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 &&
 929            (!uid_eq(task->cred->uid,  GLOBAL_ROOT_UID) ||
 930             !uid_eq(task->cred->euid, GLOBAL_ROOT_UID)))
 931                return false;
 932        exe = tomoyo_get_exe();
 933        if (!exe)
 934                return false;
 935        list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
 936                                policy_list[TOMOYO_ID_MANAGER], head.list) {
 937                if (!ptr->head.is_deleted &&
 938                    (!tomoyo_pathcmp(domainname, ptr->manager) ||
 939                     !strcmp(exe, ptr->manager->name))) {
 940                        found = true;
 941                        break;
 942                }
 943        }
 944        if (!found) { /* Reduce error messages. */
 945                static pid_t last_pid;
 946                const pid_t pid = current->pid;
 947                if (last_pid != pid) {
 948                        printk(KERN_WARNING "%s ( %s ) is not permitted to "
 949                               "update policies.\n", domainname->name, exe);
 950                        last_pid = pid;
 951                }
 952        }
 953        kfree(exe);
 954        return found;
 955}
 956
 957static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
 958(unsigned int serial);
 959
 960/**
 961 * tomoyo_select_domain - Parse select command.
 962 *
 963 * @head: Pointer to "struct tomoyo_io_buffer".
 964 * @data: String to parse.
 965 *
 966 * Returns true on success, false otherwise.
 967 *
 968 * Caller holds tomoyo_read_lock().
 969 */
 970static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
 971                                 const char *data)
 972{
 973        unsigned int pid;
 974        struct tomoyo_domain_info *domain = NULL;
 975        bool global_pid = false;
 976        if (strncmp(data, "select ", 7))
 977                return false;
 978        data += 7;
 979        if (sscanf(data, "pid=%u", &pid) == 1 ||
 980            (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
 981                struct task_struct *p;
 982                rcu_read_lock();
 983                if (global_pid)
 984                        p = find_task_by_pid_ns(pid, &init_pid_ns);
 985                else
 986                        p = find_task_by_vpid(pid);
 987                if (p)
 988                        domain = tomoyo_real_domain(p);
 989                rcu_read_unlock();
 990        } else if (!strncmp(data, "domain=", 7)) {
 991                if (tomoyo_domain_def(data + 7))
 992                        domain = tomoyo_find_domain(data + 7);
 993        } else if (sscanf(data, "Q=%u", &pid) == 1) {
 994                domain = tomoyo_find_domain_by_qid(pid);
 995        } else
 996                return false;
 997        head->w.domain = domain;
 998        /* Accessing read_buf is safe because head->io_sem is held. */
 999        if (!head->read_buf)
1000                return true; /* Do nothing if open(O_WRONLY). */
1001        memset(&head->r, 0, sizeof(head->r));
1002        head->r.print_this_domain_only = true;
1003        if (domain)
1004                head->r.domain = &domain->list;
1005        else
1006                head->r.eof = 1;
1007        tomoyo_io_printf(head, "# select %s\n", data);
1008        if (domain && domain->is_deleted)
1009                tomoyo_io_printf(head, "# This is a deleted domain.\n");
1010        return true;
1011}
1012
1013/**
1014 * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry.
1015 *
1016 * @a: Pointer to "struct tomoyo_acl_info".
1017 * @b: Pointer to "struct tomoyo_acl_info".
1018 *
1019 * Returns true if @a == @b, false otherwise.
1020 */
1021static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a,
1022                              const struct tomoyo_acl_info *b)
1023{
1024        const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head);
1025        const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head);
1026        return p1->domainname == p2->domainname;
1027}
1028
1029/**
1030 * tomoyo_write_task - Update task related list.
1031 *
1032 * @param: Pointer to "struct tomoyo_acl_param".
1033 *
1034 * Returns 0 on success, negative value otherwise.
1035 *
1036 * Caller holds tomoyo_read_lock().
1037 */
1038static int tomoyo_write_task(struct tomoyo_acl_param *param)
1039{
1040        int error = -EINVAL;
1041        if (tomoyo_str_starts(&param->data, "manual_domain_transition ")) {
1042                struct tomoyo_task_acl e = {
1043                        .head.type = TOMOYO_TYPE_MANUAL_TASK_ACL,
1044                        .domainname = tomoyo_get_domainname(param),
1045                };
1046                if (e.domainname)
1047                        error = tomoyo_update_domain(&e.head, sizeof(e), param,
1048                                                     tomoyo_same_task_acl,
1049                                                     NULL);
1050                tomoyo_put_name(e.domainname);
1051        }
1052        return error;
1053}
1054
1055/**
1056 * tomoyo_delete_domain - Delete a domain.
1057 *
1058 * @domainname: The name of domain.
1059 *
1060 * Returns 0 on success, negative value otherwise.
1061 *
1062 * Caller holds tomoyo_read_lock().
1063 */
1064static int tomoyo_delete_domain(char *domainname)
1065{
1066        struct tomoyo_domain_info *domain;
1067        struct tomoyo_path_info name;
1068
1069        name.name = domainname;
1070        tomoyo_fill_path_info(&name);
1071        if (mutex_lock_interruptible(&tomoyo_policy_lock))
1072                return -EINTR;
1073        /* Is there an active domain? */
1074        list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1075                /* Never delete tomoyo_kernel_domain */
1076                if (domain == &tomoyo_kernel_domain)
1077                        continue;
1078                if (domain->is_deleted ||
1079                    tomoyo_pathcmp(domain->domainname, &name))
1080                        continue;
1081                domain->is_deleted = true;
1082                break;
1083        }
1084        mutex_unlock(&tomoyo_policy_lock);
1085        return 0;
1086}
1087
1088/**
1089 * tomoyo_write_domain2 - Write domain policy.
1090 *
1091 * @ns:        Pointer to "struct tomoyo_policy_namespace".
1092 * @list:      Pointer to "struct list_head".
1093 * @data:      Policy to be interpreted.
1094 * @is_delete: True if it is a delete request.
1095 *
1096 * Returns 0 on success, negative value otherwise.
1097 *
1098 * Caller holds tomoyo_read_lock().
1099 */
1100static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
1101                                struct list_head *list, char *data,
1102                                const bool is_delete)
1103{
1104        struct tomoyo_acl_param param = {
1105                .ns = ns,
1106                .list = list,
1107                .data = data,
1108                .is_delete = is_delete,
1109        };
1110        static const struct {
1111                const char *keyword;
1112                int (*write) (struct tomoyo_acl_param *);
1113        } tomoyo_callback[5] = {
1114                { "file ", tomoyo_write_file },
1115                { "network inet ", tomoyo_write_inet_network },
1116                { "network unix ", tomoyo_write_unix_network },
1117                { "misc ", tomoyo_write_misc },
1118                { "task ", tomoyo_write_task },
1119        };
1120        u8 i;
1121
1122        for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) {
1123                if (!tomoyo_str_starts(&param.data,
1124                                       tomoyo_callback[i].keyword))
1125                        continue;
1126                return tomoyo_callback[i].write(&param);
1127        }
1128        return -EINVAL;
1129}
1130
1131/* String table for domain flags. */
1132const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1133        [TOMOYO_DIF_QUOTA_WARNED]      = "quota_exceeded\n",
1134        [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1135};
1136
1137/**
1138 * tomoyo_write_domain - Write domain policy.
1139 *
1140 * @head: Pointer to "struct tomoyo_io_buffer".
1141 *
1142 * Returns 0 on success, negative value otherwise.
1143 *
1144 * Caller holds tomoyo_read_lock().
