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 #include <linux/binfmts.h>
  25 #include <linux/highmem.h>
  26
  27 /********** Constants definitions. **********/
  28
  29 /*
  30  * TOMOYO uses this hash only when appending a string into the string
  31  * table. Frequency of appending strings is very low. So we don't need
  32  * large (e.g. 64k) hash size. 256 will be sufficient.
  33  */
  34 #define TOMOYO_HASH_BITS  8
  35 #define TOMOYO_MAX_HASH (1u<<TOMOYO_HASH_BITS)
  36
  37 #define TOMOYO_EXEC_TMPSIZE     4096
  38
  39 /* Profile number is an integer between 0 and 255. */
  40 #define TOMOYO_MAX_PROFILES 256
  41
  42 /* Group number is an integer between 0 and 255. */
  43 #define TOMOYO_MAX_ACL_GROUPS 256
  44
  45 /* Index numbers for "struct tomoyo_condition". */
  46 enum tomoyo_conditions_index {
  47         TOMOYO_TASK_UID,             /* current_uid()   */
  48         TOMOYO_TASK_EUID,            /* current_euid()  */
  49         TOMOYO_TASK_SUID,            /* current_suid()  */
  50         TOMOYO_TASK_FSUID,           /* current_fsuid() */
  51         TOMOYO_TASK_GID,             /* current_gid()   */
  52         TOMOYO_TASK_EGID,            /* current_egid()  */
  53         TOMOYO_TASK_SGID,            /* current_sgid()  */
  54         TOMOYO_TASK_FSGID,           /* current_fsgid() */
  55         TOMOYO_TASK_PID,             /* sys_getpid()   */
  56         TOMOYO_TASK_PPID,            /* sys_getppid()  */
  57         TOMOYO_TYPE_IS_SOCKET,       /* S_IFSOCK */
  58         TOMOYO_TYPE_IS_SYMLINK,      /* S_IFLNK */
  59         TOMOYO_TYPE_IS_FILE,         /* S_IFREG */
  60         TOMOYO_TYPE_IS_BLOCK_DEV,    /* S_IFBLK */
  61         TOMOYO_TYPE_IS_DIRECTORY,    /* S_IFDIR */
  62         TOMOYO_TYPE_IS_CHAR_DEV,     /* S_IFCHR */
  63         TOMOYO_TYPE_IS_FIFO,         /* S_IFIFO */
  64         TOMOYO_MODE_SETUID,          /* S_ISUID */
  65         TOMOYO_MODE_SETGID,          /* S_ISGID */
  66         TOMOYO_MODE_STICKY,          /* S_ISVTX */
  67         TOMOYO_MODE_OWNER_READ,      /* S_IRUSR */
  68         TOMOYO_MODE_OWNER_WRITE,     /* S_IWUSR */
  69         TOMOYO_MODE_OWNER_EXECUTE,   /* S_IXUSR */
  70         TOMOYO_MODE_GROUP_READ,      /* S_IRGRP */
  71         TOMOYO_MODE_GROUP_WRITE,     /* S_IWGRP */
  72         TOMOYO_MODE_GROUP_EXECUTE,   /* S_IXGRP */
  73         TOMOYO_MODE_OTHERS_READ,     /* S_IROTH */
  74         TOMOYO_MODE_OTHERS_WRITE,    /* S_IWOTH */
  75         TOMOYO_MODE_OTHERS_EXECUTE,  /* S_IXOTH */
  76         TOMOYO_EXEC_REALPATH,
  77         TOMOYO_SYMLINK_TARGET,
  78         TOMOYO_PATH1_UID,
  79         TOMOYO_PATH1_GID,
  80         TOMOYO_PATH1_INO,
  81         TOMOYO_PATH1_MAJOR,
  82         TOMOYO_PATH1_MINOR,
  83         TOMOYO_PATH1_PERM,
  84         TOMOYO_PATH1_TYPE,
  85         TOMOYO_PATH1_DEV_MAJOR,
  86         TOMOYO_PATH1_DEV_MINOR,
  87         TOMOYO_PATH2_UID,
  88         TOMOYO_PATH2_GID,
  89         TOMOYO_PATH2_INO,
  90         TOMOYO_PATH2_MAJOR,
  91         TOMOYO_PATH2_MINOR,
  92         TOMOYO_PATH2_PERM,
  93         TOMOYO_PATH2_TYPE,
  94         TOMOYO_PATH2_DEV_MAJOR,
  95         TOMOYO_PATH2_DEV_MINOR,
  96         TOMOYO_PATH1_PARENT_UID,
  97         TOMOYO_PATH1_PARENT_GID,
  98         TOMOYO_PATH1_PARENT_INO,
  99         TOMOYO_PATH1_PARENT_PERM,
 100         TOMOYO_PATH2_PARENT_UID,
 101         TOMOYO_PATH2_PARENT_GID,
 102         TOMOYO_PATH2_PARENT_INO,
 103         TOMOYO_PATH2_PARENT_PERM,
 104         TOMOYO_MAX_CONDITION_KEYWORD,
 105         TOMOYO_NUMBER_UNION,
 106         TOMOYO_NAME_UNION,
 107 };
 108
 109
 110 /* Index numbers for stat(). */
 111 enum tomoyo_path_stat_index {
 112         /* Do not change this order. */
 113         TOMOYO_PATH1,
 114         TOMOYO_PATH1_PARENT,
 115         TOMOYO_PATH2,
 116         TOMOYO_PATH2_PARENT,
 117         TOMOYO_MAX_PATH_STAT
 118 };
 119
 120 /* Index numbers for operation mode. */
 121 enum tomoyo_mode_index {
 122         TOMOYO_CONFIG_DISABLED,
 123         TOMOYO_CONFIG_LEARNING,
 124         TOMOYO_CONFIG_PERMISSIVE,
 125         TOMOYO_CONFIG_ENFORCING,
 126         TOMOYO_CONFIG_MAX_MODE,
 127         TOMOYO_CONFIG_WANT_REJECT_LOG =  64,
 128         TOMOYO_CONFIG_WANT_GRANT_LOG  = 128,
 129         TOMOYO_CONFIG_USE_DEFAULT     = 255,
 130 };
 131
 132 /* Index numbers for entry type. */
 133 enum tomoyo_policy_id {
 134         TOMOYO_ID_GROUP,
 135         TOMOYO_ID_PATH_GROUP,
 136         TOMOYO_ID_NUMBER_GROUP,
 137         TOMOYO_ID_TRANSITION_CONTROL,
 138         TOMOYO_ID_AGGREGATOR,
 139         TOMOYO_ID_MANAGER,
 140         TOMOYO_ID_CONDITION,
 141         TOMOYO_ID_NAME,
 142         TOMOYO_ID_ACL,
 143         TOMOYO_ID_DOMAIN,
 144         TOMOYO_MAX_POLICY
 145 };
 146
 147 /* Index numbers for domain's attributes. */
 148 enum tomoyo_domain_info_flags_index {
 149         /* Quota warnning flag.   */
 150         TOMOYO_DIF_QUOTA_WARNED,
 151         /*
 152          * This domain was unable to create a new domain at
 153          * tomoyo_find_next_domain() because the name of the domain to be
 154          * created was too long or it could not allocate memory.
