security/tomoyo/common.h

   1 /*
   2  * security/tomoyo/common.h
   3  *
   4  * Header file for TOMOYO.
   5  *
   6  * Copyright (C) 2005-2010  NTT DATA CORPORATION
   7  */
   8
   9 #ifndef _SECURITY_TOMOYO_COMMON_H
  10 #define _SECURITY_TOMOYO_COMMON_H
  11
  12 #include <linux/ctype.h>
  13 #include <linux/string.h>
  14 #include <linux/mm.h>
  15 #include <linux/file.h>
  16 #include <linux/kmod.h>
  17 #include <linux/fs.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>
  23 #include <linux/poll.h>
  24 struct linux_binprm;
  25
  26 /********** Constants definitions. **********/
  27
  28 /*
  29  * TOMOYO uses this hash only when appending a string into the string
  30  * table. Frequency of appending strings is very low. So we don't need
  31  * large (e.g. 64k) hash size. 256 will be sufficient.
  32  */
  33 #define TOMOYO_HASH_BITS  8
  34 #define TOMOYO_MAX_HASH (1u<<TOMOYO_HASH_BITS)
  35
  36 #define TOMOYO_EXEC_TMPSIZE     4096
  37
  38 /* Profile number is an integer between 0 and 255. */
  39 #define TOMOYO_MAX_PROFILES 256
  40
  41 /* Index numbers for operation mode. */
  42 enum tomoyo_mode_index {
  43         TOMOYO_CONFIG_DISABLED,
  44         TOMOYO_CONFIG_LEARNING,
  45         TOMOYO_CONFIG_PERMISSIVE,
  46         TOMOYO_CONFIG_ENFORCING,
  47         TOMOYO_CONFIG_USE_DEFAULT = 255
  48 };
  49
  50 /* Index numbers for entry type. */
  51 enum tomoyo_policy_id {
  52         TOMOYO_ID_GROUP,
  53         TOMOYO_ID_PATH_GROUP,
  54         TOMOYO_ID_NUMBER_GROUP,
  55         TOMOYO_ID_TRANSITION_CONTROL,
  56         TOMOYO_ID_AGGREGATOR,
  57         TOMOYO_ID_MANAGER,
  58         TOMOYO_ID_NAME,
  59         TOMOYO_ID_ACL,
  60         TOMOYO_ID_DOMAIN,
  61         TOMOYO_MAX_POLICY
  62 };
  63
  64 /* Index numbers for group entries. */
  65 enum tomoyo_group_id {
  66         TOMOYO_PATH_GROUP,
  67         TOMOYO_NUMBER_GROUP,
  68         TOMOYO_MAX_GROUP
  69 };
  70
  71 /* A domain definition starts with <kernel>. */
  72 #define TOMOYO_ROOT_NAME                         "<kernel>"
  73 #define TOMOYO_ROOT_NAME_LEN                     (sizeof(TOMOYO_ROOT_NAME) - 1)
  74
  75 /* Index numbers for type of numeric values. */
  76 enum tomoyo_value_type {
  77         TOMOYO_VALUE_TYPE_INVALID,
  78         TOMOYO_VALUE_TYPE_DECIMAL,
  79         TOMOYO_VALUE_TYPE_OCTAL,
  80         TOMOYO_VALUE_TYPE_HEXADECIMAL,
  81 };
  82
  83 /* Index numbers for domain transition control keywords. */
  84 enum tomoyo_transition_type {
  85         /* Do not change this order, */
  86         TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE,
  87         TOMOYO_TRANSITION_CONTROL_INITIALIZE,
  88         TOMOYO_TRANSITION_CONTROL_NO_KEEP,
  89         TOMOYO_TRANSITION_CONTROL_KEEP,
  90         TOMOYO_MAX_TRANSITION_TYPE
  91 };
  92
  93 /* Index numbers for Access Controls. */
  94 enum tomoyo_acl_entry_type_index {
  95         TOMOYO_TYPE_PATH_ACL,
  96         TOMOYO_TYPE_PATH2_ACL,
  97         TOMOYO_TYPE_PATH_NUMBER_ACL,
  98         TOMOYO_TYPE_MKDEV_ACL,
