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 /**
 266  * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
 267  *
 268  * @head: Pointer to "struct tomoyo_io_buffer".
 269  * @fmt:  The printf()'s format string, followed by parameters.
 270  */
 271 void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
 272 {
 273         va_list args;
 274         size_t len;
 275         size_t pos = head->r.avail;
 276         int size = head->readbuf_size - pos;
 277         if (size <= 0)
 278                 return;
 279         va_start(args, fmt);
 280         len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
 281         va_end(args);
 282         if (pos + len >= head->readbuf_size) {
 283                 WARN_ON(1);
 284                 return;
 285         }
 286         head->r.avail += len;
 287         tomoyo_set_string(head, head->read_buf + pos);
 288 }
 289
 290 /**
 291  * tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure.
 292  *
 293  * @head: Pointer to "struct tomoyo_io_buffer".
 294  *
 295  * Returns nothing.
 296  */
 297 static void tomoyo_set_space(struct tomoyo_io_buffer *head)
 298 {
 299         tomoyo_set_string(head, " ");
 300 }
 301
 302 /**
 303  * tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure.
 304  *
 305  * @head: Pointer to "struct tomoyo_io_buffer".
 306  *
 307  * Returns nothing.
 308  */
 309 static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
 310 {
 311         tomoyo_set_string(head, "\n");
 312         return !head->r.w_pos;
 313 }
 314
 315 /**
 316  * tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure.
 317  *
 318  * @head: Pointer to "struct tomoyo_io_buffer".
 319  *
 320  * Returns nothing.
 321  */
 322 static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
 323 {
 324         tomoyo_set_string(head, "/");
 325 }
 326
 327 /* List of namespaces. */
 328 LIST_HEAD(tomoyo_namespace_list);
 329 /* True if namespace other than tomoyo_kernel_namespace is defined. */
 330 static bool tomoyo_namespace_enabled;
 331
 332 /**
 333  * tomoyo_init_policy_namespace - Initialize namespace.
 334  *
 335  * @ns: Pointer to "struct tomoyo_policy_namespace".
 336  *
 337  * Returns nothing.
 338  */
 339 void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns)
 340 {
 341         unsigned int idx;
 342         for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++)
 343                 INIT_LIST_HEAD(&ns->acl_group[idx]);
 344         for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++)
 345                 INIT_LIST_HEAD(&ns->group_list[idx]);
 346         for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++)
 347                 INIT_LIST_HEAD(&ns->policy_list[idx]);
 348         ns->profile_version = 20100903;
 349         tomoyo_namespace_enabled = !list_empty(&tomoyo_namespace_list);
 350         list_add_tail_rcu(&ns->namespace_list, &tomoyo_namespace_list);
 351 }
 352
 353 /**
 354  * tomoyo_print_namespace - Print namespace header.
 355  *
 356  * @head: Pointer to "struct tomoyo_io_buffer".
 357  *
 358  * Returns nothing.
 359  */
 360 static void tomoyo_print_namespace(struct tomoyo_io_buffer *head)
 361 {
 362         if (!tomoyo_namespace_enabled)
 363                 return;
 364         tomoyo_set_string(head,
 365                           container_of(head->r.ns,
 366                                        struct tomoyo_policy_namespace,
 367                                        namespace_list)->name);
 368         tomoyo_set_space(head);
 369 }
 370
 371 /**
 372  * tomoyo_print_name_union - Print a tomoyo_name_union.
 373  *
 374  * @head: Pointer to "struct tomoyo_io_buffer".
 375  * @ptr:  Pointer to "struct tomoyo_name_union".
 376  */
 377 static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
 378                                     const struct tomoyo_name_union *ptr)
 379 {
 380         tomoyo_set_space(head);
 381         if (ptr->group) {
 382                 tomoyo_set_string(head, "@");
 383                 tomoyo_set_string(head, ptr->group->group_name->name);
 384         } else {
 385                 tomoyo_set_string(head, ptr->filename->name);
 386         }
 387 }
 388
 389 /**
 390  * tomoyo_print_name_union_quoted - Print a tomoyo_name_union with a quote.
 391  *
 392  * @head: Pointer to "struct tomoyo_io_buffer".
 393  * @ptr:  Pointer to "struct tomoyo_name_union".
 394  *
 395  * Returns nothing.
 396  */
 397 static void tomoyo_print_name_union_quoted(struct tomoyo_io_buffer *head,
 398                                            const struct tomoyo_name_union *ptr)
 399 {
 400         if (ptr->group) {
 401                 tomoyo_set_string(head, "@");
 402                 tomoyo_set_string(head, ptr->group->group_name->name);
 403         } else {
 404                 tomoyo_set_string(head, "\"");
 405                 tomoyo_set_string(head, ptr->filename->name);
 406                 tomoyo_set_string(head, "\"");
 407         }
 408 }
 409
 410 /**
 411  * tomoyo_print_number_union_nospace - Print a tomoyo_number_union without a space.
 412  *
 413  * @head: Pointer to "struct tomoyo_io_buffer".
 414  * @ptr:  Pointer to "struct tomoyo_number_union".
 415  *
 416  * Returns nothing.
 417  */
 418 static void tomoyo_print_number_union_nospace
 419 (struct tomoyo_io_buffer *head, const struct tomoyo_number_union *ptr)
 420 {
 421         if (ptr->group) {
 422                 tomoyo_set_string(head, "@");
 423                 tomoyo_set_string(head, ptr->group->group_name->name);
 424         } else {
 425                 int i;
 426                 unsigned long min = ptr->values[0];
 427                 const unsigned long max = ptr->values[1];
 428                 u8 min_type = ptr->value_type[0];
 429                 const u8 max_type = ptr->value_type[1];
 430                 char buffer[128];
 431                 buffer[0] = '\0';
 432                 for (i = 0; i < 2; i++) {
 433                         switch (min_type) {
 434                         case TOMOYO_VALUE_TYPE_HEXADECIMAL:
 435                                 tomoyo_addprintf(buffer, sizeof(buffer),
 436                                                  "0x%lX", min);
 437                                 break;
 438                         case TOMOYO_VALUE_TYPE_OCTAL:
 439                                 tomoyo_addprintf(buffer, sizeof(buffer),
 440                                                  "0%lo", min);
 441                                 break;
 442                         default:
 443                                 tomoyo_addprintf(buffer, sizeof(buffer), "%lu",
 444                                                  min);
 445                                 break;
 446                         }
 447                         if (min == max && min_type == max_type)
 448                                 break;
 449                         tomoyo_addprintf(buffer, sizeof(buffer), "-");
 450                         min_type = max_type;
 451                         min = max;
 452                 }
 453                 tomoyo_io_printf(head, "%s", buffer);
 454         }
 455 }
 456
 457 /**
 458  * tomoyo_print_number_union - Print a tomoyo_number_union.
 459  *
 460  * @head: Pointer to "struct tomoyo_io_buffer".
 461  * @ptr:  Pointer to "struct tomoyo_number_union".
 462  *
 463  * Returns nothing.
 464  */
 465 static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
 466                                       const struct tomoyo_number_union *ptr)
 467 {
 468         tomoyo_set_space(head);
 469         tomoyo_print_number_union_nospace(head, ptr);
 470 }
 471
 472 /**
 473  * tomoyo_assign_profile - Create a new profile.
 474  *
 475  * @ns:      Pointer to "struct tomoyo_policy_namespace".
 476  * @profile: Profile number to create.
 477  *
 478  * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
 479  */
 480 static struct tomoyo_profile *tomoyo_assign_profile
 481 (struct tomoyo_policy_namespace *ns, const unsigned int profile)
 482 {
 483         struct tomoyo_profile *ptr;
 484         struct tomoyo_profile *entry;
 485         if (profile >= TOMOYO_MAX_PROFILES)
 486                 return NULL;
 487         ptr = ns->profile_ptr[profile];
 488         if (ptr)
 489                 return ptr;
 490         entry = kzalloc(sizeof(*entry), GFP_NOFS);
 491         if (mutex_lock_interruptible(&tomoyo_policy_lock))
 492                 goto out;
 493         ptr = ns->profile_ptr[profile];
 494         if (!ptr && tomoyo_memory_ok(entry)) {
 495                 ptr = entry;
 496                 ptr->default_config = TOMOYO_CONFIG_DISABLED |
 497                         TOMOYO_CONFIG_WANT_GRANT_LOG |
 498                         TOMOYO_CONFIG_WANT_REJECT_LOG;
 499                 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
 500                        sizeof(ptr->config));
 501                 ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] = 1024;
 502                 ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] = 2048;
 503                 mb(); /* Avoid out-of-order execution. */
 504                 ns->profile_ptr[profile] = ptr;
 505                 entry = NULL;
 506         }
 507         mutex_unlock(&tomoyo_policy_lock);
 508  out:
 509         kfree(entry);
 510         return ptr;
 511 }
 512
 513 /**
 514  * tomoyo_profile - Find a profile.
 515  *
 516  * @ns:      Pointer to "struct tomoyo_policy_namespace".
 517  * @profile: Profile number to find.
 518  *
 519  * Returns pointer to "struct tomoyo_profile".
 520  */
 521 struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns,
 522                                       const u8 profile)
 523 {
 524         static struct tomoyo_profile tomoyo_null_profile;
 525         struct tomoyo_profile *ptr = ns->profile_ptr[profile];
 526         if (!ptr)
 527                 ptr = &tomoyo_null_profile;
 528         return ptr;
 529 }
 530
 531 /**
 532  * tomoyo_find_yesno - Find values for specified keyword.
 533  *
 534  * @string: String to check.
 535  * @find:   Name of keyword.
 536  *
 537  * Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise.
 538  */
 539 static s8 tomoyo_find_yesno(const char *string, const char *find)
 540 {
 541         const char *cp = strstr(string, find);
 542         if (cp) {
 543                 cp += strlen(find);
 544                 if (!strncmp(cp, "=yes", 4))
 545                         return 1;
 546                 else if (!strncmp(cp, "=no", 3))
 547                         return 0;
 548         }
 549         return -1;
 550 }
 551
 552 /**
 553  * tomoyo_set_uint - Set value for specified preference.
 554  *
 555  * @i:      Pointer to "unsigned int".
 556  * @string: String to check.
 557  * @find:   Name of keyword.
 558  *
 559  * Returns nothing.
 560  */
 561 static void tomoyo_set_uint(unsigned int *i, const char *string,
 562                             const char *find)
 563 {
 564         const char *cp = strstr(string, find);
 565         if (cp)
 566                 sscanf(cp + strlen(find), "=%u", i);
 567 }
 568
 569 /**
 570  * tomoyo_set_mode - Set mode for specified profile.
 571  *
 572  * @name:    Name of functionality.
 573  * @value:   Mode for @name.
 574  * @profile: Pointer to "struct tomoyo_profile".
