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_PATH1_UID,
  77         TOMOYO_PATH1_GID,
  78         TOMOYO_PATH1_INO,
  79         TOMOYO_PATH1_MAJOR,
  80         TOMOYO_PATH1_MINOR,
  81         TOMOYO_PATH1_PERM,
  82         TOMOYO_PATH1_TYPE,
  83         TOMOYO_PATH1_DEV_MAJOR,
  84         TOMOYO_PATH1_DEV_MINOR,
  85         TOMOYO_PATH2_UID,
  86         TOMOYO_PATH2_GID,
  87         TOMOYO_PATH2_INO,
  88         TOMOYO_PATH2_MAJOR,
  89         TOMOYO_PATH2_MINOR,
  90         TOMOYO_PATH2_PERM,
  91         TOMOYO_PATH2_TYPE,
  92         TOMOYO_PATH2_DEV_MAJOR,
  93         TOMOYO_PATH2_DEV_MINOR,
  94         TOMOYO_PATH1_PARENT_UID,
  95         TOMOYO_PATH1_PARENT_GID,
  96         TOMOYO_PATH1_PARENT_INO,
  97         TOMOYO_PATH1_PARENT_PERM,
  98         TOMOYO_PATH2_PARENT_UID,
  99         TOMOYO_PATH2_PARENT_GID,
 100         TOMOYO_PATH2_PARENT_INO,
 101         TOMOYO_PATH2_PARENT_PERM,
 102         TOMOYO_MAX_CONDITION_KEYWORD,
 103         TOMOYO_NUMBER_UNION,
 104 };
 105
 106
 107 /* Index numbers for stat(). */
 108 enum tomoyo_path_stat_index {
 109         /* Do not change this order. */
 110         TOMOYO_PATH1,
 111         TOMOYO_PATH1_PARENT,
 112         TOMOYO_PATH2,
 113         TOMOYO_PATH2_PARENT,
 114         TOMOYO_MAX_PATH_STAT
 115 };
 116
 117 /* Index numbers for operation mode. */
 118 enum tomoyo_mode_index {
 119         TOMOYO_CONFIG_DISABLED,
 120         TOMOYO_CONFIG_LEARNING,
 121         TOMOYO_CONFIG_PERMISSIVE,
 122         TOMOYO_CONFIG_ENFORCING,
 123         TOMOYO_CONFIG_MAX_MODE,
 124         TOMOYO_CONFIG_WANT_REJECT_LOG =  64,
 125         TOMOYO_CONFIG_WANT_GRANT_LOG  = 128,
 126         TOMOYO_CONFIG_USE_DEFAULT     = 255,
 127 };
 128
 129 /* Index numbers for entry type. */
 130 enum tomoyo_policy_id {
 131         TOMOYO_ID_GROUP,
 132         TOMOYO_ID_PATH_GROUP,
 133         TOMOYO_ID_NUMBER_GROUP,
 134         TOMOYO_ID_TRANSITION_CONTROL,
 135         TOMOYO_ID_AGGREGATOR,
 136         TOMOYO_ID_MANAGER,
 137         TOMOYO_ID_CONDITION,
 138         TOMOYO_ID_NAME,
 139         TOMOYO_ID_ACL,
 140         TOMOYO_ID_DOMAIN,
 141         TOMOYO_MAX_POLICY
 142 };
 143
 144 /* Index numbers for domain's attributes. */
 145 enum tomoyo_domain_info_flags_index {
 146         /* Quota warnning flag.   */
 147         TOMOYO_DIF_QUOTA_WARNED,
 148         /*
 149          * This domain was unable to create a new domain at
 150          * tomoyo_find_next_domain() because the name of the domain to be
 151          * created was too long or it could not allocate memory.
 152          * More than one process continued execve() without domain transition.
 153          */
 154         TOMOYO_DIF_TRANSITION_FAILED,
 155         TOMOYO_MAX_DOMAIN_INFO_FLAGS
 156 };
 157
 158 /* Index numbers for group entries. */
 159 enum tomoyo_group_id {
 160         TOMOYO_PATH_GROUP,
 161         TOMOYO_NUMBER_GROUP,
 162         TOMOYO_MAX_GROUP
 163 };
 164
 165 /* Index numbers for type of numeric values. */
 166 enum tomoyo_value_type {
 167         TOMOYO_VALUE_TYPE_INVALID,
 168         TOMOYO_VALUE_TYPE_DECIMAL,
 169         TOMOYO_VALUE_TYPE_OCTAL,
 170         TOMOYO_VALUE_TYPE_HEXADECIMAL,
 171 };
 172
 173 /* Index numbers for domain transition control keywords. */
 174 enum tomoyo_transition_type {
 175         /* Do not change this order, */
 176         TOMOYO_TRANSITION_CONTROL_NO_RESET,
 177         TOMOYO_TRANSITION_CONTROL_RESET,
 178         TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE,
 179         TOMOYO_TRANSITION_CONTROL_INITIALIZE,
 180         TOMOYO_TRANSITION_CONTROL_NO_KEEP,
 181         TOMOYO_TRANSITION_CONTROL_KEEP,
 182         TOMOYO_MAX_TRANSITION_TYPE
 183 };
 184
 185 /* Index numbers for Access Controls. */
 186 enum tomoyo_acl_entry_type_index {
 187         TOMOYO_TYPE_PATH_ACL,
 188         TOMOYO_TYPE_PATH2_ACL,
 189         TOMOYO_TYPE_PATH_NUMBER_ACL,
 190         TOMOYO_TYPE_MKDEV_ACL,
 191         TOMOYO_TYPE_MOUNT_ACL,
 192 };
 193
