security/tomoyo/common.c

   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. */
  13 const 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 */
  21 const 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. */
  72 const 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. */
 135 static 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. */
 141 const 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. */
 156 const 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. */
 164 static 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? */
 172 static 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  */
 181 const 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  */
 195 static 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  */
 211 static 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  */
 256 static 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
 265 static 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  */
 274 static 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  */
 301 static 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  */
 313 static 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  */
 326 static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
 327 {
 328         tomoyo_set_string(head, "/");
 329 }
 330
 331 /* List of namespaces. */
 332 LIST_HEAD(tomoyo_namespace_list);
 333 /* True if namespace other than tomoyo_kernel_namespace is defined. */
 334 static 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  */
 343 void 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  */
 364 static 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  */
 381 static 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  */
 401 static 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  */
 422 static 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  */
 469 static 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  */
 484 static 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  */
 527 struct 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  */
 545 static 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  */
 567 static 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  */
 584 static 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  */
 660 static 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  */
 713 static 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  */
 728 static 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  */
 825 static 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  */
 842 static 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_domain_def(manager)) {
 854                 if (!tomoyo_correct_domain(manager))
 855                         return -EINVAL;
 856                 e.is_domain = true;
 857         } else {
 858                 if (!tomoyo_correct_path(manager))
 859                         return -EINVAL;
 860         }
 861         e.manager = tomoyo_get_name(manager);
 862         if (e.manager) {
 863                 error = tomoyo_update_policy(&e.head, sizeof(e), &param,
 864                                              tomoyo_same_manager);
 865                 tomoyo_put_name(e.manager);
 866         }
 867         return error;
 868 }
 869
 870 /**
 871  * tomoyo_write_manager - Write manager policy.
 872  *
 873  * @head: Pointer to "struct tomoyo_io_buffer".
 874  *
 875  * Returns 0 on success, negative value otherwise.
 876  *
 877  * Caller holds tomoyo_read_lock().
 878  */
 879 static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
 880 {
 881         char *data = head->write_buf;
 882
 883         if (!strcmp(data, "manage_by_non_root")) {
 884                 tomoyo_manage_by_non_root = !head->w.is_delete;
 885                 return 0;
 886         }
 887         return tomoyo_update_manager_entry(data, head->w.is_delete);
 888 }
 889
 890 /**
 891  * tomoyo_read_manager - Read manager policy.
 892  *
 893  * @head: Pointer to "struct tomoyo_io_buffer".
 894  *
 895  * Caller holds tomoyo_read_lock().
 896  */
 897 static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
 898 {
 899         if (head->r.eof)
 900                 return;
 901         list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.
 902                              policy_list[TOMOYO_ID_MANAGER]) {
 903                 struct tomoyo_manager *ptr =
 904                         list_entry(head->r.acl, typeof(*ptr), head.list);
 905                 if (ptr->head.is_deleted)
 906                         continue;
 907                 if (!tomoyo_flush(head))
 908                         return;
 909                 tomoyo_set_string(head, ptr->manager->name);
 910                 tomoyo_set_lf(head);
 911         }
 912         head->r.eof = true;
 913 }
 914
 915 /**
 916  * tomoyo_manager - Check whether the current process is a policy manager.
 917  *
 918  * Returns true if the current process is permitted to modify policy
 919  * via /sys/kernel/security/tomoyo/ interface.
 920  *
 921  * Caller holds tomoyo_read_lock().
 922  */
 923 static bool tomoyo_manager(void)
 924 {
 925         struct tomoyo_manager *ptr;
 926         const char *exe;
 927         const struct task_struct *task = current;
 928         const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
 929         bool found = false;
 930
 931         if (!tomoyo_policy_loaded)
 932                 return true;
 933         if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
 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 && ptr->is_domain
 938                     && !tomoyo_pathcmp(domainname, ptr->manager)) {
 939                         found = true;
 940                         break;
 941                 }
 942         }
 943         if (found)
 944                 return true;
 945         exe = tomoyo_get_exe();
 946         if (!exe)
 947                 return false;
 948         list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
 949                                 policy_list[TOMOYO_ID_MANAGER], head.list) {
 950                 if (!ptr->head.is_deleted && !ptr->is_domain
 951                     && !strcmp(exe, ptr->manager->name)) {
 952                         found = true;
 953                         break;
 954                 }
 955         }
 956         if (!found) { /* Reduce error messages. */
 957                 static pid_t last_pid;
 958                 const pid_t pid = current->pid;
 959                 if (last_pid != pid) {
 960                         printk(KERN_WARNING "%s ( %s ) is not permitted to "
 961                                "update policies.\n", domainname->name, exe);
 962                         last_pid = pid;
 963                 }
 964         }
 965         kfree(exe);
 966         return found;
 967 }
 968
 969 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
 970 (unsigned int serial);
 971
 972 /**
 973  * tomoyo_select_domain - Parse select command.
 974  *
 975  * @head: Pointer to "struct tomoyo_io_buffer".
 976  * @data: String to parse.
 977  *
 978  * Returns true on success, false otherwise.
 979  *
 980  * Caller holds tomoyo_read_lock().
 981  */
 982 static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
 983                                  const char *data)
 984 {
 985         unsigned int pid;
 986         struct tomoyo_domain_info *domain = NULL;
 987         bool global_pid = false;
 988         if (strncmp(data, "select ", 7))
 989                 return false;
 990         data += 7;
 991         if (sscanf(data, "pid=%u", &pid) == 1 ||
 992             (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
 993                 struct task_struct *p;
 994                 rcu_read_lock();
 995                 if (global_pid)
 996                         p = find_task_by_pid_ns(pid, &init_pid_ns);
 997                 else
 998                         p = find_task_by_vpid(pid);
 999                 if (p)
1000                         domain = tomoyo_real_domain(p);
1001                 rcu_read_unlock();
1002         } else if (!strncmp(data, "domain=", 7)) {
1003                 if (tomoyo_domain_def(data + 7))
1004                         domain = tomoyo_find_domain(data + 7);
1005         } else if (sscanf(data, "Q=%u", &pid) == 1) {
1006                 domain = tomoyo_find_domain_by_qid(pid);
1007         } else
1008                 return false;
1009         head->w.domain = domain;
1010         /* Accessing read_buf is safe because head->io_sem is held. */
1011         if (!head->read_buf)
1012                 return true; /* Do nothing if open(O_WRONLY). */
1013         memset(&head->r, 0, sizeof(head->r));
1014         head->r.print_this_domain_only = true;
1015         if (domain)
1016                 head->r.domain = &domain->list;
1017         else
1018                 head->r.eof = 1;
1019         tomoyo_io_printf(head, "# select %s\n", data);
1020         if (domain && domain->is_deleted)
1021                 tomoyo_io_printf(head, "# This is a deleted domain.\n");
1022         return true;
1023 }
1024
1025 /**
1026  * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry.
1027  *
1028  * @a: Pointer to "struct tomoyo_acl_info".
1029  * @b: Pointer to "struct tomoyo_acl_info".
1030  *
1031  * Returns true if @a == @b, false otherwise.
1032  */
1033 static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a,
1034                               const struct tomoyo_acl_info *b)
1035 {
1036         const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head);
1037         const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head);
1038         return p1->domainname == p2->domainname;
1039 }
1040
1041 /**
1042  * tomoyo_write_task - Update task related list.
1043  *
1044  * @param: Pointer to "struct tomoyo_acl_param".
1045  *
1046  * Returns 0 on success, negative value otherwise.
1047  *
1048  * Caller holds tomoyo_read_lock().
1049  */
1050 static int tomoyo_write_task(struct tomoyo_acl_param *param)
1051 {
1052         int error = -EINVAL;
1053         if (tomoyo_str_starts(&param->data, "manual_domain_transition ")) {
1054                 struct tomoyo_task_acl e = {
1055                         .head.type = TOMOYO_TYPE_MANUAL_TASK_ACL,
1056                         .domainname = tomoyo_get_domainname(param),
1057                 };
1058                 if (e.domainname)
1059                         error = tomoyo_update_domain(&e.head, sizeof(e), param,
1060                                                      tomoyo_same_task_acl,
1061                                                      NULL);
1062                 tomoyo_put_name(e.domainname);
1063         }
1064         return error;
1065 }
1066
1067 /**
1068  * tomoyo_delete_domain - Delete a domain.
1069  *
1070  * @domainname: The name of domain.
1071  *
1072  * Returns 0.
1073  *
1074  * Caller holds tomoyo_read_lock().