 575  *
 576  * Returns 0 on success, negative value otherwise.
 577  */
 578 static int tomoyo_set_mode(char *name, const char *value,
 579                            struct tomoyo_profile *profile)
 580 {
 581         u8 i;
 582         u8 config;
 583         if (!strcmp(name, "CONFIG")) {
 584                 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
 585                 config = profile->default_config;
 586         } else if (tomoyo_str_starts(&name, "CONFIG::")) {
 587                 config = 0;
 588                 for (i = 0; i < TOMOYO_MAX_MAC_INDEX
 589                              + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
 590                         int len = 0;
 591                         if (i < TOMOYO_MAX_MAC_INDEX) {
 592                                 const u8 c = tomoyo_index2category[i];
 593                                 const char *category =
 594                                         tomoyo_category_keywords[c];
 595                                 len = strlen(category);
 596                                 if (strncmp(name, category, len) ||
 597                                     name[len++] != ':' || name[len++] != ':')
 598                                         continue;
 599                         }
 600                         if (strcmp(name + len, tomoyo_mac_keywords[i]))
 601                                 continue;
 602                         config = profile->config[i];
 603                         break;
 604                 }
 605                 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
 606                         return -EINVAL;
 607         } else {
 608                 return -EINVAL;
 609         }
 610         if (strstr(value, "use_default")) {
 611                 config = TOMOYO_CONFIG_USE_DEFAULT;
 612         } else {
 613                 u8 mode;
 614                 for (mode = 0; mode < 4; mode++)
 615                         if (strstr(value, tomoyo_mode[mode]))
 616                                 /*
 617                                  * Update lower 3 bits in order to distinguish
 618                                  * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
 619                                  */
 620                                 config = (config & ~7) | mode;
 621                 if (config != TOMOYO_CONFIG_USE_DEFAULT) {
 622                         switch (tomoyo_find_yesno(value, "grant_log")) {
 623                         case 1:
 624                                 config |= TOMOYO_CONFIG_WANT_GRANT_LOG;
 625                                 break;
 626                         case 0:
 627                                 config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG;
 628                                 break;
 629                         }
 630                         switch (tomoyo_find_yesno(value, "reject_log")) {
 631                         case 1:
 632                                 config |= TOMOYO_CONFIG_WANT_REJECT_LOG;
 633                                 break;
 634                         case 0:
 635                                 config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG;
 636                                 break;
 637                         }
 638                 }
 639         }
 640         if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
 641                 profile->config[i] = config;
 642         else if (config != TOMOYO_CONFIG_USE_DEFAULT)
 643                 profile->default_config = config;
 644         return 0;
 645 }
 646
 647 /**
 648  * tomoyo_write_profile - Write profile table.
 649  *
 650  * @head: Pointer to "struct tomoyo_io_buffer".
 651  *
 652  * Returns 0 on success, negative value otherwise.
 653  */
 654 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
 655 {
 656         char *data = head->write_buf;
 657         unsigned int i;
 658         char *cp;
 659         struct tomoyo_profile *profile;
 660         if (sscanf(data, "PROFILE_VERSION=%u", &head->w.ns->profile_version)
 661             == 1)
 662                 return 0;
 663         i = simple_strtoul(data, &cp, 10);
 664         if (*cp != '-')
 665                 return -EINVAL;
 666         data = cp + 1;
 667         profile = tomoyo_assign_profile(head->w.ns, i);
 668         if (!profile)
 669                 return -EINVAL;
 670         cp = strchr(data, '=');
 671         if (!cp)
 672                 return -EINVAL;
 673         *cp++ = '\0';
 674         if (!strcmp(data, "COMMENT")) {
 675                 static DEFINE_SPINLOCK(lock);
 676                 const struct tomoyo_path_info *new_comment
 677                         = tomoyo_get_name(cp);
 678                 const struct tomoyo_path_info *old_comment;
 679                 if (!new_comment)
 680                         return -ENOMEM;
 681                 spin_lock(&lock);
 682                 old_comment = profile->comment;
 683                 profile->comment = new_comment;
 684                 spin_unlock(&lock);
 685                 tomoyo_put_name(old_comment);
 686                 return 0;
 687         }
 688         if (!strcmp(data, "PREFERENCE")) {
 689                 for (i = 0; i < TOMOYO_MAX_PREF; i++)
 690                         tomoyo_set_uint(&profile->pref[i], cp,
 691                                         tomoyo_pref_keywords[i]);
 692                 return 0;
 693         }
 694         return tomoyo_set_mode(data, cp, profile);
 695 }
 696
 697 /**
 698  * tomoyo_print_config - Print mode for specified functionality.
 699  *
 700  * @head:   Pointer to "struct tomoyo_io_buffer".
 701  * @config: Mode for that functionality.
 702  *
 703  * Returns nothing.
 704  *
 705  * Caller prints functionality's name.
 706  */
 707 static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
 708 {
 709         tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n",
 710                          tomoyo_mode[config & 3],
 711                          tomoyo_yesno(config & TOMOYO_CONFIG_WANT_GRANT_LOG),
 712                          tomoyo_yesno(config & TOMOYO_CONFIG_WANT_REJECT_LOG));
 713 }
 714
 715 /**
 716  * tomoyo_read_profile - Read profile table.
 717  *
 718  * @head: Pointer to "struct tomoyo_io_buffer".
 719  *
 720  * Returns nothing.
 721  */
 722 static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
 723 {
 724         u8 index;
 725         struct tomoyo_policy_namespace *ns =
 726                 container_of(head->r.ns, typeof(*ns), namespace_list);
 727         const struct tomoyo_profile *profile;
 728         if (head->r.eof)
 729                 return;
 730  next:
 731         index = head->r.index;
 732         profile = ns->profile_ptr[index];
 733         switch (head->r.step) {
 734         case 0:
 735                 tomoyo_print_namespace(head);
 736                 tomoyo_io_printf(head, "PROFILE_VERSION=%u\n",
 737                                  ns->profile_version);
 738                 head->r.step++;
 739                 break;
 740         case 1:
 741                 for ( ; head->r.index < TOMOYO_MAX_PROFILES;
 742                       head->r.index++)
 743                         if (ns->profile_ptr[head->r.index])
 744                                 break;
 745                 if (head->r.index == TOMOYO_MAX_PROFILES)
 746                         return;
 747                 head->r.step++;
 748                 break;
 749         case 2:
 750                 {
 751                         u8 i;
 752                         const struct tomoyo_path_info *comment =
 753                                 profile->comment;
 754                         tomoyo_print_namespace(head);
 755                         tomoyo_io_printf(head, "%u-COMMENT=", index);
 756                         tomoyo_set_string(head, comment ? comment->name : "");
 757                         tomoyo_set_lf(head);
 758                         tomoyo_io_printf(head, "%u-PREFERENCE={ ", index);
 759                         for (i = 0; i < TOMOYO_MAX_PREF; i++)
 760                                 tomoyo_io_printf(head, "%s=%u ",
 761                                                  tomoyo_pref_keywords[i],
 762                                                  profile->pref[i]);
 763                         tomoyo_set_string(head, "}\n");
 764                         head->r.step++;
 765                 }
 766                 break;
 767         case 3:
 768                 {
 769                         tomoyo_print_namespace(head);
 770                         tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
 771                         tomoyo_print_config(head, profile->default_config);
 772                         head->r.bit = 0;
 773                         head->r.step++;
 774                 }
 775                 break;
 776         case 4:
 777                 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
 778                               + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
 779                         const u8 i = head->r.bit;
 780                         const u8 config = profile->config[i];
 781                         if (config == TOMOYO_CONFIG_USE_DEFAULT)
 782                                 continue;
 783                         tomoyo_print_namespace(head);
 784                         if (i < TOMOYO_MAX_MAC_INDEX)
 785                                 tomoyo_io_printf(head, "%u-CONFIG::%s::%s",
 786                                                  index,
 787                                                  tomoyo_category_keywords
 788                                                  [tomoyo_index2category[i]],
 789                                                  tomoyo_mac_keywords[i]);
 790                         else
 791                                 tomoyo_io_printf(head, "%u-CONFIG::%s", index,
 792                                                  tomoyo_mac_keywords[i]);
 793                         tomoyo_print_config(head, config);
 794                         head->r.bit++;
 795                         break;
 796                 }
 797                 if (head->r.bit == TOMOYO_MAX_MAC_INDEX
 798                     + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
 799                         head->r.index++;
 800                         head->r.step = 1;
 801                 }
 802                 break;
 803         }
 804         if (tomoyo_flush(head))
 805                 goto next;
 806 }
 807
 808 /**
 809  * tomoyo_same_manager - Check for duplicated "struct tomoyo_manager" entry.
 810  *
 811  * @a: Pointer to "struct tomoyo_acl_head".
 812  * @b: Pointer to "struct tomoyo_acl_head".
 813  *
 814  * Returns true if @a == @b, false otherwise.
 815  */
 816 static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
 817                                 const struct tomoyo_acl_head *b)
 818 {
 819         return container_of(a, struct tomoyo_manager, head)->manager ==
 820                 container_of(b, struct tomoyo_manager, head)->manager;
 821 }
 822
 823 /**
 824  * tomoyo_update_manager_entry - Add a manager entry.
 825  *
 826  * @manager:   The path to manager or the domainnamme.
 827  * @is_delete: True if it is a delete request.
 828  *
 829  * Returns 0 on success, negative value otherwise.
 830  *
 831  * Caller holds tomoyo_read_lock().
 832  */
 833 static int tomoyo_update_manager_entry(const char *manager,
 834                                        const bool is_delete)
 835 {
 836         struct tomoyo_manager e = { };
 837         struct tomoyo_acl_param param = {
 838                 /* .ns = &tomoyo_kernel_namespace, */
 839                 .is_delete = is_delete,
 840                 .list = &tomoyo_kernel_namespace.
 841                 policy_list[TOMOYO_ID_MANAGER],
 842         };
 843         int error = is_delete ? -ENOENT : -ENOMEM;
 844         if (tomoyo_domain_def(manager)) {
 845                 if (!tomoyo_correct_domain(manager))
 846                         return -EINVAL;
 847                 e.is_domain = true;
 848         } else {
 849                 if (!tomoyo_correct_path(manager))
 850                         return -EINVAL;
 851         }
 852         e.manager = tomoyo_get_name(manager);
 853         if (e.manager) {
 854                 error = tomoyo_update_policy(&e.head, sizeof(e), &param,
 855                                              tomoyo_same_manager);
 856                 tomoyo_put_name(e.manager);
 857         }
 858         return error;
 859 }
 860
 861 /**
 862  * tomoyo_write_manager - Write manager policy.
 863  *
 864  * @head: Pointer to "struct tomoyo_io_buffer".
 865  *
 866  * Returns 0 on success, negative value otherwise.
 867  *
 868  * Caller holds tomoyo_read_lock().