 194 /* Index numbers for access controls with one pathname. */
 195 enum tomoyo_path_acl_index {
 196         TOMOYO_TYPE_EXECUTE,
 197         TOMOYO_TYPE_READ,
 198         TOMOYO_TYPE_WRITE,
 199         TOMOYO_TYPE_APPEND,
 200         TOMOYO_TYPE_UNLINK,
 201         TOMOYO_TYPE_GETATTR,
 202         TOMOYO_TYPE_RMDIR,
 203         TOMOYO_TYPE_TRUNCATE,
 204         TOMOYO_TYPE_SYMLINK,
 205         TOMOYO_TYPE_CHROOT,
 206         TOMOYO_TYPE_UMOUNT,
 207         TOMOYO_MAX_PATH_OPERATION
 208 };
 209
 210 /* Index numbers for /sys/kernel/security/tomoyo/stat interface. */
 211 enum tomoyo_memory_stat_type {
 212         TOMOYO_MEMORY_POLICY,
 213         TOMOYO_MEMORY_AUDIT,
 214         TOMOYO_MEMORY_QUERY,
 215         TOMOYO_MAX_MEMORY_STAT
 216 };
 217
 218 enum tomoyo_mkdev_acl_index {
 219         TOMOYO_TYPE_MKBLOCK,
 220         TOMOYO_TYPE_MKCHAR,
 221         TOMOYO_MAX_MKDEV_OPERATION
 222 };
 223
 224 /* Index numbers for access controls with two pathnames. */
 225 enum tomoyo_path2_acl_index {
 226         TOMOYO_TYPE_LINK,
 227         TOMOYO_TYPE_RENAME,
 228         TOMOYO_TYPE_PIVOT_ROOT,
 229         TOMOYO_MAX_PATH2_OPERATION
 230 };
 231
 232 /* Index numbers for access controls with one pathname and one number. */
 233 enum tomoyo_path_number_acl_index {
 234         TOMOYO_TYPE_CREATE,
 235         TOMOYO_TYPE_MKDIR,
 236         TOMOYO_TYPE_MKFIFO,
 237         TOMOYO_TYPE_MKSOCK,
 238         TOMOYO_TYPE_IOCTL,
 239         TOMOYO_TYPE_CHMOD,
 240         TOMOYO_TYPE_CHOWN,
 241         TOMOYO_TYPE_CHGRP,
 242         TOMOYO_MAX_PATH_NUMBER_OPERATION
 243 };
 244
 245 /* Index numbers for /sys/kernel/security/tomoyo/ interfaces. */
 246 enum tomoyo_securityfs_interface_index {
 247         TOMOYO_DOMAINPOLICY,
 248         TOMOYO_EXCEPTIONPOLICY,
 249         TOMOYO_PROCESS_STATUS,
 250         TOMOYO_STAT,
 251         TOMOYO_SELFDOMAIN,
 252         TOMOYO_AUDIT,
 253         TOMOYO_VERSION,
 254         TOMOYO_PROFILE,
 255         TOMOYO_QUERY,
 256         TOMOYO_MANAGER
 257 };
 258
 259 /* Index numbers for special mount operations. */
 260 enum tomoyo_special_mount {
 261         TOMOYO_MOUNT_BIND,            /* mount --bind /source /dest   */
 262         TOMOYO_MOUNT_MOVE,            /* mount --move /old /new       */
 263         TOMOYO_MOUNT_REMOUNT,         /* mount -o remount /dir        */
 264         TOMOYO_MOUNT_MAKE_UNBINDABLE, /* mount --make-unbindable /dir */
 265         TOMOYO_MOUNT_MAKE_PRIVATE,    /* mount --make-private /dir    */
 266         TOMOYO_MOUNT_MAKE_SLAVE,      /* mount --make-slave /dir      */
 267         TOMOYO_MOUNT_MAKE_SHARED,     /* mount --make-shared /dir     */
 268         TOMOYO_MAX_SPECIAL_MOUNT
 269 };
 270
 271 /* Index numbers for functionality. */
 272 enum tomoyo_mac_index {
 273         TOMOYO_MAC_FILE_EXECUTE,
 274         TOMOYO_MAC_FILE_OPEN,
 275         TOMOYO_MAC_FILE_CREATE,
 276         TOMOYO_MAC_FILE_UNLINK,
 277         TOMOYO_MAC_FILE_GETATTR,
 278         TOMOYO_MAC_FILE_MKDIR,
 279         TOMOYO_MAC_FILE_RMDIR,
 280         TOMOYO_MAC_FILE_MKFIFO,
 281         TOMOYO_MAC_FILE_MKSOCK,
 282         TOMOYO_MAC_FILE_TRUNCATE,
 283         TOMOYO_MAC_FILE_SYMLINK,
 284         TOMOYO_MAC_FILE_MKBLOCK,
 285         TOMOYO_MAC_FILE_MKCHAR,
 286         TOMOYO_MAC_FILE_LINK,
 287         TOMOYO_MAC_FILE_RENAME,
 288         TOMOYO_MAC_FILE_CHMOD,
 289         TOMOYO_MAC_FILE_CHOWN,
 290         TOMOYO_MAC_FILE_CHGRP,
 291         TOMOYO_MAC_FILE_IOCTL,
 292         TOMOYO_MAC_FILE_CHROOT,
 293         TOMOYO_MAC_FILE_MOUNT,
 294         TOMOYO_MAC_FILE_UMOUNT,
 295         TOMOYO_MAC_FILE_PIVOT_ROOT,
 296         TOMOYO_MAX_MAC_INDEX
 297 };
 298
 299 /* Index numbers for category of functionality. */
 300 enum tomoyo_mac_category_index {
 301         TOMOYO_MAC_CATEGORY_FILE,
 302         TOMOYO_MAX_MAC_CATEGORY_INDEX
 303 };
 304
 305 /*
 306  * Retry this request. Returned by tomoyo_supervisor() if policy violation has
 307  * occurred in enforcing mode and the userspace daemon decided to retry.
