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_EXEC_ARGC,            /* "struct linux_binprm *"->argc */
  58         TOMOYO_EXEC_ENVC,            /* "struct linux_binprm *"->envc */
  59         TOMOYO_TYPE_IS_SOCKET,       /* S_IFSOCK */
  60         TOMOYO_TYPE_IS_SYMLINK,      /* S_IFLNK */
  61         TOMOYO_TYPE_IS_FILE,         /* S_IFREG */
  62         TOMOYO_TYPE_IS_BLOCK_DEV,    /* S_IFBLK */
  63         TOMOYO_TYPE_IS_DIRECTORY,    /* S_IFDIR */
  64         TOMOYO_TYPE_IS_CHAR_DEV,     /* S_IFCHR */
  65         TOMOYO_TYPE_IS_FIFO,         /* S_IFIFO */
  66         TOMOYO_MODE_SETUID,          /* S_ISUID */
  67         TOMOYO_MODE_SETGID,          /* S_ISGID */
  68         TOMOYO_MODE_STICKY,          /* S_ISVTX */
  69         TOMOYO_MODE_OWNER_READ,      /* S_IRUSR */
  70         TOMOYO_MODE_OWNER_WRITE,     /* S_IWUSR */
  71         TOMOYO_MODE_OWNER_EXECUTE,   /* S_IXUSR */
  72         TOMOYO_MODE_GROUP_READ,      /* S_IRGRP */
  73         TOMOYO_MODE_GROUP_WRITE,     /* S_IWGRP */
  74         TOMOYO_MODE_GROUP_EXECUTE,   /* S_IXGRP */
  75         TOMOYO_MODE_OTHERS_READ,     /* S_IROTH */
  76         TOMOYO_MODE_OTHERS_WRITE,    /* S_IWOTH */
  77         TOMOYO_MODE_OTHERS_EXECUTE,  /* S_IXOTH */
  78         TOMOYO_EXEC_REALPATH,
  79         TOMOYO_SYMLINK_TARGET,
  80         TOMOYO_PATH1_UID,
  81         TOMOYO_PATH1_GID,
  82         TOMOYO_PATH1_INO,
  83         TOMOYO_PATH1_MAJOR,
  84         TOMOYO_PATH1_MINOR,
  85         TOMOYO_PATH1_PERM,
  86         TOMOYO_PATH1_TYPE,
  87         TOMOYO_PATH1_DEV_MAJOR,
  88         TOMOYO_PATH1_DEV_MINOR,
  89         TOMOYO_PATH2_UID,
  90         TOMOYO_PATH2_GID,
  91         TOMOYO_PATH2_INO,
  92         TOMOYO_PATH2_MAJOR,
  93         TOMOYO_PATH2_MINOR,
  94         TOMOYO_PATH2_PERM,
  95         TOMOYO_PATH2_TYPE,
  96         TOMOYO_PATH2_DEV_MAJOR,
  97         TOMOYO_PATH2_DEV_MINOR,
  98         TOMOYO_PATH1_PARENT_UID,
  99         TOMOYO_PATH1_PARENT_GID,
 100         TOMOYO_PATH1_PARENT_INO,
 101         TOMOYO_PATH1_PARENT_PERM,
 102         TOMOYO_PATH2_PARENT_UID,
 103         TOMOYO_PATH2_PARENT_GID,
 104         TOMOYO_PATH2_PARENT_INO,
 105         TOMOYO_PATH2_PARENT_PERM,
 106         TOMOYO_MAX_CONDITION_KEYWORD,
 107         TOMOYO_NUMBER_UNION,
 108         TOMOYO_NAME_UNION,
 109         TOMOYO_ARGV_ENTRY,
 110         TOMOYO_ENVP_ENTRY,
 111 };
 112
 113
 114 /* Index numbers for stat(). */
 115 enum tomoyo_path_stat_index {
 116         /* Do not change this order. */
 117         TOMOYO_PATH1,
 118         TOMOYO_PATH1_PARENT,
 119         TOMOYO_PATH2,
 120         TOMOYO_PATH2_PARENT,
 121         TOMOYO_MAX_PATH_STAT
 122 };
 123
 124 /* Index numbers for operation mode. */
 125 enum tomoyo_mode_index {
 126         TOMOYO_CONFIG_DISABLED,
 127         TOMOYO_CONFIG_LEARNING,
 128         TOMOYO_CONFIG_PERMISSIVE,
 129         TOMOYO_CONFIG_ENFORCING,
 130         TOMOYO_CONFIG_MAX_MODE,
 131         TOMOYO_CONFIG_WANT_REJECT_LOG =  64,
 132         TOMOYO_CONFIG_WANT_GRANT_LOG  = 128,
 133         TOMOYO_CONFIG_USE_DEFAULT     = 255,
 134 };
 135
 136 /* Index numbers for entry type. */
 137 enum tomoyo_policy_id {
 138         TOMOYO_ID_GROUP,
 139         TOMOYO_ID_PATH_GROUP,
 140         TOMOYO_ID_NUMBER_GROUP,
 141         TOMOYO_ID_TRANSITION_CONTROL,
 142         TOMOYO_ID_AGGREGATOR,
 143         TOMOYO_ID_MANAGER,
 144         TOMOYO_ID_CONDITION,
 145         TOMOYO_ID_NAME,
 146         TOMOYO_ID_ACL,
 147         TOMOYO_ID_DOMAIN,
 148         TOMOYO_MAX_POLICY
 149 };
 150
 151 /* Index numbers for domain's attributes. */
 152 enum tomoyo_domain_info_flags_index {
 153         /* Quota warnning flag.   */
 154         TOMOYO_DIF_QUOTA_WARNED,
 155         /*
 156          * This domain was unable to create a new domain at
 157          * tomoyo_find_next_domain() because the name of the domain to be
 158          * created was too long or it could not allocate memory.
 159          * More than one process continued execve() without domain transition.
