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