1145 */
1146static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1147{
1148        char *data = head->write_buf;
1149        struct tomoyo_policy_namespace *ns;
1150        struct tomoyo_domain_info *domain = head->w.domain;
1151        const bool is_delete = head->w.is_delete;
1152        bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1153        unsigned int profile;
1154        if (*data == '<') {
1155                int ret = 0;
1156                domain = NULL;
1157                if (is_delete)
1158                        ret = tomoyo_delete_domain(data);
1159                else if (is_select)
1160                        domain = tomoyo_find_domain(data);
1161                else
1162                        domain = tomoyo_assign_domain(data, false);
1163                head->w.domain = domain;
1164                return ret;
1165        }
1166        if (!domain)
1167                return -EINVAL;
1168        ns = domain->ns;
1169        if (sscanf(data, "use_profile %u", &profile) == 1
1170            && profile < TOMOYO_MAX_PROFILES) {
1171                if (!tomoyo_policy_loaded || ns->profile_ptr[profile])
1172                        domain->profile = (u8) profile;
1173                return 0;
1174        }
1175        if (sscanf(data, "use_group %u\n", &profile) == 1
1176            && profile < TOMOYO_MAX_ACL_GROUPS) {
1177                if (!is_delete)
1178                        domain->group = (u8) profile;
1179                return 0;
1180        }
1181        for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) {
1182                const char *cp = tomoyo_dif[profile];
1183                if (strncmp(data, cp, strlen(cp) - 1))
1184                        continue;
1185                domain->flags[profile] = !is_delete;
1186                return 0;
1187        }
1188        return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1189                                    is_delete);
1190}
1191
1192/**
1193 * tomoyo_print_condition - Print condition part.
1194 *
1195 * @head: Pointer to "struct tomoyo_io_buffer".
1196 * @cond: Pointer to "struct tomoyo_condition".
1197 *
1198 * Returns true on success, false otherwise.
1199 */
1200static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1201                                   const struct tomoyo_condition *cond)
1202{
1203        switch (head->r.cond_step) {
1204        case 0:
1205                head->r.cond_index = 0;
1206                head->r.cond_step++;
1207                if (cond->transit) {
1208                        tomoyo_set_space(head);
1209                        tomoyo_set_string(head, cond->transit->name);
1210                }
1211                /* fall through */
1212        case 1:
1213                {
1214                        const u16 condc = cond->condc;
1215                        const struct tomoyo_condition_element *condp =
1216                                (typeof(condp)) (cond + 1);
1217                        const struct tomoyo_number_union *numbers_p =
1218                                (typeof(numbers_p)) (condp + condc);
1219                        const struct tomoyo_name_union *names_p =
1220                                (typeof(names_p))
1221                                (numbers_p + cond->numbers_count);
1222                        const struct tomoyo_argv *argv =
1223                                (typeof(argv)) (names_p + cond->names_count);
1224                        const struct tomoyo_envp *envp =
1225                                (typeof(envp)) (argv + cond->argc);
1226                        u16 skip;
1227                        for (skip = 0; skip < head->r.cond_index; skip++) {
1228                                const u8 left = condp->left;
1229                                const u8 right = condp->right;
1230                                condp++;
1231                                switch (left) {
1232                                case TOMOYO_ARGV_ENTRY:
1233                                        argv++;
1234                                        continue;
1235                                case TOMOYO_ENVP_ENTRY:
1236                                        envp++;
1237                                        continue;
1238                                case TOMOYO_NUMBER_UNION:
1239                                        numbers_p++;
1240                                        break;
1241                                }
1242                                switch (right) {
1243                                case TOMOYO_NAME_UNION:
1244                                        names_p++;
1245                                        break;
1246                                case TOMOYO_NUMBER_UNION:
1247                                        numbers_p++;
1248                                        break;
1249                                }
1250                        }
1251                        while (head->r.cond_index < condc) {
1252                                const u8 match = condp->equals;
1253                                const u8 left = condp->left;
1254                                const u8 right = condp->right;
1255                                if (!tomoyo_flush(head))
1256                                        return false;
1257                                condp++;
1258                                head->r.cond_index++;
1259                                tomoyo_set_space(head);
1260                                switch (left) {
1261                                case TOMOYO_ARGV_ENTRY:
1262                                        tomoyo_io_printf(head,
1263                                                         "exec.argv[%lu]%s=\"",
1264                                                         argv->index, argv->
1265                                                         is_not ? "!" : "");
1266                                        tomoyo_set_string(head,
1267                                                          argv->value->name);
1268                                        tomoyo_set_string(head, "\"");
1269                                        argv++;
1270                                        continue;
1271                                case TOMOYO_ENVP_ENTRY:
1272                                        tomoyo_set_string(head,
1273                                                          "exec.envp[\"");
1274                                        tomoyo_set_string(head,
1275                                                          envp->name->name);
1276                                        tomoyo_io_printf(head, "\"]%s=", envp->
1277                                                         is_not ? "!" : "");
1278                                        if (envp->value) {
1279                                                tomoyo_set_string(head, "\"");
1280                                                tomoyo_set_string(head, envp->
1281                                                                  value->name);
1282                                                tomoyo_set_string(head, "\"");
1283                                        } else {
1284                                                tomoyo_set_string(head,
1285                                                                  "NULL");
1286                                        }
1287                                        envp++;
1288                                        continue;
1289                                case TOMOYO_NUMBER_UNION:
1290                                        tomoyo_print_number_union_nospace
1291                                                (head, numbers_p++);
1292                                        break;
1293                                default:
1294                                        tomoyo_set_string(head,
1295                                               tomoyo_condition_keyword[left]);
1296                                        break;
1297                                }
1298                                tomoyo_set_string(head, match ? "=" : "!=");
1299                                switch (right) {
1300                                case TOMOYO_NAME_UNION:
1301                                        tomoyo_print_name_union_quoted
1302                                                (head, names_p++);
1303                                        break;
1304                                case TOMOYO_NUMBER_UNION:
1305                                        tomoyo_print_number_union_nospace
1306                                                (head, numbers_p++);
1307                                        break;
1308                                default:
1309                                        tomoyo_set_string(head,
1310                                          tomoyo_condition_keyword[right]);
1311                                        break;
1312                                }
1313                        }
1314                }
1315                head->r.cond_step++;
1316                /* fall through */
1317        case 2:
1318                if (!tomoyo_flush(head))
1319                        break;
1320                head->r.cond_step++;
1321                /* fall through */
1322        case 3:
1323                if (cond->grant_log != TOMOYO_GRANTLOG_AUTO)
1324                        tomoyo_io_printf(head, " grant_log=%s",
1325                                         tomoyo_yesno(cond->grant_log ==
1326                                                      TOMOYO_GRANTLOG_YES));
1327                tomoyo_set_lf(head);
1328                return true;
1329        }
1330        return false;
1331}
1332
1333/**
1334 * tomoyo_set_group - Print "acl_group " header keyword and category name.
1335 *
1336 * @head:     Pointer to "struct tomoyo_io_buffer".
1337 * @category: Category name.
1338 *
1339 * Returns nothing.
1340 */
1341static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1342                             const char *category)
1343{
1344        if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1345                tomoyo_print_namespace(head);
1346                tomoyo_io_printf(head, "acl_group %u ",
1347                                 head->r.acl_group_index);
1348        }
1349        tomoyo_set_string(head, category);
1350}
1351
1352/**
1353 * tomoyo_print_entry - Print an ACL entry.
1354 *
1355 * @head: Pointer to "struct tomoyo_io_buffer".
1356 * @acl:  Pointer to an ACL entry.
1357 *
1358 * Returns true on success, false otherwise.