 160          */
 161         TOMOYO_DIF_TRANSITION_FAILED,
 162         TOMOYO_MAX_DOMAIN_INFO_FLAGS
 163 };
 164
 165 /* Index numbers for group entries. */
 166 enum tomoyo_group_id {
 167         TOMOYO_PATH_GROUP,
 168         TOMOYO_NUMBER_GROUP,
 169         TOMOYO_MAX_GROUP
 170 };
 171
 172 /* Index numbers for type of numeric values. */
 173 enum tomoyo_value_type {
 174         TOMOYO_VALUE_TYPE_INVALID,
 175         TOMOYO_VALUE_TYPE_DECIMAL,
 176         TOMOYO_VALUE_TYPE_OCTAL,
 177         TOMOYO_VALUE_TYPE_HEXADECIMAL,
 178 };
 179
 180 /* Index numbers for domain transition control keywords. */
 181 enum tomoyo_transition_type {
 182         /* Do not change this order, */
 183         TOMOYO_TRANSITION_CONTROL_NO_RESET,
 184         TOMOYO_TRANSITION_CONTROL_RESET,
 185         TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE,
 186         TOMOYO_TRANSITION_CONTROL_INITIALIZE,
 187         TOMOYO_TRANSITION_CONTROL_NO_KEEP,
 188         TOMOYO_TRANSITION_CONTROL_KEEP,
 189         TOMOYO_MAX_TRANSITION_TYPE
 190 };
 191
 192 /* Index numbers for Access Controls. */
 193 enum tomoyo_acl_entry_type_index {
 194         TOMOYO_TYPE_PATH_ACL,
 195         TOMOYO_TYPE_PATH2_ACL,
 196         TOMOYO_TYPE_PATH_NUMBER_ACL,
 197         TOMOYO_TYPE_MKDEV_ACL,
 198         TOMOYO_TYPE_MOUNT_ACL,
 199 };
 200
 201 /* Index numbers for access controls with one pathname. */
 202 enum tomoyo_path_acl_index {
 203         TOMOYO_TYPE_EXECUTE,
 204         TOMOYO_TYPE_READ,
 205         TOMOYO_TYPE_WRITE,
 206         TOMOYO_TYPE_APPEND,
 207         TOMOYO_TYPE_UNLINK,
 208         TOMOYO_TYPE_GETATTR,
 209         TOMOYO_TYPE_RMDIR,
 210         TOMOYO_TYPE_TRUNCATE,
 211         TOMOYO_TYPE_SYMLINK,
 212         TOMOYO_TYPE_CHROOT,
 213         TOMOYO_TYPE_UMOUNT,
 214         TOMOYO_MAX_PATH_OPERATION
 215 };
 216
 217 /* Index numbers for /sys/kernel/security/tomoyo/stat interface. */
 218 enum tomoyo_memory_stat_type {
 219         TOMOYO_MEMORY_POLICY,
 220         TOMOYO_MEMORY_AUDIT,
 221         TOMOYO_MEMORY_QUERY,
 222         TOMOYO_MAX_MEMORY_STAT
 223 };
 224
 225 enum tomoyo_mkdev_acl_index {
 226         TOMOYO_TYPE_MKBLOCK,
 227         TOMOYO_TYPE_MKCHAR,
 228         TOMOYO_MAX_MKDEV_OPERATION
 229 };
 230
 231 /* Index numbers for access controls with two pathnames. */
 232 enum tomoyo_path2_acl_index {
 233         TOMOYO_TYPE_LINK,
 234         TOMOYO_TYPE_RENAME,
 235         TOMOYO_TYPE_PIVOT_ROOT,
 236         TOMOYO_MAX_PATH2_OPERATION
 237 };
 238
 239 /* Index numbers for access controls with one pathname and one number. */
 240 enum tomoyo_path_number_acl_index {
 241         TOMOYO_TYPE_CREATE,
 242         TOMOYO_TYPE_MKDIR,
 243         TOMOYO_TYPE_MKFIFO,
 244         TOMOYO_TYPE_MKSOCK,
 245         TOMOYO_TYPE_IOCTL,
 246         TOMOYO_TYPE_CHMOD,
 247         TOMOYO_TYPE_CHOWN,
 248         TOMOYO_TYPE_CHGRP,
 249         TOMOYO_MAX_PATH_NUMBER_OPERATION
 250 };
 251
 252 /* Index numbers for /sys/kernel/security/tomoyo/ interfaces. */
 253 enum tomoyo_securityfs_interface_index {
 254         TOMOYO_DOMAINPOLICY,
 255         TOMOYO_EXCEPTIONPOLICY,
 256         TOMOYO_PROCESS_STATUS,
 257         TOMOYO_STAT,
 258         TOMOYO_SELFDOMAIN,
 259         TOMOYO_AUDIT,
 260         TOMOYO_VERSION,
 261         TOMOYO_PROFILE,
 262         TOMOYO_QUERY,
 263         TOMOYO_MANAGER
 264 };
 265
 266 /* Index numbers for special mount operations. */
 267 enum tomoyo_special_mount {
 268         TOMOYO_MOUNT_BIND,            /* mount --bind /source /dest   */
 269         TOMOYO_MOUNT_MOVE,            /* mount --move /old /new       */
 270         TOMOYO_MOUNT_REMOUNT,         /* mount -o remount /dir        */
 271         TOMOYO_MOUNT_MAKE_UNBINDABLE, /* mount --make-unbindable /dir */
 272         TOMOYO_MOUNT_MAKE_PRIVATE,    /* mount --make-private /dir    */
 273         TOMOYO_MOUNT_MAKE_SLAVE,      /* mount --make-slave /dir      */
 274         TOMOYO_MOUNT_MAKE_SHARED,     /* mount --make-shared /dir     */
 275         TOMOYO_MAX_SPECIAL_MOUNT
 276 };
 277
 278 /* Index numbers for functionality. */
 279 enum tomoyo_mac_index {
 280         TOMOYO_MAC_FILE_EXECUTE,
 281         TOMOYO_MAC_FILE_OPEN,
 282         TOMOYO_MAC_FILE_CREATE,
 283         TOMOYO_MAC_FILE_UNLINK,
 284         TOMOYO_MAC_FILE_GETATTR,
 285         TOMOYO_MAC_FILE_MKDIR,
 286         TOMOYO_MAC_FILE_RMDIR,
 287         TOMOYO_MAC_FILE_MKFIFO,
 288         TOMOYO_MAC_FILE_MKSOCK,
 289         TOMOYO_MAC_FILE_TRUNCATE,
 290         TOMOYO_MAC_FILE_SYMLINK,
 291         TOMOYO_MAC_FILE_MKBLOCK,
 292         TOMOYO_MAC_FILE_MKCHAR,
 293         TOMOYO_MAC_FILE_LINK,
 294         TOMOYO_MAC_FILE_RENAME,
 295         TOMOYO_MAC_FILE_CHMOD,
 296         TOMOYO_MAC_FILE_CHOWN,
 297         TOMOYO_MAC_FILE_CHGRP,
 298         TOMOYO_MAC_FILE_IOCTL,
 299         TOMOYO_MAC_FILE_CHROOT,
 300         TOMOYO_MAC_FILE_MOUNT,
 301         TOMOYO_MAC_FILE_UMOUNT,
 302         TOMOYO_MAC_FILE_PIVOT_ROOT,
 303         TOMOYO_MAX_MAC_INDEX
 304 };
 305
 306 /* Index numbers for category of functionality. */
 307 enum tomoyo_mac_category_index {
 308         TOMOYO_MAC_CATEGORY_FILE,
 309         TOMOYO_MAX_MAC_CATEGORY_INDEX
 310 };
 311
 312 /*
 313  * Retry this request. Returned by tomoyo_supervisor() if policy violation has
 314  * occurred in enforcing mode and the userspace daemon decided to retry.