  99         TOMOYO_TYPE_MOUNT_ACL,
 100 };
 101
 102 /* Index numbers for access controls with one pathname. */
 103 enum tomoyo_path_acl_index {
 104         TOMOYO_TYPE_EXECUTE,
 105         TOMOYO_TYPE_READ,
 106         TOMOYO_TYPE_WRITE,
 107         TOMOYO_TYPE_APPEND,
 108         TOMOYO_TYPE_UNLINK,
 109         TOMOYO_TYPE_GETATTR,
 110         TOMOYO_TYPE_RMDIR,
 111         TOMOYO_TYPE_TRUNCATE,
 112         TOMOYO_TYPE_SYMLINK,
 113         TOMOYO_TYPE_CHROOT,
 114         TOMOYO_TYPE_UMOUNT,
 115         TOMOYO_MAX_PATH_OPERATION
 116 };
 117
 118 enum tomoyo_mkdev_acl_index {
 119         TOMOYO_TYPE_MKBLOCK,
 120         TOMOYO_TYPE_MKCHAR,
 121         TOMOYO_MAX_MKDEV_OPERATION
 122 };
 123
 124 /* Index numbers for access controls with two pathnames. */
 125 enum tomoyo_path2_acl_index {
 126         TOMOYO_TYPE_LINK,
 127         TOMOYO_TYPE_RENAME,
 128         TOMOYO_TYPE_PIVOT_ROOT,
 129         TOMOYO_MAX_PATH2_OPERATION
 130 };
 131
 132 /* Index numbers for access controls with one pathname and one number. */
 133 enum tomoyo_path_number_acl_index {
 134         TOMOYO_TYPE_CREATE,
 135         TOMOYO_TYPE_MKDIR,
 136         TOMOYO_TYPE_MKFIFO,
 137         TOMOYO_TYPE_MKSOCK,
 138         TOMOYO_TYPE_IOCTL,
 139         TOMOYO_TYPE_CHMOD,
 140         TOMOYO_TYPE_CHOWN,
 141         TOMOYO_TYPE_CHGRP,
 142         TOMOYO_MAX_PATH_NUMBER_OPERATION
 143 };
 144
 145 /* Index numbers for /sys/kernel/security/tomoyo/ interfaces. */
 146 enum tomoyo_securityfs_interface_index {
 147         TOMOYO_DOMAINPOLICY,
 148         TOMOYO_EXCEPTIONPOLICY,
 149         TOMOYO_DOMAIN_STATUS,
 150         TOMOYO_PROCESS_STATUS,
 151         TOMOYO_MEMINFO,
 152         TOMOYO_SELFDOMAIN,
 153         TOMOYO_VERSION,
 154         TOMOYO_PROFILE,
 155         TOMOYO_QUERY,
 156         TOMOYO_MANAGER
 157 };
 158
 159 /* Index numbers for special mount operations. */
 160 enum tomoyo_special_mount {
 161         TOMOYO_MOUNT_BIND,            /* mount --bind /source /dest   */
 162         TOMOYO_MOUNT_MOVE,            /* mount --move /old /new       */
 163         TOMOYO_MOUNT_REMOUNT,         /* mount -o remount /dir        */
 164         TOMOYO_MOUNT_MAKE_UNBINDABLE, /* mount --make-unbindable /dir */
 165         TOMOYO_MOUNT_MAKE_PRIVATE,    /* mount --make-private /dir    */
 166         TOMOYO_MOUNT_MAKE_SLAVE,      /* mount --make-slave /dir      */
 167         TOMOYO_MOUNT_MAKE_SHARED,     /* mount --make-shared /dir     */
 168         TOMOYO_MAX_SPECIAL_MOUNT
 169 };
 170
 171 /* Index numbers for functionality. */
 172 enum tomoyo_mac_index {
 173         TOMOYO_MAC_FILE_EXECUTE,
 174         TOMOYO_MAC_FILE_OPEN,
 175         TOMOYO_MAC_FILE_CREATE,
 176         TOMOYO_MAC_FILE_UNLINK,
 177         TOMOYO_MAC_FILE_GETATTR,
 178         TOMOYO_MAC_FILE_MKDIR,
 179         TOMOYO_MAC_FILE_RMDIR,
 180         TOMOYO_MAC_FILE_MKFIFO,
 181         TOMOYO_MAC_FILE_MKSOCK,
 182         TOMOYO_MAC_FILE_TRUNCATE,
 183         TOMOYO_MAC_FILE_SYMLINK,
 184         TOMOYO_MAC_FILE_MKBLOCK,