1075  */
1076 static int tomoyo_delete_domain(char *domainname)
1077 {
1078         struct tomoyo_domain_info *domain;
1079         struct tomoyo_path_info name;
1080
1081         name.name = domainname;
1082         tomoyo_fill_path_info(&name);
1083         if (mutex_lock_interruptible(&tomoyo_policy_lock))
1084                 return 0;
1085         /* Is there an active domain? */
1086         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1087                 /* Never delete tomoyo_kernel_domain */
1088                 if (domain == &tomoyo_kernel_domain)
1089                         continue;
1090                 if (domain->is_deleted ||
1091                     tomoyo_pathcmp(domain->domainname, &name))
1092                         continue;
1093                 domain->is_deleted = true;
1094                 break;
1095         }
1096         mutex_unlock(&tomoyo_policy_lock);
1097         return 0;
1098 }
1099
1100 /**
1101  * tomoyo_write_domain2 - Write domain policy.
1102  *
1103  * @ns:        Pointer to "struct tomoyo_policy_namespace".
1104  * @list:      Pointer to "struct list_head".
1105  * @data:      Policy to be interpreted.
1106  * @is_delete: True if it is a delete request.
1107  *
1108  * Returns 0 on success, negative value otherwise.
1109  *
1110  * Caller holds tomoyo_read_lock().
1111  */
1112 static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
1113                                 struct list_head *list, char *data,
1114                                 const bool is_delete)
1115 {
1116         struct tomoyo_acl_param param = {
1117                 .ns = ns,
1118                 .list = list,
1119                 .data = data,
1120                 .is_delete = is_delete,
1121         };
1122         static const struct {
1123                 const char *keyword;
1124                 int (*write) (struct tomoyo_acl_param *);
1125         } tomoyo_callback[5] = {
1126                 { "file ", tomoyo_write_file },
1127                 { "network inet ", tomoyo_write_inet_network },
1128                 { "network unix ", tomoyo_write_unix_network },
1129                 { "misc ", tomoyo_write_misc },
1130                 { "task ", tomoyo_write_task },
1131         };
1132         u8 i;
1133
1134         for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) {
1135                 if (!tomoyo_str_starts(&param.data,
1136                                        tomoyo_callback[i].keyword))
1137                         continue;
1138                 return tomoyo_callback[i].write(&param);
1139         }
1140         return -EINVAL;
1141 }
1142
1143 /* String table for domain flags. */
1144 const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1145         [TOMOYO_DIF_QUOTA_WARNED]      = "quota_exceeded\n",
1146         [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1147 };
1148
1149 /**
1150  * tomoyo_write_domain - Write domain policy.
1151  *
1152  * @head: Pointer to "struct tomoyo_io_buffer".
1153  *
1154  * Returns 0 on success, negative value otherwise.
1155  *
1156  * Caller holds tomoyo_read_lock().
1157  */
1158 static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1159 {
1160         char *data = head->write_buf;
1161         struct tomoyo_policy_namespace *ns;
1162         struct tomoyo_domain_info *domain = head->w.domain;
1163         const bool is_delete = head->w.is_delete;
1164         bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1165         unsigned int profile;
1166         if (*data == '<') {
1167                 domain = NULL;
1168                 if (is_delete)
1169                         tomoyo_delete_domain(data);
1170                 else if (is_select)
1171                         domain = tomoyo_find_domain(data);
1172                 else
1173                         domain = tomoyo_assign_domain(data, false);
1174                 head->w.domain = domain;
1175                 return 0;
1176         }
1177         if (!domain)
1178                 return -EINVAL;
1179         ns = domain->ns;
1180         if (sscanf(data, "use_profile %u", &profile) == 1
1181             && profile < TOMOYO_MAX_PROFILES) {
1182                 if (!tomoyo_policy_loaded || ns->profile_ptr[profile])
1183                         domain->profile = (u8) profile;
1184                 return 0;
1185         }
1186         if (sscanf(data, "use_group %u\n", &profile) == 1
1187             && profile < TOMOYO_MAX_ACL_GROUPS) {
1188                 if (!is_delete)
1189                         domain->group = (u8) profile;
1190                 return 0;
1191         }
1192         for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) {
1193                 const char *cp = tomoyo_dif[profile];
1194                 if (strncmp(data, cp, strlen(cp) - 1))
1195                         continue;
1196                 domain->flags[profile] = !is_delete;
1197                 return 0;
1198         }
1199         return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1200                                     is_delete);
1201 }
1202
1203 /**
1204  * tomoyo_print_condition - Print condition part.
1205  *
1206  * @head: Pointer to "struct tomoyo_io_buffer".
1207  * @cond: Pointer to "struct tomoyo_condition".
1208  *
1209  * Returns true on success, false otherwise.
1210  */
1211 static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1212                                    const struct tomoyo_condition *cond)
1213 {
1214         switch (head->r.cond_step) {
1215         case 0:
1216                 head->r.cond_index = 0;
1217                 head->r.cond_step++;
1218                 if (cond->transit) {
1219                         tomoyo_set_space(head);
1220                         tomoyo_set_string(head, cond->transit->name);
1221                 }
1222                 /* fall through */
1223         case 1:
1224                 {
1225                         const u16 condc = cond->condc;
1226                         const struct tomoyo_condition_element *condp =
1227                                 (typeof(condp)) (cond + 1);
1228                         const struct tomoyo_number_union *numbers_p =
1229                                 (typeof(numbers_p)) (condp + condc);
1230                         const struct tomoyo_name_union *names_p =
1231                                 (typeof(names_p))
1232                                 (numbers_p + cond->numbers_count);
1233                         const struct tomoyo_argv *argv =
1234                                 (typeof(argv)) (names_p + cond->names_count);
1235                         const struct tomoyo_envp *envp =
1236                                 (typeof(envp)) (argv + cond->argc);
1237                         u16 skip;
1238                         for (skip = 0; skip < head->r.cond_index; skip++) {
1239                                 const u8 left = condp->left;
1240                                 const u8 right = condp->right;
1241                                 condp++;
1242                                 switch (left) {
1243                                 case TOMOYO_ARGV_ENTRY:
1244                                         argv++;
1245                                         continue;
1246                                 case TOMOYO_ENVP_ENTRY:
1247                                         envp++;
1248                                         continue;
1249                                 case TOMOYO_NUMBER_UNION:
1250                                         numbers_p++;
1251                                         break;
1252                                 }
1253                                 switch (right) {
1254                                 case TOMOYO_NAME_UNION:
1255                                         names_p++;
1256                                         break;
1257                                 case TOMOYO_NUMBER_UNION:
1258                                         numbers_p++;
1259                                         break;
1260                                 }
1261                         }
1262                         while (head->r.cond_index < condc) {
1263                                 const u8 match = condp->equals;
1264                                 const u8 left = condp->left;
1265                                 const u8 right = condp->right;
1266                                 if (!tomoyo_flush(head))
1267                                         return false;
1268                                 condp++;
1269                                 head->r.cond_index++;
1270                                 tomoyo_set_space(head);
1271                                 switch (left) {
1272                                 case TOMOYO_ARGV_ENTRY:
1273                                         tomoyo_io_printf(head,
1274                                                          "exec.argv[%lu]%s=\"",
1275                                                          argv->index, argv->
1276                                                          is_not ? "!" : "");
1277                                         tomoyo_set_string(head,
1278                                                           argv->value->name);
1279                                         tomoyo_set_string(head, "\"");
1280                                         argv++;
1281                                         continue;
1282                                 case TOMOYO_ENVP_ENTRY:
1283                                         tomoyo_set_string(head,
1284                                                           "exec.envp[\"");
1285                                         tomoyo_set_string(head,
1286                                                           envp->name->name);
1287                                         tomoyo_io_printf(head, "\"]%s=", envp->
1288                                                          is_not ? "!" : "");
1289                                         if (envp->value) {
1290                                                 tomoyo_set_string(head, "\"");
1291                                                 tomoyo_set_string(head, envp->
1292                                                                   value->name);
1293                                                 tomoyo_set_string(head, "\"");
1294                                         } else {
1295                                                 tomoyo_set_string(head,
1296                                                                   "NULL");
1297                                         }
1298                                         envp++;
1299                                         continue;
1300                                 case TOMOYO_NUMBER_UNION:
1301                                         tomoyo_print_number_union_nospace
1302                                                 (head, numbers_p++);
1303                                         break;
1304                                 default:
1305                                         tomoyo_set_string(head,
1306                                                tomoyo_condition_keyword[left]);
1307                                         break;
1308                                 }
1309                                 tomoyo_set_string(head, match ? "=" : "!=");
1310                                 switch (right) {
1311                                 case TOMOYO_NAME_UNION:
1312                                         tomoyo_print_name_union_quoted
1313                                                 (head, names_p++);
1314                                         break;
1315                                 case TOMOYO_NUMBER_UNION:
1316                                         tomoyo_print_number_union_nospace
1317                                                 (head, numbers_p++);
1318                                         break;
1319                                 default:
1320                                         tomoyo_set_string(head,
1321                                           tomoyo_condition_keyword[right]);
1322                                         break;
1323                                 }
1324                         }
1325                 }
1326                 head->r.cond_step++;
1327                 /* fall through */
1328         case 2:
1329                 if (!tomoyo_flush(head))
1330                         break;
1331                 head->r.cond_step++;
1332                 /* fall through */
1333         case 3:
1334                 if (cond->grant_log != TOMOYO_GRANTLOG_AUTO)
1335                         tomoyo_io_printf(head, " grant_log=%s",
1336                                          tomoyo_yesno(cond->grant_log ==
1337                                                       TOMOYO_GRANTLOG_YES));
1338                 tomoyo_set_lf(head);
1339                 return true;
1340         }
1341         return false;
1342 }
1343
1344 /**
1345  * tomoyo_set_group - Print "acl_group " header keyword and category name.