 308  *
 309  * We must choose a positive value in order to distinguish "granted" (which is
 310  * 0) and "rejected" (which is a negative value) and "retry".
 311  */
 312 #define TOMOYO_RETRY_REQUEST 1
 313
 314 /* Index numbers for /sys/kernel/security/tomoyo/stat interface. */
 315 enum tomoyo_policy_stat_type {
 316         /* Do not change this order. */
 317         TOMOYO_STAT_POLICY_UPDATES,
 318         TOMOYO_STAT_POLICY_LEARNING,   /* == TOMOYO_CONFIG_LEARNING */
 319         TOMOYO_STAT_POLICY_PERMISSIVE, /* == TOMOYO_CONFIG_PERMISSIVE */
 320         TOMOYO_STAT_POLICY_ENFORCING,  /* == TOMOYO_CONFIG_ENFORCING */
 321         TOMOYO_MAX_POLICY_STAT
 322 };
 323
 324 /* Index numbers for profile's PREFERENCE values. */
 325 enum tomoyo_pref_index {
 326         TOMOYO_PREF_MAX_AUDIT_LOG,
 327         TOMOYO_PREF_MAX_LEARNING_ENTRY,
 328         TOMOYO_MAX_PREF
 329 };
 330
 331 /********** Structure definitions. **********/
 332
 333 /* Common header for holding ACL entries. */
 334 struct tomoyo_acl_head {
 335         struct list_head list;
 336         bool is_deleted;
 337 } __packed;
 338
 339 /* Common header for shared entries. */
 340 struct tomoyo_shared_acl_head {
 341         struct list_head list;
 342         atomic_t users;
 343 } __packed;
 344
 345 struct tomoyo_policy_namespace;
 346
 347 /* Structure for request info. */
 348 struct tomoyo_request_info {
 349         /*
 350          * For holding parameters specific to operations which deal files.
 351          * NULL if not dealing files.
 352          */
 353         struct tomoyo_obj_info *obj;
 354         struct tomoyo_domain_info *domain;
 355         /* For holding parameters. */
 356         union {
 357                 struct {
 358                         const struct tomoyo_path_info *filename;
 359                         /* For using wildcards at tomoyo_find_next_domain(). */
 360                         const struct tomoyo_path_info *matched_path;
 361                         /* One of values in "enum tomoyo_path_acl_index". */
 362                         u8 operation;
 363                 } path;
 364                 struct {
 365                         const struct tomoyo_path_info *filename1;
 366                         const struct tomoyo_path_info *filename2;
 367                         /* One of values in "enum tomoyo_path2_acl_index". */
 368                         u8 operation;
 369                 } path2;
 370                 struct {
 371                         const struct tomoyo_path_info *filename;
 372                         unsigned int mode;
 373                         unsigned int major;
 374                         unsigned int minor;
 375                         /* One of values in "enum tomoyo_mkdev_acl_index". */
 376                         u8 operation;
 377                 } mkdev;
 378                 struct {
 379                         const struct tomoyo_path_info *filename;
 380                         unsigned long number;
 381                         /*
 382                          * One of values in
 383                          * "enum tomoyo_path_number_acl_index".
 384                          */
 385                         u8 operation;
 386                 } path_number;
 387                 struct {
 388                         const struct tomoyo_path_info *type;
 389                         const struct tomoyo_path_info *dir;
 390                         const struct tomoyo_path_info *dev;
 391                         unsigned long flags;
 392                         int need_dev;
 393                 } mount;
 394         } param;
 395         u8 param_type;
 396         bool granted;
 397         u8 retry;
 398         u8 profile;
 399         u8 mode; /* One of tomoyo_mode_index . */
 400         u8 type;
 401 };
 402
 403 /* Structure for holding a token. */
 404 struct tomoyo_path_info {
 405         const char *name;
 406         u32 hash;          /* = full_name_hash(name, strlen(name)) */
 407         u16 const_len;     /* = tomoyo_const_part_length(name)     */
 408         bool is_dir;       /* = tomoyo_strendswith(name, "/")      */
 409         bool is_patterned; /* = tomoyo_path_contains_pattern(name) */
 410 };
 411
 412 /* Structure for holding string data. */
 413 struct tomoyo_name {
 414         struct tomoyo_shared_acl_head head;
 415         struct tomoyo_path_info entry;
 416 };
 417
 418 /* Structure for holding a word. */
 419 struct tomoyo_name_union {
 420         /* Either @filename or @group is NULL. */
 421         const struct tomoyo_path_info *filename;
 422         struct tomoyo_group *group;
 423 };
 424
 425 /* Structure for holding a number. */
 426 struct tomoyo_number_union {
 427         unsigned long values[2];
 428         struct tomoyo_group *group; /* Maybe NULL. */
 429         /* One of values in "enum tomoyo_value_type". */
 430         u8 value_type[2];
 431 };
 432
 433 /* Structure for "path_group"/"number_group" directive. */
 434 struct tomoyo_group {
 435         struct tomoyo_shared_acl_head head;
 436         const struct tomoyo_path_info *group_name;
 437         struct list_head member_list;
 438 };
 439
 440 /* Structure for "path_group" directive. */
 441 struct tomoyo_path_group {
 442         struct tomoyo_acl_head head;
 443         const struct tomoyo_path_info *member_name;
 444 };
 445
 446 /* Structure for "number_group" directive. */
 447 struct tomoyo_number_group {
 448         struct tomoyo_acl_head head;
 449         struct tomoyo_number_union number;
 450 };
 451
 452 /* Subset of "struct stat". Used by conditional ACL and audit logs. */
 453 struct tomoyo_mini_stat {
 454         uid_t uid;
 455         gid_t gid;
 456         ino_t ino;
 457         mode_t mode;
 458         dev_t dev;
 459         dev_t rdev;
 460 };
 461
 462 /* Structure for attribute checks in addition to pathname checks. */
 463 struct tomoyo_obj_info {
 464         /*
 465          * True if tomoyo_get_attributes() was already called, false otherwise.
