; /* = tomoyo_path_contains_pattern(name) */
176 * tomoyo_name_entry is a structure which is used for linking
177 * "struct tomoyo_path_info" into tomoyo_name_list .
179 struct tomoyo_name_entry {
180 struct list_head list;
182 struct tomoyo_path_info entry;
186 * tomoyo_path_info_with_data is a structure which is used for holding a
187 * pathname obtained from "struct dentry" and "struct vfsmount" pair.
189 * "struct tomoyo_path_info_with_data" consists of "struct tomoyo_path_info"
190 * and buffer for the pathname, while "struct tomoyo_page_buffer" consists of
191 * buffer for the pathname only.
193 * "struct tomoyo_path_info_with_data" is intended to allow TOMOYO to release
194 * both "struct tomoyo_path_info" and buffer for the pathname by single kfree()
195 * so that we don't need to return two pointers to the caller. If the caller
196 * puts "struct tomoyo_path_info" on stack memory, we will be able to remove
197 * "struct tomoyo_path_info_with_data".
199 struct tomoyo_path_info_with_data {
200 /* Keep "head" first, for this pointer is passed to kfree(). */
201 struct tomoyo_path_info head;
202 char barrier1[16]; /* Safeguard for overrun. */
203 char body[TOMOYO_MAX_PATHNAME_LEN];
204 char barrier2[16]; /* Safeguard for overrun. */
208 * tomoyo_acl_info is a structure which is used for holding
210 * (1) "list" which is linked to the ->acl_info_list of
211 * "struct tomoyo_domain_info"
212 * (2) "type" which tells type of the entry (either
213 * "struct tomoyo_single_path_acl_record" or
214 * "struct tomoyo_double_path_acl_record").
216 * Packing "struct tomoyo_acl_info" allows
217 * "struct tomoyo_single_path_acl_record" to embed "u8" + "u16" and
218 * "struct tomoyo_double_path_acl_record" to embed "u8"
219 * without enlarging their structure size.
221 struct tomoyo_acl_info {
222 struct list_head list;
227 * tomoyo_domain_info is a structure which is used for holding permissions
228 * (e.g. "allow_read /lib/libc-2.5.so") given to each domain.
229 * It has following fields.
231 * (1) "list" which is linked to tomoyo_domain_list .
232 * (2) "acl_info_list" which is linked to "struct tomoyo_acl_info".
233 * (3) "domainname" which holds the name of the domain.
234 * (4) "profile" which remembers profile number assigned to this domain.
235 * (5) "is_deleted" is a bool which is true if this domain is marked as
236 * "deleted", false otherwise.
237 * (6) "quota_warned" is a bool which is used for suppressing warning message
238 * when learning mode learned too much entries.
239 * (7) "ignore_global_allow_read" is a bool which is true if this domain
240 * should ignore "allow_read" directive in exception policy.
241 * (8) "transition_failed" is a bool which is set to true when this domain was
242 * unable to create a new domain at tomoyo_find_next_domain() because the
243 * name of the domain to be created was too long or it could not allocate
244 * memory. If set to true, more than one process continued execve()
245 * without domain transition.
246 * (9) "users" is an atomic_t that holds how many "struct cred"->security
247 * are referring this "struct tomoyo_domain_info". If is_deleted == true
248 * and users == 0, this struct will be kfree()d upon next garbage
251 * A domain's lifecycle is an analogy of files on / directory.
252 * Multiple domains with the same domainname cannot be created (as with
253 * creating files with the same filename fails with -EEXIST).
254 * If a process reached a domain, that process can reside in that domain after
255 * that domain is marked as "deleted" (as with a process can access an already
256 * open()ed file after that file was unlink()ed).
258 struct tomoyo_domain_info {
259 struct list_head list;
260 struct list_head acl_info_list;
261 /* Name of this domain. Never NULL. */
262 const struct tomoyo_path_info *domainname;
263 u8 profile; /* Profile number to use. */
264 bool is_deleted; /* Delete flag. */
265 bool quota_warned; /* Quota warnning flag. */
266 bool ignore_global_allow_read; /* Ignore "allow_read" flag. */
267 bool transition_failed; /* Domain transition failed flag. */
268 atomic_t users; /* Number of referring credentials. */
272 * tomoyo_single_path_acl_record is a structure which is used for holding an
273 * entry with one pathname operation (e.g. open(), mkdir()).
274 * It has following fields.
276 * (1) "head" which is a "struct tomoyo_acl_info".
277 * (2) "perm" which is a bitmask of permitted operations.
278 * (3) "filename" is the pathname.
