security/tomoyo/common.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * security/tomoyo/common.c
   4  *
   5  * Copyright (C) 2005-2011  NTT DATA CORPORATION
   6  */
   7
   8 #include <linux/uaccess.h>
   9 #include <linux/slab.h>
  10 #include <linux/security.h>
  11 #include "common.h"
  12
  13 /* String table for operation mode. */
  14 const char * const tomoyo_mode[TOMOYO_CONFIG_MAX_MODE] = {
  15         [TOMOYO_CONFIG_DISABLED]   = "disabled",
  16         [TOMOYO_CONFIG_LEARNING]   = "learning",
  17         [TOMOYO_CONFIG_PERMISSIVE] = "permissive",
  18         [TOMOYO_CONFIG_ENFORCING]  = "enforcing"
  19 };
  20
  21 /* String table for /sys/kernel/security/tomoyo/profile */
  22 const char * const tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
  23                                        + TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
  24         /* CONFIG::file group */
  25         [TOMOYO_MAC_FILE_EXECUTE]    = "execute",
  26         [TOMOYO_MAC_FILE_OPEN]       = "open",
  27         [TOMOYO_MAC_FILE_CREATE]     = "create",
  28         [TOMOYO_MAC_FILE_UNLINK]     = "unlink",
  29         [TOMOYO_MAC_FILE_GETATTR]    = "getattr",
  30         [TOMOYO_MAC_FILE_MKDIR]      = "mkdir",
  31         [TOMOYO_MAC_FILE_RMDIR]      = "rmdir",
  32         [TOMOYO_MAC_FILE_MKFIFO]     = "mkfifo",
  33         [TOMOYO_MAC_FILE_MKSOCK]     = "mksock",
  34         [TOMOYO_MAC_FILE_TRUNCATE]   = "truncate",
  35         [TOMOYO_MAC_FILE_SYMLINK]    = "symlink",
  36         [TOMOYO_MAC_FILE_MKBLOCK]    = "mkblock",
  37         [TOMOYO_MAC_FILE_MKCHAR]     = "mkchar",
  38         [TOMOYO_MAC_FILE_LINK]       = "link",
  39         [TOMOYO_MAC_FILE_RENAME]     = "rename",
  40         [TOMOYO_MAC_FILE_CHMOD]      = "chmod",
  41         [TOMOYO_MAC_FILE_CHOWN]      = "chown",
  42         [TOMOYO_MAC_FILE_CHGRP]      = "chgrp",
  43         [TOMOYO_MAC_FILE_IOCTL]      = "ioctl",
  44         [TOMOYO_MAC_FILE_CHROOT]     = "chroot",
  45         [TOMOYO_MAC_FILE_MOUNT]      = "mount",
  46         [TOMOYO_MAC_FILE_UMOUNT]     = "unmount",
  47         [TOMOYO_MAC_FILE_PIVOT_ROOT] = "pivot_root",
  48         /* CONFIG::network group */
  49         [TOMOYO_MAC_NETWORK_INET_STREAM_BIND]       = "inet_stream_bind",
  50         [TOMOYO_MAC_NETWORK_INET_STREAM_LISTEN]     = "inet_stream_listen",
  51         [TOMOYO_MAC_NETWORK_INET_STREAM_CONNECT]    = "inet_stream_connect",
  52         [TOMOYO_MAC_NETWORK_INET_DGRAM_BIND]        = "inet_dgram_bind",
  53         [TOMOYO_MAC_NETWORK_INET_DGRAM_SEND]        = "inet_dgram_send",
  54         [TOMOYO_MAC_NETWORK_INET_RAW_BIND]          = "inet_raw_bind",
  55         [TOMOYO_MAC_NETWORK_INET_RAW_SEND]          = "inet_raw_send",
  56         [TOMOYO_MAC_NETWORK_UNIX_STREAM_BIND]       = "unix_stream_bind",
  57         [TOMOYO_MAC_NETWORK_UNIX_STREAM_LISTEN]     = "unix_stream_listen",
  58         [TOMOYO_MAC_NETWORK_UNIX_STREAM_CONNECT]    = "unix_stream_connect",
  59         [TOMOYO_MAC_NETWORK_UNIX_DGRAM_BIND]        = "unix_dgram_bind",
  60         [TOMOYO_MAC_NETWORK_UNIX_DGRAM_SEND]        = "unix_dgram_send",
  61         [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_BIND]    = "unix_seqpacket_bind",
  62         [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_LISTEN]  = "unix_seqpacket_listen",
  63         [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_CONNECT] = "unix_seqpacket_connect",
  64         /* CONFIG::misc group */
  65         [TOMOYO_MAC_ENVIRON] = "env",
  66         /* CONFIG group */
  67         [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file",
  68         [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_NETWORK] = "network",
  69         [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_MISC] = "misc",
  70 };
  71
  72 /* String table for conditions. */
  73 const char * const tomoyo_condition_keyword[TOMOYO_MAX_CONDITION_KEYWORD] = {
  74         [TOMOYO_TASK_UID]             = "task.uid",
  75         [TOMOYO_TASK_EUID]            = "task.euid",
  76         [TOMOYO_TASK_SUID]            = "task.suid",
  77         [TOMOYO_TASK_FSUID]           = "task.fsuid",
  78         [TOMOYO_TASK_GID]             = "task.gid",
  79         [TOMOYO_TASK_EGID]            = "task.egid",
  80         [TOMOYO_TASK_SGID]            = "task.sgid",
  81         [TOMOYO_TASK_FSGID]           = "task.fsgid",
  82         [TOMOYO_TASK_PID]             = "task.pid",
  83         [TOMOYO_TASK_PPID]            = "task.ppid",
  84         [TOMOYO_EXEC_ARGC]            = "exec.argc",
  85         [TOMOYO_EXEC_ENVC]            = "exec.envc",
  86         [TOMOYO_TYPE_IS_SOCKET]       = "socket",
  87         [TOMOYO_TYPE_IS_SYMLINK]      = "symlink",
  88         [TOMOYO_TYPE_IS_FILE]         = "file",
  89         [TOMOYO_TYPE_IS_BLOCK_DEV]    = "block",
  90         [TOMOYO_TYPE_IS_DIRECTORY]    = "directory",
  91         [TOMOYO_TYPE_IS_CHAR_DEV]     = "char",
  92         [TOMOYO_TYPE_IS_FIFO]         = "fifo",
  93         [TOMOYO_MODE_SETUID]          = "setuid",
  94         [TOMOYO_MODE_SETGID]          = "setgid",
  95         [TOMOYO_MODE_STICKY]          = "sticky",
  96         [TOMOYO_MODE_OWNER_READ]      = "owner_read",
  97         [TOMOYO_MODE_OWNER_WRITE]     = "owner_write",
  98         [TOMOYO_MODE_OWNER_EXECUTE]   = "owner_execute",
  99         [TOMOYO_MODE_GROUP_READ]      = "group_read",
 100         [TOMOYO_MODE_GROUP_WRITE]     = "group_write",
 101         [TOMOYO_MODE_GROUP_EXECUTE]   = "group_execute",
 102         [TOMOYO_MODE_OTHERS_READ]     = "others_read",
 103         [TOMOYO_MODE_OTHERS_WRITE]    = "others_write",
 104         [TOMOYO_MODE_OTHERS_EXECUTE]  = "others_execute",
 105         [TOMOYO_EXEC_REALPATH]        = "exec.realpath",
 106         [TOMOYO_SYMLINK_TARGET]       = "symlink.target",
 107         [TOMOYO_PATH1_UID]            = "path1.uid",
 108         [TOMOYO_PATH1_GID]            = "path1.gid",
 109         [TOMOYO_PATH1_INO]            = "path1.ino",
 110         [TOMOYO_PATH1_MAJOR]          = "path1.major",
 111         [TOMOYO_PATH1_MINOR]          = "path1.minor",
 112         [TOMOYO_PATH1_PERM]           = "path1.perm",
 113         [TOMOYO_PATH1_TYPE]           = "path1.type",
 114         [TOMOYO_PATH1_DEV_MAJOR]      = "path1.dev_major",
 115         [TOMOYO_PATH1_DEV_MINOR]      = "path1.dev_minor",
 116         [TOMOYO_PATH2_UID]            = "path2.uid",
 117         [TOMOYO_PATH2_GID]            = "path2.gid",
 118         [TOMOYO_PATH2_INO]            = "path2.ino",
 119         [TOMOYO_PATH2_MAJOR]          = "path2.major",
 120         [TOMOYO_PATH2_MINOR]          = "path2.minor",
 121         [TOMOYO_PATH2_PERM]           = "path2.perm",
 122         [TOMOYO_PATH2_TYPE]           = "path2.type",
 123         [TOMOYO_PATH2_DEV_MAJOR]      = "path2.dev_major",
 124         [TOMOYO_PATH2_DEV_MINOR]      = "path2.dev_minor",
 125         [TOMOYO_PATH1_PARENT_UID]     = "path1.parent.uid",
 126         [TOMOYO_PATH1_PARENT_GID]     = "path1.parent.gid",
 127         [TOMOYO_PATH1_PARENT_INO]     = "path1.parent.ino",
 128         [TOMOYO_PATH1_PARENT_PERM]    = "path1.parent.perm",
 129         [TOMOYO_PATH2_PARENT_UID]     = "path2.parent.uid",
 130         [TOMOYO_PATH2_PARENT_GID]     = "path2.parent.gid",
 131         [TOMOYO_PATH2_PARENT_INO]     = "path2.parent.ino",
 132         [TOMOYO_PATH2_PARENT_PERM]    = "path2.parent.perm",
 133 };
 134
 135 /* String table for PREFERENCE keyword. */
 136 static const char * const tomoyo_pref_keywords[TOMOYO_MAX_PREF] = {
 137         [TOMOYO_PREF_MAX_AUDIT_LOG]      = "max_audit_log",
 138         [TOMOYO_PREF_MAX_LEARNING_ENTRY] = "max_learning_entry",
 139 };
 140
 141 /* String table for path operation. */
 142 const char * const tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = {
 143         [TOMOYO_TYPE_EXECUTE]    = "execute",
 144         [TOMOYO_TYPE_READ]       = "read",
 145         [TOMOYO_TYPE_WRITE]      = "write",
 146         [TOMOYO_TYPE_APPEND]     = "append",
 147         [TOMOYO_TYPE_UNLINK]     = "unlink",
 148         [TOMOYO_TYPE_GETATTR]    = "getattr",
 149         [TOMOYO_TYPE_RMDIR]      = "rmdir",
 150         [TOMOYO_TYPE_TRUNCATE]   = "truncate",
 151         [TOMOYO_TYPE_SYMLINK]    = "symlink",
 152         [TOMOYO_TYPE_CHROOT]     = "chroot",
 153         [TOMOYO_TYPE_UMOUNT]     = "unmount",
 154 };
 155
 156 /* String table for socket's operation. */
 157 const char * const tomoyo_socket_keyword[TOMOYO_MAX_NETWORK_OPERATION] = {
 158         [TOMOYO_NETWORK_BIND]    = "bind",
 159         [TOMOYO_NETWORK_LISTEN]  = "listen",
 160         [TOMOYO_NETWORK_CONNECT] = "connect",
 161         [TOMOYO_NETWORK_SEND]    = "send",
 162 };
 163
 164 /* String table for categories. */
 165 static const char * const tomoyo_category_keywords
 166 [TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
 167         [TOMOYO_MAC_CATEGORY_FILE]    = "file",
 168         [TOMOYO_MAC_CATEGORY_NETWORK] = "network",
 169         [TOMOYO_MAC_CATEGORY_MISC]    = "misc",
 170 };
 171
 172 /* Permit policy management by non-root user? */
 173 static bool tomoyo_manage_by_non_root;
 174
 175 /* Utility functions. */
 176
 177 /**
 178  * tomoyo_yesno - Return "yes" or "no".
 179  *
 180  * @value: Bool value.
 181  */
 182 const char *tomoyo_yesno(const unsigned int value)
 183 {
 184         return value ? "yes" : "no";
 185 }
 186
 187 /**
 188  * tomoyo_addprintf - strncat()-like-snprintf().
 189  *
 190  * @buffer: Buffer to write to. Must be '\0'-terminated.
 191  * @len:    Size of @buffer.
 192  * @fmt:    The printf()'s format string, followed by parameters.
 193  *
 194  * Returns nothing.
 195  */
 196 static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...)
 197 {
 198         va_list args;
 199         const int pos = strlen(buffer);
 200         va_start(args, fmt);
 201         vsnprintf(buffer + pos, len - pos - 1, fmt, args);
 202         va_end(args);
 203 }
 204
 205 /**
 206  * tomoyo_flush - Flush queued string to userspace's buffer.
 207  *
 208  * @head:   Pointer to "struct tomoyo_io_buffer".
 209  *
 210  * Returns true if all data was flushed, false otherwise.
