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
 201         va_start(args, fmt);
 202         vsnprintf(buffer + pos, len - pos - 1, fmt, args);
 203         va_end(args);
 204 }
 205
 206 /**
 207  * tomoyo_flush - Flush queued string to userspace's buffer.
 208  *
 209  * @head:   Pointer to "struct tomoyo_io_buffer".
 210  *
 211  * Returns true if all data was flushed, false otherwise.
 212  */
 213 static bool tomoyo_flush(struct tomoyo_io_buffer *head)
 214 {
 215         while (head->r.w_pos) {
 216                 const char *w = head->r.w[0];
 217                 size_t len = strlen(w);
 218
 219                 if (len) {
 220                         if (len > head->read_user_buf_avail)
 221                                 len = head->read_user_buf_avail;
 222                         if (!len)
 223                                 return false;
 224                         if (copy_to_user(head->read_user_buf, w, len))
 225                                 return false;
 226                         head->read_user_buf_avail -= len;
 227                         head->read_user_buf += len;
 228                         w += len;
 229                 }
 230                 head->r.w[0] = w;
 231                 if (*w)
 232                         return false;
 233                 /* Add '\0' for audit logs and query. */
 234                 if (head->poll) {
 235                         if (!head->read_user_buf_avail ||
 236                             copy_to_user(head->read_user_buf, "", 1))
 237                                 return false;
 238                         head->read_user_buf_avail--;
 239                         head->read_user_buf++;
 240                 }
 241                 head->r.w_pos--;
 242                 for (len = 0; len < head->r.w_pos; len++)
 243                         head->r.w[len] = head->r.w[len + 1];
 244         }
 245         head->r.avail = 0;
 246         return true;
 247 }
 248
 249 /**
 250  * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
 251  *
 252  * @head:   Pointer to "struct tomoyo_io_buffer".
 253  * @string: String to print.
 254  *
 255  * Note that @string has to be kept valid until @head is kfree()d.
 256  * This means that char[] allocated on stack memory cannot be passed to
 257  * this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
 258  */
 259 static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string)
 260 {
 261         if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) {
 262                 head->r.w[head->r.w_pos++] = string;
 263                 tomoyo_flush(head);
 264         } else
 265                 WARN_ON(1);
 266 }
 267
 268 static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
 269                              ...) __printf(2, 3);
 270
 271 /**
 272  * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
 273  *
 274  * @head: Pointer to "struct tomoyo_io_buffer".
 275  * @fmt:  The printf()'s format string, followed by parameters.
 276  */
 277 static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
 278                              ...)
 279 {
 280         va_list args;
 281         size_t len;
 282         size_t pos = head->r.avail;
 283         int size = head->readbuf_size - pos;
 284
 285         if (size <= 0)
 286                 return;
 287         va_start(args, fmt);
 288         len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
 289         va_end(args);
 290         if (pos + len >= head->readbuf_size) {
 291                 WARN_ON(1);
 292                 return;
 293         }
 294         head->r.avail += len;
 295         tomoyo_set_string(head, head->read_buf + pos);
 296 }
 297
 298 /**
 299  * tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure.
 300  *
 301  * @head: Pointer to "struct tomoyo_io_buffer".
 302  *
 303  * Returns nothing.
 304  */
 305 static void tomoyo_set_space(struct tomoyo_io_buffer *head)
 306 {
 307         tomoyo_set_string(head, " ");
 308 }
 309
 310 /**
 311  * tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure.
 312  *
 313  * @head: Pointer to "struct tomoyo_io_buffer".
 314  *
 315  * Returns nothing.
 316  */
 317 static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
 318 {
 319         tomoyo_set_string(head, "\n");
 320         return !head->r.w_pos;
 321 }
 322
 323 /**
 324  * tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure.
 325  *
 326  * @head: Pointer to "struct tomoyo_io_buffer".
 327  *
 328  * Returns nothing.
 329  */
 330 static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
 331 {
 332         tomoyo_set_string(head, "/");
 333 }
 334
 335 /* List of namespaces. */
 336 LIST_HEAD(tomoyo_namespace_list);
 337 /* True if namespace other than tomoyo_kernel_namespace is defined. */
 338 static bool tomoyo_namespace_enabled;
 339
 340 /**
 341  * tomoyo_init_policy_namespace - Initialize namespace.
 342  *
 343  * @ns: Pointer to "struct tomoyo_policy_namespace".
 344  *
 345  * Returns nothing.
 346  */
 347 void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns)
 348 {
 349         unsigned int idx;
 350
 351         for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++)
 352                 INIT_LIST_HEAD(&ns->acl_group[idx]);
 353         for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++)
 354                 INIT_LIST_HEAD(&ns->group_list[idx]);
 355         for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++)
 356                 INIT_LIST_HEAD(&ns->policy_list[idx]);
 357         ns->profile_version = 20150505;
 358         tomoyo_namespace_enabled = !list_empty(&tomoyo_namespace_list);
 359         list_add_tail_rcu(&ns->namespace_list, &tomoyo_namespace_list);
 360 }
 361
 362 /**
 363  * tomoyo_print_namespace - Print namespace header.
 364  *
 365  * @head: Pointer to "struct tomoyo_io_buffer".
 366  *
 367  * Returns nothing.
 368  */
 369 static void tomoyo_print_namespace(struct tomoyo_io_buffer *head)
 370 {
 371         if (!tomoyo_namespace_enabled)
 372                 return;
 373         tomoyo_set_string(head,
 374                           container_of(head->r.ns,
 375                                        struct tomoyo_policy_namespace,
 376                                        namespace_list)->name);
 377         tomoyo_set_space(head);
 378 }
 379
 380 /**
 381  * tomoyo_print_name_union - Print a tomoyo_name_union.
 382  *
 383  * @head: Pointer to "struct tomoyo_io_buffer".
 384  * @ptr:  Pointer to "struct tomoyo_name_union".
 385  */
 386 static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
 387                                     const struct tomoyo_name_union *ptr)
 388 {
 389         tomoyo_set_space(head);
 390         if (ptr->group) {
 391                 tomoyo_set_string(head, "@");
 392                 tomoyo_set_string(head, ptr->group->group_name->name);
 393         } else {
 394                 tomoyo_set_string(head, ptr->filename->name);
 395         }
 396 }
 397
 398 /**
 399  * tomoyo_print_name_union_quoted - Print a tomoyo_name_union with a quote.
 400  *
 401  * @head: Pointer to "struct tomoyo_io_buffer".
 402  * @ptr:  Pointer to "struct tomoyo_name_union".
 403  *
 404  * Returns nothing.
 405  */
 406 static void tomoyo_print_name_union_quoted(struct tomoyo_io_buffer *head,
 407                                            const struct tomoyo_name_union *ptr)
 408 {
 409         if (ptr->group) {
 410                 tomoyo_set_string(head, "@");
 411                 tomoyo_set_string(head, ptr->group->group_name->name);
 412         } else {
 413                 tomoyo_set_string(head, "\"");
 414                 tomoyo_set_string(head, ptr->filename->name);
 415                 tomoyo_set_string(head, "\"");
 416         }
 417 }
 418
 419 /**
 420  * tomoyo_print_number_union_nospace - Print a tomoyo_number_union without a space.
 421  *
 422  * @head: Pointer to "struct tomoyo_io_buffer".
 423  * @ptr:  Pointer to "struct tomoyo_number_union".
 424  *
 425  * Returns nothing.