 315  *
 316  * We must choose a positive value in order to distinguish "granted" (which is
 317  * 0) and "rejected" (which is a negative value) and "retry".
 318  */
 319 #define TOMOYO_RETRY_REQUEST 1
 320
 321 /* Index numbers for /sys/kernel/security/tomoyo/stat interface. */
 322 enum tomoyo_policy_stat_type {
 323         /* Do not change this order. */
 324         TOMOYO_STAT_POLICY_UPDATES,
 325         TOMOYO_STAT_POLICY_LEARNING,   /* == TOMOYO_CONFIG_LEARNING */
 326         TOMOYO_STAT_POLICY_PERMISSIVE, /* == TOMOYO_CONFIG_PERMISSIVE */
 327         TOMOYO_STAT_POLICY_ENFORCING,  /* == TOMOYO_CONFIG_ENFORCING */
 328         TOMOYO_MAX_POLICY_STAT
 329 };
 330
 331 /* Index numbers for profile's PREFERENCE values. */
 332 enum tomoyo_pref_index {
 333         TOMOYO_PREF_MAX_AUDIT_LOG,
 334         TOMOYO_PREF_MAX_LEARNING_ENTRY,
 335         TOMOYO_MAX_PREF
 336 };
 337
 338 /********** Structure definitions. **********/
 339
 340 /* Common header for holding ACL entries. */
 341 struct tomoyo_acl_head {
 342         struct list_head list;
 343         bool is_deleted;
 344 } __packed;
 345
 346 /* Common header for shared entries. */
 347 struct tomoyo_shared_acl_head {
 348         struct list_head list;
 349         atomic_t users;
 350 } __packed;
 351
 352 struct tomoyo_policy_namespace;
 353
 354 /* Structure for request info. */
 355 struct tomoyo_request_info {
 356         /*
 357          * For holding parameters specific to operations which deal files.
 358          * NULL if not dealing files.
 359          */
 360         struct tomoyo_obj_info *obj;
 361         /*
 362          * For holding parameters specific to execve() request.
 363          * NULL if not dealing do_execve().
 364          */
 365         struct tomoyo_execve *ee;
 366         struct tomoyo_domain_info *domain;
 367         /* For holding parameters. */
 368         union {
 369                 struct {
 370                         const struct tomoyo_path_info *filename;
 371                         /* For using wildcards at tomoyo_find_next_domain(). */
 372                         const struct tomoyo_path_info *matched_path;
 373                         /* One of values in "enum tomoyo_path_acl_index". */
 374                         u8 operation;
 375                 } path;
 376                 struct {
 377                         const struct tomoyo_path_info *filename1;
 378                         const struct tomoyo_path_info *filename2;
 379                         /* One of values in "enum tomoyo_path2_acl_index". */
 380                         u8 operation;
 381                 } path2;
 382                 struct {
 383                         const struct tomoyo_path_info *filename;
 384                         unsigned int mode;
 385                         unsigned int major;
 386                         unsigned int minor;
 387                         /* One of values in "enum tomoyo_mkdev_acl_index". */
 388                         u8 operation;
 389                 } mkdev;
 390                 struct {
 391                         const struct tomoyo_path_info *filename;
 392                         unsigned long number;
 393                         /*
 394                          * One of values in
 395                          * "enum tomoyo_path_number_acl_index".