 869  */
 870 static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
 871 {
 872         char *data = head->write_buf;
 873
 874         if (!strcmp(data, "manage_by_non_root")) {
 875                 tomoyo_manage_by_non_root = !head->w.is_delete;
 876                 return 0;
 877         }
 878         return tomoyo_update_manager_entry(data, head->w.is_delete);
 879 }
 880
 881 /**
 882  * tomoyo_read_manager - Read manager policy.
 883  *
 884  * @head: Pointer to "struct tomoyo_io_buffer".
 885  *
 886  * Caller holds tomoyo_read_lock().
 887  */
 888 static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
 889 {
 890         if (head->r.eof)
 891                 return;
 892         list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.
 893                              policy_list[TOMOYO_ID_MANAGER]) {
 894                 struct tomoyo_manager *ptr =
 895                         list_entry(head->r.acl, typeof(*ptr), head.list);
 896                 if (ptr->head.is_deleted)
 897                         continue;
 898                 if (!tomoyo_flush(head))
 899                         return;
 900                 tomoyo_set_string(head, ptr->manager->name);
 901                 tomoyo_set_lf(head);
 902         }
 903         head->r.eof = true;
 904 }
 905
 906 /**
 907  * tomoyo_manager - Check whether the current process is a policy manager.
 908  *
 909  * Returns true if the current process is permitted to modify policy
 910  * via /sys/kernel/security/tomoyo/ interface.
 911  *
 912  * Caller holds tomoyo_read_lock().
 913  */
 914 static bool tomoyo_manager(void)
 915 {
 916         struct tomoyo_manager *ptr;
 917         const char *exe;
 918         const struct task_struct *task = current;
 919         const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
 920         bool found = false;
 921
 922         if (!tomoyo_policy_loaded)
 923                 return true;
 924         if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
 925                 return false;
 926         list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
 927                                 policy_list[TOMOYO_ID_MANAGER], head.list) {
 928                 if (!ptr->head.is_deleted && ptr->is_domain
 929                     && !tomoyo_pathcmp(domainname, ptr->manager)) {
 930                         found = true;
 931                         break;
 932                 }
 933         }
 934         if (found)
 935                 return true;
 936         exe = tomoyo_get_exe();
 937         if (!exe)
 938                 return false;
 939         list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
 940                                 policy_list[TOMOYO_ID_MANAGER], head.list) {
 941                 if (!ptr->head.is_deleted && !ptr->is_domain
 942                     && !strcmp(exe, ptr->manager->name)) {
 943                         found = true;
 944                         break;
 945                 }
 946         }
 947         if (!found) { /* Reduce error messages. */
 948                 static pid_t last_pid;
 949                 const pid_t pid = current->pid;
 950                 if (last_pid != pid) {
 951                         printk(KERN_WARNING "%s ( %s ) is not permitted to "
 952                                "update policies.\n", domainname->name, exe);
 953                         last_pid = pid;
 954                 }
 955         }
 956         kfree(exe);
 957         return found;
 958 }
 959
 960 /**
 961  * tomoyo_select_domain - Parse select command.
 962  *
 963  * @head: Pointer to "struct tomoyo_io_buffer".
 964  * @data: String to parse.
 965  *
 966  * Returns true on success, false otherwise.
 967  *
 968  * Caller holds tomoyo_read_lock().
 969  */
 970 static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
 971                                  const char *data)
 972 {
 973         unsigned int pid;
 974         struct tomoyo_domain_info *domain = NULL;
 975         bool global_pid = false;
 976         if (strncmp(data, "select ", 7))
 977                 return false;
 978         data += 7;
 979         if (sscanf(data, "pid=%u", &pid) == 1 ||
 980             (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
 981                 struct task_struct *p;
 982                 rcu_read_lock();
 983                 read_lock(&tasklist_lock);
 984                 if (global_pid)
 985                         p = find_task_by_pid_ns(pid, &init_pid_ns);
 986                 else
 987                         p = find_task_by_vpid(pid);
 988                 if (p)
 989                         domain = tomoyo_real_domain(p);
 990                 read_unlock(&tasklist_lock);
 991                 rcu_read_unlock();
 992         } else if (!strncmp(data, "domain=", 7)) {
 993                 if (tomoyo_domain_def(data + 7))
 994                         domain = tomoyo_find_domain(data + 7);
 995         } else
 996                 return false;
 997         head->w.domain = domain;
 998         /* Accessing read_buf is safe because head->io_sem is held. */
 999         if (!head->read_buf)
1000                 return true; /* Do nothing if open(O_WRONLY). */
1001         memset(&head->r, 0, sizeof(head->r));
1002         head->r.print_this_domain_only = true;
1003         if (domain)
1004                 head->r.domain = &domain->list;
1005         else
1006                 head->r.eof = 1;
1007         tomoyo_io_printf(head, "# select %s\n", data);
1008         if (domain && domain->is_deleted)
1009                 tomoyo_io_printf(head, "# This is a deleted domain.\n");
1010         return true;
1011 }
1012
1013 /**
1014  * tomoyo_delete_domain - Delete a domain.
1015  *
1016  * @domainname: The name of domain.
1017  *
1018  * Returns 0.
1019  *
1020  * Caller holds tomoyo_read_lock().
1021  */
1022 static int tomoyo_delete_domain(char *domainname)
1023 {
1024         struct tomoyo_domain_info *domain;
1025         struct tomoyo_path_info name;
1026
1027         name.name = domainname;
1028         tomoyo_fill_path_info(&name);
1029         if (mutex_lock_interruptible(&tomoyo_policy_lock))
1030                 return 0;
1031         /* Is there an active domain? */
1032         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1033                 /* Never delete tomoyo_kernel_domain */
1034                 if (domain == &tomoyo_kernel_domain)
1035                         continue;
1036                 if (domain->is_deleted ||
1037                     tomoyo_pathcmp(domain->domainname, &name))
1038                         continue;
1039                 domain->is_deleted = true;
1040                 break;
1041         }
1042         mutex_unlock(&tomoyo_policy_lock);
1043         return 0;
1044 }
1045
1046 /**
1047  * tomoyo_write_domain2 - Write domain policy.
1048  *
1049  * @ns:        Pointer to "struct tomoyo_policy_namespace".
1050  * @list:      Pointer to "struct list_head".
1051  * @data:      Policy to be interpreted.
1052  * @is_delete: True if it is a delete request.
1053  *
1054  * Returns 0 on success, negative value otherwise.
1055  *
1056  * Caller holds tomoyo_read_lock().
1057  */
1058 static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
1059                                 struct list_head *list, char *data,
1060                                 const bool is_delete)
1061 {
1062         struct tomoyo_acl_param param = {
1063                 .ns = ns,
1064                 .list = list,
1065                 .data = data,
1066                 .is_delete = is_delete,
1067         };
1068         static const struct {
1069                 const char *keyword;
1070                 int (*write) (struct tomoyo_acl_param *);
1071         } tomoyo_callback[4] = {
1072                 { "file ", tomoyo_write_file },
1073                 { "network inet ", tomoyo_write_inet_network },
1074                 { "network unix ", tomoyo_write_unix_network },
1075                 { "misc ", tomoyo_write_misc },
1076         };
1077         u8 i;
1078
1079         for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) {
1080                 if (!tomoyo_str_starts(&param.data,
1081                                        tomoyo_callback[i].keyword))
1082                         continue;
1083                 return tomoyo_callback[i].write(&param);
1084         }
1085         return -EINVAL;
1086 }
1087
1088 /* String table for domain flags. */
1089 const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1090         [TOMOYO_DIF_QUOTA_WARNED]      = "quota_exceeded\n",
1091         [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1092 };
1093
1094 /**
1095  * tomoyo_write_domain - Write domain policy.
1096  *
1097  * @head: Pointer to "struct tomoyo_io_buffer".
1098  *
1099  * Returns 0 on success, negative value otherwise.
1100  *
1101  * Caller holds tomoyo_read_lock().
1102  */
1103 static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1104 {
1105         char *data = head->write_buf;
1106         struct tomoyo_policy_namespace *ns;
1107         struct tomoyo_domain_info *domain = head->w.domain;
1108         const bool is_delete = head->w.is_delete;
1109         bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1110         unsigned int profile;
1111         if (*data == '<') {
1112                 domain = NULL;
1113                 if (is_delete)
1114                         tomoyo_delete_domain(data);
1115                 else if (is_select)
1116                         domain = tomoyo_find_domain(data);
1117                 else
1118                         domain = tomoyo_assign_domain(data, false);
1119                 head->w.domain = domain;
1120                 return 0;
1121         }
1122         if (!domain)
1123                 return -EINVAL;
1124         ns = domain->ns;
1125         if (sscanf(data, "use_profile %u", &profile) == 1
1126             && profile < TOMOYO_MAX_PROFILES) {
1127                 if (!tomoyo_policy_loaded || ns->profile_ptr[profile])
1128                         domain->profile = (u8) profile;
1129                 return 0;
1130         }
1131         if (sscanf(data, "use_group %u\n", &profile) == 1
1132             && profile < TOMOYO_MAX_ACL_GROUPS) {
1133                 if (!is_delete)
1134                         domain->group = (u8) profile;
1135                 return 0;
1136         }
1137         for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) {
1138                 const char *cp = tomoyo_dif[profile];
1139                 if (strncmp(data, cp, strlen(cp) - 1))
1140                         continue;
1141                 domain->flags[profile] = !is_delete;
1142                 return 0;
1143         }
1144         return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1145                                     is_delete);
1146 }
1147
1148 /**
1149  * tomoyo_print_condition - Print condition part.
1150  *
1151  * @head: Pointer to "struct tomoyo_io_buffer".
1152  * @cond: Pointer to "struct tomoyo_condition".
1153  *
1154  * Returns true on success, false otherwise.