 211  */
 212 static bool tomoyo_flush(struct tomoyo_io_buffer *head)
 213 {
 214         while (head->r.w_pos) {
 215                 const char *w = head->r.w[0];
 216                 size_t len = strlen(w);
 217                 if (len) {
 218                         if (len > head->read_user_buf_avail)
 219                                 len = head->read_user_buf_avail;
 220                         if (!len)
 221                                 return false;
 222                         if (copy_to_user(head->read_user_buf, w, len))
 223                                 return false;
 224                         head->read_user_buf_avail -= len;
 225                         head->read_user_buf += len;
 226                         w += len;
 227                 }
 228                 head->r.w[0] = w;
 229                 if (*w)
 230                         return false;
 231                 /* Add '\0' for audit logs and query. */
 232                 if (head->poll) {
 233                         if (!head->read_user_buf_avail ||
 234                             copy_to_user(head->read_user_buf, "", 1))
 235                                 return false;
 236                         head->read_user_buf_avail--;
 237                         head->read_user_buf++;
 238                 }
 239                 head->r.w_pos--;
 240                 for (len = 0; len < head->r.w_pos; len++)
 241                         head->r.w[len] = head->r.w[len + 1];
 242         }
 243         head->r.avail = 0;
 244         return true;
 245 }
 246
 247 /**
 248  * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
 249  *
 250  * @head:   Pointer to "struct tomoyo_io_buffer".
 251  * @string: String to print.
 252  *
 253  * Note that @string has to be kept valid until @head is kfree()d.
 254  * This means that char[] allocated on stack memory cannot be passed to
 255  * this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
 256  */
 257 static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string)
 258 {
 259         if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) {
 260                 head->r.w[head->r.w_pos++] = string;
 261                 tomoyo_flush(head);
 262         } else
 263                 WARN_ON(1);
 264 }
 265
 266 static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
 267                              ...) __printf(2, 3);
 268
 269 /**
 270  * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
 271  *
 272  * @head: Pointer to "struct tomoyo_io_buffer".
 273  * @fmt:  The printf()'s format string, followed by parameters.
 274  */
 275 static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
 276                              ...)
 277 {
 278         va_list args;
 279         size_t len;
 280         size_t pos = head->r.avail;
 281         int size = head->readbuf_size - pos;
 282         if (size <= 0)
 283                 return;
 284         va_start(args, fmt);
 285         len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
 286         va_end(args);
 287         if (pos + len >= head->readbuf_size) {
 288                 WARN_ON(1);
 289                 return;
 290         }
 291         head->r.avail += len;
 292         tomoyo_set_string(head, head->read_buf + pos);
 293 }
 294
 295 /**
 296  * tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure.
 297  *
 298  * @head: Pointer to "struct tomoyo_io_buffer".
 299  *
 300  * Returns nothing.
 301  */
 302 static void tomoyo_set_space(struct tomoyo_io_buffer *head)
 303 {
 304         tomoyo_set_string(head, " ");
 305 }
 306
 307 /**
 308  * tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure.
 309  *
 310  * @head: Pointer to "struct tomoyo_io_buffer".
 311  *
 312  * Returns nothing.
 313  */
 314 static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
 315 {
 316         tomoyo_set_string(head, "\n");
 317         return !head->r.w_pos;
 318 }
 319
 320 /**
 321  * tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure.
 322  *
 323  * @head: Pointer to "struct tomoyo_io_buffer".
 324  *
 325  * Returns nothing.
 326  */
 327 static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
 328 {
 329         tomoyo_set_string(head, "/");
 330 }
 331
 332 /* List of namespaces. */
 333 LIST_HEAD(tomoyo_namespace_list);
 334 /* True if namespace other than tomoyo_kernel_namespace is defined. */
 335 static bool tomoyo_namespace_enabled;
 336
 337 /**
 338  * tomoyo_init_policy_namespace - Initialize namespace.
 339  *
 340  * @ns: Pointer to "struct tomoyo_policy_namespace".
 341  *
 342  * Returns nothing.
 343  */
 344 void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns)
 345 {
 346         unsigned int idx;
 347         for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++)
 348                 INIT_LIST_HEAD(&ns->acl_group[idx]);
 349         for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++)
 350                 INIT_LIST_HEAD(&ns->group_list[idx]);
 351         for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++)
 352                 INIT_LIST_HEAD(&ns->policy_list[idx]);
 353         ns->profile_version = 20110903;
 354         tomoyo_namespace_enabled = !list_empty(&tomoyo_namespace_list);
 355         list_add_tail_rcu(&ns->namespace_list, &tomoyo_namespace_list);
 356 }
 357
 358 /**
 359  * tomoyo_print_namespace - Print namespace header.
 360  *
 361  * @head: Pointer to "struct tomoyo_io_buffer".
 362  *
 363  * Returns nothing.
 364  */
 365 static void tomoyo_print_namespace(struct tomoyo_io_buffer *head)
 366 {
 367         if (!tomoyo_namespace_enabled)
 368                 return;
 369         tomoyo_set_string(head,
 370                           container_of(head->r.ns,
 371                                        struct tomoyo_policy_namespace,
 372                                        namespace_list)->name);
 373         tomoyo_set_space(head);
 374 }
 375
 376 /**
 377  * tomoyo_print_name_union - Print a tomoyo_name_union.
 378  *
 379  * @head: Pointer to "struct tomoyo_io_buffer".
 380  * @ptr:  Pointer to "struct tomoyo_name_union".
 381  */
 382 static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
 383                                     const struct tomoyo_name_union *ptr)
 384 {
 385         tomoyo_set_space(head);
 386         if (ptr->group) {
 387                 tomoyo_set_string(head, "@");
 388                 tomoyo_set_string(head, ptr->group->group_name->name);
 389         } else {
 390                 tomoyo_set_string(head, ptr->filename->name);
 391         }
 392 }
 393
 394 /**
 395  * tomoyo_print_name_union_quoted - Print a tomoyo_name_union with a quote.
 396  *
 397  * @head: Pointer to "struct tomoyo_io_buffer".
 398  * @ptr:  Pointer to "struct tomoyo_name_union".
 399  *
 400  * Returns nothing.
 401  */
 402 static void tomoyo_print_name_union_quoted(struct tomoyo_io_buffer *head,
 403                                            const struct tomoyo_name_union *ptr)
 404 {
 405         if (ptr->group) {
 406                 tomoyo_set_string(head, "@");
 407                 tomoyo_set_string(head, ptr->group->group_name->name);
 408         } else {
 409                 tomoyo_set_string(head, "\"");
 410                 tomoyo_set_string(head, ptr->filename->name);
 411                 tomoyo_set_string(head, "\"");
 412         }
 413 }
 414
 415 /**
 416  * tomoyo_print_number_union_nospace - Print a tomoyo_number_union without a space.
 417  *
 418  * @head: Pointer to "struct tomoyo_io_buffer".
 419  * @ptr:  Pointer to "struct tomoyo_number_union".
 420  *
 421  * Returns nothing.
 422  */
 423 static void tomoyo_print_number_union_nospace
 424 (struct tomoyo_io_buffer *head, const struct tomoyo_number_union *ptr)
 425 {
 426         if (ptr->group) {
 427                 tomoyo_set_string(head, "@");
 428                 tomoyo_set_string(head, ptr->group->group_name->name);
 429         } else {
 430                 int i;
 431                 unsigned long min = ptr->values[0];
 432                 const unsigned long max = ptr->values[1];
 433                 u8 min_type = ptr->value_type[0];
 434                 const u8 max_type = ptr->value_type[1];
 435                 char buffer[128];
 436                 buffer[0] = '\0';
 437                 for (i = 0; i < 2; i++) {
 438                         switch (min_type) {
 439                         case TOMOYO_VALUE_TYPE_HEXADECIMAL:
 440                                 tomoyo_addprintf(buffer, sizeof(buffer),
 441                                                  "0x%lX", min);
 442                                 break;
 443                         case TOMOYO_VALUE_TYPE_OCTAL:
 444                                 tomoyo_addprintf(buffer, sizeof(buffer),
 445                                                  "0%lo", min);
 446                                 break;
 447                         default:
 448                                 tomoyo_addprintf(buffer, sizeof(buffer), "%lu",
 449                                                  min);
 450                                 break;
 451                         }
 452                         if (min == max && min_type == max_type)
 453                                 break;
 454                         tomoyo_addprintf(buffer, sizeof(buffer), "-");
 455                         min_type = max_type;
 456                         min = max;
 457                 }
 458                 tomoyo_io_printf(head, "%s", buffer);
 459         }
 460 }
 461
 462 /**
 463  * tomoyo_print_number_union - Print a tomoyo_number_union.
 464  *
 465  * @head: Pointer to "struct tomoyo_io_buffer".
 466  * @ptr:  Pointer to "struct tomoyo_number_union".
 467  *
 468  * Returns nothing.
 469  */
 470 static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
 471                                       const struct tomoyo_number_union *ptr)
 472 {
 473         tomoyo_set_space(head);
 474         tomoyo_print_number_union_nospace(head, ptr);
 475 }
 476
 477 /**
 478  * tomoyo_assign_profile - Create a new profile.
 479  *
 480  * @ns:      Pointer to "struct tomoyo_policy_namespace".
 481  * @profile: Profile number to create.
 482  *
 483  * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
 484  */
 485 static struct tomoyo_profile *tomoyo_assign_profile
 486 (struct tomoyo_policy_namespace *ns, const unsigned int profile)
 487 {
 488         struct tomoyo_profile *ptr;
 489         struct tomoyo_profile *entry;
 490         if (profile >= TOMOYO_MAX_PROFILES)
 491                 return NULL;
 492         ptr = ns->profile_ptr[profile];
 493         if (ptr)
 494                 return ptr;
 495         entry = kzalloc(sizeof(*entry), GFP_NOFS);
 496         if (mutex_lock_interruptible(&tomoyo_policy_lock))
 497                 goto out;
 498         ptr = ns->profile_ptr[profile];
 499         if (!ptr && tomoyo_memory_ok(entry)) {
 500                 ptr = entry;
 501                 ptr->default_config = TOMOYO_CONFIG_DISABLED |
 502                         TOMOYO_CONFIG_WANT_GRANT_LOG |
 503                         TOMOYO_CONFIG_WANT_REJECT_LOG;
 504                 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
 505                        sizeof(ptr->config));
 506                 ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] =
 507                         CONFIG_SECURITY_TOMOYO_MAX_AUDIT_LOG;
 508                 ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] =
 509                         CONFIG_SECURITY_TOMOYO_MAX_ACCEPT_ENTRY;
 510                 mb(); /* Avoid out-of-order execution. */
 511                 ns->profile_ptr[profile] = ptr;
 512                 entry = NULL;
 513         }
 514         mutex_unlock(&tomoyo_policy_lock);
 515  out:
 516         kfree(entry);
 517         return ptr;
 518 }
 519
 520 /**
 521  * tomoyo_profile - Find a profile.
 522  *
 523  * @ns:      Pointer to "struct tomoyo_policy_namespace".
 524  * @profile: Profile number to find.
 525  *
 526  * Returns pointer to "struct tomoyo_profile".
 527  */
 528 struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns,
 529                                       const u8 profile)
 530 {
 531         static struct tomoyo_profile tomoyo_null_profile;
 532         struct tomoyo_profile *ptr = ns->profile_ptr[profile];
 533         if (!ptr)
 534                 ptr = &tomoyo_null_profile;
 535         return ptr;
 536 }
 537
 538 /**
 539  * tomoyo_find_yesno - Find values for specified keyword.
 540  *
 541  * @string: String to check.
 542  * @find:   Name of keyword.
 543  *
 544  * Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise.
 545  */
 546 static s8 tomoyo_find_yesno(const char *string, const char *find)
 547 {
 548         const char *cp = strstr(string, find);
 549         if (cp) {
 550                 cp += strlen(find);
 551                 if (!strncmp(cp, "=yes", 4))
 552                         return 1;
 553                 else if (!strncmp(cp, "=no", 3))
 554                         return 0;
 555         }
 556         return -1;
 557 }
 558
 559 /**
 560  * tomoyo_set_uint - Set value for specified preference.
 561  *
 562  * @i:      Pointer to "unsigned int".
 563  * @string: String to check.
 564  * @find:   Name of keyword.
 565  *
 566  * Returns nothing.
 567  */
 568 static void tomoyo_set_uint(unsigned int *i, const char *string,
 569                             const char *find)
 570 {
 571         const char *cp = strstr(string, find);
 572         if (cp)
 573                 sscanf(cp + strlen(find), "=%u", i);
 574 }
 575
 576 /**
 577  * tomoyo_set_mode - Set mode for specified profile.
 578  *
 579  * @name:    Name of functionality.
 580  * @value:   Mode for @name.
 581  * @profile: Pointer to "struct tomoyo_profile".
 582  *
 583  * Returns 0 on success, negative value otherwise.
