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                         return;
 753                 head->r.step++;
 754                 break;
 755         case 2:
 756                 {
 757                         u8 i;
 758                         const struct tomoyo_path_info *comment =
 759                                 profile->comment;
 760                         tomoyo_print_namespace(head);
 761                         tomoyo_io_printf(head, "%u-COMMENT=", index);
 762                         tomoyo_set_string(head, comment ? comment->name : "");
 763                         tomoyo_set_lf(head);
 764                         tomoyo_io_printf(head, "%u-PREFERENCE={ ", index);
 765                         for (i = 0; i < TOMOYO_MAX_PREF; i++)
 766                                 tomoyo_io_printf(head, "%s=%u ",
 767                                                  tomoyo_pref_keywords[i],
 768                                                  profile->pref[i]);
 769                         tomoyo_set_string(head, "}\n");
 770                         head->r.step++;
 771                 }
 772                 break;
 773         case 3:
 774                 {
 775                         tomoyo_print_namespace(head);
 776                         tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
 777                         tomoyo_print_config(head, profile->default_config);
 778                         head->r.bit = 0;
 779                         head->r.step++;
 780                 }
 781                 break;
 782         case 4:
 783                 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
 784                               + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
 785                         const u8 i = head->r.bit;
 786                         const u8 config = profile->config[i];
 787                         if (config == TOMOYO_CONFIG_USE_DEFAULT)
 788                                 continue;
 789                         tomoyo_print_namespace(head);
 790                         if (i < TOMOYO_MAX_MAC_INDEX)
 791                                 tomoyo_io_printf(head, "%u-CONFIG::%s::%s",
 792                                                  index,
 793                                                  tomoyo_category_keywords
 794                                                  [tomoyo_index2category[i]],
 795                                                  tomoyo_mac_keywords[i]);
 796                         else
 797                                 tomoyo_io_printf(head, "%u-CONFIG::%s", index,
 798                                                  tomoyo_mac_keywords[i]);
 799                         tomoyo_print_config(head, config);
 800                         head->r.bit++;
 801                         break;
 802                 }
 803                 if (head->r.bit == TOMOYO_MAX_MAC_INDEX
 804                     + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
 805                         head->r.index++;
 806                         head->r.step = 1;
 807                 }
 808                 break;
 809         }
 810         if (tomoyo_flush(head))
 811                 goto next;
 812 }
 813
 814 /**
 815  * tomoyo_same_manager - Check for duplicated "struct tomoyo_manager" entry.
 816  *
 817  * @a: Pointer to "struct tomoyo_acl_head".
 818  * @b: Pointer to "struct tomoyo_acl_head".
 819  *
 820  * Returns true if @a == @b, false otherwise.
 821  */
 822 static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
 823                                 const struct tomoyo_acl_head *b)
 824 {
 825         return container_of(a, struct tomoyo_manager, head)->manager ==
 826                 container_of(b, struct tomoyo_manager, head)->manager;
 827 }
 828
 829 /**
 830  * tomoyo_update_manager_entry - Add a manager entry.
 831  *
 832  * @manager:   The path to manager or the domainnamme.
 833  * @is_delete: True if it is a delete request.
 834  *
 835  * Returns 0 on success, negative value otherwise.
 836  *
 837  * Caller holds tomoyo_read_lock().
 838  */
 839 static int tomoyo_update_manager_entry(const char *manager,
 840                                        const bool is_delete)
 841 {
 842         struct tomoyo_manager e = { };
 843         struct tomoyo_acl_param param = {
 844                 /* .ns = &tomoyo_kernel_namespace, */
 845                 .is_delete = is_delete,
 846                 .list = &tomoyo_kernel_namespace.
 847                 policy_list[TOMOYO_ID_MANAGER],
 848         };
 849         int error = is_delete ? -ENOENT : -ENOMEM;
 850         if (tomoyo_domain_def(manager)) {
 851                 if (!tomoyo_correct_domain(manager))
 852                         return -EINVAL;
 853                 e.is_domain = true;
 854         } else {
 855                 if (!tomoyo_correct_path(manager))
 856                         return -EINVAL;
 857         }
 858         e.manager = tomoyo_get_name(manager);
 859         if (e.manager) {
 860                 error = tomoyo_update_policy(&e.head, sizeof(e), &param,
 861                                              tomoyo_same_manager);
 862                 tomoyo_put_name(e.manager);
 863         }
 864         return error;
 865 }
 866
 867 /**
 868  * tomoyo_write_manager - Write manager policy.
 869  *
 870  * @head: Pointer to "struct tomoyo_io_buffer".
 871  *
 872  * Returns 0 on success, negative value otherwise.
 873  *
 874  * Caller holds tomoyo_read_lock().
 875  */
 876 static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
 877 {
 878         char *data = head->write_buf;
 879
 880         if (!strcmp(data, "manage_by_non_root")) {
 881                 tomoyo_manage_by_non_root = !head->w.is_delete;
 882                 return 0;
 883         }
 884         return tomoyo_update_manager_entry(data, head->w.is_delete);
 885 }
 886
 887 /**
 888  * tomoyo_read_manager - Read manager policy.
 889  *
 890  * @head: Pointer to "struct tomoyo_io_buffer".
 891  *
 892  * Caller holds tomoyo_read_lock().
 893  */
 894 static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
 895 {
 896         if (head->r.eof)
 897                 return;
 898         list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.
 899                              policy_list[TOMOYO_ID_MANAGER]) {
 900                 struct tomoyo_manager *ptr =
 901                         list_entry(head->r.acl, typeof(*ptr), head.list);
 902                 if (ptr->head.is_deleted)
 903                         continue;
 904                 if (!tomoyo_flush(head))
 905                         return;
 906                 tomoyo_set_string(head, ptr->manager->name);
 907                 tomoyo_set_lf(head);
 908         }
 909         head->r.eof = true;
 910 }
 911
 912 /**
 913  * tomoyo_manager - Check whether the current process is a policy manager.
 914  *
 915  * Returns true if the current process is permitted to modify policy
 916  * via /sys/kernel/security/tomoyo/ interface.
 917  *
 918  * Caller holds tomoyo_read_lock().
 919  */
 920 static bool tomoyo_manager(void)
 921 {
 922         struct tomoyo_manager *ptr;
 923         const char *exe;
 924         const struct task_struct *task = current;
 925         const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
 926         bool found = false;
 927
 928         if (!tomoyo_policy_loaded)
 929                 return true;
 930         if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
 931                 return false;
 932         list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
 933                                 policy_list[TOMOYO_ID_MANAGER], head.list) {
 934                 if (!ptr->head.is_deleted && ptr->is_domain
 935                     && !tomoyo_pathcmp(domainname, ptr->manager)) {
 936                         found = true;
 937                         break;
 938                 }
 939         }
 940         if (found)
 941                 return true;
 942         exe = tomoyo_get_exe();
 943         if (!exe)
 944                 return false;
 945         list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
 946                                 policy_list[TOMOYO_ID_MANAGER], head.list) {
 947                 if (!ptr->head.is_deleted && !ptr->is_domain
 948                     && !strcmp(exe, ptr->manager->name)) {
 949                         found = true;
 950                         break;
 951                 }
 952         }
 953         if (!found) { /* Reduce error messages. */
 954                 static pid_t last_pid;
 955                 const pid_t pid = current->pid;
 956                 if (last_pid != pid) {
 957                         printk(KERN_WARNING "%s ( %s ) is not permitted to "
 958                                "update policies.\n", domainname->name, exe);
 959                         last_pid = pid;
 960                 }
 961         }
 962         kfree(exe);
 963         return found;
 964 }
 965
 966 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
 967 (unsigned int serial);
 968
 969 /**
 970  * tomoyo_select_domain - Parse select command.
 971  *
 972  * @head: Pointer to "struct tomoyo_io_buffer".
 973  * @data: String to parse.
 974  *
 975  * Returns true on success, false otherwise.
 976  *
 977  * Caller holds tomoyo_read_lock().
 978  */
 979 static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
 980                                  const char *data)
 981 {
 982         unsigned int pid;
 983         struct tomoyo_domain_info *domain = NULL;
 984         bool global_pid = false;
 985         if (strncmp(data, "select ", 7))
 986                 return false;
 987         data += 7;
 988         if (sscanf(data, "pid=%u", &pid) == 1 ||
 989             (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
 990                 struct task_struct *p;
 991                 rcu_read_lock();
 992                 if (global_pid)
 993                         p = find_task_by_pid_ns(pid, &init_pid_ns);
 994                 else
 995                         p = find_task_by_vpid(pid);
 996                 if (p)
 997                         domain = tomoyo_real_domain(p);
 998                 rcu_read_unlock();
 999         } else if (!strncmp(data, "domain=", 7)) {
1000                 if (tomoyo_domain_def(data + 7))
1001                         domain = tomoyo_find_domain(data + 7);
1002         } else if (sscanf(data, "Q=%u", &pid) == 1) {
1003                 domain = tomoyo_find_domain_by_qid(pid);
1004         } else
1005                 return false;
1006         head->w.domain = domain;
1007         /* Accessing read_buf is safe because head->io_sem is held. */
1008         if (!head->read_buf)
1009                 return true; /* Do nothing if open(O_WRONLY). */
1010         memset(&head->r, 0, sizeof(head->r));
1011         head->r.print_this_domain_only = true;
1012         if (domain)
1013                 head->r.domain = &domain->list;
1014         else
1015                 head->r.eof = 1;
1016         tomoyo_io_printf(head, "# select %s\n", data);
1017         if (domain && domain->is_deleted)
1018                 tomoyo_io_printf(head, "# This is a deleted domain.\n");
1019         return true;
1020 }
1021
1022 /**
1023  * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry.