 185         TOMOYO_MAC_FILE_MKCHAR,
 186         TOMOYO_MAC_FILE_LINK,
 187         TOMOYO_MAC_FILE_RENAME,
 188         TOMOYO_MAC_FILE_CHMOD,
 189         TOMOYO_MAC_FILE_CHOWN,
 190         TOMOYO_MAC_FILE_CHGRP,
 191         TOMOYO_MAC_FILE_IOCTL,
 192         TOMOYO_MAC_FILE_CHROOT,
 193         TOMOYO_MAC_FILE_MOUNT,
 194         TOMOYO_MAC_FILE_UMOUNT,
 195         TOMOYO_MAC_FILE_PIVOT_ROOT,
 196         TOMOYO_MAX_MAC_INDEX
 197 };
 198
 199 /* Index numbers for category of functionality. */
 200 enum tomoyo_mac_category_index {
 201         TOMOYO_MAC_CATEGORY_FILE,
 202         TOMOYO_MAX_MAC_CATEGORY_INDEX
 203 };
 204
 205 /*
 206  * Retry this request. Returned by tomoyo_supervisor() if policy violation has
 207  * occurred in enforcing mode and the userspace daemon decided to retry.
 208  *
 209  * We must choose a positive value in order to distinguish "granted" (which is
 210  * 0) and "rejected" (which is a negative value) and "retry".
 211  */
 212 #define TOMOYO_RETRY_REQUEST 1
 213
 214 /********** Structure definitions. **********/
 215
 216 /* Common header for holding ACL entries. */
 217 struct tomoyo_acl_head {
 218         struct list_head list;
 219         bool is_deleted;
 220 } __packed;
 221
 222 /* Common header for shared entries. */
 223 struct tomoyo_shared_acl_head {
 224         struct list_head list;
 225         atomic_t users;
 226 } __packed;
 227
 228 /* Structure for request info. */
 229 struct tomoyo_request_info {
 230         struct tomoyo_domain_info *domain;
 231         /* For holding parameters. */
 232         union {
 233                 struct {
 234                         const struct tomoyo_path_info *filename;
 235                         /* For using wildcards at tomoyo_find_next_domain(). */
 236                         const struct tomoyo_path_info *matched_path;
 237                         /* One of values in "enum tomoyo_path_acl_index". */
 238                         u8 operation;
 239                 } path;
 240                 struct {
 241                         const struct tomoyo_path_info *filename1;
 242                         const struct tomoyo_path_info *filename2;
 243                         /* One of values in "enum tomoyo_path2_acl_index". */
 244                         u8 operation;
 245                 } path2;
 246                 struct {
 247                         const struct tomoyo_path_info *filename;
 248                         unsigned int mode;
 249                         unsigned int major;
 250                         unsigned int minor;
 251                         /* One of values in "enum tomoyo_mkdev_acl_index". */
 252                         u8 operation;
 253                 } mkdev;
 254                 struct {
 255                         const struct tomoyo_path_info *filename;
 256                         unsigned long number;
 257                         /*
 258                          * One of values in
 259                          * "enum tomoyo_path_number_acl_index".
