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9590837b KT |
1 | /* |
2 | * security/tomoyo/common.h | |
3 | * | |
4 | * Common functions for TOMOYO. | |
5 | * | |
6 | * Copyright (C) 2005-2009 NTT DATA CORPORATION | |
7 | * | |
39826a1e | 8 | * Version: 2.2.0 2009/04/01 |
9590837b KT |
9 | * |
10 | */ | |
11 | ||
12 | #ifndef _SECURITY_TOMOYO_COMMON_H | |
13 | #define _SECURITY_TOMOYO_COMMON_H | |
14 | ||
15 | #include <linux/ctype.h> | |
16 | #include <linux/string.h> | |
17 | #include <linux/mm.h> | |
18 | #include <linux/file.h> | |
19 | #include <linux/kmod.h> | |
20 | #include <linux/fs.h> | |
21 | #include <linux/sched.h> | |
22 | #include <linux/namei.h> | |
23 | #include <linux/mount.h> | |
24 | #include <linux/list.h> | |
25 | ||
26 | struct dentry; | |
27 | struct vfsmount; | |
28 | ||
c3fa109a TH |
29 | /* |
30 | * tomoyo_page_buffer is a structure which is used for holding a pathname | |
31 | * obtained from "struct dentry" and "struct vfsmount" pair. | |
32 | * As of now, it is 4096 bytes. If users complain that 4096 bytes is too small | |
33 | * (because TOMOYO escapes non ASCII printable characters using \ooo format), | |
34 | * we will make the buffer larger. | |
35 | */ | |
9590837b KT |
36 | struct tomoyo_page_buffer { |
37 | char buffer[4096]; | |
38 | }; | |
39 | ||
c3fa109a TH |
40 | /* |
41 | * tomoyo_path_info is a structure which is used for holding a string data | |
42 | * used by TOMOYO. | |
43 | * This structure has several fields for supporting pattern matching. | |
44 | * | |
45 | * (1) "name" is the '\0' terminated string data. | |
46 | * (2) "hash" is full_name_hash(name, strlen(name)). | |
47 | * This allows tomoyo_pathcmp() to compare by hash before actually compare | |
48 | * using strcmp(). | |
49 | * (3) "const_len" is the length of the initial segment of "name" which | |
50 | * consists entirely of non wildcard characters. In other words, the length | |
51 | * which we can compare two strings using strncmp(). | |
52 | * (4) "is_dir" is a bool which is true if "name" ends with "/", | |
53 | * false otherwise. | |
54 | * TOMOYO distinguishes directory and non-directory. A directory ends with | |
55 | * "/" and non-directory does not end with "/". | |
56 | * (5) "is_patterned" is a bool which is true if "name" contains wildcard | |
57 | * characters, false otherwise. This allows TOMOYO to use "hash" and | |
58 | * strcmp() for string comparison if "is_patterned" is false. | |
c3fa109a | 59 | */ |
9590837b KT |
60 | struct tomoyo_path_info { |
61 | const char *name; | |
62 | u32 hash; /* = full_name_hash(name, strlen(name)) */ | |
9590837b KT |
63 | u16 const_len; /* = tomoyo_const_part_length(name) */ |
64 | bool is_dir; /* = tomoyo_strendswith(name, "/") */ | |
65 | bool is_patterned; /* = tomoyo_path_contains_pattern(name) */ | |
9590837b KT |
66 | }; |
67 | ||
68 | /* | |
69 | * This is the max length of a token. | |
70 | * | |
71 | * A token consists of only ASCII printable characters. | |
72 | * Non printable characters in a token is represented in \ooo style | |
73 | * octal string. Thus, \ itself is represented as \\. | |
74 | */ | |
75 | #define TOMOYO_MAX_PATHNAME_LEN 4000 | |
76 | ||
c3fa109a TH |
77 | /* |
78 | * tomoyo_path_info_with_data is a structure which is used for holding a | |
79 | * pathname obtained from "struct dentry" and "struct vfsmount" pair. | |
80 | * | |
81 | * "struct tomoyo_path_info_with_data" consists of "struct tomoyo_path_info" | |
82 | * and buffer for the pathname, while "struct tomoyo_page_buffer" consists of | |
83 | * buffer for the pathname only. | |
84 | * | |
85 | * "struct tomoyo_path_info_with_data" is intended to allow TOMOYO to release | |
86 | * both "struct tomoyo_path_info" and buffer for the pathname by single kfree() | |