 396                          */
 397                         u8 operation;
 398                 } path_number;
 399                 struct {
 400                         const struct tomoyo_path_info *type;
 401                         const struct tomoyo_path_info *dir;
 402                         const struct tomoyo_path_info *dev;
 403                         unsigned long flags;
 404                         int need_dev;
 405                 } mount;
 406         } param;
 407         u8 param_type;
 408         bool granted;
 409         u8 retry;
 410         u8 profile;
 411         u8 mode; /* One of tomoyo_mode_index . */
 412         u8 type;
 413 };
 414
 415 /* Structure for holding a token. */
 416 struct tomoyo_path_info {
 417         const char *name;
 418         u32 hash;          /* = full_name_hash(name, strlen(name)) */
 419         u16 const_len;     /* = tomoyo_const_part_length(name)     */
 420         bool is_dir;       /* = tomoyo_strendswith(name, "/")      */
 421         bool is_patterned; /* = tomoyo_path_contains_pattern(name) */
 422 };
 423
 424 /* Structure for holding string data. */
 425 struct tomoyo_name {
 426         struct tomoyo_shared_acl_head head;
 427         struct tomoyo_path_info entry;
 428 };
 429
 430 /* Structure for holding a word. */
 431 struct tomoyo_name_union {
 432         /* Either @filename or @group is NULL. */
 433         const struct tomoyo_path_info *filename;
 434         struct tomoyo_group *group;
 435 };
 436
 437 /* Structure for holding a number. */
 438 struct tomoyo_number_union {
 439         unsigned long values[2];
 440         struct tomoyo_group *group; /* Maybe NULL. */
 441         /* One of values in "enum tomoyo_value_type". */
 442         u8 value_type[2];
 443 };
 444
 445 /* Structure for "path_group"/"number_group" directive. */
 446 struct tomoyo_group {
 447         struct tomoyo_shared_acl_head head;
 448         const struct tomoyo_path_info *group_name;
 449         struct list_head member_list;
 450 };
 451
 452 /* Structure for "path_group" directive. */
 453 struct tomoyo_path_group {
 454         struct tomoyo_acl_head head;
 455         const struct tomoyo_path_info *member_name;
 456 };
 457
 458 /* Structure for "number_group" directive. */
 459 struct tomoyo_number_group {
 460         struct tomoyo_acl_head head;
 461         struct tomoyo_number_union number;
 462 };
 463
 464 /* Subset of "struct stat". Used by conditional ACL and audit logs. */
 465 struct tomoyo_mini_stat {
 466         uid_t uid;
 467         gid_t gid;
 468         ino_t ino;
 469         mode_t mode;
 470         dev_t dev;
 471         dev_t rdev;
 472 };
 473
 474 /* Structure for dumping argv[] and envp[] of "struct linux_binprm". */
 475 struct tomoyo_page_dump {
 476         struct page *page;    /* Previously dumped page. */
 477         char *data;           /* Contents of "page". Size is PAGE_SIZE. */
 478 };
 479
 480 /* Structure for attribute checks in addition to pathname checks. */
 481 struct tomoyo_obj_info {
 482         /*
 483          * True if tomoyo_get_attributes() was already called, false otherwise.
 484          */
 485         bool validate_done;
 486         /* True if @stat[] is valid. */
 487         bool stat_valid[TOMOYO_MAX_PATH_STAT];
 488         /* First pathname. Initialized with { NULL, NULL } if no path. */
 489         struct path path1;
 490         /* Second pathname. Initialized with { NULL, NULL } if no path. */
 491         struct path path2;
 492         /*
 493          * Information on @path1, @path1's parent directory, @path2, @path2's
 494          * parent directory.
 495          */
 496         struct tomoyo_mini_stat stat[TOMOYO_MAX_PATH_STAT];
 497         /*
 498          * Content of symbolic link to be created. NULL for operations other
 499          * than symlink().
 500          */
 501         struct tomoyo_path_info *symlink_target;
 502 };
 503
 504 /* Structure for argv[]. */
 505 struct tomoyo_argv {
 506         unsigned long index;
 507         const struct tomoyo_path_info *value;
 508         bool is_not;
 509 };
 510
 511 /* Structure for envp[]. */
 512 struct tomoyo_envp {
 513         const struct tomoyo_path_info *name;
 514         const struct tomoyo_path_info *value;
 515         bool is_not;
 516 };
 517
 518 /* Structure for execve() operation. */
 519 struct tomoyo_execve {
 520         struct tomoyo_request_info r;
 521         struct tomoyo_obj_info obj;
 522         struct linux_binprm *bprm;
 523         /* For dumping argv[] and envp[]. */
 524         struct tomoyo_page_dump dump;
 525         /* For temporary use. */
 526         char *tmp; /* Size is TOMOYO_EXEC_TMPSIZE bytes */
 527 };
 528
 529 /* Structure for entries which follows "struct tomoyo_condition". */
 530 struct tomoyo_condition_element {
 531         /*
 532          * Left hand operand. A "struct tomoyo_argv" for TOMOYO_ARGV_ENTRY, a
 533          * "struct tomoyo_envp" for TOMOYO_ENVP_ENTRY is attached to the tail
 534          * of the array of this struct.
 535          */
 536         u8 left;
 537         /*
 538          * Right hand operand. A "struct tomoyo_number_union" for
 539          * TOMOYO_NUMBER_UNION, a "struct tomoyo_name_union" for
 540          * TOMOYO_NAME_UNION is attached to the tail of the array of this
 541          * struct.
 542          */
 543         u8 right;
 544         /* Equation operator. True if equals or overlaps, false otherwise. */
 545         bool equals;
 546 };
 547
 548 /* Structure for optional arguments. */
 549 struct tomoyo_condition {
 550         struct tomoyo_shared_acl_head head;
 551         u32 size; /* Memory size allocated for this entry. */
 552         u16 condc; /* Number of conditions in this struct. */
 553         u16 numbers_count; /* Number of "struct tomoyo_number_union values". */
 554         u16 names_count; /* Number of "struct tomoyo_name_union names". */
 555         u16 argc; /* Number of "struct tomoyo_argv". */
 556         u16 envc; /* Number of "struct tomoyo_envp". */
 557         /*
 558          * struct tomoyo_condition_element condition[condc];
 559          * struct tomoyo_number_union values[numbers_count];
 560          * struct tomoyo_name_union names[names_count];
 561          * struct tomoyo_argv argv[argc];
 562          * struct tomoyo_envp envp[envc];
 563          */
 564 };
 565
 566 /* Common header for individual entries. */
 567 struct tomoyo_acl_info {
 568         struct list_head list;
 569         struct tomoyo_condition *cond; /* Maybe NULL. */
 570         bool is_deleted;
 571         u8 type; /* One of values in "enum tomoyo_acl_entry_type_index". */
 572 } __packed;
 573
 574 /* Structure for domain information. */
 575 struct tomoyo_domain_info {
 576         struct list_head list;
 577         struct list_head acl_info_list;
 578         /* Name of this domain. Never NULL.          */
 579         const struct tomoyo_path_info *domainname;
 580         /* Namespace for this domain. Never NULL. */
 581         struct tomoyo_policy_namespace *ns;
 582         u8 profile;        /* Profile number to use. */
 583         u8 group;          /* Group number to use.   */
 584         bool is_deleted;   /* Delete flag.           */
 585         bool flags[TOMOYO_MAX_DOMAIN_INFO_FLAGS];
 586         atomic_t users; /* Number of referring credentials. */
 587 };
 588
 589 /*
 590  * Structure for "file execute", "file read", "file write", "file append",
 591  * "file unlink", "file getattr", "file rmdir", "file truncate",
 592  * "file symlink", "file chroot" and "file unmount" directive.