1024  *
1025  * @a: Pointer to "struct tomoyo_acl_info".
1026  * @b: Pointer to "struct tomoyo_acl_info".
1027  *
1028  * Returns true if @a == @b, false otherwise.
1029  */
1030 static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a,
1031                               const struct tomoyo_acl_info *b)
1032 {
1033         const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head);
1034         const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head);
1035         return p1->domainname == p2->domainname;
1036 }
1037
1038 /**
1039  * tomoyo_write_task - Update task related list.
1040  *
1041  * @param: Pointer to "struct tomoyo_acl_param".
1042  *
1043  * Returns 0 on success, negative value otherwise.
1044  *
1045  * Caller holds tomoyo_read_lock().
1046  */
1047 static int tomoyo_write_task(struct tomoyo_acl_param *param)
1048 {
1049         int error = -EINVAL;
1050         if (tomoyo_str_starts(&param->data, "manual_domain_transition ")) {
1051                 struct tomoyo_task_acl e = {
1052                         .head.type = TOMOYO_TYPE_MANUAL_TASK_ACL,
1053                         .domainname = tomoyo_get_domainname(param),
1054                 };
1055                 if (e.domainname)
1056                         error = tomoyo_update_domain(&e.head, sizeof(e), param,
1057                                                      tomoyo_same_task_acl,
1058                                                      NULL);
1059                 tomoyo_put_name(e.domainname);
1060         }
1061         return error;
1062 }
1063
1064 /**
1065  * tomoyo_delete_domain - Delete a domain.
1066  *
1067  * @domainname: The name of domain.
1068  *
1069  * Returns 0.
1070  *
1071  * Caller holds tomoyo_read_lock().
1072  */
1073 static int tomoyo_delete_domain(char *domainname)
1074 {
1075         struct tomoyo_domain_info *domain;
1076         struct tomoyo_path_info name;
1077
1078         name.name = domainname;
1079         tomoyo_fill_path_info(&name);
1080         if (mutex_lock_interruptible(&tomoyo_policy_lock))
1081                 return 0;
1082         /* Is there an active domain? */
1083         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1084                 /* Never delete tomoyo_kernel_domain */
1085                 if (domain == &tomoyo_kernel_domain)
1086                         continue;
1087                 if (domain->is_deleted ||
1088                     tomoyo_pathcmp(domain->domainname, &name))
1089                         continue;
1090                 domain->is_deleted = true;
1091                 break;
1092         }
1093         mutex_unlock(&tomoyo_policy_lock);
1094         return 0;
1095 }
1096
1097 /**
1098  * tomoyo_write_domain2 - Write domain policy.
1099  *
1100  * @ns:        Pointer to "struct tomoyo_policy_namespace".
1101  * @list:      Pointer to "struct list_head".
1102  * @data:      Policy to be interpreted.
1103  * @is_delete: True if it is a delete request.
1104  *
1105  * Returns 0 on success, negative value otherwise.
1106  *
1107  * Caller holds tomoyo_read_lock().
1108  */
1109 static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
1110                                 struct list_head *list, char *data,
1111                                 const bool is_delete)
1112 {
1113         struct tomoyo_acl_param param = {
1114                 .ns = ns,
1115                 .list = list,
1116                 .data = data,
1117                 .is_delete = is_delete,
1118         };
1119         static const struct {
1120                 const char *keyword;
1121                 int (*write) (struct tomoyo_acl_param *);
1122         } tomoyo_callback[5] = {
1123                 { "file ", tomoyo_write_file },
1124                 { "network inet ", tomoyo_write_inet_network },
1125                 { "network unix ", tomoyo_write_unix_network },
1126                 { "misc ", tomoyo_write_misc },
1127                 { "task ", tomoyo_write_task },
1128         };
1129         u8 i;
1130
1131         for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) {
1132                 if (!tomoyo_str_starts(&param.data,
1133                                        tomoyo_callback[i].keyword))
1134                         continue;
1135                 return tomoyo_callback[i].write(&param);
1136         }
1137         return -EINVAL;
1138 }
1139
1140 /* String table for domain flags. */
1141 const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1142         [TOMOYO_DIF_QUOTA_WARNED]      = "quota_exceeded\n",
1143         [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1144 };
1145
1146 /**
1147  * tomoyo_write_domain - Write domain policy.
1148  *
1149  * @head: Pointer to "struct tomoyo_io_buffer".
1150  *
1151  * Returns 0 on success, negative value otherwise.
1152  *
1153  * Caller holds tomoyo_read_lock().
1154  */
1155 static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1156 {
1157         char *data = head->write_buf;
1158         struct tomoyo_policy_namespace *ns;
1159         struct tomoyo_domain_info *domain = head->w.domain;
1160         const bool is_delete = head->w.is_delete;
1161         bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1162         unsigned int profile;
1163         if (*data == '<') {
1164                 domain = NULL;
1165                 if (is_delete)
1166                         tomoyo_delete_domain(data);
1167                 else if (is_select)
1168                         domain = tomoyo_find_domain(data);
1169                 else
1170                         domain = tomoyo_assign_domain(data, false);
1171                 head->w.domain = domain;
1172                 return 0;
1173         }
1174         if (!domain)
1175                 return -EINVAL;
1176         ns = domain->ns;
1177         if (sscanf(data, "use_profile %u", &profile) == 1
1178             && profile < TOMOYO_MAX_PROFILES) {
1179                 if (!tomoyo_policy_loaded || ns->profile_ptr[profile])
1180                         domain->profile = (u8) profile;
1181                 return 0;
1182         }
1183         if (sscanf(data, "use_group %u\n", &profile) == 1
1184             && profile < TOMOYO_MAX_ACL_GROUPS) {
1185                 if (!is_delete)
1186                         domain->group = (u8) profile;
1187                 return 0;
1188         }
1189         for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) {
1190                 const char *cp = tomoyo_dif[profile];
1191                 if (strncmp(data, cp, strlen(cp) - 1))
1192                         continue;
1193                 domain->flags[profile] = !is_delete;
1194                 return 0;
1195         }
1196         return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1197                                     is_delete);
1198 }
1199
1200 /**
1201  * tomoyo_print_condition - Print condition part.
1202  *
1203  * @head: Pointer to "struct tomoyo_io_buffer".
1204  * @cond: Pointer to "struct tomoyo_condition".
1205  *
1206  * Returns true on success, false otherwise.