 155          * More than one process continued execve() without domain transition.
 156          */
 157         TOMOYO_DIF_TRANSITION_FAILED,
 158         TOMOYO_MAX_DOMAIN_INFO_FLAGS
 159 };
 160
 161 /* Index numbers for group entries. */
 162 enum tomoyo_group_id {
 163         TOMOYO_PATH_GROUP,
 164         TOMOYO_NUMBER_GROUP,
 165         TOMOYO_MAX_GROUP
 166 };
 167
 168 /* Index numbers for type of numeric values. */
 169 enum tomoyo_value_type {
 170         TOMOYO_VALUE_TYPE_INVALID,
 171         TOMOYO_VALUE_TYPE_DECIMAL,
 172         TOMOYO_VALUE_TYPE_OCTAL,
 173         TOMOYO_VALUE_TYPE_HEXADECIMAL,
 174 };
 175
 176 /* Index numbers for domain transition control keywords. */
 177 enum tomoyo_transition_type {
 178         /* Do not change this order, */
 179         TOMOYO_TRANSITION_CONTROL_NO_RESET,
 180         TOMOYO_TRANSITION_CONTROL_RESET,
 181         TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE,
 182         TOMOYO_TRANSITION_CONTROL_INITIALIZE,
 183         TOMOYO_TRANSITION_CONTROL_NO_KEEP,
 184         TOMOYO_TRANSITION_CONTROL_KEEP,
 185         TOMOYO_MAX_TRANSITION_TYPE
 186 };
 187
 188 /* Index numbers for Access Controls. */
 189 enum tomoyo_acl_entry_type_index {
 190         TOMOYO_TYPE_PATH_ACL,
 191         TOMOYO_TYPE_PATH2_ACL,
 192         TOMOYO_TYPE_PATH_NUMBER_ACL,
 193         TOMOYO_TYPE_MKDEV_ACL,
 194         TOMOYO_TYPE_MOUNT_ACL,
 195 };
 196
 197 /* Index numbers for access controls with one pathname. */
 198 enum tomoyo_path_acl_index {
 199         TOMOYO_TYPE_EXECUTE,
 200         TOMOYO_TYPE_READ,
 201         TOMOYO_TYPE_WRITE,
 202         TOMOYO_TYPE_APPEND,
 203         TOMOYO_TYPE_UNLINK,
 204         TOMOYO_TYPE_GETATTR,
 205         TOMOYO_TYPE_RMDIR,
 206         TOMOYO_TYPE_TRUNCATE,
 207         TOMOYO_TYPE_SYMLINK,
 208         TOMOYO_TYPE_CHROOT,
 209         TOMOYO_TYPE_UMOUNT,
 210         TOMOYO_MAX_PATH_OPERATION
 211 };
 212
 213 /* Index numbers for /sys/kernel/security/tomoyo/stat interface. */
 214 enum tomoyo_memory_stat_type {
 215         TOMOYO_MEMORY_POLICY,
 216         TOMOYO_MEMORY_AUDIT,
 217         TOMOYO_MEMORY_QUERY,
 218         TOMOYO_MAX_MEMORY_STAT
 219 };
 220
 221 enum tomoyo_mkdev_acl_index {
 222         TOMOYO_TYPE_MKBLOCK,
 223         TOMOYO_TYPE_MKCHAR,
 224         TOMOYO_MAX_MKDEV_OPERATION
 225 };
 226
 227 /* Index numbers for access controls with two pathnames. */
 228 enum tomoyo_path2_acl_index {
 229         TOMOYO_TYPE_LINK,
 230         TOMOYO_TYPE_RENAME,
 231         TOMOYO_TYPE_PIVOT_ROOT,
 232         TOMOYO_MAX_PATH2_OPERATION
 233 };
 234
 235 /* Index numbers for access controls with one pathname and one number. */
 236 enum tomoyo_path_number_acl_index {
 237         TOMOYO_TYPE_CREATE,
 238         TOMOYO_TYPE_MKDIR,
 239         TOMOYO_TYPE_MKFIFO,
 240         TOMOYO_TYPE_MKSOCK,
 241         TOMOYO_TYPE_IOCTL,
 242         TOMOYO_TYPE_CHMOD,
 243         TOMOYO_TYPE_CHOWN,
 244         TOMOYO_TYPE_CHGRP,
 245         TOMOYO_MAX_PATH_NUMBER_OPERATION
 246 };
 247
 248 /* Index numbers for /sys/kernel/security/tomoyo/ interfaces. */
 249 enum tomoyo_securityfs_interface_index {
 250         TOMOYO_DOMAINPOLICY,
 251         TOMOYO_EXCEPTIONPOLICY,
 252         TOMOYO_PROCESS_STATUS,
 253         TOMOYO_STAT,
 254         TOMOYO_SELFDOMAIN,
 255         TOMOYO_AUDIT,
 256         TOMOYO_VERSION,
 257         TOMOYO_PROFILE,
 258         TOMOYO_QUERY,
 259         TOMOYO_MANAGER
 260 };
 261
 262 /* Index numbers for special mount operations. */
 263 enum tomoyo_special_mount {
 264         TOMOYO_MOUNT_BIND,            /* mount --bind /source /dest   */
 265         TOMOYO_MOUNT_MOVE,            /* mount --move /old /new       */
 266         TOMOYO_MOUNT_REMOUNT,         /* mount -o remount /dir        */
 267         TOMOYO_MOUNT_MAKE_UNBINDABLE, /* mount --make-unbindable /dir */
 268         TOMOYO_MOUNT_MAKE_PRIVATE,    /* mount --make-private /dir    */
 269         TOMOYO_MOUNT_MAKE_SLAVE,      /* mount --make-slave /dir      */
 270         TOMOYO_MOUNT_MAKE_SHARED,     /* mount --make-shared /dir     */
 271         TOMOYO_MAX_SPECIAL_MOUNT
 272 };
 273
 274 /* Index numbers for functionality. */
 275 enum tomoyo_mac_index {
 276         TOMOYO_MAC_FILE_EXECUTE,
 277         TOMOYO_MAC_FILE_OPEN,
 278         TOMOYO_MAC_FILE_CREATE,
 279         TOMOYO_MAC_FILE_UNLINK,
 280         TOMOYO_MAC_FILE_GETATTR,