1346  *
1347  * @head:     Pointer to "struct tomoyo_io_buffer".
1348  * @category: Category name.
1349  *
1350  * Returns nothing.
1351  */
1352 static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1353                              const char *category)
1354 {
1355         if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1356                 tomoyo_print_namespace(head);
1357                 tomoyo_io_printf(head, "acl_group %u ",
1358                                  head->r.acl_group_index);
1359         }
1360         tomoyo_set_string(head, category);
1361 }
1362
1363 /**
1364  * tomoyo_print_entry - Print an ACL entry.
1365  *
1366  * @head: Pointer to "struct tomoyo_io_buffer".
1367  * @acl:  Pointer to an ACL entry.
1368  *
1369  * Returns true on success, false otherwise.
1370  */
1371 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1372                                struct tomoyo_acl_info *acl)
1373 {
1374         const u8 acl_type = acl->type;
1375         bool first = true;
1376         u8 bit;
1377
1378         if (head->r.print_cond_part)
1379                 goto print_cond_part;
1380         if (acl->is_deleted)
1381                 return true;
1382         if (!tomoyo_flush(head))
1383                 return false;
1384         else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1385                 struct tomoyo_path_acl *ptr =
1386                         container_of(acl, typeof(*ptr), head);
1387                 const u16 perm = ptr->perm;
1388                 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1389                         if (!(perm & (1 << bit)))
1390                                 continue;
1391                         if (head->r.print_transition_related_only &&
1392                             bit != TOMOYO_TYPE_EXECUTE)
1393                                 continue;
1394                         if (first) {
1395                                 tomoyo_set_group(head, "file ");
1396                                 first = false;
1397                         } else {
1398                                 tomoyo_set_slash(head);
1399                         }
1400                         tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1401                 }
1402                 if (first)
1403                         return true;
1404                 tomoyo_print_name_union(head, &ptr->name);
1405         } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) {
1406                 struct tomoyo_task_acl *ptr =
1407                         container_of(acl, typeof(*ptr), head);
1408                 tomoyo_set_group(head, "task ");
1409                 tomoyo_set_string(head, "manual_domain_transition ");
1410                 tomoyo_set_string(head, ptr->domainname->name);
1411         } else if (head->r.print_transition_related_only) {
1412                 return true;
1413         } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1414                 struct tomoyo_path2_acl *ptr =
1415                         container_of(acl, typeof(*ptr), head);
1416                 const u8 perm = ptr->perm;
1417                 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1418                         if (!(perm & (1 << bit)))
1419                                 continue;
1420                         if (first) {
1421                                 tomoyo_set_group(head, "file ");
1422                                 first = false;
1423                         } else {
1424                                 tomoyo_set_slash(head);
1425                         }
1426                         tomoyo_set_string(head, tomoyo_mac_keywords
1427                                           [tomoyo_pp2mac[bit]]);
1428                 }
1429                 if (first)
1430                         return true;
1431                 tomoyo_print_name_union(head, &ptr->name1);
1432                 tomoyo_print_name_union(head, &ptr->name2);
1433         } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1434                 struct tomoyo_path_number_acl *ptr =
1435                         container_of(acl, typeof(*ptr), head);
1436                 const u8 perm = ptr->perm;
1437                 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1438                         if (!(perm & (1 << bit)))
1439                                 continue;
1440                         if (first) {
1441                                 tomoyo_set_group(head, "file ");
1442                                 first = false;
1443                         } else {
1444                                 tomoyo_set_slash(head);
1445                         }
1446                         tomoyo_set_string(head, tomoyo_mac_keywords
1447                                           [tomoyo_pn2mac[bit]]);
1448                 }
1449                 if (first)
1450                         return true;
1451                 tomoyo_print_name_union(head, &ptr->name);
1452                 tomoyo_print_number_union(head, &ptr->number);
1453         } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1454                 struct tomoyo_mkdev_acl *ptr =
1455                         container_of(acl, typeof(*ptr), head);
1456                 const u8 perm = ptr->perm;
1457                 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1458                         if (!(perm & (1 << bit)))
1459                                 continue;
1460                         if (first) {
1461                                 tomoyo_set_group(head, "file ");
1462                                 first = false;
1463                         } else {
1464                                 tomoyo_set_slash(head);
1465                         }
1466                         tomoyo_set_string(head, tomoyo_mac_keywords
1467                                           [tomoyo_pnnn2mac[bit]]);
1468                 }
1469                 if (first)
1470                         return true;
1471                 tomoyo_print_name_union(head, &ptr->name);
1472                 tomoyo_print_number_union(head, &ptr->mode);
1473                 tomoyo_print_number_union(head, &ptr->major);
1474                 tomoyo_print_number_union(head, &ptr->minor);
1475         } else if (acl_type == TOMOYO_TYPE_INET_ACL) {
1476                 struct tomoyo_inet_acl *ptr =
1477                         container_of(acl, typeof(*ptr), head);
1478                 const u8 perm = ptr->perm;
1479
1480                 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1481                         if (!(perm & (1 << bit)))
1482                                 continue;
1483                         if (first) {
1484                                 tomoyo_set_group(head, "network inet ");
1485                                 tomoyo_set_string(head, tomoyo_proto_keyword
1486                                                   [ptr->protocol]);
1487                                 tomoyo_set_space(head);
1488                                 first = false;
1489                         } else {
1490                                 tomoyo_set_slash(head);
1491                         }
1492                         tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1493                 }
1494                 if (first)
1495                         return true;
1496                 tomoyo_set_space(head);
1497                 if (ptr->address.group) {
1498                         tomoyo_set_string(head, "@");
1499                         tomoyo_set_string(head, ptr->address.group->group_name
1500                                           ->name);
1501                 } else {
1502                         char buf[128];
1503                         tomoyo_print_ip(buf, sizeof(buf), &ptr->address);
1504                         tomoyo_io_printf(head, "%s", buf);
1505                 }
1506                 tomoyo_print_number_union(head, &ptr->port);
1507         } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) {
1508                 struct tomoyo_unix_acl *ptr =
1509                         container_of(acl, typeof(*ptr), head);
1510                 const u8 perm = ptr->perm;
1511
1512                 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1513                         if (!(perm & (1 << bit)))
1514                                 continue;
1515                         if (first) {
1516                                 tomoyo_set_group(head, "network unix ");
1517                                 tomoyo_set_string(head, tomoyo_proto_keyword
1518                                                   [ptr->protocol]);
1519                                 tomoyo_set_space(head);
1520                                 first = false;
1521                         } else {
1522                                 tomoyo_set_slash(head);
1523                         }
1524                         tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1525                 }
1526                 if (first)
1527                         return true;
1528                 tomoyo_print_name_union(head, &ptr->name);
1529         } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1530                 struct tomoyo_mount_acl *ptr =
1531                         container_of(acl, typeof(*ptr), head);
1532                 tomoyo_set_group(head, "file mount");
1533                 tomoyo_print_name_union(head, &ptr->dev_name);
1534                 tomoyo_print_name_union(head, &ptr->dir_name);
1535                 tomoyo_print_name_union(head, &ptr->fs_type);
1536                 tomoyo_print_number_union(head, &ptr->flags);
1537         } else if (acl_type == TOMOYO_TYPE_ENV_ACL) {
1538                 struct tomoyo_env_acl *ptr =
1539                         container_of(acl, typeof(*ptr), head);
1540
1541                 tomoyo_set_group(head, "misc env ");
1542                 tomoyo_set_string(head, ptr->env->name);
1543         }
1544         if (acl->cond) {
1545                 head->r.print_cond_part = true;
1546                 head->r.cond_step = 0;
1547                 if (!tomoyo_flush(head))
1548                         return false;
1549 print_cond_part:
1550                 if (!tomoyo_print_condition(head, acl->cond))
1551                         return false;
1552                 head->r.print_cond_part = false;
1553         } else {
1554                 tomoyo_set_lf(head);
1555         }
1556         return true;
1557 }
1558
1559 /**
1560  * tomoyo_read_domain2 - Read domain policy.