 426  */
 427 static void tomoyo_print_number_union_nospace
 428 (struct tomoyo_io_buffer *head, const struct tomoyo_number_union *ptr)
 429 {
 430         if (ptr->group) {
 431                 tomoyo_set_string(head, "@");
 432                 tomoyo_set_string(head, ptr->group->group_name->name);
 433         } else {
 434                 int i;
 435                 unsigned long min = ptr->values[0];
 436                 const unsigned long max = ptr->values[1];
 437                 u8 min_type = ptr->value_type[0];
 438                 const u8 max_type = ptr->value_type[1];
 439                 char buffer[128];
 440
 441                 buffer[0] = '\0';
 442                 for (i = 0; i < 2; i++) {
 443                         switch (min_type) {
 444                         case TOMOYO_VALUE_TYPE_HEXADECIMAL:
 445                                 tomoyo_addprintf(buffer, sizeof(buffer),
 446                                                  "0x%lX", min);
 447                                 break;
 448                         case TOMOYO_VALUE_TYPE_OCTAL:
 449                                 tomoyo_addprintf(buffer, sizeof(buffer),
 450                                                  "0%lo", min);
 451                                 break;
 452                         default:
 453                                 tomoyo_addprintf(buffer, sizeof(buffer), "%lu",
 454                                                  min);
 455                                 break;
 456                         }
 457                         if (min == max && min_type == max_type)
 458                                 break;
 459                         tomoyo_addprintf(buffer, sizeof(buffer), "-");
 460                         min_type = max_type;
 461                         min = max;
 462                 }
 463                 tomoyo_io_printf(head, "%s", buffer);
 464         }
 465 }
 466
 467 /**
 468  * tomoyo_print_number_union - Print a tomoyo_number_union.
 469  *
 470  * @head: Pointer to "struct tomoyo_io_buffer".
 471  * @ptr:  Pointer to "struct tomoyo_number_union".
 472  *
 473  * Returns nothing.
 474  */
 475 static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
 476                                       const struct tomoyo_number_union *ptr)
 477 {
 478         tomoyo_set_space(head);
 479         tomoyo_print_number_union_nospace(head, ptr);
 480 }
 481
 482 /**
 483  * tomoyo_assign_profile - Create a new profile.
 484  *
 485  * @ns:      Pointer to "struct tomoyo_policy_namespace".
 486  * @profile: Profile number to create.
 487  *
 488  * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
 489  */
 490 static struct tomoyo_profile *tomoyo_assign_profile
 491 (struct tomoyo_policy_namespace *ns, const unsigned int profile)
 492 {
 493         struct tomoyo_profile *ptr;
 494         struct tomoyo_profile *entry;
 495
 496         if (profile >= TOMOYO_MAX_PROFILES)
 497                 return NULL;
 498         ptr = ns->profile_ptr[profile];
 499         if (ptr)
 500                 return ptr;
 501         entry = kzalloc(sizeof(*entry), GFP_NOFS | __GFP_NOWARN);
 502         if (mutex_lock_interruptible(&tomoyo_policy_lock))
 503                 goto out;
 504         ptr = ns->profile_ptr[profile];
 505         if (!ptr && tomoyo_memory_ok(entry)) {
 506                 ptr = entry;
 507                 ptr->default_config = TOMOYO_CONFIG_DISABLED |
 508                         TOMOYO_CONFIG_WANT_GRANT_LOG |
 509                         TOMOYO_CONFIG_WANT_REJECT_LOG;
 510                 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
 511                        sizeof(ptr->config));
 512                 ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] =
 513                         CONFIG_SECURITY_TOMOYO_MAX_AUDIT_LOG;
 514                 ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] =
 515                         CONFIG_SECURITY_TOMOYO_MAX_ACCEPT_ENTRY;
 516                 mb(); /* Avoid out-of-order execution. */
 517                 ns->profile_ptr[profile] = ptr;
 518                 entry = NULL;
 519         }
 520         mutex_unlock(&tomoyo_policy_lock);
 521  out:
 522         kfree(entry);
 523         return ptr;
 524 }
 525
 526 /**
 527  * tomoyo_profile - Find a profile.
 528  *
 529  * @ns:      Pointer to "struct tomoyo_policy_namespace".
 530  * @profile: Profile number to find.
 531  *
 532  * Returns pointer to "struct tomoyo_profile".
 533  */
 534 struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns,
 535                                       const u8 profile)
 536 {
 537         static struct tomoyo_profile tomoyo_null_profile;
 538         struct tomoyo_profile *ptr = ns->profile_ptr[profile];
 539
 540         if (!ptr)
 541                 ptr = &tomoyo_null_profile;
 542         return ptr;
 543 }
 544
 545 /**
 546  * tomoyo_find_yesno - Find values for specified keyword.
 547  *
 548  * @string: String to check.
 549  * @find:   Name of keyword.
 550  *
 551  * Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise.
 552  */
 553 static s8 tomoyo_find_yesno(const char *string, const char *find)
 554 {
 555         const char *cp = strstr(string, find);
 556
 557         if (cp) {
 558                 cp += strlen(find);
 559                 if (!strncmp(cp, "=yes", 4))
 560                         return 1;
 561                 else if (!strncmp(cp, "=no", 3))
 562                         return 0;
 563         }
 564         return -1;
 565 }
 566
 567 /**
 568  * tomoyo_set_uint - Set value for specified preference.
 569  *
 570  * @i:      Pointer to "unsigned int".
 571  * @string: String to check.
 572  * @find:   Name of keyword.
 573  *
 574  * Returns nothing.
 575  */
 576 static void tomoyo_set_uint(unsigned int *i, const char *string,
 577                             const char *find)
 578 {
 579         const char *cp = strstr(string, find);
 580
 581         if (cp)
 582                 sscanf(cp + strlen(find), "=%u", i);
 583 }
 584
 585 /**
 586  * tomoyo_set_mode - Set mode for specified profile.
 587  *
 588  * @name:    Name of functionality.
 589  * @value:   Mode for @name.
 590  * @profile: Pointer to "struct tomoyo_profile".
 591  *
 592  * Returns 0 on success, negative value otherwise.
 593  */
 594 static int tomoyo_set_mode(char *name, const char *value,
 595                            struct tomoyo_profile *profile)
 596 {
 597         u8 i;
 598         u8 config;
 599
 600         if (!strcmp(name, "CONFIG")) {
 601                 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
 602                 config = profile->default_config;
 603         } else if (tomoyo_str_starts(&name, "CONFIG::")) {
 604                 config = 0;
 605                 for (i = 0; i < TOMOYO_MAX_MAC_INDEX
 606                              + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
 607                         int len = 0;
 608
 609                         if (i < TOMOYO_MAX_MAC_INDEX) {
 610                                 const u8 c = tomoyo_index2category[i];
 611                                 const char *category =
 612                                         tomoyo_category_keywords[c];
 613
 614                                 len = strlen(category);
 615                                 if (strncmp(name, category, len) ||
 616                                     name[len++] != ':' || name[len++] != ':')
 617                                         continue;
 618                         }
 619                         if (strcmp(name + len, tomoyo_mac_keywords[i]))
 620                                 continue;
 621                         config = profile->config[i];
 622                         break;
 623                 }
 624                 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
 625                         return -EINVAL;
 626         } else {
 627                 return -EINVAL;
 628         }
 629         if (strstr(value, "use_default")) {
 630                 config = TOMOYO_CONFIG_USE_DEFAULT;
 631         } else {
 632                 u8 mode;
 633
 634                 for (mode = 0; mode < 4; mode++)
 635                         if (strstr(value, tomoyo_mode[mode]))
 636                                 /*
 637                                  * Update lower 3 bits in order to distinguish
 638                                  * 'config' from 'TOMOYO_CONFIG_USE_DEFAULT'.
