security/tomoyo/common.c

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