 584  */
 585 static int tomoyo_set_mode(char *name, const char *value,
 586                            struct tomoyo_profile *profile)
 587 {
 588         u8 i;
 589         u8 config;
 590         if (!strcmp(name, "CONFIG")) {
 591                 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
 592                 config = profile->default_config;
 593         } else if (tomoyo_str_starts(&name, "CONFIG::")) {
 594                 config = 0;
 595                 for (i = 0; i < TOMOYO_MAX_MAC_INDEX
 596                              + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
 597                         int len = 0;
 598                         if (i < TOMOYO_MAX_MAC_INDEX) {
 599                                 const u8 c = tomoyo_index2category[i];
 600                                 const char *category =
 601                                         tomoyo_category_keywords[c];
 602                                 len = strlen(category);
 603                                 if (strncmp(name, category, len) ||
 604                                     name[len++] != ':' || name[len++] != ':')
 605                                         continue;
 606                         }
 607                         if (strcmp(name + len, tomoyo_mac_keywords[i]))
 608                                 continue;
 609                         config = profile->config[i];
 610                         break;
 611                 }
 612                 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
 613                         return -EINVAL;
 614         } else {
 615                 return -EINVAL;
 616         }
 617         if (strstr(value, "use_default")) {
 618                 config = TOMOYO_CONFIG_USE_DEFAULT;
 619         } else {
 620                 u8 mode;
 621                 for (mode = 0; mode < 4; mode++)
 622                         if (strstr(value, tomoyo_mode[mode]))
 623                                 /*
 624                                  * Update lower 3 bits in order to distinguish
 625                                  * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
 626                                  */
 627                                 config = (config & ~7) | mode;
 628                 if (config != TOMOYO_CONFIG_USE_DEFAULT) {
 629                         switch (tomoyo_find_yesno(value, "grant_log")) {
 630                         case 1:
 631                                 config |= TOMOYO_CONFIG_WANT_GRANT_LOG;
 632                                 break;
 633                         case 0:
 634                                 config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG;
 635                                 break;
 636                         }
 637                         switch (tomoyo_find_yesno(value, "reject_log")) {
 638                         case 1:
 639                                 config |= TOMOYO_CONFIG_WANT_REJECT_LOG;
 640                                 break;
 641                         case 0:
 642                                 config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG;
 643                                 break;
 644                         }
 645                 }
 646         }
 647         if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
 648                 profile->config[i] = config;
 649         else if (config != TOMOYO_CONFIG_USE_DEFAULT)
 650                 profile->default_config = config;
 651         return 0;
 652 }
 653
 654 /**
 655  * tomoyo_write_profile - Write profile table.
 656  *
 657  * @head: Pointer to "struct tomoyo_io_buffer".
 658  *
 659  * Returns 0 on success, negative value otherwise.
 660  */
 661 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
 662 {
 663         char *data = head->write_buf;
 664         unsigned int i;
 665         char *cp;
 666         struct tomoyo_profile *profile;
 667         if (sscanf(data, "PROFILE_VERSION=%u", &head->w.ns->profile_version)
 668             == 1)
 669                 return 0;
 670         i = simple_strtoul(data, &cp, 10);
 671         if (*cp != '-')
 672                 return -EINVAL;
 673         data = cp + 1;
 674         profile = tomoyo_assign_profile(head->w.ns, i);
 675         if (!profile)
 676                 return -EINVAL;
 677         cp = strchr(data, '=');
 678         if (!cp)
 679                 return -EINVAL;
 680         *cp++ = '\0';
 681         if (!strcmp(data, "COMMENT")) {
 682                 static DEFINE_SPINLOCK(lock);
 683                 const struct tomoyo_path_info *new_comment
 684                         = tomoyo_get_name(cp);
 685                 const struct tomoyo_path_info *old_comment;
 686                 if (!new_comment)
 687                         return -ENOMEM;
 688                 spin_lock(&lock);
 689                 old_comment = profile->comment;
 690                 profile->comment = new_comment;
 691                 spin_unlock(&lock);
 692                 tomoyo_put_name(old_comment);
 693                 return 0;
 694         }
 695         if (!strcmp(data, "PREFERENCE")) {
 696                 for (i = 0; i < TOMOYO_MAX_PREF; i++)
 697                         tomoyo_set_uint(&profile->pref[i], cp,
 698                                         tomoyo_pref_keywords[i]);
 699                 return 0;
 700         }
 701         return tomoyo_set_mode(data, cp, profile);
 702 }
 703
 704 /**
 705  * tomoyo_print_config - Print mode for specified functionality.
 706  *
 707  * @head:   Pointer to "struct tomoyo_io_buffer".
 708  * @config: Mode for that functionality.
 709  *
 710  * Returns nothing.
 711  *
 712  * Caller prints functionality's name.
 713  */
 714 static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
 715 {
 716         tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n",
 717                          tomoyo_mode[config & 3],
 718                          tomoyo_yesno(config & TOMOYO_CONFIG_WANT_GRANT_LOG),
 719                          tomoyo_yesno(config & TOMOYO_CONFIG_WANT_REJECT_LOG));
 720 }
 721
 722 /**
 723  * tomoyo_read_profile - Read profile table.
 724  *
 725  * @head: Pointer to "struct tomoyo_io_buffer".
 726  *
 727  * Returns nothing.
 728  */
 729 static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
 730 {
 731         u8 index;
 732         struct tomoyo_policy_namespace *ns =
 733                 container_of(head->r.ns, typeof(*ns), namespace_list);
 734         const struct tomoyo_profile *profile;
 735         if (head->r.eof)
 736                 return;
 737  next:
 738         index = head->r.index;
 739         profile = ns->profile_ptr[index];
 740         switch (head->r.step) {
 741         case 0:
 742                 tomoyo_print_namespace(head);
 743                 tomoyo_io_printf(head, "PROFILE_VERSION=%u\n",
 744                                  ns->profile_version);
 745                 head->r.step++;
 746                 break;
 747         case 1:
 748                 for ( ; head->r.index < TOMOYO_MAX_PROFILES;
 749                       head->r.index++)
 750                         if (ns->profile_ptr[head->r.index])
 751                                 break;
 752                 if (head->r.index == TOMOYO_MAX_PROFILES) {
 753                         head->r.eof = true;
 754                         return;
 755                 }
 756                 head->r.step++;
 757                 break;
 758         case 2:
 759                 {
 760                         u8 i;
 761                         const struct tomoyo_path_info *comment =
 762                                 profile->comment;
 763                         tomoyo_print_namespace(head);
 764                         tomoyo_io_printf(head, "%u-COMMENT=", index);
 765                         tomoyo_set_string(head, comment ? comment->name : "");
 766                         tomoyo_set_lf(head);
 767                         tomoyo_print_namespace(head);
 768                         tomoyo_io_printf(head, "%u-PREFERENCE={ ", index);
 769                         for (i = 0; i < TOMOYO_MAX_PREF; i++)
 770                                 tomoyo_io_printf(head, "%s=%u ",
 771                                                  tomoyo_pref_keywords[i],
 772                                                  profile->pref[i]);
 773                         tomoyo_set_string(head, "}\n");
 774                         head->r.step++;
 775                 }
 776                 break;
 777         case 3:
 778                 {
 779                         tomoyo_print_namespace(head);
 780                         tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
 781                         tomoyo_print_config(head, profile->default_config);
 782                         head->r.bit = 0;
 783                         head->r.step++;
 784                 }
 785                 break;
 786         case 4:
 787                 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
 788                               + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
 789                         const u8 i = head->r.bit;
 790                         const u8 config = profile->config[i];
 791                         if (config == TOMOYO_CONFIG_USE_DEFAULT)
 792                                 continue;
 793                         tomoyo_print_namespace(head);
 794                         if (i < TOMOYO_MAX_MAC_INDEX)
 795                                 tomoyo_io_printf(head, "%u-CONFIG::%s::%s",
 796                                                  index,
 797                                                  tomoyo_category_keywords
 798                                                  [tomoyo_index2category[i]],
 799                                                  tomoyo_mac_keywords[i]);
 800                         else
 801                                 tomoyo_io_printf(head, "%u-CONFIG::%s", index,
 802                                                  tomoyo_mac_keywords[i]);
 803                         tomoyo_print_config(head, config);
 804                         head->r.bit++;
 805                         break;
 806                 }
 807                 if (head->r.bit == TOMOYO_MAX_MAC_INDEX
 808                     + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
 809                         head->r.index++;
 810                         head->r.step = 1;
 811                 }
 812                 break;
 813         }
 814         if (tomoyo_flush(head))
 815                 goto next;
 816 }
 817
 818 /**
 819  * tomoyo_same_manager - Check for duplicated "struct tomoyo_manager" entry.
 820  *
 821  * @a: Pointer to "struct tomoyo_acl_head".
 822  * @b: Pointer to "struct tomoyo_acl_head".
 823  *
 824  * Returns true if @a == @b, false otherwise.
 825  */
 826 static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
 827                                 const struct tomoyo_acl_head *b)
 828 {
 829         return container_of(a, struct tomoyo_manager, head)->manager ==
 830                 container_of(b, struct tomoyo_manager, head)->manager;
 831 }
 832
 833 /**
 834  * tomoyo_update_manager_entry - Add a manager entry.
 835  *
 836  * @manager:   The path to manager or the domainnamme.
 837  * @is_delete: True if it is a delete request.
 838  *
 839  * Returns 0 on success, negative value otherwise.
 840  *
 841  * Caller holds tomoyo_read_lock().
 842  */
 843 static int tomoyo_update_manager_entry(const char *manager,
 844                                        const bool is_delete)
 845 {
 846         struct tomoyo_manager e = { };
 847         struct tomoyo_acl_param param = {
 848                 /* .ns = &tomoyo_kernel_namespace, */
 849                 .is_delete = is_delete,
 850                 .list = &tomoyo_kernel_namespace.
 851                 policy_list[TOMOYO_ID_MANAGER],
 852         };
 853         int error = is_delete ? -ENOENT : -ENOMEM;
 854         if (!tomoyo_correct_domain(manager) &&
 855             !tomoyo_correct_word(manager))
 856                 return -EINVAL;
 857         e.manager = tomoyo_get_name(manager);
 858         if (e.manager) {
 859                 error = tomoyo_update_policy(&e.head, sizeof(e), &param,
 860                                              tomoyo_same_manager);
 861                 tomoyo_put_name(e.manager);
 862         }
 863         return error;
 864 }
 865
 866 /**
 867  * tomoyo_write_manager - Write manager policy.
 868  *
 869  * @head: Pointer to "struct tomoyo_io_buffer".
 870  *
 871  * Returns 0 on success, negative value otherwise.
 872  *
 873  * Caller holds tomoyo_read_lock().
 874  */
 875 static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
 876 {
 877         char *data = head->write_buf;
 878
 879         if (!strcmp(data, "manage_by_non_root")) {
 880                 tomoyo_manage_by_non_root = !head->w.is_delete;
 881                 return 0;
 882         }
 883         return tomoyo_update_manager_entry(data, head->w.is_delete);
 884 }
 885
 886 /**
 887  * tomoyo_read_manager - Read manager policy.
 888  *
 889  * @head: Pointer to "struct tomoyo_io_buffer".
 890  *
 891  * Caller holds tomoyo_read_lock().
 892  */
 893 static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
 894 {
 895         if (head->r.eof)
 896                 return;
 897         list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.
 898                              policy_list[TOMOYO_ID_MANAGER]) {
 899                 struct tomoyo_manager *ptr =
 900                         list_entry(head->r.acl, typeof(*ptr), head.list);
 901                 if (ptr->head.is_deleted)
 902                         continue;
 903                 if (!tomoyo_flush(head))
 904                         return;
 905                 tomoyo_set_string(head, ptr->manager->name);
 906                 tomoyo_set_lf(head);
 907         }
 908         head->r.eof = true;
 909 }
 910
 911 /**
 912  * tomoyo_manager - Check whether the current process is a policy manager.
 913  *
 914  * Returns true if the current process is permitted to modify policy
 915  * via /sys/kernel/security/tomoyo/ interface.
 916  *
 917  * Caller holds tomoyo_read_lock().
 918  */
 919 static bool tomoyo_manager(void)
 920 {
 921         struct tomoyo_manager *ptr;
 922         const char *exe;
 923         const struct task_struct *task = current;
 924         const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
 925         bool found = false;
 926
 927         if (!tomoyo_policy_loaded)
 928                 return true;
 929         if (!tomoyo_manage_by_non_root &&
 930             (!uid_eq(task->cred->uid,  GLOBAL_ROOT_UID) ||
 931              !uid_eq(task->cred->euid, GLOBAL_ROOT_UID)))
 932                 return false;
 933         exe = tomoyo_get_exe();
 934         if (!exe)
 935                 return false;
 936         list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
 937                                 policy_list[TOMOYO_ID_MANAGER], head.list) {
 938                 if (!ptr->head.is_deleted &&
 939                     (!tomoyo_pathcmp(domainname, ptr->manager) ||
 940                      !strcmp(exe, ptr->manager->name))) {
 941                         found = true;
 942                         break;
 943                 }
 944         }
 945         if (!found) { /* Reduce error messages. */
 946                 static pid_t last_pid;
 947                 const pid_t pid = current->pid;
 948                 if (last_pid != pid) {
 949                         printk(KERN_WARNING "%s ( %s ) is not permitted to "
 950                                "update policies.\n", domainname->name, exe);
 951                         last_pid = pid;
 952                 }
 953         }
 954         kfree(exe);
 955         return found;
 956 }
 957
 958 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
 959 (unsigned int serial);
 960
 961 /**
 962  * tomoyo_select_domain - Parse select command.
