linux/security/tomoyo/common.c
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   1/*
   2 * security/tomoyo/common.c
   3 *
   4 * Copyright (C) 2005-2011  NTT DATA CORPORATION
   5 */
   6
   7#include <linux/uaccess.h>
   8#include <linux/slab.h>
   9#include <linux/security.h>
  10#include "common.h"
  11
  12/* String table for operation mode. */
  13const char * const tomoyo_mode[TOMOYO_CONFIG_MAX_MODE] = {
  14        [TOMOYO_CONFIG_DISABLED]   = "disabled",
  15        [TOMOYO_CONFIG_LEARNING]   = "learning",
  16        [TOMOYO_CONFIG_PERMISSIVE] = "permissive",
  17        [TOMOYO_CONFIG_ENFORCING]  = "enforcing"
  18};
  19
  20/* String table for /sys/kernel/security/tomoyo/profile */
  21const char * const tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
  22                                       + TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
  23        /* CONFIG::file group */
  24        [TOMOYO_MAC_FILE_EXECUTE]    = "execute",
  25        [TOMOYO_MAC_FILE_OPEN]       = "open",
  26        [TOMOYO_MAC_FILE_CREATE]     = "create",
  27        [TOMOYO_MAC_FILE_UNLINK]     = "unlink",
  28        [TOMOYO_MAC_FILE_GETATTR]    = "getattr",
  29        [TOMOYO_MAC_FILE_MKDIR]      = "mkdir",
  30        [TOMOYO_MAC_FILE_RMDIR]      = "rmdir",
  31        [TOMOYO_MAC_FILE_MKFIFO]     = "mkfifo",
  32        [TOMOYO_MAC_FILE_MKSOCK]     = "mksock",
  33        [TOMOYO_MAC_FILE_TRUNCATE]   = "truncate",
  34        [TOMOYO_MAC_FILE_SYMLINK]    = "symlink",
  35        [TOMOYO_MAC_FILE_MKBLOCK]    = "mkblock",
  36        [TOMOYO_MAC_FILE_MKCHAR]     = "mkchar",
  37        [TOMOYO_MAC_FILE_LINK]       = "link",
  38        [TOMOYO_MAC_FILE_RENAME]     = "rename",
  39        [TOMOYO_MAC_FILE_CHMOD]      = "chmod",
  40        [TOMOYO_MAC_FILE_CHOWN]      = "chown",
  41        [TOMOYO_MAC_FILE_CHGRP]      = "chgrp",
  42        [TOMOYO_MAC_FILE_IOCTL]      = "ioctl",
  43        [TOMOYO_MAC_FILE_CHROOT]     = "chroot",
  44        [TOMOYO_MAC_FILE_MOUNT]      = "mount",
  45        [TOMOYO_MAC_FILE_UMOUNT]     = "unmount",
  46        [TOMOYO_MAC_FILE_PIVOT_ROOT] = "pivot_root",
  47        /* CONFIG::network group */
  48        [TOMOYO_MAC_NETWORK_INET_STREAM_BIND]       = "inet_stream_bind",
  49        [TOMOYO_MAC_NETWORK_INET_STREAM_LISTEN]     = "inet_stream_listen",
  50        [TOMOYO_MAC_NETWORK_INET_STREAM_CONNECT]    = "inet_stream_connect",
  51        [TOMOYO_MAC_NETWORK_INET_DGRAM_BIND]        = "inet_dgram_bind",
  52        [TOMOYO_MAC_NETWORK_INET_DGRAM_SEND]        = "inet_dgram_send",
  53        [TOMOYO_MAC_NETWORK_INET_RAW_BIND]          = "inet_raw_bind",
  54        [TOMOYO_MAC_NETWORK_INET_RAW_SEND]          = "inet_raw_send",
  55        [TOMOYO_MAC_NETWORK_UNIX_STREAM_BIND]       = "unix_stream_bind",
  56        [TOMOYO_MAC_NETWORK_UNIX_STREAM_LISTEN]     = "unix_stream_listen",
  57        [TOMOYO_MAC_NETWORK_UNIX_STREAM_CONNECT]    = "unix_stream_connect",
  58        [TOMOYO_MAC_NETWORK_UNIX_DGRAM_BIND]        = "unix_dgram_bind",
  59        [TOMOYO_MAC_NETWORK_UNIX_DGRAM_SEND]        = "unix_dgram_send",
  60        [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_BIND]    = "unix_seqpacket_bind",
  61        [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_LISTEN]  = "unix_seqpacket_listen",
  62        [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_CONNECT] = "unix_seqpacket_connect",
  63        /* CONFIG::misc group */
  64        [TOMOYO_MAC_ENVIRON] = "env",
  65        /* CONFIG group */
  66        [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file",
  67        [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_NETWORK] = "network",
  68        [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_MISC] = "misc",
  69};
  70
  71/* String table for conditions. */
  72const char * const tomoyo_condition_keyword[TOMOYO_MAX_CONDITION_KEYWORD] = {
  73        [TOMOYO_TASK_UID]             = "task.uid",
  74        [TOMOYO_TASK_EUID]            = "task.euid",
  75        [TOMOYO_TASK_SUID]            = "task.suid",
  76        [TOMOYO_TASK_FSUID]           = "task.fsuid",
  77        [TOMOYO_TASK_GID]             = "task.gid",
  78        [TOMOYO_TASK_EGID]            = "task.egid",
  79        [TOMOYO_TASK_SGID]            = "task.sgid",
  80        [TOMOYO_TASK_FSGID]           = "task.fsgid",
  81        [TOMOYO_TASK_PID]             = "task.pid",
  82        [TOMOYO_TASK_PPID]            = "task.ppid",
  83        [TOMOYO_EXEC_ARGC]            = "exec.argc",
  84        [TOMOYO_EXEC_ENVC]            = "exec.envc",
  85        [TOMOYO_TYPE_IS_SOCKET]       = "socket",
  86        [TOMOYO_TYPE_IS_SYMLINK]      = "symlink",
  87        [TOMOYO_TYPE_IS_FILE]         = "file",
  88        [TOMOYO_TYPE_IS_BLOCK_DEV]    = "block",
  89        [TOMOYO_TYPE_IS_DIRECTORY]    = "directory",
  90        [TOMOYO_TYPE_IS_CHAR_DEV]     = "char",
  91        [TOMOYO_TYPE_IS_FIFO]         = "fifo",
  92        [TOMOYO_MODE_SETUID]          = "setuid",
  93        [TOMOYO_MODE_SETGID]          = "setgid",
  94        [TOMOYO_MODE_STICKY]          = "sticky",
  95        [TOMOYO_MODE_OWNER_READ]      = "owner_read",
  96        [TOMOYO_MODE_OWNER_WRITE]     = "owner_write",
  97        [TOMOYO_MODE_OWNER_EXECUTE]   = "owner_execute",
  98        [TOMOYO_MODE_GROUP_READ]      = "group_read",
  99        [TOMOYO_MODE_GROUP_WRITE]     = "group_write",
 100        [TOMOYO_MODE_GROUP_EXECUTE]   = "group_execute",
 101        [TOMOYO_MODE_OTHERS_READ]     = "others_read",
 102        [TOMOYO_MODE_OTHERS_WRITE]    = "others_write",
 103        [TOMOYO_MODE_OTHERS_EXECUTE]  = "others_execute",
 104        [TOMOYO_EXEC_REALPATH]        = "exec.realpath",
 105        [TOMOYO_SYMLINK_TARGET]       = "symlink.target",
 106        [TOMOYO_PATH1_UID]            = "path1.uid",
 107        [TOMOYO_PATH1_GID]            = "path1.gid",
 108        [TOMOYO_PATH1_INO]            = "path1.ino",
 109        [TOMOYO_PATH1_MAJOR]          = "path1.major",
 110        [TOMOYO_PATH1_MINOR]          = "path1.minor",
 111        [TOMOYO_PATH1_PERM]           = "path1.perm",
 112        [TOMOYO_PATH1_TYPE]           = "path1.type",
 113        [TOMOYO_PATH1_DEV_MAJOR]      = "path1.dev_major",
 114        [TOMOYO_PATH1_DEV_MINOR]      = "path1.dev_minor",
 115        [TOMOYO_PATH2_UID]            = "path2.uid",
 116        [TOMOYO_PATH2_GID]            = "path2.gid",
 117        [TOMOYO_PATH2_INO]            = "path2.ino",
 118        [TOMOYO_PATH2_MAJOR]          = "path2.major",
 119        [TOMOYO_PATH2_MINOR]          = "path2.minor",
 120        [TOMOYO_PATH2_PERM]           = "path2.perm",
 121        [TOMOYO_PATH2_TYPE]           = "path2.type",
 122        [TOMOYO_PATH2_DEV_MAJOR]      = "path2.dev_major",
 123        [TOMOYO_PATH2_DEV_MINOR]      = "path2.dev_minor",
 124        [TOMOYO_PATH1_PARENT_UID]     = "path1.parent.uid",
 125        [TOMOYO_PATH1_PARENT_GID]     = "path1.parent.gid",
 126        [TOMOYO_PATH1_PARENT_INO]     = "path1.parent.ino",
 127        [TOMOYO_PATH1_PARENT_PERM]    = "path1.parent.perm",
 128        [TOMOYO_PATH2_PARENT_UID]     = "path2.parent.uid",
 129        [TOMOYO_PATH2_PARENT_GID]     = "path2.parent.gid",
 130        [TOMOYO_PATH2_PARENT_INO]     = "path2.parent.ino",
 131        [TOMOYO_PATH2_PARENT_PERM]    = "path2.parent.perm",
 132};
 133
 134/* String table for PREFERENCE keyword. */
 135static const char * const tomoyo_pref_keywords[TOMOYO_MAX_PREF] = {
 136        [TOMOYO_PREF_MAX_AUDIT_LOG]      = "max_audit_log",
 137        [TOMOYO_PREF_MAX_LEARNING_ENTRY] = "max_learning_entry",
 138};
 139
 140/* String table for path operation. */
 141const char * const tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = {
 142        [TOMOYO_TYPE_EXECUTE]    = "execute",
 143        [TOMOYO_TYPE_READ]       = "read",
 144        [TOMOYO_TYPE_WRITE]      = "write",
 145        [TOMOYO_TYPE_APPEND]     = "append",
 146        [TOMOYO_TYPE_UNLINK]     = "unlink",
 147        [TOMOYO_TYPE_GETATTR]    = "getattr",
 148        [TOMOYO_TYPE_RMDIR]      = "rmdir",
 149        [TOMOYO_TYPE_TRUNCATE]   = "truncate",
 150        [TOMOYO_TYPE_SYMLINK]    = "symlink",
 151        [TOMOYO_TYPE_CHROOT]     = "chroot",
 152        [TOMOYO_TYPE_UMOUNT]     = "unmount",
 153};
 154
 155/* String table for socket's operation. */
 156const char * const tomoyo_socket_keyword[TOMOYO_MAX_NETWORK_OPERATION] = {
 157        [TOMOYO_NETWORK_BIND]    = "bind",
 158        [TOMOYO_NETWORK_LISTEN]  = "listen",
 159        [TOMOYO_NETWORK_CONNECT] = "connect",
 160        [TOMOYO_NETWORK_SEND]    = "send",
 161};
 162
 163/* String table for categories. */
 164static const char * const tomoyo_category_keywords
 165[TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
 166        [TOMOYO_MAC_CATEGORY_FILE]    = "file",
 167        [TOMOYO_MAC_CATEGORY_NETWORK] = "network",
 168        [TOMOYO_MAC_CATEGORY_MISC]    = "misc",
 169};
 170
 171/* Permit policy management by non-root user? */
 172static bool tomoyo_manage_by_non_root;
 173
 174/* Utility functions. */
 175
 176/**
 177 * tomoyo_yesno - Return "yes" or "no".
 178 *
 179 * @value: Bool value.
 180 */
 181const char *tomoyo_yesno(const unsigned int value)
 182{
 183        return value ? "yes" : "no";
 184}
 185
 186/**
 187 * tomoyo_addprintf - strncat()-like-snprintf().
 188 *
 189 * @buffer: Buffer to write to. Must be '\0'-terminated.
 190 * @len:    Size of @buffer.
 191 * @fmt:    The printf()'s format string, followed by parameters.
 192 *
 193 * Returns nothing.
 194 */
 195static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...)
 196{
 197        va_list args;
 198        const int pos = strlen(buffer);
 199        va_start(args, fmt);
 200        vsnprintf(buffer + pos, len - pos - 1, fmt, args);
 201        va_end(args);
 202}
 203
 204/**
 205 * tomoyo_flush - Flush queued string to userspace's buffer.