 260                          */
 261                         u8 operation;
 262                 } path_number;
 263                 struct {
 264                         const struct tomoyo_path_info *type;
 265                         const struct tomoyo_path_info *dir;
 266                         const struct tomoyo_path_info *dev;
 267                         unsigned long flags;
 268                         int need_dev;
 269                 } mount;
 270         } param;
 271         u8 param_type;
 272         bool granted;
 273         u8 retry;
 274         u8 profile;
 275         u8 mode; /* One of tomoyo_mode_index . */
 276         u8 type;
 277 };
 278
 279 /* Structure for holding a token. */
 280 struct tomoyo_path_info {
 281         const char *name;
 282         u32 hash;          /* = full_name_hash(name, strlen(name)) */
 283         u16 const_len;     /* = tomoyo_const_part_length(name)     */
 284         bool is_dir;       /* = tomoyo_strendswith(name, "/")      */
 285         bool is_patterned; /* = tomoyo_path_contains_pattern(name) */
 286 };
 287
 288 /* Structure for holding string data. */
 289 struct tomoyo_name {
 290         struct tomoyo_shared_acl_head head;
 291         struct tomoyo_path_info entry;
 292 };
 293
 294 /* Structure for holding a word. */
 295 struct tomoyo_name_union {
 296         /* Either @filename or @group is NULL. */
 297         const struct tomoyo_path_info *filename;
 298         struct tomoyo_group *group;
 299 };
 300
 301 /* Structure for holding a number. */
 302 struct tomoyo_number_union {
 303         unsigned long values[2];
 304         struct tomoyo_group *group; /* Maybe NULL. */
 305         /* One of values in "enum tomoyo_value_type". */
 306         u8 value_type[2];
 307 };
 308
 309 /* Structure for "path_group"/"number_group" directive. */
 310 struct tomoyo_group {
 311         struct tomoyo_shared_acl_head head;
 312         const struct tomoyo_path_info *group_name;
 313         struct list_head member_list;
 314 };
 315
 316 /* Structure for "path_group" directive. */
 317 struct tomoyo_path_group {
 318         struct tomoyo_acl_head head;
 319         const struct tomoyo_path_info *member_name;
 320 };
 321
 322 /* Structure for "number_group" directive. */
 323 struct tomoyo_number_group {
 324         struct tomoyo_acl_head head;
 325         struct tomoyo_number_union number;
 326 };
 327
 328 /* Common header for individual entries. */
 329 struct tomoyo_acl_info {
 330         struct list_head list;
 331         bool is_deleted;
 332         u8 type; /* One of values in "enum tomoyo_acl_entry_type_index". */
 333 } __packed;
 334
 335 /* Structure for domain information. */
 336 struct tomoyo_domain_info {
 337         struct list_head list;
 338         struct list_head acl_info_list;
 339         /* Name of this domain. Never NULL.          */
 340         const struct tomoyo_path_info *domainname;
 341         u8 profile;        /* Profile number to use. */
 342         bool is_deleted;   /* Delete flag.           */
 343         bool quota_warned; /* Quota warnning flag.   */
 344         bool transition_failed; /* Domain transition failed flag. */
 345         atomic_t users; /* Number of referring credentials. */
 346 };
 347
 348 /*
 349  * Structure for "file execute", "file read", "file write", "file append",
 350  * "file unlink", "file getattr", "file rmdir", "file truncate",
 351  * "file symlink", "file chroot" and "file unmount" directive.
 352  */
 353 struct tomoyo_path_acl {
 354         struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_PATH_ACL */
 355         u16 perm; /* Bitmask of values in "enum tomoyo_path_acl_index". */
 356         struct tomoyo_name_union name;
 357 };
 358
 359 /*
 360  * Structure for "file create", "file mkdir", "file mkfifo", "file mksock",
 361  * "file ioctl", "file chmod", "file chown" and "file chgrp" directive.
 362  */
 363 struct tomoyo_path_number_acl {
 364         struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_PATH_NUMBER_ACL */
 365         /* Bitmask of values in "enum tomoyo_path_number_acl_index". */
 366         u8 perm;
 367         struct tomoyo_name_union name;
 368         struct tomoyo_number_union number;
 369 };
 370
 371 /* Structure for "file mkblock" and "file mkchar" directive. */
 372 struct tomoyo_mkdev_acl {
 373         struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_MKDEV_ACL */
 374         u8 perm; /* Bitmask of values in "enum tomoyo_mkdev_acl_index". */
 375         struct tomoyo_name_union name;
 376         struct tomoyo_number_union mode;
 377         struct tomoyo_number_union major;
 378         struct tomoyo_number_union minor;
 379 };
 380
 381 /*
 382  * Structure for "file rename", "file link" and "file pivot_root" directive.