 281         TOMOYO_MAC_FILE_MKDIR,
 282         TOMOYO_MAC_FILE_RMDIR,
 283         TOMOYO_MAC_FILE_MKFIFO,
 284         TOMOYO_MAC_FILE_MKSOCK,
 285         TOMOYO_MAC_FILE_TRUNCATE,
 286         TOMOYO_MAC_FILE_SYMLINK,
 287         TOMOYO_MAC_FILE_MKBLOCK,
 288         TOMOYO_MAC_FILE_MKCHAR,
 289         TOMOYO_MAC_FILE_LINK,
 290         TOMOYO_MAC_FILE_RENAME,
 291         TOMOYO_MAC_FILE_CHMOD,
 292         TOMOYO_MAC_FILE_CHOWN,
 293         TOMOYO_MAC_FILE_CHGRP,
 294         TOMOYO_MAC_FILE_IOCTL,
 295         TOMOYO_MAC_FILE_CHROOT,
 296         TOMOYO_MAC_FILE_MOUNT,
 297         TOMOYO_MAC_FILE_UMOUNT,
 298         TOMOYO_MAC_FILE_PIVOT_ROOT,
 299         TOMOYO_MAX_MAC_INDEX
 300 };
 301
 302 /* Index numbers for category of functionality. */
 303 enum tomoyo_mac_category_index {
 304         TOMOYO_MAC_CATEGORY_FILE,
 305         TOMOYO_MAX_MAC_CATEGORY_INDEX
 306 };
 307
 308 /*
 309  * Retry this request. Returned by tomoyo_supervisor() if policy violation has
 310  * occurred in enforcing mode and the userspace daemon decided to retry.
 311  *
 312  * We must choose a positive value in order to distinguish "granted" (which is
 313  * 0) and "rejected" (which is a negative value) and "retry".
 314  */
 315 #define TOMOYO_RETRY_REQUEST 1
 316
 317 /* Index numbers for /sys/kernel/security/tomoyo/stat interface. */
 318 enum tomoyo_policy_stat_type {
 319         /* Do not change this order. */
 320         TOMOYO_STAT_POLICY_UPDATES,
 321         TOMOYO_STAT_POLICY_LEARNING,   /* == TOMOYO_CONFIG_LEARNING */
 322         TOMOYO_STAT_POLICY_PERMISSIVE, /* == TOMOYO_CONFIG_PERMISSIVE */
 323         TOMOYO_STAT_POLICY_ENFORCING,  /* == TOMOYO_CONFIG_ENFORCING */
 324         TOMOYO_MAX_POLICY_STAT
 325 };
 326
 327 /* Index numbers for profile's PREFERENCE values. */
 328 enum tomoyo_pref_index {
 329         TOMOYO_PREF_MAX_AUDIT_LOG,
 330         TOMOYO_PREF_MAX_LEARNING_ENTRY,
 331         TOMOYO_MAX_PREF
 332 };
 333
 334 /********** Structure definitions. **********/
 335
 336 /* Common header for holding ACL entries. */
 337 struct tomoyo_acl_head {
 338         struct list_head list;
 339         bool is_deleted;
 340 } __packed;
 341
 342 /* Common header for shared entries. */
 343 struct tomoyo_shared_acl_head {
 344         struct list_head list;
 345         atomic_t users;
 346 } __packed;
 347
 348 struct tomoyo_policy_namespace;
 349
 350 /* Structure for request info. */
 351 struct tomoyo_request_info {
 352         /*
 353          * For holding parameters specific to operations which deal files.
 354          * NULL if not dealing files.
 355          */
 356         struct tomoyo_obj_info *obj;
 357         /*
 358          * For holding parameters specific to execve() request.
 359          * NULL if not dealing do_execve().
 360          */
 361         struct tomoyo_execve *ee;
 362         struct tomoyo_domain_info *domain;
 363         /* For holding parameters. */
 364         union {
 365                 struct {
 366                         const struct tomoyo_path_info *filename;
 367                         /* For using wildcards at tomoyo_find_next_domain(). */
 368                         const struct tomoyo_path_info *matched_path;
 369                         /* One of values in "enum tomoyo_path_acl_index". */
 370                         u8 operation;
 371                 } path;
 372                 struct {
 373                         const struct tomoyo_path_info *filename1;
 374                         const struct tomoyo_path_info *filename2;
 375                         /* One of values in "enum tomoyo_path2_acl_index". */
 376                         u8 operation;
 377                 } path2;
 378                 struct {
 379                         const struct tomoyo_path_info *filename;
 380                         unsigned int mode;
 381                         unsigned int major;
 382                         unsigned int minor;
 383                         /* One of values in "enum tomoyo_mkdev_acl_index". */
 384                         u8 operation;
 385                 } mkdev;
 386                 struct {
 387                         const struct tomoyo_path_info *filename;
 388                         unsigned long number;
 389                         /*
 390                          * One of values in
 391                          * "enum tomoyo_path_number_acl_index".