1359 */
1360static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1361                               struct tomoyo_acl_info *acl)
1362{
1363        const u8 acl_type = acl->type;
1364        bool first = true;
1365        u8 bit;
1366
1367        if (head->r.print_cond_part)
1368                goto print_cond_part;
1369        if (acl->is_deleted)
1370                return true;
1371        if (!tomoyo_flush(head))
1372                return false;
1373        else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1374                struct tomoyo_path_acl *ptr =
1375                        container_of(acl, typeof(*ptr), head);
1376                const u16 perm = ptr->perm;
1377                for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1378                        if (!(perm & (1 << bit)))
1379                                continue;
1380                        if (head->r.print_transition_related_only &&
1381                            bit != TOMOYO_TYPE_EXECUTE)
1382                                continue;
1383                        if (first) {
1384                                tomoyo_set_group(head, "file ");
1385                                first = false;
1386                        } else {
1387                                tomoyo_set_slash(head);
1388                        }
1389                        tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1390                }
1391                if (first)
1392                        return true;
1393                tomoyo_print_name_union(head, &ptr->name);
1394        } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) {
1395                struct tomoyo_task_acl *ptr =
1396                        container_of(acl, typeof(*ptr), head);
1397                tomoyo_set_group(head, "task ");
1398                tomoyo_set_string(head, "manual_domain_transition ");
1399                tomoyo_set_string(head, ptr->domainname->name);
1400        } else if (head->r.print_transition_related_only) {
1401                return true;
1402        } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1403                struct tomoyo_path2_acl *ptr =
1404                        container_of(acl, typeof(*ptr), head);
1405                const u8 perm = ptr->perm;
1406                for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1407                        if (!(perm & (1 << bit)))
1408                                continue;
1409                        if (first) {
1410                                tomoyo_set_group(head, "file ");
1411                                first = false;
1412                        } else {
1413                                tomoyo_set_slash(head);
1414                        }
1415                        tomoyo_set_string(head, tomoyo_mac_keywords
1416                                          [tomoyo_pp2mac[bit]]);
1417                }
1418                if (first)
1419                        return true;
1420                tomoyo_print_name_union(head, &ptr->name1);
1421                tomoyo_print_name_union(head, &ptr->name2);
1422        } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1423                struct tomoyo_path_number_acl *ptr =
1424                        container_of(acl, typeof(*ptr), head);
1425                const u8 perm = ptr->perm;
1426                for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1427                        if (!(perm & (1 << bit)))
1428                                continue;
1429                        if (first) {
1430                                tomoyo_set_group(head, "file ");
1431                                first = false;
1432                        } else {
1433                                tomoyo_set_slash(head);
1434                        }
1435                        tomoyo_set_string(head, tomoyo_mac_keywords
1436                                          [tomoyo_pn2mac[bit]]);
1437                }
1438                if (first)
1439                        return true;
1440                tomoyo_print_name_union(head, &ptr->name);
1441                tomoyo_print_number_union(head, &ptr->number);
1442        } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1443                struct tomoyo_mkdev_acl *ptr =
1444                        container_of(acl, typeof(*ptr), head);
1445                const u8 perm = ptr->perm;
1446                for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1447                        if (!(perm & (1 << bit)))
1448                                continue;
1449                        if (first) {
1450                                tomoyo_set_group(head, "file ");
1451                                first = false;
1452                        } else {
1453                                tomoyo_set_slash(head);
1454                        }
1455                        tomoyo_set_string(head, tomoyo_mac_keywords
1456                                          [tomoyo_pnnn2mac[bit]]);
1457                }
1458                if (first)
1459                        return true;
1460                tomoyo_print_name_union(head, &ptr->name);
1461                tomoyo_print_number_union(head, &ptr->mode);
1462                tomoyo_print_number_union(head, &ptr->major);
1463                tomoyo_print_number_union(head, &ptr->minor);
1464        } else if (acl_type == TOMOYO_TYPE_INET_ACL) {
1465                struct tomoyo_inet_acl *ptr =
1466                        container_of(acl, typeof(*ptr), head);
1467                const u8 perm = ptr->perm;
1468
1469                for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1470                        if (!(perm & (1 << bit)))
1471                                continue;
1472                        if (first) {
1473                                tomoyo_set_group(head, "network inet ");
1474                                tomoyo_set_string(head, tomoyo_proto_keyword
1475                                                  [ptr->protocol]);
1476                                tomoyo_set_space(head);
1477                                first = false;
1478                        } else {
1479                                tomoyo_set_slash(head);
1480                        }
1481                        tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1482                }
1483                if (first)
1484                        return true;
1485                tomoyo_set_space(head);
1486                if (ptr->address.group) {
1487                        tomoyo_set_string(head, "@");
1488                        tomoyo_set_string(head, ptr->address.group->group_name
1489                                          ->name);
1490                } else {
1491                        char buf[128];
1492                        tomoyo_print_ip(buf, sizeof(buf), &ptr->address);
1493                        tomoyo_io_printf(head, "%s", buf);
1494                }
1495                tomoyo_print_number_union(head, &ptr->port);
1496        } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) {
1497                struct tomoyo_unix_acl *ptr =
1498                        container_of(acl, typeof(*ptr), head);
1499                const u8 perm = ptr->perm;
1500
1501                for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1502                        if (!(perm & (1 << bit)))
1503                                continue;
1504                        if (first) {
1505                                tomoyo_set_group(head, "network unix ");
1506                                tomoyo_set_string(head, tomoyo_proto_keyword
1507                                                  [ptr->protocol]);
1508                                tomoyo_set_space(head);
1509                                first = false;
1510                        } else {
1511                                tomoyo_set_slash(head);
1512                        }
1513                        tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1514                }
1515                if (first)
1516                        return true;
1517                tomoyo_print_name_union(head, &ptr->name);
1518        } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1519                struct tomoyo_mount_acl *ptr =
1520                        container_of(acl, typeof(*ptr), head);
1521                tomoyo_set_group(head, "file mount");
1522                tomoyo_print_name_union(head, &ptr->dev_name);
1523                tomoyo_print_name_union(head, &ptr->dir_name);
1524                tomoyo_print_name_union(head, &ptr->fs_type);
1525                tomoyo_print_number_union(head, &ptr->flags);
1526        } else if (acl_type == TOMOYO_TYPE_ENV_ACL) {
1527                struct tomoyo_env_acl *ptr =
1528                        container_of(acl, typeof(*ptr), head);
1529
1530                tomoyo_set_group(head, "misc env ");
1531                tomoyo_set_string(head, ptr->env->name);
1532        }
1533        if (acl->cond) {
1534                head->r.print_cond_part = true;
1535                head->r.cond_step = 0;
1536                if (!tomoyo_flush(head))
1537                        return false;
1538print_cond_part:
1539                if (!tomoyo_print_condition(head, acl->cond))
1540                        return false;
1541                head->r.print_cond_part = false;
1542        } else {
1543                tomoyo_set_lf(head);
1544        }
1545        return true;
1546}
1547
1548/**
1549 * tomoyo_read_domain2 - Read domain policy.
1550 *
1551 * @head: Pointer to "struct tomoyo_io_buffer".
1552 * @list: Pointer to "struct list_head".
1553 *
1554 * Caller holds tomoyo_read_lock().
1555 *
1556 * Returns true on success, false otherwise.
1557 */
1558static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1559                                struct list_head *list)
1560{
1561        list_for_each_cookie(head->r.acl, list) {
1562                struct tomoyo_acl_info *ptr =
1563                        list_entry(head->r.acl, typeof(*ptr), list);
1564                if (!tomoyo_print_entry(head, ptr))
1565                        return false;
1566        }
1567        head->r.acl = NULL;
1568        return true;
1569}
1570
1571/**
1572 * tomoyo_read_domain - Read domain policy.
1573 *
1574 * @head: Pointer to "struct tomoyo_io_buffer".
1575 *
1576 * Caller holds tomoyo_read_lock().
1577 */
1578static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1579{
1580        if (head->r.eof)
1581                return;
1582        list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1583                struct tomoyo_domain_info *domain =
1584                        list_entry(head->r.domain, typeof(*domain), list);
1585                switch (head->r.step) {
1586                        u8 i;
1587                case 0:
1588                        if (domain->is_deleted &&
1589                            !head->r.print_this_domain_only)
1590                                continue;
1591                        /* Print domainname and flags. */
1592                        tomoyo_set_string(head, domain->domainname->name);
1593                        tomoyo_set_lf(head);
1594                        tomoyo_io_printf(head, "use_profile %u\n",
1595                                         domain->profile);
1596                        tomoyo_io_printf(head, "use_group %u\n",
1597                                         domain->group);
1598                        for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1599                                if (domain->flags[i])
1600                                        tomoyo_set_string(head, tomoyo_dif[i]);
1601                        head->r.step++;
1602                        tomoyo_set_lf(head);
1603                        /* fall through */
1604                case 1:
1605                        if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1606                                return;
1607                        head->r.step++;
1608                        if (!tomoyo_set_lf(head))
1609                                return;
1610                        /* fall through */
1611                case 2:
1612                        head->r.step = 0;
1613                        if (head->r.print_this_domain_only)
1614                                goto done;
1615                }
1616        }
1617 done:
1618        head->r.eof = true;
1619}
1620
1621/**
1622 * tomoyo_write_pid: Specify PID to obtain domainname.