 466          */
 467         bool validate_done;
 468         /* True if @stat[] is valid. */
 469         bool stat_valid[TOMOYO_MAX_PATH_STAT];
 470         /* First pathname. Initialized with { NULL, NULL } if no path. */
 471         struct path path1;
 472         /* Second pathname. Initialized with { NULL, NULL } if no path. */
 473         struct path path2;
 474         /*
 475          * Information on @path1, @path1's parent directory, @path2, @path2's
 476          * parent directory.
 477          */
 478         struct tomoyo_mini_stat stat[TOMOYO_MAX_PATH_STAT];
 479 };
 480
 481 /* Structure for entries which follows "struct tomoyo_condition". */
 482 struct tomoyo_condition_element {
 483         /* Left hand operand. */
 484         u8 left;
 485         /* Right hand operand. */
 486         u8 right;
 487         /* Equation operator. True if equals or overlaps, false otherwise. */
 488         bool equals;
 489 };
 490
 491 /* Structure for optional arguments. */
 492 struct tomoyo_condition {
 493         struct tomoyo_shared_acl_head head;
 494         u32 size; /* Memory size allocated for this entry. */
 495         u16 condc; /* Number of conditions in this struct. */
 496         u16 numbers_count; /* Number of "struct tomoyo_number_union values". */
 497         /*
 498          * struct tomoyo_condition_element condition[condc];
 499          * struct tomoyo_number_union values[numbers_count];
 500          */
 501 };
 502
 503 /* Common header for individual entries. */
 504 struct tomoyo_acl_info {
 505         struct list_head list;
 506         struct tomoyo_condition *cond; /* Maybe NULL. */
 507         bool is_deleted;
 508         u8 type; /* One of values in "enum tomoyo_acl_entry_type_index". */
 509 } __packed;
 510
 511 /* Structure for domain information. */
 512 struct tomoyo_domain_info {
 513         struct list_head list;
 514         struct list_head acl_info_list;
 515         /* Name of this domain. Never NULL.          */
 516         const struct tomoyo_path_info *domainname;
 517         /* Namespace for this domain. Never NULL. */
 518         struct tomoyo_policy_namespace *ns;
 519         u8 profile;        /* Profile number to use. */
 520         u8 group;          /* Group number to use.   */
 521         bool is_deleted;   /* Delete flag.           */
 522         bool flags[TOMOYO_MAX_DOMAIN_INFO_FLAGS];
 523         atomic_t users; /* Number of referring credentials. */
 524 };
 525
 526 /*
 527  * Structure for "file execute", "file read", "file write", "file append",
 528  * "file unlink", "file getattr", "file rmdir", "file truncate",
 529  * "file symlink", "file chroot" and "file unmount" directive.
 530  */
 531 struct tomoyo_path_acl {
 532         struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_PATH_ACL */
 533         u16 perm; /* Bitmask of values in "enum tomoyo_path_acl_index". */
 534         struct tomoyo_name_union name;
 535 };
 536
 537 /*
 538  * Structure for "file create", "file mkdir", "file mkfifo", "file mksock",
 539  * "file ioctl", "file chmod", "file chown" and "file chgrp" directive.
 540  */
 541 struct tomoyo_path_number_acl {
 542         struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_PATH_NUMBER_ACL */
 543         /* Bitmask of values in "enum tomoyo_path_number_acl_index". */
 544         u8 perm;
 545         struct tomoyo_name_union name;
 546         struct tomoyo_number_union number;
 547 };
 548
 549 /* Structure for "file mkblock" and "file mkchar" directive. */
 550 struct tomoyo_mkdev_acl {
 551         struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_MKDEV_ACL */
 552         u8 perm; /* Bitmask of values in "enum tomoyo_mkdev_acl_index". */
 553         struct tomoyo_name_union name;
 554         struct tomoyo_number_union mode;
 555         struct tomoyo_number_union major;
 556         struct tomoyo_number_union minor;
 557 };
 558
 559 /*
 560  * Structure for "file rename", "file link" and "file pivot_root" directive.
 561  */
 562 struct tomoyo_path2_acl {
 563         struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_PATH2_ACL */
 564         u8 perm; /* Bitmask of values in "enum tomoyo_path2_acl_index". */
 565         struct tomoyo_name_union name1;
 566         struct tomoyo_name_union name2;
 567 };
 568
 569 /* Structure for "file mount" directive. */
 570 struct tomoyo_mount_acl {
 571         struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_MOUNT_ACL */
 572         struct tomoyo_name_union dev_name;
 573         struct tomoyo_name_union dir_name;
 574         struct tomoyo_name_union fs_type;
 575         struct tomoyo_number_union flags;
 576 };
 577
 578 /* Structure for holding a line from /sys/kernel/security/tomoyo/ interface. */
 579 struct tomoyo_acl_param {
 580         char *data;
 581         struct list_head *list;
 582         struct tomoyo_policy_namespace *ns;
 583         bool is_delete;
 584 };
 585
 586 #define TOMOYO_MAX_IO_READ_QUEUE 64
 587
 588 /*
 589  * Structure for reading/writing policy via /sys/kernel/security/tomoyo
 590  * interfaces.