280 * Directives held by this structure are "allow_read/write", "allow_execute",
281 * "allow_read", "allow_write", "allow_create", "allow_unlink", "allow_mkdir",
282 * "allow_rmdir", "allow_mkfifo", "allow_mksock", "allow_mkblock",
283 * "allow_mkchar", "allow_truncate", "allow_symlink", "allow_rewrite",
284 * "allow_chmod", "allow_chown", "allow_chgrp", "allow_chroot", "allow_mount"
285 * and "allow_unmount".
287 struct tomoyo_single_path_acl_record {
288 struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_SINGLE_PATH_ACL */
291 /* Pointer to single pathname. */
292 const struct tomoyo_path_info *filename;
296 * tomoyo_double_path_acl_record is a structure which is used for holding an
297 * entry with two pathnames operation (i.e. link(), rename() and pivot_root()).
298 * It has following fields.
300 * (1) "head" which is a "struct tomoyo_acl_info".
301 * (2) "perm" which is a bitmask of permitted operations.
302 * (3) "filename1" is the source/old pathname.
303 * (4) "filename2" is the destination/new pathname.
305 * Directives held by this structure are "allow_rename", "allow_link" and
306 * "allow_pivot_root".
308 struct tomoyo_double_path_acl_record {
309 struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_DOUBLE_PATH_ACL */
311 /* Pointer to single pathname. */
312 const struct tomoyo_path_info *filename1;
313 /* Pointer to single pathname. */
314 const struct tomoyo_path_info *filename2;
318 * tomoyo_io_buffer is a structure which is used for reading and modifying
319 * configuration via /sys/kernel/security/tomoyo/ interface.
320 * It has many fields. ->read_var1 , ->read_var2 , ->write_var1 are used as
323 * Since the content of /sys/kernel/security/tomoyo/domain_policy is a list of
324 * "struct tomoyo_domain_info" entries and each "struct tomoyo_domain_info"
325 * entry has a list of "struct tomoyo_acl_info", we need two cursors when
326 * reading (one is for traversing tomoyo_domain_list and the other is for
327 * traversing "struct tomoyo_acl_info"->acl_info_list ).
329 * If a line written to /sys/kernel/security/tomoyo/domain_policy starts with
330 * "select ", TOMOYO seeks the cursor ->read_var1 and ->write_var1 to the
331 * domain with the domainname specified by the rest of that line (NULL is set
333 * If a line written to /sys/kernel/security/tomoyo/domain_policy starts with
334 * "delete ", TOMOYO deletes an entry or a domain specified by the rest of that
335 * line (->write_var1 is set to NULL if a domain was deleted).
336 * If a line written to /sys/kernel/security/tomoyo/domain_policy starts with
337 * neither "select " nor "delete ", an entry or a domain specified by that line
340 struct tomoyo_io_buffer {
341 int (*read) (struct tomoyo_io_buffer *);
342 int (*write) (struct tomoyo_io_buffer *);
343 /* Exclusive lock for this structure. */
345 /* Index returned by tomoyo_read_lock(). */
347 /* The position currently reading from. */
348 struct list_head *read_var1;
349 /* Extra variables for reading. */
350 struct list_head *read_var2;
351 /* The position currently writing to. */
352 struct tomoyo_domain_info *write_var1;
353 /* The step for reading. */
355 /* Buffer for reading. */
357 /* EOF flag for reading. */
359 /* Read domain ACL of specified PID? */
360 bool read_single_domain;
361 /* Extra variable for reading. */
363 /* Bytes available for reading. */
365 /* Size of read buffer. */
367 /* Buffer for writing. */
369 /* Bytes available for writing. */
371 /* Size of write buffer. */
376 * tomoyo_globally_readable_file_entry is a structure which is used for holding
377 * "allow_read" entries.
378 * It has following fields.
380 * (1) "list" which is linked to tomoyo_globally_readable_list .
381 * (2) "filename" is a pathname which is allowed to open(O_RDONLY).
382 * (3) "is_deleted" is a bool which is true if marked as deleted, false
385 struct tomoyo_globally_readable_file_entry {
386 struct list_head list;
387 const struct tomoyo_path_info *filename;
392 * tomoyo_pattern_entry is a structure which is used for holding
393 * "tomoyo_pattern_list" entries.
394 * It has following fields.
396 * (1) "list" which is linked to tomoyo_pattern_list .
397 * (2) "pattern" is a pathname pattern which is used for converting pathnames
398 * to pathname patterns during learning mode.