1155  */
1156 static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1157                                    const struct tomoyo_condition *cond)
1158 {
1159         switch (head->r.cond_step) {
1160         case 0:
1161                 head->r.cond_index = 0;
1162                 head->r.cond_step++;
1163                 /* fall through */
1164         case 1:
1165                 {
1166                         const u16 condc = cond->condc;
1167                         const struct tomoyo_condition_element *condp =
1168                                 (typeof(condp)) (cond + 1);
1169                         const struct tomoyo_number_union *numbers_p =
1170                                 (typeof(numbers_p)) (condp + condc);
1171                         const struct tomoyo_name_union *names_p =
1172                                 (typeof(names_p))
1173                                 (numbers_p + cond->numbers_count);
1174                         const struct tomoyo_argv *argv =
1175                                 (typeof(argv)) (names_p + cond->names_count);
1176                         const struct tomoyo_envp *envp =
1177                                 (typeof(envp)) (argv + cond->argc);
1178                         u16 skip;
1179                         for (skip = 0; skip < head->r.cond_index; skip++) {
1180                                 const u8 left = condp->left;
1181                                 const u8 right = condp->right;
1182                                 condp++;
1183                                 switch (left) {
1184                                 case TOMOYO_ARGV_ENTRY:
1185                                         argv++;
1186                                         continue;
1187                                 case TOMOYO_ENVP_ENTRY:
1188                                         envp++;
1189                                         continue;
1190                                 case TOMOYO_NUMBER_UNION:
1191                                         numbers_p++;
1192                                         break;
1193                                 }
1194                                 switch (right) {
1195                                 case TOMOYO_NAME_UNION:
1196                                         names_p++;
1197                                         break;
1198                                 case TOMOYO_NUMBER_UNION:
1199                                         numbers_p++;
1200                                         break;
1201                                 }
1202                         }
1203                         while (head->r.cond_index < condc) {
1204                                 const u8 match = condp->equals;
1205                                 const u8 left = condp->left;
1206                                 const u8 right = condp->right;
1207                                 if (!tomoyo_flush(head))
1208                                         return false;
1209                                 condp++;
1210                                 head->r.cond_index++;
1211                                 tomoyo_set_space(head);
1212                                 switch (left) {
1213                                 case TOMOYO_ARGV_ENTRY:
1214                                         tomoyo_io_printf(head,
1215                                                          "exec.argv[%lu]%s=\"",
1216                                                          argv->index, argv->
1217                                                          is_not ? "!" : "");
1218                                         tomoyo_set_string(head,
1219                                                           argv->value->name);
1220                                         tomoyo_set_string(head, "\"");
1221                                         argv++;
1222                                         continue;
1223                                 case TOMOYO_ENVP_ENTRY:
1224                                         tomoyo_set_string(head,
1225                                                           "exec.envp[\"");
1226                                         tomoyo_set_string(head,
1227                                                           envp->name->name);
1228                                         tomoyo_io_printf(head, "\"]%s=", envp->
1229                                                          is_not ? "!" : "");
1230                                         if (envp->value) {
1231                                                 tomoyo_set_string(head, "\"");
1232                                                 tomoyo_set_string(head, envp->
1233                                                                   value->name);
1234                                                 tomoyo_set_string(head, "\"");
1235                                         } else {
1236                                                 tomoyo_set_string(head,
1237                                                                   "NULL");
1238                                         }
1239                                         envp++;
1240                                         continue;
1241                                 case TOMOYO_NUMBER_UNION:
1242                                         tomoyo_print_number_union_nospace
1243                                                 (head, numbers_p++);
1244                                         break;
1245                                 default:
1246                                         tomoyo_set_string(head,
1247                                                tomoyo_condition_keyword[left]);
1248                                         break;
1249                                 }
1250                                 tomoyo_set_string(head, match ? "=" : "!=");
1251                                 switch (right) {
1252                                 case TOMOYO_NAME_UNION:
1253                                         tomoyo_print_name_union_quoted
1254                                                 (head, names_p++);
1255                                         break;
1256                                 case TOMOYO_NUMBER_UNION:
1257                                         tomoyo_print_number_union_nospace
1258                                                 (head, numbers_p++);
1259                                         break;
1260                                 default:
1261                                         tomoyo_set_string(head,
1262                                           tomoyo_condition_keyword[right]);
1263                                         break;
1264                                 }
1265                         }
1266                 }
1267                 head->r.cond_step++;
1268                 /* fall through */
1269         case 2:
1270                 if (!tomoyo_flush(head))
1271                         break;
1272                 head->r.cond_step++;
1273                 /* fall through */
1274         case 3:
1275                 tomoyo_set_lf(head);
1276                 return true;
1277         }
1278         return false;
1279 }
1280
1281 /**
1282  * tomoyo_set_group - Print "acl_group " header keyword and category name.
1283  *
1284  * @head:     Pointer to "struct tomoyo_io_buffer".
1285  * @category: Category name.
1286  *
1287  * Returns nothing.
1288  */
1289 static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1290                              const char *category)
1291 {
1292         if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1293                 tomoyo_print_namespace(head);
1294                 tomoyo_io_printf(head, "acl_group %u ",
1295                                  head->r.acl_group_index);
1296         }
1297         tomoyo_set_string(head, category);
1298 }
1299
1300 /**
1301  * tomoyo_print_entry - Print an ACL entry.
1302  *
1303  * @head: Pointer to "struct tomoyo_io_buffer".
1304  * @acl:  Pointer to an ACL entry.
1305  *
1306  * Returns true on success, false otherwise.
1307  */
1308 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1309                                struct tomoyo_acl_info *acl)
1310 {
1311         const u8 acl_type = acl->type;
1312         bool first = true;
1313         u8 bit;
1314
1315         if (head->r.print_cond_part)
1316                 goto print_cond_part;
1317         if (acl->is_deleted)
1318                 return true;
1319         if (!tomoyo_flush(head))
1320                 return false;
1321         else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1322                 struct tomoyo_path_acl *ptr =
1323                         container_of(acl, typeof(*ptr), head);
1324                 const u16 perm = ptr->perm;
1325                 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1326                         if (!(perm & (1 << bit)))
1327                                 continue;
1328                         if (head->r.print_transition_related_only &&
1329                             bit != TOMOYO_TYPE_EXECUTE)
1330                                 continue;
1331                         if (first) {
1332                                 tomoyo_set_group(head, "file ");
1333                                 first = false;
1334                         } else {
1335                                 tomoyo_set_slash(head);
1336                         }
1337                         tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1338                 }
1339                 if (first)
1340                         return true;
1341                 tomoyo_print_name_union(head, &ptr->name);
1342         } else if (head->r.print_transition_related_only) {
1343                 return true;
1344         } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1345                 struct tomoyo_path2_acl *ptr =
1346                         container_of(acl, typeof(*ptr), head);
1347                 const u8 perm = ptr->perm;
1348                 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1349                         if (!(perm & (1 << bit)))
1350                                 continue;
1351                         if (first) {
1352                                 tomoyo_set_group(head, "file ");
1353                                 first = false;
1354                         } else {
1355                                 tomoyo_set_slash(head);
1356                         }
1357                         tomoyo_set_string(head, tomoyo_mac_keywords
1358                                           [tomoyo_pp2mac[bit]]);
1359                 }
1360                 if (first)
1361                         return true;
1362                 tomoyo_print_name_union(head, &ptr->name1);
1363                 tomoyo_print_name_union(head, &ptr->name2);
1364         } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1365                 struct tomoyo_path_number_acl *ptr =
1366                         container_of(acl, typeof(*ptr), head);
1367                 const u8 perm = ptr->perm;
1368                 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1369                         if (!(perm & (1 << bit)))
1370                                 continue;
1371                         if (first) {
1372                                 tomoyo_set_group(head, "file ");
1373                                 first = false;
1374                         } else {
1375                                 tomoyo_set_slash(head);
1376                         }
1377                         tomoyo_set_string(head, tomoyo_mac_keywords
1378                                           [tomoyo_pn2mac[bit]]);
1379                 }
1380                 if (first)
1381                         return true;
1382                 tomoyo_print_name_union(head, &ptr->name);
1383                 tomoyo_print_number_union(head, &ptr->number);
1384         } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1385                 struct tomoyo_mkdev_acl *ptr =
1386                         container_of(acl, typeof(*ptr), head);
1387                 const u8 perm = ptr->perm;
1388                 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1389                         if (!(perm & (1 << bit)))
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_mac_keywords
1398                                           [tomoyo_pnnn2mac[bit]]);
1399                 }
1400                 if (first)
1401                         return true;
1402                 tomoyo_print_name_union(head, &ptr->name);
1403                 tomoyo_print_number_union(head, &ptr->mode);
1404                 tomoyo_print_number_union(head, &ptr->major);
1405                 tomoyo_print_number_union(head, &ptr->minor);
1406         } else if (acl_type == TOMOYO_TYPE_INET_ACL) {
1407                 struct tomoyo_inet_acl *ptr =
1408                         container_of(acl, typeof(*ptr), head);
1409                 const u8 perm = ptr->perm;
1410
1411                 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1412                         if (!(perm & (1 << bit)))
1413                                 continue;
1414                         if (first) {
1415                                 tomoyo_set_group(head, "network inet ");
1416                                 tomoyo_set_string(head, tomoyo_proto_keyword
1417                                                   [ptr->protocol]);
1418                                 tomoyo_set_space(head);
1419                                 first = false;
1420                         } else {
1421                                 tomoyo_set_slash(head);
1422                         }
1423                         tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1424                 }
1425                 if (first)
1426                         return true;
1427                 tomoyo_set_space(head);
1428                 if (ptr->address.group) {
1429                         tomoyo_set_string(head, "@");
1430                         tomoyo_set_string(head, ptr->address.group->group_name
1431                                           ->name);
1432                 } else {
1433                         char buf[128];
1434                         tomoyo_print_ip(buf, sizeof(buf), &ptr->address);
1435                         tomoyo_io_printf(head, "%s", buf);
1436                 }
1437                 tomoyo_print_number_union(head, &ptr->port);
1438         } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) {
1439                 struct tomoyo_unix_acl *ptr =
1440                         container_of(acl, typeof(*ptr), head);
1441                 const u8 perm = ptr->perm;
1442
1443                 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1444                         if (!(perm & (1 << bit)))
1445                                 continue;
1446                         if (first) {
1447                                 tomoyo_set_group(head, "network unix ");
1448                                 tomoyo_set_string(head, tomoyo_proto_keyword
1449                                                   [ptr->protocol]);
1450                                 tomoyo_set_space(head);
1451                                 first = false;
1452                         } else {
1453                                 tomoyo_set_slash(head);
1454                         }
1455                         tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1456                 }
1457                 if (first)
1458                         return true;
1459                 tomoyo_print_name_union(head, &ptr->name);
1460         } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1461                 struct tomoyo_mount_acl *ptr =
1462                         container_of(acl, typeof(*ptr), head);
1463                 tomoyo_set_group(head, "file mount");
1464                 tomoyo_print_name_union(head, &ptr->dev_name);
1465                 tomoyo_print_name_union(head, &ptr->dir_name);
1466                 tomoyo_print_name_union(head, &ptr->fs_type);
1467                 tomoyo_print_number_union(head, &ptr->flags);
1468         } else if (acl_type == TOMOYO_TYPE_ENV_ACL) {
1469                 struct tomoyo_env_acl *ptr =
1470                         container_of(acl, typeof(*ptr), head);
1471
1472                 tomoyo_set_group(head, "misc env ");
1473                 tomoyo_set_string(head, ptr->env->name);
1474         }
1475         if (acl->cond) {
1476                 head->r.print_cond_part = true;
1477                 head->r.cond_step = 0;
1478                 if (!tomoyo_flush(head))
1479                         return false;
1480 print_cond_part:
1481                 if (!tomoyo_print_condition(head, acl->cond))
1482                         return false;
1483                 head->r.print_cond_part = false;
1484         } else {
1485                 tomoyo_set_lf(head);
1486         }
1487         return true;
1488 }
1489
1490 /**
1491  * tomoyo_read_domain2 - Read domain policy.