1561  *
1562  * @head: Pointer to "struct tomoyo_io_buffer".
1563  * @list: Pointer to "struct list_head".
1564  *
1565  * Caller holds tomoyo_read_lock().
1566  *
1567  * Returns true on success, false otherwise.
1568  */
1569 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1570                                 struct list_head *list)
1571 {
1572         list_for_each_cookie(head->r.acl, list) {
1573                 struct tomoyo_acl_info *ptr =
1574                         list_entry(head->r.acl, typeof(*ptr), list);
1575                 if (!tomoyo_print_entry(head, ptr))
1576                         return false;
1577         }
1578         head->r.acl = NULL;
1579         return true;
1580 }
1581
1582 /**
1583  * tomoyo_read_domain - Read domain policy.
1584  *
1585  * @head: Pointer to "struct tomoyo_io_buffer".
1586  *
1587  * Caller holds tomoyo_read_lock().
1588  */
1589 static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1590 {
1591         if (head->r.eof)
1592                 return;
1593         list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1594                 struct tomoyo_domain_info *domain =
1595                         list_entry(head->r.domain, typeof(*domain), list);
1596                 switch (head->r.step) {
1597                         u8 i;
1598                 case 0:
1599                         if (domain->is_deleted &&
1600                             !head->r.print_this_domain_only)
1601                                 continue;
1602                         /* Print domainname and flags. */
1603                         tomoyo_set_string(head, domain->domainname->name);
1604                         tomoyo_set_lf(head);
1605                         tomoyo_io_printf(head, "use_profile %u\n",
1606                                          domain->profile);
1607                         tomoyo_io_printf(head, "use_group %u\n",
1608                                          domain->group);
1609                         for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1610                                 if (domain->flags[i])
1611                                         tomoyo_set_string(head, tomoyo_dif[i]);
1612                         head->r.step++;
1613                         tomoyo_set_lf(head);
1614                         /* fall through */
1615                 case 1:
1616                         if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1617                                 return;
1618                         head->r.step++;
1619                         if (!tomoyo_set_lf(head))
1620                                 return;
1621                         /* fall through */
1622                 case 2:
1623                         head->r.step = 0;
1624                         if (head->r.print_this_domain_only)
1625                                 goto done;
1626                 }
1627         }
1628  done:
1629         head->r.eof = true;
1630 }
1631
1632 /**
1633  * tomoyo_write_pid: Specify PID to obtain domainname.
1634  *
1635  * @head: Pointer to "struct tomoyo_io_buffer".
1636  *
1637  * Returns 0.
1638  */
1639 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1640 {
1641         head->r.eof = false;
1642         return 0;
1643 }
1644
1645 /**
1646  * tomoyo_read_pid - Get domainname of the specified PID.
1647  *
1648  * @head: Pointer to "struct tomoyo_io_buffer".
1649  *
1650  * Returns the domainname which the specified PID is in on success,
1651  * empty string otherwise.
1652  * The PID is specified by tomoyo_write_pid() so that the user can obtain
1653  * using read()/write() interface rather than sysctl() interface.
1654  */
1655 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1656 {
1657         char *buf = head->write_buf;
1658         bool global_pid = false;
1659         unsigned int pid;
1660         struct task_struct *p;
1661         struct tomoyo_domain_info *domain = NULL;
1662
1663         /* Accessing write_buf is safe because head->io_sem is held. */
1664         if (!buf) {
1665                 head->r.eof = true;
1666                 return; /* Do nothing if open(O_RDONLY). */
1667         }
1668         if (head->r.w_pos || head->r.eof)
1669                 return;
1670         head->r.eof = true;
1671         if (tomoyo_str_starts(&buf, "global-pid "))
1672                 global_pid = true;
1673         pid = (unsigned int) simple_strtoul(buf, NULL, 10);
1674         rcu_read_lock();
1675         if (global_pid)
1676                 p = find_task_by_pid_ns(pid, &init_pid_ns);
1677         else
1678                 p = find_task_by_vpid(pid);
1679         if (p)
1680                 domain = tomoyo_real_domain(p);
1681         rcu_read_unlock();
1682         if (!domain)
1683                 return;
1684         tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1685         tomoyo_set_string(head, domain->domainname->name);
1686 }
1687
1688 /* String table for domain transition control keywords. */
1689 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1690         [TOMOYO_TRANSITION_CONTROL_NO_RESET]      = "no_reset_domain ",
1691         [TOMOYO_TRANSITION_CONTROL_RESET]         = "reset_domain ",
1692         [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1693         [TOMOYO_TRANSITION_CONTROL_INITIALIZE]    = "initialize_domain ",
1694         [TOMOYO_TRANSITION_CONTROL_NO_KEEP]       = "no_keep_domain ",
1695         [TOMOYO_TRANSITION_CONTROL_KEEP]          = "keep_domain ",
1696 };
1697
1698 /* String table for grouping keywords. */
1699 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1700         [TOMOYO_PATH_GROUP]    = "path_group ",
1701         [TOMOYO_NUMBER_GROUP]  = "number_group ",
1702         [TOMOYO_ADDRESS_GROUP] = "address_group ",
1703 };
1704
1705 /**
1706  * tomoyo_write_exception - Write exception policy.
1707  *
1708  * @head: Pointer to "struct tomoyo_io_buffer".
1709  *
1710  * Returns 0 on success, negative value otherwise.
1711  *
1712  * Caller holds tomoyo_read_lock().
1713  */
1714 static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1715 {
1716         const bool is_delete = head->w.is_delete;
1717         struct tomoyo_acl_param param = {
1718                 .ns = head->w.ns,
1719                 .is_delete = is_delete,
1720                 .data = head->write_buf,
1721         };
1722         u8 i;
1723         if (tomoyo_str_starts(&param.data, "aggregator "))
1724                 return tomoyo_write_aggregator(&param);
1725         for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1726                 if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
1727                         return tomoyo_write_transition_control(&param, i);
1728         for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1729                 if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
1730                         return tomoyo_write_group(&param, i);
1731         if (tomoyo_str_starts(&param.data, "acl_group ")) {
1732                 unsigned int group;
1733                 char *data;
1734                 group = simple_strtoul(param.data, &data, 10);
1735                 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1736                         return tomoyo_write_domain2
1737                                 (head->w.ns, &head->w.ns->acl_group[group],
1738                                  data, is_delete);
1739         }
1740         return -EINVAL;
1741 }
1742
1743 /**
1744  * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
1745  *
1746  * @head: Pointer to "struct tomoyo_io_buffer".
1747  * @idx:  Index number.
1748  *
1749  * Returns true on success, false otherwise.
1750  *
1751  * Caller holds tomoyo_read_lock().
1752  */
1753 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1754 {
1755         struct tomoyo_policy_namespace *ns =
1756                 container_of(head->r.ns, typeof(*ns), namespace_list);
1757         struct list_head *list = &ns->group_list[idx];
1758         list_for_each_cookie(head->r.group, list) {
1759                 struct tomoyo_group *group =
1760                         list_entry(head->r.group, typeof(*group), head.list);
1761                 list_for_each_cookie(head->r.acl, &group->member_list) {
1762                         struct tomoyo_acl_head *ptr =
1763                                 list_entry(head->r.acl, typeof(*ptr), list);
1764                         if (ptr->is_deleted)
1765                                 continue;
1766                         if (!tomoyo_flush(head))
1767                                 return false;
1768                         tomoyo_print_namespace(head);
1769                         tomoyo_set_string(head, tomoyo_group_name[idx]);
1770                         tomoyo_set_string(head, group->group_name->name);
1771                         if (idx == TOMOYO_PATH_GROUP) {
1772                                 tomoyo_set_space(head);
1773                                 tomoyo_set_string(head, container_of
1774                                                (ptr, struct tomoyo_path_group,
1775                                                 head)->member_name->name);
1776                         } else if (idx == TOMOYO_NUMBER_GROUP) {
1777                                 tomoyo_print_number_union(head, &container_of
1778                                                           (ptr,
1779                                                    struct tomoyo_number_group,
1780                                                            head)->number);
1781                         } else if (idx == TOMOYO_ADDRESS_GROUP) {
1782                                 char buffer[128];
1783
1784                                 struct tomoyo_address_group *member =
1785                                         container_of(ptr, typeof(*member),
1786                                                      head);
1787                                 tomoyo_print_ip(buffer, sizeof(buffer),
1788                                                 &member->address);
1789                                 tomoyo_io_printf(head, " %s", buffer);
1790                         }
1791                         tomoyo_set_lf(head);
1792                 }
1793                 head->r.acl = NULL;
1794         }
1795         head->r.group = NULL;
1796         return true;
1797 }
1798
1799 /**
1800  * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1801  *
1802  * @head: Pointer to "struct tomoyo_io_buffer".