 639                                  */
 640                                 config = (config & ~7) | mode;
 641                 if (config != TOMOYO_CONFIG_USE_DEFAULT) {
 642                         switch (tomoyo_find_yesno(value, "grant_log")) {
 643                         case 1:
 644                                 config |= TOMOYO_CONFIG_WANT_GRANT_LOG;
 645                                 break;
 646                         case 0:
 647                                 config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG;
 648                                 break;
 649                         }
 650                         switch (tomoyo_find_yesno(value, "reject_log")) {
 651                         case 1:
 652                                 config |= TOMOYO_CONFIG_WANT_REJECT_LOG;
 653                                 break;
 654                         case 0:
 655                                 config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG;
 656                                 break;
 657                         }
 658                 }
 659         }
 660         if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
 661                 profile->config[i] = config;
 662         else if (config != TOMOYO_CONFIG_USE_DEFAULT)
 663                 profile->default_config = config;
 664         return 0;
 665 }
 666
 667 /**
 668  * tomoyo_write_profile - Write profile table.
 669  *
 670  * @head: Pointer to "struct tomoyo_io_buffer".
 671  *
 672  * Returns 0 on success, negative value otherwise.
 673  */
 674 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
 675 {
 676         char *data = head->write_buf;
 677         unsigned int i;
 678         char *cp;
 679         struct tomoyo_profile *profile;
 680
 681         if (sscanf(data, "PROFILE_VERSION=%u", &head->w.ns->profile_version)
 682             == 1)
 683                 return 0;
 684         i = simple_strtoul(data, &cp, 10);
 685         if (*cp != '-')
 686                 return -EINVAL;
 687         data = cp + 1;
 688         profile = tomoyo_assign_profile(head->w.ns, i);
 689         if (!profile)
 690                 return -EINVAL;
 691         cp = strchr(data, '=');
 692         if (!cp)
 693                 return -EINVAL;
 694         *cp++ = '\0';
 695         if (!strcmp(data, "COMMENT")) {
 696                 static DEFINE_SPINLOCK(lock);
 697                 const struct tomoyo_path_info *new_comment
 698                         = tomoyo_get_name(cp);
 699                 const struct tomoyo_path_info *old_comment;
 700
 701                 if (!new_comment)
 702                         return -ENOMEM;
 703                 spin_lock(&lock);
 704                 old_comment = profile->comment;
 705                 profile->comment = new_comment;
 706                 spin_unlock(&lock);
 707                 tomoyo_put_name(old_comment);
 708                 return 0;
 709         }
 710         if (!strcmp(data, "PREFERENCE")) {
 711                 for (i = 0; i < TOMOYO_MAX_PREF; i++)
 712                         tomoyo_set_uint(&profile->pref[i], cp,
 713                                         tomoyo_pref_keywords[i]);
 714                 return 0;
 715         }
 716         return tomoyo_set_mode(data, cp, profile);
 717 }
 718
 719 /**
 720  * tomoyo_print_config - Print mode for specified functionality.
 721  *
 722  * @head:   Pointer to "struct tomoyo_io_buffer".
 723  * @config: Mode for that functionality.
 724  *
 725  * Returns nothing.
 726  *
 727  * Caller prints functionality's name.
 728  */
 729 static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
 730 {
 731         tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n",
 732                          tomoyo_mode[config & 3],
 733                          tomoyo_yesno(config & TOMOYO_CONFIG_WANT_GRANT_LOG),
 734                          tomoyo_yesno(config & TOMOYO_CONFIG_WANT_REJECT_LOG));
 735 }
 736
 737 /**
 738  * tomoyo_read_profile - Read profile table.
 739  *
 740  * @head: Pointer to "struct tomoyo_io_buffer".
 741  *
 742  * Returns nothing.
 743  */
 744 static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
 745 {
 746         u8 index;
 747         struct tomoyo_policy_namespace *ns =
 748                 container_of(head->r.ns, typeof(*ns), namespace_list);
 749         const struct tomoyo_profile *profile;
 750
 751         if (head->r.eof)
 752                 return;
 753  next:
 754         index = head->r.index;
 755         profile = ns->profile_ptr[index];
 756         switch (head->r.step) {
 757         case 0:
 758                 tomoyo_print_namespace(head);
 759                 tomoyo_io_printf(head, "PROFILE_VERSION=%u\n",
 760                                  ns->profile_version);
 761                 head->r.step++;
 762                 break;
 763         case 1:
 764                 for ( ; head->r.index < TOMOYO_MAX_PROFILES;
 765                       head->r.index++)
 766                         if (ns->profile_ptr[head->r.index])
 767                                 break;
 768                 if (head->r.index == TOMOYO_MAX_PROFILES) {
 769                         head->r.eof = true;
 770                         return;
 771                 }
 772                 head->r.step++;
 773                 break;
 774         case 2:
 775                 {
 776                         u8 i;
 777                         const struct tomoyo_path_info *comment =
 778                                 profile->comment;
 779
 780                         tomoyo_print_namespace(head);
 781                         tomoyo_io_printf(head, "%u-COMMENT=", index);
 782                         tomoyo_set_string(head, comment ? comment->name : "");
 783                         tomoyo_set_lf(head);
 784                         tomoyo_print_namespace(head);
 785                         tomoyo_io_printf(head, "%u-PREFERENCE={ ", index);
 786                         for (i = 0; i < TOMOYO_MAX_PREF; i++)
 787                                 tomoyo_io_printf(head, "%s=%u ",
 788                                                  tomoyo_pref_keywords[i],
 789                                                  profile->pref[i]);
 790                         tomoyo_set_string(head, "}\n");
 791                         head->r.step++;
 792                 }
 793                 break;
 794         case 3:
 795                 {
 796                         tomoyo_print_namespace(head);
 797                         tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
 798                         tomoyo_print_config(head, profile->default_config);
 799                         head->r.bit = 0;
 800                         head->r.step++;
 801                 }
 802                 break;
 803         case 4:
 804                 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
 805                               + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
 806                         const u8 i = head->r.bit;
 807                         const u8 config = profile->config[i];
 808
 809                         if (config == TOMOYO_CONFIG_USE_DEFAULT)
 810                                 continue;
 811                         tomoyo_print_namespace(head);
 812                         if (i < TOMOYO_MAX_MAC_INDEX)
 813                                 tomoyo_io_printf(head, "%u-CONFIG::%s::%s",
 814                                                  index,
 815                                                  tomoyo_category_keywords
 816                                                  [tomoyo_index2category[i]],
 817                                                  tomoyo_mac_keywords[i]);
 818                         else
 819                                 tomoyo_io_printf(head, "%u-CONFIG::%s", index,
 820                                                  tomoyo_mac_keywords[i]);
 821                         tomoyo_print_config(head, config);
 822                         head->r.bit++;
 823                         break;
 824                 }
 825                 if (head->r.bit == TOMOYO_MAX_MAC_INDEX
 826                     + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
 827                         head->r.index++;
 828                         head->r.step = 1;
 829                 }
 830                 break;
 831         }
 832         if (tomoyo_flush(head))
 833                 goto next;
 834 }
 835
 836 /**
 837  * tomoyo_same_manager - Check for duplicated "struct tomoyo_manager" entry.
 838  *
 839  * @a: Pointer to "struct tomoyo_acl_head".
 840  * @b: Pointer to "struct tomoyo_acl_head".
 841  *
 842  * Returns true if @a == @b, false otherwise.
 843  */
 844 static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
 845                                 const struct tomoyo_acl_head *b)
 846 {
 847         return container_of(a, struct tomoyo_manager, head)->manager ==
 848                 container_of(b, struct tomoyo_manager, head)->manager;
 849 }
 850
 851 /**
 852  * tomoyo_update_manager_entry - Add a manager entry.
 853  *
 854  * @manager:   The path to manager or the domainnamme.
 855  * @is_delete: True if it is a delete request.
 856  *
 857  * Returns 0 on success, negative value otherwise.
 858  *
 859  * Caller holds tomoyo_read_lock().