 963  *
 964  * @head: Pointer to "struct tomoyo_io_buffer".
 965  * @data: String to parse.
 966  *
 967  * Returns true on success, false otherwise.
 968  *
 969  * Caller holds tomoyo_read_lock().
 970  */
 971 static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
 972                                  const char *data)
 973 {
 974         unsigned int pid;
 975         struct tomoyo_domain_info *domain = NULL;
 976         bool global_pid = false;
 977         if (strncmp(data, "select ", 7))
 978                 return false;
 979         data += 7;
 980         if (sscanf(data, "pid=%u", &pid) == 1 ||
 981             (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
 982                 struct task_struct *p;
 983                 rcu_read_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                 rcu_read_unlock();
 991         } else if (!strncmp(data, "domain=", 7)) {
 992                 if (tomoyo_domain_def(data + 7))
 993                         domain = tomoyo_find_domain(data + 7);
 994         } else if (sscanf(data, "Q=%u", &pid) == 1) {
 995                 domain = tomoyo_find_domain_by_qid(pid);
 996         } else
 997                 return false;
 998         head->w.domain = domain;
 999         /* Accessing read_buf is safe because head->io_sem is held. */
1000         if (!head->read_buf)
1001                 return true; /* Do nothing if open(O_WRONLY). */
1002         memset(&head->r, 0, sizeof(head->r));
1003         head->r.print_this_domain_only = true;
1004         if (domain)
1005                 head->r.domain = &domain->list;
1006         else
1007                 head->r.eof = 1;
1008         tomoyo_io_printf(head, "# select %s\n", data);
1009         if (domain && domain->is_deleted)
1010                 tomoyo_io_printf(head, "# This is a deleted domain.\n");
1011         return true;
1012 }
1013
1014 /**
1015  * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry.
1016  *
1017  * @a: Pointer to "struct tomoyo_acl_info".
1018  * @b: Pointer to "struct tomoyo_acl_info".
1019  *
1020  * Returns true if @a == @b, false otherwise.
1021  */
1022 static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a,
1023                               const struct tomoyo_acl_info *b)
1024 {
1025         const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head);
1026         const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head);
1027         return p1->domainname == p2->domainname;
1028 }
1029
1030 /**
1031  * tomoyo_write_task - Update task related list.
1032  *
1033  * @param: Pointer to "struct tomoyo_acl_param".
1034  *
1035  * Returns 0 on success, negative value otherwise.
1036  *
1037  * Caller holds tomoyo_read_lock().
1038  */
1039 static int tomoyo_write_task(struct tomoyo_acl_param *param)
1040 {
1041         int error = -EINVAL;
1042         if (tomoyo_str_starts(&param->data, "manual_domain_transition ")) {
1043                 struct tomoyo_task_acl e = {
1044                         .head.type = TOMOYO_TYPE_MANUAL_TASK_ACL,
1045                         .domainname = tomoyo_get_domainname(param),
1046                 };
1047                 if (e.domainname)
1048                         error = tomoyo_update_domain(&e.head, sizeof(e), param,
1049                                                      tomoyo_same_task_acl,
1050                                                      NULL);
1051                 tomoyo_put_name(e.domainname);
1052         }
1053         return error;
1054 }
1055
1056 /**
1057  * tomoyo_delete_domain - Delete a domain.
1058  *
1059  * @domainname: The name of domain.
1060  *
1061  * Returns 0 on success, negative value otherwise.
1062  *
1063  * Caller holds tomoyo_read_lock().
1064  */
1065 static int tomoyo_delete_domain(char *domainname)
1066 {
1067         struct tomoyo_domain_info *domain;
1068         struct tomoyo_path_info name;
1069
1070         name.name = domainname;
1071         tomoyo_fill_path_info(&name);
1072         if (mutex_lock_interruptible(&tomoyo_policy_lock))
1073                 return -EINTR;
1074         /* Is there an active domain? */
1075         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1076                 /* Never delete tomoyo_kernel_domain */
1077                 if (domain == &tomoyo_kernel_domain)
1078                         continue;
1079                 if (domain->is_deleted ||
1080                     tomoyo_pathcmp(domain->domainname, &name))
1081                         continue;
1082                 domain->is_deleted = true;
1083                 break;
1084         }
1085         mutex_unlock(&tomoyo_policy_lock);
1086         return 0;
1087 }
1088
1089 /**
1090  * tomoyo_write_domain2 - Write domain policy.
1091  *
1092  * @ns:        Pointer to "struct tomoyo_policy_namespace".
1093  * @list:      Pointer to "struct list_head".
1094  * @data:      Policy to be interpreted.
1095  * @is_delete: True if it is a delete request.
1096  *
1097  * Returns 0 on success, negative value otherwise.
1098  *
1099  * Caller holds tomoyo_read_lock().
1100  */
1101 static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
1102                                 struct list_head *list, char *data,
1103                                 const bool is_delete)
1104 {
1105         struct tomoyo_acl_param param = {
1106                 .ns = ns,
1107                 .list = list,
1108                 .data = data,
1109                 .is_delete = is_delete,
1110         };
1111         static const struct {
1112                 const char *keyword;
1113                 int (*write) (struct tomoyo_acl_param *);
1114         } tomoyo_callback[5] = {
1115                 { "file ", tomoyo_write_file },
1116                 { "network inet ", tomoyo_write_inet_network },
1117                 { "network unix ", tomoyo_write_unix_network },
1118                 { "misc ", tomoyo_write_misc },
1119                 { "task ", tomoyo_write_task },
1120         };
1121         u8 i;
1122
1123         for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) {
1124                 if (!tomoyo_str_starts(&param.data,
1125                                        tomoyo_callback[i].keyword))
1126                         continue;
1127                 return tomoyo_callback[i].write(&param);
1128         }
1129         return -EINVAL;
1130 }
1131
1132 /* String table for domain flags. */
1133 const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1134         [TOMOYO_DIF_QUOTA_WARNED]      = "quota_exceeded\n",
1135         [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1136 };
1137
1138 /**
1139  * tomoyo_write_domain - Write domain policy.
1140  *
1141  * @head: Pointer to "struct tomoyo_io_buffer".
1142  *
1143  * Returns 0 on success, negative value otherwise.
1144  *
1145  * Caller holds tomoyo_read_lock().
1146  */
1147 static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1148 {
1149         char *data = head->write_buf;
1150         struct tomoyo_policy_namespace *ns;
1151         struct tomoyo_domain_info *domain = head->w.domain;
1152         const bool is_delete = head->w.is_delete;
1153         bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1154         unsigned int profile;
1155         if (*data == '<') {
1156                 int ret = 0;
1157                 domain = NULL;
1158                 if (is_delete)
1159                         ret = tomoyo_delete_domain(data);
1160                 else if (is_select)
1161                         domain = tomoyo_find_domain(data);
1162                 else
1163                         domain = tomoyo_assign_domain(data, false);
1164                 head->w.domain = domain;
1165                 return ret;
1166         }
1167         if (!domain)
1168                 return -EINVAL;
1169         ns = domain->ns;
1170         if (sscanf(data, "use_profile %u", &profile) == 1
1171             && profile < TOMOYO_MAX_PROFILES) {
1172                 if (!tomoyo_policy_loaded || ns->profile_ptr[profile])
1173                         domain->profile = (u8) profile;
1174                 return 0;
1175         }
1176         if (sscanf(data, "use_group %u\n", &profile) == 1
1177             && profile < TOMOYO_MAX_ACL_GROUPS) {
1178                 if (!is_delete)
1179                         domain->group = (u8) profile;
1180                 return 0;
1181         }
1182         for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) {
1183                 const char *cp = tomoyo_dif[profile];
1184                 if (strncmp(data, cp, strlen(cp) - 1))
1185                         continue;
1186                 domain->flags[profile] = !is_delete;
1187                 return 0;
1188         }
1189         return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1190                                     is_delete);
1191 }
1192
1193 /**
1194  * tomoyo_print_condition - Print condition part.
1195  *
1196  * @head: Pointer to "struct tomoyo_io_buffer".
1197  * @cond: Pointer to "struct tomoyo_condition".
1198  *
1199  * Returns true on success, false otherwise.
1200  */
1201 static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1202                                    const struct tomoyo_condition *cond)
1203 {
1204         switch (head->r.cond_step) {
1205         case 0:
1206                 head->r.cond_index = 0;
1207                 head->r.cond_step++;
1208                 if (cond->transit) {
1209                         tomoyo_set_space(head);
1210                         tomoyo_set_string(head, cond->transit->name);
1211                 }
1212                 /* fall through */
1213         case 1:
1214                 {
1215                         const u16 condc = cond->condc;
1216                         const struct tomoyo_condition_element *condp =
1217                                 (typeof(condp)) (cond + 1);
1218                         const struct tomoyo_number_union *numbers_p =
1219                                 (typeof(numbers_p)) (condp + condc);
1220                         const struct tomoyo_name_union *names_p =
1221                                 (typeof(names_p))
1222                                 (numbers_p + cond->numbers_count);
1223                         const struct tomoyo_argv *argv =
1224                                 (typeof(argv)) (names_p + cond->names_count);
1225                         const struct tomoyo_envp *envp =
1226                                 (typeof(envp)) (argv + cond->argc);
1227                         u16 skip;
1228                         for (skip = 0; skip < head->r.cond_index; skip++) {
1229                                 const u8 left = condp->left;
1230                                 const u8 right = condp->right;
1231                                 condp++;
1232                                 switch (left) {
1233                                 case TOMOYO_ARGV_ENTRY:
1234                                         argv++;
1235                                         continue;
1236                                 case TOMOYO_ENVP_ENTRY:
1237                                         envp++;
1238                                         continue;
1239                                 case TOMOYO_NUMBER_UNION:
1240                                         numbers_p++;
1241                                         break;
1242                                 }
1243                                 switch (right) {
1244                                 case TOMOYO_NAME_UNION:
1245                                         names_p++;
1246                                         break;
1247                                 case TOMOYO_NUMBER_UNION:
1248                                         numbers_p++;
1249                                         break;
1250                                 }
1251                         }
1252                         while (head->r.cond_index < condc) {
1253                                 const u8 match = condp->equals;
1254                                 const u8 left = condp->left;
1255                                 const u8 right = condp->right;
1256                                 if (!tomoyo_flush(head))
1257                                         return false;
1258                                 condp++;
1259                                 head->r.cond_index++;
1260                                 tomoyo_set_space(head);
1261                                 switch (left) {
1262                                 case TOMOYO_ARGV_ENTRY:
1263                                         tomoyo_io_printf(head,
1264                                                          "exec.argv[%lu]%s=\"",
1265                                                          argv->index, argv->
1266                                                          is_not ? "!" : "");
1267                                         tomoyo_set_string(head,
1268                                                           argv->value->name);
1269                                         tomoyo_set_string(head, "\"");
1270                                         argv++;
1271                                         continue;
1272                                 case TOMOYO_ENVP_ENTRY:
1273                                         tomoyo_set_string(head,
1274                                                           "exec.envp[\"");
1275                                         tomoyo_set_string(head,
1276                                                           envp->name->name);
1277                                         tomoyo_io_printf(head, "\"]%s=", envp->
1278                                                          is_not ? "!" : "");
1279                                         if (envp->value) {
1280                                                 tomoyo_set_string(head, "\"");
1281                                                 tomoyo_set_string(head, envp->
1282                                                                   value->name);
1283                                                 tomoyo_set_string(head, "\"");
1284                                         } else {
1285                                                 tomoyo_set_string(head,
1286                                                                   "NULL");
1287                                         }
1288                                         envp++;
1289                                         continue;
1290                                 case TOMOYO_NUMBER_UNION:
1291                                         tomoyo_print_number_union_nospace
1292                                                 (head, numbers_p++);
1293                                         break;
1294                                 default:
1295                                         tomoyo_set_string(head,
1296                                                tomoyo_condition_keyword[left]);
1297                                         break;
1298                                 }
1299                                 tomoyo_set_string(head, match ? "=" : "!=");
1300                                 switch (right) {
1301                                 case TOMOYO_NAME_UNION:
1302                                         tomoyo_print_name_union_quoted
1303                                                 (head, names_p++);
1304                                         break;
1305                                 case TOMOYO_NUMBER_UNION:
1306                                         tomoyo_print_number_union_nospace
1307                                                 (head, numbers_p++);
1308                                         break;
1309                                 default:
1310                                         tomoyo_set_string(head,
1311                                           tomoyo_condition_keyword[right]);
1312                                         break;
1313                                 }
1314                         }
1315                 }
1316                 head->r.cond_step++;
1317                 /* fall through */
1318         case 2:
1319                 if (!tomoyo_flush(head))
1320                         break;
1321                 head->r.cond_step++;
1322                 /* fall through */
1323         case 3:
1324                 if (cond->grant_log != TOMOYO_GRANTLOG_AUTO)
1325                         tomoyo_io_printf(head, " grant_log=%s",
1326                                          tomoyo_yesno(cond->grant_log ==
1327                                                       TOMOYO_GRANTLOG_YES));
1328                 tomoyo_set_lf(head);
1329                 return true;
1330         }
1331         return false;
1332 }
1333
1334 /**
1335  * tomoyo_set_group - Print "acl_group " header keyword and category name.