 392                          */
 393                         u8 operation;
 394                 } path_number;
 395                 struct {
 396                         const struct tomoyo_path_info *type;
 397                         const struct tomoyo_path_info *dir;
 398                         const struct tomoyo_path_info *dev;
 399                         unsigned long flags;
 400                         int need_dev;
 401                 } mount;
 402         } param;
 403         u8 param_type;
 404         bool granted;
 405         u8 retry;
 406         u8 profile;
 407         u8 mode; /* One of tomoyo_mode_index . */
 408         u8 type;
 409 };
 410
 411 /* Structure for holding a token. */
 412 struct tomoyo_path_info {
 413         const char *name;
 414         u32 hash;          /* = full_name_hash(name, strlen(name)) */
 415         u16 const_len;     /* = tomoyo_const_part_length(name)     */
 416         bool is_dir;       /* = tomoyo_strendswith(name, "/")      */
 417         bool is_patterned; /* = tomoyo_path_contains_pattern(name) */
 418 };
 419
 420 /* Structure for holding string data. */
 421 struct tomoyo_name {
 422         struct tomoyo_shared_acl_head head;
 423         struct tomoyo_path_info entry;
 424 };
 425
 426 /* Structure for holding a word. */
 427 struct tomoyo_name_union {
 428         /* Either @filename or @group is NULL. */
 429         const struct tomoyo_path_info *filename;
 430         struct tomoyo_group *group;
 431 };
 432
 433 /* Structure for holding a number. */
 434 struct tomoyo_number_union {
 435         unsigned long values[2];
 436         struct tomoyo_group *group; /* Maybe NULL. */
 437         /* One of values in "enum tomoyo_value_type". */
 438         u8 value_type[2];
 439 };
 440
 441 /* Structure for "path_group"/"number_group" directive. */
 442 struct tomoyo_group {
 443         struct tomoyo_shared_acl_head head;
 444         const struct tomoyo_path_info *group_name;
 445         struct list_head member_list;
 446 };
 447
 448 /* Structure for "path_group" directive. */
 449 struct tomoyo_path_group {
 450         struct tomoyo_acl_head head;
 451         const struct tomoyo_path_info *member_name;
 452 };
 453
 454 /* Structure for "number_group" directive. */
 455 struct tomoyo_number_group {
 456         struct tomoyo_acl_head head;
 457         struct tomoyo_number_union number;
 458 };
 459
 460 /* Subset of "struct stat". Used by conditional ACL and audit logs. */
 461 struct tomoyo_mini_stat {
 462         uid_t uid;
 463         gid_t gid;
 464         ino_t ino;
 465         mode_t mode;
 466         dev_t dev;
 467         dev_t rdev;
 468 };
 469
 470 /* Structure for attribute checks in addition to pathname checks. */
 471 struct tomoyo_obj_info {
 472         /*
 473          * True if tomoyo_get_attributes() was already called, false otherwise.
 474          */
 475         bool validate_done;
 476         /* True if @stat[] is valid. */
 477         bool stat_valid[TOMOYO_MAX_PATH_STAT];
 478         /* First pathname. Initialized with { NULL, NULL } if no path. */
 479         struct path path1;
 480         /* Second pathname. Initialized with { NULL, NULL } if no path. */
 481         struct path path2;
 482         /*
 483          * Information on @path1, @path1's parent directory, @path2, @path2's
 484          * parent directory.
 485          */
 486         struct tomoyo_mini_stat stat[TOMOYO_MAX_PATH_STAT];
 487         /*
 488          * Content of symbolic link to be created. NULL for operations other
 489          * than symlink().
 490          */
 491         struct tomoyo_path_info *symlink_target;
 492 };
 493
 494 /* Structure for execve() operation. */
 495 struct tomoyo_execve {
 496         struct tomoyo_request_info r;
 497         struct tomoyo_obj_info obj;
 498         struct linux_binprm *bprm;
 499         /* For temporary use. */
 500         char *tmp; /* Size is TOMOYO_EXEC_TMPSIZE bytes */
 501 };
 502
 503 /* Structure for entries which follows "struct tomoyo_condition". */
 504 struct tomoyo_condition_element {
 505         /* Left hand operand. */
 506         u8 left;
 507         /* Right hand operand. */
 508         u8 right;
 509         /* Equation operator. True if equals or overlaps, false otherwise. */
 510         bool equals;
 511 };
 512
 513 /* Structure for optional arguments. */
 514 struct tomoyo_condition {
 515         struct tomoyo_shared_acl_head head;
 516         u32 size; /* Memory size allocated for this entry. */
 517         u16 condc; /* Number of conditions in this struct. */
 518         u16 numbers_count; /* Number of "struct tomoyo_number_union values". */
 519         u16 names_count; /* Number of "struct tomoyo_name_union names". */
 520         /*
 521          * struct tomoyo_condition_element condition[condc];
 522          * struct tomoyo_number_union values[numbers_count];
 523          * struct tomoyo_name_union names[names_count];
 524          */
 525 };
 526
 527 /* Common header for individual entries. */
 528 struct tomoyo_acl_info {
 529         struct list_head list;
 530         struct tomoyo_condition *cond; /* Maybe NULL. */
 531         bool is_deleted;
 532         u8 type; /* One of values in "enum tomoyo_acl_entry_type_index". */
 533 } __packed;
 534
 535 /* Structure for domain information. */
 536 struct tomoyo_domain_info {
 537         struct list_head list;
 538         struct list_head acl_info_list;
 539         /* Name of this domain. Never NULL.          */
 540         const struct tomoyo_path_info *domainname;
 541         /* Namespace for this domain. Never NULL. */
 542         struct tomoyo_policy_namespace *ns;
 543         u8 profile;        /* Profile number to use. */
 544         u8 group;          /* Group number to use.   */
 545         bool is_deleted;   /* Delete flag.           */
 546         bool flags[TOMOYO_MAX_DOMAIN_INFO_FLAGS];
 547         atomic_t users; /* Number of referring credentials. */
 548 };
 549
 550 /*
 551  * Structure for "file execute", "file read", "file write", "file append",
 552  * "file unlink", "file getattr", "file rmdir", "file truncate",
 553  * "file symlink", "file chroot" and "file unmount" directive.