 206 *
 207 * @head:   Pointer to "struct tomoyo_io_buffer".
 208 *
 209 * Returns true if all data was flushed, false otherwise.
 210 */
 211static bool tomoyo_flush(struct tomoyo_io_buffer *head)
 212{
 213        while (head->r.w_pos) {
 214                const char *w = head->r.w[0];
 215                size_t len = strlen(w);
 216                if (len) {
 217                        if (len > head->read_user_buf_avail)
 218                                len = head->read_user_buf_avail;
 219                        if (!len)
 220                                return false;
 221                        if (copy_to_user(head->read_user_buf, w, len))
 222                                return false;
 223                        head->read_user_buf_avail -= len;
 224                        head->read_user_buf += len;
 225                        w += len;
 226                }
 227                head->r.w[0] = w;
 228                if (*w)
 229                        return false;
 230                /* Add '\0' for audit logs and query. */
 231                if (head->poll) {
 232                        if (!head->read_user_buf_avail ||
 233                            copy_to_user(head->read_user_buf, "", 1))
 234                                return false;
 235                        head->read_user_buf_avail--;
 236                        head->read_user_buf++;
 237                }
 238                head->r.w_pos--;
 239                for (len = 0; len < head->r.w_pos; len++)
 240                        head->r.w[len] = head->r.w[len + 1];
 241        }
 242        head->r.avail = 0;
 243        return true;
 244}
 245
 246/**
 247 * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
 248 *
 249 * @head:   Pointer to "struct tomoyo_io_buffer".
 250 * @string: String to print.
 251 *
 252 * Note that @string has to be kept valid until @head is kfree()d.
 253 * This means that char[] allocated on stack memory cannot be passed to
 254 * this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
 255 */
 256static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string)
 257{
 258        if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) {
 259                head->r.w[head->r.w_pos++] = string;
 260                tomoyo_flush(head);
 261        } else
 262                WARN_ON(1);
 263}
 264
 265static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
 266                             ...) __printf(2, 3);
 267
 268/**
 269 * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
 270 *
 271 * @head: Pointer to "struct tomoyo_io_buffer".
 272 * @fmt:  The printf()'s format string, followed by parameters.
 273 */
 274static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
 275                             ...)
 276{
 277        va_list args;
 278        size_t len;
 279        size_t pos = head->r.avail;
 280        int size = head->readbuf_size - pos;
 281        if (size <= 0)
 282                return;
 283        va_start(args, fmt);
 284        len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
 285        va_end(args);
 286        if (pos + len >= head->readbuf_size) {
 287                WARN_ON(1);
 288                return;
 289        }
 290        head->r.avail += len;
 291        tomoyo_set_string(head, head->read_buf + pos);
 292}
 293
 294/**
 295 * tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure.
 296 *
 297 * @head: Pointer to "struct tomoyo_io_buffer".
 298 *
 299 * Returns nothing.
 300 */
 301static void tomoyo_set_space(struct tomoyo_io_buffer *head)
 302{
 303        tomoyo_set_string(head, " ");
 304}
 305
 306/**
 307 * tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure.
 308 *
 309 * @head: Pointer to "struct tomoyo_io_buffer".
 310 *
 311 * Returns nothing.
 312 */
 313static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
 314{
 315        tomoyo_set_string(head, "\n");
 316        return !head->r.w_pos;
 317}
 318
 319/**
 320 * tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure.
 321 *
 322 * @head: Pointer to "struct tomoyo_io_buffer".
 323 *
 324 * Returns nothing.
 325 */
 326static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
 327{
 328        tomoyo_set_string(head, "/");
 329}
 330
 331/* List of namespaces. */
 332LIST_HEAD(tomoyo_namespace_list);
 333/* True if namespace other than tomoyo_kernel_namespace is defined. */
 334static bool tomoyo_namespace_enabled;
 335
 336/**
 337 * tomoyo_init_policy_namespace - Initialize namespace.
 338 *
 339 * @ns: Pointer to "struct tomoyo_policy_namespace".
 340 *
 341 * Returns nothing.
 342 */
 343void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns)
 344{
 345        unsigned int idx;
 346        for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++)
 347                INIT_LIST_HEAD(&ns->acl_group[idx]);
 348        for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++)
 349                INIT_LIST_HEAD(&ns->group_list[idx]);
 350        for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++)
 351                INIT_LIST_HEAD(&ns->policy_list[idx]);
 352        ns->profile_version = 20110903;
 353        tomoyo_namespace_enabled = !list_empty(&tomoyo_namespace_list);
 354        list_add_tail_rcu(&ns->namespace_list, &tomoyo_namespace_list);
 355}
 356
 357/**
 358 * tomoyo_print_namespace - Print namespace header.
 359 *
 360 * @head: Pointer to "struct tomoyo_io_buffer".
 361 *
 362 * Returns nothing.
 363 */
 364static void tomoyo_print_namespace(struct tomoyo_io_buffer *head)
 365{
 366        if (!tomoyo_namespace_enabled)
 367                return;
 368        tomoyo_set_string(head,
 369                          container_of(head->r.ns,
 370                                       struct tomoyo_policy_namespace,
 371                                       namespace_list)->name);
 372        tomoyo_set_space(head);
 373}
 374
 375/**
 376 * tomoyo_print_name_union - Print a tomoyo_name_union.
 377 *
 378 * @head: Pointer to "struct tomoyo_io_buffer".
 379 * @ptr:  Pointer to "struct tomoyo_name_union".
 380 */
 381static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
 382                                    const struct tomoyo_name_union *ptr)
 383{
 384        tomoyo_set_space(head);
 385        if (ptr->group) {
 386                tomoyo_set_string(head, "@");
 387                tomoyo_set_string(head, ptr->group->group_name->name);
 388        } else {
 389                tomoyo_set_string(head, ptr->filename->name);
 390        }
 391}
 392
 393/**
 394 * tomoyo_print_name_union_quoted - Print a tomoyo_name_union with a quote.
 395 *
 396 * @head: Pointer to "struct tomoyo_io_buffer".
 397 * @ptr:  Pointer to "struct tomoyo_name_union".
 398 *
 399 * Returns nothing.
 400 */
 401static void tomoyo_print_name_union_quoted(struct tomoyo_io_buffer *head,
 402                                           const struct tomoyo_name_union *ptr)
 403{
 404        if (ptr->group) {
 405                tomoyo_set_string(head, "@");
 406                tomoyo_set_string(head, ptr->group->group_name->name);
 407        } else {
 408                tomoyo_set_string(head, "\"");
 409                tomoyo_set_string(head, ptr->filename->name);
 410                tomoyo_set_string(head, "\"");
 411        }
 412}
 413
 414/**
 415 * tomoyo_print_number_union_nospace - Print a tomoyo_number_union without a space.
 416 *
 417 * @head: Pointer to "struct tomoyo_io_buffer".
 418 * @ptr:  Pointer to "struct tomoyo_number_union".
 419 *
 420 * Returns nothing.
 421 */
 422static void tomoyo_print_number_union_nospace
 423(struct tomoyo_io_buffer *head, const struct tomoyo_number_union *ptr)
 424{
 425        if (ptr->group) {
 426                tomoyo_set_string(head, "@");
 427                tomoyo_set_string(head, ptr->group->group_name->name);
 428        } else {
 429                int i;
 430                unsigned long min = ptr->values[0];
 431                const unsigned long max = ptr->values[1];
 432                u8 min_type = ptr->value_type[0];
 433                const u8 max_type = ptr->value_type[1];
 434                char buffer[128];
 435                buffer[0] = '\0';
 436                for (i = 0; i < 2; i++) {
 437                        switch (min_type) {
 438                        case TOMOYO_VALUE_TYPE_HEXADECIMAL:
 439                                tomoyo_addprintf(buffer, sizeof(buffer),
 440                                                 "0x%lX", min);
 441                                break;
 442                        case TOMOYO_VALUE_TYPE_OCTAL:
 443                                tomoyo_addprintf(buffer, sizeof(buffer),
 444                                                 "0%lo", min);
 445                                break;
 446                        default:
 447                                tomoyo_addprintf(buffer, sizeof(buffer), "%lu",
 448                                                 min);
 449                                break;
 450                        }
 451                        if (min == max && min_type == max_type)
 452                                break;
 453                        tomoyo_addprintf(buffer, sizeof(buffer), "-");
 454                        min_type = max_type;
 455                        min = max;
 456                }
 457                tomoyo_io_printf(head, "%s", buffer);
 458        }
 459}
 460
 461/**
 462 * tomoyo_print_number_union - Print a tomoyo_number_union.
 463 *
 464 * @head: Pointer to "struct tomoyo_io_buffer".
 465 * @ptr:  Pointer to "struct tomoyo_number_union".
 466 *
 467 * Returns nothing.
 468 */
 469static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
 470                                      const struct tomoyo_number_union *ptr)
 471{
 472        tomoyo_set_space(head);
 473        tomoyo_print_number_union_nospace(head, ptr);
 474}
 475
 476/**
 477 * tomoyo_assign_profile - Create a new profile.
 478 *
 479 * @ns:      Pointer to "struct tomoyo_policy_namespace".
 480 * @profile: Profile number to create.
 481 *
 482 * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
 483 */
 484static struct tomoyo_profile *tomoyo_assign_profile
 485(struct tomoyo_policy_namespace *ns, const unsigned int profile)
 486{
 487        struct tomoyo_profile *ptr;
 488        struct tomoyo_profile *entry;
 489        if (profile >= TOMOYO_MAX_PROFILES)
 490                return NULL;
 491        ptr = ns->profile_ptr[profile];
 492        if (ptr)
 493                return ptr;
 494        entry = kzalloc(sizeof(*entry), GFP_NOFS);
 495        if (mutex_lock_interruptible(&tomoyo_policy_lock))
 496                goto out;
 497        ptr = ns->profile_ptr[profile];
 498        if (!ptr && tomoyo_memory_ok(entry)) {
 499                ptr = entry;
 500                ptr->default_config = TOMOYO_CONFIG_DISABLED |
 501                        TOMOYO_CONFIG_WANT_GRANT_LOG |
 502                        TOMOYO_CONFIG_WANT_REJECT_LOG;
 503                memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
 504                       sizeof(ptr->config));
 505                ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] =
 506                        CONFIG_SECURITY_TOMOYO_MAX_AUDIT_LOG;
 507                ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] =
 508                        CONFIG_SECURITY_TOMOYO_MAX_ACCEPT_ENTRY;
 509                mb(); /* Avoid out-of-order execution. */
 510                ns->profile_ptr[profile] = ptr;
 511                entry = NULL;
 512        }
 513        mutex_unlock(&tomoyo_policy_lock);
 514 out:
 515        kfree(entry);
 516        return ptr;
 517}
 518
 519/**
 520 * tomoyo_profile - Find a profile.
 521 *
 522 * @ns:      Pointer to "struct tomoyo_policy_namespace".
 523 * @profile: Profile number to find.
 524 *
 525 * Returns pointer to "struct tomoyo_profile".
 526 */
 527struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns,
 528                                      const u8 profile)
 529{
 530        static struct tomoyo_profile tomoyo_null_profile;
 531        struct tomoyo_profile *ptr = ns->profile_ptr[profile];
 532        if (!ptr)
 533                ptr = &tomoyo_null_profile;
 534        return ptr;
 535}
 536
 537/**
 538 * tomoyo_find_yesno - Find values for specified keyword.
 539 *
 540 * @string: String to check.
 541 * @find:   Name of keyword.
 542 *
 543 * Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise.
 544 */
 545static s8 tomoyo_find_yesno(const char *string, const char *find)
 546{
 547        const char *cp = strstr(string, find);
 548        if (cp) {
 549                cp += strlen(find);
 550                if (!strncmp(cp, "=yes", 4))
 551                        return 1;
 552                else if (!strncmp(cp, "=no", 3))
 553                        return 0;
 554        }
 555        return -1;
 556}
 557
 558/**
 559 * tomoyo_set_uint - Set value for specified preference.
 560 *
 561 * @i:      Pointer to "unsigned int".
 562 * @string: String to check.
 563 * @find:   Name of keyword.
 564 *
 565 * Returns nothing.
 566 */
 567static void tomoyo_set_uint(unsigned int *i, const char *string,
 568                            const char *find)
 569{
 570        const char *cp = strstr(string, find);
 571        if (cp)
 572                sscanf(cp + strlen(find), "=%u", i);
 573}
 574
 575/**
 576 * tomoyo_set_mode - Set mode for specified profile.
 577 *
 578 * @name:    Name of functionality.
 579 * @value:   Mode for @name.
 580 * @profile: Pointer to "struct tomoyo_profile".