1492  *
1493  * @head: Pointer to "struct tomoyo_io_buffer".
1494  * @list: Pointer to "struct list_head".
1495  *
1496  * Caller holds tomoyo_read_lock().
1497  *
1498  * Returns true on success, false otherwise.
1499  */
1500 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1501                                 struct list_head *list)
1502 {
1503         list_for_each_cookie(head->r.acl, list) {
1504                 struct tomoyo_acl_info *ptr =
1505                         list_entry(head->r.acl, typeof(*ptr), list);
1506                 if (!tomoyo_print_entry(head, ptr))
1507                         return false;
1508         }
1509         head->r.acl = NULL;
1510         return true;
1511 }
1512
1513 /**
1514  * tomoyo_read_domain - Read domain policy.
1515  *
1516  * @head: Pointer to "struct tomoyo_io_buffer".
1517  *
1518  * Caller holds tomoyo_read_lock().
1519  */
1520 static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1521 {
1522         if (head->r.eof)
1523                 return;
1524         list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1525                 struct tomoyo_domain_info *domain =
1526                         list_entry(head->r.domain, typeof(*domain), list);
1527                 switch (head->r.step) {
1528                         u8 i;
1529                 case 0:
1530                         if (domain->is_deleted &&
1531                             !head->r.print_this_domain_only)
1532                                 continue;
1533                         /* Print domainname and flags. */
1534                         tomoyo_set_string(head, domain->domainname->name);
1535                         tomoyo_set_lf(head);
1536                         tomoyo_io_printf(head, "use_profile %u\n",
1537                                          domain->profile);
1538                         tomoyo_io_printf(head, "use_group %u\n",
1539                                          domain->group);
1540                         for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1541                                 if (domain->flags[i])
1542                                         tomoyo_set_string(head, tomoyo_dif[i]);
1543                         head->r.step++;
1544                         tomoyo_set_lf(head);
1545                         /* fall through */
1546                 case 1:
1547                         if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1548                                 return;
1549                         head->r.step++;
1550                         if (!tomoyo_set_lf(head))
1551                                 return;
1552                         /* fall through */
1553                 case 2:
1554                         head->r.step = 0;
1555                         if (head->r.print_this_domain_only)
1556                                 goto done;
1557                 }
1558         }
1559  done:
1560         head->r.eof = true;
1561 }
1562
1563 /**
1564  * tomoyo_write_pid: Specify PID to obtain domainname.
1565  *
1566  * @head: Pointer to "struct tomoyo_io_buffer".
1567  *
1568  * Returns 0.
1569  */
1570 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1571 {
1572         head->r.eof = false;
1573         return 0;
1574 }
1575
1576 /**
1577  * tomoyo_read_pid - Get domainname of the specified PID.
1578  *
1579  * @head: Pointer to "struct tomoyo_io_buffer".
1580  *
1581  * Returns the domainname which the specified PID is in on success,
1582  * empty string otherwise.
1583  * The PID is specified by tomoyo_write_pid() so that the user can obtain
1584  * using read()/write() interface rather than sysctl() interface.
1585  */
1586 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1587 {
1588         char *buf = head->write_buf;
1589         bool global_pid = false;
1590         unsigned int pid;
1591         struct task_struct *p;
1592         struct tomoyo_domain_info *domain = NULL;
1593
1594         /* Accessing write_buf is safe because head->io_sem is held. */
1595         if (!buf) {
1596                 head->r.eof = true;
1597                 return; /* Do nothing if open(O_RDONLY). */
1598         }
1599         if (head->r.w_pos || head->r.eof)
1600                 return;
1601         head->r.eof = true;
1602         if (tomoyo_str_starts(&buf, "global-pid "))
1603                 global_pid = true;
1604         pid = (unsigned int) simple_strtoul(buf, NULL, 10);
1605         rcu_read_lock();
1606         read_lock(&tasklist_lock);
1607         if (global_pid)
1608                 p = find_task_by_pid_ns(pid, &init_pid_ns);
1609         else
1610                 p = find_task_by_vpid(pid);
1611         if (p)
1612                 domain = tomoyo_real_domain(p);
1613         read_unlock(&tasklist_lock);
1614         rcu_read_unlock();
1615         if (!domain)
1616                 return;
1617         tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1618         tomoyo_set_string(head, domain->domainname->name);
1619 }
1620
1621 /* String table for domain transition control keywords. */
1622 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1623         [TOMOYO_TRANSITION_CONTROL_NO_RESET]      = "no_reset_domain ",
1624         [TOMOYO_TRANSITION_CONTROL_RESET]         = "reset_domain ",
1625         [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1626         [TOMOYO_TRANSITION_CONTROL_INITIALIZE]    = "initialize_domain ",
1627         [TOMOYO_TRANSITION_CONTROL_NO_KEEP]       = "no_keep_domain ",
1628         [TOMOYO_TRANSITION_CONTROL_KEEP]          = "keep_domain ",
1629 };
1630
1631 /* String table for grouping keywords. */
1632 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1633         [TOMOYO_PATH_GROUP]    = "path_group ",
1634         [TOMOYO_NUMBER_GROUP]  = "number_group ",
1635         [TOMOYO_ADDRESS_GROUP] = "address_group ",
1636 };
1637
1638 /**
1639  * tomoyo_write_exception - Write exception policy.
1640  *
1641  * @head: Pointer to "struct tomoyo_io_buffer".
1642  *
1643  * Returns 0 on success, negative value otherwise.
1644  *
1645  * Caller holds tomoyo_read_lock().
1646  */
1647 static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1648 {
1649         const bool is_delete = head->w.is_delete;
1650         struct tomoyo_acl_param param = {
1651                 .ns = head->w.ns,
1652                 .is_delete = is_delete,
1653                 .data = head->write_buf,
1654         };
1655         u8 i;
1656         if (tomoyo_str_starts(&param.data, "aggregator "))
1657                 return tomoyo_write_aggregator(&param);
1658         for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1659                 if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
1660                         return tomoyo_write_transition_control(&param, i);
1661         for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1662                 if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
1663                         return tomoyo_write_group(&param, i);
1664         if (tomoyo_str_starts(&param.data, "acl_group ")) {
1665                 unsigned int group;
1666                 char *data;
1667                 group = simple_strtoul(param.data, &data, 10);
1668                 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1669                         return tomoyo_write_domain2
1670                                 (head->w.ns, &head->w.ns->acl_group[group],
1671                                  data, is_delete);
1672         }
1673         return -EINVAL;
1674 }
1675
1676 /**
1677  * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
1678  *
1679  * @head: Pointer to "struct tomoyo_io_buffer".
1680  * @idx:  Index number.
1681  *
1682  * Returns true on success, false otherwise.
1683  *
1684  * Caller holds tomoyo_read_lock().
1685  */
1686 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1687 {
1688         struct tomoyo_policy_namespace *ns =
1689                 container_of(head->r.ns, typeof(*ns), namespace_list);
1690         struct list_head *list = &ns->group_list[idx];
1691         list_for_each_cookie(head->r.group, list) {
1692                 struct tomoyo_group *group =
1693                         list_entry(head->r.group, typeof(*group), head.list);
1694                 list_for_each_cookie(head->r.acl, &group->member_list) {
1695                         struct tomoyo_acl_head *ptr =
1696                                 list_entry(head->r.acl, typeof(*ptr), list);
1697                         if (ptr->is_deleted)
1698                                 continue;
1699                         if (!tomoyo_flush(head))
1700                                 return false;
1701                         tomoyo_print_namespace(head);
1702                         tomoyo_set_string(head, tomoyo_group_name[idx]);
1703                         tomoyo_set_string(head, group->group_name->name);
1704                         if (idx == TOMOYO_PATH_GROUP) {
1705                                 tomoyo_set_space(head);
1706                                 tomoyo_set_string(head, container_of
1707                                                (ptr, struct tomoyo_path_group,
1708                                                 head)->member_name->name);
1709                         } else if (idx == TOMOYO_NUMBER_GROUP) {
1710                                 tomoyo_print_number_union(head, &container_of
1711                                                           (ptr,
1712                                                    struct tomoyo_number_group,
1713                                                            head)->number);
1714                         } else if (idx == TOMOYO_ADDRESS_GROUP) {
1715                                 char buffer[128];
1716
1717                                 struct tomoyo_address_group *member =
1718                                         container_of(ptr, typeof(*member),
1719                                                      head);
1720                                 tomoyo_print_ip(buffer, sizeof(buffer),
1721                                                 &member->address);
1722                                 tomoyo_io_printf(head, " %s", buffer);
1723                         }
1724                         tomoyo_set_lf(head);
1725                 }
1726                 head->r.acl = NULL;
1727         }
1728         head->r.group = NULL;
1729         return true;
1730 }
1731
1732 /**
1733  * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1734  *
1735  * @head: Pointer to "struct tomoyo_io_buffer".
1736  * @idx:  Index number.
1737  *
1738  * Returns true on success, false otherwise.
1739  *
1740  * Caller holds tomoyo_read_lock().
1741  */
1742 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1743 {
1744         struct tomoyo_policy_namespace *ns =
1745                 container_of(head->r.ns, typeof(*ns), namespace_list);
1746         struct list_head *list = &ns->policy_list[idx];
1747         list_for_each_cookie(head->r.acl, list) {
1748                 struct tomoyo_acl_head *acl =
1749                         container_of(head->r.acl, typeof(*acl), list);
1750                 if (acl->is_deleted)
1751                         continue;
1752                 if (!tomoyo_flush(head))
1753                         return false;
1754                 switch (idx) {
1755                 case TOMOYO_ID_TRANSITION_CONTROL:
1756                         {
1757                                 struct tomoyo_transition_control *ptr =
1758                                         container_of(acl, typeof(*ptr), head);
1759                                 tomoyo_print_namespace(head);
1760                                 tomoyo_set_string(head, tomoyo_transition_type
1761                                                   [ptr->type]);
1762                                 tomoyo_set_string(head, ptr->program ?
1763                                                   ptr->program->name : "any");
1764                                 tomoyo_set_string(head, " from ");
1765                                 tomoyo_set_string(head, ptr->domainname ?
1766                                                   ptr->domainname->name :
1767                                                   "any");
1768                         }
1769                         break;
1770                 case TOMOYO_ID_AGGREGATOR:
1771                         {
1772                                 struct tomoyo_aggregator *ptr =
1773                                         container_of(acl, typeof(*ptr), head);
1774                                 tomoyo_print_namespace(head);
1775                                 tomoyo_set_string(head, "aggregator ");
1776                                 tomoyo_set_string(head,
1777                                                   ptr->original_name->name);
1778                                 tomoyo_set_space(head);
1779                                 tomoyo_set_string(head,
1780                                                ptr->aggregated_name->name);
1781                         }
1782                         break;
1783                 default:
1784                         continue;
1785                 }
1786                 tomoyo_set_lf(head);
1787         }
1788         head->r.acl = NULL;
1789         return true;
1790 }
1791
1792 /**
1793  * tomoyo_read_exception - Read exception policy.