1207  */
1208 static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1209                                    const struct tomoyo_condition *cond)
1210 {
1211         switch (head->r.cond_step) {
1212         case 0:
1213                 head->r.cond_index = 0;
1214                 head->r.cond_step++;
1215                 if (cond->transit) {
1216                         tomoyo_set_space(head);
1217                         tomoyo_set_string(head, cond->transit->name);
1218                 }
1219                 /* fall through */
1220         case 1:
1221                 {
1222                         const u16 condc = cond->condc;
1223                         const struct tomoyo_condition_element *condp =
1224                                 (typeof(condp)) (cond + 1);
1225                         const struct tomoyo_number_union *numbers_p =
1226                                 (typeof(numbers_p)) (condp + condc);
1227                         const struct tomoyo_name_union *names_p =
1228                                 (typeof(names_p))
1229                                 (numbers_p + cond->numbers_count);
1230                         const struct tomoyo_argv *argv =
1231                                 (typeof(argv)) (names_p + cond->names_count);
1232                         const struct tomoyo_envp *envp =
1233                                 (typeof(envp)) (argv + cond->argc);
1234                         u16 skip;
1235                         for (skip = 0; skip < head->r.cond_index; skip++) {
1236                                 const u8 left = condp->left;
1237                                 const u8 right = condp->right;
1238                                 condp++;
1239                                 switch (left) {
1240                                 case TOMOYO_ARGV_ENTRY:
1241                                         argv++;
1242                                         continue;
1243                                 case TOMOYO_ENVP_ENTRY:
1244                                         envp++;
1245                                         continue;
1246                                 case TOMOYO_NUMBER_UNION:
1247                                         numbers_p++;
1248                                         break;
1249                                 }
1250                                 switch (right) {
1251                                 case TOMOYO_NAME_UNION:
1252                                         names_p++;
1253                                         break;
1254                                 case TOMOYO_NUMBER_UNION:
1255                                         numbers_p++;
1256                                         break;
1257                                 }
1258                         }
1259                         while (head->r.cond_index < condc) {
1260                                 const u8 match = condp->equals;
1261                                 const u8 left = condp->left;
1262                                 const u8 right = condp->right;
1263                                 if (!tomoyo_flush(head))
1264                                         return false;
1265                                 condp++;
1266                                 head->r.cond_index++;
1267                                 tomoyo_set_space(head);
1268                                 switch (left) {
1269                                 case TOMOYO_ARGV_ENTRY:
1270                                         tomoyo_io_printf(head,
1271                                                          "exec.argv[%lu]%s=\"",
1272                                                          argv->index, argv->
1273                                                          is_not ? "!" : "");
1274                                         tomoyo_set_string(head,
1275                                                           argv->value->name);
1276                                         tomoyo_set_string(head, "\"");
1277                                         argv++;
1278                                         continue;
1279                                 case TOMOYO_ENVP_ENTRY:
1280                                         tomoyo_set_string(head,
1281                                                           "exec.envp[\"");
1282                                         tomoyo_set_string(head,
1283                                                           envp->name->name);
1284                                         tomoyo_io_printf(head, "\"]%s=", envp->
1285                                                          is_not ? "!" : "");
1286                                         if (envp->value) {
1287                                                 tomoyo_set_string(head, "\"");
1288                                                 tomoyo_set_string(head, envp->
1289                                                                   value->name);
1290                                                 tomoyo_set_string(head, "\"");
1291                                         } else {
1292                                                 tomoyo_set_string(head,
1293                                                                   "NULL");
1294                                         }
1295                                         envp++;
1296                                         continue;
1297                                 case TOMOYO_NUMBER_UNION:
1298                                         tomoyo_print_number_union_nospace
1299                                                 (head, numbers_p++);
1300                                         break;
1301                                 default:
1302                                         tomoyo_set_string(head,
1303                                                tomoyo_condition_keyword[left]);
1304                                         break;
1305                                 }
1306                                 tomoyo_set_string(head, match ? "=" : "!=");
1307                                 switch (right) {
1308                                 case TOMOYO_NAME_UNION:
1309                                         tomoyo_print_name_union_quoted
1310                                                 (head, names_p++);
1311                                         break;
1312                                 case TOMOYO_NUMBER_UNION:
1313                                         tomoyo_print_number_union_nospace
1314                                                 (head, numbers_p++);
1315                                         break;
1316                                 default:
1317                                         tomoyo_set_string(head,
1318                                           tomoyo_condition_keyword[right]);
1319                                         break;
1320                                 }
1321                         }
1322                 }
1323                 head->r.cond_step++;
1324                 /* fall through */
1325         case 2:
1326                 if (!tomoyo_flush(head))
1327                         break;
1328                 head->r.cond_step++;
1329                 /* fall through */
1330         case 3:
1331                 if (cond->grant_log != TOMOYO_GRANTLOG_AUTO)
1332                         tomoyo_io_printf(head, " grant_log=%s",
1333                                          tomoyo_yesno(cond->grant_log ==
1334                                                       TOMOYO_GRANTLOG_YES));
1335                 tomoyo_set_lf(head);
1336                 return true;
1337         }
1338         return false;
1339 }
1340
1341 /**
1342  * tomoyo_set_group - Print "acl_group " header keyword and category name.
1343  *
1344  * @head:     Pointer to "struct tomoyo_io_buffer".
1345  * @category: Category name.
1346  *
1347  * Returns nothing.
1348  */
1349 static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1350                              const char *category)
1351 {
1352         if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1353                 tomoyo_print_namespace(head);
1354                 tomoyo_io_printf(head, "acl_group %u ",
1355                                  head->r.acl_group_index);
1356         }
1357         tomoyo_set_string(head, category);
1358 }
1359
1360 /**
1361  * tomoyo_print_entry - Print an ACL entry.
1362  *
1363  * @head: Pointer to "struct tomoyo_io_buffer".
1364  * @acl:  Pointer to an ACL entry.
1365  *
1366  * Returns true on success, false otherwise.
1367  */
1368 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1369                                struct tomoyo_acl_info *acl)
1370 {
1371         const u8 acl_type = acl->type;
1372         bool first = true;
1373         u8 bit;
1374
1375         if (head->r.print_cond_part)
1376                 goto print_cond_part;
1377         if (acl->is_deleted)
1378                 return true;
1379         if (!tomoyo_flush(head))
1380                 return false;
1381         else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1382                 struct tomoyo_path_acl *ptr =
1383                         container_of(acl, typeof(*ptr), head);
1384                 const u16 perm = ptr->perm;
1385                 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1386                         if (!(perm & (1 << bit)))
1387                                 continue;
1388                         if (head->r.print_transition_related_only &&
1389                             bit != TOMOYO_TYPE_EXECUTE)
1390                                 continue;
1391                         if (first) {
1392                                 tomoyo_set_group(head, "file ");
1393                                 first = false;
1394                         } else {
1395                                 tomoyo_set_slash(head);
1396                         }
1397                         tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1398                 }
1399                 if (first)
1400                         return true;
1401                 tomoyo_print_name_union(head, &ptr->name);
1402         } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) {
1403                 struct tomoyo_task_acl *ptr =
1404                         container_of(acl, typeof(*ptr), head);
1405                 tomoyo_set_group(head, "task ");
1406                 tomoyo_set_string(head, "manual_domain_transition ");
1407                 tomoyo_set_string(head, ptr->domainname->name);
1408         } else if (head->r.print_transition_related_only) {
1409                 return true;
1410         } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1411                 struct tomoyo_path2_acl *ptr =
1412                         container_of(acl, typeof(*ptr), head);
1413                 const u8 perm = ptr->perm;
1414                 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1415                         if (!(perm & (1 << bit)))
1416                                 continue;
1417                         if (first) {
1418                                 tomoyo_set_group(head, "file ");
1419                                 first = false;
1420                         } else {
1421                                 tomoyo_set_slash(head);
1422                         }
1423                         tomoyo_set_string(head, tomoyo_mac_keywords
1424                                           [tomoyo_pp2mac[bit]]);
1425                 }
1426                 if (first)
1427                         return true;
1428                 tomoyo_print_name_union(head, &ptr->name1);
1429                 tomoyo_print_name_union(head, &ptr->name2);
1430         } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1431                 struct tomoyo_path_number_acl *ptr =
1432                         container_of(acl, typeof(*ptr), head);
1433                 const u8 perm = ptr->perm;
1434                 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1435                         if (!(perm & (1 << bit)))
1436                                 continue;
1437                         if (first) {
1438                                 tomoyo_set_group(head, "file ");
1439                                 first = false;
1440                         } else {
1441                                 tomoyo_set_slash(head);
1442                         }
1443                         tomoyo_set_string(head, tomoyo_mac_keywords
1444                                           [tomoyo_pn2mac[bit]]);
1445                 }
1446                 if (first)
1447                         return true;
1448                 tomoyo_print_name_union(head, &ptr->name);
1449                 tomoyo_print_number_union(head, &ptr->number);
1450         } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1451                 struct tomoyo_mkdev_acl *ptr =
1452                         container_of(acl, typeof(*ptr), head);
1453                 const u8 perm = ptr->perm;
1454                 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1455                         if (!(perm & (1 << bit)))
1456                                 continue;
1457                         if (first) {
1458                                 tomoyo_set_group(head, "file ");
1459                                 first = false;
1460                         } else {
1461                                 tomoyo_set_slash(head);
1462                         }
1463                         tomoyo_set_string(head, tomoyo_mac_keywords
1464                                           [tomoyo_pnnn2mac[bit]]);
1465                 }
1466                 if (first)
1467                         return true;
1468                 tomoyo_print_name_union(head, &ptr->name);
1469                 tomoyo_print_number_union(head, &ptr->mode);
1470                 tomoyo_print_number_union(head, &ptr->major);
1471                 tomoyo_print_number_union(head, &ptr->minor);
1472         } else if (acl_type == TOMOYO_TYPE_INET_ACL) {
1473                 struct tomoyo_inet_acl *ptr =
1474                         container_of(acl, typeof(*ptr), head);
1475                 const u8 perm = ptr->perm;
1476
1477                 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1478                         if (!(perm & (1 << bit)))
1479                                 continue;
1480                         if (first) {
1481                                 tomoyo_set_group(head, "network inet ");
1482                                 tomoyo_set_string(head, tomoyo_proto_keyword
1483                                                   [ptr->protocol]);
1484                                 tomoyo_set_space(head);
1485                                 first = false;
1486                         } else {
1487                                 tomoyo_set_slash(head);
1488                         }
1489                         tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1490                 }
1491                 if (first)
1492                         return true;
1493                 tomoyo_set_space(head);
1494                 if (ptr->address.group) {
1495                         tomoyo_set_string(head, "@");
1496                         tomoyo_set_string(head, ptr->address.group->group_name
1497                                           ->name);
1498                 } else {
1499                         char buf[128];
1500                         tomoyo_print_ip(buf, sizeof(buf), &ptr->address);
1501                         tomoyo_io_printf(head, "%s", buf);
1502                 }
1503                 tomoyo_print_number_union(head, &ptr->port);
1504         } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) {
1505                 struct tomoyo_unix_acl *ptr =
1506                         container_of(acl, typeof(*ptr), head);
1507                 const u8 perm = ptr->perm;
1508
1509                 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1510                         if (!(perm & (1 << bit)))
1511                                 continue;
1512                         if (first) {
1513                                 tomoyo_set_group(head, "network unix ");
1514                                 tomoyo_set_string(head, tomoyo_proto_keyword
1515                                                   [ptr->protocol]);
1516                                 tomoyo_set_space(head);
1517                                 first = false;
1518                         } else {
1519                                 tomoyo_set_slash(head);
1520                         }
1521                         tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1522                 }
1523                 if (first)
1524                         return true;
1525                 tomoyo_print_name_union(head, &ptr->name);
1526         } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1527                 struct tomoyo_mount_acl *ptr =
1528                         container_of(acl, typeof(*ptr), head);
1529                 tomoyo_set_group(head, "file mount");
1530                 tomoyo_print_name_union(head, &ptr->dev_name);
1531                 tomoyo_print_name_union(head, &ptr->dir_name);
1532                 tomoyo_print_name_union(head, &ptr->fs_type);
1533                 tomoyo_print_number_union(head, &ptr->flags);
1534         } else if (acl_type == TOMOYO_TYPE_ENV_ACL) {
1535                 struct tomoyo_env_acl *ptr =
1536                         container_of(acl, typeof(*ptr), head);
1537
1538                 tomoyo_set_group(head, "misc env ");
1539                 tomoyo_set_string(head, ptr->env->name);
1540         }
1541         if (acl->cond) {
1542                 head->r.print_cond_part = true;
1543                 head->r.cond_step = 0;
1544                 if (!tomoyo_flush(head))
1545                         return false;
1546 print_cond_part:
1547                 if (!tomoyo_print_condition(head, acl->cond))
1548                         return false;
1549                 head->r.print_cond_part = false;
1550         } else {
1551                 tomoyo_set_lf(head);
1552         }
1553         return true;
1554 }
1555
1556 /**
1557  * tomoyo_read_domain2 - Read domain policy.