399 * (3) "is_deleted" is a bool which is true if marked as deleted, false
402 struct tomoyo_pattern_entry {
403 struct list_head list;
404 const struct tomoyo_path_info *pattern;
409 * tomoyo_no_rewrite_entry is a structure which is used for holding
410 * "deny_rewrite" entries.
411 * It has following fields.
413 * (1) "list" which is linked to tomoyo_no_rewrite_list .
414 * (2) "pattern" is a pathname which is by default not permitted to modify
415 * already existing content.
416 * (3) "is_deleted" is a bool which is true if marked as deleted, false
419 struct tomoyo_no_rewrite_entry {
420 struct list_head list;
421 const struct tomoyo_path_info *pattern;
426 * tomoyo_domain_initializer_entry is a structure which is used for holding
427 * "initialize_domain" and "no_initialize_domain" entries.
428 * It has following fields.
430 * (1) "list" which is linked to tomoyo_domain_initializer_list .
431 * (2) "domainname" which is "a domainname" or "the last component of a
432 * domainname". This field is NULL if "from" clause is not specified.
433 * (3) "program" which is a program's pathname.
434 * (4) "is_deleted" is a bool which is true if marked as deleted, false
436 * (5) "is_not" is a bool which is true if "no_initialize_domain", false
438 * (6) "is_last_name" is a bool which is true if "domainname" is "the last
439 * component of a domainname", false otherwise.
441 struct tomoyo_domain_initializer_entry {
442 struct list_head list;
443 const struct tomoyo_path_info *domainname; /* This may be NULL */
444 const struct tomoyo_path_info *program;
446 bool is_not; /* True if this entry is "no_initialize_domain". */
447 /* True if the domainname is tomoyo_get_last_name(). */
452 * tomoyo_domain_keeper_entry is a structure which is used for holding
453 * "keep_domain" and "no_keep_domain" entries.
454 * It has following fields.
456 * (1) "list" which is linked to tomoyo_domain_keeper_list .
457 * (2) "domainname" which is "a domainname" or "the last component of a
459 * (3) "program" which is a program's pathname.
460 * This field is NULL if "from" clause is not specified.
461 * (4) "is_deleted" is a bool which is true if marked as deleted, false
463 * (5) "is_not" is a bool which is true if "no_initialize_domain", false
465 * (6) "is_last_name" is a bool which is true if "domainname" is "the last
466 * component of a domainname", false otherwise.
468 struct tomoyo_domain_keeper_entry {
469 struct list_head list;
470 const struct tomoyo_path_info *domainname;
471 const struct tomoyo_path_info *program; /* This may be NULL */
473 bool is_not; /* True if this entry is "no_keep_domain". */
474 /* True if the domainname is tomoyo_get_last_name(). */
479 * tomoyo_alias_entry is a structure which is used for holding "alias" entries.
480 * It has following fields.
482 * (1) "list" which is linked to tomoyo_alias_list .
483 * (2) "original_name" which is a dereferenced pathname.
484 * (3) "aliased_name" which is a symlink's pathname.
485 * (4) "is_deleted" is a bool which is true if marked as deleted, false
488 struct tomoyo_alias_entry {
489 struct list_head list;
490 const struct tomoyo_path_info *original_name;
491 const struct tomoyo_path_info *aliased_name;
496 * tomoyo_policy_manager_entry is a structure which is used for holding list of
497 * domainnames or programs which are permitted to modify configuration via
498 * /sys/kernel/security/tomoyo/ interface.
499 * It has following fields.
501 * (1) "list" which is linked to tomoyo_policy_manager_list .
502 * (2) "manager" is a domainname or a program's pathname.
503 * (3) "is_domain" is a bool which is true if "manager" is a domainname, false
505 * (4) "is_deleted" is a bool which is true if marked as deleted, false
508 struct tomoyo_policy_manager_entry {
509 struct list_head list;
510 /* A path to program or a domainname. */
511 const struct tomoyo_path_info *manager;
512 bool is_domain; /* True if manager is a domainname. */
513 bool is_deleted; /* True if this entry is deleted. */
516 /********** Function prototypes. **********/
518 /* Check whether the domain has too many ACL entries to hold. */
519 bool tomoyo_domain_quota_is_ok(struct tomoyo_domain_info * const domain);
520 /* Transactional sprintf() for policy dump. */
521 bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
522 __attribute__ ((format(printf, 2, 3)));
523 /* Check whether the domainname is correct. */
524 bool tomoyo_is_correct_domain(const unsigned char *domainname,
525 const char *function);
526 /* Check whether the token is correct. */
527 bool tomoyo_is_correct_path(const char *filename, const s8 start_type,
528 const s8 pattern_type, const s8 end_type,
529 const char *function);
530 /* Check whether the token can be a domainname. */
531 bool tomoyo_is_domain_def(const unsigned char *buffer);
532 /* Check whether the given filename matches the given pattern. */
533 bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename,
534 const struct tomoyo_path_info *pattern);
535 /* Read "alias" entry in exception policy. */
536 bool tomoyo_read_alias_policy(struct tomoyo_io_buffer *head);
538 * Read "initialize_domain" and "no_initialize_domain" entry
539 * in exception policy.