87 | * so that we don't need to return two pointers to the caller. If the caller | |
88 | * puts "struct tomoyo_path_info" on stack memory, we will be able to remove | |
89 | * "struct tomoyo_path_info_with_data". | |
90 | */ | |
9590837b KT |
91 | struct tomoyo_path_info_with_data { |
92 | /* Keep "head" first, for this pointer is passed to tomoyo_free(). */ | |
93 | struct tomoyo_path_info head; | |
a106cbfd | 94 | char barrier1[16]; /* Safeguard for overrun. */ |
9590837b KT |
95 | char body[TOMOYO_MAX_PATHNAME_LEN]; |
96 | char barrier2[16]; /* Safeguard for overrun. */ | |
97 | }; | |
98 | ||
99 | /* | |
c3fa109a TH |
100 | * tomoyo_acl_info is a structure which is used for holding |
101 | * | |
102 | * (1) "list" which is linked to the ->acl_info_list of | |
103 | * "struct tomoyo_domain_info" | |
104 | * (2) "type" which tells | |
105 | * (a) type & 0x7F : type of the entry (either | |
106 | * "struct tomoyo_single_path_acl_record" or | |
107 | * "struct tomoyo_double_path_acl_record") | |
108 | * (b) type & 0x80 : whether the entry is marked as "deleted". | |
9590837b KT |
109 | * |
110 | * Packing "struct tomoyo_acl_info" allows | |
937bf613 | 111 | * "struct tomoyo_single_path_acl_record" to embed "u8" + "u16" and |
9590837b KT |
112 | * "struct tomoyo_double_path_acl_record" to embed "u8" |
113 | * without enlarging their structure size. | |
114 | */ | |
115 | struct tomoyo_acl_info { | |
116 | struct list_head list; | |
117 | /* | |
118 | * Type of this ACL entry. | |
119 | * | |
120 | * MSB is is_deleted flag. | |
121 | */ | |
122 | u8 type; | |
123 | } __packed; | |
124 | ||
125 | /* This ACL entry is deleted. */ | |
126 | #define TOMOYO_ACL_DELETED 0x80 | |
127 | ||
c3fa109a TH |
128 | /* |
129 | * tomoyo_domain_info is a structure which is used for holding permissions | |
130 | * (e.g. "allow_read /lib/libc-2.5.so") given to each domain. | |
131 | * It has following fields. | |
132 | * | |
133 | * (1) "list" which is linked to tomoyo_domain_list . | |
134 | * (2) "acl_info_list" which is linked to "struct tomoyo_acl_info". | |
135 | * (3) "domainname" which holds the name of the domain. | |
136 | * (4) "profile" which remembers profile number assigned to this domain. | |
137 | * (5) "is_deleted" is a bool which is true if this domain is marked as | |
138 | * "deleted", false otherwise. | |
139 | * (6) "quota_warned" is a bool which is used for suppressing warning message | |
140 | * when learning mode learned too much entries. | |
141 | * (7) "flags" which remembers this domain's attributes. | |
142 | * | |
143 | * A domain's lifecycle is an analogy of files on / directory. | |
144 | * Multiple domains with the same domainname cannot be created (as with | |
145 | * creating files with the same filename fails with -EEXIST). | |
146 | * If a process reached a domain, that process can reside in that domain after | |
147 | * that domain is marked as "deleted" (as with a process can access an already | |
148 | * open()ed file after that file was unlink()ed). | |
149 | */ | |
9590837b KT |
150 | struct tomoyo_domain_info { |
151 | struct list_head list; | |
152 | struct list_head acl_info_list; | |
153 | /* Name of this domain. Never NULL. */ | |
154 | const struct tomoyo_path_info *domainname; | |
155 | u8 profile; /* Profile number to use. */ | |
a0558fc3 | 156 | bool is_deleted; /* Delete flag. */ |
9590837b KT |
157 | bool quota_warned; /* Quota warnning flag. */ |
158 | /* DOMAIN_FLAGS_*. Use tomoyo_set_domain_flag() to modify. */ | |
159 | u8 flags; | |
160 | }; | |
161 | ||
162 | /* Profile number is an integer between 0 and 255. */ | |
163 | #define TOMOYO_MAX_PROFILES 256 | |
164 | ||
165 | /* Ignore "allow_read" directive in exception policy. */ | |