1558  *
1559  * @head: Pointer to "struct tomoyo_io_buffer".
1560  * @list: Pointer to "struct list_head".
1561  *
1562  * Caller holds tomoyo_read_lock().
1563  *
1564  * Returns true on success, false otherwise.
1565  */
1566 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1567                                 struct list_head *list)
1568 {
1569         list_for_each_cookie(head->r.acl, list) {
1570                 struct tomoyo_acl_info *ptr =
1571                         list_entry(head->r.acl, typeof(*ptr), list);
1572                 if (!tomoyo_print_entry(head, ptr))
1573                         return false;
1574         }
1575         head->r.acl = NULL;
1576         return true;
1577 }
1578
1579 /**
1580  * tomoyo_read_domain - Read domain policy.
1581  *
1582  * @head: Pointer to "struct tomoyo_io_buffer".
1583  *
1584  * Caller holds tomoyo_read_lock().
1585  */
1586 static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1587 {
1588         if (head->r.eof)
1589                 return;
1590         list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1591                 struct tomoyo_domain_info *domain =
1592                         list_entry(head->r.domain, typeof(*domain), list);
1593                 switch (head->r.step) {
1594                         u8 i;
1595                 case 0:
1596                         if (domain->is_deleted &&
1597                             !head->r.print_this_domain_only)
1598                                 continue;
1599                         /* Print domainname and flags. */
1600                         tomoyo_set_string(head, domain->domainname->name);
1601                         tomoyo_set_lf(head);
1602                         tomoyo_io_printf(head, "use_profile %u\n",
1603                                          domain->profile);
1604                         tomoyo_io_printf(head, "use_group %u\n",
1605                                          domain->group);
1606                         for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1607                                 if (domain->flags[i])
1608                                         tomoyo_set_string(head, tomoyo_dif[i]);
1609                         head->r.step++;
1610                         tomoyo_set_lf(head);
1611                         /* fall through */
1612                 case 1:
1613                         if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1614                                 return;
1615                         head->r.step++;
1616                         if (!tomoyo_set_lf(head))
1617                                 return;
1618                         /* fall through */
1619                 case 2:
1620                         head->r.step = 0;
1621                         if (head->r.print_this_domain_only)
1622                                 goto done;
1623                 }
1624         }
1625  done:
1626         head->r.eof = true;
1627 }
1628
1629 /**
1630  * tomoyo_write_pid: Specify PID to obtain domainname.
1631  *
1632  * @head: Pointer to "struct tomoyo_io_buffer".
1633  *
1634  * Returns 0.
1635  */
1636 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1637 {
1638         head->r.eof = false;
1639         return 0;
1640 }
1641
1642 /**
1643  * tomoyo_read_pid - Get domainname of the specified PID.
1644  *
1645  * @head: Pointer to "struct tomoyo_io_buffer".
1646  *
1647  * Returns the domainname which the specified PID is in on success,
1648  * empty string otherwise.
1649  * The PID is specified by tomoyo_write_pid() so that the user can obtain
1650  * using read()/write() interface rather than sysctl() interface.
1651  */
1652 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1653 {
1654         char *buf = head->write_buf;
1655         bool global_pid = false;
1656         unsigned int pid;
1657         struct task_struct *p;
1658         struct tomoyo_domain_info *domain = NULL;
1659
1660         /* Accessing write_buf is safe because head->io_sem is held. */
1661         if (!buf) {
1662                 head->r.eof = true;
1663                 return; /* Do nothing if open(O_RDONLY). */
1664         }
1665         if (head->r.w_pos || head->r.eof)
1666                 return;
1667         head->r.eof = true;
1668         if (tomoyo_str_starts(&buf, "global-pid "))
1669                 global_pid = true;
1670         pid = (unsigned int) simple_strtoul(buf, NULL, 10);
1671         rcu_read_lock();
1672         if (global_pid)
1673                 p = find_task_by_pid_ns(pid, &init_pid_ns);
1674         else
1675                 p = find_task_by_vpid(pid);
1676         if (p)
1677                 domain = tomoyo_real_domain(p);
1678         rcu_read_unlock();
1679         if (!domain)
1680                 return;
1681         tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1682         tomoyo_set_string(head, domain->domainname->name);
1683 }
1684
1685 /* String table for domain transition control keywords. */
1686 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1687         [TOMOYO_TRANSITION_CONTROL_NO_RESET]      = "no_reset_domain ",
1688         [TOMOYO_TRANSITION_CONTROL_RESET]         = "reset_domain ",
1689         [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1690         [TOMOYO_TRANSITION_CONTROL_INITIALIZE]    = "initialize_domain ",
1691         [TOMOYO_TRANSITION_CONTROL_NO_KEEP]       = "no_keep_domain ",
1692         [TOMOYO_TRANSITION_CONTROL_KEEP]          = "keep_domain ",
1693 };
1694
1695 /* String table for grouping keywords. */
1696 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1697         [TOMOYO_PATH_GROUP]    = "path_group ",
1698         [TOMOYO_NUMBER_GROUP]  = "number_group ",
1699         [TOMOYO_ADDRESS_GROUP] = "address_group ",
1700 };
1701
1702 /**
1703  * tomoyo_write_exception - Write exception policy.
1704  *
1705  * @head: Pointer to "struct tomoyo_io_buffer".
1706  *
1707  * Returns 0 on success, negative value otherwise.
1708  *
1709  * Caller holds tomoyo_read_lock().
1710  */
1711 static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1712 {
1713         const bool is_delete = head->w.is_delete;
1714         struct tomoyo_acl_param param = {
1715                 .ns = head->w.ns,
1716                 .is_delete = is_delete,
1717                 .data = head->write_buf,
1718         };
1719         u8 i;
1720         if (tomoyo_str_starts(&param.data, "aggregator "))
1721                 return tomoyo_write_aggregator(&param);
1722         for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1723                 if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
1724                         return tomoyo_write_transition_control(&param, i);
1725         for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1726                 if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
1727                         return tomoyo_write_group(&param, i);
1728         if (tomoyo_str_starts(&param.data, "acl_group ")) {
1729                 unsigned int group;
1730                 char *data;
1731                 group = simple_strtoul(param.data, &data, 10);
1732                 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1733                         return tomoyo_write_domain2
1734                                 (head->w.ns, &head->w.ns->acl_group[group],
1735                                  data, is_delete);
1736         }
1737         return -EINVAL;
1738 }
1739
1740 /**
1741  * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
1742  *
1743  * @head: Pointer to "struct tomoyo_io_buffer".
1744  * @idx:  Index number.
1745  *
1746  * Returns true on success, false otherwise.
1747  *
1748  * Caller holds tomoyo_read_lock().