 581 *
 582 * Returns 0 on success, negative value otherwise.
 583 */
 584static int tomoyo_set_mode(char *name, const char *value,
 585                           struct tomoyo_profile *profile)
 586{
 587        u8 i;
 588        u8 config;
 589        if (!strcmp(name, "CONFIG")) {
 590                i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
 591                config = profile->default_config;
 592        } else if (tomoyo_str_starts(&name, "CONFIG::")) {
 593                config = 0;
 594                for (i = 0; i < TOMOYO_MAX_MAC_INDEX
 595                             + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
 596                        int len = 0;
 597                        if (i < TOMOYO_MAX_MAC_INDEX) {
 598                                const u8 c = tomoyo_index2category[i];
 599                                const char *category =
 600                                        tomoyo_category_keywords[c];
 601                                len = strlen(category);
 602                                if (strncmp(name, category, len) ||
 603                                    name[len++] != ':' || name[len++] != ':')
 604                                        continue;
 605                        }
 606                        if (strcmp(name + len, tomoyo_mac_keywords[i]))
 607                                continue;
 608                        config = profile->config[i];
 609                        break;
 610                }
 611                if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
 612                        return -EINVAL;
 613        } else {
 614                return -EINVAL;
 615        }
 616        if (strstr(value, "use_default")) {
 617                config = TOMOYO_CONFIG_USE_DEFAULT;
 618        } else {
 619                u8 mode;
 620                for (mode = 0; mode < 4; mode++)
 621                        if (strstr(value, tomoyo_mode[mode]))
 622                                /*
 623                                 * Update lower 3 bits in order to distinguish
 624                                 * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
 625                                 */
 626                                config = (config & ~7) | mode;
 627                if (config != TOMOYO_CONFIG_USE_DEFAULT) {
 628                        switch (tomoyo_find_yesno(value, "grant_log")) {
 629                        case 1:
 630                                config |= TOMOYO_CONFIG_WANT_GRANT_LOG;
 631                                break;
 632                        case 0:
 633                                config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG;
 634                                break;
 635                        }
 636                        switch (tomoyo_find_yesno(value, "reject_log")) {
 637                        case 1:
 638                                config |= TOMOYO_CONFIG_WANT_REJECT_LOG;
 639                                break;
 640                        case 0:
 641                                config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG;
 642                                break;
 643                        }
 644                }
 645        }
 646        if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
 647                profile->config[i] = config;
 648        else if (config != TOMOYO_CONFIG_USE_DEFAULT)
 649                profile->default_config = config;
 650        return 0;
 651}
 652
 653/**
 654 * tomoyo_write_profile - Write profile table.
 655 *
 656 * @head: Pointer to "struct tomoyo_io_buffer".
 657 *
 658 * Returns 0 on success, negative value otherwise.
 659 */
 660static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
 661{
 662        char *data = head->write_buf;
 663        unsigned int i;
 664        char *cp;
 665        struct tomoyo_profile *profile;
 666        if (sscanf(data, "PROFILE_VERSION=%u", &head->w.ns->profile_version)
 667            == 1)
 668                return 0;
 669        i = simple_strtoul(data, &cp, 10);
 670        if (*cp != '-')
 671                return -EINVAL;
 672        data = cp + 1;
 673        profile = tomoyo_assign_profile(head->w.ns, i);
 674        if (!profile)
 675                return -EINVAL;
 676        cp = strchr(data, '=');
 677        if (!cp)
 678                return -EINVAL;
 679        *cp++ = '\0';
 680        if (!strcmp(data, "COMMENT")) {
 681                static DEFINE_SPINLOCK(lock);
 682                const struct tomoyo_path_info *new_comment
 683                        = tomoyo_get_name(cp);
 684                const struct tomoyo_path_info *old_comment;
 685                if (!new_comment)
 686                        return -ENOMEM;
 687                spin_lock(&lock);
 688                old_comment = profile->comment;
 689                profile->comment = new_comment;
 690                spin_unlock(&lock);
 691                tomoyo_put_name(old_comment);
 692                return 0;
 693        }
 694        if (!strcmp(data, "PREFERENCE")) {
 695                for (i = 0; i < TOMOYO_MAX_PREF; i++)
 696                        tomoyo_set_uint(&profile->pref[i], cp,
 697                                        tomoyo_pref_keywords[i]);
 698                return 0;
 699        }
 700        return tomoyo_set_mode(data, cp, profile);
 701}
 702
 703/**
 704 * tomoyo_print_config - Print mode for specified functionality.
 705 *
 706 * @head:   Pointer to "struct tomoyo_io_buffer".
 707 * @config: Mode for that functionality.
 708 *
 709 * Returns nothing.
 710 *
 711 * Caller prints functionality's name.
 712 */
 713static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
 714{
 715        tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n",
 716                         tomoyo_mode[config & 3],
 717                         tomoyo_yesno(config & TOMOYO_CONFIG_WANT_GRANT_LOG),
 718                         tomoyo_yesno(config & TOMOYO_CONFIG_WANT_REJECT_LOG));
 719}
 720
 721/**
 722 * tomoyo_read_profile - Read profile table.
 723 *
 724 * @head: Pointer to "struct tomoyo_io_buffer".
 725 *
 726 * Returns nothing.
 727 */
 728static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
 729{
 730        u8 index;
 731        struct tomoyo_policy_namespace *ns =
 732                container_of(head->r.ns, typeof(*ns), namespace_list);
 733        const struct tomoyo_profile *profile;
 734        if (head->r.eof)
 735                return;
 736 next:
 737        index = head->r.index;
 738        profile = ns->profile_ptr[index];
 739        switch (head->r.step) {
 740        case 0:
 741                tomoyo_print_namespace(head);
 742                tomoyo_io_printf(head, "PROFILE_VERSION=%u\n",
 743                                 ns->profile_version);
 744                head->r.step++;
 745                break;
 746        case 1:
 747                for ( ; head->r.index < TOMOYO_MAX_PROFILES;
 748                      head->r.index++)
 749                        if (ns->profile_ptr[head->r.index])
 750                                break;
 751                if (head->r.index == TOMOYO_MAX_PROFILES) {
 752                        head->r.eof = true;
 753                        return;
 754                }
 755                head->r.step++;
 756                break;
 757        case 2:
 758                {
 759                        u8 i;
 760                        const struct tomoyo_path_info *comment =
 761                                profile->comment;
 762                        tomoyo_print_namespace(head);
 763                        tomoyo_io_printf(head, "%u-COMMENT=", index);
 764                        tomoyo_set_string(head, comment ? comment->name : "");
 765                        tomoyo_set_lf(head);
 766                        tomoyo_print_namespace(head);
 767                        tomoyo_io_printf(head, "%u-PREFERENCE={ ", index);
 768                        for (i = 0; i < TOMOYO_MAX_PREF; i++)
 769                                tomoyo_io_printf(head, "%s=%u ",
 770                                                 tomoyo_pref_keywords[i],
 771                                                 profile->pref[i]);
 772                        tomoyo_set_string(head, "}\n");
 773                        head->r.step++;
 774                }
 775                break;
 776        case 3:
 777                {
 778                        tomoyo_print_namespace(head);
 779                        tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
 780                        tomoyo_print_config(head, profile->default_config);
 781                        head->r.bit = 0;
 782                        head->r.step++;
 783                }
 784                break;
 785        case 4:
 786                for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
 787                              + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
 788                        const u8 i = head->r.bit;
 789                        const u8 config = profile->config[i];
 790                        if (config == TOMOYO_CONFIG_USE_DEFAULT)
 791                                continue;
 792                        tomoyo_print_namespace(head);
 793                        if (i < TOMOYO_MAX_MAC_INDEX)
 794                                tomoyo_io_printf(head, "%u-CONFIG::%s::%s",
 795                                                 index,
 796                                                 tomoyo_category_keywords
 797                                                 [tomoyo_index2category[i]],
 798                                                 tomoyo_mac_keywords[i]);
 799                        else
 800                                tomoyo_io_printf(head, "%u-CONFIG::%s", index,
 801                                                 tomoyo_mac_keywords[i]);
 802                        tomoyo_print_config(head, config);
 803                        head->r.bit++;
 804                        break;
 805                }
 806                if (head->r.bit == TOMOYO_MAX_MAC_INDEX
 807                    + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
 808                        head->r.index++;
 809                        head->r.step = 1;
 810                }
 811                break;
 812        }
 813        if (tomoyo_flush(head))
 814                goto next;
 815}
 816
 817/**
 818 * tomoyo_same_manager - Check for duplicated "struct tomoyo_manager" entry.
 819 *
 820 * @a: Pointer to "struct tomoyo_acl_head".
 821 * @b: Pointer to "struct tomoyo_acl_head".
 822 *
 823 * Returns true if @a == @b, false otherwise.
 824 */
 825static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
 826                                const struct tomoyo_acl_head *b)
 827{
 828        return container_of(a, struct tomoyo_manager, head)->manager ==
 829                container_of(b, struct tomoyo_manager, head)->manager;
 830}
 831
 832/**
 833 * tomoyo_update_manager_entry - Add a manager entry.
 834 *
 835 * @manager:   The path to manager or the domainnamme.
 836 * @is_delete: True if it is a delete request.
 837 *
 838 * Returns 0 on success, negative value otherwise.
 839 *
 840 * Caller holds tomoyo_read_lock().
 841 */
 842static int tomoyo_update_manager_entry(const char *manager,
 843                                       const bool is_delete)
 844{
 845        struct tomoyo_manager e = { };
 846        struct tomoyo_acl_param param = {
 847                /* .ns = &tomoyo_kernel_namespace, */
 848                .is_delete = is_delete,
 849                .list = &tomoyo_kernel_namespace.
 850                policy_list[TOMOYO_ID_MANAGER],
 851        };
 852        int error = is_delete ? -ENOENT : -ENOMEM;
 853        if (!tomoyo_correct_domain(manager) &&
 854            !tomoyo_correct_word(manager))
 855                return -EINVAL;
 856        e.manager = tomoyo_get_name(manager);
 857        if (e.manager) {
 858                error = tomoyo_update_policy(&e.head, sizeof(e), &param,
 859                                             tomoyo_same_manager);
 860                tomoyo_put_name(e.manager);
 861        }
 862        return error;
 863}
 864
 865/**
 866 * tomoyo_write_manager - Write manager policy.
 867 *
 868 * @head: Pointer to "struct tomoyo_io_buffer".
 869 *
 870 * Returns 0 on success, negative value otherwise.
 871 *
 872 * Caller holds tomoyo_read_lock().
 873 */
 874static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
 875{
 876        char *data = head->write_buf;
 877
 878        if (!strcmp(data, "manage_by_non_root")) {
 879                tomoyo_manage_by_non_root = !head->w.is_delete;
 880                return 0;
 881        }
 882        return tomoyo_update_manager_entry(data, head->w.is_delete);
 883}
 884
 885/**
 886 * tomoyo_read_manager - Read manager policy.
 887 *
 888 * @head: Pointer to "struct tomoyo_io_buffer".
 889 *
 890 * Caller holds tomoyo_read_lock().
 891 */
 892static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
 893{
 894        if (head->r.eof)
 895                return;
 896        list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.
 897                             policy_list[TOMOYO_ID_MANAGER]) {
 898                struct tomoyo_manager *ptr =
 899                        list_entry(head->r.acl, typeof(*ptr), head.list);
 900                if (ptr->head.is_deleted)
 901                        continue;
 902                if (!tomoyo_flush(head))
 903                        return;
 904                tomoyo_set_string(head, ptr->manager->name);
 905                tomoyo_set_lf(head);
 906        }
 907        head->r.eof = true;
 908}
 909
 910/**
 911 * tomoyo_manager - Check whether the current process is a policy manager.
 912 *
 913 * Returns true if the current process is permitted to modify policy
 914 * via /sys/kernel/security/tomoyo/ interface.
 915 *
 916 * Caller holds tomoyo_read_lock().
 917 */
 918static bool tomoyo_manager(void)
 919{
 920        struct tomoyo_manager *ptr;
 921        const char *exe;
 922        const struct task_struct *task = current;
 923        const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
 924        bool found = false;
 925
 926        if (!tomoyo_policy_loaded)
 927                return true;
 928        if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
 929                return false;
 930        exe = tomoyo_get_exe();
 931        if (!exe)
 932                return false;
 933        list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
 934                                policy_list[TOMOYO_ID_MANAGER], head.list) {
 935                if (!ptr->head.is_deleted &&
 936                    (!tomoyo_pathcmp(domainname, ptr->manager) ||
 937                     !strcmp(exe, ptr->manager->name))) {
 938                        found = true;
 939                        break;
 940                }
 941        }
 942        if (!found) { /* Reduce error messages. */
 943                static pid_t last_pid;
 944                const pid_t pid = current->pid;
 945                if (last_pid != pid) {
 946                        printk(KERN_WARNING "%s ( %s ) is not permitted to "
 947                               "update policies.\n", domainname->name, exe);
 948                        last_pid = pid;
 949                }
 950        }
 951        kfree(exe);
 952        return found;
 953}
 954
 955static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
 956(unsigned int serial);
 957
 958/**
 959 * tomoyo_select_domain - Parse select command.