1336  *
1337  * @head:     Pointer to "struct tomoyo_io_buffer".
1338  * @category: Category name.
1339  *
1340  * Returns nothing.
1341  */
1342 static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1343                              const char *category)
1344 {
1345         if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1346                 tomoyo_print_namespace(head);
1347                 tomoyo_io_printf(head, "acl_group %u ",
1348                                  head->r.acl_group_index);
1349         }
1350         tomoyo_set_string(head, category);
1351 }
1352
1353 /**
1354  * tomoyo_print_entry - Print an ACL entry.
1355  *
1356  * @head: Pointer to "struct tomoyo_io_buffer".
1357  * @acl:  Pointer to an ACL entry.
1358  *
1359  * Returns true on success, false otherwise.
1360  */
1361 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1362                                struct tomoyo_acl_info *acl)
1363 {
1364         const u8 acl_type = acl->type;
1365         bool first = true;
1366         u8 bit;
1367
1368         if (head->r.print_cond_part)
1369                 goto print_cond_part;
1370         if (acl->is_deleted)
1371                 return true;
1372         if (!tomoyo_flush(head))
1373                 return false;
1374         else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1375                 struct tomoyo_path_acl *ptr =
1376                         container_of(acl, typeof(*ptr), head);
1377                 const u16 perm = ptr->perm;
1378                 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1379                         if (!(perm & (1 << bit)))
1380                                 continue;
1381                         if (head->r.print_transition_related_only &&
1382                             bit != TOMOYO_TYPE_EXECUTE)
1383                                 continue;
1384                         if (first) {
1385                                 tomoyo_set_group(head, "file ");
1386                                 first = false;
1387                         } else {
1388                                 tomoyo_set_slash(head);
1389                         }
1390                         tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1391                 }
1392                 if (first)
1393                         return true;
1394                 tomoyo_print_name_union(head, &ptr->name);
1395         } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) {
1396                 struct tomoyo_task_acl *ptr =
1397                         container_of(acl, typeof(*ptr), head);
1398                 tomoyo_set_group(head, "task ");
1399                 tomoyo_set_string(head, "manual_domain_transition ");
1400                 tomoyo_set_string(head, ptr->domainname->name);
1401         } else if (head->r.print_transition_related_only) {
1402                 return true;
1403         } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1404                 struct tomoyo_path2_acl *ptr =
1405                         container_of(acl, typeof(*ptr), head);
1406                 const u8 perm = ptr->perm;
1407                 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1408                         if (!(perm & (1 << bit)))
1409                                 continue;
1410                         if (first) {
1411                                 tomoyo_set_group(head, "file ");
1412                                 first = false;
1413                         } else {
1414                                 tomoyo_set_slash(head);
1415                         }
1416                         tomoyo_set_string(head, tomoyo_mac_keywords
1417                                           [tomoyo_pp2mac[bit]]);
1418                 }
1419                 if (first)
1420                         return true;
1421                 tomoyo_print_name_union(head, &ptr->name1);
1422                 tomoyo_print_name_union(head, &ptr->name2);
1423         } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1424                 struct tomoyo_path_number_acl *ptr =
1425                         container_of(acl, typeof(*ptr), head);
1426                 const u8 perm = ptr->perm;
1427                 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1428                         if (!(perm & (1 << bit)))
1429                                 continue;
1430                         if (first) {
1431                                 tomoyo_set_group(head, "file ");
1432                                 first = false;
1433                         } else {
1434                                 tomoyo_set_slash(head);
1435                         }
1436                         tomoyo_set_string(head, tomoyo_mac_keywords
1437                                           [tomoyo_pn2mac[bit]]);
1438                 }
1439                 if (first)
1440                         return true;
1441                 tomoyo_print_name_union(head, &ptr->name);
1442                 tomoyo_print_number_union(head, &ptr->number);
1443         } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1444                 struct tomoyo_mkdev_acl *ptr =
1445                         container_of(acl, typeof(*ptr), head);
1446                 const u8 perm = ptr->perm;
1447                 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1448                         if (!(perm & (1 << bit)))
1449                                 continue;
1450                         if (first) {
1451                                 tomoyo_set_group(head, "file ");
1452                                 first = false;
1453                         } else {
1454                                 tomoyo_set_slash(head);
1455                         }
1456                         tomoyo_set_string(head, tomoyo_mac_keywords
1457                                           [tomoyo_pnnn2mac[bit]]);
1458                 }
1459                 if (first)
1460                         return true;
1461                 tomoyo_print_name_union(head, &ptr->name);
1462                 tomoyo_print_number_union(head, &ptr->mode);
1463                 tomoyo_print_number_union(head, &ptr->major);
1464                 tomoyo_print_number_union(head, &ptr->minor);
1465         } else if (acl_type == TOMOYO_TYPE_INET_ACL) {
1466                 struct tomoyo_inet_acl *ptr =
1467                         container_of(acl, typeof(*ptr), head);
1468                 const u8 perm = ptr->perm;
1469
1470                 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1471                         if (!(perm & (1 << bit)))
1472                                 continue;
1473                         if (first) {
1474                                 tomoyo_set_group(head, "network inet ");
1475                                 tomoyo_set_string(head, tomoyo_proto_keyword
1476                                                   [ptr->protocol]);
1477                                 tomoyo_set_space(head);
1478                                 first = false;
1479                         } else {
1480                                 tomoyo_set_slash(head);
1481                         }
1482                         tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1483                 }
1484                 if (first)
1485                         return true;
1486                 tomoyo_set_space(head);
1487                 if (ptr->address.group) {
1488                         tomoyo_set_string(head, "@");
1489                         tomoyo_set_string(head, ptr->address.group->group_name
1490                                           ->name);
1491                 } else {
1492                         char buf[128];
1493                         tomoyo_print_ip(buf, sizeof(buf), &ptr->address);
1494                         tomoyo_io_printf(head, "%s", buf);
1495                 }
1496                 tomoyo_print_number_union(head, &ptr->port);
1497         } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) {
1498                 struct tomoyo_unix_acl *ptr =
1499                         container_of(acl, typeof(*ptr), head);
1500                 const u8 perm = ptr->perm;
1501
1502                 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1503                         if (!(perm & (1 << bit)))
1504                                 continue;
1505                         if (first) {
1506                                 tomoyo_set_group(head, "network unix ");
1507                                 tomoyo_set_string(head, tomoyo_proto_keyword
1508                                                   [ptr->protocol]);
1509                                 tomoyo_set_space(head);
1510                                 first = false;
1511                         } else {
1512                                 tomoyo_set_slash(head);
1513                         }
1514                         tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1515                 }
1516                 if (first)
1517                         return true;
1518                 tomoyo_print_name_union(head, &ptr->name);
1519         } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1520                 struct tomoyo_mount_acl *ptr =
1521                         container_of(acl, typeof(*ptr), head);
1522                 tomoyo_set_group(head, "file mount");
1523                 tomoyo_print_name_union(head, &ptr->dev_name);
1524                 tomoyo_print_name_union(head, &ptr->dir_name);
1525                 tomoyo_print_name_union(head, &ptr->fs_type);
1526                 tomoyo_print_number_union(head, &ptr->flags);
1527         } else if (acl_type == TOMOYO_TYPE_ENV_ACL) {
1528                 struct tomoyo_env_acl *ptr =
1529                         container_of(acl, typeof(*ptr), head);
1530
1531                 tomoyo_set_group(head, "misc env ");
1532                 tomoyo_set_string(head, ptr->env->name);
1533         }
1534         if (acl->cond) {
1535                 head->r.print_cond_part = true;
1536                 head->r.cond_step = 0;
1537                 if (!tomoyo_flush(head))
1538                         return false;
1539 print_cond_part:
1540                 if (!tomoyo_print_condition(head, acl->cond))
1541                         return false;
1542                 head->r.print_cond_part = false;
1543         } else {
1544                 tomoyo_set_lf(head);
1545         }
1546         return true;
1547 }
1548
1549 /**
1550  * tomoyo_read_domain2 - Read domain policy.
1551  *
1552  * @head: Pointer to "struct tomoyo_io_buffer".
1553  * @list: Pointer to "struct list_head".
1554  *
1555  * Caller holds tomoyo_read_lock().
1556  *
1557  * Returns true on success, false otherwise.
1558  */
1559 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1560                                 struct list_head *list)
1561 {
1562         list_for_each_cookie(head->r.acl, list) {
1563                 struct tomoyo_acl_info *ptr =
1564                         list_entry(head->r.acl, typeof(*ptr), list);
1565                 if (!tomoyo_print_entry(head, ptr))
1566                         return false;
1567         }
1568         head->r.acl = NULL;
1569         return true;
1570 }
1571
1572 /**
1573  * tomoyo_read_domain - Read domain policy.
1574  *
1575  * @head: Pointer to "struct tomoyo_io_buffer".
1576  *
1577  * Caller holds tomoyo_read_lock().
1578  */
1579 static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1580 {
1581         if (head->r.eof)
1582                 return;
1583         list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1584                 struct tomoyo_domain_info *domain =
1585                         list_entry(head->r.domain, typeof(*domain), list);
1586                 switch (head->r.step) {
1587                         u8 i;
1588                 case 0:
1589                         if (domain->is_deleted &&
1590                             !head->r.print_this_domain_only)
1591                                 continue;
1592                         /* Print domainname and flags. */
1593                         tomoyo_set_string(head, domain->domainname->name);
1594                         tomoyo_set_lf(head);
1595                         tomoyo_io_printf(head, "use_profile %u\n",
1596                                          domain->profile);
1597                         tomoyo_io_printf(head, "use_group %u\n",
1598                                          domain->group);
1599                         for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1600                                 if (domain->flags[i])
1601                                         tomoyo_set_string(head, tomoyo_dif[i]);
1602                         head->r.step++;
1603                         tomoyo_set_lf(head);
1604                         /* fall through */
1605                 case 1:
1606                         if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1607                                 return;
1608                         head->r.step++;
1609                         if (!tomoyo_set_lf(head))
1610                                 return;
1611                         /* fall through */
1612                 case 2:
1613                         head->r.step = 0;
1614                         if (head->r.print_this_domain_only)
1615                                 goto done;
1616                 }
1617         }
1618  done:
1619         head->r.eof = true;
1620 }
1621
1622 /**
1623  * tomoyo_write_pid: Specify PID to obtain domainname.
1624  *
1625  * @head: Pointer to "struct tomoyo_io_buffer".
1626  *
1627  * Returns 0.
1628  */
1629 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1630 {
1631         head->r.eof = false;
1632         return 0;
1633 }
1634
1635 /**
1636  * tomoyo_read_pid - Get domainname of the specified PID.
1637  *
1638  * @head: Pointer to "struct tomoyo_io_buffer".
1639  *
1640  * Returns the domainname which the specified PID is in on success,
1641  * empty string otherwise.
1642  * The PID is specified by tomoyo_write_pid() so that the user can obtain
1643  * using read()/write() interface rather than sysctl() interface.