 860  */
 861 static int tomoyo_update_manager_entry(const char *manager,
 862                                        const bool is_delete)
 863 {
 864         struct tomoyo_manager e = { };
 865         struct tomoyo_acl_param param = {
 866                 /* .ns = &tomoyo_kernel_namespace, */
 867                 .is_delete = is_delete,
 868                 .list = &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER],
 869         };
 870         int error = is_delete ? -ENOENT : -ENOMEM;
 871
 872         if (!tomoyo_correct_domain(manager) &&
 873             !tomoyo_correct_word(manager))
 874                 return -EINVAL;
 875         e.manager = tomoyo_get_name(manager);
 876         if (e.manager) {
 877                 error = tomoyo_update_policy(&e.head, sizeof(e), &param,
 878                                              tomoyo_same_manager);
 879                 tomoyo_put_name(e.manager);
 880         }
 881         return error;
 882 }
 883
 884 /**
 885  * tomoyo_write_manager - Write manager policy.
 886  *
 887  * @head: Pointer to "struct tomoyo_io_buffer".
 888  *
 889  * Returns 0 on success, negative value otherwise.
 890  *
 891  * Caller holds tomoyo_read_lock().
 892  */
 893 static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
 894 {
 895         char *data = head->write_buf;
 896
 897         if (!strcmp(data, "manage_by_non_root")) {
 898                 tomoyo_manage_by_non_root = !head->w.is_delete;
 899                 return 0;
 900         }
 901         return tomoyo_update_manager_entry(data, head->w.is_delete);
 902 }
 903
 904 /**
 905  * tomoyo_read_manager - Read manager policy.
 906  *
 907  * @head: Pointer to "struct tomoyo_io_buffer".
 908  *
 909  * Caller holds tomoyo_read_lock().
 910  */
 911 static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
 912 {
 913         if (head->r.eof)
 914                 return;
 915         list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER]) {
 916                 struct tomoyo_manager *ptr =
 917                         list_entry(head->r.acl, typeof(*ptr), head.list);
 918
 919                 if (ptr->head.is_deleted)
 920                         continue;
 921                 if (!tomoyo_flush(head))
 922                         return;
 923                 tomoyo_set_string(head, ptr->manager->name);
 924                 tomoyo_set_lf(head);
 925         }
 926         head->r.eof = true;
 927 }
 928
 929 /**
 930  * tomoyo_manager - Check whether the current process is a policy manager.
 931  *
 932  * Returns true if the current process is permitted to modify policy
 933  * via /sys/kernel/security/tomoyo/ interface.
 934  *
 935  * Caller holds tomoyo_read_lock().
 936  */
 937 static bool tomoyo_manager(void)
 938 {
 939         struct tomoyo_manager *ptr;
 940         const char *exe;
 941         const struct task_struct *task = current;
 942         const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
 943         bool found = IS_ENABLED(CONFIG_SECURITY_TOMOYO_INSECURE_BUILTIN_SETTING);
 944
 945         if (!tomoyo_policy_loaded)
 946                 return true;
 947         if (!tomoyo_manage_by_non_root &&
 948             (!uid_eq(task->cred->uid,  GLOBAL_ROOT_UID) ||
 949              !uid_eq(task->cred->euid, GLOBAL_ROOT_UID)))
 950                 return false;
 951         exe = tomoyo_get_exe();
 952         if (!exe)
 953                 return false;
 954         list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER], head.list,
 955                                 srcu_read_lock_held(&tomoyo_ss)) {
 956                 if (!ptr->head.is_deleted &&
 957                     (!tomoyo_pathcmp(domainname, ptr->manager) ||
 958                      !strcmp(exe, ptr->manager->name))) {
 959                         found = true;
 960                         break;
 961                 }
 962         }
 963         if (!found) { /* Reduce error messages. */
 964                 static pid_t last_pid;
 965                 const pid_t pid = current->pid;
 966
 967                 if (last_pid != pid) {
 968                         pr_warn("%s ( %s ) is not permitted to update policies.\n",
 969                                 domainname->name, exe);
 970                         last_pid = pid;
 971                 }
 972         }
 973         kfree(exe);
 974         return found;
 975 }
 976
 977 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
 978 (unsigned int serial);
 979
 980 /**
 981  * tomoyo_select_domain - Parse select command.
 982  *
 983  * @head: Pointer to "struct tomoyo_io_buffer".
 984  * @data: String to parse.
 985  *
 986  * Returns true on success, false otherwise.
 987  *
 988  * Caller holds tomoyo_read_lock().
 989  */
 990 static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
 991                                  const char *data)
 992 {
 993         unsigned int pid;
 994         struct tomoyo_domain_info *domain = NULL;
 995         bool global_pid = false;
 996
 997         if (strncmp(data, "select ", 7))
 998                 return false;
 999         data += 7;
1000         if (sscanf(data, "pid=%u", &pid) == 1 ||
1001             (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
1002                 struct task_struct *p;
1003
1004                 rcu_read_lock();
1005                 if (global_pid)
1006                         p = find_task_by_pid_ns(pid, &init_pid_ns);
1007                 else
1008                         p = find_task_by_vpid(pid);
1009                 if (p)
1010                         domain = tomoyo_task(p)->domain_info;
1011                 rcu_read_unlock();
1012         } else if (!strncmp(data, "domain=", 7)) {
1013                 if (tomoyo_domain_def(data + 7))
1014                         domain = tomoyo_find_domain(data + 7);
1015         } else if (sscanf(data, "Q=%u", &pid) == 1) {
1016                 domain = tomoyo_find_domain_by_qid(pid);
1017         } else
1018                 return false;
1019         head->w.domain = domain;
1020         /* Accessing read_buf is safe because head->io_sem is held. */
1021         if (!head->read_buf)
1022                 return true; /* Do nothing if open(O_WRONLY). */
1023         memset(&head->r, 0, sizeof(head->r));
1024         head->r.print_this_domain_only = true;
1025         if (domain)
1026                 head->r.domain = &domain->list;
1027         else
1028                 head->r.eof = true;
1029         tomoyo_io_printf(head, "# select %s\n", data);
1030         if (domain && domain->is_deleted)
1031                 tomoyo_io_printf(head, "# This is a deleted domain.\n");
1032         return true;
1033 }
1034
1035 /**
1036  * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry.
1037  *
1038  * @a: Pointer to "struct tomoyo_acl_info".
1039  * @b: Pointer to "struct tomoyo_acl_info".
1040  *
1041  * Returns true if @a == @b, false otherwise.
1042  */
1043 static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a,
1044                                  const struct tomoyo_acl_info *b)
1045 {
1046         const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head);
1047         const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head);
1048
1049         return p1->domainname == p2->domainname;
1050 }
1051
1052 /**
1053  * tomoyo_write_task - Update task related list.
1054  *
1055  * @param: Pointer to "struct tomoyo_acl_param".
1056  *
1057  * Returns 0 on success, negative value otherwise.
1058  *
1059  * Caller holds tomoyo_read_lock().
1060  */
1061 static int tomoyo_write_task(struct tomoyo_acl_param *param)
1062 {
1063         int error = -EINVAL;
1064
1065         if (tomoyo_str_starts(&param->data, "manual_domain_transition ")) {
1066                 struct tomoyo_task_acl e = {
1067                         .head.type = TOMOYO_TYPE_MANUAL_TASK_ACL,
1068                         .domainname = tomoyo_get_domainname(param),
1069                 };
1070
1071                 if (e.domainname)
1072                         error = tomoyo_update_domain(&e.head, sizeof(e), param,
1073                                                      tomoyo_same_task_acl,
1074                                                      NULL);
1075                 tomoyo_put_name(e.domainname);
1076         }
1077         return error;
1078 }
1079
1080 /**
1081  * tomoyo_delete_domain - Delete a domain.