1623 *
1624 * @head: Pointer to "struct tomoyo_io_buffer".
1625 *
1626 * Returns 0.
1627 */
1628static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1629{
1630        head->r.eof = false;
1631        return 0;
1632}
1633
1634/**
1635 * tomoyo_read_pid - Get domainname of the specified PID.
1636 *
1637 * @head: Pointer to "struct tomoyo_io_buffer".
1638 *
1639 * Returns the domainname which the specified PID is in on success,
1640 * empty string otherwise.
1641 * The PID is specified by tomoyo_write_pid() so that the user can obtain
1642 * using read()/write() interface rather than sysctl() interface.
1643 */
1644static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1645{
1646        char *buf = head->write_buf;
1647        bool global_pid = false;
1648        unsigned int pid;
1649        struct task_struct *p;
1650        struct tomoyo_domain_info *domain = NULL;
1651
1652        /* Accessing write_buf is safe because head->io_sem is held. */
1653        if (!buf) {
1654                head->r.eof = true;
1655                return; /* Do nothing if open(O_RDONLY). */
1656        }
1657        if (head->r.w_pos || head->r.eof)
1658                return;
1659        head->r.eof = true;
1660        if (tomoyo_str_starts(&buf, "global-pid "))
1661                global_pid = true;
1662        pid = (unsigned int) simple_strtoul(buf, NULL, 10);
1663        rcu_read_lock();
1664        if (global_pid)
1665                p = find_task_by_pid_ns(pid, &init_pid_ns);
1666        else
1667                p = find_task_by_vpid(pid);
1668        if (p)
1669                domain = tomoyo_real_domain(p);
1670        rcu_read_unlock();
1671        if (!domain)
1672                return;
1673        tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1674        tomoyo_set_string(head, domain->domainname->name);
1675}
1676
1677/* String table for domain transition control keywords. */
1678static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1679        [TOMOYO_TRANSITION_CONTROL_NO_RESET]      = "no_reset_domain ",
1680        [TOMOYO_TRANSITION_CONTROL_RESET]         = "reset_domain ",
1681        [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1682        [TOMOYO_TRANSITION_CONTROL_INITIALIZE]    = "initialize_domain ",
1683        [TOMOYO_TRANSITION_CONTROL_NO_KEEP]       = "no_keep_domain ",
1684        [TOMOYO_TRANSITION_CONTROL_KEEP]          = "keep_domain ",
1685};
1686
1687/* String table for grouping keywords. */
1688static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1689        [TOMOYO_PATH_GROUP]    = "path_group ",
1690        [TOMOYO_NUMBER_GROUP]  = "number_group ",
1691        [TOMOYO_ADDRESS_GROUP] = "address_group ",
1692};
1693
1694/**
1695 * tomoyo_write_exception - Write exception policy.
1696 *
1697 * @head: Pointer to "struct tomoyo_io_buffer".
1698 *
1699 * Returns 0 on success, negative value otherwise.
1700 *
1701 * Caller holds tomoyo_read_lock().
1702 */
1703static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1704{
1705        const bool is_delete = head->w.is_delete;
1706        struct tomoyo_acl_param param = {
1707                .ns = head->w.ns,
1708                .is_delete = is_delete,
1709                .data = head->write_buf,
1710        };
1711        u8 i;
1712        if (tomoyo_str_starts(&param.data, "aggregator "))
1713                return tomoyo_write_aggregator(&param);
1714        for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1715                if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
1716                        return tomoyo_write_transition_control(&param, i);
1717        for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1718                if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
1719                        return tomoyo_write_group(&param, i);
1720        if (tomoyo_str_starts(&param.data, "acl_group ")) {
1721                unsigned int group;
1722                char *data;
1723                group = simple_strtoul(param.data, &data, 10);
1724                if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1725                        return tomoyo_write_domain2
1726                                (head->w.ns, &head->w.ns->acl_group[group],
1727                                 data, is_delete);
1728        }
1729        return -EINVAL;
1730}
1731
1732/**
1733 * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
1734 *
1735 * @head: Pointer to "struct tomoyo_io_buffer".
1736 * @idx:  Index number.
1737 *
1738 * Returns true on success, false otherwise.
1739 *
1740 * Caller holds tomoyo_read_lock().
1741 */
1742static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1743{
1744        struct tomoyo_policy_namespace *ns =
1745                container_of(head->r.ns, typeof(*ns), namespace_list);
1746        struct list_head *list = &ns->group_list[idx];
1747        list_for_each_cookie(head->r.group, list) {
1748                struct tomoyo_group *group =
1749                        list_entry(head->r.group, typeof(*group), head.list);
1750                list_for_each_cookie(head->r.acl, &group->member_list) {
1751                        struct tomoyo_acl_head *ptr =
1752                                list_entry(head->r.acl, typeof(*ptr), list);
1753                        if (ptr->is_deleted)
1754                                continue;
1755                        if (!tomoyo_flush(head))
1756                                return false;
1757                        tomoyo_print_namespace(head);
1758                        tomoyo_set_string(head, tomoyo_group_name[idx]);
1759                        tomoyo_set_string(head, group->group_name->name);
1760                        if (idx == TOMOYO_PATH_GROUP) {
1761                                tomoyo_set_space(head);
1762                                tomoyo_set_string(head, container_of
1763                                               (ptr, struct tomoyo_path_group,
1764                                                head)->member_name->name);
1765                        } else if (idx == TOMOYO_NUMBER_GROUP) {
1766                                tomoyo_print_number_union(head, &container_of
1767                                                          (ptr,
1768                                                   struct tomoyo_number_group,
1769                                                           head)->number);
1770                        } else if (idx == TOMOYO_ADDRESS_GROUP) {
1771                                char buffer[128];
1772
1773                                struct tomoyo_address_group *member =
1774                                        container_of(ptr, typeof(*member),
1775                                                     head);
1776                                tomoyo_print_ip(buffer, sizeof(buffer),
1777                                                &member->address);
1778                                tomoyo_io_printf(head, " %s", buffer);
1779                        }
1780                        tomoyo_set_lf(head);
1781                }
1782                head->r.acl = NULL;
1783        }
1784        head->r.group = NULL;
1785        return true;
1786}
1787
1788/**
1789 * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1790 *
1791 * @head: Pointer to "struct tomoyo_io_buffer".
1792 * @idx:  Index number.
1793 *
1794 * Returns true on success, false otherwise.
1795 *
1796 * Caller holds tomoyo_read_lock().
1797 */
1798static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1799{
1800        struct tomoyo_policy_namespace *ns =
1801                container_of(head->r.ns, typeof(*ns), namespace_list);
1802        struct list_head *list = &ns->policy_list[idx];
1803        list_for_each_cookie(head->r.acl, list) {
1804                struct tomoyo_acl_head *acl =
1805                        container_of(head->r.acl, typeof(*acl), list);
1806                if (acl->is_deleted)
1807                        continue;
1808                if (!tomoyo_flush(head))
1809                        return false;
1810                switch (idx) {
1811                case TOMOYO_ID_TRANSITION_CONTROL:
1812                        {
1813                                struct tomoyo_transition_control *ptr =
1814                                        container_of(acl, typeof(*ptr), head);
1815                                tomoyo_print_namespace(head);
1816                                tomoyo_set_string(head, tomoyo_transition_type
1817                                                  [ptr->type]);
1818                                tomoyo_set_string(head, ptr->program ?
1819                                                  ptr->program->name : "any");
1820                                tomoyo_set_string(head, " from ");
1821                                tomoyo_set_string(head, ptr->domainname ?