166 | #define TOMOYO_DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ 1 | |
167 | /* | |
168 | * This domain was unable to create a new domain at tomoyo_find_next_domain() | |
169 | * because the name of the domain to be created was too long or | |
170 | * it could not allocate memory. | |
171 | * More than one process continued execve() without domain transition. | |
172 | */ | |
173 | #define TOMOYO_DOMAIN_FLAGS_TRANSITION_FAILED 2 | |
174 | ||
175 | /* | |
c3fa109a TH |
176 | * tomoyo_single_path_acl_record is a structure which is used for holding an |
177 | * entry with one pathname operation (e.g. open(), mkdir()). | |
178 | * It has following fields. | |
179 | * | |
180 | * (1) "head" which is a "struct tomoyo_acl_info". | |
181 | * (2) "perm" which is a bitmask of permitted operations. | |
182 | * (3) "filename" is the pathname. | |
183 | * | |
184 | * Directives held by this structure are "allow_read/write", "allow_execute", | |
185 | * "allow_read", "allow_write", "allow_create", "allow_unlink", "allow_mkdir", | |
186 | * "allow_rmdir", "allow_mkfifo", "allow_mksock", "allow_mkblock", | |
937bf613 TH |
187 | * "allow_mkchar", "allow_truncate", "allow_symlink", "allow_rewrite", |
188 | * "allow_chmod", "allow_chown", "allow_chgrp", "allow_chroot", "allow_mount" | |
189 | * and "allow_unmount". | |
9590837b KT |
190 | */ |
191 | struct tomoyo_single_path_acl_record { | |
192 | struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_SINGLE_PATH_ACL */ | |
937bf613 | 193 | u8 perm_high; |
9590837b KT |
194 | u16 perm; |
195 | /* Pointer to single pathname. */ | |
196 | const struct tomoyo_path_info *filename; | |
197 | }; | |
198 | ||
c3fa109a TH |
199 | /* |
200 | * tomoyo_double_path_acl_record is a structure which is used for holding an | |
937bf613 | 201 | * entry with two pathnames operation (i.e. link(), rename() and pivot_root()). |
c3fa109a TH |
202 | * It has following fields. |
203 | * | |
204 | * (1) "head" which is a "struct tomoyo_acl_info". | |
205 | * (2) "perm" which is a bitmask of permitted operations. | |
206 | * (3) "filename1" is the source/old pathname. | |
207 | * (4) "filename2" is the destination/new pathname. | |
208 | * | |
937bf613 TH |
209 | * Directives held by this structure are "allow_rename", "allow_link" and |
210 | * "allow_pivot_root". | |
c3fa109a | 211 | */ |
9590837b KT |
212 | struct tomoyo_double_path_acl_record { |
213 | struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_DOUBLE_PATH_ACL */ | |
214 | u8 perm; | |
215 | /* Pointer to single pathname. */ | |
216 | const struct tomoyo_path_info *filename1; | |
217 | /* Pointer to single pathname. */ | |
218 | const struct tomoyo_path_info *filename2; | |
219 | }; | |
220 | ||
221 | /* Keywords for ACLs. */ | |
222 | #define TOMOYO_KEYWORD_ALIAS "alias " | |
223 | #define TOMOYO_KEYWORD_ALLOW_READ "allow_read " | |
224 | #define TOMOYO_KEYWORD_DELETE "delete " | |
225 | #define TOMOYO_KEYWORD_DENY_REWRITE "deny_rewrite " | |
226 | #define TOMOYO_KEYWORD_FILE_PATTERN "file_pattern " | |
227 | #define TOMOYO_KEYWORD_INITIALIZE_DOMAIN "initialize_domain " | |
228 | #define TOMOYO_KEYWORD_KEEP_DOMAIN "keep_domain " | |
229 | #define TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN "no_initialize_domain " | |
230 | #define TOMOYO_KEYWORD_NO_KEEP_DOMAIN "no_keep_domain " | |
231 | #define TOMOYO_KEYWORD_SELECT "select " | |
9590837b KT |
232 | #define TOMOYO_KEYWORD_USE_PROFILE "use_profile " |
233 | #define TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "ignore_global_allow_read" | |
234 | /* A domain definition starts with <kernel>. */ | |
235 | #define TOMOYO_ROOT_NAME "<kernel>" | |
236 | #define TOMOYO_ROOT_NAME_LEN (sizeof(TOMOYO_ROOT_NAME) - 1) | |