 960 *
 961 * @head: Pointer to "struct tomoyo_io_buffer".
 962 * @data: String to parse.
 963 *
 964 * Returns true on success, false otherwise.
 965 *
 966 * Caller holds tomoyo_read_lock().
 967 */
 968static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
 969                                 const char *data)
 970{
 971        unsigned int pid;
 972        struct tomoyo_domain_info *domain = NULL;
 973        bool global_pid = false;
 974        if (strncmp(data, "select ", 7))
 975                return false;
 976        data += 7;
 977        if (sscanf(data, "pid=%u", &pid) == 1 ||
 978            (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
 979                struct task_struct *p;
 980                rcu_read_lock();
 981                if (global_pid)
 982                        p = find_task_by_pid_ns(pid, &init_pid_ns);
 983                else
 984                        p = find_task_by_vpid(pid);
 985                if (p)
 986                        domain = tomoyo_real_domain(p);
 987                rcu_read_unlock();
 988        } else if (!strncmp(data, "domain=", 7)) {
 989                if (tomoyo_domain_def(data + 7))
 990                        domain = tomoyo_find_domain(data + 7);
 991        } else if (sscanf(data, "Q=%u", &pid) == 1) {
 992                domain = tomoyo_find_domain_by_qid(pid);
 993        } else
 994                return false;
 995        head->w.domain = domain;
 996        /* Accessing read_buf is safe because head->io_sem is held. */
 997        if (!head->read_buf)
 998                return true; /* Do nothing if open(O_WRONLY). */
 999        memset(&head->r, 0, sizeof(head->r));
1000        head->r.print_this_domain_only = true;
1001        if (domain)
1002                head->r.domain = &domain->list;
1003        else
1004                head->r.eof = 1;
1005        tomoyo_io_printf(head, "# select %s\n", data);
1006        if (domain && domain->is_deleted)
1007                tomoyo_io_printf(head, "# This is a deleted domain.\n");
1008        return true;
1009}
1010
1011/**
1012 * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry.
1013 *
1014 * @a: Pointer to "struct tomoyo_acl_info".
1015 * @b: Pointer to "struct tomoyo_acl_info".
1016 *
1017 * Returns true if @a == @b, false otherwise.
1018 */
1019static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a,
1020                              const struct tomoyo_acl_info *b)
1021{
1022        const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head);
1023        const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head);
1024        return p1->domainname == p2->domainname;
1025}
1026
1027/**
1028 * tomoyo_write_task - Update task related list.
1029 *
1030 * @param: Pointer to "struct tomoyo_acl_param".
1031 *
1032 * Returns 0 on success, negative value otherwise.
1033 *
1034 * Caller holds tomoyo_read_lock().
1035 */
1036static int tomoyo_write_task(struct tomoyo_acl_param *param)
1037{
1038        int error = -EINVAL;
1039        if (tomoyo_str_starts(&param->data, "manual_domain_transition ")) {
1040                struct tomoyo_task_acl e = {
1041                        .head.type = TOMOYO_TYPE_MANUAL_TASK_ACL,
1042                        .domainname = tomoyo_get_domainname(param),
1043                };
1044                if (e.domainname)
1045                        error = tomoyo_update_domain(&e.head, sizeof(e), param,
1046                                                     tomoyo_same_task_acl,
1047                                                     NULL);
1048                tomoyo_put_name(e.domainname);
1049        }
1050        return error;
1051}
1052
1053/**
1054 * tomoyo_delete_domain - Delete a domain.
1055 *
1056 * @domainname: The name of domain.
1057 *
1058 * Returns 0 on success, negative value otherwise.
1059 *
1060 * Caller holds tomoyo_read_lock().
1061 */
1062static int tomoyo_delete_domain(char *domainname)
1063{
1064        struct tomoyo_domain_info *domain;
1065        struct tomoyo_path_info name;
1066
1067        name.name = domainname;
1068        tomoyo_fill_path_info(&name);
1069        if (mutex_lock_interruptible(&tomoyo_policy_lock))
1070                return -EINTR;
1071        /* Is there an active domain? */
1072        list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1073                /* Never delete tomoyo_kernel_domain */
1074                if (domain == &tomoyo_kernel_domain)
1075                        continue;
1076                if (domain->is_deleted ||
1077                    tomoyo_pathcmp(domain->domainname, &name))
1078                        continue;
1079                domain->is_deleted = true;
1080                break;
1081        }
1082        mutex_unlock(&tomoyo_policy_lock);
1083        return 0;
1084}
1085
1086/**
1087 * tomoyo_write_domain2 - Write domain policy.
1088 *
1089 * @ns:        Pointer to "struct tomoyo_policy_namespace".
1090 * @list:      Pointer to "struct list_head".
1091 * @data:      Policy to be interpreted.
1092 * @is_delete: True if it is a delete request.
1093 *
1094 * Returns 0 on success, negative value otherwise.
1095 *
1096 * Caller holds tomoyo_read_lock().
1097 */
1098static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
1099                                struct list_head *list, char *data,
1100                                const bool is_delete)
1101{
1102        struct tomoyo_acl_param param = {
1103                .ns = ns,
1104                .list = list,
1105                .data = data,
1106                .is_delete = is_delete,
1107        };
1108        static const struct {
1109                const char *keyword;
1110                int (*write) (struct tomoyo_acl_param *);
1111        } tomoyo_callback[5] = {
1112                { "file ", tomoyo_write_file },
1113                { "network inet ", tomoyo_write_inet_network },
1114                { "network unix ", tomoyo_write_unix_network },
1115                { "misc ", tomoyo_write_misc },
1116                { "task ", tomoyo_write_task },
1117        };
1118        u8 i;
1119
1120        for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) {
1121                if (!tomoyo_str_starts(&param.data,
1122                                       tomoyo_callback[i].keyword))
1123                        continue;
1124                return tomoyo_callback[i].write(&param);
1125        }
1126        return -EINVAL;
1127}
1128
1129/* String table for domain flags. */
1130const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1131        [TOMOYO_DIF_QUOTA_WARNED]      = "quota_exceeded\n",
1132        [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1133};
1134
1135/**
1136 * tomoyo_write_domain - Write domain policy.
1137 *
1138 * @head: Pointer to "struct tomoyo_io_buffer".
1139 *
1140 * Returns 0 on success, negative value otherwise.
1141 *
1142 * Caller holds tomoyo_read_lock().
1143 */
1144static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1145{
1146        char *data = head->write_buf;
1147        struct tomoyo_policy_namespace *ns;
1148        struct tomoyo_domain_info *domain = head->w.domain;
1149        const bool is_delete = head->w.is_delete;
1150        bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1151        unsigned int profile;
1152        if (*data == '<') {
1153                int ret = 0;
1154                domain = NULL;
1155                if (is_delete)
1156                        ret = tomoyo_delete_domain(data);
1157                else if (is_select)
1158                        domain = tomoyo_find_domain(data);
1159                else
1160                        domain = tomoyo_assign_domain(data, false);
1161                head->w.domain = domain;
1162                return ret;
1163        }
1164        if (!domain)
1165                return -EINVAL;
1166        ns = domain->ns;
1167        if (sscanf(data, "use_profile %u", &profile) == 1
1168            && profile < TOMOYO_MAX_PROFILES) {
1169                if (!tomoyo_policy_loaded || ns->profile_ptr[profile])
1170                        domain->profile = (u8) profile;
1171                return 0;
1172        }
1173        if (sscanf(data, "use_group %u\n", &profile) == 1
1174            && profile < TOMOYO_MAX_ACL_GROUPS) {
1175                if (!is_delete)
1176                        domain->group = (u8) profile;
1177                return 0;
1178        }
1179        for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) {
1180                const char *cp = tomoyo_dif[profile];
1181                if (strncmp(data, cp, strlen(cp) - 1))
1182                        continue;
1183                domain->flags[profile] = !is_delete;
1184                return 0;
1185        }
1186        return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1187                                    is_delete);
1188}
1189
1190/**
1191 * tomoyo_print_condition - Print condition part.
1192 *
1193 * @head: Pointer to "struct tomoyo_io_buffer".
1194 * @cond: Pointer to "struct tomoyo_condition".
1195 *
1196 * Returns true on success, false otherwise.
1197 */
1198static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1199                                   const struct tomoyo_condition *cond)
1200{
1201        switch (head->r.cond_step) {
1202        case 0:
1203                head->r.cond_index = 0;
1204                head->r.cond_step++;
1205                if (cond->transit) {
1206                        tomoyo_set_space(head);
1207                        tomoyo_set_string(head, cond->transit->name);
1208                }
1209                /* fall through */
1210        case 1:
1211                {
1212                        const u16 condc = cond->condc;
1213                        const struct tomoyo_condition_element *condp =
1214                                (typeof(condp)) (cond + 1);
1215                        const struct tomoyo_number_union *numbers_p =
1216                                (typeof(numbers_p)) (condp + condc);
1217                        const struct tomoyo_name_union *names_p =
1218                                (typeof(names_p))
1219                                (numbers_p + cond->numbers_count);
1220                        const struct tomoyo_argv *argv =
1221                                (typeof(argv)) (names_p + cond->names_count);
1222                        const struct tomoyo_envp *envp =
1223                                (typeof(envp)) (argv + cond->argc);
1224                        u16 skip;
1225                        for (skip = 0; skip < head->r.cond_index; skip++) {
1226                                const u8 left = condp->left;
1227                                const u8 right = condp->right;
1228                                condp++;
1229                                switch (left) {
1230                                case TOMOYO_ARGV_ENTRY:
1231                                        argv++;
1232                                        continue;
1233                                case TOMOYO_ENVP_ENTRY:
1234                                        envp++;
1235                                        continue;
1236                                case TOMOYO_NUMBER_UNION:
1237                                        numbers_p++;
1238                                        break;
1239                                }
1240                                switch (right) {
1241                                case TOMOYO_NAME_UNION:
1242                                        names_p++;
1243                                        break;
1244                                case TOMOYO_NUMBER_UNION:
1245                                        numbers_p++;
1246                                        break;
1247                                }
1248                        }
1249                        while (head->r.cond_index < condc) {
1250                                const u8 match = condp->equals;
1251                                const u8 left = condp->left;
1252                                const u8 right = condp->right;
1253                                if (!tomoyo_flush(head))
1254                                        return false;
1255                                condp++;
1256                                head->r.cond_index++;
1257                                tomoyo_set_space(head);
1258                                switch (left) {
1259                                case TOMOYO_ARGV_ENTRY:
1260                                        tomoyo_io_printf(head,
1261                                                         "exec.argv[%lu]%s=\"",
1262                                                         argv->index, argv->
1263                                                         is_not ? "!" : "");
1264                                        tomoyo_set_string(head,
1265                                                          argv->value->name);
1266                                        tomoyo_set_string(head, "\"");
1267                                        argv++;
1268                                        continue;
1269                                case TOMOYO_ENVP_ENTRY:
1270                                        tomoyo_set_string(head,
1271                                                          "exec.envp[\"");
1272                                        tomoyo_set_string(head,
1273                                                          envp->name->name);
1274                                        tomoyo_io_printf(head, "\"]%s=", envp->
1275                                                         is_not ? "!" : "");
1276                                        if (envp->value) {
1277                                                tomoyo_set_string(head, "\"");
1278                                                tomoyo_set_string(head, envp->
1279                                                                  value->name);
1280                                                tomoyo_set_string(head, "\"");
1281                                        } else {
1282                                                tomoyo_set_string(head,
1283                                                                  "NULL");
1284                                        }
1285                                        envp++;
1286                                        continue;
1287                                case TOMOYO_NUMBER_UNION:
1288                                        tomoyo_print_number_union_nospace
1289                                                (head, numbers_p++);
1290                                        break;
1291                                default:
1292                                        tomoyo_set_string(head,
1293                                               tomoyo_condition_keyword[left]);
1294                                        break;
1295                                }
1296                                tomoyo_set_string(head, match ? "=" : "!=");
1297                                switch (right) {
1298                                case TOMOYO_NAME_UNION:
1299                                        tomoyo_print_name_union_quoted
1300                                                (head, names_p++);
1301                                        break;
1302                                case TOMOYO_NUMBER_UNION:
1303                                        tomoyo_print_number_union_nospace
1304                                                (head, numbers_p++);
1305                                        break;
1306                                default:
1307                                        tomoyo_set_string(head,
1308                                          tomoyo_condition_keyword[right]);
1309                                        break;
1310                                }
1311                        }
1312                }
1313                head->r.cond_step++;
1314                /* fall through */
1315        case 2:
1316                if (!tomoyo_flush(head))
1317                        break;
1318                head->r.cond_step++;
1319                /* fall through */
1320        case 3:
1321                if (cond->grant_log != TOMOYO_GRANTLOG_AUTO)
1322                        tomoyo_io_printf(head, " grant_log=%s",
1323                                         tomoyo_yesno(cond->grant_log ==
1324                                                      TOMOYO_GRANTLOG_YES));
1325                tomoyo_set_lf(head);
1326                return true;
1327        }
1328        return false;
1329}
1330
1331/**
1332 * tomoyo_set_group - Print "acl_group " header keyword and category name.