1644  */
1645 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1646 {
1647         char *buf = head->write_buf;
1648         bool global_pid = false;
1649         unsigned int pid;
1650         struct task_struct *p;
1651         struct tomoyo_domain_info *domain = NULL;
1652
1653         /* Accessing write_buf is safe because head->io_sem is held. */
1654         if (!buf) {
1655                 head->r.eof = true;
1656                 return; /* Do nothing if open(O_RDONLY). */
1657         }
1658         if (head->r.w_pos || head->r.eof)
1659                 return;
1660         head->r.eof = true;
1661         if (tomoyo_str_starts(&buf, "global-pid "))
1662                 global_pid = true;
1663         if (kstrtouint(buf, 10, &pid))
1664                 return;
1665         rcu_read_lock();
1666         if (global_pid)
1667                 p = find_task_by_pid_ns(pid, &init_pid_ns);
1668         else
1669                 p = find_task_by_vpid(pid);
1670         if (p)
1671                 domain = tomoyo_real_domain(p);
1672         rcu_read_unlock();
1673         if (!domain)
1674                 return;
1675         tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1676         tomoyo_set_string(head, domain->domainname->name);
1677 }
1678
1679 /* String table for domain transition control keywords. */
1680 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1681         [TOMOYO_TRANSITION_CONTROL_NO_RESET]      = "no_reset_domain ",
1682         [TOMOYO_TRANSITION_CONTROL_RESET]         = "reset_domain ",
1683         [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1684         [TOMOYO_TRANSITION_CONTROL_INITIALIZE]    = "initialize_domain ",
1685         [TOMOYO_TRANSITION_CONTROL_NO_KEEP]       = "no_keep_domain ",
1686         [TOMOYO_TRANSITION_CONTROL_KEEP]          = "keep_domain ",
1687 };
1688
1689 /* String table for grouping keywords. */
1690 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1691         [TOMOYO_PATH_GROUP]    = "path_group ",
1692         [TOMOYO_NUMBER_GROUP]  = "number_group ",
1693         [TOMOYO_ADDRESS_GROUP] = "address_group ",
1694 };
1695
1696 /**
1697  * tomoyo_write_exception - Write exception policy.
1698  *
1699  * @head: Pointer to "struct tomoyo_io_buffer".
1700  *
1701  * Returns 0 on success, negative value otherwise.
1702  *
1703  * Caller holds tomoyo_read_lock().
1704  */
1705 static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1706 {
1707         const bool is_delete = head->w.is_delete;
1708         struct tomoyo_acl_param param = {
1709                 .ns = head->w.ns,
1710                 .is_delete = is_delete,
1711                 .data = head->write_buf,
1712         };
1713         u8 i;
1714         if (tomoyo_str_starts(&param.data, "aggregator "))
1715                 return tomoyo_write_aggregator(&param);
1716         for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1717                 if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
1718                         return tomoyo_write_transition_control(&param, i);
1719         for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1720                 if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
1721                         return tomoyo_write_group(&param, i);
1722         if (tomoyo_str_starts(&param.data, "acl_group ")) {
1723                 unsigned int group;
1724                 char *data;
1725                 group = simple_strtoul(param.data, &data, 10);
1726                 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1727                         return tomoyo_write_domain2
1728                                 (head->w.ns, &head->w.ns->acl_group[group],
1729                                  data, is_delete);
1730         }
1731         return -EINVAL;
1732 }
1733
1734 /**
1735  * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
1736  *
1737  * @head: Pointer to "struct tomoyo_io_buffer".
1738  * @idx:  Index number.
1739  *
1740  * Returns true on success, false otherwise.
1741  *
1742  * Caller holds tomoyo_read_lock().
1743  */
1744 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1745 {
1746         struct tomoyo_policy_namespace *ns =
1747                 container_of(head->r.ns, typeof(*ns), namespace_list);
1748         struct list_head *list = &ns->group_list[idx];
1749         list_for_each_cookie(head->r.group, list) {
1750                 struct tomoyo_group *group =
1751                         list_entry(head->r.group, typeof(*group), head.list);
1752                 list_for_each_cookie(head->r.acl, &group->member_list) {
1753                         struct tomoyo_acl_head *ptr =
1754                                 list_entry(head->r.acl, typeof(*ptr), list);
1755                         if (ptr->is_deleted)
1756                                 continue;
1757                         if (!tomoyo_flush(head))
1758                                 return false;
1759                         tomoyo_print_namespace(head);
1760                         tomoyo_set_string(head, tomoyo_group_name[idx]);
1761                         tomoyo_set_string(head, group->group_name->name);
1762                         if (idx == TOMOYO_PATH_GROUP) {
1763                                 tomoyo_set_space(head);
1764                                 tomoyo_set_string(head, container_of
1765                                                (ptr, struct tomoyo_path_group,
1766                                                 head)->member_name->name);
1767                         } else if (idx == TOMOYO_NUMBER_GROUP) {
1768                                 tomoyo_print_number_union(head, &container_of
1769                                                           (ptr,
1770                                                    struct tomoyo_number_group,
1771                                                            head)->number);
1772                         } else if (idx == TOMOYO_ADDRESS_GROUP) {
1773                                 char buffer[128];
1774
1775                                 struct tomoyo_address_group *member =
1776                                         container_of(ptr, typeof(*member),
1777                                                      head);
1778                                 tomoyo_print_ip(buffer, sizeof(buffer),
1779                                                 &member->address);
1780                                 tomoyo_io_printf(head, " %s", buffer);
1781                         }
1782                         tomoyo_set_lf(head);
1783                 }
1784                 head->r.acl = NULL;
1785         }
1786         head->r.group = NULL;
1787         return true;
1788 }
1789
1790 /**
1791  * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1792  *
1793  * @head: Pointer to "struct tomoyo_io_buffer".
1794  * @idx:  Index number.
1795  *
1796  * Returns true on success, false otherwise.
1797  *
1798  * Caller holds tomoyo_read_lock().
1799  */
1800 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1801 {
1802         struct tomoyo_policy_namespace *ns =
1803                 container_of(head->r.ns, typeof(*ns), namespace_list);
1804         struct list_head *list = &ns->policy_list[idx];
1805         list_for_each_cookie(head->r.acl, list) {
1806                 struct tomoyo_acl_head *acl =
1807                         container_of(head->r.acl, typeof(*acl), list);
1808                 if (acl->is_deleted)
1809                         continue;
1810                 if (!tomoyo_flush(head))
1811                         return false;
1812                 switch (idx) {
1813                 case TOMOYO_ID_TRANSITION_CONTROL:
1814                         {
1815                                 struct tomoyo_transition_control *ptr =
1816                                         container_of(acl, typeof(*ptr), head);
1817                                 tomoyo_print_namespace(head);
1818                                 tomoyo_set_string(head, tomoyo_transition_type
1819                                                   [ptr->type]);
1820                                 tomoyo_set_string(head, ptr->program ?
1821                                                   ptr->program->name : "any");
1822                                 tomoyo_set_string(head, " from ");
1823                                 tomoyo_set_string(head, ptr->domainname ?
1824                                                   ptr->domainname->name :
1825                                                   "any");
1826                         }
1827                         break;
1828                 case TOMOYO_ID_AGGREGATOR:
1829                         {
1830                                 struct tomoyo_aggregator *ptr =
1831                                         container_of(acl, typeof(*ptr), head);
1832                                 tomoyo_print_namespace(head);
1833                                 tomoyo_set_string(head, "aggregator ");
1834                                 tomoyo_set_string(head,
1835                                                   ptr->original_name->name);
1836                                 tomoyo_set_space(head);
1837                                 tomoyo_set_string(head,
1838                                                ptr->aggregated_name->name);
1839                         }
1840                         break;
1841                 default:
1842                         continue;
1843                 }
1844                 tomoyo_set_lf(head);
1845         }
1846         head->r.acl = NULL;
1847         return true;
1848 }
1849
1850 /**
1851  * tomoyo_read_exception - Read exception policy.
1852  *
1853  * @head: Pointer to "struct tomoyo_io_buffer".
1854  *
1855  * Caller holds tomoyo_read_lock().
1856  */
1857 static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1858 {
1859         struct tomoyo_policy_namespace *ns =
1860                 container_of(head->r.ns, typeof(*ns), namespace_list);
1861         if (head->r.eof)
1862                 return;
1863         while (head->r.step < TOMOYO_MAX_POLICY &&
1864                tomoyo_read_policy(head, head->r.step))
1865                 head->r.step++;
1866         if (head->r.step < TOMOYO_MAX_POLICY)
1867                 return;
1868         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1869                tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1870                 head->r.step++;
1871         if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1872                 return;
1873         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1874                + TOMOYO_MAX_ACL_GROUPS) {
1875                 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1876                         - TOMOYO_MAX_GROUP;
1877                 if (!tomoyo_read_domain2(head, &ns->acl_group
1878                                          [head->r.acl_group_index]))
1879                         return;
1880                 head->r.step++;
1881         }
1882         head->r.eof = true;
1883 }
1884
1885 /* Wait queue for kernel -> userspace notification. */
1886 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1887 /* Wait queue for userspace -> kernel notification. */
1888 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1889
1890 /* Structure for query. */
1891 struct tomoyo_query {
1892         struct list_head list;
1893         struct tomoyo_domain_info *domain;
1894         char *query;
1895         size_t query_len;
1896         unsigned int serial;
1897         u8 timer;
1898         u8 answer;
1899         u8 retry;
1900 };
1901
1902 /* The list for "struct tomoyo_query". */
1903 static LIST_HEAD(tomoyo_query_list);
1904
1905 /* Lock for manipulating tomoyo_query_list. */
1906 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1907
1908 /*
1909  * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1910  * interface.
1911  */
1912 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1913
1914 /**
1915  * tomoyo_truncate - Truncate a line.
1916  *
1917  * @str: String to truncate.
1918  *
1919  * Returns length of truncated @str.
1920  */
1921 static int tomoyo_truncate(char *str)
1922 {
1923         char *start = str;
1924         while (*(unsigned char *) str > (unsigned char) ' ')
1925                 str++;
1926         *str = '\0';
1927         return strlen(start) + 1;
1928 }
1929
1930 /**
1931  * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1932  *
1933  * @domain: Pointer to "struct tomoyo_domain_info".
1934  * @header: Lines containing ACL.
1935  *
1936  * Returns nothing.
1937  */
1938 static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
1939 {
1940         char *buffer;
1941         char *realpath = NULL;
1942         char *argv0 = NULL;
1943         char *symlink = NULL;
1944         char *cp = strchr(header, '\n');
1945         int len;
1946         if (!cp)
1947                 return;
1948         cp = strchr(cp + 1, '\n');
1949         if (!cp)
1950                 return;
1951         *cp++ = '\0';
1952         len = strlen(cp) + 1;
1953         /* strstr() will return NULL if ordering is wrong. */
1954         if (*cp == 'f') {
1955                 argv0 = strstr(header, " argv[]={ \"");
1956                 if (argv0) {
1957                         argv0 += 10;
1958                         len += tomoyo_truncate(argv0) + 14;
1959                 }
1960                 realpath = strstr(header, " exec={ realpath=\"");
1961                 if (realpath) {
1962                         realpath += 8;
1963                         len += tomoyo_truncate(realpath) + 6;
1964                 }
1965                 symlink = strstr(header, " symlink.target=\"");
1966                 if (symlink)
1967                         len += tomoyo_truncate(symlink + 1) + 1;
1968         }
1969         buffer = kmalloc(len, GFP_NOFS);
1970         if (!buffer)
1971                 return;
1972         snprintf(buffer, len - 1, "%s", cp);
1973         if (realpath)
1974                 tomoyo_addprintf(buffer, len, " exec.%s", realpath);
1975         if (argv0)
1976                 tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
1977         if (symlink)
1978                 tomoyo_addprintf(buffer, len, "%s", symlink);
1979         tomoyo_normalize_line(buffer);
1980         if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
1981                                   false))
1982                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
1983         kfree(buffer);
1984 }
1985
1986 /**
1987  * tomoyo_supervisor - Ask for the supervisor's decision.
1988  *
1989  * @r:   Pointer to "struct tomoyo_request_info".
1990  * @fmt: The printf()'s format string, followed by parameters.