 383  */
 384 struct tomoyo_path2_acl {
 385         struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_PATH2_ACL */
 386         u8 perm; /* Bitmask of values in "enum tomoyo_path2_acl_index". */
 387         struct tomoyo_name_union name1;
 388         struct tomoyo_name_union name2;
 389 };
 390
 391 /* Structure for "file mount" directive. */
 392 struct tomoyo_mount_acl {
 393         struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_MOUNT_ACL */
 394         struct tomoyo_name_union dev_name;
 395         struct tomoyo_name_union dir_name;
 396         struct tomoyo_name_union fs_type;
 397         struct tomoyo_number_union flags;
 398 };
 399
 400 #define TOMOYO_MAX_IO_READ_QUEUE 32
 401
 402 /*
 403  * Structure for reading/writing policy via /sys/kernel/security/tomoyo
 404  * interfaces.
 405  */
 406 struct tomoyo_io_buffer {
 407         void (*read) (struct tomoyo_io_buffer *);
 408         int (*write) (struct tomoyo_io_buffer *);
 409         int (*poll) (struct file *file, poll_table *wait);
 410         /* Exclusive lock for this structure.   */
 411         struct mutex io_sem;
 412         /* Index returned by tomoyo_read_lock(). */
 413         int reader_idx;
 414         char __user *read_user_buf;
 415         int read_user_buf_avail;
 416         struct {
 417                 struct list_head *domain;
 418                 struct list_head *group;
 419                 struct list_head *acl;
 420                 int avail;
 421                 int step;
 422                 int query_index;
 423                 u16 index;
 424                 u8 bit;
 425                 u8 w_pos;
 426                 bool eof;
 427                 bool print_this_domain_only;
 428                 bool print_execute_only;
 429                 const char *w[TOMOYO_MAX_IO_READ_QUEUE];
 430         } r;
 431         struct {
 432                 /* The position currently writing to.   */
 433                 struct tomoyo_domain_info *domain;
 434                 /* Bytes available for writing.         */
 435                 int avail;
 436         } w;
 437         /* Buffer for reading.                  */
 438         char *read_buf;
 439         /* Size of read buffer.                 */
 440         int readbuf_size;
 441         /* Buffer for writing.                  */
 442         char *write_buf;
 443         /* Size of write buffer.                */
 444         int writebuf_size;
 445         /* Type of this interface.              */
 446         u8 type;
 447 };
 448
 449 /*
 450  * Structure for "initialize_domain"/"no_initialize_domain"/"keep_domain"/
 451  * "no_keep_domain" keyword.
 452  */
 453 struct tomoyo_transition_control {
 454         struct tomoyo_acl_head head;
 455         u8 type; /* One of values in "enum tomoyo_transition_type".  */
 456         /* True if the domainname is tomoyo_get_last_name(). */
 457         bool is_last_name;
 458         const struct tomoyo_path_info *domainname; /* Maybe NULL */
 459         const struct tomoyo_path_info *program;    /* Maybe NULL */
 460 };
 461
 462 /* Structure for "aggregator" keyword. */
 463 struct tomoyo_aggregator {
 464         struct tomoyo_acl_head head;
 465         const struct tomoyo_path_info *original_name;
 466         const struct tomoyo_path_info *aggregated_name;
 467 };
 468
 469 /* Structure for policy manager. */
 470 struct tomoyo_manager {
 471         struct tomoyo_acl_head head;
 472         bool is_domain;  /* True if manager is a domainname. */
 473         /* A path to program or a domainname. */
 474         const struct tomoyo_path_info *manager;
 475 };
 476
 477 struct tomoyo_preference {
 478         unsigned int learning_max_entry;
 479         bool enforcing_verbose;
 480         bool learning_verbose;
 481         bool permissive_verbose;
 482 };
 483
 484 /* Structure for /sys/kernel/security/tomnoyo/profile interface. */
 485 struct tomoyo_profile {
 486         const struct tomoyo_path_info *comment;
 487         struct tomoyo_preference *learning;
 488         struct tomoyo_preference *permissive;
 489         struct tomoyo_preference *enforcing;
 490         struct tomoyo_preference preference;
 491         u8 default_config;
 492         u8 config[TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX];
 493 };
 494
 495 /********** Function prototypes. **********/
 496
 497 bool tomoyo_str_starts(char **src, const char *find);
 498 const char *tomoyo_get_exe(void);
 499 void tomoyo_normalize_line(unsigned char *buffer);
 500 void tomoyo_warn_log(struct tomoyo_request_info *r, const char *fmt, ...)