 593  */
 594 struct tomoyo_path_acl {
 595         struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_PATH_ACL */
 596         u16 perm; /* Bitmask of values in "enum tomoyo_path_acl_index". */
 597         struct tomoyo_name_union name;
 598 };
 599
 600 /*
 601  * Structure for "file create", "file mkdir", "file mkfifo", "file mksock",
 602  * "file ioctl", "file chmod", "file chown" and "file chgrp" directive.
 603  */
 604 struct tomoyo_path_number_acl {
 605         struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_PATH_NUMBER_ACL */
 606         /* Bitmask of values in "enum tomoyo_path_number_acl_index". */
 607         u8 perm;
 608         struct tomoyo_name_union name;
 609         struct tomoyo_number_union number;
 610 };
 611
 612 /* Structure for "file mkblock" and "file mkchar" directive. */
 613 struct tomoyo_mkdev_acl {
 614         struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_MKDEV_ACL */
 615         u8 perm; /* Bitmask of values in "enum tomoyo_mkdev_acl_index". */
 616         struct tomoyo_name_union name;
 617         struct tomoyo_number_union mode;
 618         struct tomoyo_number_union major;
 619         struct tomoyo_number_union minor;
 620 };
 621
 622 /*
 623  * Structure for "file rename", "file link" and "file pivot_root" directive.
 624  */
 625 struct tomoyo_path2_acl {
 626         struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_PATH2_ACL */
 627         u8 perm; /* Bitmask of values in "enum tomoyo_path2_acl_index". */
 628         struct tomoyo_name_union name1;
 629         struct tomoyo_name_union name2;
 630 };
 631
 632 /* Structure for "file mount" directive. */
 633 struct tomoyo_mount_acl {
 634         struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_MOUNT_ACL */
 635         struct tomoyo_name_union dev_name;
 636         struct tomoyo_name_union dir_name;
 637         struct tomoyo_name_union fs_type;
 638         struct tomoyo_number_union flags;
 639 };
 640
 641 /* Structure for holding a line from /sys/kernel/security/tomoyo/ interface. */
 642 struct tomoyo_acl_param {
 643         char *data;
 644         struct list_head *list;
 645         struct tomoyo_policy_namespace *ns;
 646         bool is_delete;
 647 };
 648
 649 #define TOMOYO_MAX_IO_READ_QUEUE 64
 650
 651 /*
 652  * Structure for reading/writing policy via /sys/kernel/security/tomoyo
 653  * interfaces.
 654  */
 655 struct tomoyo_io_buffer {
 656         void (*read) (struct tomoyo_io_buffer *);
 657         int (*write) (struct tomoyo_io_buffer *);
 658         int (*poll) (struct file *file, poll_table *wait);
 659         /* Exclusive lock for this structure.   */
 660         struct mutex io_sem;
 661         char __user *read_user_buf;
 662         size_t read_user_buf_avail;
 663         struct {
 664                 struct list_head *ns;
 665                 struct list_head *domain;
 666                 struct list_head *group;
 667                 struct list_head *acl;
 668                 size_t avail;
 669                 unsigned int step;
 670                 unsigned int query_index;
 671                 u16 index;
 672                 u16 cond_index;
 673                 u8 acl_group_index;
 674                 u8 cond_step;
 675                 u8 bit;
 676                 u8 w_pos;
 677                 bool eof;
 678                 bool print_this_domain_only;
 679                 bool print_transition_related_only;
 680                 bool print_cond_part;
 681                 const char *w[TOMOYO_MAX_IO_READ_QUEUE];
 682         } r;
 683         struct {
 684                 struct tomoyo_policy_namespace *ns;
 685                 /* The position currently writing to.   */
 686                 struct tomoyo_domain_info *domain;
 687                 /* Bytes available for writing.         */
 688                 size_t avail;
 689                 bool is_delete;
 690         } w;
 691         /* Buffer for reading.                  */
 692         char *read_buf;
 693         /* Size of read buffer.                 */
 694         size_t readbuf_size;
 695         /* Buffer for writing.                  */
 696         char *write_buf;
 697         /* Size of write buffer.                */
 698         size_t writebuf_size;
 699         /* Type of this interface.              */
 700         enum tomoyo_securityfs_interface_index type;
 701         /* Users counter protected by tomoyo_io_buffer_list_lock. */
 702         u8 users;
 703         /* List for telling GC not to kfree() elements. */
 704         struct list_head list;
 705 };
 706
 707 /*
 708  * Structure for "initialize_domain"/"no_initialize_domain"/"keep_domain"/
 709  * "no_keep_domain" keyword.