1991  *
1992  * Returns 0 if the supervisor decided to permit the access request which
1993  * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1994  * supervisor decided to retry the access request which violated the policy in
1995  * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1996  */
1997 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1998 {
1999         va_list args;
2000         int error;
2001         int len;
2002         static unsigned int tomoyo_serial;
2003         struct tomoyo_query entry = { };
2004         bool quota_exceeded = false;
2005         va_start(args, fmt);
2006         len = vsnprintf((char *) &len, 1, fmt, args) + 1;
2007         va_end(args);
2008         /* Write /sys/kernel/security/tomoyo/audit. */
2009         va_start(args, fmt);
2010         tomoyo_write_log2(r, len, fmt, args);
2011         va_end(args);
2012         /* Nothing more to do if granted. */
2013         if (r->granted)
2014                 return 0;
2015         if (r->mode)
2016                 tomoyo_update_stat(r->mode);
2017         switch (r->mode) {
2018         case TOMOYO_CONFIG_ENFORCING:
2019                 error = -EPERM;
2020                 if (atomic_read(&tomoyo_query_observers))
2021                         break;
2022                 goto out;
2023         case TOMOYO_CONFIG_LEARNING:
2024                 error = 0;
2025                 /* Check max_learning_entry parameter. */
2026                 if (tomoyo_domain_quota_is_ok(r))
2027                         break;
2028                 /* fall through */
2029         default:
2030                 return 0;
2031         }
2032         /* Get message. */
2033         va_start(args, fmt);
2034         entry.query = tomoyo_init_log(r, len, fmt, args);
2035         va_end(args);
2036         if (!entry.query)
2037                 goto out;
2038         entry.query_len = strlen(entry.query) + 1;
2039         if (!error) {
2040                 tomoyo_add_entry(r->domain, entry.query);
2041                 goto out;
2042         }
2043         len = tomoyo_round2(entry.query_len);
2044         entry.domain = r->domain;
2045         spin_lock(&tomoyo_query_list_lock);
2046         if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
2047             tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
2048             >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
2049                 quota_exceeded = true;
2050         } else {
2051                 entry.serial = tomoyo_serial++;
2052                 entry.retry = r->retry;
2053                 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
2054                 list_add_tail(&entry.list, &tomoyo_query_list);
2055         }
2056         spin_unlock(&tomoyo_query_list_lock);
2057         if (quota_exceeded)
2058                 goto out;
2059         /* Give 10 seconds for supervisor's opinion. */
2060         while (entry.timer < 10) {
2061                 wake_up_all(&tomoyo_query_wait);
2062                 if (wait_event_interruptible_timeout
2063                     (tomoyo_answer_wait, entry.answer ||
2064                      !atomic_read(&tomoyo_query_observers), HZ))
2065                         break;
2066                 else
2067                         entry.timer++;
2068         }
2069         spin_lock(&tomoyo_query_list_lock);
2070         list_del(&entry.list);
2071         tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
2072         spin_unlock(&tomoyo_query_list_lock);
2073         switch (entry.answer) {
2074         case 3: /* Asked to retry by administrator. */
2075                 error = TOMOYO_RETRY_REQUEST;
2076                 r->retry++;
2077                 break;
2078         case 1:
2079                 /* Granted by administrator. */
2080                 error = 0;
2081                 break;
2082         default:
2083                 /* Timed out or rejected by administrator. */
2084                 break;
2085         }
2086 out:
2087         kfree(entry.query);
2088         return error;
2089 }
2090
2091 /**
2092  * tomoyo_find_domain_by_qid - Get domain by query id.
2093  *
2094  * @serial: Query ID assigned by tomoyo_supervisor().
2095  *
2096  * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
2097  */
2098 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
2099 (unsigned int serial)
2100 {
2101         struct tomoyo_query *ptr;
2102         struct tomoyo_domain_info *domain = NULL;
2103         spin_lock(&tomoyo_query_list_lock);
2104         list_for_each_entry(ptr, &tomoyo_query_list, list) {
2105                 if (ptr->serial != serial)
2106                         continue;
2107                 domain = ptr->domain;
2108                 break;
2109         }
2110         spin_unlock(&tomoyo_query_list_lock);
2111         return domain;
2112 }
2113
2114 /**
2115  * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
2116  *
2117  * @file: Pointer to "struct file".
2118  * @wait: Pointer to "poll_table".
2119  *
2120  * Returns EPOLLIN | EPOLLRDNORM when ready to read, 0 otherwise.
2121  *
2122  * Waits for access requests which violated policy in enforcing mode.
2123  */
2124 static __poll_t tomoyo_poll_query(struct file *file, poll_table *wait)
2125 {
2126         if (!list_empty(&tomoyo_query_list))
2127                 return EPOLLIN | EPOLLRDNORM;
2128         poll_wait(file, &tomoyo_query_wait, wait);
2129         if (!list_empty(&tomoyo_query_list))
2130                 return EPOLLIN | EPOLLRDNORM;
2131         return 0;
2132 }
2133
2134 /**
2135  * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
2136  *
2137  * @head: Pointer to "struct tomoyo_io_buffer".
2138  */
2139 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
2140 {
2141         struct list_head *tmp;
2142         unsigned int pos = 0;
2143         size_t len = 0;
2144         char *buf;
2145         if (head->r.w_pos)
2146                 return;
2147         if (head->read_buf) {
2148                 kfree(head->read_buf);
2149                 head->read_buf = NULL;
2150         }
2151         spin_lock(&tomoyo_query_list_lock);
2152         list_for_each(tmp, &tomoyo_query_list) {
2153                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2154                 if (pos++ != head->r.query_index)
2155                         continue;
2156                 len = ptr->query_len;
2157                 break;
2158         }
2159         spin_unlock(&tomoyo_query_list_lock);
2160         if (!len) {
2161                 head->r.query_index = 0;
2162                 return;
2163         }
2164         buf = kzalloc(len + 32, GFP_NOFS);
2165         if (!buf)
2166                 return;
2167         pos = 0;
2168         spin_lock(&tomoyo_query_list_lock);
2169         list_for_each(tmp, &tomoyo_query_list) {
2170                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2171                 if (pos++ != head->r.query_index)
2172                         continue;
2173                 /*
2174                  * Some query can be skipped because tomoyo_query_list
2175                  * can change, but I don't care.
2176                  */
2177                 if (len == ptr->query_len)
2178                         snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
2179                                  ptr->retry, ptr->query);
2180                 break;
2181         }
2182         spin_unlock(&tomoyo_query_list_lock);
2183         if (buf[0]) {
2184                 head->read_buf = buf;
2185                 head->r.w[head->r.w_pos++] = buf;
2186                 head->r.query_index++;
2187         } else {
2188                 kfree(buf);
2189         }
2190 }
2191
2192 /**
2193  * tomoyo_write_answer - Write the supervisor's decision.
2194  *
2195  * @head: Pointer to "struct tomoyo_io_buffer".
2196  *
2197  * Returns 0 on success, -EINVAL otherwise.
2198  */
2199 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
2200 {
2201         char *data = head->write_buf;
2202         struct list_head *tmp;
2203         unsigned int serial;
2204         unsigned int answer;
2205         spin_lock(&tomoyo_query_list_lock);
2206         list_for_each(tmp, &tomoyo_query_list) {
2207                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2208                 ptr->timer = 0;
2209         }
2210         spin_unlock(&tomoyo_query_list_lock);
2211         if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
2212                 return -EINVAL;
2213         spin_lock(&tomoyo_query_list_lock);
2214         list_for_each(tmp, &tomoyo_query_list) {
2215                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2216                 if (ptr->serial != serial)
2217                         continue;
2218                 ptr->answer = answer;
2219                 /* Remove from tomoyo_query_list. */
2220                 if (ptr->answer)
2221                         list_del_init(&ptr->list);
2222                 break;
2223         }
2224         spin_unlock(&tomoyo_query_list_lock);
2225         return 0;
2226 }
2227
2228 /**
2229  * tomoyo_read_version: Get version.
2230  *
2231  * @head: Pointer to "struct tomoyo_io_buffer".
2232  *
2233  * Returns version information.
2234  */
2235 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2236 {
2237         if (!head->r.eof) {
2238                 tomoyo_io_printf(head, "2.5.0");
2239                 head->r.eof = true;
2240         }
2241 }
2242
2243 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2244 static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2245         [TOMOYO_STAT_POLICY_UPDATES]    = "update:",
2246         [TOMOYO_STAT_POLICY_LEARNING]   = "violation in learning mode:",
2247         [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2248         [TOMOYO_STAT_POLICY_ENFORCING]  = "violation in enforcing mode:",
2249 };
2250
2251 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2252 static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2253         [TOMOYO_MEMORY_POLICY] = "policy:",
2254         [TOMOYO_MEMORY_AUDIT]  = "audit log:",
2255         [TOMOYO_MEMORY_QUERY]  = "query message:",
2256 };
2257
2258 /* Timestamp counter for last updated. */
2259 static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2260 /* Counter for number of updates. */
2261 static time64_t tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2262
2263 /**
2264  * tomoyo_update_stat - Update statistic counters.
2265  *
2266  * @index: Index for policy type.
2267  *
2268  * Returns nothing.
2269  */
2270 void tomoyo_update_stat(const u8 index)
2271 {
2272         /*
2273          * I don't use atomic operations because race condition is not fatal.
2274          */
2275         tomoyo_stat_updated[index]++;
2276         tomoyo_stat_modified[index] = ktime_get_real_seconds();
2277 }
2278
2279 /**
2280  * tomoyo_read_stat - Read statistic data.
2281  *
2282  * @head: Pointer to "struct tomoyo_io_buffer".
2283  *
2284  * Returns nothing.
2285  */
2286 static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2287 {
2288         u8 i;
2289         unsigned int total = 0;
2290         if (head->r.eof)
2291                 return;
2292         for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2293                 tomoyo_io_printf(head, "Policy %-30s %10u",
2294                                  tomoyo_policy_headers[i],
2295                                  tomoyo_stat_updated[i]);
2296                 if (tomoyo_stat_modified[i]) {
2297                         struct tomoyo_time stamp;
2298                         tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2299                         tomoyo_io_printf(head, " (Last: %04u/%02u/%02u "
2300                                          "%02u:%02u:%02u)",
2301                                          stamp.year, stamp.month, stamp.day,
2302                                          stamp.hour, stamp.min, stamp.sec);
2303                 }
2304                 tomoyo_set_lf(head);
2305         }
2306         for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2307                 unsigned int used = tomoyo_memory_used[i];
2308                 total += used;
2309                 tomoyo_io_printf(head, "Memory used by %-22s %10u",
2310                                  tomoyo_memory_headers[i], used);
2311                 used = tomoyo_memory_quota[i];
2312                 if (used)
2313                         tomoyo_io_printf(head, " (Quota: %10u)", used);
2314                 tomoyo_set_lf(head);
2315         }
2316         tomoyo_io_printf(head, "Total memory used:                    %10u\n",
2317                          total);
2318         head->r.eof = true;
2319 }
2320
2321 /**
2322  * tomoyo_write_stat - Set memory quota.
2323  *
2324  * @head: Pointer to "struct tomoyo_io_buffer".
2325  *
2326  * Returns 0.
2327  */
2328 static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2329 {
2330         char *data = head->write_buf;
2331         u8 i;
2332         if (tomoyo_str_starts(&data, "Memory used by "))
2333                 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2334                         if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2335                                 sscanf(data, "%u", &tomoyo_memory_quota[i]);
2336         return 0;
2337 }
2338
2339 /**
2340  * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2341  *
2342  * @type: Type of interface.
2343  * @file: Pointer to "struct file".
2344  *
2345  * Returns 0 on success, negative value otherwise.
2346  */
2347 int tomoyo_open_control(const u8 type, struct file *file)
2348 {
2349         struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2350
2351         if (!head)
2352                 return -ENOMEM;
2353         mutex_init(&head->io_sem);
2354         head->type = type;
2355         switch (type) {
2356         case TOMOYO_DOMAINPOLICY:
2357                 /* /sys/kernel/security/tomoyo/domain_policy */
2358                 head->write = tomoyo_write_domain;
2359                 head->read = tomoyo_read_domain;
2360                 break;
2361         case TOMOYO_EXCEPTIONPOLICY:
2362                 /* /sys/kernel/security/tomoyo/exception_policy */
2363                 head->write = tomoyo_write_exception;
2364                 head->read = tomoyo_read_exception;
2365                 break;
2366         case TOMOYO_AUDIT:
2367                 /* /sys/kernel/security/tomoyo/audit */
2368                 head->poll = tomoyo_poll_log;
2369                 head->read = tomoyo_read_log;
2370                 break;
2371         case TOMOYO_PROCESS_STATUS:
2372                 /* /sys/kernel/security/tomoyo/.process_status */
2373                 head->write = tomoyo_write_pid;
2374                 head->read = tomoyo_read_pid;
2375                 break;
2376         case TOMOYO_VERSION:
2377                 /* /sys/kernel/security/tomoyo/version */
2378                 head->read = tomoyo_read_version;
2379                 head->readbuf_size = 128;
2380                 break;
2381         case TOMOYO_STAT:
2382                 /* /sys/kernel/security/tomoyo/stat */
2383                 head->write = tomoyo_write_stat;
2384                 head->read = tomoyo_read_stat;
2385                 head->readbuf_size = 1024;
2386                 break;
2387         case TOMOYO_PROFILE:
2388                 /* /sys/kernel/security/tomoyo/profile */
2389                 head->write = tomoyo_write_profile;
2390                 head->read = tomoyo_read_profile;
2391                 break;
2392         case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2393                 head->poll = tomoyo_poll_query;
2394                 head->write = tomoyo_write_answer;
2395                 head->read = tomoyo_read_query;
2396                 break;
2397         case TOMOYO_MANAGER:
2398                 /* /sys/kernel/security/tomoyo/manager */
2399                 head->write = tomoyo_write_manager;
2400                 head->read = tomoyo_read_manager;
2401                 break;
2402         }
2403         if (!(file->f_mode & FMODE_READ)) {
2404                 /*
2405                  * No need to allocate read_buf since it is not opened
2406                  * for reading.
2407                  */
2408                 head->read = NULL;
2409                 head->poll = NULL;
2410         } else if (!head->poll) {
2411                 /* Don't allocate read_buf for poll() access. */
2412                 if (!head->readbuf_size)
2413                         head->readbuf_size = 4096 * 2;
2414                 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2415                 if (!head->read_buf) {
2416                         kfree(head);
2417                         return -ENOMEM;
2418                 }
2419         }
2420         if (!(file->f_mode & FMODE_WRITE)) {
2421                 /*
2422                  * No need to allocate write_buf since it is not opened
2423                  * for writing.