 554  */
 555 struct tomoyo_path_acl {
 556         struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_PATH_ACL */
 557         u16 perm; /* Bitmask of values in "enum tomoyo_path_acl_index". */
 558         struct tomoyo_name_union name;
 559 };
 560
 561 /*
 562  * Structure for "file create", "file mkdir", "file mkfifo", "file mksock",
 563  * "file ioctl", "file chmod", "file chown" and "file chgrp" directive.
 564  */
 565 struct tomoyo_path_number_acl {
 566         struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_PATH_NUMBER_ACL */
 567         /* Bitmask of values in "enum tomoyo_path_number_acl_index". */
 568         u8 perm;
 569         struct tomoyo_name_union name;
 570         struct tomoyo_number_union number;
 571 };
 572
 573 /* Structure for "file mkblock" and "file mkchar" directive. */
 574 struct tomoyo_mkdev_acl {
 575         struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_MKDEV_ACL */
 576         u8 perm; /* Bitmask of values in "enum tomoyo_mkdev_acl_index". */
 577         struct tomoyo_name_union name;
 578         struct tomoyo_number_union mode;
 579         struct tomoyo_number_union major;
 580         struct tomoyo_number_union minor;
 581 };
 582
 583 /*
 584  * Structure for "file rename", "file link" and "file pivot_root" directive.
 585  */
 586 struct tomoyo_path2_acl {
 587         struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_PATH2_ACL */
 588         u8 perm; /* Bitmask of values in "enum tomoyo_path2_acl_index". */
 589         struct tomoyo_name_union name1;
 590         struct tomoyo_name_union name2;
 591 };
 592
 593 /* Structure for "file mount" directive. */
 594 struct tomoyo_mount_acl {
 595         struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_MOUNT_ACL */
 596         struct tomoyo_name_union dev_name;
 597         struct tomoyo_name_union dir_name;
 598         struct tomoyo_name_union fs_type;
 599         struct tomoyo_number_union flags;
 600 };
 601
 602 /* Structure for holding a line from /sys/kernel/security/tomoyo/ interface. */
 603 struct tomoyo_acl_param {
 604         char *data;
 605         struct list_head *list;
 606         struct tomoyo_policy_namespace *ns;
 607         bool is_delete;
 608 };
 609
 610 #define TOMOYO_MAX_IO_READ_QUEUE 64
 611
 612 /*
 613  * Structure for reading/writing policy via /sys/kernel/security/tomoyo
 614  * interfaces.
 615  */
 616 struct tomoyo_io_buffer {
 617         void (*read) (struct tomoyo_io_buffer *);
 618         int (*write) (struct tomoyo_io_buffer *);
 619         int (*poll) (struct file *file, poll_table *wait);
 620         /* Exclusive lock for this structure.   */
 621         struct mutex io_sem;
 622         char __user *read_user_buf;
 623         size_t read_user_buf_avail;
 624         struct {
 625                 struct list_head *ns;
 626                 struct list_head *domain;
 627                 struct list_head *group;
 628                 struct list_head *acl;
 629                 size_t avail;
 630                 unsigned int step;
 631                 unsigned int query_index;
 632                 u16 index;
 633                 u16 cond_index;
 634                 u8 acl_group_index;
 635                 u8 cond_step;
 636                 u8 bit;
 637                 u8 w_pos;
 638                 bool eof;
 639                 bool print_this_domain_only;
 640                 bool print_transition_related_only;
 641                 bool print_cond_part;
 642                 const char *w[TOMOYO_MAX_IO_READ_QUEUE];
 643         } r;
 644         struct {
 645                 struct tomoyo_policy_namespace *ns;
 646                 /* The position currently writing to.   */
 647                 struct tomoyo_domain_info *domain;
 648                 /* Bytes available for writing.         */
 649                 size_t avail;
 650                 bool is_delete;
 651         } w;
 652         /* Buffer for reading.                  */
 653         char *read_buf;
 654         /* Size of read buffer.                 */
 655         size_t readbuf_size;
 656         /* Buffer for writing.                  */
 657         char *write_buf;
 658         /* Size of write buffer.                */
 659         size_t writebuf_size;
 660         /* Type of this interface.              */
 661         enum tomoyo_securityfs_interface_index type;
 662         /* Users counter protected by tomoyo_io_buffer_list_lock. */
 663         u8 users;
 664         /* List for telling GC not to kfree() elements. */
 665         struct list_head list;
 666 };
 667
 668 /*
 669  * Structure for "initialize_domain"/"no_initialize_domain"/"keep_domain"/
 670  * "no_keep_domain" keyword.