1749  */
1750 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1751 {
1752         struct tomoyo_policy_namespace *ns =
1753                 container_of(head->r.ns, typeof(*ns), namespace_list);
1754         struct list_head *list = &ns->group_list[idx];
1755         list_for_each_cookie(head->r.group, list) {
1756                 struct tomoyo_group *group =
1757                         list_entry(head->r.group, typeof(*group), head.list);
1758                 list_for_each_cookie(head->r.acl, &group->member_list) {
1759                         struct tomoyo_acl_head *ptr =
1760                                 list_entry(head->r.acl, typeof(*ptr), list);
1761                         if (ptr->is_deleted)
1762                                 continue;
1763                         if (!tomoyo_flush(head))
1764                                 return false;
1765                         tomoyo_print_namespace(head);
1766                         tomoyo_set_string(head, tomoyo_group_name[idx]);
1767                         tomoyo_set_string(head, group->group_name->name);
1768                         if (idx == TOMOYO_PATH_GROUP) {
1769                                 tomoyo_set_space(head);
1770                                 tomoyo_set_string(head, container_of
1771                                                (ptr, struct tomoyo_path_group,
1772                                                 head)->member_name->name);
1773                         } else if (idx == TOMOYO_NUMBER_GROUP) {
1774                                 tomoyo_print_number_union(head, &container_of
1775                                                           (ptr,
1776                                                    struct tomoyo_number_group,
1777                                                            head)->number);
1778                         } else if (idx == TOMOYO_ADDRESS_GROUP) {
1779                                 char buffer[128];
1780
1781                                 struct tomoyo_address_group *member =
1782                                         container_of(ptr, typeof(*member),
1783                                                      head);
1784                                 tomoyo_print_ip(buffer, sizeof(buffer),
1785                                                 &member->address);
1786                                 tomoyo_io_printf(head, " %s", buffer);
1787                         }
1788                         tomoyo_set_lf(head);
1789                 }
1790                 head->r.acl = NULL;
1791         }
1792         head->r.group = NULL;
1793         return true;
1794 }
1795
1796 /**
1797  * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1798  *
1799  * @head: Pointer to "struct tomoyo_io_buffer".
1800  * @idx:  Index number.
1801  *
1802  * Returns true on success, false otherwise.
1803  *
1804  * Caller holds tomoyo_read_lock().
1805  */
1806 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1807 {
1808         struct tomoyo_policy_namespace *ns =
1809                 container_of(head->r.ns, typeof(*ns), namespace_list);
1810         struct list_head *list = &ns->policy_list[idx];
1811         list_for_each_cookie(head->r.acl, list) {
1812                 struct tomoyo_acl_head *acl =
1813                         container_of(head->r.acl, typeof(*acl), list);
1814                 if (acl->is_deleted)
1815                         continue;
1816                 if (!tomoyo_flush(head))
1817                         return false;
1818                 switch (idx) {
1819                 case TOMOYO_ID_TRANSITION_CONTROL:
1820                         {
1821                                 struct tomoyo_transition_control *ptr =
1822                                         container_of(acl, typeof(*ptr), head);
1823                                 tomoyo_print_namespace(head);
1824                                 tomoyo_set_string(head, tomoyo_transition_type
1825                                                   [ptr->type]);
1826                                 tomoyo_set_string(head, ptr->program ?
1827                                                   ptr->program->name : "any");
1828                                 tomoyo_set_string(head, " from ");
1829                                 tomoyo_set_string(head, ptr->domainname ?
1830                                                   ptr->domainname->name :
1831                                                   "any");
1832                         }
1833                         break;
1834                 case TOMOYO_ID_AGGREGATOR:
1835                         {
1836                                 struct tomoyo_aggregator *ptr =
1837                                         container_of(acl, typeof(*ptr), head);
1838                                 tomoyo_print_namespace(head);
1839                                 tomoyo_set_string(head, "aggregator ");
1840                                 tomoyo_set_string(head,
1841                                                   ptr->original_name->name);
1842                                 tomoyo_set_space(head);
1843                                 tomoyo_set_string(head,
1844                                                ptr->aggregated_name->name);
1845                         }
1846                         break;
1847                 default:
1848                         continue;
1849                 }
1850                 tomoyo_set_lf(head);
1851         }
1852         head->r.acl = NULL;
1853         return true;
1854 }
1855
1856 /**
1857  * tomoyo_read_exception - Read exception policy.
1858  *
1859  * @head: Pointer to "struct tomoyo_io_buffer".
1860  *
1861  * Caller holds tomoyo_read_lock().
1862  */
1863 static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1864 {
1865         struct tomoyo_policy_namespace *ns =
1866                 container_of(head->r.ns, typeof(*ns), namespace_list);
1867         if (head->r.eof)
1868                 return;
1869         while (head->r.step < TOMOYO_MAX_POLICY &&
1870                tomoyo_read_policy(head, head->r.step))
1871                 head->r.step++;
1872         if (head->r.step < TOMOYO_MAX_POLICY)
1873                 return;
1874         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1875                tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1876                 head->r.step++;
1877         if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1878                 return;
1879         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1880                + TOMOYO_MAX_ACL_GROUPS) {
1881                 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1882                         - TOMOYO_MAX_GROUP;
1883                 if (!tomoyo_read_domain2(head, &ns->acl_group
1884                                          [head->r.acl_group_index]))
1885                         return;
1886                 head->r.step++;
1887         }
1888         head->r.eof = true;
1889 }
1890
1891 /* Wait queue for kernel -> userspace notification. */
1892 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1893 /* Wait queue for userspace -> kernel notification. */
1894 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1895
1896 /* Structure for query. */
1897 struct tomoyo_query {
1898         struct list_head list;
1899         struct tomoyo_domain_info *domain;
1900         char *query;
1901         size_t query_len;
1902         unsigned int serial;
1903         u8 timer;
1904         u8 answer;
1905         u8 retry;
1906 };
1907
1908 /* The list for "struct tomoyo_query". */
1909 static LIST_HEAD(tomoyo_query_list);
1910
1911 /* Lock for manipulating tomoyo_query_list. */
1912 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1913
1914 /*
1915  * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1916  * interface.
1917  */
1918 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1919
1920 /**
1921  * tomoyo_truncate - Truncate a line.
1922  *
1923  * @str: String to truncate.
1924  *
1925  * Returns length of truncated @str.
1926  */
1927 static int tomoyo_truncate(char *str)
1928 {
1929         char *start = str;
1930         while (*(unsigned char *) str > (unsigned char) ' ')
1931                 str++;
1932         *str = '\0';
1933         return strlen(start) + 1;
1934 }
1935
1936 /**
1937  * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1938  *
1939  * @domain: Pointer to "struct tomoyo_domain_info".
1940  * @header: Lines containing ACL.
1941  *
1942  * Returns nothing.
1943  */
1944 static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
1945 {
1946         char *buffer;
1947         char *realpath = NULL;
1948         char *argv0 = NULL;
1949         char *symlink = NULL;
1950         char *cp = strchr(header, '\n');
1951         int len;
1952         if (!cp)
1953                 return;
1954         cp = strchr(cp + 1, '\n');
1955         if (!cp)
1956                 return;
1957         *cp++ = '\0';
1958         len = strlen(cp) + 1;
1959         /* strstr() will return NULL if ordering is wrong. */
1960         if (*cp == 'f') {
1961                 argv0 = strstr(header, " argv[]={ \"");
1962                 if (argv0) {
1963                         argv0 += 10;
1964                         len += tomoyo_truncate(argv0) + 14;
1965                 }
1966                 realpath = strstr(header, " exec={ realpath=\"");
1967                 if (realpath) {
1968                         realpath += 8;
1969                         len += tomoyo_truncate(realpath) + 6;
1970                 }
1971                 symlink = strstr(header, " symlink.target=\"");
1972                 if (symlink)
1973                         len += tomoyo_truncate(symlink + 1) + 1;
1974         }
1975         buffer = kmalloc(len, GFP_NOFS);
1976         if (!buffer)
1977                 return;
1978         snprintf(buffer, len - 1, "%s", cp);
1979         if (realpath)
1980                 tomoyo_addprintf(buffer, len, " exec.%s", realpath);
1981         if (argv0)
1982                 tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
1983         if (symlink)
1984                 tomoyo_addprintf(buffer, len, "%s", symlink);
1985         tomoyo_normalize_line(buffer);
1986         if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
1987                                   false))
1988                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
1989         kfree(buffer);
1990 }
1991
1992 /**
1993  * tomoyo_supervisor - Ask for the supervisor's decision.
1994  *
1995  * @r:   Pointer to "struct tomoyo_request_info".
1996  * @fmt: The printf()'s format string, followed by parameters.