 591  */
 592 struct tomoyo_io_buffer {
 593         void (*read) (struct tomoyo_io_buffer *);
 594         int (*write) (struct tomoyo_io_buffer *);
 595         int (*poll) (struct file *file, poll_table *wait);
 596         /* Exclusive lock for this structure.   */
 597         struct mutex io_sem;
 598         char __user *read_user_buf;
 599         size_t read_user_buf_avail;
 600         struct {
 601                 struct list_head *ns;
 602                 struct list_head *domain;
 603                 struct list_head *group;
 604                 struct list_head *acl;
 605                 size_t avail;
 606                 unsigned int step;
 607                 unsigned int query_index;
 608                 u16 index;
 609                 u16 cond_index;
 610                 u8 acl_group_index;
 611                 u8 cond_step;
 612                 u8 bit;
 613                 u8 w_pos;
 614                 bool eof;
 615                 bool print_this_domain_only;
 616                 bool print_transition_related_only;
 617                 bool print_cond_part;
 618                 const char *w[TOMOYO_MAX_IO_READ_QUEUE];
 619         } r;
 620         struct {
 621                 struct tomoyo_policy_namespace *ns;
 622                 /* The position currently writing to.   */
 623                 struct tomoyo_domain_info *domain;
 624                 /* Bytes available for writing.         */
 625                 size_t avail;
 626                 bool is_delete;
 627         } w;
 628         /* Buffer for reading.                  */
 629         char *read_buf;
 630         /* Size of read buffer.                 */
 631         size_t readbuf_size;
 632         /* Buffer for writing.                  */
 633         char *write_buf;
 634         /* Size of write buffer.                */
 635         size_t writebuf_size;
 636         /* Type of this interface.              */
 637         enum tomoyo_securityfs_interface_index type;
 638         /* Users counter protected by tomoyo_io_buffer_list_lock. */
 639         u8 users;
 640         /* List for telling GC not to kfree() elements. */
 641         struct list_head list;
 642 };
 643
 644 /*
 645  * Structure for "initialize_domain"/"no_initialize_domain"/"keep_domain"/
 646  * "no_keep_domain" keyword.
 647  */
 648 struct tomoyo_transition_control {
 649         struct tomoyo_acl_head head;
 650         u8 type; /* One of values in "enum tomoyo_transition_type".  */
 651         /* True if the domainname is tomoyo_get_last_name(). */
 652         bool is_last_name;
 653         const struct tomoyo_path_info *domainname; /* Maybe NULL */
 654         const struct tomoyo_path_info *program;    /* Maybe NULL */
 655 };
 656
 657 /* Structure for "aggregator" keyword. */
 658 struct tomoyo_aggregator {
 659         struct tomoyo_acl_head head;
 660         const struct tomoyo_path_info *original_name;
 661         const struct tomoyo_path_info *aggregated_name;
 662 };
 663
 664 /* Structure for policy manager. */
 665 struct tomoyo_manager {
 666         struct tomoyo_acl_head head;
 667         bool is_domain;  /* True if manager is a domainname. */
 668         /* A path to program or a domainname. */
 669         const struct tomoyo_path_info *manager;
 670 };
 671
 672 struct tomoyo_preference {
 673         unsigned int learning_max_entry;
 674         bool enforcing_verbose;
 675         bool learning_verbose;
 676         bool permissive_verbose;
 677 };
 678
 679 /* Structure for /sys/kernel/security/tomnoyo/profile interface. */
 680 struct tomoyo_profile {
 681         const struct tomoyo_path_info *comment;
 682         struct tomoyo_preference *learning;
 683         struct tomoyo_preference *permissive;
 684         struct tomoyo_preference *enforcing;
 685         struct tomoyo_preference preference;
 686         u8 default_config;
 687         u8 config[TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX];
 688         unsigned int pref[TOMOYO_MAX_PREF];
 689 };
 690
 691 /* Structure for representing YYYY/MM/DD hh/mm/ss. */
 692 struct tomoyo_time {
 693         u16 year;
 694         u8 month;
 695         u8 day;
 696         u8 hour;
 697         u8 min;
 698         u8 sec;
 699 };
 700
 701 /* Structure for policy namespace. */
 702 struct tomoyo_policy_namespace {
 703         /* Profile table. Memory is allocated as needed. */
 704         struct tomoyo_profile *profile_ptr[TOMOYO_MAX_PROFILES];
 705         /* List of "struct tomoyo_group". */
 706         struct list_head group_list[TOMOYO_MAX_GROUP];
 707         /* List of policy. */
 708         struct list_head policy_list[TOMOYO_MAX_POLICY];
 709         /* The global ACL referred by "use_group" keyword. */
 710         struct list_head acl_group[TOMOYO_MAX_ACL_GROUPS];
 711         /* List for connecting to tomoyo_namespace_list list. */
 712         struct list_head namespace_list;
 713         /* Profile version. Currently only 20100903 is defined. */
 714         unsigned int profile_version;
 715         /* Name of this namespace (e.g. "<kernel>", "</usr/sbin/httpd>" ). */
 716         const char *name;
 717 };
 718
 719 /********** Function prototypes. **********/
 720
 721 bool tomoyo_compare_number_union(const unsigned long value,
 722                                  const struct tomoyo_number_union *ptr);
 723 bool tomoyo_condition(struct tomoyo_request_info *r,
 724                       const struct tomoyo_condition *cond);
 725 bool tomoyo_correct_domain(const unsigned char *domainname);
 726 bool tomoyo_correct_path(const char *filename);
 727 bool tomoyo_correct_word(const char *string);
 728 bool tomoyo_domain_def(const unsigned char *buffer);
 729 bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r);
 730 bool tomoyo_memory_ok(void *ptr);
 731 bool tomoyo_number_matches_group(const unsigned long min,
 732                                  const unsigned long max,
 733                                  const struct tomoyo_group *group);
 734 bool tomoyo_parse_name_union(struct tomoyo_acl_param *param,
 735                              struct tomoyo_name_union *ptr);
 736 bool tomoyo_parse_number_union(struct tomoyo_acl_param *param,
 737                                struct tomoyo_number_union *ptr);
 738 bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename,
 739                                  const struct tomoyo_path_info *pattern);