 671  */
 672 struct tomoyo_transition_control {
 673         struct tomoyo_acl_head head;
 674         u8 type; /* One of values in "enum tomoyo_transition_type".  */
 675         /* True if the domainname is tomoyo_get_last_name(). */
 676         bool is_last_name;
 677         const struct tomoyo_path_info *domainname; /* Maybe NULL */
 678         const struct tomoyo_path_info *program;    /* Maybe NULL */
 679 };
 680
 681 /* Structure for "aggregator" keyword. */
 682 struct tomoyo_aggregator {
 683         struct tomoyo_acl_head head;
 684         const struct tomoyo_path_info *original_name;
 685         const struct tomoyo_path_info *aggregated_name;
 686 };
 687
 688 /* Structure for policy manager. */
 689 struct tomoyo_manager {
 690         struct tomoyo_acl_head head;
 691         bool is_domain;  /* True if manager is a domainname. */
 692         /* A path to program or a domainname. */
 693         const struct tomoyo_path_info *manager;
 694 };
 695
 696 struct tomoyo_preference {
 697         unsigned int learning_max_entry;
 698         bool enforcing_verbose;
 699         bool learning_verbose;
 700         bool permissive_verbose;
 701 };
 702
 703 /* Structure for /sys/kernel/security/tomnoyo/profile interface. */
 704 struct tomoyo_profile {
 705         const struct tomoyo_path_info *comment;
 706         struct tomoyo_preference *learning;
 707         struct tomoyo_preference *permissive;
 708         struct tomoyo_preference *enforcing;
 709         struct tomoyo_preference preference;
 710         u8 default_config;
 711         u8 config[TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX];
 712         unsigned int pref[TOMOYO_MAX_PREF];
 713 };
 714
 715 /* Structure for representing YYYY/MM/DD hh/mm/ss. */
 716 struct tomoyo_time {
 717         u16 year;
 718         u8 month;
 719         u8 day;
 720         u8 hour;
 721         u8 min;
 722         u8 sec;
 723 };
 724
 725 /* Structure for policy namespace. */
 726 struct tomoyo_policy_namespace {
 727         /* Profile table. Memory is allocated as needed. */
 728         struct tomoyo_profile *profile_ptr[TOMOYO_MAX_PROFILES];
 729         /* List of "struct tomoyo_group". */
 730         struct list_head group_list[TOMOYO_MAX_GROUP];
 731         /* List of policy. */
 732         struct list_head policy_list[TOMOYO_MAX_POLICY];
 733         /* The global ACL referred by "use_group" keyword. */
 734         struct list_head acl_group[TOMOYO_MAX_ACL_GROUPS];
 735         /* List for connecting to tomoyo_namespace_list list. */
 736         struct list_head namespace_list;
 737         /* Profile version. Currently only 20100903 is defined. */
 738         unsigned int profile_version;
 739         /* Name of this namespace (e.g. "<kernel>", "</usr/sbin/httpd>" ). */
 740         const char *name;
 741 };
 742
 743 /********** Function prototypes. **********/
 744
 745 bool tomoyo_compare_number_union(const unsigned long value,
 746                                  const struct tomoyo_number_union *ptr);
 747 bool tomoyo_condition(struct tomoyo_request_info *r,
 748                       const struct tomoyo_condition *cond);
 749 bool tomoyo_correct_domain(const unsigned char *domainname);
 750 bool tomoyo_correct_path(const char *filename);
 751 bool tomoyo_correct_word(const char *string);
 752 bool tomoyo_domain_def(const unsigned char *buffer);
 753 bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r);
 754 bool tomoyo_memory_ok(void *ptr);
 755 bool tomoyo_number_matches_group(const unsigned long min,
 756                                  const unsigned long max,
 757                                  const struct tomoyo_group *group);
 758 bool tomoyo_parse_name_union(struct tomoyo_acl_param *param,
 759                              struct tomoyo_name_union *ptr);
 760 bool tomoyo_parse_number_union(struct tomoyo_acl_param *param,
 761                                struct tomoyo_number_union *ptr);
 762 bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename,
 763                                  const struct tomoyo_path_info *pattern);
 764 bool tomoyo_permstr(const char *string, const char *keyword);
 765 bool tomoyo_str_starts(char **src, const char *find);
 766 char *tomoyo_encode(const char *str);
 767 char *tomoyo_init_log(struct tomoyo_request_info *r, int len, const char *fmt,
 768                       va_list args);
 769 char *tomoyo_read_token(struct tomoyo_acl_param *param);
 770 char *tomoyo_realpath_from_path(struct path *path);
 771 char *tomoyo_realpath_nofollow(const char *pathname);
 772 const char *tomoyo_get_exe(void);
 773 const char *tomoyo_yesno(const unsigned int value);
 774 const struct tomoyo_path_info *tomoyo_compare_name_union
 775 (const struct tomoyo_path_info *name, const struct tomoyo_name_union *ptr);
 776 const struct tomoyo_path_info *tomoyo_get_name(const char *name);
 777 const struct tomoyo_path_info *tomoyo_path_matches_group
 778 (const struct tomoyo_path_info *pathname, const struct tomoyo_group *group);
 779 int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
 780                                  struct path *path, const int flag);
 781 int tomoyo_close_control(struct tomoyo_io_buffer *head);
 782 int tomoyo_find_next_domain(struct linux_binprm *bprm);
 783 int tomoyo_get_mode(const struct tomoyo_policy_namespace *ns, const u8 profile,
 784                     const u8 index);
 785 int tomoyo_init_request_info(struct tomoyo_request_info *r,
 786                              struct tomoyo_domain_info *domain,
 787                              const u8 index);
 788 int tomoyo_mkdev_perm(const u8 operation, struct path *path,
 789                       const unsigned int mode, unsigned int dev);
 790 int tomoyo_mount_permission(char *dev_name, struct path *path,
 791                             const char *type, unsigned long flags,
 792                             void *data_page);
 793 int tomoyo_open_control(const u8 type, struct file *file);
 794 int tomoyo_path2_perm(const u8 operation, struct path *path1,
 795                       struct path *path2);
 796 int tomoyo_path_number_perm(const u8 operation, struct path *path,
 797                             unsigned long number);
 798 int tomoyo_path_perm(const u8 operation, struct path *path);
 799 int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation,
 800                            const struct tomoyo_path_info *filename);
 801 int tomoyo_poll_control(struct file *file, poll_table *wait);
 802 int tomoyo_poll_log(struct file *file, poll_table *wait);
 803 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
 804         __printf(2, 3);
 805 int tomoyo_update_domain(struct tomoyo_acl_info *new_entry, const int size,
 806                          struct tomoyo_acl_param *param,