1997  *
1998  * Returns 0 if the supervisor decided to permit the access request which
1999  * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
2000  * supervisor decided to retry the access request which violated the policy in
2001  * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
2002  */
2003 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
2004 {
2005         va_list args;
2006         int error;
2007         int len;
2008         static unsigned int tomoyo_serial;
2009         struct tomoyo_query entry = { };
2010         bool quota_exceeded = false;
2011         va_start(args, fmt);
2012         len = vsnprintf((char *) &len, 1, fmt, args) + 1;
2013         va_end(args);
2014         /* Write /sys/kernel/security/tomoyo/audit. */
2015         va_start(args, fmt);
2016         tomoyo_write_log2(r, len, fmt, args);
2017         va_end(args);
2018         /* Nothing more to do if granted. */
2019         if (r->granted)
2020                 return 0;
2021         if (r->mode)
2022                 tomoyo_update_stat(r->mode);
2023         switch (r->mode) {
2024         case TOMOYO_CONFIG_ENFORCING:
2025                 error = -EPERM;
2026                 if (atomic_read(&tomoyo_query_observers))
2027                         break;
2028                 goto out;
2029         case TOMOYO_CONFIG_LEARNING:
2030                 error = 0;
2031                 /* Check max_learning_entry parameter. */
2032                 if (tomoyo_domain_quota_is_ok(r))
2033                         break;
2034                 /* fall through */
2035         default:
2036                 return 0;
2037         }
2038         /* Get message. */
2039         va_start(args, fmt);
2040         entry.query = tomoyo_init_log(r, len, fmt, args);
2041         va_end(args);
2042         if (!entry.query)
2043                 goto out;
2044         entry.query_len = strlen(entry.query) + 1;
2045         if (!error) {
2046                 tomoyo_add_entry(r->domain, entry.query);
2047                 goto out;
2048         }
2049         len = tomoyo_round2(entry.query_len);
2050         entry.domain = r->domain;
2051         spin_lock(&tomoyo_query_list_lock);
2052         if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
2053             tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
2054             >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
2055                 quota_exceeded = true;
2056         } else {
2057                 entry.serial = tomoyo_serial++;
2058                 entry.retry = r->retry;
2059                 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
2060                 list_add_tail(&entry.list, &tomoyo_query_list);
2061         }
2062         spin_unlock(&tomoyo_query_list_lock);
2063         if (quota_exceeded)
2064                 goto out;
2065         /* Give 10 seconds for supervisor's opinion. */
2066         while (entry.timer < 10) {
2067                 wake_up_all(&tomoyo_query_wait);
2068                 if (wait_event_interruptible_timeout
2069                     (tomoyo_answer_wait, entry.answer ||
2070                      !atomic_read(&tomoyo_query_observers), HZ))
2071                         break;
2072                 else
2073                         entry.timer++;
2074         }
2075         spin_lock(&tomoyo_query_list_lock);
2076         list_del(&entry.list);
2077         tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
2078         spin_unlock(&tomoyo_query_list_lock);
2079         switch (entry.answer) {
2080         case 3: /* Asked to retry by administrator. */
2081                 error = TOMOYO_RETRY_REQUEST;
2082                 r->retry++;
2083                 break;
2084         case 1:
2085                 /* Granted by administrator. */
2086                 error = 0;
2087                 break;
2088         default:
2089                 /* Timed out or rejected by administrator. */
2090                 break;
2091         }
2092 out:
2093         kfree(entry.query);
2094         return error;
2095 }
2096
2097 /**
2098  * tomoyo_find_domain_by_qid - Get domain by query id.
2099  *
2100  * @serial: Query ID assigned by tomoyo_supervisor().
2101  *
2102  * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
2103  */
2104 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
2105 (unsigned int serial)
2106 {
2107         struct tomoyo_query *ptr;
2108         struct tomoyo_domain_info *domain = NULL;
2109         spin_lock(&tomoyo_query_list_lock);
2110         list_for_each_entry(ptr, &tomoyo_query_list, list) {
2111                 if (ptr->serial != serial || ptr->answer)
2112                         continue;
2113                 domain = ptr->domain;
2114                 break;
2115         }
2116         spin_unlock(&tomoyo_query_list_lock);
2117         return domain;
2118 }
2119
2120 /**
2121  * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
2122  *
2123  * @file: Pointer to "struct file".
2124  * @wait: Pointer to "poll_table".
2125  *
2126  * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
2127  *
2128  * Waits for access requests which violated policy in enforcing mode.
2129  */
2130 static int tomoyo_poll_query(struct file *file, poll_table *wait)
2131 {
2132         struct list_head *tmp;
2133         bool found = false;
2134         u8 i;
2135         for (i = 0; i < 2; i++) {
2136                 spin_lock(&tomoyo_query_list_lock);
2137                 list_for_each(tmp, &tomoyo_query_list) {
2138                         struct tomoyo_query *ptr =
2139                                 list_entry(tmp, typeof(*ptr), list);
2140                         if (ptr->answer)
2141                                 continue;
2142                         found = true;
2143                         break;
2144                 }
2145                 spin_unlock(&tomoyo_query_list_lock);
2146                 if (found)
2147                         return POLLIN | POLLRDNORM;
2148                 if (i)
2149                         break;
2150                 poll_wait(file, &tomoyo_query_wait, wait);
2151         }
2152         return 0;
2153 }
2154
2155 /**
2156  * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
2157  *
2158  * @head: Pointer to "struct tomoyo_io_buffer".
2159  */
2160 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
2161 {
2162         struct list_head *tmp;
2163         unsigned int pos = 0;
2164         size_t len = 0;
2165         char *buf;
2166         if (head->r.w_pos)
2167                 return;
2168         if (head->read_buf) {
2169                 kfree(head->read_buf);
2170                 head->read_buf = NULL;
2171         }
2172         spin_lock(&tomoyo_query_list_lock);
2173         list_for_each(tmp, &tomoyo_query_list) {
2174                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2175                 if (ptr->answer)
2176                         continue;
2177                 if (pos++ != head->r.query_index)
2178                         continue;
2179                 len = ptr->query_len;
2180                 break;
2181         }
2182         spin_unlock(&tomoyo_query_list_lock);
2183         if (!len) {
2184                 head->r.query_index = 0;
2185                 return;
2186         }
2187         buf = kzalloc(len + 32, GFP_NOFS);
2188         if (!buf)
2189                 return;
2190         pos = 0;
2191         spin_lock(&tomoyo_query_list_lock);
2192         list_for_each(tmp, &tomoyo_query_list) {
2193                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2194                 if (ptr->answer)
2195                         continue;
2196                 if (pos++ != head->r.query_index)
2197                         continue;
2198                 /*
2199                  * Some query can be skipped because tomoyo_query_list
2200                  * can change, but I don't care.
2201                  */
2202                 if (len == ptr->query_len)
2203                         snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
2204                                  ptr->retry, ptr->query);
2205                 break;
2206         }
2207         spin_unlock(&tomoyo_query_list_lock);
2208         if (buf[0]) {
2209                 head->read_buf = buf;
2210                 head->r.w[head->r.w_pos++] = buf;
2211                 head->r.query_index++;
2212         } else {
2213                 kfree(buf);
2214         }
2215 }
2216
2217 /**
2218  * tomoyo_write_answer - Write the supervisor's decision.
2219  *
2220  * @head: Pointer to "struct tomoyo_io_buffer".
2221  *
2222  * Returns 0 on success, -EINVAL otherwise.
2223  */
2224 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
2225 {
2226         char *data = head->write_buf;
2227         struct list_head *tmp;
2228         unsigned int serial;
2229         unsigned int answer;
2230         spin_lock(&tomoyo_query_list_lock);
2231         list_for_each(tmp, &tomoyo_query_list) {
2232                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2233                 ptr->timer = 0;
2234         }
2235         spin_unlock(&tomoyo_query_list_lock);
2236         if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
2237                 return -EINVAL;
2238         spin_lock(&tomoyo_query_list_lock);
2239         list_for_each(tmp, &tomoyo_query_list) {
2240                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2241                 if (ptr->serial != serial)
2242                         continue;
2243                 if (!ptr->answer)
2244                         ptr->answer = answer;
2245                 break;
2246         }
2247         spin_unlock(&tomoyo_query_list_lock);
2248         return 0;
2249 }
2250
2251 /**
2252  * tomoyo_read_version: Get version.
2253  *
2254  * @head: Pointer to "struct tomoyo_io_buffer".
2255  *
2256  * Returns version information.
2257  */
2258 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2259 {
2260         if (!head->r.eof) {
2261                 tomoyo_io_printf(head, "2.5.0");
2262                 head->r.eof = true;
2263         }
2264 }
2265
2266 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2267 static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2268         [TOMOYO_STAT_POLICY_UPDATES]    = "update:",
2269         [TOMOYO_STAT_POLICY_LEARNING]   = "violation in learning mode:",
2270         [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2271         [TOMOYO_STAT_POLICY_ENFORCING]  = "violation in enforcing mode:",
2272 };
2273
2274 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2275 static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2276         [TOMOYO_MEMORY_POLICY] = "policy:",
2277         [TOMOYO_MEMORY_AUDIT]  = "audit log:",
2278         [TOMOYO_MEMORY_QUERY]  = "query message:",
2279 };
2280
2281 /* Timestamp counter for last updated. */
2282 static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2283 /* Counter for number of updates. */
2284 static unsigned int tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2285
2286 /**
2287  * tomoyo_update_stat - Update statistic counters.
2288  *
2289  * @index: Index for policy type.
2290  *
2291  * Returns nothing.
2292  */
2293 void tomoyo_update_stat(const u8 index)
2294 {
2295         struct timeval tv;
2296         do_gettimeofday(&tv);
2297         /*
2298          * I don't use atomic operations because race condition is not fatal.