 501      __attribute__ ((format(printf, 2, 3)));
 502 void tomoyo_check_profile(void);
 503 int tomoyo_open_control(const u8 type, struct file *file);
 504 int tomoyo_close_control(struct tomoyo_io_buffer *head);
 505 int tomoyo_poll_control(struct file *file, poll_table *wait);
 506 int tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
 507                         const int buffer_len);
 508 int tomoyo_write_control(struct tomoyo_io_buffer *head,
 509                          const char __user *buffer, const int buffer_len);
 510 bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r);
 511 void tomoyo_warn_oom(const char *function);
 512 const struct tomoyo_path_info *
 513 tomoyo_compare_name_union(const struct tomoyo_path_info *name,
 514                           const struct tomoyo_name_union *ptr);
 515 bool tomoyo_compare_number_union(const unsigned long value,
 516                                  const struct tomoyo_number_union *ptr);
 517 int tomoyo_get_mode(const u8 profile, const u8 index);
 518 void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
 519         __attribute__ ((format(printf, 2, 3)));
 520 bool tomoyo_correct_domain(const unsigned char *domainname);
 521 bool tomoyo_correct_path(const char *filename);
 522 bool tomoyo_correct_word(const char *string);
 523 bool tomoyo_domain_def(const unsigned char *buffer);
 524 bool tomoyo_parse_name_union(const char *filename,
 525                              struct tomoyo_name_union *ptr);
 526 const struct tomoyo_path_info *
 527 tomoyo_path_matches_group(const struct tomoyo_path_info *pathname,
 528                           const struct tomoyo_group *group);
 529 bool tomoyo_number_matches_group(const unsigned long min,
 530                                  const unsigned long max,
 531                                  const struct tomoyo_group *group);
 532 bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename,
 533                                  const struct tomoyo_path_info *pattern);
 534 bool tomoyo_parse_number_union(char *data, struct tomoyo_number_union *num);
 535 bool tomoyo_tokenize(char *buffer, char *w[], size_t size);
 536 bool tomoyo_verbose_mode(const struct tomoyo_domain_info *domain);
 537 int tomoyo_init_request_info(struct tomoyo_request_info *r,
 538                              struct tomoyo_domain_info *domain,
 539                              const u8 index);
 540 int tomoyo_mount_permission(char *dev_name, struct path *path,
 541                             const char *type, unsigned long flags,
 542                             void *data_page);
 543 int tomoyo_write_aggregator(char *data, const bool is_delete);
 544 int tomoyo_write_transition_control(char *data, const bool is_delete,
 545                                     const u8 type);
 546 int tomoyo_write_file(char *data, struct tomoyo_domain_info *domain,
 547                       const bool is_delete);
 548 int tomoyo_write_mount(char *data, struct tomoyo_domain_info *domain,
 549                        const bool is_delete);
 550 int tomoyo_write_group(char *data, const bool is_delete, const u8 type);
 551 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
 552      __attribute__ ((format(printf, 2, 3)));
 553 struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname);
 554 struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname,
 555                                                 const u8 profile);
 556 struct tomoyo_profile *tomoyo_profile(const u8 profile);
 557 struct tomoyo_group *tomoyo_get_group(const char *group_name, const u8 type);
 558 unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain,
 559                                 const u8 index);
 560 void tomoyo_fill_path_info(struct tomoyo_path_info *ptr);
 561 void tomoyo_load_policy(const char *filename);
 562 void tomoyo_put_number_union(struct tomoyo_number_union *ptr);
 563 char *tomoyo_encode(const char *str);
 564 char *tomoyo_realpath_nofollow(const char *pathname);
 565 char *tomoyo_realpath_from_path(struct path *path);
 566 bool tomoyo_memory_ok(void *ptr);
 567 void *tomoyo_commit_ok(void *data, const unsigned int size);
 568 const struct tomoyo_path_info *tomoyo_get_name(const char *name);
 569 void tomoyo_read_memory_counter(struct tomoyo_io_buffer *head);