1333 *
1334 * @head:     Pointer to "struct tomoyo_io_buffer".
1335 * @category: Category name.
1336 *
1337 * Returns nothing.
1338 */
1339static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1340                             const char *category)
1341{
1342        if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1343                tomoyo_print_namespace(head);
1344                tomoyo_io_printf(head, "acl_group %u ",
1345                                 head->r.acl_group_index);
1346        }
1347        tomoyo_set_string(head, category);
1348}
1349
1350/**
1351 * tomoyo_print_entry - Print an ACL entry.
1352 *
1353 * @head: Pointer to "struct tomoyo_io_buffer".
1354 * @acl:  Pointer to an ACL entry.
1355 *
1356 * Returns true on success, false otherwise.
1357 */
1358static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1359                               struct tomoyo_acl_info *acl)
1360{
1361        const u8 acl_type = acl->type;
1362        bool first = true;
1363        u8 bit;
1364
1365        if (head->r.print_cond_part)
1366                goto print_cond_part;
1367        if (acl->is_deleted)
1368                return true;
1369        if (!tomoyo_flush(head))
1370                return false;
1371        else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1372                struct tomoyo_path_acl *ptr =
1373                        container_of(acl, typeof(*ptr), head);
1374                const u16 perm = ptr->perm;
1375                for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1376                        if (!(perm & (1 << bit)))
1377                                continue;
1378                        if (head->r.print_transition_related_only &&
1379                            bit != TOMOYO_TYPE_EXECUTE)
1380                                continue;
1381                        if (first) {
1382                                tomoyo_set_group(head, "file ");
1383                                first = false;
1384                        } else {
1385                                tomoyo_set_slash(head);
1386                        }
1387                        tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1388                }
1389                if (first)
1390                        return true;
1391                tomoyo_print_name_union(head, &ptr->name);
1392        } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) {
1393                struct tomoyo_task_acl *ptr =
1394                        container_of(acl, typeof(*ptr), head);
1395                tomoyo_set_group(head, "task ");
1396                tomoyo_set_string(head, "manual_domain_transition ");
1397                tomoyo_set_string(head, ptr->domainname->name);
1398        } else if (head->r.print_transition_related_only) {
1399                return true;
1400        } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1401                struct tomoyo_path2_acl *ptr =
1402                        container_of(acl, typeof(*ptr), head);
1403                const u8 perm = ptr->perm;
1404                for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1405                        if (!(perm & (1 << bit)))
1406                                continue;
1407                        if (first) {
1408                                tomoyo_set_group(head, "file ");
1409                                first = false;
1410                        } else {
1411                                tomoyo_set_slash(head);
1412                        }
1413                        tomoyo_set_string(head, tomoyo_mac_keywords
1414                                          [tomoyo_pp2mac[bit]]);
1415                }
1416                if (first)
1417                        return true;
1418                tomoyo_print_name_union(head, &ptr->name1);
1419                tomoyo_print_name_union(head, &ptr->name2);
1420        } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1421                struct tomoyo_path_number_acl *ptr =
1422                        container_of(acl, typeof(*ptr), head);
1423                const u8 perm = ptr->perm;
1424                for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1425                        if (!(perm & (1 << bit)))
1426                                continue;
1427                        if (first) {
1428                                tomoyo_set_group(head, "file ");
1429                                first = false;
1430                        } else {
1431                                tomoyo_set_slash(head);
1432                        }
1433                        tomoyo_set_string(head, tomoyo_mac_keywords
1434                                          [tomoyo_pn2mac[bit]]);
1435                }
1436                if (first)
1437                        return true;
1438                tomoyo_print_name_union(head, &ptr->name);
1439                tomoyo_print_number_union(head, &ptr->number);
1440        } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1441                struct tomoyo_mkdev_acl *ptr =
1442                        container_of(acl, typeof(*ptr), head);
1443                const u8 perm = ptr->perm;
1444                for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1445                        if (!(perm & (1 << bit)))
1446                                continue;
1447                        if (first) {
1448                                tomoyo_set_group(head, "file ");
1449                                first = false;
1450                        } else {
1451                                tomoyo_set_slash(head);
1452                        }
1453                        tomoyo_set_string(head, tomoyo_mac_keywords
1454                                          [tomoyo_pnnn2mac[bit]]);
1455                }
1456                if (first)
1457                        return true;
1458                tomoyo_print_name_union(head, &ptr->name);
1459                tomoyo_print_number_union(head, &ptr->mode);
1460                tomoyo_print_number_union(head, &ptr->major);
1461                tomoyo_print_number_union(head, &ptr->minor);
1462        } else if (acl_type == TOMOYO_TYPE_INET_ACL) {
1463                struct tomoyo_inet_acl *ptr =
1464                        container_of(acl, typeof(*ptr), head);
1465                const u8 perm = ptr->perm;
1466
1467                for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1468                        if (!(perm & (1 << bit)))
1469                                continue;
1470                        if (first) {
1471                                tomoyo_set_group(head, "network inet ");
1472                                tomoyo_set_string(head, tomoyo_proto_keyword
1473                                                  [ptr->protocol]);
1474                                tomoyo_set_space(head);
1475                                first = false;
1476                        } else {
1477                                tomoyo_set_slash(head);
1478                        }
1479                        tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1480                }
1481                if (first)
1482                        return true;
1483                tomoyo_set_space(head);
1484                if (ptr->address.group) {
1485                        tomoyo_set_string(head, "@");
1486                        tomoyo_set_string(head, ptr->address.group->group_name
1487                                          ->name);
1488                } else {
1489                        char buf[128];
1490                        tomoyo_print_ip(buf, sizeof(buf), &ptr->address);
1491                        tomoyo_io_printf(head, "%s", buf);
1492                }
1493                tomoyo_print_number_union(head, &ptr->port);
1494        } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) {
1495                struct tomoyo_unix_acl *ptr =
1496                        container_of(acl, typeof(*ptr), head);
1497                const u8 perm = ptr->perm;
1498
1499                for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1500                        if (!(perm & (1 << bit)))
1501                                continue;
1502                        if (first) {
1503                                tomoyo_set_group(head, "network unix ");
1504                                tomoyo_set_string(head, tomoyo_proto_keyword
1505                                                  [ptr->protocol]);
1506                                tomoyo_set_space(head);
1507                                first = false;
1508                        } else {
1509                                tomoyo_set_slash(head);
1510                        }
1511                        tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1512                }
1513                if (first)
1514                        return true;
1515                tomoyo_print_name_union(head, &ptr->name);
1516        } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1517                struct tomoyo_mount_acl *ptr =
1518                        container_of(acl, typeof(*ptr), head);
1519                tomoyo_set_group(head, "file mount");
1520                tomoyo_print_name_union(head, &ptr->dev_name);
1521                tomoyo_print_name_union(head, &ptr->dir_name);
1522                tomoyo_print_name_union(head, &ptr->fs_type);
1523                tomoyo_print_number_union(head, &ptr->flags);
1524        } else if (acl_type == TOMOYO_TYPE_ENV_ACL) {
1525                struct tomoyo_env_acl *ptr =
1526                        container_of(acl, typeof(*ptr), head);
1527
1528                tomoyo_set_group(head, "misc env ");
1529                tomoyo_set_string(head, ptr->env->name);
1530        }
1531        if (acl->cond) {
1532                head->r.print_cond_part = true;
1533                head->r.cond_step = 0;
1534                if (!tomoyo_flush(head))
1535                        return false;
1536print_cond_part:
1537                if (!tomoyo_print_condition(head, acl->cond))
1538                        return false;
1539                head->r.print_cond_part = false;
1540        } else {
1541                tomoyo_set_lf(head);
1542        }
1543        return true;
1544}
1545
1546/**
1547 * tomoyo_read_domain2 - Read domain policy.
1548 *
1549 * @head: Pointer to "struct tomoyo_io_buffer".
1550 * @list: Pointer to "struct list_head".
1551 *
1552 * Caller holds tomoyo_read_lock().
1553 *
1554 * Returns true on success, false otherwise.
1555 */
1556static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1557                                struct list_head *list)
1558{
1559        list_for_each_cookie(head->r.acl, list) {
1560                struct tomoyo_acl_info *ptr =
1561                        list_entry(head->r.acl, typeof(*ptr), list);
1562                if (!tomoyo_print_entry(head, ptr))
1563                        return false;
1564        }
1565        head->r.acl = NULL;
1566        return true;
1567}
1568
1569/**
1570 * tomoyo_read_domain - Read domain policy.
1571 *
1572 * @head: Pointer to "struct tomoyo_io_buffer".
1573 *
1574 * Caller holds tomoyo_read_lock().
1575 */
1576static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1577{
1578        if (head->r.eof)
1579                return;
1580        list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1581                struct tomoyo_domain_info *domain =
1582                        list_entry(head->r.domain, typeof(*domain), list);
1583                switch (head->r.step) {
1584                        u8 i;
1585                case 0:
1586                        if (domain->is_deleted &&
1587                            !head->r.print_this_domain_only)
1588                                continue;
1589                        /* Print domainname and flags. */
1590                        tomoyo_set_string(head, domain->domainname->name);
1591                        tomoyo_set_lf(head);
1592                        tomoyo_io_printf(head, "use_profile %u\n",
1593                                         domain->profile);
1594                        tomoyo_io_printf(head, "use_group %u\n",
1595                                         domain->group);
1596                        for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1597                                if (domain->flags[i])
1598                                        tomoyo_set_string(head, tomoyo_dif[i]);
1599                        head->r.step++;
1600                        tomoyo_set_lf(head);
1601                        /* fall through */
1602                case 1:
1603                        if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1604                                return;
1605                        head->r.step++;
1606                        if (!tomoyo_set_lf(head))
1607                                return;
1608                        /* fall through */
1609                case 2:
1610                        head->r.step = 0;
1611                        if (head->r.print_this_domain_only)
1612                                goto done;
1613                }
1614        }
1615 done:
1616        head->r.eof = true;
1617}
1618
1619/**
1620 * tomoyo_write_pid: Specify PID to obtain domainname.
1621 *
1622 * @head: Pointer to "struct tomoyo_io_buffer".
1623 *
1624 * Returns 0.
1625 */
1626static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1627{
1628        head->r.eof = false;
1629        return 0;
1630}
1631
1632/**
1633 * tomoyo_read_pid - Get domainname of the specified PID.
1634 *
1635 * @head: Pointer to "struct tomoyo_io_buffer".
1636 *
1637 * Returns the domainname which the specified PID is in on success,
1638 * empty string otherwise.
1639 * The PID is specified by tomoyo_write_pid() so that the user can obtain
1640 * using read()/write() interface rather than sysctl() interface.