 807                          bool (*check_duplicate)
 808                          (const struct tomoyo_acl_info *,
 809                           const struct tomoyo_acl_info *),
 810                          bool (*merge_duplicate)
 811                          (struct tomoyo_acl_info *, struct tomoyo_acl_info *,
 812                           const bool));
 813 int tomoyo_update_policy(struct tomoyo_acl_head *new_entry, const int size,
 814                          struct tomoyo_acl_param *param,
 815                          bool (*check_duplicate)
 816                          (const struct tomoyo_acl_head *,
 817                           const struct tomoyo_acl_head *));
 818 int tomoyo_write_aggregator(struct tomoyo_acl_param *param);
 819 int tomoyo_write_file(struct tomoyo_acl_param *param);
 820 int tomoyo_write_group(struct tomoyo_acl_param *param, const u8 type);
 821 int tomoyo_write_transition_control(struct tomoyo_acl_param *param,
 822                                     const u8 type);
 823 ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
 824                             const int buffer_len);
 825 ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
 826                              const char __user *buffer, const int buffer_len);
 827 struct tomoyo_condition *tomoyo_get_condition(struct tomoyo_acl_param *param);
 828 struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname,
 829                                                 const bool transit);
 830 struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname);
 831 struct tomoyo_group *tomoyo_get_group(struct tomoyo_acl_param *param,
 832                                       const u8 idx);
 833 struct tomoyo_policy_namespace *tomoyo_assign_namespace
 834 (const char *domainname);
 835 struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns,
 836                                       const u8 profile);
 837 unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain,
 838                                 const u8 index);
 839 u8 tomoyo_parse_ulong(unsigned long *result, char **str);
 840 void *tomoyo_commit_ok(void *data, const unsigned int size);
 841 void __init tomoyo_load_builtin_policy(void);
 842 void __init tomoyo_mm_init(void);
 843 void tomoyo_check_acl(struct tomoyo_request_info *r,
 844                       bool (*check_entry) (struct tomoyo_request_info *,
 845                                            const struct tomoyo_acl_info *));
 846 void tomoyo_check_profile(void);
 847 void tomoyo_convert_time(time_t time, struct tomoyo_time *stamp);
 848 void tomoyo_del_condition(struct list_head *element);
 849 void tomoyo_fill_path_info(struct tomoyo_path_info *ptr);
 850 void tomoyo_get_attributes(struct tomoyo_obj_info *obj);
 851 void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns);
 852 void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
 853          __printf(2, 3);
 854 void tomoyo_load_policy(const char *filename);
 855 void tomoyo_memory_free(void *ptr);
 856 void tomoyo_normalize_line(unsigned char *buffer);
 857 void tomoyo_notify_gc(struct tomoyo_io_buffer *head, const bool is_register);
 858 void tomoyo_print_ulong(char *buffer, const int buffer_len,
 859                         const unsigned long value, const u8 type);
 860 void tomoyo_put_name_union(struct tomoyo_name_union *ptr);
 861 void tomoyo_put_number_union(struct tomoyo_number_union *ptr);
 862 void tomoyo_read_log(struct tomoyo_io_buffer *head);
 863 void tomoyo_update_stat(const u8 index);
 864 void tomoyo_warn_oom(const char *function);
 865 void tomoyo_write_log(struct tomoyo_request_info *r, const char *fmt, ...)
 866         __printf(2, 3);
 867 void tomoyo_write_log2(struct tomoyo_request_info *r, int len, const char *fmt,
 868                        va_list args);
 869
 870 /********** External variable definitions. **********/
 871
 872 extern bool tomoyo_policy_loaded;
 873 extern const char * const tomoyo_condition_keyword
 874 [TOMOYO_MAX_CONDITION_KEYWORD];
 875 extern const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS];
 876 extern const char * const tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
 877                                               + TOMOYO_MAX_MAC_CATEGORY_INDEX];
 878 extern const char * const tomoyo_mode[TOMOYO_CONFIG_MAX_MODE];
 879 extern const char * const tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION];
 880 extern const u8 tomoyo_index2category[TOMOYO_MAX_MAC_INDEX];
 881 extern const u8 tomoyo_pn2mac[TOMOYO_MAX_PATH_NUMBER_OPERATION];
 882 extern const u8 tomoyo_pnnn2mac[TOMOYO_MAX_MKDEV_OPERATION];
 883 extern const u8 tomoyo_pp2mac[TOMOYO_MAX_PATH2_OPERATION];
 884 extern struct list_head tomoyo_condition_list;
 885 extern struct list_head tomoyo_domain_list;
 886 extern struct list_head tomoyo_name_list[TOMOYO_MAX_HASH];
 887 extern struct list_head tomoyo_namespace_list;
 888 extern struct mutex tomoyo_policy_lock;
 889 extern struct srcu_struct tomoyo_ss;
 890 extern struct tomoyo_domain_info tomoyo_kernel_domain;
 891 extern struct tomoyo_policy_namespace tomoyo_kernel_namespace;
 892 extern unsigned int tomoyo_memory_quota[TOMOYO_MAX_MEMORY_STAT];
 893 extern unsigned int tomoyo_memory_used[TOMOYO_MAX_MEMORY_STAT];
 894
 895 /********** Inlined functions. **********/
 896
 897 /**
 898  * tomoyo_read_lock - Take lock for protecting policy.
 899  *
 900  * Returns index number for tomoyo_read_unlock().
 901  */
 902 static inline int tomoyo_read_lock(void)
 903 {
 904         return srcu_read_lock(&tomoyo_ss);
 905 }
 906
 907 /**
 908  * tomoyo_read_unlock - Release lock for protecting policy.
 909  *
 910  * @idx: Index number returned by tomoyo_read_lock().
 911  *
 912  * Returns nothing.
 913  */
 914 static inline void tomoyo_read_unlock(int idx)
 915 {
 916         srcu_read_unlock(&tomoyo_ss, idx);
 917 }
 918
 919 /**
 920  * tomoyo_sys_getppid - Copy of getppid().
 921  *
 922  * Returns parent process's PID.
 923  *
 924  * Alpha does not have getppid() defined. To be able to build this module on
 925  * Alpha, I have to copy getppid() from kernel/timer.c.
 926  */
 927 static inline pid_t tomoyo_sys_getppid(void)
 928 {
 929         pid_t pid;
 930         rcu_read_lock();
 931         pid = task_tgid_vnr(current->real_parent);
 932         rcu_read_unlock();
 933         return pid;
 934 }
 935
 936 /**
 937  * tomoyo_sys_getpid - Copy of getpid().
 938  *
 939  * Returns current thread's PID.
 940  *
 941  * Alpha does not have getpid() defined. To be able to build this module on
 942  * Alpha, I have to copy getpid() from kernel/timer.c.
 943  */
 944 static inline pid_t tomoyo_sys_getpid(void)
 945 {
 946         return task_tgid_vnr(current);
 947 }
 948
 949 /**
 950  * tomoyo_pathcmp - strcmp() for "struct tomoyo_path_info" structure.