237 | ||
238 | /* Index numbers for Access Controls. */ | |
239 | #define TOMOYO_MAC_FOR_FILE 0 /* domain_policy.conf */ | |
240 | #define TOMOYO_MAX_ACCEPT_ENTRY 1 | |
241 | #define TOMOYO_VERBOSE 2 | |
242 | #define TOMOYO_MAX_CONTROL_INDEX 3 | |
243 | ||
c3fa109a TH |
244 | /* |
245 | * tomoyo_io_buffer is a structure which is used for reading and modifying | |
246 | * configuration via /sys/kernel/security/tomoyo/ interface. | |
247 | * It has many fields. ->read_var1 , ->read_var2 , ->write_var1 are used as | |
248 | * cursors. | |
249 | * | |
250 | * Since the content of /sys/kernel/security/tomoyo/domain_policy is a list of | |
251 | * "struct tomoyo_domain_info" entries and each "struct tomoyo_domain_info" | |
252 | * entry has a list of "struct tomoyo_acl_info", we need two cursors when | |
253 | * reading (one is for traversing tomoyo_domain_list and the other is for | |
254 | * traversing "struct tomoyo_acl_info"->acl_info_list ). | |
255 | * | |
256 | * If a line written to /sys/kernel/security/tomoyo/domain_policy starts with | |
257 | * "select ", TOMOYO seeks the cursor ->read_var1 and ->write_var1 to the | |
258 | * domain with the domainname specified by the rest of that line (NULL is set | |
259 | * if seek failed). | |
260 | * If a line written to /sys/kernel/security/tomoyo/domain_policy starts with | |
261 | * "delete ", TOMOYO deletes an entry or a domain specified by the rest of that | |
262 | * line (->write_var1 is set to NULL if a domain was deleted). | |
263 | * If a line written to /sys/kernel/security/tomoyo/domain_policy starts with | |
264 | * neither "select " nor "delete ", an entry or a domain specified by that line | |
265 | * is appended. | |
266 | */ | |
9590837b KT |
267 | struct tomoyo_io_buffer { |
268 | int (*read) (struct tomoyo_io_buffer *); | |
269 | int (*write) (struct tomoyo_io_buffer *); | |
270 | /* Exclusive lock for this structure. */ | |
271 | struct mutex io_sem; | |
fdb8ebb7 TH |
272 | /* Index returned by tomoyo_read_lock(). */ |
273 | int reader_idx; | |
9590837b KT |
274 | /* The position currently reading from. */ |
275 | struct list_head *read_var1; | |
276 | /* Extra variables for reading. */ | |
277 | struct list_head *read_var2; | |
278 | /* The position currently writing to. */ | |
279 | struct tomoyo_domain_info *write_var1; | |
280 | /* The step for reading. */ | |
281 | int read_step; | |
282 | /* Buffer for reading. */ | |
283 | char *read_buf; | |
284 | /* EOF flag for reading. */ | |
285 | bool read_eof; | |
286 | /* Read domain ACL of specified PID? */ | |
287 | bool read_single_domain; | |
288 | /* Extra variable for reading. */ | |
289 | u8 read_bit; | |
290 | /* Bytes available for reading. */ | |
291 | int read_avail; | |
292 | /* Size of read buffer. */ | |
293 | int readbuf_size; | |
294 | /* Buffer for writing. */ | |
295 | char *write_buf; | |
296 | /* Bytes available for writing. */ | |
297 | int write_avail; | |
298 | /* Size of write buffer. */ | |
299 | int writebuf_size; | |
300 | }; | |
301 | ||
302 | /* Check whether the domain has too many ACL entries to hold. */ | |
303 | bool tomoyo_domain_quota_is_ok(struct tomoyo_domain_info * const domain); | |
304 | /* Transactional sprintf() for policy dump. */ | |
305 | bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...) | |
306 | __attribute__ ((format(printf, 2, 3))); | |
307 | /* Check whether the domainname is correct. */ | |
308 | bool tomoyo_is_correct_domain(const unsigned char *domainname, | |
309 | const char *function); | |
310 | /* Check whether the token is correct. */ | |
311 | bool tomoyo_is_correct_path(const char *filename, const s8 start_type, | |
312 | const s8 pattern_type, const s8 end_type, | |