 570 int tomoyo_write_memory_quota(struct tomoyo_io_buffer *head);
 571 void __init tomoyo_mm_init(void);
 572 int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation,
 573                            const struct tomoyo_path_info *filename);
 574 int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
 575                                  struct path *path, const int flag);
 576 int tomoyo_path_number_perm(const u8 operation, struct path *path,
 577                             unsigned long number);
 578 int tomoyo_mkdev_perm(const u8 operation, struct path *path,
 579                       const unsigned int mode, unsigned int dev);
 580 int tomoyo_path_perm(const u8 operation, struct path *path);
 581 int tomoyo_path2_perm(const u8 operation, struct path *path1,
 582                       struct path *path2);
 583 int tomoyo_find_next_domain(struct linux_binprm *bprm);
 584 void tomoyo_print_ulong(char *buffer, const int buffer_len,
 585                         const unsigned long value, const u8 type);
 586 void tomoyo_put_name_union(struct tomoyo_name_union *ptr);
 587 void tomoyo_run_gc(void);
 588 void tomoyo_memory_free(void *ptr);
 589 int tomoyo_update_domain(struct tomoyo_acl_info *new_entry, const int size,
 590                          bool is_delete, struct tomoyo_domain_info *domain,
 591                          bool (*check_duplicate) (const struct tomoyo_acl_info
 592                                                   *,
 593                                                   const struct tomoyo_acl_info
 594                                                   *),
 595                          bool (*merge_duplicate) (struct tomoyo_acl_info *,
 596                                                   struct tomoyo_acl_info *,
 597                                                   const bool));
 598 int tomoyo_update_policy(struct tomoyo_acl_head *new_entry, const int size,
 599                          bool is_delete, struct list_head *list,
 600                          bool (*check_duplicate) (const struct tomoyo_acl_head
 601                                                   *,
 602                                                   const struct tomoyo_acl_head
 603                                                   *));
 604 void tomoyo_check_acl(struct tomoyo_request_info *r,
 605                       bool (*check_entry) (struct tomoyo_request_info *,
 606                                            const struct tomoyo_acl_info *));
 607
 608 /********** External variable definitions. **********/
 609
 610 /* Lock for GC. */
 611 extern struct srcu_struct tomoyo_ss;
 612
 613 /* The list for "struct tomoyo_domain_info". */
 614 extern struct list_head tomoyo_domain_list;
 615
 616 extern struct list_head tomoyo_policy_list[TOMOYO_MAX_POLICY];
 617 extern struct list_head tomoyo_group_list[TOMOYO_MAX_GROUP];
 618 extern struct list_head tomoyo_name_list[TOMOYO_MAX_HASH];
 619
 620 /* Lock for protecting policy. */
 621 extern struct mutex tomoyo_policy_lock;
 622
 623 /* Has /sbin/init started? */
 624 extern bool tomoyo_policy_loaded;
 625
 626 /* The kernel's domain. */
 627 extern struct tomoyo_domain_info tomoyo_kernel_domain;
 628
 629 extern const char *tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION];
 630 extern const char *tomoyo_mkdev_keyword[TOMOYO_MAX_MKDEV_OPERATION];
 631 extern const char *tomoyo_path2_keyword[TOMOYO_MAX_PATH2_OPERATION];
 632 extern const char *tomoyo_path_number_keyword[TOMOYO_MAX_PATH_NUMBER_OPERATION];
 633
 634 extern unsigned int tomoyo_quota_for_query;
 635 extern unsigned int tomoyo_query_memory_size;
 636
 637 /********** Inlined functions. **********/
 638
 639 /**
 640  * tomoyo_read_lock - Take lock for protecting policy.
 641  *
 642  * Returns index number for tomoyo_read_unlock().
 643  */
 644 static inline int tomoyo_read_lock(void)
 645 {
 646         return srcu_read_lock(&tomoyo_ss);
 647 }
 648
 649 /**
 650  * tomoyo_read_unlock - Release lock for protecting policy.
 651  *
 652  * @idx: Index number returned by tomoyo_read_lock().
 653  *
 654  * Returns nothing.
 655  */
 656 static inline void tomoyo_read_unlock(int idx)
 657 {
 658         srcu_read_unlock(&tomoyo_ss, idx);
 659 }
 660
 661 /**
 662  * tomoyo_pathcmp - strcmp() for "struct tomoyo_path_info" structure.