1082  *
1083  * @domainname: The name of domain.
1084  *
1085  * Returns 0 on success, negative value otherwise.
1086  *
1087  * Caller holds tomoyo_read_lock().
1088  */
1089 static int tomoyo_delete_domain(char *domainname)
1090 {
1091         struct tomoyo_domain_info *domain;
1092         struct tomoyo_path_info name;
1093
1094         name.name = domainname;
1095         tomoyo_fill_path_info(&name);
1096         if (mutex_lock_interruptible(&tomoyo_policy_lock))
1097                 return -EINTR;
1098         /* Is there an active domain? */
1099         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list,
1100                                 srcu_read_lock_held(&tomoyo_ss)) {
1101                 /* Never delete tomoyo_kernel_domain */
1102                 if (domain == &tomoyo_kernel_domain)
1103                         continue;
1104                 if (domain->is_deleted ||
1105                     tomoyo_pathcmp(domain->domainname, &name))
1106                         continue;
1107                 domain->is_deleted = true;
1108                 break;
1109         }
1110         mutex_unlock(&tomoyo_policy_lock);
1111         return 0;
1112 }
1113
1114 /**
1115  * tomoyo_write_domain2 - Write domain policy.
1116  *
1117  * @ns:        Pointer to "struct tomoyo_policy_namespace".
1118  * @list:      Pointer to "struct list_head".
1119  * @data:      Policy to be interpreted.
1120  * @is_delete: True if it is a delete request.
1121  *
1122  * Returns 0 on success, negative value otherwise.
1123  *
1124  * Caller holds tomoyo_read_lock().
1125  */
1126 static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
1127                                 struct list_head *list, char *data,
1128                                 const bool is_delete)
1129 {
1130         struct tomoyo_acl_param param = {
1131                 .ns = ns,
1132                 .list = list,
1133                 .data = data,
1134                 .is_delete = is_delete,
1135         };
1136         static const struct {
1137                 const char *keyword;
1138                 int (*write)(struct tomoyo_acl_param *param);
1139         } tomoyo_callback[5] = {
1140                 { "file ", tomoyo_write_file },
1141                 { "network inet ", tomoyo_write_inet_network },
1142                 { "network unix ", tomoyo_write_unix_network },
1143                 { "misc ", tomoyo_write_misc },
1144                 { "task ", tomoyo_write_task },
1145         };
1146         u8 i;
1147
1148         for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) {
1149                 if (!tomoyo_str_starts(&param.data,
1150                                        tomoyo_callback[i].keyword))
1151                         continue;
1152                 return tomoyo_callback[i].write(&param);
1153         }
1154         return -EINVAL;
1155 }
1156
1157 /* String table for domain flags. */
1158 const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1159         [TOMOYO_DIF_QUOTA_WARNED]      = "quota_exceeded\n",
1160         [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1161 };
1162
1163 /**
1164  * tomoyo_write_domain - Write domain policy.
1165  *
1166  * @head: Pointer to "struct tomoyo_io_buffer".
1167  *
1168  * Returns 0 on success, negative value otherwise.
1169  *
1170  * Caller holds tomoyo_read_lock().
1171  */
1172 static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1173 {
1174         char *data = head->write_buf;
1175         struct tomoyo_policy_namespace *ns;
1176         struct tomoyo_domain_info *domain = head->w.domain;
1177         const bool is_delete = head->w.is_delete;
1178         bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1179         unsigned int idx;
1180
1181         if (*data == '<') {
1182                 int ret = 0;
1183
1184                 domain = NULL;
1185                 if (is_delete)
1186                         ret = tomoyo_delete_domain(data);
1187                 else if (is_select)
1188                         domain = tomoyo_find_domain(data);
1189                 else
1190                         domain = tomoyo_assign_domain(data, false);
1191                 head->w.domain = domain;
1192                 return ret;
1193         }
1194         if (!domain)
1195                 return -EINVAL;
1196         ns = domain->ns;
1197         if (sscanf(data, "use_profile %u", &idx) == 1
1198             && idx < TOMOYO_MAX_PROFILES) {
1199                 if (!tomoyo_policy_loaded || ns->profile_ptr[idx])
1200                         if (!is_delete)
1201                                 domain->profile = (u8) idx;
1202                 return 0;
1203         }
1204         if (sscanf(data, "use_group %u\n", &idx) == 1
1205             && idx < TOMOYO_MAX_ACL_GROUPS) {
1206                 if (!is_delete)
1207                         set_bit(idx, domain->group);
1208                 else
1209                         clear_bit(idx, domain->group);
1210                 return 0;
1211         }
1212         for (idx = 0; idx < TOMOYO_MAX_DOMAIN_INFO_FLAGS; idx++) {
1213                 const char *cp = tomoyo_dif[idx];
1214
1215                 if (strncmp(data, cp, strlen(cp) - 1))
1216                         continue;
1217                 domain->flags[idx] = !is_delete;
1218                 return 0;
1219         }
1220         return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1221                                     is_delete);
1222 }
1223
1224 /**
1225  * tomoyo_print_condition - Print condition part.
1226  *
1227  * @head: Pointer to "struct tomoyo_io_buffer".
1228  * @cond: Pointer to "struct tomoyo_condition".
1229  *
1230  * Returns true on success, false otherwise.
1231  */
1232 static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1233                                    const struct tomoyo_condition *cond)
1234 {
1235         switch (head->r.cond_step) {
1236         case 0:
1237                 head->r.cond_index = 0;
1238                 head->r.cond_step++;
1239                 if (cond->transit) {
1240                         tomoyo_set_space(head);
1241                         tomoyo_set_string(head, cond->transit->name);
1242                 }
1243                 fallthrough;
1244         case 1:
1245                 {
1246                         const u16 condc = cond->condc;
1247                         const struct tomoyo_condition_element *condp =
1248                                 (typeof(condp)) (cond + 1);
1249                         const struct tomoyo_number_union *numbers_p =
1250                                 (typeof(numbers_p)) (condp + condc);
1251                         const struct tomoyo_name_union *names_p =
1252                                 (typeof(names_p))
1253                                 (numbers_p + cond->numbers_count);
1254                         const struct tomoyo_argv *argv =
1255                                 (typeof(argv)) (names_p + cond->names_count);
1256                         const struct tomoyo_envp *envp =
1257                                 (typeof(envp)) (argv + cond->argc);
1258                         u16 skip;
1259
1260                         for (skip = 0; skip < head->r.cond_index; skip++) {
1261                                 const u8 left = condp->left;
1262                                 const u8 right = condp->right;
1263
1264                                 condp++;
1265                                 switch (left) {
1266                                 case TOMOYO_ARGV_ENTRY:
1267                                         argv++;
1268                                         continue;
1269                                 case TOMOYO_ENVP_ENTRY:
1270                                         envp++;
1271                                         continue;
1272                                 case TOMOYO_NUMBER_UNION:
1273                                         numbers_p++;
1274                                         break;
1275                                 }
1276                                 switch (right) {
1277                                 case TOMOYO_NAME_UNION:
1278                                         names_p++;
1279                                         break;
1280                                 case TOMOYO_NUMBER_UNION:
1281                                         numbers_p++;
1282                                         break;
1283                                 }
1284                         }
1285                         while (head->r.cond_index < condc) {
1286                                 const u8 match = condp->equals;
1287                                 const u8 left = condp->left;
1288                                 const u8 right = condp->right;
1289
1290                                 if (!tomoyo_flush(head))
1291                                         return false;
1292                                 condp++;
1293                                 head->r.cond_index++;
1294                                 tomoyo_set_space(head);
1295                                 switch (left) {
1296                                 case TOMOYO_ARGV_ENTRY:
1297                                         tomoyo_io_printf(head,
1298                                                          "exec.argv[%lu]%s=\"",
1299                                                          argv->index, argv->is_not ? "!" : "");
1300                                         tomoyo_set_string(head,
1301                                                           argv->value->name);
1302                                         tomoyo_set_string(head, "\"");
1303                                         argv++;
1304                                         continue;
1305                                 case TOMOYO_ENVP_ENTRY:
1306                                         tomoyo_set_string(head,
1307                                                           "exec.envp[\"");
1308                                         tomoyo_set_string(head,
1309                                                           envp->name->name);