541 bool tomoyo_read_domain_initializer_policy(struct tomoyo_io_buffer *head);
542 /* Read "keep_domain" and "no_keep_domain" entry in exception policy. */
543 bool tomoyo_read_domain_keeper_policy(struct tomoyo_io_buffer *head);
544 /* Read "file_pattern" entry in exception policy. */
545 bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head);
546 /* Read "allow_read" entry in exception policy. */
547 bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head);
548 /* Read "deny_rewrite" entry in exception policy. */
549 bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head);
550 /* Write domain policy violation warning message to console? */
551 bool tomoyo_verbose_mode(const struct tomoyo_domain_info *domain);
552 /* Convert double path operation to operation name. */
553 const char *tomoyo_dp2keyword(const u8 operation);
554 /* Get the last component of the given domainname. */
555 const char *tomoyo_get_last_name(const struct tomoyo_domain_info *domain);
556 /* Get warning message. */
557 const char *tomoyo_get_msg(const bool is_enforce);
558 /* Convert single path operation to operation name. */
559 const char *tomoyo_sp2keyword(const u8 operation);
560 /* Create "alias" entry in exception policy. */
561 int tomoyo_write_alias_policy(char *data, const bool is_delete);
563 * Create "initialize_domain" and "no_initialize_domain" entry
564 * in exception policy.
566 int tomoyo_write_domain_initializer_policy(char *data, const bool is_not,
567 const bool is_delete);
568 /* Create "keep_domain" and "no_keep_domain" entry in exception policy. */
569 int tomoyo_write_domain_keeper_policy(char *data, const bool is_not,
570 const bool is_delete);
572 * Create "allow_read/write", "allow_execute", "allow_read", "allow_write",
573 * "allow_create", "allow_unlink", "allow_mkdir", "allow_rmdir",
574 * "allow_mkfifo", "allow_mksock", "allow_mkblock", "allow_mkchar",
575 * "allow_truncate", "allow_symlink", "allow_rewrite", "allow_rename" and
576 * "allow_link" entry in domain policy.
578 int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain,
579 const bool is_delete);
580 /* Create "allow_read" entry in exception policy. */
581 int tomoyo_write_globally_readable_policy(char *data, const bool is_delete);
582 /* Create "deny_rewrite" entry in exception policy. */
583 int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete);
584 /* Create "file_pattern" entry in exception policy. */
585 int tomoyo_write_pattern_policy(char *data, const bool is_delete);
586 /* Find a domain by the given name. */
587 struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname);
588 /* Find or create a domain by the given name. */
589 struct tomoyo_domain_info *tomoyo_find_or_assign_new_domain(const char *
592 /* Check mode for specified functionality. */
593 unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain,
595 /* Fill in "struct tomoyo_path_info" members. */
596 void tomoyo_fill_path_info(struct tomoyo_path_info *ptr);
597 /* Run policy loader when /sbin/init starts. */
598 void tomoyo_load_policy(const char *filename);
600 /* Convert binary string to ascii string. */
601 int tomoyo_encode(char *buffer, int buflen, const char *str);
603 /* Returns realpath(3) of the given pathname but ignores chroot'ed root. */
604 int tomoyo_realpath_from_path2(struct path *path, char *newname,
608 * Returns realpath(3) of the given pathname but ignores chroot'ed root.
609 * These functions use kzalloc(), so the caller must call kfree()
610 * if these functions didn't return NULL.
612 char *tomoyo_realpath(const char *pathname);
614 * Same with tomoyo_realpath() except that it doesn't follow the final symlink.
616 char *tomoyo_realpath_nofollow(const char *pathname);
617 /* Same with tomoyo_realpath() except that the pathname is already solved. */
618 char *tomoyo_realpath_from_path(struct path *path);
620 /* Check memory quota. */
621 bool tomoyo_memory_ok(void *ptr);
624 * Keep the given name on the RAM.
625 * The RAM is shared, so NEVER try to modify or kfree() the returned name.