1641 */
1642static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1643{
1644        char *buf = head->write_buf;
1645        bool global_pid = false;
1646        unsigned int pid;
1647        struct task_struct *p;
1648        struct tomoyo_domain_info *domain = NULL;
1649
1650        /* Accessing write_buf is safe because head->io_sem is held. */
1651        if (!buf) {
1652                head->r.eof = true;
1653                return; /* Do nothing if open(O_RDONLY). */
1654        }
1655        if (head->r.w_pos || head->r.eof)
1656                return;
1657        head->r.eof = true;
1658        if (tomoyo_str_starts(&buf, "global-pid "))
1659                global_pid = true;
1660        pid = (unsigned int) simple_strtoul(buf, NULL, 10);
1661        rcu_read_lock();
1662        if (global_pid)
1663                p = find_task_by_pid_ns(pid, &init_pid_ns);
1664        else
1665                p = find_task_by_vpid(pid);
1666        if (p)
1667                domain = tomoyo_real_domain(p);
1668        rcu_read_unlock();
1669        if (!domain)
1670                return;
1671        tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1672        tomoyo_set_string(head, domain->domainname->name);
1673}
1674
1675/* String table for domain transition control keywords. */
1676static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1677        [TOMOYO_TRANSITION_CONTROL_NO_RESET]      = "no_reset_domain ",
1678        [TOMOYO_TRANSITION_CONTROL_RESET]         = "reset_domain ",
1679        [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1680        [TOMOYO_TRANSITION_CONTROL_INITIALIZE]    = "initialize_domain ",
1681        [TOMOYO_TRANSITION_CONTROL_NO_KEEP]       = "no_keep_domain ",
1682        [TOMOYO_TRANSITION_CONTROL_KEEP]          = "keep_domain ",
1683};
1684
1685/* String table for grouping keywords. */
1686static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1687        [TOMOYO_PATH_GROUP]    = "path_group ",
1688        [TOMOYO_NUMBER_GROUP]  = "number_group ",
1689        [TOMOYO_ADDRESS_GROUP] = "address_group ",
1690};
1691
1692/**
1693 * tomoyo_write_exception - Write exception policy.
1694 *
1695 * @head: Pointer to "struct tomoyo_io_buffer".
1696 *
1697 * Returns 0 on success, negative value otherwise.
1698 *
1699 * Caller holds tomoyo_read_lock().
1700 */
1701static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1702{
1703        const bool is_delete = head->w.is_delete;
1704        struct tomoyo_acl_param param = {
1705                .ns = head->w.ns,
1706                .is_delete = is_delete,
1707                .data = head->write_buf,
1708        };
1709        u8 i;
1710        if (tomoyo_str_starts(&param.data, "aggregator "))
1711                return tomoyo_write_aggregator(&param);
1712        for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1713                if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
1714                        return tomoyo_write_transition_control(&param, i);
1715        for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1716                if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
1717                        return tomoyo_write_group(&param, i);
1718        if (tomoyo_str_starts(&param.data, "acl_group ")) {
1719                unsigned int group;
1720                char *data;
1721                group = simple_strtoul(param.data, &data, 10);
1722                if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1723                        return tomoyo_write_domain2
1724                                (head->w.ns, &head->w.ns->acl_group[group],
1725                                 data, is_delete);
1726        }
1727        return -EINVAL;
1728}
1729
1730/**
1731 * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
1732 *
1733 * @head: Pointer to "struct tomoyo_io_buffer".
1734 * @idx:  Index number.
1735 *
1736 * Returns true on success, false otherwise.
1737 *
1738 * Caller holds tomoyo_read_lock().
1739 */
1740static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1741{
1742        struct tomoyo_policy_namespace *ns =
1743                container_of(head->r.ns, typeof(*ns), namespace_list);
1744        struct list_head *list = &ns->group_list[idx];
1745        list_for_each_cookie(head->r.group, list) {
1746                struct tomoyo_group *group =
1747                        list_entry(head->r.group, typeof(*group), head.list);
1748                list_for_each_cookie(head->r.acl, &group->member_list) {
1749                        struct tomoyo_acl_head *ptr =
1750                                list_entry(head->r.acl, typeof(*ptr), list);
1751                        if (ptr->is_deleted)
1752                                continue;
1753                        if (!tomoyo_flush(head))
1754                                return false;
1755                        tomoyo_print_namespace(head);
1756                        tomoyo_set_string(head, tomoyo_group_name[idx]);
1757                        tomoyo_set_string(head, group->group_name->name);
1758                        if (idx == TOMOYO_PATH_GROUP) {
1759                                tomoyo_set_space(head);
1760                                tomoyo_set_string(head, container_of
1761                                               (ptr, struct tomoyo_path_group,
1762                                                head)->member_name->name);
1763                        } else if (idx == TOMOYO_NUMBER_GROUP) {
1764                                tomoyo_print_number_union(head, &container_of
1765                                                          (ptr,
1766                                                   struct tomoyo_number_group,
1767                                                           head)->number);
1768                        } else if (idx == TOMOYO_ADDRESS_GROUP) {
1769                                char buffer[128];
1770
1771                                struct tomoyo_address_group *member =
1772                                        container_of(ptr, typeof(*member),
1773                                                     head);
1774                                tomoyo_print_ip(buffer, sizeof(buffer),
1775                                                &member->address);
1776                                tomoyo_io_printf(head, " %s", buffer);
1777                        }
1778                        tomoyo_set_lf(head);
1779                }
1780                head->r.acl = NULL;
1781        }
1782        head->r.group = NULL;
1783        return true;
1784}
1785
1786/**
1787 * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1788 *
1789 * @head: Pointer to "struct tomoyo_io_buffer".
1790 * @idx:  Index number.
1791 *
1792 * Returns true on success, false otherwise.
1793 *
1794 * Caller holds tomoyo_read_lock().
1795 */
1796static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1797{
1798        struct tomoyo_policy_namespace *ns =
1799                container_of(head->r.ns, typeof(*ns), namespace_list);
1800        struct list_head *list = &ns->policy_list[idx];
1801        list_for_each_cookie(head->r.acl, list) {
1802                struct tomoyo_acl_head *acl =
1803                        container_of(head->r.acl, typeof(*acl), list);
1804                if (acl->is_deleted)
1805                        continue;
1806                if (!tomoyo_flush(head))
1807                        return false;
1808                switch (idx) {
1809                case TOMOYO_ID_TRANSITION_CONTROL:
1810                        {
1811                                struct tomoyo_transition_control *ptr =
1812                                        container_of(acl, typeof(*ptr), head);
1813                                tomoyo_print_namespace(head);
1814                                tomoyo_set_string(head, tomoyo_transition_type
1815                                                  [ptr->type]);
1816                                tomoyo_set_string(head, ptr->program ?
1817                                                  ptr->program->name : "any");
1818                                tomoyo_set_string(head, " from ");
1819                                tomoyo_set_string(head, ptr->domainname ?
1820                                                  ptr->domainname->name :
1821                                                  "any");
1822                        }
1823                        break;
1824                case TOMOYO_ID_AGGREGATOR:
1825                        {
1826                                struct tomoyo_aggregator *ptr =
1827                                        container_of(acl, typeof(*ptr), head);
1828                                tomoyo_print_namespace(head);
1829                                tomoyo_set_string(head, "aggregator ");
1830                                tomoyo_set_string(head,
1831                                                  ptr->original_name->name);
1832                                tomoyo_set_space(head);
1833                                tomoyo_set_string(head,
1834                                               ptr->aggregated_name->name);
1835                        }
1836                        break;
1837                default:
1838                        continue;
1839                }
1840                tomoyo_set_lf(head);
1841        }
1842        head->r.acl = NULL;
1843        return true;
1844}
1845
1846/**
1847 * tomoyo_read_exception - Read exception policy.
1848 *
1849 * @head: Pointer to "struct tomoyo_io_buffer".
1850 *
1851 * Caller holds tomoyo_read_lock().
1852 */
1853static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1854{
1855        struct tomoyo_policy_namespace *ns =
1856                container_of(head->r.ns, typeof(*ns), namespace_list);
1857        if (head->r.eof)
1858                return;
1859        while (head->r.step < TOMOYO_MAX_POLICY &&
1860               tomoyo_read_policy(head, head->r.step))
1861                head->r.step++;
1862        if (head->r.step < TOMOYO_MAX_POLICY)
1863                return;
1864        while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1865               tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1866                head->r.step++;
1867        if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1868                return;
1869        while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1870               + TOMOYO_MAX_ACL_GROUPS) {
1871                head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1872                        - TOMOYO_MAX_GROUP;
1873                if (!tomoyo_read_domain2(head, &ns->acl_group
1874                                         [head->r.acl_group_index]))
1875                        return;
1876                head->r.step++;
1877        }
1878        head->r.eof = true;
1879}
1880
1881/* Wait queue for kernel -> userspace notification. */
1882static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1883/* Wait queue for userspace -> kernel notification. */
1884static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1885
1886/* Structure for query. */
1887struct tomoyo_query {
1888        struct list_head list;
1889        struct tomoyo_domain_info *domain;
1890        char *query;
1891        size_t query_len;
1892        unsigned int serial;
1893        u8 timer;
1894        u8 answer;
1895        u8 retry;
1896};
1897
1898/* The list for "struct tomoyo_query". */
1899static LIST_HEAD(tomoyo_query_list);
1900
1901/* Lock for manipulating tomoyo_query_list. */
1902static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1903
1904/*
1905 * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1906 * interface.
1907 */
1908static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1909
1910/**
1911 * tomoyo_truncate - Truncate a line.
1912 *
1913 * @str: String to truncate.
1914 *
1915 * Returns length of truncated @str.
1916 */
1917static int tomoyo_truncate(char *str)
1918{
1919        char *start = str;
1920        while (*(unsigned char *) str > (unsigned char) ' ')
1921                str++;
1922        *str = '\0';
1923        return strlen(start) + 1;
1924}
1925
1926/**
1927 * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1928 *
1929 * @domain: Pointer to "struct tomoyo_domain_info".
1930 * @header: Lines containing ACL.
1931 *
1932 * Returns nothing.
1933 */
1934static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
1935{
1936        char *buffer;
1937        char *realpath = NULL;
1938        char *argv0 = NULL;
1939        char *symlink = NULL;
1940        char *cp = strchr(header, '\n');
1941        int len;
1942        if (!cp)
1943                return;
1944        cp = strchr(cp + 1, '\n');
1945        if (!cp)
1946                return;
1947        *cp++ = '\0';
1948        len = strlen(cp) + 1;
1949        /* strstr() will return NULL if ordering is wrong. */
1950        if (*cp == 'f') {
1951                argv0 = strstr(header, " argv[]={ \"");
1952                if (argv0) {
1953                        argv0 += 10;
1954                        len += tomoyo_truncate(argv0) + 14;
1955                }
1956                realpath = strstr(header, " exec={ realpath=\"");
1957                if (realpath) {
1958                        realpath += 8;
1959                        len += tomoyo_truncate(realpath) + 6;
1960                }
1961                symlink = strstr(header, " symlink.target=\"");
1962                if (symlink)
1963                        len += tomoyo_truncate(symlink + 1) + 1;
1964        }
1965        buffer = kmalloc(len, GFP_NOFS);
1966        if (!buffer)
1967                return;
1968        snprintf(buffer, len - 1, "%s", cp);
1969        if (realpath)
1970                tomoyo_addprintf(buffer, len, " exec.%s", realpath);
1971        if (argv0)
1972                tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
1973        if (symlink)
1974                tomoyo_addprintf(buffer, len, "%s", symlink);
1975        tomoyo_normalize_line(buffer);
1976        if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
1977                                  false))
1978                tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
1979        kfree(buffer);
1980}
1981
1982/**
1983 * tomoyo_supervisor - Ask for the supervisor's decision.
1984 *
1985 * @r:   Pointer to "struct tomoyo_request_info".
1986 * @fmt: The printf()'s format string, followed by parameters.