2299          */
2300         tomoyo_stat_updated[index]++;
2301         tomoyo_stat_modified[index] = tv.tv_sec;
2302 }
2303
2304 /**
2305  * tomoyo_read_stat - Read statistic data.
2306  *
2307  * @head: Pointer to "struct tomoyo_io_buffer".
2308  *
2309  * Returns nothing.
2310  */
2311 static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2312 {
2313         u8 i;
2314         unsigned int total = 0;
2315         if (head->r.eof)
2316                 return;
2317         for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2318                 tomoyo_io_printf(head, "Policy %-30s %10u",
2319                                  tomoyo_policy_headers[i],
2320                                  tomoyo_stat_updated[i]);
2321                 if (tomoyo_stat_modified[i]) {
2322                         struct tomoyo_time stamp;
2323                         tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2324                         tomoyo_io_printf(head, " (Last: %04u/%02u/%02u "
2325                                          "%02u:%02u:%02u)",
2326                                          stamp.year, stamp.month, stamp.day,
2327                                          stamp.hour, stamp.min, stamp.sec);
2328                 }
2329                 tomoyo_set_lf(head);
2330         }
2331         for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2332                 unsigned int used = tomoyo_memory_used[i];
2333                 total += used;
2334                 tomoyo_io_printf(head, "Memory used by %-22s %10u",
2335                                  tomoyo_memory_headers[i], used);
2336                 used = tomoyo_memory_quota[i];
2337                 if (used)
2338                         tomoyo_io_printf(head, " (Quota: %10u)", used);
2339                 tomoyo_set_lf(head);
2340         }
2341         tomoyo_io_printf(head, "Total memory used:                    %10u\n",
2342                          total);
2343         head->r.eof = true;
2344 }
2345
2346 /**
2347  * tomoyo_write_stat - Set memory quota.
2348  *
2349  * @head: Pointer to "struct tomoyo_io_buffer".
2350  *
2351  * Returns 0.
2352  */
2353 static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2354 {
2355         char *data = head->write_buf;
2356         u8 i;
2357         if (tomoyo_str_starts(&data, "Memory used by "))
2358                 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2359                         if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2360                                 sscanf(data, "%u", &tomoyo_memory_quota[i]);
2361         return 0;
2362 }
2363
2364 /**
2365  * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2366  *
2367  * @type: Type of interface.
2368  * @file: Pointer to "struct file".
2369  *
2370  * Returns 0 on success, negative value otherwise.
2371  */
2372 int tomoyo_open_control(const u8 type, struct file *file)
2373 {
2374         struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2375
2376         if (!head)
2377                 return -ENOMEM;
2378         mutex_init(&head->io_sem);
2379         head->type = type;
2380         switch (type) {
2381         case TOMOYO_DOMAINPOLICY:
2382                 /* /sys/kernel/security/tomoyo/domain_policy */
2383                 head->write = tomoyo_write_domain;
2384                 head->read = tomoyo_read_domain;
2385                 break;
2386         case TOMOYO_EXCEPTIONPOLICY:
2387                 /* /sys/kernel/security/tomoyo/exception_policy */
2388                 head->write = tomoyo_write_exception;
2389                 head->read = tomoyo_read_exception;
2390                 break;
2391         case TOMOYO_AUDIT:
2392                 /* /sys/kernel/security/tomoyo/audit */
2393                 head->poll = tomoyo_poll_log;
2394                 head->read = tomoyo_read_log;
2395                 break;
2396         case TOMOYO_PROCESS_STATUS:
2397                 /* /sys/kernel/security/tomoyo/.process_status */
2398                 head->write = tomoyo_write_pid;
2399                 head->read = tomoyo_read_pid;
2400                 break;
2401         case TOMOYO_VERSION:
2402                 /* /sys/kernel/security/tomoyo/version */
2403                 head->read = tomoyo_read_version;
2404                 head->readbuf_size = 128;
2405                 break;
2406         case TOMOYO_STAT:
2407                 /* /sys/kernel/security/tomoyo/stat */
2408                 head->write = tomoyo_write_stat;
2409                 head->read = tomoyo_read_stat;
2410                 head->readbuf_size = 1024;
2411                 break;
2412         case TOMOYO_PROFILE:
2413                 /* /sys/kernel/security/tomoyo/profile */
2414                 head->write = tomoyo_write_profile;
2415                 head->read = tomoyo_read_profile;
2416                 break;
2417         case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2418                 head->poll = tomoyo_poll_query;
2419                 head->write = tomoyo_write_answer;
2420                 head->read = tomoyo_read_query;
2421                 break;
2422         case TOMOYO_MANAGER:
2423                 /* /sys/kernel/security/tomoyo/manager */
2424                 head->write = tomoyo_write_manager;
2425                 head->read = tomoyo_read_manager;
2426                 break;
2427         }
2428         if (!(file->f_mode & FMODE_READ)) {
2429                 /*
2430                  * No need to allocate read_buf since it is not opened
2431                  * for reading.
2432                  */
2433                 head->read = NULL;
2434                 head->poll = NULL;
2435         } else if (!head->poll) {
2436                 /* Don't allocate read_buf for poll() access. */
2437                 if (!head->readbuf_size)
2438                         head->readbuf_size = 4096 * 2;
2439                 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2440                 if (!head->read_buf) {
2441                         kfree(head);
2442                         return -ENOMEM;
2443                 }
2444         }
2445         if (!(file->f_mode & FMODE_WRITE)) {
2446                 /*
2447                  * No need to allocate write_buf since it is not opened
2448                  * for writing.
2449                  */
2450                 head->write = NULL;
2451         } else if (head->write) {
2452                 head->writebuf_size = 4096 * 2;
2453                 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2454                 if (!head->write_buf) {
2455                         kfree(head->read_buf);
2456                         kfree(head);
2457                         return -ENOMEM;
2458                 }
2459         }
2460         /*
2461          * If the file is /sys/kernel/security/tomoyo/query , increment the
2462          * observer counter.
2463          * The obserber counter is used by tomoyo_supervisor() to see if
2464          * there is some process monitoring /sys/kernel/security/tomoyo/query.
2465          */
2466         if (type == TOMOYO_QUERY)
2467                 atomic_inc(&tomoyo_query_observers);
2468         file->private_data = head;
2469         tomoyo_notify_gc(head, true);
2470         return 0;
2471 }
2472
2473 /**
2474  * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2475  *
2476  * @file: Pointer to "struct file".
2477  * @wait: Pointer to "poll_table".
2478  *
2479  * Waits for read readiness.
2480  * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd and
2481  * /sys/kernel/security/tomoyo/audit is handled by /usr/sbin/tomoyo-auditd.
2482  */
2483 int tomoyo_poll_control(struct file *file, poll_table *wait)
2484 {
2485         struct tomoyo_io_buffer *head = file->private_data;
2486         if (!head->poll)
2487                 return -ENOSYS;
2488         return head->poll(file, wait);
2489 }
2490
2491 /**
2492  * tomoyo_set_namespace_cursor - Set namespace to read.
2493  *
2494  * @head: Pointer to "struct tomoyo_io_buffer".
2495  *
2496  * Returns nothing.
2497  */
2498 static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2499 {
2500         struct list_head *ns;
2501         if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2502             head->type != TOMOYO_PROFILE)
2503                 return;
2504         /*
2505          * If this is the first read, or reading previous namespace finished
2506          * and has more namespaces to read, update the namespace cursor.
2507          */
2508         ns = head->r.ns;
2509         if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2510                 /* Clearing is OK because tomoyo_flush() returned true. */
2511                 memset(&head->r, 0, sizeof(head->r));
2512                 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2513         }
2514 }
2515
2516 /**
2517  * tomoyo_has_more_namespace - Check for unread namespaces.
2518  *
2519  * @head: Pointer to "struct tomoyo_io_buffer".
2520  *
2521  * Returns true if we have more entries to print, false otherwise.
2522  */
2523 static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2524 {
2525         return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2526                 head->type == TOMOYO_PROFILE) && head->r.eof &&
2527                 head->r.ns->next != &tomoyo_namespace_list;
2528 }
2529
2530 /**
2531  * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2532  *
2533  * @head:       Pointer to "struct tomoyo_io_buffer".
2534  * @buffer:     Poiner to buffer to write to.
2535  * @buffer_len: Size of @buffer.
2536  *
2537  * Returns bytes read on success, negative value otherwise.
2538  */
2539 ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2540                             const int buffer_len)
2541 {
2542         int len;
2543         int idx;
2544
2545         if (!head->read)
2546                 return -ENOSYS;
2547         if (mutex_lock_interruptible(&head->io_sem))
2548                 return -EINTR;
2549         head->read_user_buf = buffer;
2550         head->read_user_buf_avail = buffer_len;
2551         idx = tomoyo_read_lock();
2552         if (tomoyo_flush(head))
2553                 /* Call the policy handler. */
2554                 do {
2555                         tomoyo_set_namespace_cursor(head);
2556                         head->read(head);
2557                 } while (tomoyo_flush(head) &&
2558                          tomoyo_has_more_namespace(head));
2559         tomoyo_read_unlock(idx);
2560         len = head->read_user_buf - buffer;
2561         mutex_unlock(&head->io_sem);
2562         return len;
2563 }
2564
2565 /**
2566  * tomoyo_parse_policy - Parse a policy line.