 663  *
 664  * @a: Pointer to "struct tomoyo_path_info".
 665  * @b: Pointer to "struct tomoyo_path_info".
 666  *
 667  * Returns true if @a == @b, false otherwise.
 668  */
 669 static inline bool tomoyo_pathcmp(const struct tomoyo_path_info *a,
 670                                   const struct tomoyo_path_info *b)
 671 {
 672         return a->hash != b->hash || strcmp(a->name, b->name);
 673 }
 674
 675 /**
 676  * tomoyo_put_name - Drop reference on "struct tomoyo_name".
 677  *
 678  * @name: Pointer to "struct tomoyo_path_info". Maybe NULL.
 679  *
 680  * Returns nothing.
 681  */
 682 static inline void tomoyo_put_name(const struct tomoyo_path_info *name)
 683 {
 684         if (name) {
 685                 struct tomoyo_name *ptr =
 686                         container_of(name, typeof(*ptr), entry);
 687                 atomic_dec(&ptr->head.users);
 688         }
 689 }
 690
 691 /**
 692  * tomoyo_put_group - Drop reference on "struct tomoyo_group".
 693  *
 694  * @group: Pointer to "struct tomoyo_group". Maybe NULL.
 695  *
 696  * Returns nothing.
 697  */
 698 static inline void tomoyo_put_group(struct tomoyo_group *group)
 699 {
 700         if (group)
 701                 atomic_dec(&group->head.users);
 702 }
 703
 704 /**
 705  * tomoyo_domain - Get "struct tomoyo_domain_info" for current thread.
 706  *
 707  * Returns pointer to "struct tomoyo_domain_info" for current thread.
 708  */
 709 static inline struct tomoyo_domain_info *tomoyo_domain(void)
 710 {
 711         return current_cred()->security;
 712 }
 713
 714 /**
 715  * tomoyo_real_domain - Get "struct tomoyo_domain_info" for specified thread.
 716  *
 717  * @task: Pointer to "struct task_struct".
 718  *
 719  * Returns pointer to "struct tomoyo_security" for specified thread.
 720  */
 721 static inline struct tomoyo_domain_info *tomoyo_real_domain(struct task_struct
 722                                                             *task)
 723 {
 724         return task_cred_xxx(task, security);
 725 }
 726
 727 /**
 728  * tomoyo_same_name_union - Check for duplicated "struct tomoyo_name_union" entry.
 729  *
 730  * @a: Pointer to "struct tomoyo_name_union".
 731  * @b: Pointer to "struct tomoyo_name_union".
 732  *
 733  * Returns true if @a == @b, false otherwise.
 734  */
 735 static inline bool tomoyo_same_name_union
 736 (const struct tomoyo_name_union *a, const struct tomoyo_name_union *b)
 737 {
 738         return a->filename == b->filename && a->group == b->group;
 739 }
 740
 741 /**
 742  * tomoyo_same_number_union - Check for duplicated "struct tomoyo_number_union" entry.
 743  *
 744  * @a: Pointer to "struct tomoyo_number_union".
 745  * @b: Pointer to "struct tomoyo_number_union".
 746  *
 747  * Returns true if @a == @b, false otherwise.
 748  */
 749 static inline bool tomoyo_same_number_union
 750 (const struct tomoyo_number_union *a, const struct tomoyo_number_union *b)
 751 {
 752         return a->values[0] == b->values[0] && a->values[1] == b->values[1] &&
 753                 a->group == b->group && a->value_type[0] == b->value_type[0] &&
 754                 a->value_type[1] == b->value_type[1];
 755 }
 756
 757 /**
 758  * list_for_each_cookie - iterate over a list with cookie.
 759  * @pos:        the &struct list_head to use as a loop cursor.
 760  * @head:       the head for your list.
 761  */
 762 #define list_for_each_cookie(pos, head)                                 \
 763         if (!pos)                                                       \
 764                 pos =  srcu_dereference((head)->next, &tomoyo_ss);      \
 765         for ( ; pos != (head); pos = srcu_dereference(pos->next, &tomoyo_ss))
 766
 767 #endif /* !defined(_SECURITY_TOMOYO_COMMON_H) */