1987 *
1988 * Returns 0 if the supervisor decided to permit the access request which
1989 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1990 * supervisor decided to retry the access request which violated the policy in
1991 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1992 */
1993int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1994{
1995        va_list args;
1996        int error;
1997        int len;
1998        static unsigned int tomoyo_serial;
1999        struct tomoyo_query entry = { };
2000        bool quota_exceeded = false;
2001        va_start(args, fmt);
2002        len = vsnprintf((char *) &len, 1, fmt, args) + 1;
2003        va_end(args);
2004        /* Write /sys/kernel/security/tomoyo/audit. */
2005        va_start(args, fmt);
2006        tomoyo_write_log2(r, len, fmt, args);
2007        va_end(args);
2008        /* Nothing more to do if granted. */
2009        if (r->granted)
2010                return 0;
2011        if (r->mode)
2012                tomoyo_update_stat(r->mode);
2013        switch (r->mode) {
2014        case TOMOYO_CONFIG_ENFORCING:
2015                error = -EPERM;
2016                if (atomic_read(&tomoyo_query_observers))
2017                        break;
2018                goto out;
2019        case TOMOYO_CONFIG_LEARNING:
2020                error = 0;
2021                /* Check max_learning_entry parameter. */
2022                if (tomoyo_domain_quota_is_ok(r))
2023                        break;
2024                /* fall through */
2025        default:
2026                return 0;
2027        }
2028        /* Get message. */
2029        va_start(args, fmt);
2030        entry.query = tomoyo_init_log(r, len, fmt, args);
2031        va_end(args);
2032        if (!entry.query)
2033                goto out;
2034        entry.query_len = strlen(entry.query) + 1;
2035        if (!error) {
2036                tomoyo_add_entry(r->domain, entry.query);
2037                goto out;
2038        }
2039        len = tomoyo_round2(entry.query_len);
2040        entry.domain = r->domain;
2041        spin_lock(&tomoyo_query_list_lock);
2042        if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
2043            tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
2044            >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
2045                quota_exceeded = true;
2046        } else {
2047                entry.serial = tomoyo_serial++;
2048                entry.retry = r->retry;
2049                tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
2050                list_add_tail(&entry.list, &tomoyo_query_list);
2051        }
2052        spin_unlock(&tomoyo_query_list_lock);
2053        if (quota_exceeded)
2054                goto out;
2055        /* Give 10 seconds for supervisor's opinion. */
2056        while (entry.timer < 10) {
2057                wake_up_all(&tomoyo_query_wait);
2058                if (wait_event_interruptible_timeout
2059                    (tomoyo_answer_wait, entry.answer ||
2060                     !atomic_read(&tomoyo_query_observers), HZ))
2061                        break;
2062                else
2063                        entry.timer++;
2064        }
2065        spin_lock(&tomoyo_query_list_lock);
2066        list_del(&entry.list);
2067        tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
2068        spin_unlock(&tomoyo_query_list_lock);
2069        switch (entry.answer) {
2070        case 3: /* Asked to retry by administrator. */
2071                error = TOMOYO_RETRY_REQUEST;
2072                r->retry++;
2073                break;
2074        case 1:
2075                /* Granted by administrator. */
2076                error = 0;
2077                break;
2078        default:
2079                /* Timed out or rejected by administrator. */
2080                break;
2081        }
2082out:
2083        kfree(entry.query);
2084        return error;
2085}
2086
2087/**
2088 * tomoyo_find_domain_by_qid - Get domain by query id.
2089 *
2090 * @serial: Query ID assigned by tomoyo_supervisor().
2091 *
2092 * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
2093 */
2094static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
2095(unsigned int serial)
2096{
2097        struct tomoyo_query *ptr;
2098        struct tomoyo_domain_info *domain = NULL;
2099        spin_lock(&tomoyo_query_list_lock);
2100        list_for_each_entry(ptr, &tomoyo_query_list, list) {
2101                if (ptr->serial != serial)
2102                        continue;
2103                domain = ptr->domain;
2104                break;
2105        }
2106        spin_unlock(&tomoyo_query_list_lock);
2107        return domain;
2108}
2109
2110/**
2111 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
2112 *
2113 * @file: Pointer to "struct file".
2114 * @wait: Pointer to "poll_table".
2115 *
2116 * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
2117 *
2118 * Waits for access requests which violated policy in enforcing mode.
2119 */
2120static unsigned int tomoyo_poll_query(struct file *file, poll_table *wait)
2121{
2122        if (!list_empty(&tomoyo_query_list))
2123                return POLLIN | POLLRDNORM;
2124        poll_wait(file, &tomoyo_query_wait, wait);
2125        if (!list_empty(&tomoyo_query_list))
2126                return POLLIN | POLLRDNORM;
2127        return 0;
2128}
2129
2130/**
2131 * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
2132 *
2133 * @head: Pointer to "struct tomoyo_io_buffer".
2134 */
2135static void tomoyo_read_query(struct tomoyo_io_buffer *head)
2136{
2137        struct list_head *tmp;
2138        unsigned int pos = 0;
2139        size_t len = 0;
2140        char *buf;
2141        if (head->r.w_pos)
2142                return;
2143        if (head->read_buf) {
2144                kfree(head->read_buf);
2145                head->read_buf = NULL;
2146        }
2147        spin_lock(&tomoyo_query_list_lock);
2148        list_for_each(tmp, &tomoyo_query_list) {
2149                struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2150                if (pos++ != head->r.query_index)
2151                        continue;
2152                len = ptr->query_len;
2153                break;
2154        }
2155        spin_unlock(&tomoyo_query_list_lock);
2156        if (!len) {
2157                head->r.query_index = 0;
2158                return;
2159        }
2160        buf = kzalloc(len + 32, GFP_NOFS);
2161        if (!buf)
2162                return;
2163        pos = 0;
2164        spin_lock(&tomoyo_query_list_lock);
2165        list_for_each(tmp, &tomoyo_query_list) {
2166                struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2167                if (pos++ != head->r.query_index)
2168                        continue;
2169                /*
2170                 * Some query can be skipped because tomoyo_query_list
2171                 * can change, but I don't care.
2172                 */
2173                if (len == ptr->query_len)
2174                        snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
2175                                 ptr->retry, ptr->query);
2176                break;
2177        }
2178        spin_unlock(&tomoyo_query_list_lock);
2179        if (buf[0]) {
2180                head->read_buf = buf;
2181                head->r.w[head->r.w_pos++] = buf;
2182                head->r.query_index++;
2183        } else {
2184                kfree(buf);
2185        }
2186}
2187
2188/**
2189 * tomoyo_write_answer - Write the supervisor's decision.
2190 *
2191 * @head: Pointer to "struct tomoyo_io_buffer".
2192 *
2193 * Returns 0 on success, -EINVAL otherwise.
2194 */
2195static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
2196{
2197        char *data = head->write_buf;
2198        struct list_head *tmp;
2199        unsigned int serial;
2200        unsigned int answer;
2201        spin_lock(&tomoyo_query_list_lock);
2202        list_for_each(tmp, &tomoyo_query_list) {
2203                struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2204                ptr->timer = 0;
2205        }
2206        spin_unlock(&tomoyo_query_list_lock);
2207        if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
2208                return -EINVAL;
2209        spin_lock(&tomoyo_query_list_lock);
2210        list_for_each(tmp, &tomoyo_query_list) {
2211                struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2212                if (ptr->serial != serial)
2213                        continue;
2214                ptr->answer = answer;
2215                /* Remove from tomoyo_query_list. */
2216                if (ptr->answer)
2217                        list_del_init(&ptr->list);
2218                break;
2219        }
2220        spin_unlock(&tomoyo_query_list_lock);
2221        return 0;
2222}
2223
2224/**
2225 * tomoyo_read_version: Get version.
2226 *
2227 * @head: Pointer to "struct tomoyo_io_buffer".
2228 *
2229 * Returns version information.
2230 */
2231static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2232{
2233        if (!head->r.eof) {
2234                tomoyo_io_printf(head, "2.5.0");
2235                head->r.eof = true;
2236        }
2237}
2238
2239/* String table for /sys/kernel/security/tomoyo/stat interface. */
2240static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2241        [TOMOYO_STAT_POLICY_UPDATES]    = "update:",
2242        [TOMOYO_STAT_POLICY_LEARNING]   = "violation in learning mode:",
2243        [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2244        [TOMOYO_STAT_POLICY_ENFORCING]  = "violation in enforcing mode:",
2245};
2246
2247/* String table for /sys/kernel/security/tomoyo/stat interface. */
2248static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2249        [TOMOYO_MEMORY_POLICY] = "policy:",
2250        [TOMOYO_MEMORY_AUDIT]  = "audit log:",
2251        [TOMOYO_MEMORY_QUERY]  = "query message:",
2252};
2253
2254/* Timestamp counter for last updated. */
2255static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2256/* Counter for number of updates. */
2257static unsigned int tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2258
2259/**
2260 * tomoyo_update_stat - Update statistic counters.
2261 *
2262 * @index: Index for policy type.
2263 *
2264 * Returns nothing.
2265 */
2266void tomoyo_update_stat(const u8 index)
2267{
2268        struct timeval tv;
2269        do_gettimeofday(&tv);
2270        /*
2271         * I don't use atomic operations because race condition is not fatal.
2272         */
2273        tomoyo_stat_updated[index]++;
2274        tomoyo_stat_modified[index] = tv.tv_sec;
2275}
2276
2277/**
2278 * tomoyo_read_stat - Read statistic data.
2279 *
2280 * @head: Pointer to "struct tomoyo_io_buffer".
2281 *
2282 * Returns nothing.
2283 */
2284static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2285{
2286        u8 i;
2287        unsigned int total = 0;
2288        if (head->r.eof)
2289                return;
2290        for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2291                tomoyo_io_printf(head, "Policy %-30s %10u",
2292                                 tomoyo_policy_headers[i],
2293                                 tomoyo_stat_updated[i]);
2294                if (tomoyo_stat_modified[i]) {
2295                        struct tomoyo_time stamp;
2296                        tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2297                        tomoyo_io_printf(head, " (Last: %04u/%02u/%02u "
2298                                         "%02u:%02u:%02u)",
2299                                         stamp.year, stamp.month, stamp.day,
2300                                         stamp.hour, stamp.min, stamp.sec);
2301                }
2302                tomoyo_set_lf(head);
2303        }
2304        for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2305                unsigned int used = tomoyo_memory_used[i];
2306                total += used;
2307                tomoyo_io_printf(head, "Memory used by %-22s %10u",
2308                                 tomoyo_memory_headers[i], used);
2309                used = tomoyo_memory_quota[i];
2310                if (used)
2311                        tomoyo_io_printf(head, " (Quota: %10u)", used);
2312                tomoyo_set_lf(head);
2313        }
2314        tomoyo_io_printf(head, "Total memory used:                    %10u\n",
2315                         total);
2316        head->r.eof = true;
2317}
2318
2319/**
2320 * tomoyo_write_stat - Set memory quota.
2321 *
2322 * @head: Pointer to "struct tomoyo_io_buffer".
2323 *
2324 * Returns 0.
2325 */
2326static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2327{
2328        char *data = head->write_buf;
2329        u8 i;
2330        if (tomoyo_str_starts(&data, "Memory used by "))
2331                for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2332                        if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2333                                sscanf(data, "%u", &tomoyo_memory_quota[i]);
2334        return 0;
2335}
2336
2337/**
2338 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2339 *
2340 * @type: Type of interface.
2341 * @file: Pointer to "struct file".
2342 *
2343 * Returns 0 on success, negative value otherwise.
2344 */
2345int tomoyo_open_control(const u8 type, struct file *file)
2346{
2347        struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2348
2349        if (!head)
2350                return -ENOMEM;
2351        mutex_init(&head->io_sem);
2352        head->type = type;
2353        switch (type) {
2354        case TOMOYO_DOMAINPOLICY:
2355                /* /sys/kernel/security/tomoyo/domain_policy */
2356                head->write = tomoyo_write_domain;
2357                head->read = tomoyo_read_domain;
2358                break;
2359        case TOMOYO_EXCEPTIONPOLICY:
2360                /* /sys/kernel/security/tomoyo/exception_policy */
2361                head->write = tomoyo_write_exception;
2362                head->read = tomoyo_read_exception;
2363                break;
2364        case TOMOYO_AUDIT:
2365                /* /sys/kernel/security/tomoyo/audit */
2366                head->poll = tomoyo_poll_log;
2367                head->read = tomoyo_read_log;
2368                break;
2369        case TOMOYO_PROCESS_STATUS:
2370                /* /sys/kernel/security/tomoyo/.process_status */
2371                head->write = tomoyo_write_pid;
2372                head->read = tomoyo_read_pid;
2373                break;
2374        case TOMOYO_VERSION:
2375                /* /sys/kernel/security/tomoyo/version */
2376                head->read = tomoyo_read_version;
2377                head->readbuf_size = 128;
2378                break;
2379        case TOMOYO_STAT:
2380                /* /sys/kernel/security/tomoyo/stat */
2381                head->write = tomoyo_write_stat;
2382                head->read = tomoyo_read_stat;
2383                head->readbuf_size = 1024;
2384                break;
2385        case TOMOYO_PROFILE:
2386                /* /sys/kernel/security/tomoyo/profile */
2387                head->write = tomoyo_write_profile;
2388                head->read = tomoyo_read_profile;
2389                break;
2390        case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2391                head->poll = tomoyo_poll_query;
2392                head->write = tomoyo_write_answer;
2393                head->read = tomoyo_read_query;
2394                break;
2395        case TOMOYO_MANAGER:
2396                /* /sys/kernel/security/tomoyo/manager */
2397                head->write = tomoyo_write_manager;
2398                head->read = tomoyo_read_manager;
2399                break;
2400        }
2401        if (!(file->f_mode & FMODE_READ)) {
2402                /*
2403                 * No need to allocate read_buf since it is not opened
2404                 * for reading.
2405                 */
2406                head->read = NULL;
2407                head->poll = NULL;
2408        } else if (!head->poll) {
2409                /* Don't allocate read_buf for poll() access. */
2410                if (!head->readbuf_size)
2411                        head->readbuf_size = 4096 * 2;
2412                head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2413                if (!head->read_buf) {
2414                        kfree(head);
2415                        return -ENOMEM;
2416                }
2417        }
2418        if (!(file->f_mode & FMODE_WRITE)) {
2419                /*
2420                 * No need to allocate write_buf since it is not opened
2421                 * for writing.