 740 bool tomoyo_permstr(const char *string, const char *keyword);
 741 bool tomoyo_str_starts(char **src, const char *find);
 742 char *tomoyo_encode(const char *str);
 743 char *tomoyo_init_log(struct tomoyo_request_info *r, int len, const char *fmt,
 744                       va_list args);
 745 char *tomoyo_read_token(struct tomoyo_acl_param *param);
 746 char *tomoyo_realpath_from_path(struct path *path);
 747 char *tomoyo_realpath_nofollow(const char *pathname);
 748 const char *tomoyo_get_exe(void);
 749 const char *tomoyo_yesno(const unsigned int value);
 750 const struct tomoyo_path_info *tomoyo_compare_name_union
 751 (const struct tomoyo_path_info *name, const struct tomoyo_name_union *ptr);
 752 const struct tomoyo_path_info *tomoyo_get_name(const char *name);
 753 const struct tomoyo_path_info *tomoyo_path_matches_group
 754 (const struct tomoyo_path_info *pathname, const struct tomoyo_group *group);
 755 int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
 756                                  struct path *path, const int flag);
 757 int tomoyo_close_control(struct tomoyo_io_buffer *head);
 758 int tomoyo_find_next_domain(struct linux_binprm *bprm);
 759 int tomoyo_get_mode(const struct tomoyo_policy_namespace *ns, const u8 profile,
 760                     const u8 index);
 761 int tomoyo_init_request_info(struct tomoyo_request_info *r,
 762                              struct tomoyo_domain_info *domain,
 763                              const u8 index);
 764 int tomoyo_mkdev_perm(const u8 operation, struct path *path,
 765                       const unsigned int mode, unsigned int dev);
 766 int tomoyo_mount_permission(char *dev_name, struct path *path,
 767                             const char *type, unsigned long flags,
 768                             void *data_page);
 769 int tomoyo_open_control(const u8 type, struct file *file);
 770 int tomoyo_path2_perm(const u8 operation, struct path *path1,
 771                       struct path *path2);
 772 int tomoyo_path_number_perm(const u8 operation, struct path *path,
 773                             unsigned long number);
 774 int tomoyo_path_perm(const u8 operation, struct path *path);
 775 int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation,
 776                            const struct tomoyo_path_info *filename);
 777 int tomoyo_poll_control(struct file *file, poll_table *wait);
 778 int tomoyo_poll_log(struct file *file, poll_table *wait);
 779 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
 780         __printf(2, 3);
 781 int tomoyo_update_domain(struct tomoyo_acl_info *new_entry, const int size,
 782                          struct tomoyo_acl_param *param,
 783                          bool (*check_duplicate)
 784                          (const struct tomoyo_acl_info *,
 785                           const struct tomoyo_acl_info *),
 786                          bool (*merge_duplicate)
 787                          (struct tomoyo_acl_info *, struct tomoyo_acl_info *,
 788                           const bool));
 789 int tomoyo_update_policy(struct tomoyo_acl_head *new_entry, const int size,
 790                          struct tomoyo_acl_param *param,
 791                          bool (*check_duplicate)
 792                          (const struct tomoyo_acl_head *,
 793                           const struct tomoyo_acl_head *));
 794 int tomoyo_write_aggregator(struct tomoyo_acl_param *param);
 795 int tomoyo_write_file(struct tomoyo_acl_param *param);
 796 int tomoyo_write_group(struct tomoyo_acl_param *param, const u8 type);
 797 int tomoyo_write_transition_control(struct tomoyo_acl_param *param,
 798                                     const u8 type);
 799 ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
 800                             const int buffer_len);
 801 ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
 802                              const char __user *buffer, const int buffer_len);
 803 struct tomoyo_condition *tomoyo_get_condition(struct tomoyo_acl_param *param);
 804 struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname,
 805                                                 const bool transit);
 806 struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname);
 807 struct tomoyo_group *tomoyo_get_group(struct tomoyo_acl_param *param,
 808                                       const u8 idx);
 809 struct tomoyo_policy_namespace *tomoyo_assign_namespace
 810 (const char *domainname);
 811 struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns,
 812                                       const u8 profile);
 813 unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain,
 814                                 const u8 index);
 815 u8 tomoyo_parse_ulong(unsigned long *result, char **str);
 816 void *tomoyo_commit_ok(void *data, const unsigned int size);
 817 void __init tomoyo_load_builtin_policy(void);
 818 void __init tomoyo_mm_init(void);
 819 void tomoyo_check_acl(struct tomoyo_request_info *r,
 820                       bool (*check_entry) (struct tomoyo_request_info *,
 821                                            const struct tomoyo_acl_info *));
 822 void tomoyo_check_profile(void);
 823 void tomoyo_convert_time(time_t time, struct tomoyo_time *stamp);
 824 void tomoyo_del_condition(struct list_head *element);
 825 void tomoyo_fill_path_info(struct tomoyo_path_info *ptr);
 826 void tomoyo_get_attributes(struct tomoyo_obj_info *obj);
 827 void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns);
 828 void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
 829          __printf(2, 3);
 830 void tomoyo_load_policy(const char *filename);
 831 void tomoyo_memory_free(void *ptr);
 832 void tomoyo_normalize_line(unsigned char *buffer);
 833 void tomoyo_notify_gc(struct tomoyo_io_buffer *head, const bool is_register);
 834 void tomoyo_print_ulong(char *buffer, const int buffer_len,
 835                         const unsigned long value, const u8 type);
 836 void tomoyo_put_name_union(struct tomoyo_name_union *ptr);
 837 void tomoyo_put_number_union(struct tomoyo_number_union *ptr);
 838 void tomoyo_read_log(struct tomoyo_io_buffer *head);
 839 void tomoyo_update_stat(const u8 index);
 840 void tomoyo_warn_oom(const char *function);
 841 void tomoyo_write_log(struct tomoyo_request_info *r, const char *fmt, ...)