1794  *
1795  * @head: Pointer to "struct tomoyo_io_buffer".
1796  *
1797  * Caller holds tomoyo_read_lock().
1798  */
1799 static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1800 {
1801         struct tomoyo_policy_namespace *ns =
1802                 container_of(head->r.ns, typeof(*ns), namespace_list);
1803         if (head->r.eof)
1804                 return;
1805         while (head->r.step < TOMOYO_MAX_POLICY &&
1806                tomoyo_read_policy(head, head->r.step))
1807                 head->r.step++;
1808         if (head->r.step < TOMOYO_MAX_POLICY)
1809                 return;
1810         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1811                tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1812                 head->r.step++;
1813         if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1814                 return;
1815         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1816                + TOMOYO_MAX_ACL_GROUPS) {
1817                 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1818                         - TOMOYO_MAX_GROUP;
1819                 if (!tomoyo_read_domain2(head, &ns->acl_group
1820                                          [head->r.acl_group_index]))
1821                         return;
1822                 head->r.step++;
1823         }
1824         head->r.eof = true;
1825 }
1826
1827 /* Wait queue for kernel -> userspace notification. */
1828 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1829 /* Wait queue for userspace -> kernel notification. */
1830 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1831
1832 /* Structure for query. */
1833 struct tomoyo_query {
1834         struct list_head list;
1835         char *query;
1836         size_t query_len;
1837         unsigned int serial;
1838         u8 timer;
1839         u8 answer;
1840         u8 retry;
1841 };
1842
1843 /* The list for "struct tomoyo_query". */
1844 static LIST_HEAD(tomoyo_query_list);
1845
1846 /* Lock for manipulating tomoyo_query_list. */
1847 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1848
1849 /*
1850  * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1851  * interface.
1852  */
1853 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1854
1855 /**
1856  * tomoyo_truncate - Truncate a line.
1857  *
1858  * @str: String to truncate.
1859  *
1860  * Returns length of truncated @str.
1861  */
1862 static int tomoyo_truncate(char *str)
1863 {
1864         char *start = str;
1865         while (*(unsigned char *) str > (unsigned char) ' ')
1866                 str++;
1867         *str = '\0';
1868         return strlen(start) + 1;
1869 }
1870
1871 /**
1872  * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1873  *
1874  * @domain: Pointer to "struct tomoyo_domain_info".
1875  * @header: Lines containing ACL.
1876  *
1877  * Returns nothing.
1878  */
1879 static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
1880 {
1881         char *buffer;
1882         char *realpath = NULL;
1883         char *argv0 = NULL;
1884         char *symlink = NULL;
1885         char *cp = strchr(header, '\n');
1886         int len;
1887         if (!cp)
1888                 return;
1889         cp = strchr(cp + 1, '\n');
1890         if (!cp)
1891                 return;
1892         *cp++ = '\0';
1893         len = strlen(cp) + 1;
1894         /* strstr() will return NULL if ordering is wrong. */
1895         if (*cp == 'f') {
1896                 argv0 = strstr(header, " argv[]={ \"");
1897                 if (argv0) {
1898                         argv0 += 10;
1899                         len += tomoyo_truncate(argv0) + 14;
1900                 }
1901                 realpath = strstr(header, " exec={ realpath=\"");
1902                 if (realpath) {
1903                         realpath += 8;
1904                         len += tomoyo_truncate(realpath) + 6;
1905                 }
1906                 symlink = strstr(header, " symlink.target=\"");
1907                 if (symlink)
1908                         len += tomoyo_truncate(symlink + 1) + 1;
1909         }
1910         buffer = kmalloc(len, GFP_NOFS);
1911         if (!buffer)
1912                 return;
1913         snprintf(buffer, len - 1, "%s", cp);
1914         if (realpath)
1915                 tomoyo_addprintf(buffer, len, " exec.%s", realpath);
1916         if (argv0)
1917                 tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
1918         if (symlink)
1919                 tomoyo_addprintf(buffer, len, "%s", symlink);
1920         tomoyo_normalize_line(buffer);
1921         if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
1922                                   false))
1923                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
1924         kfree(buffer);
1925 }
1926
1927 /**
1928  * tomoyo_supervisor - Ask for the supervisor's decision.
1929  *
1930  * @r:   Pointer to "struct tomoyo_request_info".
1931  * @fmt: The printf()'s format string, followed by parameters.
1932  *
1933  * Returns 0 if the supervisor decided to permit the access request which
1934  * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1935  * supervisor decided to retry the access request which violated the policy in
1936  * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1937  */
1938 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1939 {
1940         va_list args;
1941         int error;
1942         int len;
1943         static unsigned int tomoyo_serial;
1944         struct tomoyo_query entry = { };
1945         bool quota_exceeded = false;
1946         va_start(args, fmt);
1947         len = vsnprintf((char *) &len, 1, fmt, args) + 1;
1948         va_end(args);
1949         /* Write /sys/kernel/security/tomoyo/audit. */
1950         va_start(args, fmt);
1951         tomoyo_write_log2(r, len, fmt, args);
1952         va_end(args);
1953         /* Nothing more to do if granted. */
1954         if (r->granted)
1955                 return 0;
1956         if (r->mode)
1957                 tomoyo_update_stat(r->mode);
1958         switch (r->mode) {
1959         case TOMOYO_CONFIG_ENFORCING:
1960                 error = -EPERM;
1961                 if (atomic_read(&tomoyo_query_observers))
1962                         break;
1963                 goto out;
1964         case TOMOYO_CONFIG_LEARNING:
1965                 error = 0;
1966                 /* Check max_learning_entry parameter. */
1967                 if (tomoyo_domain_quota_is_ok(r))
1968                         break;
1969                 /* fall through */
1970         default:
1971                 return 0;
1972         }
1973         /* Get message. */
1974         va_start(args, fmt);
1975         entry.query = tomoyo_init_log(r, len, fmt, args);
1976         va_end(args);
1977         if (!entry.query)
1978                 goto out;
1979         entry.query_len = strlen(entry.query) + 1;
1980         if (!error) {
1981                 tomoyo_add_entry(r->domain, entry.query);
1982                 goto out;
1983         }
1984         len = tomoyo_round2(entry.query_len);
1985         spin_lock(&tomoyo_query_list_lock);
1986         if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
1987             tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
1988             >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
1989                 quota_exceeded = true;
1990         } else {
1991                 entry.serial = tomoyo_serial++;
1992                 entry.retry = r->retry;
1993                 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
1994                 list_add_tail(&entry.list, &tomoyo_query_list);
1995         }
1996         spin_unlock(&tomoyo_query_list_lock);
1997         if (quota_exceeded)
1998                 goto out;
1999         /* Give 10 seconds for supervisor's opinion. */
2000         while (entry.timer < 10) {
2001                 wake_up_all(&tomoyo_query_wait);
2002                 if (wait_event_interruptible_timeout
2003                     (tomoyo_answer_wait, entry.answer ||
2004                      !atomic_read(&tomoyo_query_observers), HZ))
2005                         break;
2006                 else
2007                         entry.timer++;
2008         }
2009         spin_lock(&tomoyo_query_list_lock);
2010         list_del(&entry.list);
2011         tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
2012         spin_unlock(&tomoyo_query_list_lock);
2013         switch (entry.answer) {
2014         case 3: /* Asked to retry by administrator. */
2015                 error = TOMOYO_RETRY_REQUEST;
2016                 r->retry++;
2017                 break;
2018         case 1:
2019                 /* Granted by administrator. */
2020                 error = 0;
2021                 break;
2022         default:
2023                 /* Timed out or rejected by administrator. */
2024                 break;
2025         }
2026 out:
2027         kfree(entry.query);
2028         return error;
2029 }
2030
2031 /**
2032  * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
2033  *
2034  * @file: Pointer to "struct file".
2035  * @wait: Pointer to "poll_table".
2036  *
2037  * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
2038  *
2039  * Waits for access requests which violated policy in enforcing mode.
2040  */
2041 static int tomoyo_poll_query(struct file *file, poll_table *wait)
2042 {
2043         struct list_head *tmp;
2044         bool found = false;
2045         u8 i;
2046         for (i = 0; i < 2; i++) {
2047                 spin_lock(&tomoyo_query_list_lock);
2048                 list_for_each(tmp, &tomoyo_query_list) {
2049                         struct tomoyo_query *ptr =
2050                                 list_entry(tmp, typeof(*ptr), list);
2051                         if (ptr->answer)
2052                                 continue;
2053                         found = true;
2054                         break;
2055                 }
2056                 spin_unlock(&tomoyo_query_list_lock);
2057                 if (found)
2058                         return POLLIN | POLLRDNORM;
2059                 if (i)
2060                         break;
2061                 poll_wait(file, &tomoyo_query_wait, wait);
2062         }
2063         return 0;
2064 }
2065
2066 /**
2067  * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
2068  *
2069  * @head: Pointer to "struct tomoyo_io_buffer".
2070  */
2071 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
2072 {
2073         struct list_head *tmp;
2074         unsigned int pos = 0;
2075         size_t len = 0;
2076         char *buf;
2077         if (head->r.w_pos)
2078                 return;
2079         if (head->read_buf) {
2080                 kfree(head->read_buf);
2081                 head->read_buf = NULL;
2082         }
2083         spin_lock(&tomoyo_query_list_lock);
2084         list_for_each(tmp, &tomoyo_query_list) {
2085                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2086                 if (ptr->answer)
2087                         continue;
2088                 if (pos++ != head->r.query_index)
2089                         continue;
2090                 len = ptr->query_len;
2091                 break;
2092         }
2093         spin_unlock(&tomoyo_query_list_lock);
2094         if (!len) {
2095                 head->r.query_index = 0;
2096                 return;
2097         }
2098         buf = kzalloc(len + 32, GFP_NOFS);
2099         if (!buf)
2100                 return;
2101         pos = 0;
2102         spin_lock(&tomoyo_query_list_lock);
2103         list_for_each(tmp, &tomoyo_query_list) {
2104                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2105                 if (ptr->answer)
2106                         continue;
2107                 if (pos++ != head->r.query_index)
2108                         continue;
2109                 /*
2110                  * Some query can be skipped because tomoyo_query_list
2111                  * can change, but I don't care.