2567  *
2568  * @head: Poiter to "struct tomoyo_io_buffer".
2569  * @line: Line to parse.
2570  *
2571  * Returns 0 on success, negative value otherwise.
2572  *
2573  * Caller holds tomoyo_read_lock().
2574  */
2575 static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2576 {
2577         /* Delete request? */
2578         head->w.is_delete = !strncmp(line, "delete ", 7);
2579         if (head->w.is_delete)
2580                 memmove(line, line + 7, strlen(line + 7) + 1);
2581         /* Selecting namespace to update. */
2582         if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2583             head->type == TOMOYO_PROFILE) {
2584                 if (*line == '<') {
2585                         char *cp = strchr(line, ' ');
2586                         if (cp) {
2587                                 *cp++ = '\0';
2588                                 head->w.ns = tomoyo_assign_namespace(line);
2589                                 memmove(line, cp, strlen(cp) + 1);
2590                         } else
2591                                 head->w.ns = NULL;
2592                 } else
2593                         head->w.ns = &tomoyo_kernel_namespace;
2594                 /* Don't allow updating if namespace is invalid. */
2595                 if (!head->w.ns)
2596                         return -ENOENT;
2597         }
2598         /* Do the update. */
2599         return head->write(head);
2600 }
2601
2602 /**
2603  * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2604  *
2605  * @head:       Pointer to "struct tomoyo_io_buffer".
2606  * @buffer:     Pointer to buffer to read from.
2607  * @buffer_len: Size of @buffer.
2608  *
2609  * Returns @buffer_len on success, negative value otherwise.
2610  */
2611 ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2612                              const char __user *buffer, const int buffer_len)
2613 {
2614         int error = buffer_len;
2615         size_t avail_len = buffer_len;
2616         char *cp0 = head->write_buf;
2617         int idx;
2618         if (!head->write)
2619                 return -ENOSYS;
2620         if (!access_ok(VERIFY_READ, buffer, buffer_len))
2621                 return -EFAULT;
2622         if (mutex_lock_interruptible(&head->io_sem))
2623                 return -EINTR;
2624         head->read_user_buf_avail = 0;
2625         idx = tomoyo_read_lock();
2626         /* Read a line and dispatch it to the policy handler. */
2627         while (avail_len > 0) {
2628                 char c;
2629                 if (head->w.avail >= head->writebuf_size - 1) {
2630                         const int len = head->writebuf_size * 2;
2631                         char *cp = kzalloc(len, GFP_NOFS);
2632                         if (!cp) {
2633                                 error = -ENOMEM;
2634                                 break;
2635                         }
2636                         memmove(cp, cp0, head->w.avail);
2637                         kfree(cp0);
2638                         head->write_buf = cp;
2639                         cp0 = cp;
2640                         head->writebuf_size = len;
2641                 }
2642                 if (get_user(c, buffer)) {
2643                         error = -EFAULT;
2644                         break;
2645                 }
2646                 buffer++;
2647                 avail_len--;
2648                 cp0[head->w.avail++] = c;
2649                 if (c != '\n')
2650                         continue;
2651                 cp0[head->w.avail - 1] = '\0';
2652                 head->w.avail = 0;
2653                 tomoyo_normalize_line(cp0);
2654                 if (!strcmp(cp0, "reset")) {
2655                         head->w.ns = &tomoyo_kernel_namespace;
2656                         head->w.domain = NULL;
2657                         memset(&head->r, 0, sizeof(head->r));
2658                         continue;
2659                 }
2660                 /* Don't allow updating policies by non manager programs. */
2661                 switch (head->type) {
2662                 case TOMOYO_PROCESS_STATUS:
2663                         /* This does not write anything. */
2664                         break;
2665                 case TOMOYO_DOMAINPOLICY:
2666                         if (tomoyo_select_domain(head, cp0))
2667                                 continue;
2668                         /* fall through */
2669                 case TOMOYO_EXCEPTIONPOLICY:
2670                         if (!strcmp(cp0, "select transition_only")) {
2671                                 head->r.print_transition_related_only = true;
2672                                 continue;
2673                         }
2674                         /* fall through */
2675                 default:
2676                         if (!tomoyo_manager()) {
2677                                 error = -EPERM;
2678                                 goto out;
2679                         }
2680                 }
2681                 switch (tomoyo_parse_policy(head, cp0)) {
2682                 case -EPERM:
2683                         error = -EPERM;
2684                         goto out;
2685                 case 0:
2686                         switch (head->type) {
2687                         case TOMOYO_DOMAINPOLICY:
2688                         case TOMOYO_EXCEPTIONPOLICY:
2689                         case TOMOYO_STAT:
2690                         case TOMOYO_PROFILE:
2691                         case TOMOYO_MANAGER:
2692                                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2693                                 break;
2694                         default:
2695                                 break;
2696                         }
2697                         break;
2698                 }
2699         }
2700 out:
2701         tomoyo_read_unlock(idx);
2702         mutex_unlock(&head->io_sem);
2703         return error;
2704 }
2705
2706 /**
2707  * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2708  *
2709  * @head: Pointer to "struct tomoyo_io_buffer".
2710  *
2711  * Returns 0.
2712  */
2713 int tomoyo_close_control(struct tomoyo_io_buffer *head)
2714 {
2715         /*
2716          * If the file is /sys/kernel/security/tomoyo/query , decrement the
2717          * observer counter.
2718          */
2719         if (head->type == TOMOYO_QUERY &&
2720             atomic_dec_and_test(&tomoyo_query_observers))
2721                 wake_up_all(&tomoyo_answer_wait);
2722         tomoyo_notify_gc(head, false);
2723         return 0;
2724 }
2725
2726 /**
2727  * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2728  */
2729 void tomoyo_check_profile(void)
2730 {
2731         struct tomoyo_domain_info *domain;
2732         const int idx = tomoyo_read_lock();
2733         tomoyo_policy_loaded = true;
2734         printk(KERN_INFO "TOMOYO: 2.5.0\n");
2735         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2736                 const u8 profile = domain->profile;
2737                 const struct tomoyo_policy_namespace *ns = domain->ns;
2738                 if (ns->profile_version != 20110903)
2739                         printk(KERN_ERR
2740                                "Profile version %u is not supported.\n",
2741                                ns->profile_version);
2742                 else if (!ns->profile_ptr[profile])
2743                         printk(KERN_ERR
2744                                "Profile %u (used by '%s') is not defined.\n",
2745                                profile, domain->domainname->name);
2746                 else
2747                         continue;
2748                 printk(KERN_ERR
2749                        "Userland tools for TOMOYO 2.5 must be installed and "
2750                        "policy must be initialized.\n");
2751                 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.5/ "
2752                        "for more information.\n");
2753                 panic("STOP!");
2754         }
2755         tomoyo_read_unlock(idx);
2756         printk(KERN_INFO "Mandatory Access Control activated.\n");
2757 }
2758
2759 /**
2760  * tomoyo_load_builtin_policy - Load built-in policy.
2761  *
2762  * Returns nothing.
2763  */
2764 void __init tomoyo_load_builtin_policy(void)
2765 {
2766         /*
2767          * This include file is manually created and contains built-in policy
2768          * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2769          * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2770          * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2771          */
2772 #include "builtin-policy.h"
2773         u8 i;
2774         const int idx = tomoyo_read_lock();
2775         for (i = 0; i < 5; i++) {
2776                 struct tomoyo_io_buffer head = { };
2777                 char *start = "";
2778                 switch (i) {
2779                 case 0:
2780                         start = tomoyo_builtin_profile;
2781                         head.type = TOMOYO_PROFILE;
2782                         head.write = tomoyo_write_profile;
2783                         break;
2784                 case 1:
2785                         start = tomoyo_builtin_exception_policy;
2786                         head.type = TOMOYO_EXCEPTIONPOLICY;
2787                         head.write = tomoyo_write_exception;
2788                         break;
2789                 case 2:
2790                         start = tomoyo_builtin_domain_policy;
2791                         head.type = TOMOYO_DOMAINPOLICY;
2792                         head.write = tomoyo_write_domain;
2793                         break;
2794                 case 3:
2795                         start = tomoyo_builtin_manager;
2796                         head.type = TOMOYO_MANAGER;
2797                         head.write = tomoyo_write_manager;
2798                         break;
2799                 case 4:
2800                         start = tomoyo_builtin_stat;
2801                         head.type = TOMOYO_STAT;
2802                         head.write = tomoyo_write_stat;
2803                         break;
2804                 }
2805                 while (1) {
2806                         char *end = strchr(start, '\n');
2807                         if (!end)
2808                                 break;
2809                         *end = '\0';
2810                         tomoyo_normalize_line(start);
2811                         head.write_buf = start;
2812                         tomoyo_parse_policy(&head, start);
2813                         start = end + 1;
2814                 }
2815         }
2816         tomoyo_read_unlock(idx);
2817 #ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2818         tomoyo_check_profile();
2819 #endif
2820 }