 951  *
 952  * @a: Pointer to "struct tomoyo_path_info".
 953  * @b: Pointer to "struct tomoyo_path_info".
 954  *
 955  * Returns true if @a == @b, false otherwise.
 956  */
 957 static inline bool tomoyo_pathcmp(const struct tomoyo_path_info *a,
 958                                   const struct tomoyo_path_info *b)
 959 {
 960         return a->hash != b->hash || strcmp(a->name, b->name);
 961 }
 962
 963 /**
 964  * tomoyo_put_name - Drop reference on "struct tomoyo_name".
 965  *
 966  * @name: Pointer to "struct tomoyo_path_info". Maybe NULL.
 967  *
 968  * Returns nothing.
 969  */
 970 static inline void tomoyo_put_name(const struct tomoyo_path_info *name)
 971 {
 972         if (name) {
 973                 struct tomoyo_name *ptr =
 974                         container_of(name, typeof(*ptr), entry);
 975                 atomic_dec(&ptr->head.users);
 976         }
 977 }
 978
 979 /**
 980  * tomoyo_put_condition - Drop reference on "struct tomoyo_condition".
 981  *
 982  * @cond: Pointer to "struct tomoyo_condition". Maybe NULL.
 983  *
 984  * Returns nothing.
 985  */
 986 static inline void tomoyo_put_condition(struct tomoyo_condition *cond)
 987 {
 988         if (cond)
 989                 atomic_dec(&cond->head.users);
 990 }
 991
 992 /**
 993  * tomoyo_put_group - Drop reference on "struct tomoyo_group".
 994  *
 995  * @group: Pointer to "struct tomoyo_group". Maybe NULL.
 996  *
 997  * Returns nothing.
 998  */
 999 static inline void tomoyo_put_group(struct tomoyo_group *group)
1000 {
1001         if (group)
1002                 atomic_dec(&group->head.users);
1003 }
1004
1005 /**
1006  * tomoyo_domain - Get "struct tomoyo_domain_info" for current thread.
1007  *
1008  * Returns pointer to "struct tomoyo_domain_info" for current thread.
1009  */
1010 static inline struct tomoyo_domain_info *tomoyo_domain(void)
1011 {
1012         return current_cred()->security;
1013 }
1014
1015 /**
1016  * tomoyo_real_domain - Get "struct tomoyo_domain_info" for specified thread.
1017  *
1018  * @task: Pointer to "struct task_struct".
1019  *
1020  * Returns pointer to "struct tomoyo_security" for specified thread.
1021  */
1022 static inline struct tomoyo_domain_info *tomoyo_real_domain(struct task_struct
1023                                                             *task)
1024 {
1025         return task_cred_xxx(task, security);
1026 }
1027
1028 /**
1029  * tomoyo_same_name_union - Check for duplicated "struct tomoyo_name_union" entry.
1030  *
1031  * @a: Pointer to "struct tomoyo_name_union".
1032  * @b: Pointer to "struct tomoyo_name_union".
1033  *
1034  * Returns true if @a == @b, false otherwise.
1035  */
1036 static inline bool tomoyo_same_name_union
1037 (const struct tomoyo_name_union *a, const struct tomoyo_name_union *b)
1038 {
1039         return a->filename == b->filename && a->group == b->group;
1040 }
1041
1042 /**
1043  * tomoyo_same_number_union - Check for duplicated "struct tomoyo_number_union" entry.
1044  *
1045  * @a: Pointer to "struct tomoyo_number_union".
1046  * @b: Pointer to "struct tomoyo_number_union".
1047  *
1048  * Returns true if @a == @b, false otherwise.
1049  */
1050 static inline bool tomoyo_same_number_union
1051 (const struct tomoyo_number_union *a, const struct tomoyo_number_union *b)
1052 {
1053         return a->values[0] == b->values[0] && a->values[1] == b->values[1] &&
1054                 a->group == b->group && a->value_type[0] == b->value_type[0] &&
1055                 a->value_type[1] == b->value_type[1];
1056 }
1057
1058 /**
1059  * tomoyo_current_namespace - Get "struct tomoyo_policy_namespace" for current thread.
1060  *
1061  * Returns pointer to "struct tomoyo_policy_namespace" for current thread.
1062  */
1063 static inline struct tomoyo_policy_namespace *tomoyo_current_namespace(void)
1064 {
1065         return tomoyo_domain()->ns;
1066 }
1067
1068 #if defined(CONFIG_SLOB)
1069
1070 /**
1071  * tomoyo_round2 - Round up to power of 2 for calculating memory usage.
1072  *
1073  * @size: Size to be rounded up.
1074  *
1075  * Returns @size.
1076  *
1077  * Since SLOB does not round up, this function simply returns @size.
1078  */
1079 static inline int tomoyo_round2(size_t size)
1080 {
1081         return size;
1082 }
1083
1084 #else
1085
1086 /**
1087  * tomoyo_round2 - Round up to power of 2 for calculating memory usage.
1088  *
1089  * @size: Size to be rounded up.
1090  *
1091  * Returns rounded size.
1092  *
1093  * Strictly speaking, SLAB may be able to allocate (e.g.) 96 bytes instead of
1094  * (e.g.) 128 bytes.
1095  */
1096 static inline int tomoyo_round2(size_t size)
1097 {
1098 #if PAGE_SIZE == 4096
1099         size_t bsize = 32;
1100 #else
1101         size_t bsize = 64;
1102 #endif
1103         if (!size)
1104                 return 0;
1105         while (size > bsize)
1106                 bsize <<= 1;
1107         return bsize;
1108 }
1109
1110 #endif
1111
1112 /**
1113  * list_for_each_cookie - iterate over a list with cookie.
1114  * @pos:        the &struct list_head to use as a loop cursor.
1115  * @head:       the head for your list.
1116  */
1117 #define list_for_each_cookie(pos, head)                                 \
1118         if (!pos)                                                       \
1119                 pos =  srcu_dereference((head)->next, &tomoyo_ss);      \
1120         for ( ; pos != (head); pos = srcu_dereference(pos->next, &tomoyo_ss))
1121
1122 #endif /* !defined(_SECURITY_TOMOYO_COMMON_H) */