 710  */
 711 struct tomoyo_transition_control {
 712         struct tomoyo_acl_head head;
 713         u8 type; /* One of values in "enum tomoyo_transition_type".  */
 714         /* True if the domainname is tomoyo_get_last_name(). */
 715         bool is_last_name;
 716         const struct tomoyo_path_info *domainname; /* Maybe NULL */
 717         const struct tomoyo_path_info *program;    /* Maybe NULL */
 718 };
 719
 720 /* Structure for "aggregator" keyword. */
 721 struct tomoyo_aggregator {
 722         struct tomoyo_acl_head head;
 723         const struct tomoyo_path_info *original_name;
 724         const struct tomoyo_path_info *aggregated_name;
 725 };
 726
 727 /* Structure for policy manager. */
 728 struct tomoyo_manager {
 729         struct tomoyo_acl_head head;
 730         bool is_domain;  /* True if manager is a domainname. */
 731         /* A path to program or a domainname. */
 732         const struct tomoyo_path_info *manager;
 733 };
 734
 735 struct tomoyo_preference {
 736         unsigned int learning_max_entry;
 737         bool enforcing_verbose;
 738         bool learning_verbose;
 739         bool permissive_verbose;
 740 };
 741
 742 /* Structure for /sys/kernel/security/tomnoyo/profile interface. */
 743 struct tomoyo_profile {
 744         const struct tomoyo_path_info *comment;
 745         struct tomoyo_preference *learning;
 746         struct tomoyo_preference *permissive;
 747         struct tomoyo_preference *enforcing;
 748         struct tomoyo_preference preference;
 749         u8 default_config;
 750         u8 config[TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX];
 751         unsigned int pref[TOMOYO_MAX_PREF];
 752 };
 753
 754 /* Structure for representing YYYY/MM/DD hh/mm/ss. */
 755 struct tomoyo_time {
 756         u16 year;
 757         u8 month;
 758         u8 day;
 759         u8 hour;
 760         u8 min;
 761         u8 sec;
 762 };
 763
 764 /* Structure for policy namespace. */
 765 struct tomoyo_policy_namespace {
 766         /* Profile table. Memory is allocated as needed. */
 767         struct tomoyo_profile *profile_ptr[TOMOYO_MAX_PROFILES];
 768         /* List of "struct tomoyo_group". */
 769         struct list_head group_list[TOMOYO_MAX_GROUP];
 770         /* List of policy. */
 771         struct list_head policy_list[TOMOYO_MAX_POLICY];
 772         /* The global ACL referred by "use_group" keyword. */
 773         struct list_head acl_group[TOMOYO_MAX_ACL_GROUPS];
 774         /* List for connecting to tomoyo_namespace_list list. */
 775         struct list_head namespace_list;
 776         /* Profile version. Currently only 20100903 is defined. */
 777         unsigned int profile_version;
 778         /* Name of this namespace (e.g. "<kernel>", "</usr/sbin/httpd>" ). */
 779         const char *name;
 780 };
 781
 782 /********** Function prototypes. **********/
 783
 784 bool tomoyo_compare_number_union(const unsigned long value,
 785                                  const struct tomoyo_number_union *ptr);
 786 bool tomoyo_condition(struct tomoyo_request_info *r,
 787                       const struct tomoyo_condition *cond);
 788 bool tomoyo_correct_domain(const unsigned char *domainname);
 789 bool tomoyo_correct_path(const char *filename);
 790 bool tomoyo_correct_word(const char *string);
 791 bool tomoyo_domain_def(const unsigned char *buffer);
 792 bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r);
 793 bool tomoyo_dump_page(struct linux_binprm *bprm, unsigned long pos,
 794                       struct tomoyo_page_dump *dump);
 795 bool tomoyo_memory_ok(void *ptr);
 796 bool tomoyo_number_matches_group(const unsigned long min,
 797                                  const unsigned long max,
 798                                  const struct tomoyo_group *group);
 799 bool tomoyo_parse_name_union(struct tomoyo_acl_param *param,
 800                              struct tomoyo_name_union *ptr);
 801 bool tomoyo_parse_number_union(struct tomoyo_acl_param *param,
 802                                struct tomoyo_number_union *ptr);
 803 bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename,
 804                                  const struct tomoyo_path_info *pattern);
 805 bool tomoyo_permstr(const char *string, const char *keyword);
 806 bool tomoyo_str_starts(char **src, const char *find);
 807 char *tomoyo_encode(const char *str);
 808 char *tomoyo_init_log(struct tomoyo_request_info *r, int len, const char *fmt,
 809                       va_list args);
 810 char *tomoyo_read_token(struct tomoyo_acl_param *param);
 811 char *tomoyo_realpath_from_path(struct path *path);
 812 char *tomoyo_realpath_nofollow(const char *pathname);
 813 const char *tomoyo_get_exe(void);
 814 const char *tomoyo_yesno(const unsigned int value);
 815 const struct tomoyo_path_info *tomoyo_compare_name_union
 816 (const struct tomoyo_path_info *name, const struct tomoyo_name_union *ptr);
 817 const struct tomoyo_path_info *tomoyo_get_name(const char *name);
 818 const struct tomoyo_path_info *tomoyo_path_matches_group
 819 (const struct tomoyo_path_info *pathname, const struct tomoyo_group *group);
 820 int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
 821                                  struct path *path, const int flag);
 822 int tomoyo_close_control(struct tomoyo_io_buffer *head);
 823 int tomoyo_find_next_domain(struct linux_binprm *bprm);
 824 int tomoyo_get_mode(const struct tomoyo_policy_namespace *ns, const u8 profile,
 825                     const u8 index);
 826 int tomoyo_init_request_info(struct tomoyo_request_info *r,
 827                              struct tomoyo_domain_info *domain,
 828                              const u8 index);
 829 int tomoyo_mkdev_perm(const u8 operation, struct path *path,
 830                       const unsigned int mode, unsigned int dev);
 831 int tomoyo_mount_permission(char *dev_name, struct path *path,
 832                             const char *type, unsigned long flags,
 833                             void *data_page);
 834 int tomoyo_open_control(const u8 type, struct file *file);
 835 int tomoyo_path2_perm(const u8 operation, struct path *path1,
 836                       struct path *path2);
 837 int tomoyo_path_number_perm(const u8 operation, struct path *path,
 838                             unsigned long number);
 839 int tomoyo_path_perm(const u8 operation, struct path *path,
 840                      const char *target);
 841 int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation,
 842                            const struct tomoyo_path_info *filename);
 843 int tomoyo_poll_control(struct file *file, poll_table *wait);
 844 int tomoyo_poll_log(struct file *file, poll_table *wait);
 845 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
 846         __printf(2, 3);
 847 int tomoyo_update_domain(struct tomoyo_acl_info *new_entry, const int size,