627 const struct tomoyo_path_info *tomoyo_get_name(const char *name);
629 /* Check for memory usage. */
630 int tomoyo_read_memory_counter(struct tomoyo_io_buffer *head);
632 /* Set memory quota. */
633 int tomoyo_write_memory_quota(struct tomoyo_io_buffer *head);
635 /* Initialize realpath related code. */
636 void __init tomoyo_realpath_init(void);
637 int tomoyo_check_exec_perm(struct tomoyo_domain_info *domain,
638 const struct tomoyo_path_info *filename);
639 int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
640 struct path *path, const int flag);
641 int tomoyo_check_1path_perm(struct tomoyo_domain_info *domain,
642 const u8 operation, struct path *path);
643 int tomoyo_check_2path_perm(struct tomoyo_domain_info *domain,
644 const u8 operation, struct path *path1,
646 int tomoyo_check_rewrite_permission(struct tomoyo_domain_info *domain,
648 int tomoyo_find_next_domain(struct linux_binprm *bprm);
650 /* Run garbage collector. */
651 void tomoyo_run_gc(void);
653 void tomoyo_memory_free(void *ptr);
655 /********** External variable definitions. **********/
658 extern struct srcu_struct tomoyo_ss;
660 /* The list for "struct tomoyo_domain_info". */
661 extern struct list_head tomoyo_domain_list;
663 extern struct list_head tomoyo_domain_initializer_list;
664 extern struct list_head tomoyo_domain_keeper_list;
665 extern struct list_head tomoyo_alias_list;
666 extern struct list_head tomoyo_globally_readable_list;
667 extern struct list_head tomoyo_pattern_list;
668 extern struct list_head tomoyo_no_rewrite_list;
669 extern struct list_head tomoyo_policy_manager_list;
670 extern struct list_head tomoyo_name_list[TOMOYO_MAX_HASH];
671 extern struct mutex tomoyo_name_list_lock;
673 /* Lock for protecting policy. */
674 extern struct mutex tomoyo_policy_lock;
676 /* Has /sbin/init started? */
677 extern bool tomoyo_policy_loaded;
679 /* The kernel's domain. */
680 extern struct tomoyo_domain_info tomoyo_kernel_domain;
682 /********** Inlined functions. **********/
684 static inline int tomoyo_read_lock(void)
686 return srcu_read_lock(&tomoyo_ss);
689 static inline void tomoyo_read_unlock(int idx)
691 srcu_read_unlock(&tomoyo_ss, idx);
694 /* strcmp() for "struct tomoyo_path_info" structure. */
695 static inline bool tomoyo_pathcmp(const struct tomoyo_path_info *a,
696 const struct tomoyo_path_info *b)
698 return a->hash != b->hash || strcmp(a->name, b->name);
702 * tomoyo_is_valid - Check whether the character is a valid char.
704 * @c: The character to check.
706 * Returns true if @c is a valid character, false otherwise.
708 static inline bool tomoyo_is_valid(const unsigned char c)
710 return c > ' ' && c < 127;
714 * tomoyo_is_invalid - Check whether the character is an invalid char.
716 * @c: The character to check.
718 * Returns true if @c is an invalid character, false otherwise.
720 static inline bool tomoyo_is_invalid(const unsigned char c)
722 return c && (c <= ' ' || c >= 127);
725 static inline void tomoyo_put_name(const struct tomoyo_path_info *name)
728 struct tomoyo_name_entry *ptr =
729 container_of(name, struct tomoyo_name_entry, entry);
730 atomic_dec(&ptr->users);
734 static inline struct tomoyo_domain_info *tomoyo_domain(void)
736 return current_cred()->security;
739 static inline struct tomoyo_domain_info *tomoyo_real_domain(struct task_struct
742 return task_cred_xxx(task, security);
746 * list_for_each_cookie - iterate over a list with cookie.
747 * @pos: the &struct list_head to use as a loop cursor.
748 * @cookie: the &struct list_head to use as a cookie.
749 * @head: the head for your list.
751 * Same with list_for_each_rcu() except that this primitive uses @cookie
752 * so that we can continue iteration.
753 * @cookie must be NULL when iteration starts, and @cookie will become
754 * NULL when iteration finishes.
756 #define list_for_each_cookie(pos, cookie, head) \
757 for (({ if (!cookie) \
759 pos = rcu_dereference((cookie)->next); \
760 prefetch(pos->next), pos != (head) || ((cookie) = NULL); \
761 (cookie) = pos, pos = rcu_dereference(pos->next))
763 #endif /* !defined(_SECURITY_TOMOYO_COMMON_H) */