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