 848                          struct tomoyo_acl_param *param,
 849                          bool (*check_duplicate)
 850                          (const struct tomoyo_acl_info *,
 851                           const struct tomoyo_acl_info *),
 852                          bool (*merge_duplicate)
 853                          (struct tomoyo_acl_info *, struct tomoyo_acl_info *,
 854                           const bool));
 855 int tomoyo_update_policy(struct tomoyo_acl_head *new_entry, const int size,
 856                          struct tomoyo_acl_param *param,
 857                          bool (*check_duplicate)
 858                          (const struct tomoyo_acl_head *,
 859                           const struct tomoyo_acl_head *));
 860 int tomoyo_write_aggregator(struct tomoyo_acl_param *param);
 861 int tomoyo_write_file(struct tomoyo_acl_param *param);
 862 int tomoyo_write_group(struct tomoyo_acl_param *param, const u8 type);
 863 int tomoyo_write_transition_control(struct tomoyo_acl_param *param,
 864                                     const u8 type);
 865 ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
 866                             const int buffer_len);
 867 ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
 868                              const char __user *buffer, const int buffer_len);
 869 struct tomoyo_condition *tomoyo_get_condition(struct tomoyo_acl_param *param);
 870 struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname,
 871                                                 const bool transit);
 872 struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname);
 873 struct tomoyo_group *tomoyo_get_group(struct tomoyo_acl_param *param,
 874                                       const u8 idx);
 875 struct tomoyo_policy_namespace *tomoyo_assign_namespace
 876 (const char *domainname);
 877 struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns,
 878                                       const u8 profile);
 879 unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain,
 880                                 const u8 index);
 881 u8 tomoyo_parse_ulong(unsigned long *result, char **str);
 882 void *tomoyo_commit_ok(void *data, const unsigned int size);
 883 void __init tomoyo_load_builtin_policy(void);
 884 void __init tomoyo_mm_init(void);
 885 void tomoyo_check_acl(struct tomoyo_request_info *r,
 886                       bool (*check_entry) (struct tomoyo_request_info *,
 887                                            const struct tomoyo_acl_info *));
 888 void tomoyo_check_profile(void);
 889 void tomoyo_convert_time(time_t time, struct tomoyo_time *stamp);
 890 void tomoyo_del_condition(struct list_head *element);
 891 void tomoyo_fill_path_info(struct tomoyo_path_info *ptr);
 892 void tomoyo_get_attributes(struct tomoyo_obj_info *obj);
 893 void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns);
 894 void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
 895          __printf(2, 3);
 896 void tomoyo_load_policy(const char *filename);
 897 void tomoyo_memory_free(void *ptr);
 898 void tomoyo_normalize_line(unsigned char *buffer);
 899 void tomoyo_notify_gc(struct tomoyo_io_buffer *head, const bool is_register);
 900 void tomoyo_print_ulong(char *buffer, const int buffer_len,
 901                         const unsigned long value, const u8 type);
 902 void tomoyo_put_name_union(struct tomoyo_name_union *ptr);
 903 void tomoyo_put_number_union(struct tomoyo_number_union *ptr);
 904 void tomoyo_read_log(struct tomoyo_io_buffer *head);
 905 void tomoyo_update_stat(const u8 index);
 906 void tomoyo_warn_oom(const char *function);
 907 void tomoyo_write_log(struct tomoyo_request_info *r, const char *fmt, ...)
 908         __printf(2, 3);
 909 void tomoyo_write_log2(struct tomoyo_request_info *r, int len, const char *fmt,
 910                        va_list args);
 911
 912 /********** External variable definitions. **********/
 913
 914 extern bool tomoyo_policy_loaded;
 915 extern const char * const tomoyo_condition_keyword
 916 [TOMOYO_MAX_CONDITION_KEYWORD];
 917 extern const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS];
 918 extern const char * const tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
 919                                               + TOMOYO_MAX_MAC_CATEGORY_INDEX];
 920 extern const char * const tomoyo_mode[TOMOYO_CONFIG_MAX_MODE];
 921 extern const char * const tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION];
 922 extern const u8 tomoyo_index2category[TOMOYO_MAX_MAC_INDEX];
 923 extern const u8 tomoyo_pn2mac[TOMOYO_MAX_PATH_NUMBER_OPERATION];
 924 extern const u8 tomoyo_pnnn2mac[TOMOYO_MAX_MKDEV_OPERATION];
 925 extern const u8 tomoyo_pp2mac[TOMOYO_MAX_PATH2_OPERATION];
 926 extern struct list_head tomoyo_condition_list;
 927 extern struct list_head tomoyo_domain_list;
 928 extern struct list_head tomoyo_name_list[TOMOYO_MAX_HASH];
 929 extern struct list_head tomoyo_namespace_list;
 930 extern struct mutex tomoyo_policy_lock;
 931 extern struct srcu_struct tomoyo_ss;
 932 extern struct tomoyo_domain_info tomoyo_kernel_domain;
 933 extern struct tomoyo_policy_namespace tomoyo_kernel_namespace;
 934 extern unsigned int tomoyo_memory_quota[TOMOYO_MAX_MEMORY_STAT];
 935 extern unsigned int tomoyo_memory_used[TOMOYO_MAX_MEMORY_STAT];
 936
 937 /********** Inlined functions. **********/
 938
 939 /**
 940  * tomoyo_read_lock - Take lock for protecting policy.
 941  *
 942  * Returns index number for tomoyo_read_unlock().
 943  */
 944 static inline int tomoyo_read_lock(void)
 945 {
 946         return srcu_read_lock(&tomoyo_ss);
 947 }
 948
 949 /**
 950  * tomoyo_read_unlock - Release lock for protecting policy.
 951  *
 952  * @idx: Index number returned by tomoyo_read_lock().
 953  *
 954  * Returns nothing.
 955  */
 956 static inline void tomoyo_read_unlock(int idx)
 957 {
 958         srcu_read_unlock(&tomoyo_ss, idx);
 959 }
 960
 961 /**
 962  * tomoyo_sys_getppid - Copy of getppid().
 963  *
 964  * Returns parent process's PID.
 965  *
 966  * Alpha does not have getppid() defined. To be able to build this module on
 967  * Alpha, I have to copy getppid() from kernel/timer.c.
 968  */
 969 static inline pid_t tomoyo_sys_getppid(void)
 970 {
 971         pid_t pid;
 972         rcu_read_lock();
 973         pid = task_tgid_vnr(current->real_parent);
 974         rcu_read_unlock();
 975         return pid;
 976 }
 977
 978 /**
 979  * tomoyo_sys_getpid - Copy of getpid().
 980  *
 981  * Returns current thread's PID.
 982  *
 983  * Alpha does not have getpid() defined. To be able to build this module on
 984  * Alpha, I have to copy getpid() from kernel/timer.c.
 985  */
 986 static inline pid_t tomoyo_sys_getpid(void)
 987 {
 988         return task_tgid_vnr(current);
 989 }
 990
 991 /**
 992  * tomoyo_pathcmp - strcmp() for "struct tomoyo_path_info" structure.