2112                  */
2113                 if (len == ptr->query_len)
2114                         snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
2115                                  ptr->retry, ptr->query);
2116                 break;
2117         }
2118         spin_unlock(&tomoyo_query_list_lock);
2119         if (buf[0]) {
2120                 head->read_buf = buf;
2121                 head->r.w[head->r.w_pos++] = buf;
2122                 head->r.query_index++;
2123         } else {
2124                 kfree(buf);
2125         }
2126 }
2127
2128 /**
2129  * tomoyo_write_answer - Write the supervisor's decision.
2130  *
2131  * @head: Pointer to "struct tomoyo_io_buffer".
2132  *
2133  * Returns 0 on success, -EINVAL otherwise.
2134  */
2135 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
2136 {
2137         char *data = head->write_buf;
2138         struct list_head *tmp;
2139         unsigned int serial;
2140         unsigned int answer;
2141         spin_lock(&tomoyo_query_list_lock);
2142         list_for_each(tmp, &tomoyo_query_list) {
2143                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2144                 ptr->timer = 0;
2145         }
2146         spin_unlock(&tomoyo_query_list_lock);
2147         if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
2148                 return -EINVAL;
2149         spin_lock(&tomoyo_query_list_lock);
2150         list_for_each(tmp, &tomoyo_query_list) {
2151                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2152                 if (ptr->serial != serial)
2153                         continue;
2154                 if (!ptr->answer)
2155                         ptr->answer = answer;
2156                 break;
2157         }
2158         spin_unlock(&tomoyo_query_list_lock);
2159         return 0;
2160 }
2161
2162 /**
2163  * tomoyo_read_version: Get version.
2164  *
2165  * @head: Pointer to "struct tomoyo_io_buffer".
2166  *
2167  * Returns version information.
2168  */
2169 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2170 {
2171         if (!head->r.eof) {
2172                 tomoyo_io_printf(head, "2.4.0");
2173                 head->r.eof = true;
2174         }
2175 }
2176
2177 /**
2178  * tomoyo_read_self_domain - Get the current process's domainname.
2179  *
2180  * @head: Pointer to "struct tomoyo_io_buffer".
2181  *
2182  * Returns the current process's domainname.
2183  */
2184 static void tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
2185 {
2186         if (!head->r.eof) {
2187                 /*
2188                  * tomoyo_domain()->domainname != NULL
2189                  * because every process belongs to a domain and
2190                  * the domain's name cannot be NULL.
2191                  */
2192                 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
2193                 head->r.eof = true;
2194         }
2195 }
2196
2197 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2198 static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2199         [TOMOYO_STAT_POLICY_UPDATES]    = "update:",
2200         [TOMOYO_STAT_POLICY_LEARNING]   = "violation in learning mode:",
2201         [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2202         [TOMOYO_STAT_POLICY_ENFORCING]  = "violation in enforcing mode:",
2203 };
2204
2205 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2206 static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2207         [TOMOYO_MEMORY_POLICY] = "policy:",
2208         [TOMOYO_MEMORY_AUDIT]  = "audit log:",
2209         [TOMOYO_MEMORY_QUERY]  = "query message:",
2210 };
2211
2212 /* Timestamp counter for last updated. */
2213 static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2214 /* Counter for number of updates. */
2215 static unsigned int tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2216
2217 /**
2218  * tomoyo_update_stat - Update statistic counters.
2219  *
2220  * @index: Index for policy type.
2221  *
2222  * Returns nothing.
2223  */
2224 void tomoyo_update_stat(const u8 index)
2225 {
2226         struct timeval tv;
2227         do_gettimeofday(&tv);
2228         /*
2229          * I don't use atomic operations because race condition is not fatal.
2230          */
2231         tomoyo_stat_updated[index]++;
2232         tomoyo_stat_modified[index] = tv.tv_sec;
2233 }
2234
2235 /**
2236  * tomoyo_read_stat - Read statistic data.
2237  *
2238  * @head: Pointer to "struct tomoyo_io_buffer".
2239  *
2240  * Returns nothing.
2241  */
2242 static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2243 {
2244         u8 i;
2245         unsigned int total = 0;
2246         if (head->r.eof)
2247                 return;
2248         for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2249                 tomoyo_io_printf(head, "Policy %-30s %10u",
2250                                  tomoyo_policy_headers[i],
2251                                  tomoyo_stat_updated[i]);
2252                 if (tomoyo_stat_modified[i]) {
2253                         struct tomoyo_time stamp;
2254                         tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2255                         tomoyo_io_printf(head, " (Last: %04u/%02u/%02u "
2256                                          "%02u:%02u:%02u)",
2257                                          stamp.year, stamp.month, stamp.day,
2258                                          stamp.hour, stamp.min, stamp.sec);
2259                 }
2260                 tomoyo_set_lf(head);
2261         }
2262         for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2263                 unsigned int used = tomoyo_memory_used[i];
2264                 total += used;
2265                 tomoyo_io_printf(head, "Memory used by %-22s %10u",
2266                                  tomoyo_memory_headers[i], used);
2267                 used = tomoyo_memory_quota[i];
2268                 if (used)
2269                         tomoyo_io_printf(head, " (Quota: %10u)", used);
2270                 tomoyo_set_lf(head);
2271         }
2272         tomoyo_io_printf(head, "Total memory used:                    %10u\n",
2273                          total);
2274         head->r.eof = true;
2275 }
2276
2277 /**
2278  * tomoyo_write_stat - Set memory quota.
2279  *
2280  * @head: Pointer to "struct tomoyo_io_buffer".
2281  *
2282  * Returns 0.
2283  */
2284 static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2285 {
2286         char *data = head->write_buf;
2287         u8 i;
2288         if (tomoyo_str_starts(&data, "Memory used by "))
2289                 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2290                         if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2291                                 sscanf(data, "%u", &tomoyo_memory_quota[i]);
2292         return 0;
2293 }
2294
2295 /**
2296  * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2297  *
2298  * @type: Type of interface.
2299  * @file: Pointer to "struct file".
2300  *
2301  * Returns 0 on success, negative value otherwise.
2302  */
2303 int tomoyo_open_control(const u8 type, struct file *file)
2304 {
2305         struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2306
2307         if (!head)
2308                 return -ENOMEM;
2309         mutex_init(&head->io_sem);
2310         head->type = type;
2311         switch (type) {
2312         case TOMOYO_DOMAINPOLICY:
2313                 /* /sys/kernel/security/tomoyo/domain_policy */
2314                 head->write = tomoyo_write_domain;
2315                 head->read = tomoyo_read_domain;
2316                 break;
2317         case TOMOYO_EXCEPTIONPOLICY:
2318                 /* /sys/kernel/security/tomoyo/exception_policy */
2319                 head->write = tomoyo_write_exception;
2320                 head->read = tomoyo_read_exception;
2321                 break;
2322         case TOMOYO_AUDIT:
2323                 /* /sys/kernel/security/tomoyo/audit */
2324                 head->poll = tomoyo_poll_log;
2325                 head->read = tomoyo_read_log;
2326                 break;
2327         case TOMOYO_SELFDOMAIN:
2328                 /* /sys/kernel/security/tomoyo/self_domain */
2329                 head->read = tomoyo_read_self_domain;
2330                 break;
2331         case TOMOYO_PROCESS_STATUS:
2332                 /* /sys/kernel/security/tomoyo/.process_status */
2333                 head->write = tomoyo_write_pid;
2334                 head->read = tomoyo_read_pid;
2335                 break;
2336         case TOMOYO_VERSION:
2337                 /* /sys/kernel/security/tomoyo/version */
2338                 head->read = tomoyo_read_version;
2339                 head->readbuf_size = 128;
2340                 break;
2341         case TOMOYO_STAT:
2342                 /* /sys/kernel/security/tomoyo/stat */
2343                 head->write = tomoyo_write_stat;
2344                 head->read = tomoyo_read_stat;
2345                 head->readbuf_size = 1024;
2346                 break;
2347         case TOMOYO_PROFILE:
2348                 /* /sys/kernel/security/tomoyo/profile */
2349                 head->write = tomoyo_write_profile;
2350                 head->read = tomoyo_read_profile;
2351                 break;
2352         case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2353                 head->poll = tomoyo_poll_query;
2354                 head->write = tomoyo_write_answer;
2355                 head->read = tomoyo_read_query;
2356                 break;
2357         case TOMOYO_MANAGER:
2358                 /* /sys/kernel/security/tomoyo/manager */
2359                 head->write = tomoyo_write_manager;
2360                 head->read = tomoyo_read_manager;
2361                 break;
2362         }
2363         if (!(file->f_mode & FMODE_READ)) {
2364                 /*
2365                  * No need to allocate read_buf since it is not opened
2366                  * for reading.
2367                  */
2368                 head->read = NULL;
2369                 head->poll = NULL;
2370         } else if (!head->poll) {
2371                 /* Don't allocate read_buf for poll() access. */
2372                 if (!head->readbuf_size)
2373                         head->readbuf_size = 4096 * 2;
2374                 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2375                 if (!head->read_buf) {
2376                         kfree(head);
2377                         return -ENOMEM;
2378                 }
2379         }
2380         if (!(file->f_mode & FMODE_WRITE)) {
2381                 /*
2382                  * No need to allocate write_buf since it is not opened
2383                  * for writing.
2384                  */
2385                 head->write = NULL;
2386         } else if (head->write) {
2387                 head->writebuf_size = 4096 * 2;
2388                 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2389                 if (!head->write_buf) {
2390                         kfree(head->read_buf);
2391                         kfree(head);
2392                         return -ENOMEM;
2393                 }
2394         }
2395         /*
2396          * If the file is /sys/kernel/security/tomoyo/query , increment the
2397          * observer counter.
2398          * The obserber counter is used by tomoyo_supervisor() to see if
2399          * there is some process monitoring /sys/kernel/security/tomoyo/query.
2400          */
2401         if (type == TOMOYO_QUERY)
2402                 atomic_inc(&tomoyo_query_observers);
2403         file->private_data = head;
2404         tomoyo_notify_gc(head, true);
2405         return 0;
2406 }
2407
2408 /**
2409  * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2410  *
2411  * @file: Pointer to "struct file".
2412  * @wait: Pointer to "poll_table".
2413  *
2414  * Waits for read readiness.
2415  * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd and
2416  * /sys/kernel/security/tomoyo/audit is handled by /usr/sbin/tomoyo-auditd.
2417  */
2418 int tomoyo_poll_control(struct file *file, poll_table *wait)
2419 {
2420         struct tomoyo_io_buffer *head = file->private_data;
2421         if (!head->poll)
2422                 return -ENOSYS;
2423         return head->poll(file, wait);
2424 }
2425
2426 /**
2427  * tomoyo_set_namespace_cursor - Set namespace to read.
2428  *
2429  * @head: Pointer to "struct tomoyo_io_buffer".
2430  *
2431  * Returns nothing.
2432  */
2433 static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2434 {
2435         struct list_head *ns;
2436         if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2437             head->type != TOMOYO_PROFILE)
2438                 return;
2439         /*
2440          * If this is the first read, or reading previous namespace finished
2441          * and has more namespaces to read, update the namespace cursor.