1803  * @idx:  Index number.
1804  *
1805  * Returns true on success, false otherwise.
1806  *
1807  * Caller holds tomoyo_read_lock().
1808  */
1809 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1810 {
1811         struct tomoyo_policy_namespace *ns =
1812                 container_of(head->r.ns, typeof(*ns), namespace_list);
1813         struct list_head *list = &ns->policy_list[idx];
1814         list_for_each_cookie(head->r.acl, list) {
1815                 struct tomoyo_acl_head *acl =
1816                         container_of(head->r.acl, typeof(*acl), list);
1817                 if (acl->is_deleted)
1818                         continue;
1819                 if (!tomoyo_flush(head))
1820                         return false;
1821                 switch (idx) {
1822                 case TOMOYO_ID_TRANSITION_CONTROL:
1823                         {
1824                                 struct tomoyo_transition_control *ptr =
1825                                         container_of(acl, typeof(*ptr), head);
1826                                 tomoyo_print_namespace(head);
1827                                 tomoyo_set_string(head, tomoyo_transition_type
1828                                                   [ptr->type]);
1829                                 tomoyo_set_string(head, ptr->program ?
1830                                                   ptr->program->name : "any");
1831                                 tomoyo_set_string(head, " from ");
1832                                 tomoyo_set_string(head, ptr->domainname ?
1833                                                   ptr->domainname->name :
1834                                                   "any");
1835                         }
1836                         break;
1837                 case TOMOYO_ID_AGGREGATOR:
1838                         {
1839                                 struct tomoyo_aggregator *ptr =
1840                                         container_of(acl, typeof(*ptr), head);
1841                                 tomoyo_print_namespace(head);
1842                                 tomoyo_set_string(head, "aggregator ");
1843                                 tomoyo_set_string(head,
1844                                                   ptr->original_name->name);
1845                                 tomoyo_set_space(head);
1846                                 tomoyo_set_string(head,
1847                                                ptr->aggregated_name->name);
1848                         }
1849                         break;
1850                 default:
1851                         continue;
1852                 }
1853                 tomoyo_set_lf(head);
1854         }
1855         head->r.acl = NULL;
1856         return true;
1857 }
1858
1859 /**
1860  * tomoyo_read_exception - Read exception policy.
1861  *
1862  * @head: Pointer to "struct tomoyo_io_buffer".
1863  *
1864  * Caller holds tomoyo_read_lock().
1865  */
1866 static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1867 {
1868         struct tomoyo_policy_namespace *ns =
1869                 container_of(head->r.ns, typeof(*ns), namespace_list);
1870         if (head->r.eof)
1871                 return;
1872         while (head->r.step < TOMOYO_MAX_POLICY &&
1873                tomoyo_read_policy(head, head->r.step))
1874                 head->r.step++;
1875         if (head->r.step < TOMOYO_MAX_POLICY)
1876                 return;
1877         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1878                tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1879                 head->r.step++;
1880         if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1881                 return;
1882         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1883                + TOMOYO_MAX_ACL_GROUPS) {
1884                 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1885                         - TOMOYO_MAX_GROUP;
1886                 if (!tomoyo_read_domain2(head, &ns->acl_group
1887                                          [head->r.acl_group_index]))
1888                         return;
1889                 head->r.step++;
1890         }
1891         head->r.eof = true;
1892 }
1893
1894 /* Wait queue for kernel -> userspace notification. */
1895 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1896 /* Wait queue for userspace -> kernel notification. */
1897 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1898
1899 /* Structure for query. */
1900 struct tomoyo_query {
1901         struct list_head list;
1902         struct tomoyo_domain_info *domain;
1903         char *query;
1904         size_t query_len;
1905         unsigned int serial;
1906         u8 timer;
1907         u8 answer;
1908         u8 retry;
1909 };
1910
1911 /* The list for "struct tomoyo_query". */
1912 static LIST_HEAD(tomoyo_query_list);
1913
1914 /* Lock for manipulating tomoyo_query_list. */
1915 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1916
1917 /*
1918  * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1919  * interface.
1920  */
1921 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1922
1923 /**
1924  * tomoyo_truncate - Truncate a line.
1925  *
1926  * @str: String to truncate.
1927  *
1928  * Returns length of truncated @str.
1929  */
1930 static int tomoyo_truncate(char *str)
1931 {
1932         char *start = str;
1933         while (*(unsigned char *) str > (unsigned char) ' ')
1934                 str++;
1935         *str = '\0';
1936         return strlen(start) + 1;
1937 }
1938
1939 /**
1940  * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1941  *
1942  * @domain: Pointer to "struct tomoyo_domain_info".
1943  * @header: Lines containing ACL.
1944  *
1945  * Returns nothing.
1946  */
1947 static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
1948 {
1949         char *buffer;
1950         char *realpath = NULL;
1951         char *argv0 = NULL;
1952         char *symlink = NULL;
1953         char *cp = strchr(header, '\n');
1954         int len;
1955         if (!cp)
1956                 return;
1957         cp = strchr(cp + 1, '\n');
1958         if (!cp)
1959                 return;
1960         *cp++ = '\0';
1961         len = strlen(cp) + 1;
1962         /* strstr() will return NULL if ordering is wrong. */
1963         if (*cp == 'f') {
1964                 argv0 = strstr(header, " argv[]={ \"");
1965                 if (argv0) {
1966                         argv0 += 10;
1967                         len += tomoyo_truncate(argv0) + 14;
1968                 }
1969                 realpath = strstr(header, " exec={ realpath=\"");
1970                 if (realpath) {
1971                         realpath += 8;
1972                         len += tomoyo_truncate(realpath) + 6;
1973                 }
1974                 symlink = strstr(header, " symlink.target=\"");
1975                 if (symlink)
1976                         len += tomoyo_truncate(symlink + 1) + 1;
1977         }
1978         buffer = kmalloc(len, GFP_NOFS);
1979         if (!buffer)
1980                 return;
1981         snprintf(buffer, len - 1, "%s", cp);
1982         if (realpath)
1983                 tomoyo_addprintf(buffer, len, " exec.%s", realpath);
1984         if (argv0)
1985                 tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
1986         if (symlink)
1987                 tomoyo_addprintf(buffer, len, "%s", symlink);
1988         tomoyo_normalize_line(buffer);
1989         if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
1990                                   false))
1991                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
1992         kfree(buffer);
1993 }
1994
1995 /**
1996  * tomoyo_supervisor - Ask for the supervisor's decision.
1997  *
1998  * @r:   Pointer to "struct tomoyo_request_info".
1999  * @fmt: The printf()'s format string, followed by parameters.
2000  *
2001  * Returns 0 if the supervisor decided to permit the access request which
2002  * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
2003  * supervisor decided to retry the access request which violated the policy in
2004  * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
2005  */
2006 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
2007 {
2008         va_list args;
2009         int error;
2010         int len;
2011         static unsigned int tomoyo_serial;
2012         struct tomoyo_query entry = { };
2013         bool quota_exceeded = false;
2014         va_start(args, fmt);
2015         len = vsnprintf((char *) &len, 1, fmt, args) + 1;
2016         va_end(args);
2017         /* Write /sys/kernel/security/tomoyo/audit. */
2018         va_start(args, fmt);
2019         tomoyo_write_log2(r, len, fmt, args);
2020         va_end(args);
2021         /* Nothing more to do if granted. */
2022         if (r->granted)
2023                 return 0;
2024         if (r->mode)
2025                 tomoyo_update_stat(r->mode);
2026         switch (r->mode) {
2027         case TOMOYO_CONFIG_ENFORCING:
2028                 error = -EPERM;
2029                 if (atomic_read(&tomoyo_query_observers))
2030                         break;
2031                 goto out;
2032         case TOMOYO_CONFIG_LEARNING:
2033                 error = 0;
2034                 /* Check max_learning_entry parameter. */
2035                 if (tomoyo_domain_quota_is_ok(r))
2036                         break;
2037                 /* fall through */
2038         default:
2039                 return 0;
2040         }
2041         /* Get message. */
2042         va_start(args, fmt);
2043         entry.query = tomoyo_init_log(r, len, fmt, args);
2044         va_end(args);
2045         if (!entry.query)
2046                 goto out;
2047         entry.query_len = strlen(entry.query) + 1;
2048         if (!error) {
2049                 tomoyo_add_entry(r->domain, entry.query);
2050                 goto out;
2051         }
2052         len = tomoyo_round2(entry.query_len);
2053         entry.domain = r->domain;
2054         spin_lock(&tomoyo_query_list_lock);
2055         if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
2056             tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
2057             >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
2058                 quota_exceeded = true;
2059         } else {
2060                 entry.serial = tomoyo_serial++;
2061                 entry.retry = r->retry;
2062                 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
2063                 list_add_tail(&entry.list, &tomoyo_query_list);
2064         }
2065         spin_unlock(&tomoyo_query_list_lock);
2066         if (quota_exceeded)
2067                 goto out;
2068         /* Give 10 seconds for supervisor's opinion. */
2069         while (entry.timer < 10) {
2070                 wake_up_all(&tomoyo_query_wait);
2071                 if (wait_event_interruptible_timeout
2072                     (tomoyo_answer_wait, entry.answer ||
2073                      !atomic_read(&tomoyo_query_observers), HZ))
2074                         break;
2075                 else
2076                         entry.timer++;
2077         }
2078         spin_lock(&tomoyo_query_list_lock);
2079         list_del(&entry.list);
2080         tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
2081         spin_unlock(&tomoyo_query_list_lock);
2082         switch (entry.answer) {
2083         case 3: /* Asked to retry by administrator. */
2084                 error = TOMOYO_RETRY_REQUEST;
2085                 r->retry++;
2086                 break;
2087         case 1:
2088                 /* Granted by administrator. */
2089                 error = 0;
2090                 break;
2091         default:
2092                 /* Timed out or rejected by administrator. */
2093                 break;
2094         }
2095 out:
2096         kfree(entry.query);
2097         return error;
2098 }
2099
2100 /**
2101  * tomoyo_find_domain_by_qid - Get domain by query id.