1822                                                  ptr->domainname->name :
1823                                                  "any");
1824                        }
1825                        break;
1826                case TOMOYO_ID_AGGREGATOR:
1827                        {
1828                                struct tomoyo_aggregator *ptr =
1829                                        container_of(acl, typeof(*ptr), head);
1830                                tomoyo_print_namespace(head);
1831                                tomoyo_set_string(head, "aggregator ");
1832                                tomoyo_set_string(head,
1833                                                  ptr->original_name->name);
1834                                tomoyo_set_space(head);
1835                                tomoyo_set_string(head,
1836                                               ptr->aggregated_name->name);
1837                        }
1838                        break;
1839                default:
1840                        continue;
1841                }
1842                tomoyo_set_lf(head);
1843        }
1844        head->r.acl = NULL;
1845        return true;
1846}
1847
1848/**
1849 * tomoyo_read_exception - Read exception policy.
1850 *
1851 * @head: Pointer to "struct tomoyo_io_buffer".
1852 *
1853 * Caller holds tomoyo_read_lock().
1854 */
1855static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1856{
1857        struct tomoyo_policy_namespace *ns =
1858                container_of(head->r.ns, typeof(*ns), namespace_list);
1859        if (head->r.eof)
1860                return;
1861        while (head->r.step < TOMOYO_MAX_POLICY &&
1862               tomoyo_read_policy(head, head->r.step))
1863                head->r.step++;
1864        if (head->r.step < TOMOYO_MAX_POLICY)
1865                return;
1866        while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1867               tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1868                head->r.step++;
1869        if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1870                return;
1871        while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1872               + TOMOYO_MAX_ACL_GROUPS) {
1873                head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1874                        - TOMOYO_MAX_GROUP;
1875                if (!tomoyo_read_domain2(head, &ns->acl_group
1876                                         [head->r.acl_group_index]))
1877                        return;
1878                head->r.step++;
1879        }
1880        head->r.eof = true;
1881}
1882
1883/* Wait queue for kernel -> userspace notification. */
1884static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1885/* Wait queue for userspace -> kernel notification. */
1886static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1887
1888/* Structure for query. */
1889struct tomoyo_query {
1890        struct list_head list;
1891        struct tomoyo_domain_info *domain;
1892        char *query;
1893        size_t query_len;
1894        unsigned int serial;
1895        u8 timer;
1896        u8 answer;
1897        u8 retry;
1898};
1899
1900/* The list for "struct tomoyo_query". */
1901static LIST_HEAD(tomoyo_query_list);
1902
1903/* Lock for manipulating tomoyo_query_list. */
1904static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1905
1906/*
1907 * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1908 * interface.
1909 */
1910static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1911
1912/**
1913 * tomoyo_truncate - Truncate a line.
1914 *
1915 * @str: String to truncate.
1916 *
1917 * Returns length of truncated @str.
1918 */
1919static int tomoyo_truncate(char *str)
1920{
1921        char *start = str;
1922        while (*(unsigned char *) str > (unsigned char) ' ')
1923                str++;
1924        *str = '\0';
1925        return strlen(start) + 1;
1926}
1927
1928/**
1929 * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1930 *
1931 * @domain: Pointer to "struct tomoyo_domain_info".
1932 * @header: Lines containing ACL.
1933 *
1934 * Returns nothing.
1935 */
1936static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
1937{
1938        char *buffer;
1939        char *realpath = NULL;
1940        char *argv0 = NULL;
1941        char *symlink = NULL;
1942        char *cp = strchr(header, '\n');
1943        int len;
1944        if (!cp)
1945                return;
1946        cp = strchr(cp + 1, '\n');
1947        if (!cp)
1948                return;
1949        *cp++ = '\0';
1950        len = strlen(cp) + 1;
1951        /* strstr() will return NULL if ordering is wrong. */
1952        if (*cp == 'f') {
1953                argv0 = strstr(header, " argv[]={ \"");
1954                if (argv0) {
1955                        argv0 += 10;
1956                        len += tomoyo_truncate(argv0) + 14;
1957                }
1958                realpath = strstr(header, " exec={ realpath=\"");
1959                if (realpath) {
1960                        realpath += 8;
1961                        len += tomoyo_truncate(realpath) + 6;
1962                }
1963                symlink = strstr(header, " symlink.target=\"");
1964                if (symlink)
1965                        len += tomoyo_truncate(symlink + 1) + 1;
1966        }
1967        buffer = kmalloc(len, GFP_NOFS);
1968        if (!buffer)
1969                return;
1970        snprintf(buffer, len - 1, "%s", cp);
1971        if (realpath)
1972                tomoyo_addprintf(buffer, len, " exec.%s", realpath);
1973        if (argv0)
1974                tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
1975        if (symlink)
1976                tomoyo_addprintf(buffer, len, "%s", symlink);
1977        tomoyo_normalize_line(buffer);
1978        if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
1979                                  false))
1980                tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
1981        kfree(buffer);
1982}
1983
1984/**
1985 * tomoyo_supervisor - Ask for the supervisor's decision.
1986 *
1987 * @r:   Pointer to "struct tomoyo_request_info".
1988 * @fmt: The printf()'s format string, followed by parameters.
1989 *
1990 * Returns 0 if the supervisor decided to permit the access request which
1991 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1992 * supervisor decided to retry the access request which violated the policy in
1993 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1994 */
1995int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1996{
1997        va_list args;
1998        int error;
1999        int len;
2000        static unsigned int tomoyo_serial;
2001        struct tomoyo_query entry = { };
2002        bool quota_exceeded = false;
2003        va_start(args, fmt);
2004        len = vsnprintf((char *) &len, 1, fmt, args) + 1;
2005        va_end(args);
2006        /* Write /sys/kernel/security/tomoyo/audit. */
2007        va_start(args, fmt);
2008        tomoyo_write_log2(r, len, fmt, args);
2009        va_end(args);
2010        /* Nothing more to do if granted. */
2011        if (r->granted)
2012                return 0;
2013        if (r->mode)
2014                tomoyo_update_stat(r->mode);
2015        switch (r->mode) {
2016        case TOMOYO_CONFIG_ENFORCING:
2017                error = -EPERM;
2018                if (atomic_read(&tomoyo_query_observers))
2019                        break;
2020                goto out;
2021        case TOMOYO_CONFIG_LEARNING:
2022                error = 0;
2023                /* Check max_learning_entry parameter. */
2024                if (tomoyo_domain_quota_is_ok(r))
2025                        break;
2026                /* fall through */
2027        default:
2028                return 0;
2029        }
2030        /* Get message. */
2031        va_start(args, fmt);
2032        entry.query = tomoyo_init_log(r, len, fmt, args);
2033        va_end(args);
2034        if (!entry.query)
2035                goto out;
2036        entry.query_len = strlen(entry.query) + 1;
2037        if (!error) {
2038                tomoyo_add_entry(r->domain, entry.query);
2039                goto out;
2040        }
2041        len = tomoyo_round2(entry.query_len);
2042        entry.domain = r->domain;
2043        spin_lock(&tomoyo_query_list_lock);
2044        if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
2045            tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
2046            >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
2047                quota_exceeded = true;
2048        } else {
2049                entry.serial = tomoyo_serial++;
2050                entry.retry = r->retry;
2051                tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
2052                list_add_tail(&entry.list, &tomoyo_query_list);
2053        }
2054        spin_unlock(&tomoyo_query_list_lock);
2055        if (quota_exceeded)
2056                goto out;
2057        /* Give 10 seconds for supervisor's opinion. */
2058        while (entry.timer < 10) {
2059                wake_up_all(&tomoyo_query_wait);
2060                if (wait_event_interruptible_timeout
2061                    (tomoyo_answer_wait, entry.answer ||
2062                     !atomic_read(&tomoyo_query_observers), HZ))
2063                        break;
2064                else
2065                        entry.timer++;
2066        }
2067        spin_lock(&tomoyo_query_list_lock);
2068        list_del(&entry.list);
2069        tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
2070        spin_unlock(&tomoyo_query_list_lock);
2071        switch (entry.answer) {
2072        case 3: /* Asked to retry by administrator. */
2073                error = TOMOYO_RETRY_REQUEST;
2074                r->retry++;
2075                break;
2076        case 1:
2077                /* Granted by administrator. */
2078                error = 0;
2079                break;
2080        default:
2081                /* Timed out or rejected by administrator. */
2082                break;
2083        }
2084out:
2085        kfree(entry.query);
2086        return error;
2087}
2088
2089/**
2090 * tomoyo_find_domain_by_qid - Get domain by query id.