1310                                         tomoyo_io_printf(head, "\"]%s=", envp->is_not ? "!" : "");
1311                                         if (envp->value) {
1312                                                 tomoyo_set_string(head, "\"");
1313                                                 tomoyo_set_string(head, envp->value->name);
1314                                                 tomoyo_set_string(head, "\"");
1315                                         } else {
1316                                                 tomoyo_set_string(head,
1317                                                                   "NULL");
1318                                         }
1319                                         envp++;
1320                                         continue;
1321                                 case TOMOYO_NUMBER_UNION:
1322                                         tomoyo_print_number_union_nospace
1323                                                 (head, numbers_p++);
1324                                         break;
1325                                 default:
1326                                         tomoyo_set_string(head,
1327                                                tomoyo_condition_keyword[left]);
1328                                         break;
1329                                 }
1330                                 tomoyo_set_string(head, match ? "=" : "!=");
1331                                 switch (right) {
1332                                 case TOMOYO_NAME_UNION:
1333                                         tomoyo_print_name_union_quoted
1334                                                 (head, names_p++);
1335                                         break;
1336                                 case TOMOYO_NUMBER_UNION:
1337                                         tomoyo_print_number_union_nospace
1338                                                 (head, numbers_p++);
1339                                         break;
1340                                 default:
1341                                         tomoyo_set_string(head,
1342                                           tomoyo_condition_keyword[right]);
1343                                         break;
1344                                 }
1345                         }
1346                 }
1347                 head->r.cond_step++;
1348                 fallthrough;
1349         case 2:
1350                 if (!tomoyo_flush(head))
1351                         break;
1352                 head->r.cond_step++;
1353                 fallthrough;
1354         case 3:
1355                 if (cond->grant_log != TOMOYO_GRANTLOG_AUTO)
1356                         tomoyo_io_printf(head, " grant_log=%s",
1357                                          tomoyo_yesno(cond->grant_log ==
1358                                                       TOMOYO_GRANTLOG_YES));
1359                 tomoyo_set_lf(head);
1360                 return true;
1361         }
1362         return false;
1363 }
1364
1365 /**
1366  * tomoyo_set_group - Print "acl_group " header keyword and category name.
1367  *
1368  * @head:     Pointer to "struct tomoyo_io_buffer".
1369  * @category: Category name.
1370  *
1371  * Returns nothing.
1372  */
1373 static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1374                              const char *category)
1375 {
1376         if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1377                 tomoyo_print_namespace(head);
1378                 tomoyo_io_printf(head, "acl_group %u ",
1379                                  head->r.acl_group_index);
1380         }
1381         tomoyo_set_string(head, category);
1382 }
1383
1384 /**
1385  * tomoyo_print_entry - Print an ACL entry.
1386  *
1387  * @head: Pointer to "struct tomoyo_io_buffer".
1388  * @acl:  Pointer to an ACL entry.
1389  *
1390  * Returns true on success, false otherwise.
1391  */
1392 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1393                                struct tomoyo_acl_info *acl)
1394 {
1395         const u8 acl_type = acl->type;
1396         bool first = true;
1397         u8 bit;
1398
1399         if (head->r.print_cond_part)
1400                 goto print_cond_part;
1401         if (acl->is_deleted)
1402                 return true;
1403         if (!tomoyo_flush(head))
1404                 return false;
1405         else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1406                 struct tomoyo_path_acl *ptr =
1407                         container_of(acl, typeof(*ptr), head);
1408                 const u16 perm = ptr->perm;
1409
1410                 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1411                         if (!(perm & (1 << bit)))
1412                                 continue;
1413                         if (head->r.print_transition_related_only &&
1414                             bit != TOMOYO_TYPE_EXECUTE)
1415                                 continue;
1416                         if (first) {
1417                                 tomoyo_set_group(head, "file ");
1418                                 first = false;
1419                         } else {
1420                                 tomoyo_set_slash(head);
1421                         }
1422                         tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1423                 }
1424                 if (first)
1425                         return true;
1426                 tomoyo_print_name_union(head, &ptr->name);
1427         } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) {
1428                 struct tomoyo_task_acl *ptr =
1429                         container_of(acl, typeof(*ptr), head);
1430
1431                 tomoyo_set_group(head, "task ");
1432                 tomoyo_set_string(head, "manual_domain_transition ");
1433                 tomoyo_set_string(head, ptr->domainname->name);
1434         } else if (head->r.print_transition_related_only) {
1435                 return true;
1436         } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1437                 struct tomoyo_path2_acl *ptr =
1438                         container_of(acl, typeof(*ptr), head);
1439                 const u8 perm = ptr->perm;
1440
1441                 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1442                         if (!(perm & (1 << bit)))
1443                                 continue;
1444                         if (first) {
1445                                 tomoyo_set_group(head, "file ");
1446                                 first = false;
1447                         } else {
1448                                 tomoyo_set_slash(head);
1449                         }
1450                         tomoyo_set_string(head, tomoyo_mac_keywords
1451                                           [tomoyo_pp2mac[bit]]);
1452                 }
1453                 if (first)
1454                         return true;
1455                 tomoyo_print_name_union(head, &ptr->name1);
1456                 tomoyo_print_name_union(head, &ptr->name2);
1457         } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1458                 struct tomoyo_path_number_acl *ptr =
1459                         container_of(acl, typeof(*ptr), head);
1460                 const u8 perm = ptr->perm;
1461
1462                 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1463                         if (!(perm & (1 << bit)))
1464                                 continue;
1465                         if (first) {
1466                                 tomoyo_set_group(head, "file ");
1467                                 first = false;
1468                         } else {
1469                                 tomoyo_set_slash(head);
1470                         }
1471                         tomoyo_set_string(head, tomoyo_mac_keywords
1472                                           [tomoyo_pn2mac[bit]]);
1473                 }
1474                 if (first)
1475                         return true;
1476                 tomoyo_print_name_union(head, &ptr->name);
1477                 tomoyo_print_number_union(head, &ptr->number);
1478         } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1479                 struct tomoyo_mkdev_acl *ptr =
1480                         container_of(acl, typeof(*ptr), head);
1481                 const u8 perm = ptr->perm;
1482
1483                 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1484                         if (!(perm & (1 << bit)))
1485                                 continue;
1486                         if (first) {
1487                                 tomoyo_set_group(head, "file ");
1488                                 first = false;
1489                         } else {
1490                                 tomoyo_set_slash(head);
1491                         }
1492                         tomoyo_set_string(head, tomoyo_mac_keywords
1493                                           [tomoyo_pnnn2mac[bit]]);
1494                 }
1495                 if (first)
1496                         return true;
1497                 tomoyo_print_name_union(head, &ptr->name);
1498                 tomoyo_print_number_union(head, &ptr->mode);
1499                 tomoyo_print_number_union(head, &ptr->major);
1500                 tomoyo_print_number_union(head, &ptr->minor);
1501         } else if (acl_type == TOMOYO_TYPE_INET_ACL) {
1502                 struct tomoyo_inet_acl *ptr =
1503                         container_of(acl, typeof(*ptr), head);
1504                 const u8 perm = ptr->perm;
1505
1506                 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1507                         if (!(perm & (1 << bit)))
1508                                 continue;
1509                         if (first) {
1510                                 tomoyo_set_group(head, "network inet ");
1511                                 tomoyo_set_string(head, tomoyo_proto_keyword