2102  *
2103  * @serial: Query ID assigned by tomoyo_supervisor().
2104  *
2105  * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
2106  */
2107 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
2108 (unsigned int serial)
2109 {
2110         struct tomoyo_query *ptr;
2111         struct tomoyo_domain_info *domain = NULL;
2112         spin_lock(&tomoyo_query_list_lock);
2113         list_for_each_entry(ptr, &tomoyo_query_list, list) {
2114                 if (ptr->serial != serial || ptr->answer)
2115                         continue;
2116                 domain = ptr->domain;
2117                 break;
2118         }
2119         spin_unlock(&tomoyo_query_list_lock);
2120         return domain;
2121 }
2122
2123 /**
2124  * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
2125  *
2126  * @file: Pointer to "struct file".
2127  * @wait: Pointer to "poll_table".
2128  *
2129  * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
2130  *
2131  * Waits for access requests which violated policy in enforcing mode.
2132  */
2133 static int tomoyo_poll_query(struct file *file, poll_table *wait)
2134 {
2135         struct list_head *tmp;
2136         bool found = false;
2137         u8 i;
2138         for (i = 0; i < 2; i++) {
2139                 spin_lock(&tomoyo_query_list_lock);
2140                 list_for_each(tmp, &tomoyo_query_list) {
2141                         struct tomoyo_query *ptr =
2142                                 list_entry(tmp, typeof(*ptr), list);
2143                         if (ptr->answer)
2144                                 continue;
2145                         found = true;
2146                         break;
2147                 }
2148                 spin_unlock(&tomoyo_query_list_lock);
2149                 if (found)
2150                         return POLLIN | POLLRDNORM;
2151                 if (i)
2152                         break;
2153                 poll_wait(file, &tomoyo_query_wait, wait);
2154         }
2155         return 0;
2156 }
2157
2158 /**
2159  * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
2160  *
2161  * @head: Pointer to "struct tomoyo_io_buffer".
2162  */
2163 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
2164 {
2165         struct list_head *tmp;
2166         unsigned int pos = 0;
2167         size_t len = 0;
2168         char *buf;
2169         if (head->r.w_pos)
2170                 return;
2171         if (head->read_buf) {
2172                 kfree(head->read_buf);
2173                 head->read_buf = NULL;
2174         }
2175         spin_lock(&tomoyo_query_list_lock);
2176         list_for_each(tmp, &tomoyo_query_list) {
2177                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2178                 if (ptr->answer)
2179                         continue;
2180                 if (pos++ != head->r.query_index)
2181                         continue;
2182                 len = ptr->query_len;
2183                 break;
2184         }
2185         spin_unlock(&tomoyo_query_list_lock);
2186         if (!len) {
2187                 head->r.query_index = 0;
2188                 return;
2189         }
2190         buf = kzalloc(len + 32, GFP_NOFS);
2191         if (!buf)
2192                 return;
2193         pos = 0;
2194         spin_lock(&tomoyo_query_list_lock);
2195         list_for_each(tmp, &tomoyo_query_list) {
2196                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2197                 if (ptr->answer)
2198                         continue;
2199                 if (pos++ != head->r.query_index)
2200                         continue;
2201                 /*
2202                  * Some query can be skipped because tomoyo_query_list
2203                  * can change, but I don't care.
2204                  */
2205                 if (len == ptr->query_len)
2206                         snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
2207                                  ptr->retry, ptr->query);
2208                 break;
2209         }
2210         spin_unlock(&tomoyo_query_list_lock);
2211         if (buf[0]) {
2212                 head->read_buf = buf;
2213                 head->r.w[head->r.w_pos++] = buf;
2214                 head->r.query_index++;
2215         } else {
2216                 kfree(buf);
2217         }
2218 }
2219
2220 /**
2221  * tomoyo_write_answer - Write the supervisor's decision.
2222  *
2223  * @head: Pointer to "struct tomoyo_io_buffer".
2224  *
2225  * Returns 0 on success, -EINVAL otherwise.
2226  */
2227 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
2228 {
2229         char *data = head->write_buf;
2230         struct list_head *tmp;
2231         unsigned int serial;
2232         unsigned int answer;
2233         spin_lock(&tomoyo_query_list_lock);
2234         list_for_each(tmp, &tomoyo_query_list) {
2235                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2236                 ptr->timer = 0;
2237         }
2238         spin_unlock(&tomoyo_query_list_lock);
2239         if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
2240                 return -EINVAL;
2241         spin_lock(&tomoyo_query_list_lock);
2242         list_for_each(tmp, &tomoyo_query_list) {
2243                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2244                 if (ptr->serial != serial)
2245                         continue;
2246                 if (!ptr->answer)
2247                         ptr->answer = answer;
2248                 break;
2249         }
2250         spin_unlock(&tomoyo_query_list_lock);
2251         return 0;
2252 }
2253
2254 /**
2255  * tomoyo_read_version: Get version.
2256  *
2257  * @head: Pointer to "struct tomoyo_io_buffer".
2258  *
2259  * Returns version information.
2260  */
2261 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2262 {
2263         if (!head->r.eof) {
2264                 tomoyo_io_printf(head, "2.5.0");
2265                 head->r.eof = true;
2266         }
2267 }
2268
2269 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2270 static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2271         [TOMOYO_STAT_POLICY_UPDATES]    = "update:",
2272         [TOMOYO_STAT_POLICY_LEARNING]   = "violation in learning mode:",
2273         [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2274         [TOMOYO_STAT_POLICY_ENFORCING]  = "violation in enforcing mode:",
2275 };
2276
2277 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2278 static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2279         [TOMOYO_MEMORY_POLICY] = "policy:",
2280         [TOMOYO_MEMORY_AUDIT]  = "audit log:",
2281         [TOMOYO_MEMORY_QUERY]  = "query message:",
2282 };
2283
2284 /* Timestamp counter for last updated. */
2285 static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2286 /* Counter for number of updates. */
2287 static unsigned int tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2288
2289 /**
2290  * tomoyo_update_stat - Update statistic counters.
2291  *
2292  * @index: Index for policy type.
2293  *
2294  * Returns nothing.
2295  */
2296 void tomoyo_update_stat(const u8 index)
2297 {
2298         struct timeval tv;
2299         do_gettimeofday(&tv);
2300         /*
2301          * I don't use atomic operations because race condition is not fatal.
2302          */
2303         tomoyo_stat_updated[index]++;
2304         tomoyo_stat_modified[index] = tv.tv_sec;
2305 }
2306
2307 /**
2308  * tomoyo_read_stat - Read statistic data.
2309  *
2310  * @head: Pointer to "struct tomoyo_io_buffer".
2311  *
2312  * Returns nothing.