2091 *
2092 * @serial: Query ID assigned by tomoyo_supervisor().
2093 *
2094 * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
2095 */
2096static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
2097(unsigned int serial)
2098{
2099        struct tomoyo_query *ptr;
2100        struct tomoyo_domain_info *domain = NULL;
2101        spin_lock(&tomoyo_query_list_lock);
2102        list_for_each_entry(ptr, &tomoyo_query_list, list) {
2103                if (ptr->serial != serial)
2104                        continue;
2105                domain = ptr->domain;
2106                break;
2107        }
2108        spin_unlock(&tomoyo_query_list_lock);
2109        return domain;
2110}
2111
2112/**
2113 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
2114 *
2115 * @file: Pointer to "struct file".
2116 * @wait: Pointer to "poll_table".
2117 *
2118 * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
2119 *
2120 * Waits for access requests which violated policy in enforcing mode.
2121 */
2122static unsigned int tomoyo_poll_query(struct file *file, poll_table *wait)
2123{
2124        if (!list_empty(&tomoyo_query_list))
2125                return POLLIN | POLLRDNORM;
2126        poll_wait(file, &tomoyo_query_wait, wait);
2127        if (!list_empty(&tomoyo_query_list))
2128                return POLLIN | POLLRDNORM;
2129        return 0;
2130}
2131
2132/**
2133 * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
2134 *
2135 * @head: Pointer to "struct tomoyo_io_buffer".
2136 */
2137static void tomoyo_read_query(struct tomoyo_io_buffer *head)
2138{
2139        struct list_head *tmp;
2140        unsigned int pos = 0;
2141        size_t len = 0;
2142        char *buf;
2143        if (head->r.w_pos)
2144                return;
2145        if (head->read_buf) {
2146                kfree(head->read_buf);
2147                head->read_buf = NULL;
2148        }
2149        spin_lock(&tomoyo_query_list_lock);
2150        list_for_each(tmp, &tomoyo_query_list) {
2151                struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2152                if (pos++ != head->r.query_index)
2153                        continue;
2154                len = ptr->query_len;
2155                break;
2156        }
2157        spin_unlock(&tomoyo_query_list_lock);
2158        if (!len) {
2159                head->r.query_index = 0;
2160                return;
2161        }
2162        buf = kzalloc(len + 32, GFP_NOFS);
2163        if (!buf)
2164                return;
2165        pos = 0;
2166        spin_lock(&tomoyo_query_list_lock);
2167        list_for_each(tmp, &tomoyo_query_list) {
2168                struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2169                if (pos++ != head->r.query_index)
2170                        continue;
2171                /*
2172                 * Some query can be skipped because tomoyo_query_list
2173                 * can change, but I don't care.
2174                 */
2175                if (len == ptr->query_len)
2176                        snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
2177                                 ptr->retry, ptr->query);
2178                break;
2179        }
2180        spin_unlock(&tomoyo_query_list_lock);
2181        if (buf[0]) {
2182                head->read_buf = buf;
2183                head->r.w[head->r.w_pos++] = buf;
2184                head->r.query_index++;
2185        } else {
2186                kfree(buf);
2187        }
2188}
2189
2190/**
2191 * tomoyo_write_answer - Write the supervisor's decision.
2192 *
2193 * @head: Pointer to "struct tomoyo_io_buffer".
2194 *
2195 * Returns 0 on success, -EINVAL otherwise.
2196 */
2197static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
2198{
2199        char *data = head->write_buf;
2200        struct list_head *tmp;
2201        unsigned int serial;
2202        unsigned int answer;
2203        spin_lock(&tomoyo_query_list_lock);
2204        list_for_each(tmp, &tomoyo_query_list) {
2205                struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2206                ptr->timer = 0;
2207        }
2208        spin_unlock(&tomoyo_query_list_lock);
2209        if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
2210                return -EINVAL;
2211        spin_lock(&tomoyo_query_list_lock);
2212        list_for_each(tmp, &tomoyo_query_list) {
2213                struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2214                if (ptr->serial != serial)
2215                        continue;
2216                ptr->answer = answer;
2217                /* Remove from tomoyo_query_list. */
2218                if (ptr->answer)
2219                        list_del_init(&ptr->list);
2220                break;
2221        }
2222        spin_unlock(&tomoyo_query_list_lock);
2223        return 0;
2224}
2225
2226/**
2227 * tomoyo_read_version: Get version.
2228 *
2229 * @head: Pointer to "struct tomoyo_io_buffer".
2230 *
2231 * Returns version information.
2232 */
2233static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2234{
2235        if (!head->r.eof) {
2236                tomoyo_io_printf(head, "2.5.0");
2237                head->r.eof = true;
2238        }
2239}
2240
2241/* String table for /sys/kernel/security/tomoyo/stat interface. */
2242static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2243        [TOMOYO_STAT_POLICY_UPDATES]    = "update:",
2244        [TOMOYO_STAT_POLICY_LEARNING]   = "violation in learning mode:",
2245        [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2246        [TOMOYO_STAT_POLICY_ENFORCING]  = "violation in enforcing mode:",
2247};
2248
2249/* String table for /sys/kernel/security/tomoyo/stat interface. */
2250static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2251        [TOMOYO_MEMORY_POLICY] = "policy:",
2252        [TOMOYO_MEMORY_AUDIT]  = "audit log:",
2253        [TOMOYO_MEMORY_QUERY]  = "query message:",
2254};
2255
2256/* Timestamp counter for last updated. */
2257static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2258/* Counter for number of updates. */
2259static unsigned int tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2260
2261/**
2262 * tomoyo_update_stat - Update statistic counters.
2263 *
2264 * @index: Index for policy type.
2265 *
2266 * Returns nothing.
2267 */
2268void tomoyo_update_stat(const u8 index)
2269{
2270        struct timeval tv;
2271        do_gettimeofday(&tv);
2272        /*
2273         * I don't use atomic operations because race condition is not fatal.
2274         */
2275        tomoyo_stat_updated[index]++;
2276        tomoyo_stat_modified[index] = tv.tv_sec;
2277}
2278
2279/**
2280 * tomoyo_read_stat - Read statistic data.
2281 *
2282 * @head: Pointer to "struct tomoyo_io_buffer".
2283 *
2284 * Returns nothing.
2285 */
2286static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2287{
2288        u8 i;
2289        unsigned int total = 0;
2290        if (head->r.eof)
2291                return;
2292        for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2293                tomoyo_io_printf(head, "Policy %-30s %10u",
2294                                 tomoyo_policy_headers[i],
2295                                 tomoyo_stat_updated[i]);
2296                if (tomoyo_stat_modified[i]) {
2297                        struct tomoyo_time stamp;
2298                        tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2299                        tomoyo_io_printf(head, " (Last: %04u/%02u/%02u "
2300                                         "%02u:%02u:%02u)",
2301                                         stamp.year, stamp.month, stamp.day,
2302                                         stamp.hour, stamp.min, stamp.sec);
2303                }
2304                tomoyo_set_lf(head);
2305        }
2306        for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2307                unsigned int used = tomoyo_memory_used[i];
2308                total += used;
2309                tomoyo_io_printf(head, "Memory used by %-22s %10u",
2310                                 tomoyo_memory_headers[i], used);
2311                used = tomoyo_memory_quota[i];
2312                if (used)
2313                        tomoyo_io_printf(head, " (Quota: %10u)", used);
2314                tomoyo_set_lf(head);
2315        }
2316        tomoyo_io_printf(head, "Total memory used:                    %10u\n",
2317                         total);
2318        head->r.eof = true;
2319}
2320
2321/**
2322 * tomoyo_write_stat - Set memory quota.