 842         __printf(2, 3);
 843 void tomoyo_write_log2(struct tomoyo_request_info *r, int len, const char *fmt,
 844                        va_list args);
 845
 846 /********** External variable definitions. **********/
 847
 848 extern bool tomoyo_policy_loaded;
 849 extern const char * const tomoyo_condition_keyword
 850 [TOMOYO_MAX_CONDITION_KEYWORD];
 851 extern const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS];
 852 extern const char * const tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
 853                                               + TOMOYO_MAX_MAC_CATEGORY_INDEX];
 854 extern const char * const tomoyo_mode[TOMOYO_CONFIG_MAX_MODE];
 855 extern const char * const tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION];
 856 extern const u8 tomoyo_index2category[TOMOYO_MAX_MAC_INDEX];
 857 extern const u8 tomoyo_pn2mac[TOMOYO_MAX_PATH_NUMBER_OPERATION];
 858 extern const u8 tomoyo_pnnn2mac[TOMOYO_MAX_MKDEV_OPERATION];
 859 extern const u8 tomoyo_pp2mac[TOMOYO_MAX_PATH2_OPERATION];
 860 extern struct list_head tomoyo_condition_list;
 861 extern struct list_head tomoyo_domain_list;
 862 extern struct list_head tomoyo_name_list[TOMOYO_MAX_HASH];
 863 extern struct list_head tomoyo_namespace_list;
 864 extern struct mutex tomoyo_policy_lock;
 865 extern struct srcu_struct tomoyo_ss;
 866 extern struct tomoyo_domain_info tomoyo_kernel_domain;
 867 extern struct tomoyo_policy_namespace tomoyo_kernel_namespace;
 868 extern unsigned int tomoyo_memory_quota[TOMOYO_MAX_MEMORY_STAT];
 869 extern unsigned int tomoyo_memory_used[TOMOYO_MAX_MEMORY_STAT];
 870
 871 /********** Inlined functions. **********/
 872
 873 /**
 874  * tomoyo_read_lock - Take lock for protecting policy.
 875  *
 876  * Returns index number for tomoyo_read_unlock().
 877  */
 878 static inline int tomoyo_read_lock(void)
 879 {
 880         return srcu_read_lock(&tomoyo_ss);
 881 }
 882
 883 /**
 884  * tomoyo_read_unlock - Release lock for protecting policy.
 885  *
 886  * @idx: Index number returned by tomoyo_read_lock().
 887  *
 888  * Returns nothing.
 889  */
 890 static inline void tomoyo_read_unlock(int idx)
 891 {
 892         srcu_read_unlock(&tomoyo_ss, idx);
 893 }
 894
 895 /**
 896  * tomoyo_sys_getppid - Copy of getppid().
 897  *
 898  * Returns parent process's PID.
 899  *
 900  * Alpha does not have getppid() defined. To be able to build this module on
 901  * Alpha, I have to copy getppid() from kernel/timer.c.
 902  */
 903 static inline pid_t tomoyo_sys_getppid(void)
 904 {
 905         pid_t pid;
 906         rcu_read_lock();
 907         pid = task_tgid_vnr(current->real_parent);
 908         rcu_read_unlock();
 909         return pid;
 910 }
 911
 912 /**
 913  * tomoyo_sys_getpid - Copy of getpid().
 914  *
 915  * Returns current thread's PID.
 916  *
 917  * Alpha does not have getpid() defined. To be able to build this module on
 918  * Alpha, I have to copy getpid() from kernel/timer.c.
 919  */
 920 static inline pid_t tomoyo_sys_getpid(void)
 921 {
 922         return task_tgid_vnr(current);
 923 }
 924
 925 /**
 926  * tomoyo_pathcmp - strcmp() for "struct tomoyo_path_info" structure.
 927  *
 928  * @a: Pointer to "struct tomoyo_path_info".
 929  * @b: Pointer to "struct tomoyo_path_info".
 930  *
 931  * Returns true if @a == @b, false otherwise.
 932  */
 933 static inline bool tomoyo_pathcmp(const struct tomoyo_path_info *a,
 934                                   const struct tomoyo_path_info *b)
 935 {
 936         return a->hash != b->hash || strcmp(a->name, b->name);
 937 }
 938
 939 /**
 940  * tomoyo_put_name - Drop reference on "struct tomoyo_name".