313 | const char *function); | |
314 | /* Check whether the token can be a domainname. */ | |
315 | bool tomoyo_is_domain_def(const unsigned char *buffer); | |
316 | /* Check whether the given filename matches the given pattern. */ | |
317 | bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename, | |
318 | const struct tomoyo_path_info *pattern); | |
319 | /* Read "alias" entry in exception policy. */ | |
320 | bool tomoyo_read_alias_policy(struct tomoyo_io_buffer *head); | |
321 | /* | |
322 | * Read "initialize_domain" and "no_initialize_domain" entry | |
323 | * in exception policy. | |
324 | */ | |
325 | bool tomoyo_read_domain_initializer_policy(struct tomoyo_io_buffer *head); | |
326 | /* Read "keep_domain" and "no_keep_domain" entry in exception policy. */ | |
327 | bool tomoyo_read_domain_keeper_policy(struct tomoyo_io_buffer *head); | |
328 | /* Read "file_pattern" entry in exception policy. */ | |
329 | bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head); | |
330 | /* Read "allow_read" entry in exception policy. */ | |
331 | bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head); | |
332 | /* Read "deny_rewrite" entry in exception policy. */ | |
333 | bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head); | |
334 | /* Write domain policy violation warning message to console? */ | |
335 | bool tomoyo_verbose_mode(const struct tomoyo_domain_info *domain); | |
336 | /* Convert double path operation to operation name. */ | |
337 | const char *tomoyo_dp2keyword(const u8 operation); | |
338 | /* Get the last component of the given domainname. */ | |
339 | const char *tomoyo_get_last_name(const struct tomoyo_domain_info *domain); | |
340 | /* Get warning message. */ | |
341 | const char *tomoyo_get_msg(const bool is_enforce); | |
342 | /* Convert single path operation to operation name. */ | |
343 | const char *tomoyo_sp2keyword(const u8 operation); | |
9590837b KT |
344 | /* Create "alias" entry in exception policy. */ |
345 | int tomoyo_write_alias_policy(char *data, const bool is_delete); | |
346 | /* | |
347 | * Create "initialize_domain" and "no_initialize_domain" entry | |
348 | * in exception policy. | |
349 | */ | |
350 | int tomoyo_write_domain_initializer_policy(char *data, const bool is_not, | |
351 | const bool is_delete); | |
352 | /* Create "keep_domain" and "no_keep_domain" entry in exception policy. */ | |
353 | int tomoyo_write_domain_keeper_policy(char *data, const bool is_not, | |
354 | const bool is_delete); | |
355 | /* | |
356 | * Create "allow_read/write", "allow_execute", "allow_read", "allow_write", | |
357 | * "allow_create", "allow_unlink", "allow_mkdir", "allow_rmdir", | |
358 | * "allow_mkfifo", "allow_mksock", "allow_mkblock", "allow_mkchar", | |
359 | * "allow_truncate", "allow_symlink", "allow_rewrite", "allow_rename" and | |
360 | * "allow_link" entry in domain policy. | |
361 | */ | |
362 | int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain, | |
363 | const bool is_delete); | |
364 | /* Create "allow_read" entry in exception policy. */ | |
365 | int tomoyo_write_globally_readable_policy(char *data, const bool is_delete); | |
366 | /* Create "deny_rewrite" entry in exception policy. */ | |
367 | int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete); | |
368 | /* Create "file_pattern" entry in exception policy. */ | |
369 | int tomoyo_write_pattern_policy(char *data, const bool is_delete); | |
370 | /* Find a domain by the given name. */ | |
371 | struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname); | |
372 | /* Find or create a domain by the given name. */ | |
373 | struct tomoyo_domain_info *tomoyo_find_or_assign_new_domain(const char * | |
374 | domainname, | |
375 | const u8 profile); | |
9590837b KT |