2422                 */
2423                head->write = NULL;
2424        } else if (head->write) {
2425                head->writebuf_size = 4096 * 2;
2426                head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2427                if (!head->write_buf) {
2428                        kfree(head->read_buf);
2429                        kfree(head);
2430                        return -ENOMEM;
2431                }
2432        }
2433        /*
2434         * If the file is /sys/kernel/security/tomoyo/query , increment the
2435         * observer counter.
2436         * The obserber counter is used by tomoyo_supervisor() to see if
2437         * there is some process monitoring /sys/kernel/security/tomoyo/query.
2438         */
2439        if (type == TOMOYO_QUERY)
2440                atomic_inc(&tomoyo_query_observers);
2441        file->private_data = head;
2442        tomoyo_notify_gc(head, true);
2443        return 0;
2444}
2445
2446/**
2447 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2448 *
2449 * @file: Pointer to "struct file".
2450 * @wait: Pointer to "poll_table". Maybe NULL.
2451 *
2452 * Returns POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM if ready to read/write,
2453 * POLLOUT | POLLWRNORM otherwise.
2454 */
2455unsigned int tomoyo_poll_control(struct file *file, poll_table *wait)
2456{
2457        struct tomoyo_io_buffer *head = file->private_data;
2458        if (head->poll)
2459                return head->poll(file, wait) | POLLOUT | POLLWRNORM;
2460        return POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM;
2461}
2462
2463/**
2464 * tomoyo_set_namespace_cursor - Set namespace to read.
2465 *
2466 * @head: Pointer to "struct tomoyo_io_buffer".
2467 *
2468 * Returns nothing.
2469 */
2470static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2471{
2472        struct list_head *ns;
2473        if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2474            head->type != TOMOYO_PROFILE)
2475                return;
2476        /*
2477         * If this is the first read, or reading previous namespace finished
2478         * and has more namespaces to read, update the namespace cursor.
2479         */
2480        ns = head->r.ns;
2481        if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2482                /* Clearing is OK because tomoyo_flush() returned true. */
2483                memset(&head->r, 0, sizeof(head->r));
2484                head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2485        }
2486}
2487
2488/**
2489 * tomoyo_has_more_namespace - Check for unread namespaces.
2490 *
2491 * @head: Pointer to "struct tomoyo_io_buffer".
2492 *
2493 * Returns true if we have more entries to print, false otherwise.
2494 */
2495static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2496{
2497        return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2498                head->type == TOMOYO_PROFILE) && head->r.eof &&
2499                head->r.ns->next != &tomoyo_namespace_list;
2500}
2501
2502/**
2503 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2504 *
2505 * @head:       Pointer to "struct tomoyo_io_buffer".
2506 * @buffer:     Poiner to buffer to write to.
2507 * @buffer_len: Size of @buffer.
2508 *
2509 * Returns bytes read on success, negative value otherwise.
2510 */
2511ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2512                            const int buffer_len)
2513{
2514        int len;
2515        int idx;
2516
2517        if (!head->read)
2518                return -ENOSYS;
2519        if (mutex_lock_interruptible(&head->io_sem))
2520                return -EINTR;
2521        head->read_user_buf = buffer;
2522        head->read_user_buf_avail = buffer_len;
2523        idx = tomoyo_read_lock();
2524        if (tomoyo_flush(head))
2525                /* Call the policy handler. */
2526                do {
2527                        tomoyo_set_namespace_cursor(head);
2528                        head->read(head);
2529                } while (tomoyo_flush(head) &&
2530                         tomoyo_has_more_namespace(head));
2531        tomoyo_read_unlock(idx);
2532        len = head->read_user_buf - buffer;
2533        mutex_unlock(&head->io_sem);
2534        return len;
2535}
2536
2537/**
2538 * tomoyo_parse_policy - Parse a policy line.
2539 *
2540 * @head: Poiter to "struct tomoyo_io_buffer".
2541 * @line: Line to parse.
2542 *
2543 * Returns 0 on success, negative value otherwise.
2544 *
2545 * Caller holds tomoyo_read_lock().
2546 */
2547static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2548{
2549        /* Delete request? */
2550        head->w.is_delete = !strncmp(line, "delete ", 7);
2551        if (head->w.is_delete)
2552                memmove(line, line + 7, strlen(line + 7) + 1);
2553        /* Selecting namespace to update. */
2554        if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2555            head->type == TOMOYO_PROFILE) {
2556                if (*line == '<') {
2557                        char *cp = strchr(line, ' ');
2558                        if (cp) {
2559                                *cp++ = '\0';
2560                                head->w.ns = tomoyo_assign_namespace(line);
2561                                memmove(line, cp, strlen(cp) + 1);
2562                        } else
2563                                head->w.ns = NULL;
2564                } else
2565                        head->w.ns = &tomoyo_kernel_namespace;
2566                /* Don't allow updating if namespace is invalid. */
2567                if (!head->w.ns)
2568                        return -ENOENT;
2569        }
2570        /* Do the update. */
2571        return head->write(head);
2572}
2573
2574/**
2575 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2576 *
2577 * @head:       Pointer to "struct tomoyo_io_buffer".
2578 * @buffer:     Pointer to buffer to read from.
2579 * @buffer_len: Size of @buffer.
2580 *
2581 * Returns @buffer_len on success, negative value otherwise.
2582 */
2583ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2584                             const char __user *buffer, const int buffer_len)
2585{
2586        int error = buffer_len;
2587        size_t avail_len = buffer_len;
2588        char *cp0 = head->write_buf;
2589        int idx;
2590        if (!head->write)
2591                return -ENOSYS;
2592        if (!access_ok(VERIFY_READ, buffer, buffer_len))
2593                return -EFAULT;
2594        if (mutex_lock_interruptible(&head->io_sem))
2595                return -EINTR;
2596        head->read_user_buf_avail = 0;
2597        idx = tomoyo_read_lock();
2598        /* Read a line and dispatch it to the policy handler. */
2599        while (avail_len > 0) {
2600                char c;
2601                if (head->w.avail >= head->writebuf_size - 1) {
2602                        const int len = head->writebuf_size * 2;
2603                        char *cp = kzalloc(len, GFP_NOFS);
2604                        if (!cp) {
2605                                error = -ENOMEM;
2606                                break;
2607                        }
2608                        memmove(cp, cp0, head->w.avail);
2609                        kfree(cp0);
2610                        head->write_buf = cp;
2611                        cp0 = cp;
2612                        head->writebuf_size = len;
2613                }
2614                if (get_user(c, buffer)) {
2615                        error = -EFAULT;
2616                        break;
2617                }
2618                buffer++;
2619                avail_len--;
2620                cp0[head->w.avail++] = c;
2621                if (c != '\n')
2622                        continue;
2623                cp0[head->w.avail - 1] = '\0';
2624                head->w.avail = 0;
2625                tomoyo_normalize_line(cp0);
2626                if (!strcmp(cp0, "reset")) {
2627                        head->w.ns = &tomoyo_kernel_namespace;
2628                        head->w.domain = NULL;
2629                        memset(&head->r, 0, sizeof(head->r));
2630                        continue;
2631                }
2632                /* Don't allow updating policies by non manager programs. */
2633                switch (head->type) {
2634                case TOMOYO_PROCESS_STATUS:
2635                        /* This does not write anything. */
2636                        break;
2637                case TOMOYO_DOMAINPOLICY:
2638                        if (tomoyo_select_domain(head, cp0))
2639                                continue;
2640                        /* fall through */
2641                case TOMOYO_EXCEPTIONPOLICY:
2642                        if (!strcmp(cp0, "select transition_only")) {
2643                                head->r.print_transition_related_only = true;
2644                                continue;
2645                        }
2646                        /* fall through */
2647                default:
2648                        if (!tomoyo_manager()) {
2649                                error = -EPERM;
2650                                goto out;
2651                        }
2652                }
2653                switch (tomoyo_parse_policy(head, cp0)) {
2654                case -EPERM:
2655                        error = -EPERM;
2656                        goto out;
2657                case 0:
2658                        switch (head->type) {
2659                        case TOMOYO_DOMAINPOLICY:
2660                        case TOMOYO_EXCEPTIONPOLICY:
2661                        case TOMOYO_STAT:
2662                        case TOMOYO_PROFILE:
2663                        case TOMOYO_MANAGER:
2664                                tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2665                                break;
2666                        default:
2667                                break;
2668                        }
2669                        break;
2670                }
2671        }
2672out:
2673        tomoyo_read_unlock(idx);
2674        mutex_unlock(&head->io_sem);
2675        return error;
2676}
2677
2678/**
2679 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2680 *
2681 * @head: Pointer to "struct tomoyo_io_buffer".
2682 *
2683 * Returns 0.
2684 */
2685int tomoyo_close_control(struct tomoyo_io_buffer *head)
2686{
2687        /*
2688         * If the file is /sys/kernel/security/tomoyo/query , decrement the
2689         * observer counter.
2690         */
2691        if (head->type == TOMOYO_QUERY &&
2692            atomic_dec_and_test(&tomoyo_query_observers))
2693                wake_up_all(&tomoyo_answer_wait);
2694        tomoyo_notify_gc(head, false);
2695        return 0;
2696}
2697
2698/**
2699 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2700 */
2701void tomoyo_check_profile(void)
2702{
2703        struct tomoyo_domain_info *domain;
2704        const int idx = tomoyo_read_lock();
2705        tomoyo_policy_loaded = true;
2706        printk(KERN_INFO "TOMOYO: 2.5.0\n");
2707        list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2708                const u8 profile = domain->profile;
2709                const struct tomoyo_policy_namespace *ns = domain->ns;
2710                if (ns->profile_version != 20110903)
2711                        printk(KERN_ERR
2712                               "Profile version %u is not supported.\n",
2713                               ns->profile_version);
2714                else if (!ns->profile_ptr[profile])
2715                        printk(KERN_ERR
2716                               "Profile %u (used by '%s') is not defined.\n",
2717                               profile, domain->domainname->name);
2718                else
2719                        continue;
2720                printk(KERN_ERR
2721                       "Userland tools for TOMOYO 2.5 must be installed and "
2722                       "policy must be initialized.\n");
2723                printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.5/ "
2724                       "for more information.\n");
2725                panic("STOP!");
2726        }
2727        tomoyo_read_unlock(idx);
2728        printk(KERN_INFO "Mandatory Access Control activated.\n");
2729}
2730
2731/**
2732 * tomoyo_load_builtin_policy - Load built-in policy.
2733 *
2734 * Returns nothing.
2735 */
2736void __init tomoyo_load_builtin_policy(void)
2737{
2738        /*
2739         * This include file is manually created and contains built-in policy
2740         * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2741         * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2742         * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2743         */
2744#include "builtin-policy.h"
2745        u8 i;
2746        const int idx = tomoyo_read_lock();
2747        for (i = 0; i < 5; i++) {
2748                struct tomoyo_io_buffer head = { };
2749                char *start = "";
2750                switch (i) {
2751                case 0:
2752                        start = tomoyo_builtin_profile;
2753                        head.type = TOMOYO_PROFILE;
2754                        head.write = tomoyo_write_profile;
2755                        break;
2756                case 1:
2757                        start = tomoyo_builtin_exception_policy;
2758                        head.type = TOMOYO_EXCEPTIONPOLICY;
2759                        head.write = tomoyo_write_exception;
2760                        break;
2761                case 2:
2762                        start = tomoyo_builtin_domain_policy;
2763                        head.type = TOMOYO_DOMAINPOLICY;
2764                        head.write = tomoyo_write_domain;
2765                        break;
2766                case 3:
2767                        start = tomoyo_builtin_manager;
2768                        head.type = TOMOYO_MANAGER;
2769                        head.write = tomoyo_write_manager;
2770                        break;
2771                case 4:
2772                        start = tomoyo_builtin_stat;
2773                        head.type = TOMOYO_STAT;
2774                        head.write = tomoyo_write_stat;
2775                        break;
2776                }
2777                while (1) {
2778                        char *end = strchr(start, '\n');
2779                        if (!end)
2780                                break;
2781                        *end = '\0';
2782                        tomoyo_normalize_line(start);
2783                        head.write_buf = start;
2784                        tomoyo_parse_policy(&head, start);
2785                        start = end + 1;
2786                }
2787        }
2788        tomoyo_read_unlock(idx);
2789#ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2790        tomoyo_check_profile();
2791#endif
2792}
2793
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