2313  */
2314 static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2315 {
2316         u8 i;
2317         unsigned int total = 0;
2318         if (head->r.eof)
2319                 return;
2320         for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2321                 tomoyo_io_printf(head, "Policy %-30s %10u",
2322                                  tomoyo_policy_headers[i],
2323                                  tomoyo_stat_updated[i]);
2324                 if (tomoyo_stat_modified[i]) {
2325                         struct tomoyo_time stamp;
2326                         tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2327                         tomoyo_io_printf(head, " (Last: %04u/%02u/%02u "
2328                                          "%02u:%02u:%02u)",
2329                                          stamp.year, stamp.month, stamp.day,
2330                                          stamp.hour, stamp.min, stamp.sec);
2331                 }
2332                 tomoyo_set_lf(head);
2333         }
2334         for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2335                 unsigned int used = tomoyo_memory_used[i];
2336                 total += used;
2337                 tomoyo_io_printf(head, "Memory used by %-22s %10u",
2338                                  tomoyo_memory_headers[i], used);
2339                 used = tomoyo_memory_quota[i];
2340                 if (used)
2341                         tomoyo_io_printf(head, " (Quota: %10u)", used);
2342                 tomoyo_set_lf(head);
2343         }
2344         tomoyo_io_printf(head, "Total memory used:                    %10u\n",
2345                          total);
2346         head->r.eof = true;
2347 }
2348
2349 /**
2350  * tomoyo_write_stat - Set memory quota.
2351  *
2352  * @head: Pointer to "struct tomoyo_io_buffer".
2353  *
2354  * Returns 0.
2355  */
2356 static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2357 {
2358         char *data = head->write_buf;
2359         u8 i;
2360         if (tomoyo_str_starts(&data, "Memory used by "))
2361                 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2362                         if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2363                                 sscanf(data, "%u", &tomoyo_memory_quota[i]);
2364         return 0;
2365 }
2366
2367 /**
2368  * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2369  *
2370  * @type: Type of interface.
2371  * @file: Pointer to "struct file".
2372  *
2373  * Returns 0 on success, negative value otherwise.
2374  */
2375 int tomoyo_open_control(const u8 type, struct file *file)
2376 {
2377         struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2378
2379         if (!head)
2380                 return -ENOMEM;
2381         mutex_init(&head->io_sem);
2382         head->type = type;
2383         switch (type) {
2384         case TOMOYO_DOMAINPOLICY:
2385                 /* /sys/kernel/security/tomoyo/domain_policy */
2386                 head->write = tomoyo_write_domain;
2387                 head->read = tomoyo_read_domain;
2388                 break;
2389         case TOMOYO_EXCEPTIONPOLICY:
2390                 /* /sys/kernel/security/tomoyo/exception_policy */
2391                 head->write = tomoyo_write_exception;
2392                 head->read = tomoyo_read_exception;
2393                 break;
2394         case TOMOYO_AUDIT:
2395                 /* /sys/kernel/security/tomoyo/audit */
2396                 head->poll = tomoyo_poll_log;
2397                 head->read = tomoyo_read_log;
2398                 break;
2399         case TOMOYO_PROCESS_STATUS:
2400                 /* /sys/kernel/security/tomoyo/.process_status */
2401                 head->write = tomoyo_write_pid;
2402                 head->read = tomoyo_read_pid;
2403                 break;
2404         case TOMOYO_VERSION:
2405                 /* /sys/kernel/security/tomoyo/version */
2406                 head->read = tomoyo_read_version;
2407                 head->readbuf_size = 128;
2408                 break;
2409         case TOMOYO_STAT:
2410                 /* /sys/kernel/security/tomoyo/stat */
2411                 head->write = tomoyo_write_stat;
2412                 head->read = tomoyo_read_stat;
2413                 head->readbuf_size = 1024;
2414                 break;
2415         case TOMOYO_PROFILE:
2416                 /* /sys/kernel/security/tomoyo/profile */
2417                 head->write = tomoyo_write_profile;
2418                 head->read = tomoyo_read_profile;
2419                 break;
2420         case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2421                 head->poll = tomoyo_poll_query;
2422                 head->write = tomoyo_write_answer;
2423                 head->read = tomoyo_read_query;
2424                 break;
2425         case TOMOYO_MANAGER:
2426                 /* /sys/kernel/security/tomoyo/manager */
2427                 head->write = tomoyo_write_manager;
2428                 head->read = tomoyo_read_manager;
2429                 break;
2430         }
2431         if (!(file->f_mode & FMODE_READ)) {
2432                 /*
2433                  * No need to allocate read_buf since it is not opened
2434                  * for reading.
2435                  */
2436                 head->read = NULL;
2437                 head->poll = NULL;
2438         } else if (!head->poll) {
2439                 /* Don't allocate read_buf for poll() access. */
2440                 if (!head->readbuf_size)
2441                         head->readbuf_size = 4096 * 2;
2442                 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2443                 if (!head->read_buf) {
2444                         kfree(head);
2445                         return -ENOMEM;
2446                 }
2447         }
2448         if (!(file->f_mode & FMODE_WRITE)) {
2449                 /*
2450                  * No need to allocate write_buf since it is not opened
2451                  * for writing.
2452                  */
2453                 head->write = NULL;
2454         } else if (head->write) {
2455                 head->writebuf_size = 4096 * 2;
2456                 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2457                 if (!head->write_buf) {
2458                         kfree(head->read_buf);
2459                         kfree(head);
2460                         return -ENOMEM;
2461                 }
2462         }
2463         /*
2464          * If the file is /sys/kernel/security/tomoyo/query , increment the
2465          * observer counter.
2466          * The obserber counter is used by tomoyo_supervisor() to see if
2467          * there is some process monitoring /sys/kernel/security/tomoyo/query.
2468          */
2469         if (type == TOMOYO_QUERY)
2470                 atomic_inc(&tomoyo_query_observers);
2471         file->private_data = head;
2472         tomoyo_notify_gc(head, true);
2473         return 0;
2474 }
2475
2476 /**
2477  * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2478  *
2479  * @file: Pointer to "struct file".
2480  * @wait: Pointer to "poll_table".
2481  *
2482  * Waits for read readiness.
2483  * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd and
2484  * /sys/kernel/security/tomoyo/audit is handled by /usr/sbin/tomoyo-auditd.
2485  */
2486 int tomoyo_poll_control(struct file *file, poll_table *wait)
2487 {
2488         struct tomoyo_io_buffer *head = file->private_data;
2489         if (!head->poll)
2490                 return -ENOSYS;
2491         return head->poll(file, wait);
2492 }
2493
2494 /**
2495  * tomoyo_set_namespace_cursor - Set namespace to read.
2496  *
2497  * @head: Pointer to "struct tomoyo_io_buffer".
2498  *
2499  * Returns nothing.
2500  */
2501 static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2502 {
2503         struct list_head *ns;
2504         if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2505             head->type != TOMOYO_PROFILE)
2506                 return;
2507         /*
2508          * If this is the first read, or reading previous namespace finished
2509          * and has more namespaces to read, update the namespace cursor.
2510          */
2511         ns = head->r.ns;
2512         if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2513                 /* Clearing is OK because tomoyo_flush() returned true. */
2514                 memset(&head->r, 0, sizeof(head->r));
2515                 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2516         }
2517 }
2518
2519 /**
2520  * tomoyo_has_more_namespace - Check for unread namespaces.
2521  *
2522  * @head: Pointer to "struct tomoyo_io_buffer".
2523  *
2524  * Returns true if we have more entries to print, false otherwise.
2525  */
2526 static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2527 {
2528         return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2529                 head->type == TOMOYO_PROFILE) && head->r.eof &&
2530                 head->r.ns->next != &tomoyo_namespace_list;
2531 }
2532
2533 /**
2534  * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2535  *
2536  * @head:       Pointer to "struct tomoyo_io_buffer".
2537  * @buffer:     Poiner to buffer to write to.
2538  * @buffer_len: Size of @buffer.
2539  *
2540  * Returns bytes read on success, negative value otherwise.
2541  */
2542 ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2543                             const int buffer_len)
2544 {
2545         int len;
2546         int idx;
2547
2548         if (!head->read)
2549                 return -ENOSYS;
2550         if (mutex_lock_interruptible(&head->io_sem))
2551                 return -EINTR;
2552         head->read_user_buf = buffer;
2553         head->read_user_buf_avail = buffer_len;
2554         idx = tomoyo_read_lock();
2555         if (tomoyo_flush(head))
2556                 /* Call the policy handler. */
2557                 do {
2558                         tomoyo_set_namespace_cursor(head);
2559                         head->read(head);
2560                 } while (tomoyo_flush(head) &&
2561                          tomoyo_has_more_namespace(head));
2562         tomoyo_read_unlock(idx);
2563         len = head->read_user_buf - buffer;
2564         mutex_unlock(&head->io_sem);
2565         return len;
2566 }
2567
2568 /**
2569  * tomoyo_parse_policy - Parse a policy line.
2570  *
2571  * @head: Poiter to "struct tomoyo_io_buffer".
2572  * @line: Line to parse.
2573  *
2574  * Returns 0 on success, negative value otherwise.