 941  *
 942  * @name: Pointer to "struct tomoyo_path_info". Maybe NULL.
 943  *
 944  * Returns nothing.
 945  */
 946 static inline void tomoyo_put_name(const struct tomoyo_path_info *name)
 947 {
 948         if (name) {
 949                 struct tomoyo_name *ptr =
 950                         container_of(name, typeof(*ptr), entry);
 951                 atomic_dec(&ptr->head.users);
 952         }
 953 }
 954
 955 /**
 956  * tomoyo_put_condition - Drop reference on "struct tomoyo_condition".
 957  *
 958  * @cond: Pointer to "struct tomoyo_condition". Maybe NULL.
 959  *
 960  * Returns nothing.
 961  */
 962 static inline void tomoyo_put_condition(struct tomoyo_condition *cond)
 963 {
 964         if (cond)
 965                 atomic_dec(&cond->head.users);
 966 }
 967
 968 /**
 969  * tomoyo_put_group - Drop reference on "struct tomoyo_group".
 970  *
 971  * @group: Pointer to "struct tomoyo_group". Maybe NULL.
 972  *
 973  * Returns nothing.
 974  */
 975 static inline void tomoyo_put_group(struct tomoyo_group *group)
 976 {
 977         if (group)
 978                 atomic_dec(&group->head.users);
 979 }
 980
 981 /**
 982  * tomoyo_domain - Get "struct tomoyo_domain_info" for current thread.
 983  *
 984  * Returns pointer to "struct tomoyo_domain_info" for current thread.
 985  */
 986 static inline struct tomoyo_domain_info *tomoyo_domain(void)
 987 {
 988         return current_cred()->security;
 989 }
 990
 991 /**
 992  * tomoyo_real_domain - Get "struct tomoyo_domain_info" for specified thread.
 993  *
 994  * @task: Pointer to "struct task_struct".
 995  *
 996  * Returns pointer to "struct tomoyo_security" for specified thread.
 997  */
 998 static inline struct tomoyo_domain_info *tomoyo_real_domain(struct task_struct
 999                                                             *task)
1000 {
1001         return task_cred_xxx(task, security);
1002 }
1003
1004 /**
1005  * tomoyo_same_name_union - Check for duplicated "struct tomoyo_name_union" entry.
1006  *
1007  * @a: Pointer to "struct tomoyo_name_union".
1008  * @b: Pointer to "struct tomoyo_name_union".
1009  *
1010  * Returns true if @a == @b, false otherwise.
1011  */
1012 static inline bool tomoyo_same_name_union
1013 (const struct tomoyo_name_union *a, const struct tomoyo_name_union *b)
1014 {
1015         return a->filename == b->filename && a->group == b->group;
1016 }
1017
1018 /**
1019  * tomoyo_same_number_union - Check for duplicated "struct tomoyo_number_union" entry.
1020  *
1021  * @a: Pointer to "struct tomoyo_number_union".
1022  * @b: Pointer to "struct tomoyo_number_union".
1023  *
1024  * Returns true if @a == @b, false otherwise.
1025  */
1026 static inline bool tomoyo_same_number_union
1027 (const struct tomoyo_number_union *a, const struct tomoyo_number_union *b)
1028 {
1029         return a->values[0] == b->values[0] && a->values[1] == b->values[1] &&
1030                 a->group == b->group && a->value_type[0] == b->value_type[0] &&
1031                 a->value_type[1] == b->value_type[1];
1032 }
1033
1034 /**
1035  * tomoyo_current_namespace - Get "struct tomoyo_policy_namespace" for current thread.
1036  *
1037  * Returns pointer to "struct tomoyo_policy_namespace" for current thread.
1038  */
1039 static inline struct tomoyo_policy_namespace *tomoyo_current_namespace(void)
1040 {
1041         return tomoyo_domain()->ns;
1042 }
1043
1044 #if defined(CONFIG_SLOB)
1045
1046 /**
1047  * tomoyo_round2 - Round up to power of 2 for calculating memory usage.
1048  *
1049  * @size: Size to be rounded up.
1050  *
1051  * Returns @size.
1052  *
1053  * Since SLOB does not round up, this function simply returns @size.
1054  */
1055 static inline int tomoyo_round2(size_t size)
1056 {
1057         return size;
1058 }
1059
1060 #else
1061
1062 /**
1063  * tomoyo_round2 - Round up to power of 2 for calculating memory usage.
1064  *
1065  * @size: Size to be rounded up.
1066  *
1067  * Returns rounded size.
1068  *
1069  * Strictly speaking, SLAB may be able to allocate (e.g.) 96 bytes instead of
1070  * (e.g.) 128 bytes.
1071  */
1072 static inline int tomoyo_round2(size_t size)
1073 {
1074 #if PAGE_SIZE == 4096
1075         size_t bsize = 32;
1076 #else
1077         size_t bsize = 64;
1078 #endif
1079         if (!size)
1080                 return 0;
1081         while (size > bsize)
1082                 bsize <<= 1;
1083         return bsize;
1084 }
1085
1086 #endif
1087
1088 /**
1089  * list_for_each_cookie - iterate over a list with cookie.
1090  * @pos:        the &struct list_head to use as a loop cursor.
1091  * @head:       the head for your list.
1092  */
1093 #define list_for_each_cookie(pos, head)                                 \
1094         if (!pos)                                                       \
1095                 pos =  srcu_dereference((head)->next, &tomoyo_ss);      \
1096         for ( ; pos != (head); pos = srcu_dereference(pos->next, &tomoyo_ss))
1097
1098 #endif /* !defined(_SECURITY_TOMOYO_COMMON_H) */