2424                  */
2425                 head->write = NULL;
2426         } else if (head->write) {
2427                 head->writebuf_size = 4096 * 2;
2428                 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2429                 if (!head->write_buf) {
2430                         kfree(head->read_buf);
2431                         kfree(head);
2432                         return -ENOMEM;
2433                 }
2434         }
2435         /*
2436          * If the file is /sys/kernel/security/tomoyo/query , increment the
2437          * observer counter.
2438          * The obserber counter is used by tomoyo_supervisor() to see if
2439          * there is some process monitoring /sys/kernel/security/tomoyo/query.
2440          */
2441         if (type == TOMOYO_QUERY)
2442                 atomic_inc(&tomoyo_query_observers);
2443         file->private_data = head;
2444         tomoyo_notify_gc(head, true);
2445         return 0;
2446 }
2447
2448 /**
2449  * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2450  *
2451  * @file: Pointer to "struct file".
2452  * @wait: Pointer to "poll_table". Maybe NULL.
2453  *
2454  * Returns EPOLLIN | EPOLLRDNORM | EPOLLOUT | EPOLLWRNORM if ready to read/write,
2455  * EPOLLOUT | EPOLLWRNORM otherwise.
2456  */
2457 __poll_t tomoyo_poll_control(struct file *file, poll_table *wait)
2458 {
2459         struct tomoyo_io_buffer *head = file->private_data;
2460         if (head->poll)
2461                 return head->poll(file, wait) | EPOLLOUT | EPOLLWRNORM;
2462         return EPOLLIN | EPOLLRDNORM | EPOLLOUT | EPOLLWRNORM;
2463 }
2464
2465 /**
2466  * tomoyo_set_namespace_cursor - Set namespace to read.
2467  *
2468  * @head: Pointer to "struct tomoyo_io_buffer".
2469  *
2470  * Returns nothing.
2471  */
2472 static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2473 {
2474         struct list_head *ns;
2475         if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2476             head->type != TOMOYO_PROFILE)
2477                 return;
2478         /*
2479          * If this is the first read, or reading previous namespace finished
2480          * and has more namespaces to read, update the namespace cursor.
2481          */
2482         ns = head->r.ns;
2483         if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2484                 /* Clearing is OK because tomoyo_flush() returned true. */
2485                 memset(&head->r, 0, sizeof(head->r));
2486                 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2487         }
2488 }
2489
2490 /**
2491  * tomoyo_has_more_namespace - Check for unread namespaces.
2492  *
2493  * @head: Pointer to "struct tomoyo_io_buffer".
2494  *
2495  * Returns true if we have more entries to print, false otherwise.
2496  */
2497 static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2498 {
2499         return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2500                 head->type == TOMOYO_PROFILE) && head->r.eof &&
2501                 head->r.ns->next != &tomoyo_namespace_list;
2502 }
2503
2504 /**
2505  * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2506  *
2507  * @head:       Pointer to "struct tomoyo_io_buffer".
2508  * @buffer:     Poiner to buffer to write to.
2509  * @buffer_len: Size of @buffer.
2510  *
2511  * Returns bytes read on success, negative value otherwise.
2512  */
2513 ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2514                             const int buffer_len)
2515 {
2516         int len;
2517         int idx;
2518
2519         if (!head->read)
2520                 return -ENOSYS;
2521         if (mutex_lock_interruptible(&head->io_sem))
2522                 return -EINTR;
2523         head->read_user_buf = buffer;
2524         head->read_user_buf_avail = buffer_len;
2525         idx = tomoyo_read_lock();
2526         if (tomoyo_flush(head))
2527                 /* Call the policy handler. */
2528                 do {
2529                         tomoyo_set_namespace_cursor(head);
2530                         head->read(head);
2531                 } while (tomoyo_flush(head) &&
2532                          tomoyo_has_more_namespace(head));
2533         tomoyo_read_unlock(idx);
2534         len = head->read_user_buf - buffer;
2535         mutex_unlock(&head->io_sem);
2536         return len;
2537 }
2538
2539 /**
2540  * tomoyo_parse_policy - Parse a policy line.
2541  *
2542  * @head: Poiter to "struct tomoyo_io_buffer".
2543  * @line: Line to parse.
2544  *
2545  * Returns 0 on success, negative value otherwise.
2546  *
2547  * Caller holds tomoyo_read_lock().
2548  */
2549 static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2550 {
2551         /* Delete request? */
2552         head->w.is_delete = !strncmp(line, "delete ", 7);
2553         if (head->w.is_delete)
2554                 memmove(line, line + 7, strlen(line + 7) + 1);
2555         /* Selecting namespace to update. */
2556         if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2557             head->type == TOMOYO_PROFILE) {
2558                 if (*line == '<') {
2559                         char *cp = strchr(line, ' ');
2560                         if (cp) {
2561                                 *cp++ = '\0';
2562                                 head->w.ns = tomoyo_assign_namespace(line);
2563                                 memmove(line, cp, strlen(cp) + 1);
2564                         } else
2565                                 head->w.ns = NULL;
2566                 } else
2567                         head->w.ns = &tomoyo_kernel_namespace;
2568                 /* Don't allow updating if namespace is invalid. */
2569                 if (!head->w.ns)
2570                         return -ENOENT;
2571         }
2572         /* Do the update. */
2573         return head->write(head);
2574 }
2575
2576 /**
2577  * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2578  *
2579  * @head:       Pointer to "struct tomoyo_io_buffer".
2580  * @buffer:     Pointer to buffer to read from.
2581  * @buffer_len: Size of @buffer.
2582  *
2583  * Returns @buffer_len on success, negative value otherwise.
2584  */
2585 ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2586                              const char __user *buffer, const int buffer_len)
2587 {
2588         int error = buffer_len;
2589         size_t avail_len = buffer_len;
2590         char *cp0 = head->write_buf;
2591         int idx;
2592         if (!head->write)
2593                 return -ENOSYS;
2594         if (!access_ok(buffer, buffer_len))
2595                 return -EFAULT;
2596         if (mutex_lock_interruptible(&head->io_sem))
2597                 return -EINTR;
2598         head->read_user_buf_avail = 0;
2599         idx = tomoyo_read_lock();
2600         /* Read a line and dispatch it to the policy handler. */
2601         while (avail_len > 0) {
2602                 char c;
2603                 if (head->w.avail >= head->writebuf_size - 1) {
2604                         const int len = head->writebuf_size * 2;
2605                         char *cp = kzalloc(len, GFP_NOFS);
2606                         if (!cp) {
2607                                 error = -ENOMEM;
2608                                 break;
2609                         }
2610                         memmove(cp, cp0, head->w.avail);
2611                         kfree(cp0);
2612                         head->write_buf = cp;
2613                         cp0 = cp;
2614                         head->writebuf_size = len;
2615                 }
2616                 if (get_user(c, buffer)) {
2617                         error = -EFAULT;
2618                         break;
2619                 }
2620                 buffer++;
2621                 avail_len--;
2622                 cp0[head->w.avail++] = c;
2623                 if (c != '\n')
2624                         continue;
2625                 cp0[head->w.avail - 1] = '\0';
2626                 head->w.avail = 0;
2627                 tomoyo_normalize_line(cp0);
2628                 if (!strcmp(cp0, "reset")) {
2629                         head->w.ns = &tomoyo_kernel_namespace;
2630                         head->w.domain = NULL;
2631                         memset(&head->r, 0, sizeof(head->r));
2632                         continue;
2633                 }
2634                 /* Don't allow updating policies by non manager programs. */
2635                 switch (head->type) {
2636                 case TOMOYO_PROCESS_STATUS:
2637                         /* This does not write anything. */
2638                         break;
2639                 case TOMOYO_DOMAINPOLICY:
2640                         if (tomoyo_select_domain(head, cp0))
2641                                 continue;
2642                         /* fall through */
2643                 case TOMOYO_EXCEPTIONPOLICY:
2644                         if (!strcmp(cp0, "select transition_only")) {
2645                                 head->r.print_transition_related_only = true;
2646                                 continue;
2647                         }
2648                         /* fall through */
2649                 default:
2650                         if (!tomoyo_manager()) {
2651                                 error = -EPERM;
2652                                 goto out;
2653                         }
2654                 }
2655                 switch (tomoyo_parse_policy(head, cp0)) {
2656                 case -EPERM:
2657                         error = -EPERM;
2658                         goto out;
2659                 case 0:
2660                         switch (head->type) {
2661                         case TOMOYO_DOMAINPOLICY:
2662                         case TOMOYO_EXCEPTIONPOLICY:
2663                         case TOMOYO_STAT:
2664                         case TOMOYO_PROFILE:
2665                         case TOMOYO_MANAGER:
2666                                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2667                                 break;
2668                         default:
2669                                 break;
2670                         }
2671                         break;
2672                 }
2673         }
2674 out:
2675         tomoyo_read_unlock(idx);
2676         mutex_unlock(&head->io_sem);
2677         return error;
2678 }
2679
2680 /**
2681  * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2682  *
2683  * @head: Pointer to "struct tomoyo_io_buffer".
2684  */
2685 void tomoyo_close_control(struct tomoyo_io_buffer *head)
2686 {
2687         /*
2688          * If the file is /sys/kernel/security/tomoyo/query , decrement the
2689          * observer counter.
2690          */
2691         if (head->type == TOMOYO_QUERY &&
2692             atomic_dec_and_test(&tomoyo_query_observers))
2693                 wake_up_all(&tomoyo_answer_wait);
2694         tomoyo_notify_gc(head, false);
2695 }
2696
2697 /**
2698  * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2699  */
2700 void tomoyo_check_profile(void)
2701 {
2702         struct tomoyo_domain_info *domain;
2703         const int idx = tomoyo_read_lock();
2704         tomoyo_policy_loaded = true;
2705         printk(KERN_INFO "TOMOYO: 2.5.0\n");
2706         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2707                 const u8 profile = domain->profile;
2708                 const struct tomoyo_policy_namespace *ns = domain->ns;
2709                 if (ns->profile_version != 20110903)
2710                         printk(KERN_ERR
2711                                "Profile version %u is not supported.\n",
2712                                ns->profile_version);
2713                 else if (!ns->profile_ptr[profile])
2714                         printk(KERN_ERR
2715                                "Profile %u (used by '%s') is not defined.\n",
2716                                profile, domain->domainname->name);
2717                 else
2718                         continue;
2719                 printk(KERN_ERR
2720                        "Userland tools for TOMOYO 2.5 must be installed and "
2721                        "policy must be initialized.\n");
2722                 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.5/ "
2723                        "for more information.\n");
2724                 panic("STOP!");
2725         }
2726         tomoyo_read_unlock(idx);
2727         printk(KERN_INFO "Mandatory Access Control activated.\n");
2728 }
2729
2730 /**
2731  * tomoyo_load_builtin_policy - Load built-in policy.
2732  *
2733  * Returns nothing.
2734  */
2735 void __init tomoyo_load_builtin_policy(void)
2736 {
2737         /*
2738          * This include file is manually created and contains built-in policy
2739          * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2740          * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2741          * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2742          */
2743 #include "builtin-policy.h"
2744         u8 i;
2745         const int idx = tomoyo_read_lock();
2746         for (i = 0; i < 5; i++) {
2747                 struct tomoyo_io_buffer head = { };
2748                 char *start = "";
2749                 switch (i) {
2750                 case 0:
2751                         start = tomoyo_builtin_profile;
2752                         head.type = TOMOYO_PROFILE;
2753                         head.write = tomoyo_write_profile;
2754                         break;
2755                 case 1:
2756                         start = tomoyo_builtin_exception_policy;
2757                         head.type = TOMOYO_EXCEPTIONPOLICY;
2758                         head.write = tomoyo_write_exception;
2759                         break;
2760                 case 2:
2761                         start = tomoyo_builtin_domain_policy;
2762                         head.type = TOMOYO_DOMAINPOLICY;
2763                         head.write = tomoyo_write_domain;
2764                         break;
2765                 case 3:
2766                         start = tomoyo_builtin_manager;
2767                         head.type = TOMOYO_MANAGER;
2768                         head.write = tomoyo_write_manager;
2769                         break;
2770                 case 4:
2771                         start = tomoyo_builtin_stat;
2772                         head.type = TOMOYO_STAT;
2773                         head.write = tomoyo_write_stat;
2774                         break;
2775                 }
2776                 while (1) {
2777                         char *end = strchr(start, '\n');
2778                         if (!end)
2779                                 break;
2780                         *end = '\0';
2781                         tomoyo_normalize_line(start);
2782                         head.write_buf = start;
2783                         tomoyo_parse_policy(&head, start);
2784                         start = end + 1;
2785                 }
2786         }
2787         tomoyo_read_unlock(idx);
2788 #ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2789         tomoyo_check_profile();
2790 #endif
2791 }