2575  *
2576  * Caller holds tomoyo_read_lock().
2577  */
2578 static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2579 {
2580         /* Delete request? */
2581         head->w.is_delete = !strncmp(line, "delete ", 7);
2582         if (head->w.is_delete)
2583                 memmove(line, line + 7, strlen(line + 7) + 1);
2584         /* Selecting namespace to update. */
2585         if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2586             head->type == TOMOYO_PROFILE) {
2587                 if (*line == '<') {
2588                         char *cp = strchr(line, ' ');
2589                         if (cp) {
2590                                 *cp++ = '\0';
2591                                 head->w.ns = tomoyo_assign_namespace(line);
2592                                 memmove(line, cp, strlen(cp) + 1);
2593                         } else
2594                                 head->w.ns = NULL;
2595                 } else
2596                         head->w.ns = &tomoyo_kernel_namespace;
2597                 /* Don't allow updating if namespace is invalid. */
2598                 if (!head->w.ns)
2599                         return -ENOENT;
2600         }
2601         /* Do the update. */
2602         return head->write(head);
2603 }
2604
2605 /**
2606  * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2607  *
2608  * @head:       Pointer to "struct tomoyo_io_buffer".
2609  * @buffer:     Pointer to buffer to read from.
2610  * @buffer_len: Size of @buffer.
2611  *
2612  * Returns @buffer_len on success, negative value otherwise.
2613  */
2614 ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2615                              const char __user *buffer, const int buffer_len)
2616 {
2617         int error = buffer_len;
2618         size_t avail_len = buffer_len;
2619         char *cp0 = head->write_buf;
2620         int idx;
2621         if (!head->write)
2622                 return -ENOSYS;
2623         if (!access_ok(VERIFY_READ, buffer, buffer_len))
2624                 return -EFAULT;
2625         if (mutex_lock_interruptible(&head->io_sem))
2626                 return -EINTR;
2627         head->read_user_buf_avail = 0;
2628         idx = tomoyo_read_lock();
2629         /* Read a line and dispatch it to the policy handler. */
2630         while (avail_len > 0) {
2631                 char c;
2632                 if (head->w.avail >= head->writebuf_size - 1) {
2633                         const int len = head->writebuf_size * 2;
2634                         char *cp = kzalloc(len, GFP_NOFS);
2635                         if (!cp) {
2636                                 error = -ENOMEM;
2637                                 break;
2638                         }
2639                         memmove(cp, cp0, head->w.avail);
2640                         kfree(cp0);
2641                         head->write_buf = cp;
2642                         cp0 = cp;
2643                         head->writebuf_size = len;
2644                 }
2645                 if (get_user(c, buffer)) {
2646                         error = -EFAULT;
2647                         break;
2648                 }
2649                 buffer++;
2650                 avail_len--;
2651                 cp0[head->w.avail++] = c;
2652                 if (c != '\n')
2653                         continue;
2654                 cp0[head->w.avail - 1] = '\0';
2655                 head->w.avail = 0;
2656                 tomoyo_normalize_line(cp0);
2657                 if (!strcmp(cp0, "reset")) {
2658                         head->w.ns = &tomoyo_kernel_namespace;
2659                         head->w.domain = NULL;
2660                         memset(&head->r, 0, sizeof(head->r));
2661                         continue;
2662                 }
2663                 /* Don't allow updating policies by non manager programs. */
2664                 switch (head->type) {
2665                 case TOMOYO_PROCESS_STATUS:
2666                         /* This does not write anything. */
2667                         break;
2668                 case TOMOYO_DOMAINPOLICY:
2669                         if (tomoyo_select_domain(head, cp0))
2670                                 continue;
2671                         /* fall through */
2672                 case TOMOYO_EXCEPTIONPOLICY:
2673                         if (!strcmp(cp0, "select transition_only")) {
2674                                 head->r.print_transition_related_only = true;
2675                                 continue;
2676                         }
2677                         /* fall through */
2678                 default:
2679                         if (!tomoyo_manager()) {
2680                                 error = -EPERM;
2681                                 goto out;
2682                         }
2683                 }
2684                 switch (tomoyo_parse_policy(head, cp0)) {
2685                 case -EPERM:
2686                         error = -EPERM;
2687                         goto out;
2688                 case 0:
2689                         switch (head->type) {
2690                         case TOMOYO_DOMAINPOLICY:
2691                         case TOMOYO_EXCEPTIONPOLICY:
2692                         case TOMOYO_STAT:
2693                         case TOMOYO_PROFILE:
2694                         case TOMOYO_MANAGER:
2695                                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2696                                 break;
2697                         default:
2698                                 break;
2699                         }
2700                         break;
2701                 }
2702         }
2703 out:
2704         tomoyo_read_unlock(idx);
2705         mutex_unlock(&head->io_sem);
2706         return error;
2707 }
2708
2709 /**
2710  * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2711  *
2712  * @head: Pointer to "struct tomoyo_io_buffer".
2713  *
2714  * Returns 0.
2715  */
2716 int tomoyo_close_control(struct tomoyo_io_buffer *head)
2717 {
2718         /*
2719          * If the file is /sys/kernel/security/tomoyo/query , decrement the
2720          * observer counter.
2721          */
2722         if (head->type == TOMOYO_QUERY &&
2723             atomic_dec_and_test(&tomoyo_query_observers))
2724                 wake_up_all(&tomoyo_answer_wait);
2725         tomoyo_notify_gc(head, false);
2726         return 0;
2727 }
2728
2729 /**
2730  * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2731  */
2732 void tomoyo_check_profile(void)
2733 {
2734         struct tomoyo_domain_info *domain;
2735         const int idx = tomoyo_read_lock();
2736         tomoyo_policy_loaded = true;
2737         printk(KERN_INFO "TOMOYO: 2.5.0\n");
2738         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2739                 const u8 profile = domain->profile;
2740                 const struct tomoyo_policy_namespace *ns = domain->ns;
2741                 if (ns->profile_version != 20110903)
2742                         printk(KERN_ERR
2743                                "Profile version %u is not supported.\n",
2744                                ns->profile_version);
2745                 else if (!ns->profile_ptr[profile])
2746                         printk(KERN_ERR
2747                                "Profile %u (used by '%s') is not defined.\n",
2748                                profile, domain->domainname->name);
2749                 else
2750                         continue;
2751                 printk(KERN_ERR
2752                        "Userland tools for TOMOYO 2.5 must be installed and "
2753                        "policy must be initialized.\n");
2754                 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.5/ "
2755                        "for more information.\n");
2756                 panic("STOP!");
2757         }
2758         tomoyo_read_unlock(idx);
2759         printk(KERN_INFO "Mandatory Access Control activated.\n");
2760 }
2761
2762 /**
2763  * tomoyo_load_builtin_policy - Load built-in policy.
2764  *
2765  * Returns nothing.
2766  */
2767 void __init tomoyo_load_builtin_policy(void)
2768 {
2769         /*
2770          * This include file is manually created and contains built-in policy
2771          * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2772          * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2773          * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2774          */
2775 #include "builtin-policy.h"
2776         u8 i;
2777         const int idx = tomoyo_read_lock();
2778         for (i = 0; i < 5; i++) {
2779                 struct tomoyo_io_buffer head = { };
2780                 char *start = "";
2781                 switch (i) {
2782                 case 0:
2783                         start = tomoyo_builtin_profile;
2784                         head.type = TOMOYO_PROFILE;
2785                         head.write = tomoyo_write_profile;
2786                         break;
2787                 case 1:
2788                         start = tomoyo_builtin_exception_policy;
2789                         head.type = TOMOYO_EXCEPTIONPOLICY;
2790                         head.write = tomoyo_write_exception;
2791                         break;
2792                 case 2:
2793                         start = tomoyo_builtin_domain_policy;
2794                         head.type = TOMOYO_DOMAINPOLICY;
2795                         head.write = tomoyo_write_domain;
2796                         break;
2797                 case 3:
2798                         start = tomoyo_builtin_manager;
2799                         head.type = TOMOYO_MANAGER;
2800                         head.write = tomoyo_write_manager;
2801                         break;
2802                 case 4:
2803                         start = tomoyo_builtin_stat;
2804                         head.type = TOMOYO_STAT;
2805                         head.write = tomoyo_write_stat;
2806                         break;
2807                 }
2808                 while (1) {
2809                         char *end = strchr(start, '\n');
2810                         if (!end)
2811                                 break;
2812                         *end = '\0';
2813                         tomoyo_normalize_line(start);
2814                         head.write_buf = start;
2815                         tomoyo_parse_policy(&head, start);
2816                         start = end + 1;
2817                 }
2818         }
2819         tomoyo_read_unlock(idx);
2820 #ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2821         tomoyo_check_profile();
2822 #endif
2823 }