2323 *
2324 * @head: Pointer to "struct tomoyo_io_buffer".
2325 *
2326 * Returns 0.
2327 */
2328static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2329{
2330        char *data = head->write_buf;
2331        u8 i;
2332        if (tomoyo_str_starts(&data, "Memory used by "))
2333                for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2334                        if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2335                                sscanf(data, "%u", &tomoyo_memory_quota[i]);
2336        return 0;
2337}
2338
2339/**
2340 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2341 *
2342 * @type: Type of interface.
2343 * @file: Pointer to "struct file".
2344 *
2345 * Returns 0 on success, negative value otherwise.
2346 */
2347int tomoyo_open_control(const u8 type, struct file *file)
2348{
2349        struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2350
2351        if (!head)
2352                return -ENOMEM;
2353        mutex_init(&head->io_sem);
2354        head->type = type;
2355        switch (type) {
2356        case TOMOYO_DOMAINPOLICY:
2357                /* /sys/kernel/security/tomoyo/domain_policy */
2358                head->write = tomoyo_write_domain;
2359                head->read = tomoyo_read_domain;
2360                break;
2361        case TOMOYO_EXCEPTIONPOLICY:
2362                /* /sys/kernel/security/tomoyo/exception_policy */
2363                head->write = tomoyo_write_exception;
2364                head->read = tomoyo_read_exception;
2365                break;
2366        case TOMOYO_AUDIT:
2367                /* /sys/kernel/security/tomoyo/audit */
2368                head->poll = tomoyo_poll_log;
2369                head->read = tomoyo_read_log;
2370                break;
2371        case TOMOYO_PROCESS_STATUS:
2372                /* /sys/kernel/security/tomoyo/.process_status */
2373                head->write = tomoyo_write_pid;
2374                head->read = tomoyo_read_pid;
2375                break;
2376        case TOMOYO_VERSION:
2377                /* /sys/kernel/security/tomoyo/version */
2378                head->read = tomoyo_read_version;
2379                head->readbuf_size = 128;
2380                break;
2381        case TOMOYO_STAT:
2382                /* /sys/kernel/security/tomoyo/stat */
2383                head->write = tomoyo_write_stat;
2384                head->read = tomoyo_read_stat;
2385                head->readbuf_size = 1024;
2386                break;
2387        case TOMOYO_PROFILE:
2388                /* /sys/kernel/security/tomoyo/profile */
2389                head->write = tomoyo_write_profile;
2390                head->read = tomoyo_read_profile;
2391                break;
2392        case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2393                head->poll = tomoyo_poll_query;
2394                head->write = tomoyo_write_answer;
2395                head->read = tomoyo_read_query;
2396                break;
2397        case TOMOYO_MANAGER:
2398                /* /sys/kernel/security/tomoyo/manager */
2399                head->write = tomoyo_write_manager;
2400                head->read = tomoyo_read_manager;
2401                break;
2402        }
2403        if (!(file->f_mode & FMODE_READ)) {
2404                /*
2405                 * No need to allocate read_buf since it is not opened
2406                 * for reading.
2407                 */
2408                head->read = NULL;
2409                head->poll = NULL;
2410        } else if (!head->poll) {
2411                /* Don't allocate read_buf for poll() access. */
2412                if (!head->readbuf_size)
2413                        head->readbuf_size = 4096 * 2;
2414                head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2415                if (!head->read_buf) {
2416                        kfree(head);
2417                        return -ENOMEM;
2418                }
2419        }
2420        if (!(file->f_mode & FMODE_WRITE)) {
2421                /*
2422                 * No need to allocate write_buf since it is not opened
2423                 * for writing.
2424                 */
2425                head->write = NULL;
2426        } else if (head->write) {
2427                head->writebuf_size = 4096 * 2;
2428                head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2429                if (!head->write_buf) {
2430                        kfree(head->read_buf);
2431                        kfree(head);
2432                        return -ENOMEM;
2433                }
2434        }
2435        /*
2436         * If the file is /sys/kernel/security/tomoyo/query , increment the
2437         * observer counter.
2438         * The obserber counter is used by tomoyo_supervisor() to see if
2439         * there is some process monitoring /sys/kernel/security/tomoyo/query.
2440         */
2441        if (type == TOMOYO_QUERY)
2442                atomic_inc(&tomoyo_query_observers);
2443        file->private_data = head;
2444        tomoyo_notify_gc(head, true);
2445        return 0;
2446}
2447
2448/**
2449 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2450 *
2451 * @file: Pointer to "struct file".
2452 * @wait: Pointer to "poll_table". Maybe NULL.
2453 *
2454 * Returns POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM if ready to read/write,
2455 * POLLOUT | POLLWRNORM otherwise.
2456 */
2457unsigned int tomoyo_poll_control(struct file *file, poll_table *wait)
2458{
2459        struct tomoyo_io_buffer *head = file->private_data;
2460        if (head->poll)
2461                return head->poll(file, wait) | POLLOUT | POLLWRNORM;
2462        return POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM;
2463}
2464
2465/**
2466 * tomoyo_set_namespace_cursor - Set namespace to read.
2467 *
2468 * @head: Pointer to "struct tomoyo_io_buffer".
2469 *
2470 * Returns nothing.
2471 */
2472static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2473{
2474        struct list_head *ns;
2475        if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2476            head->type != TOMOYO_PROFILE)
2477                return;
2478        /*
2479         * If this is the first read, or reading previous namespace finished
2480         * and has more namespaces to read, update the namespace cursor.
2481         */
2482        ns = head->r.ns;
2483        if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2484                /* Clearing is OK because tomoyo_flush() returned true. */
2485                memset(&head->r, 0, sizeof(head->r));
2486                head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2487        }
2488}
2489
2490/**
2491 * tomoyo_has_more_namespace - Check for unread namespaces.
2492 *
2493 * @head: Pointer to "struct tomoyo_io_buffer".
2494 *
2495 * Returns true if we have more entries to print, false otherwise.
2496 */
2497static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2498{
2499        return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2500                head->type == TOMOYO_PROFILE) && head->r.eof &&
2501                head->r.ns->next != &tomoyo_namespace_list;
2502}
2503
2504/**
2505 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2506 *
2507 * @head:       Pointer to "struct tomoyo_io_buffer".
2508 * @buffer:     Poiner to buffer to write to.
2509 * @buffer_len: Size of @buffer.
2510 *
2511 * Returns bytes read on success, negative value otherwise.
2512 */
2513ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2514                            const int buffer_len)
2515{
2516        int len;
2517        int idx;
2518
2519        if (!head->read)
2520                return -ENOSYS;
2521        if (mutex_lock_interruptible(&head->io_sem))
2522                return -EINTR;
2523        head->read_user_buf = buffer;
2524        head->read_user_buf_avail = buffer_len;
2525        idx = tomoyo_read_lock();
2526        if (tomoyo_flush(head))
2527                /* Call the policy handler. */
2528                do {
2529                        tomoyo_set_namespace_cursor(head);
2530                        head->read(head);
2531                } while (tomoyo_flush(head) &&
2532                         tomoyo_has_more_namespace(head));
2533        tomoyo_read_unlock(idx);
2534        len = head->read_user_buf - buffer;
2535        mutex_unlock(&head->io_sem);
2536        return len;
2537}
2538
2539/**
2540 * tomoyo_parse_policy - Parse a policy line.
2541 *
2542 * @head: Poiter to "struct tomoyo_io_buffer".
2543 * @line: Line to parse.
2544 *
2545 * Returns 0 on success, negative value otherwise.
2546 *
2547 * Caller holds tomoyo_read_lock().