 993  *
 994  * @a: Pointer to "struct tomoyo_path_info".
 995  * @b: Pointer to "struct tomoyo_path_info".
 996  *
 997  * Returns true if @a == @b, false otherwise.
 998  */
 999 static inline bool tomoyo_pathcmp(const struct tomoyo_path_info *a,
1000                                   const struct tomoyo_path_info *b)
1001 {
1002         return a->hash != b->hash || strcmp(a->name, b->name);
1003 }
1004
1005 /**
1006  * tomoyo_put_name - Drop reference on "struct tomoyo_name".
1007  *
1008  * @name: Pointer to "struct tomoyo_path_info". Maybe NULL.
1009  *
1010  * Returns nothing.
1011  */
1012 static inline void tomoyo_put_name(const struct tomoyo_path_info *name)
1013 {
1014         if (name) {
1015                 struct tomoyo_name *ptr =
1016                         container_of(name, typeof(*ptr), entry);
1017                 atomic_dec(&ptr->head.users);
1018         }
1019 }
1020
1021 /**
1022  * tomoyo_put_condition - Drop reference on "struct tomoyo_condition".
1023  *
1024  * @cond: Pointer to "struct tomoyo_condition". Maybe NULL.
1025  *
1026  * Returns nothing.
1027  */
1028 static inline void tomoyo_put_condition(struct tomoyo_condition *cond)
1029 {
1030         if (cond)
1031                 atomic_dec(&cond->head.users);
1032 }
1033
1034 /**
1035  * tomoyo_put_group - Drop reference on "struct tomoyo_group".
1036  *
1037  * @group: Pointer to "struct tomoyo_group". Maybe NULL.
1038  *
1039  * Returns nothing.
1040  */
1041 static inline void tomoyo_put_group(struct tomoyo_group *group)
1042 {
1043         if (group)
1044                 atomic_dec(&group->head.users);
1045 }
1046
1047 /**
1048  * tomoyo_domain - Get "struct tomoyo_domain_info" for current thread.
1049  *
1050  * Returns pointer to "struct tomoyo_domain_info" for current thread.
1051  */
1052 static inline struct tomoyo_domain_info *tomoyo_domain(void)
1053 {
1054         return current_cred()->security;
1055 }
1056
1057 /**
1058  * tomoyo_real_domain - Get "struct tomoyo_domain_info" for specified thread.
1059  *
1060  * @task: Pointer to "struct task_struct".
1061  *
1062  * Returns pointer to "struct tomoyo_security" for specified thread.
1063  */
1064 static inline struct tomoyo_domain_info *tomoyo_real_domain(struct task_struct
1065                                                             *task)
1066 {
1067         return task_cred_xxx(task, security);
1068 }
1069
1070 /**
1071  * tomoyo_same_name_union - Check for duplicated "struct tomoyo_name_union" entry.
1072  *
1073  * @a: Pointer to "struct tomoyo_name_union".
1074  * @b: Pointer to "struct tomoyo_name_union".
1075  *
1076  * Returns true if @a == @b, false otherwise.
1077  */
1078 static inline bool tomoyo_same_name_union
1079 (const struct tomoyo_name_union *a, const struct tomoyo_name_union *b)
1080 {
1081         return a->filename == b->filename && a->group == b->group;
1082 }
1083
1084 /**
1085  * tomoyo_same_number_union - Check for duplicated "struct tomoyo_number_union" entry.
1086  *
1087  * @a: Pointer to "struct tomoyo_number_union".
1088  * @b: Pointer to "struct tomoyo_number_union".
1089  *
1090  * Returns true if @a == @b, false otherwise.
1091  */
1092 static inline bool tomoyo_same_number_union
1093 (const struct tomoyo_number_union *a, const struct tomoyo_number_union *b)
1094 {
1095         return a->values[0] == b->values[0] && a->values[1] == b->values[1] &&
1096                 a->group == b->group && a->value_type[0] == b->value_type[0] &&
1097                 a->value_type[1] == b->value_type[1];
1098 }
1099
1100 /**
1101  * tomoyo_current_namespace - Get "struct tomoyo_policy_namespace" for current thread.
1102  *
1103  * Returns pointer to "struct tomoyo_policy_namespace" for current thread.
1104  */
1105 static inline struct tomoyo_policy_namespace *tomoyo_current_namespace(void)
1106 {
1107         return tomoyo_domain()->ns;
1108 }
1109
1110 #if defined(CONFIG_SLOB)
1111
1112 /**
1113  * tomoyo_round2 - Round up to power of 2 for calculating memory usage.
1114  *
1115  * @size: Size to be rounded up.
1116  *
1117  * Returns @size.
1118  *
1119  * Since SLOB does not round up, this function simply returns @size.
1120  */
1121 static inline int tomoyo_round2(size_t size)
1122 {
1123         return size;
1124 }
1125
1126 #else
1127
1128 /**
1129  * tomoyo_round2 - Round up to power of 2 for calculating memory usage.
1130  *
1131  * @size: Size to be rounded up.
1132  *
1133  * Returns rounded size.
1134  *
1135  * Strictly speaking, SLAB may be able to allocate (e.g.) 96 bytes instead of
1136  * (e.g.) 128 bytes.
1137  */
1138 static inline int tomoyo_round2(size_t size)
1139 {
1140 #if PAGE_SIZE == 4096
1141         size_t bsize = 32;
1142 #else
1143         size_t bsize = 64;
1144 #endif
1145         if (!size)
1146                 return 0;
1147         while (size > bsize)
1148                 bsize <<= 1;
1149         return bsize;
1150 }
1151
1152 #endif
1153
1154 /**
1155  * list_for_each_cookie - iterate over a list with cookie.
1156  * @pos:        the &struct list_head to use as a loop cursor.
1157  * @head:       the head for your list.
1158  */
1159 #define list_for_each_cookie(pos, head)                                 \
1160         if (!pos)                                                       \
1161                 pos =  srcu_dereference((head)->next, &tomoyo_ss);      \
1162         for ( ; pos != (head); pos = srcu_dereference(pos->next, &tomoyo_ss))
1163
1164 #endif /* !defined(_SECURITY_TOMOYO_COMMON_H) */