376 | /* Check mode for specified functionality. */ |
377 | unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain, | |
378 | const u8 index); | |
9590837b KT |
379 | /* Fill in "struct tomoyo_path_info" members. */ |
380 | void tomoyo_fill_path_info(struct tomoyo_path_info *ptr); | |
381 | /* Run policy loader when /sbin/init starts. */ | |
382 | void tomoyo_load_policy(const char *filename); | |
383 | /* Change "struct tomoyo_domain_info"->flags. */ | |
384 | void tomoyo_set_domain_flag(struct tomoyo_domain_info *domain, | |
385 | const bool is_delete, const u8 flags); | |
386 | ||
387 | /* strcmp() for "struct tomoyo_path_info" structure. */ | |
388 | static inline bool tomoyo_pathcmp(const struct tomoyo_path_info *a, | |
389 | const struct tomoyo_path_info *b) | |
390 | { | |
391 | return a->hash != b->hash || strcmp(a->name, b->name); | |
392 | } | |
393 | ||
394 | /* Get type of an ACL entry. */ | |
395 | static inline u8 tomoyo_acl_type1(struct tomoyo_acl_info *ptr) | |
396 | { | |
397 | return ptr->type & ~TOMOYO_ACL_DELETED; | |
398 | } | |
399 | ||
400 | /* Get type of an ACL entry. */ | |
401 | static inline u8 tomoyo_acl_type2(struct tomoyo_acl_info *ptr) | |
402 | { | |
403 | return ptr->type; | |
404 | } | |
405 | ||
406 | /** | |
407 | * tomoyo_is_valid - Check whether the character is a valid char. | |
408 | * | |
409 | * @c: The character to check. | |
410 | * | |
411 | * Returns true if @c is a valid character, false otherwise. | |
412 | */ | |
413 | static inline bool tomoyo_is_valid(const unsigned char c) | |
414 | { | |
415 | return c > ' ' && c < 127; | |
416 | } | |
417 | ||
418 | /** | |
419 | * tomoyo_is_invalid - Check whether the character is an invalid char. | |
420 | * | |
421 | * @c: The character to check. | |
422 | * | |
423 | * Returns true if @c is an invalid character, false otherwise. | |
424 | */ | |
425 | static inline bool tomoyo_is_invalid(const unsigned char c) | |
426 | { | |
427 | return c && (c <= ' ' || c >= 127); | |
428 | } | |
429 | ||
430 | /* The list for "struct tomoyo_domain_info". */ | |
431 | extern struct list_head tomoyo_domain_list; | |
9590837b | 432 | |
f737d95d TH |
433 | /* Lock for protecting policy. */ |
434 | extern struct mutex tomoyo_policy_lock; | |
9590837b KT |
435 | |
436 | /* Has /sbin/init started? */ | |
437 | extern bool tomoyo_policy_loaded; | |
438 | ||
439 | /* The kernel's domain. */ | |
440 | extern struct tomoyo_domain_info tomoyo_kernel_domain; | |
441 | ||
442 | /** | |
443 | * list_for_each_cookie - iterate over a list with cookie. | |
444 | * @pos: the &struct list_head to use as a loop cursor. | |
445 | * @cookie: the &struct list_head to use as a cookie. | |
446 | * @head: the head for your list. | |
447 | * | |
fdb8ebb7 | 448 | * Same with list_for_each_rcu() except that this primitive uses @cookie |
9590837b KT |
449 | * so that we can continue iteration. |
450 | * @cookie must be NULL when iteration starts, and @cookie will become | |
451 | * NULL when iteration finishes. | |
452 | */ | |
fdb8ebb7 TH |
453 | #define list_for_each_cookie(pos, cookie, head) \ |
454 | for (({ if (!cookie) \ | |
455 | cookie = head; }), \ | |
456 | pos = rcu_dereference((cookie)->next); \ | |
457 | prefetch(pos->next), pos != (head) || ((cookie) = NULL); \ | |
458 | (cookie) = pos, pos = rcu_dereference(pos->next)) | |
459 | ||
460 | extern struct srcu_struct tomoyo_ss; | |
461 | ||
462 | static inline int tomoyo_read_lock(void) | |
463 | { | |
464 | return srcu_read_lock(&tomoyo_ss); | |
465 | } | |
466 | ||
467 | static inline void tomoyo_read_unlock(int idx) | |
468 | { | |
469 | srcu_read_unlock(&tomoyo_ss, idx); | |
470 | } | |
9590837b KT |
471 | |
472 | #endif /* !defined(_SECURITY_TOMOYO_COMMON_H) */ |