1512                                                   [ptr->protocol]);
1513                                 tomoyo_set_space(head);
1514                                 first = false;
1515                         } else {
1516                                 tomoyo_set_slash(head);
1517                         }
1518                         tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1519                 }
1520                 if (first)
1521                         return true;
1522                 tomoyo_set_space(head);
1523                 if (ptr->address.group) {
1524                         tomoyo_set_string(head, "@");
1525                         tomoyo_set_string(head, ptr->address.group->group_name
1526                                           ->name);
1527                 } else {
1528                         char buf[128];
1529
1530                         tomoyo_print_ip(buf, sizeof(buf), &ptr->address);
1531                         tomoyo_io_printf(head, "%s", buf);
1532                 }
1533                 tomoyo_print_number_union(head, &ptr->port);
1534         } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) {
1535                 struct tomoyo_unix_acl *ptr =
1536                         container_of(acl, typeof(*ptr), head);
1537                 const u8 perm = ptr->perm;
1538
1539                 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1540                         if (!(perm & (1 << bit)))
1541                                 continue;
1542                         if (first) {
1543                                 tomoyo_set_group(head, "network unix ");
1544                                 tomoyo_set_string(head, tomoyo_proto_keyword
1545                                                   [ptr->protocol]);
1546                                 tomoyo_set_space(head);
1547                                 first = false;
1548                         } else {
1549                                 tomoyo_set_slash(head);
1550                         }
1551                         tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1552                 }
1553                 if (first)
1554                         return true;
1555                 tomoyo_print_name_union(head, &ptr->name);
1556         } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1557                 struct tomoyo_mount_acl *ptr =
1558                         container_of(acl, typeof(*ptr), head);
1559
1560                 tomoyo_set_group(head, "file mount");
1561                 tomoyo_print_name_union(head, &ptr->dev_name);
1562                 tomoyo_print_name_union(head, &ptr->dir_name);
1563                 tomoyo_print_name_union(head, &ptr->fs_type);
1564                 tomoyo_print_number_union(head, &ptr->flags);
1565         } else if (acl_type == TOMOYO_TYPE_ENV_ACL) {
1566                 struct tomoyo_env_acl *ptr =
1567                         container_of(acl, typeof(*ptr), head);
1568
1569                 tomoyo_set_group(head, "misc env ");
1570                 tomoyo_set_string(head, ptr->env->name);
1571         }
1572         if (acl->cond) {
1573                 head->r.print_cond_part = true;
1574                 head->r.cond_step = 0;
1575                 if (!tomoyo_flush(head))
1576                         return false;
1577 print_cond_part:
1578                 if (!tomoyo_print_condition(head, acl->cond))
1579                         return false;
1580                 head->r.print_cond_part = false;
1581         } else {
1582                 tomoyo_set_lf(head);
1583         }
1584         return true;
1585 }
1586
1587 /**
1588  * tomoyo_read_domain2 - Read domain policy.
1589  *
1590  * @head: Pointer to "struct tomoyo_io_buffer".
1591  * @list: Pointer to "struct list_head".
1592  *
1593  * Caller holds tomoyo_read_lock().
1594  *
1595  * Returns true on success, false otherwise.
1596  */
1597 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1598                                 struct list_head *list)
1599 {
1600         list_for_each_cookie(head->r.acl, list) {
1601                 struct tomoyo_acl_info *ptr =
1602                         list_entry(head->r.acl, typeof(*ptr), list);
1603
1604                 if (!tomoyo_print_entry(head, ptr))
1605                         return false;
1606         }
1607         head->r.acl = NULL;
1608         return true;
1609 }
1610
1611 /**
1612  * tomoyo_read_domain - Read domain policy.
1613  *
1614  * @head: Pointer to "struct tomoyo_io_buffer".
1615  *
1616  * Caller holds tomoyo_read_lock().
1617  */
1618 static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1619 {
1620         if (head->r.eof)
1621                 return;
1622         list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1623                 struct tomoyo_domain_info *domain =
1624                         list_entry(head->r.domain, typeof(*domain), list);
1625                 u8 i;
1626
1627                 switch (head->r.step) {
1628                 case 0:
1629                         if (domain->is_deleted &&
1630                             !head->r.print_this_domain_only)
1631                                 continue;
1632                         /* Print domainname and flags. */
1633                         tomoyo_set_string(head, domain->domainname->name);
1634                         tomoyo_set_lf(head);
1635                         tomoyo_io_printf(head, "use_profile %u\n",
1636                                          domain->profile);
1637                         for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1638                                 if (domain->flags[i])
1639                                         tomoyo_set_string(head, tomoyo_dif[i]);
1640                         head->r.index = 0;
1641                         head->r.step++;
1642                         fallthrough;
1643                 case 1:
1644                         while (head->r.index < TOMOYO_MAX_ACL_GROUPS) {
1645                                 i = head->r.index++;
1646                                 if (!test_bit(i, domain->group))
1647                                         continue;
1648                                 tomoyo_io_printf(head, "use_group %u\n", i);
1649                                 if (!tomoyo_flush(head))
1650                                         return;
1651                         }
1652                         head->r.index = 0;
1653                         head->r.step++;
1654                         tomoyo_set_lf(head);
1655                         fallthrough;
1656                 case 2:
1657                         if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1658                                 return;
1659                         head->r.step++;
1660                         if (!tomoyo_set_lf(head))
1661                                 return;
1662                         fallthrough;
1663                 case 3:
1664                         head->r.step = 0;
1665                         if (head->r.print_this_domain_only)
1666                                 goto done;
1667                 }
1668         }
1669  done:
1670         head->r.eof = true;
1671 }
1672
1673 /**
1674  * tomoyo_write_pid: Specify PID to obtain domainname.
1675  *
1676  * @head: Pointer to "struct tomoyo_io_buffer".
1677  *
1678  * Returns 0.
1679  */
1680 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1681 {
1682         head->r.eof = false;
1683         return 0;
1684 }
1685
1686 /**
1687  * tomoyo_read_pid - Get domainname of the specified PID.
1688  *
1689  * @head: Pointer to "struct tomoyo_io_buffer".
1690  *
1691  * Returns the domainname which the specified PID is in on success,
1692  * empty string otherwise.
1693  * The PID is specified by tomoyo_write_pid() so that the user can obtain
1694  * using read()/write() interface rather than sysctl() interface.
1695  */
1696 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1697 {
1698         char *buf = head->write_buf;
1699         bool global_pid = false;
1700         unsigned int pid;
1701         struct task_struct *p;
1702         struct tomoyo_domain_info *domain = NULL;
1703
1704         /* Accessing write_buf is safe because head->io_sem is held. */
1705         if (!buf) {
1706                 head->r.eof = true;
1707                 return; /* Do nothing if open(O_RDONLY). */
1708         }
1709         if (head->r.w_pos || head->r.eof)
1710                 return;
1711         head->r.eof = true;
1712         if (tomoyo_str_starts(&buf, "global-pid "))
1713                 global_pid = true;
1714         if (kstrtouint(buf, 10, &pid))
1715                 return;
1716         rcu_read_lock();
1717         if (global_pid)
1718                 p = find_task_by_pid_ns(pid, &init_pid_ns);
1719         else
1720                 p = find_task_by_vpid(pid);
1721         if (p)
1722                 domain = tomoyo_task(p)->domain_info;
1723         rcu_read_unlock();
1724         if (!domain)
1725                 return;
1726         tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1727         tomoyo_set_string(head, domain->domainname->name);
1728 }
1729
1730 /* String table for domain transition control keywords. */
1731 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1732         [TOMOYO_TRANSITION_CONTROL_NO_RESET]      = "no_reset_domain ",
1733         [TOMOYO_TRANSITION_CONTROL_RESET]         = "reset_domain ",
1734         [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1735         [TOMOYO_TRANSITION_CONTROL_INITIALIZE]    = "initialize_domain ",
1736         [TOMOYO_TRANSITION_CONTROL_NO_KEEP]       = "no_keep_domain ",
1737         [TOMOYO_TRANSITION_CONTROL_KEEP]          = "keep_domain ",
1738 };
1739
1740 /* String table for grouping keywords. */
1741 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1742         [TOMOYO_PATH_GROUP]    = "path_group ",
1743         [TOMOYO_NUMBER_GROUP]  = "number_group ",
1744         [TOMOYO_ADDRESS_GROUP] = "address_group ",
1745 };
1746
1747 /**
1748  * tomoyo_write_exception - Write exception policy.