2442          */
2443         ns = head->r.ns;
2444         if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2445                 /* Clearing is OK because tomoyo_flush() returned true. */
2446                 memset(&head->r, 0, sizeof(head->r));
2447                 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2448         }
2449 }
2450
2451 /**
2452  * tomoyo_has_more_namespace - Check for unread namespaces.
2453  *
2454  * @head: Pointer to "struct tomoyo_io_buffer".
2455  *
2456  * Returns true if we have more entries to print, false otherwise.
2457  */
2458 static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2459 {
2460         return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2461                 head->type == TOMOYO_PROFILE) && head->r.eof &&
2462                 head->r.ns->next != &tomoyo_namespace_list;
2463 }
2464
2465 /**
2466  * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2467  *
2468  * @head:       Pointer to "struct tomoyo_io_buffer".
2469  * @buffer:     Poiner to buffer to write to.
2470  * @buffer_len: Size of @buffer.
2471  *
2472  * Returns bytes read on success, negative value otherwise.
2473  */
2474 ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2475                             const int buffer_len)
2476 {
2477         int len;
2478         int idx;
2479
2480         if (!head->read)
2481                 return -ENOSYS;
2482         if (mutex_lock_interruptible(&head->io_sem))
2483                 return -EINTR;
2484         head->read_user_buf = buffer;
2485         head->read_user_buf_avail = buffer_len;
2486         idx = tomoyo_read_lock();
2487         if (tomoyo_flush(head))
2488                 /* Call the policy handler. */
2489                 do {
2490                         tomoyo_set_namespace_cursor(head);
2491                         head->read(head);
2492                 } while (tomoyo_flush(head) &&
2493                          tomoyo_has_more_namespace(head));
2494         tomoyo_read_unlock(idx);
2495         len = head->read_user_buf - buffer;
2496         mutex_unlock(&head->io_sem);
2497         return len;
2498 }
2499
2500 /**
2501  * tomoyo_parse_policy - Parse a policy line.
2502  *
2503  * @head: Poiter to "struct tomoyo_io_buffer".
2504  * @line: Line to parse.
2505  *
2506  * Returns 0 on success, negative value otherwise.
2507  *
2508  * Caller holds tomoyo_read_lock().
2509  */
2510 static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2511 {
2512         /* Delete request? */
2513         head->w.is_delete = !strncmp(line, "delete ", 7);
2514         if (head->w.is_delete)
2515                 memmove(line, line + 7, strlen(line + 7) + 1);
2516         /* Selecting namespace to update. */
2517         if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2518             head->type == TOMOYO_PROFILE) {
2519                 if (*line == '<') {
2520                         char *cp = strchr(line, ' ');
2521                         if (cp) {
2522                                 *cp++ = '\0';
2523                                 head->w.ns = tomoyo_assign_namespace(line);
2524                                 memmove(line, cp, strlen(cp) + 1);
2525                         } else
2526                                 head->w.ns = NULL;
2527                 } else
2528                         head->w.ns = &tomoyo_kernel_namespace;
2529                 /* Don't allow updating if namespace is invalid. */
2530                 if (!head->w.ns)
2531                         return -ENOENT;
2532         }
2533         /* Do the update. */
2534         return head->write(head);
2535 }
2536
2537 /**
2538  * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2539  *
2540  * @head:       Pointer to "struct tomoyo_io_buffer".
2541  * @buffer:     Pointer to buffer to read from.
2542  * @buffer_len: Size of @buffer.
2543  *
2544  * Returns @buffer_len on success, negative value otherwise.
2545  */
2546 ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2547                              const char __user *buffer, const int buffer_len)
2548 {
2549         int error = buffer_len;
2550         size_t avail_len = buffer_len;
2551         char *cp0 = head->write_buf;
2552         int idx;
2553         if (!head->write)
2554                 return -ENOSYS;
2555         if (!access_ok(VERIFY_READ, buffer, buffer_len))
2556                 return -EFAULT;
2557         if (mutex_lock_interruptible(&head->io_sem))
2558                 return -EINTR;
2559         idx = tomoyo_read_lock();
2560         /* Read a line and dispatch it to the policy handler. */
2561         while (avail_len > 0) {
2562                 char c;
2563                 if (head->w.avail >= head->writebuf_size - 1) {
2564                         const int len = head->writebuf_size * 2;
2565                         char *cp = kzalloc(len, GFP_NOFS);
2566                         if (!cp) {
2567                                 error = -ENOMEM;
2568                                 break;
2569                         }
2570                         memmove(cp, cp0, head->w.avail);
2571                         kfree(cp0);
2572                         head->write_buf = cp;
2573                         cp0 = cp;
2574                         head->writebuf_size = len;
2575                 }
2576                 if (get_user(c, buffer)) {
2577                         error = -EFAULT;
2578                         break;
2579                 }
2580                 buffer++;
2581                 avail_len--;
2582                 cp0[head->w.avail++] = c;
2583                 if (c != '\n')
2584                         continue;
2585                 cp0[head->w.avail - 1] = '\0';
2586                 head->w.avail = 0;
2587                 tomoyo_normalize_line(cp0);
2588                 if (!strcmp(cp0, "reset")) {
2589                         head->w.ns = &tomoyo_kernel_namespace;
2590                         head->w.domain = NULL;
2591                         memset(&head->r, 0, sizeof(head->r));
2592                         continue;
2593                 }
2594                 /* Don't allow updating policies by non manager programs. */
2595                 switch (head->type) {
2596                 case TOMOYO_PROCESS_STATUS:
2597                         /* This does not write anything. */
2598                         break;
2599                 case TOMOYO_DOMAINPOLICY:
2600                         if (tomoyo_select_domain(head, cp0))
2601                                 continue;
2602                         /* fall through */
2603                 case TOMOYO_EXCEPTIONPOLICY:
2604                         if (!strcmp(cp0, "select transition_only")) {
2605                                 head->r.print_transition_related_only = true;
2606                                 continue;
2607                         }
2608                         /* fall through */
2609                 default:
2610                         if (!tomoyo_manager()) {
2611                                 error = -EPERM;
2612                                 goto out;
2613                         }
2614                 }
2615                 switch (tomoyo_parse_policy(head, cp0)) {
2616                 case -EPERM:
2617                         error = -EPERM;
2618                         goto out;
2619                 case 0:
2620                         switch (head->type) {
2621                         case TOMOYO_DOMAINPOLICY:
2622                         case TOMOYO_EXCEPTIONPOLICY:
2623                         case TOMOYO_STAT:
2624                         case TOMOYO_PROFILE:
2625                         case TOMOYO_MANAGER:
2626                                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2627                                 break;
2628                         default:
2629                                 break;
2630                         }
2631                         break;
2632                 }
2633         }
2634 out:
2635         tomoyo_read_unlock(idx);
2636         mutex_unlock(&head->io_sem);
2637         return error;
2638 }
2639
2640 /**
2641  * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2642  *
2643  * @head: Pointer to "struct tomoyo_io_buffer".
2644  *
2645  * Returns 0.
2646  */
2647 int tomoyo_close_control(struct tomoyo_io_buffer *head)
2648 {
2649         /*
2650          * If the file is /sys/kernel/security/tomoyo/query , decrement the
2651          * observer counter.
2652          */
2653         if (head->type == TOMOYO_QUERY &&
2654             atomic_dec_and_test(&tomoyo_query_observers))
2655                 wake_up_all(&tomoyo_answer_wait);
2656         tomoyo_notify_gc(head, false);
2657         return 0;
2658 }
2659
2660 /**
2661  * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2662  */
2663 void tomoyo_check_profile(void)
2664 {
2665         struct tomoyo_domain_info *domain;
2666         const int idx = tomoyo_read_lock();
2667         tomoyo_policy_loaded = true;
2668         printk(KERN_INFO "TOMOYO: 2.4.0\n");
2669         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2670                 const u8 profile = domain->profile;
2671                 const struct tomoyo_policy_namespace *ns = domain->ns;
2672                 if (ns->profile_version != 20100903)
2673                         printk(KERN_ERR
2674                                "Profile version %u is not supported.\n",
2675                                ns->profile_version);
2676                 else if (!ns->profile_ptr[profile])
2677                         printk(KERN_ERR
2678                                "Profile %u (used by '%s') is not defined.\n",
2679                                profile, domain->domainname->name);
2680                 else
2681                         continue;
2682                 printk(KERN_ERR
2683                        "Userland tools for TOMOYO 2.4 must be installed and "
2684                        "policy must be initialized.\n");
2685                 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.4/ "
2686                        "for more information.\n");
2687                 panic("STOP!");
2688         }
2689         tomoyo_read_unlock(idx);
2690         printk(KERN_INFO "Mandatory Access Control activated.\n");
2691 }
2692
2693 /**
2694  * tomoyo_load_builtin_policy - Load built-in policy.
2695  *
2696  * Returns nothing.
2697  */
2698 void __init tomoyo_load_builtin_policy(void)
2699 {
2700         /*
2701          * This include file is manually created and contains built-in policy
2702          * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2703          * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2704          * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2705          */
2706 #include "builtin-policy.h"
2707         u8 i;
2708         const int idx = tomoyo_read_lock();
2709         for (i = 0; i < 5; i++) {
2710                 struct tomoyo_io_buffer head = { };
2711                 char *start = "";
2712                 switch (i) {
2713                 case 0:
2714                         start = tomoyo_builtin_profile;
2715                         head.type = TOMOYO_PROFILE;
2716                         head.write = tomoyo_write_profile;
2717                         break;
2718                 case 1:
2719                         start = tomoyo_builtin_exception_policy;
2720                         head.type = TOMOYO_EXCEPTIONPOLICY;
2721                         head.write = tomoyo_write_exception;
2722                         break;
2723                 case 2:
2724                         start = tomoyo_builtin_domain_policy;
2725                         head.type = TOMOYO_DOMAINPOLICY;
2726                         head.write = tomoyo_write_domain;
2727                         break;
2728                 case 3:
2729                         start = tomoyo_builtin_manager;
2730                         head.type = TOMOYO_MANAGER;
2731                         head.write = tomoyo_write_manager;
2732                         break;
2733                 case 4:
2734                         start = tomoyo_builtin_stat;
2735                         head.type = TOMOYO_STAT;
2736                         head.write = tomoyo_write_stat;
2737                         break;
2738                 }
2739                 while (1) {
2740                         char *end = strchr(start, '\n');
2741                         if (!end)
2742                                 break;
2743                         *end = '\0';
2744                         tomoyo_normalize_line(start);
2745                         head.write_buf = start;
2746                         tomoyo_parse_policy(&head, start);
2747                         start = end + 1;
2748                 }
2749         }
2750         tomoyo_read_unlock(idx);
2751 #ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2752         tomoyo_check_profile();
2753 #endif
2754 }