2548 */
2549static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2550{
2551        /* Delete request? */
2552        head->w.is_delete = !strncmp(line, "delete ", 7);
2553        if (head->w.is_delete)
2554                memmove(line, line + 7, strlen(line + 7) + 1);
2555        /* Selecting namespace to update. */
2556        if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2557            head->type == TOMOYO_PROFILE) {
2558                if (*line == '<') {
2559                        char *cp = strchr(line, ' ');
2560                        if (cp) {
2561                                *cp++ = '\0';
2562                                head->w.ns = tomoyo_assign_namespace(line);
2563                                memmove(line, cp, strlen(cp) + 1);
2564                        } else
2565                                head->w.ns = NULL;
2566                } else
2567                        head->w.ns = &tomoyo_kernel_namespace;
2568                /* Don't allow updating if namespace is invalid. */
2569                if (!head->w.ns)
2570                        return -ENOENT;
2571        }
2572        /* Do the update. */
2573        return head->write(head);
2574}
2575
2576/**
2577 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2578 *
2579 * @head:       Pointer to "struct tomoyo_io_buffer".
2580 * @buffer:     Pointer to buffer to read from.
2581 * @buffer_len: Size of @buffer.
2582 *
2583 * Returns @buffer_len on success, negative value otherwise.
2584 */
2585ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2586                             const char __user *buffer, const int buffer_len)
2587{
2588        int error = buffer_len;
2589        size_t avail_len = buffer_len;
2590        char *cp0 = head->write_buf;
2591        int idx;
2592        if (!head->write)
2593                return -ENOSYS;
2594        if (!access_ok(VERIFY_READ, buffer, buffer_len))
2595                return -EFAULT;
2596        if (mutex_lock_interruptible(&head->io_sem))
2597                return -EINTR;
2598        head->read_user_buf_avail = 0;
2599        idx = tomoyo_read_lock();
2600        /* Read a line and dispatch it to the policy handler. */
2601        while (avail_len > 0) {
2602                char c;
2603                if (head->w.avail >= head->writebuf_size - 1) {
2604                        const int len = head->writebuf_size * 2;
2605                        char *cp = kzalloc(len, GFP_NOFS);
2606                        if (!cp) {
2607                                error = -ENOMEM;
2608                                break;
2609                        }
2610                        memmove(cp, cp0, head->w.avail);
2611                        kfree(cp0);
2612                        head->write_buf = cp;
2613                        cp0 = cp;
2614                        head->writebuf_size = len;
2615                }
2616                if (get_user(c, buffer)) {
2617                        error = -EFAULT;
2618                        break;
2619                }
2620                buffer++;
2621                avail_len--;
2622                cp0[head->w.avail++] = c;
2623                if (c != '\n')
2624                        continue;
2625                cp0[head->w.avail - 1] = '\0';
2626                head->w.avail = 0;
2627                tomoyo_normalize_line(cp0);
2628                if (!strcmp(cp0, "reset")) {
2629                        head->w.ns = &tomoyo_kernel_namespace;
2630                        head->w.domain = NULL;
2631                        memset(&head->r, 0, sizeof(head->r));
2632                        continue;
2633                }
2634                /* Don't allow updating policies by non manager programs. */
2635                switch (head->type) {
2636                case TOMOYO_PROCESS_STATUS:
2637                        /* This does not write anything. */
2638                        break;
2639                case TOMOYO_DOMAINPOLICY:
2640                        if (tomoyo_select_domain(head, cp0))
2641                                continue;
2642                        /* fall through */
2643                case TOMOYO_EXCEPTIONPOLICY:
2644                        if (!strcmp(cp0, "select transition_only")) {
2645                                head->r.print_transition_related_only = true;
2646                                continue;
2647                        }
2648                        /* fall through */
2649                default:
2650                        if (!tomoyo_manager()) {
2651                                error = -EPERM;
2652                                goto out;
2653                        }
2654                }
2655                switch (tomoyo_parse_policy(head, cp0)) {
2656                case -EPERM:
2657                        error = -EPERM;
2658                        goto out;
2659                case 0:
2660                        switch (head->type) {
2661                        case TOMOYO_DOMAINPOLICY:
2662                        case TOMOYO_EXCEPTIONPOLICY:
2663                        case TOMOYO_STAT:
2664                        case TOMOYO_PROFILE:
2665                        case TOMOYO_MANAGER:
2666                                tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2667                                break;
2668                        default:
2669                                break;
2670                        }
2671                        break;
2672                }
2673        }
2674out:
2675        tomoyo_read_unlock(idx);
2676        mutex_unlock(&head->io_sem);
2677        return error;
2678}
2679
2680/**
2681 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2682 *
2683 * @head: Pointer to "struct tomoyo_io_buffer".
2684 *
2685 * Returns 0.
2686 */
2687int tomoyo_close_control(struct tomoyo_io_buffer *head)
2688{
2689        /*
2690         * If the file is /sys/kernel/security/tomoyo/query , decrement the
2691         * observer counter.
2692         */
2693        if (head->type == TOMOYO_QUERY &&
2694            atomic_dec_and_test(&tomoyo_query_observers))
2695                wake_up_all(&tomoyo_answer_wait);
2696        tomoyo_notify_gc(head, false);
2697        return 0;
2698}
2699
2700/**
2701 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2702 */
2703void tomoyo_check_profile(void)
2704{
2705        struct tomoyo_domain_info *domain;
2706        const int idx = tomoyo_read_lock();
2707        tomoyo_policy_loaded = true;
2708        printk(KERN_INFO "TOMOYO: 2.5.0\n");
2709        list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2710                const u8 profile = domain->profile;
2711                const struct tomoyo_policy_namespace *ns = domain->ns;
2712                if (ns->profile_version != 20110903)
2713                        printk(KERN_ERR
2714                               "Profile version %u is not supported.\n",
2715                               ns->profile_version);
2716                else if (!ns->profile_ptr[profile])
2717                        printk(KERN_ERR
2718                               "Profile %u (used by '%s') is not defined.\n",
2719                               profile, domain->domainname->name);
2720                else
2721                        continue;
2722                printk(KERN_ERR
2723                       "Userland tools for TOMOYO 2.5 must be installed and "
2724                       "policy must be initialized.\n");
2725                printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.5/ "
2726                       "for more information.\n");
2727                panic("STOP!");
2728        }
2729        tomoyo_read_unlock(idx);
2730        printk(KERN_INFO "Mandatory Access Control activated.\n");
2731}
2732
2733/**
2734 * tomoyo_load_builtin_policy - Load built-in policy.
2735 *
2736 * Returns nothing.
2737 */
2738void __init tomoyo_load_builtin_policy(void)
2739{
2740        /*
2741         * This include file is manually created and contains built-in policy
2742         * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2743         * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2744         * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2745         */
2746#include "builtin-policy.h"
2747        u8 i;
2748        const int idx = tomoyo_read_lock();
2749        for (i = 0; i < 5; i++) {
2750                struct tomoyo_io_buffer head = { };
2751                char *start = "";
2752                switch (i) {
2753                case 0:
2754                        start = tomoyo_builtin_profile;
2755                        head.type = TOMOYO_PROFILE;
2756                        head.write = tomoyo_write_profile;
2757                        break;
2758                case 1:
2759                        start = tomoyo_builtin_exception_policy;
2760                        head.type = TOMOYO_EXCEPTIONPOLICY;
2761                        head.write = tomoyo_write_exception;
2762                        break;
2763                case 2:
2764                        start = tomoyo_builtin_domain_policy;
2765                        head.type = TOMOYO_DOMAINPOLICY;
2766                        head.write = tomoyo_write_domain;
2767                        break;
2768                case 3:
2769                        start = tomoyo_builtin_manager;
2770                        head.type = TOMOYO_MANAGER;
2771                        head.write = tomoyo_write_manager;
2772                        break;
2773                case 4:
2774                        start = tomoyo_builtin_stat;
2775                        head.type = TOMOYO_STAT;
2776                        head.write = tomoyo_write_stat;
2777                        break;
2778                }
2779                while (1) {
2780                        char *end = strchr(start, '\n');
2781                        if (!end)
2782                                break;
2783                        *end = '\0';
2784                        tomoyo_normalize_line(start);
2785                        head.write_buf = start;
2786                        tomoyo_parse_policy(&head, start);
2787                        start = end + 1;
2788                }
2789        }
2790        tomoyo_read_unlock(idx);
2791#ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2792        tomoyo_check_profile();
2793#endif
2794}
2795
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