1749  *
1750  * @head: Pointer to "struct tomoyo_io_buffer".
1751  *
1752  * Returns 0 on success, negative value otherwise.
1753  *
1754  * Caller holds tomoyo_read_lock().
1755  */
1756 static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1757 {
1758         const bool is_delete = head->w.is_delete;
1759         struct tomoyo_acl_param param = {
1760                 .ns = head->w.ns,
1761                 .is_delete = is_delete,
1762                 .data = head->write_buf,
1763         };
1764         u8 i;
1765
1766         if (tomoyo_str_starts(&param.data, "aggregator "))
1767                 return tomoyo_write_aggregator(&param);
1768         for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1769                 if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
1770                         return tomoyo_write_transition_control(&param, i);
1771         for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1772                 if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
1773                         return tomoyo_write_group(&param, i);
1774         if (tomoyo_str_starts(&param.data, "acl_group ")) {
1775                 unsigned int group;
1776                 char *data;
1777
1778                 group = simple_strtoul(param.data, &data, 10);
1779                 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1780                         return tomoyo_write_domain2
1781                                 (head->w.ns, &head->w.ns->acl_group[group],
1782                                  data, is_delete);
1783         }
1784         return -EINVAL;
1785 }
1786
1787 /**
1788  * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
1789  *
1790  * @head: Pointer to "struct tomoyo_io_buffer".
1791  * @idx:  Index number.
1792  *
1793  * Returns true on success, false otherwise.
1794  *
1795  * Caller holds tomoyo_read_lock().
1796  */
1797 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1798 {
1799         struct tomoyo_policy_namespace *ns =
1800                 container_of(head->r.ns, typeof(*ns), namespace_list);
1801         struct list_head *list = &ns->group_list[idx];
1802
1803         list_for_each_cookie(head->r.group, list) {
1804                 struct tomoyo_group *group =
1805                         list_entry(head->r.group, typeof(*group), head.list);
1806
1807                 list_for_each_cookie(head->r.acl, &group->member_list) {
1808                         struct tomoyo_acl_head *ptr =
1809                                 list_entry(head->r.acl, typeof(*ptr), list);
1810
1811                         if (ptr->is_deleted)
1812                                 continue;
1813                         if (!tomoyo_flush(head))
1814                                 return false;
1815                         tomoyo_print_namespace(head);
1816                         tomoyo_set_string(head, tomoyo_group_name[idx]);
1817                         tomoyo_set_string(head, group->group_name->name);
1818                         if (idx == TOMOYO_PATH_GROUP) {
1819                                 tomoyo_set_space(head);
1820                                 tomoyo_set_string(head, container_of
1821                                                (ptr, struct tomoyo_path_group,
1822                                                 head)->member_name->name);
1823                         } else if (idx == TOMOYO_NUMBER_GROUP) {
1824                                 tomoyo_print_number_union(head, &container_of
1825                                                           (ptr,
1826                                                    struct tomoyo_number_group,
1827                                                            head)->number);
1828                         } else if (idx == TOMOYO_ADDRESS_GROUP) {
1829                                 char buffer[128];
1830                                 struct tomoyo_address_group *member =
1831                                         container_of(ptr, typeof(*member),
1832                                                      head);
1833
1834                                 tomoyo_print_ip(buffer, sizeof(buffer),
1835                                                 &member->address);
1836                                 tomoyo_io_printf(head, " %s", buffer);
1837                         }
1838                         tomoyo_set_lf(head);
1839                 }
1840                 head->r.acl = NULL;
1841         }
1842         head->r.group = NULL;
1843         return true;
1844 }
1845
1846 /**
1847  * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1848  *
1849  * @head: Pointer to "struct tomoyo_io_buffer".
1850  * @idx:  Index number.
1851  *
1852  * Returns true on success, false otherwise.
1853  *
1854  * Caller holds tomoyo_read_lock().
1855  */
1856 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1857 {
1858         struct tomoyo_policy_namespace *ns =
1859                 container_of(head->r.ns, typeof(*ns), namespace_list);
1860         struct list_head *list = &ns->policy_list[idx];
1861
1862         list_for_each_cookie(head->r.acl, list) {
1863                 struct tomoyo_acl_head *acl =
1864                         container_of(head->r.acl, typeof(*acl), list);
1865                 if (acl->is_deleted)
1866                         continue;
1867                 if (!tomoyo_flush(head))
1868                         return false;
1869                 switch (idx) {
1870                 case TOMOYO_ID_TRANSITION_CONTROL:
1871                         {
1872                                 struct tomoyo_transition_control *ptr =
1873                                         container_of(acl, typeof(*ptr), head);
1874
1875                                 tomoyo_print_namespace(head);
1876                                 tomoyo_set_string(head, tomoyo_transition_type
1877                                                   [ptr->type]);
1878                                 tomoyo_set_string(head, ptr->program ?
1879                                                   ptr->program->name : "any");
1880                                 tomoyo_set_string(head, " from ");
1881                                 tomoyo_set_string(head, ptr->domainname ?
1882                                                   ptr->domainname->name :
1883                                                   "any");
1884                         }
1885                         break;
1886                 case TOMOYO_ID_AGGREGATOR:
1887                         {
1888                                 struct tomoyo_aggregator *ptr =
1889                                         container_of(acl, typeof(*ptr), head);
1890
1891                                 tomoyo_print_namespace(head);
1892                                 tomoyo_set_string(head, "aggregator ");
1893                                 tomoyo_set_string(head,
1894                                                   ptr->original_name->name);
1895                                 tomoyo_set_space(head);
1896                                 tomoyo_set_string(head,
1897                                                ptr->aggregated_name->name);
1898                         }
1899                         break;
1900                 default:
1901                         continue;
1902                 }
1903                 tomoyo_set_lf(head);
1904         }
1905         head->r.acl = NULL;
1906         return true;
1907 }
1908
1909 /**
1910  * tomoyo_read_exception - Read exception policy.
1911  *
1912  * @head: Pointer to "struct tomoyo_io_buffer".
1913  *
1914  * Caller holds tomoyo_read_lock().
1915  */
1916 static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1917 {
1918         struct tomoyo_policy_namespace *ns =
1919                 container_of(head->r.ns, typeof(*ns), namespace_list);
1920
1921         if (head->r.eof)
1922                 return;
1923         while (head->r.step < TOMOYO_MAX_POLICY &&
1924                tomoyo_read_policy(head, head->r.step))
1925                 head->r.step++;
1926         if (head->r.step < TOMOYO_MAX_POLICY)
1927                 return;
1928         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1929                tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1930                 head->r.step++;
1931         if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1932                 return;
1933         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1934                + TOMOYO_MAX_ACL_GROUPS) {
1935                 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1936                         - TOMOYO_MAX_GROUP;
1937                 if (!tomoyo_read_domain2(head, &ns->acl_group
1938                                          [head->r.acl_group_index]))
1939                         return;
1940                 head->r.step++;
1941         }
1942         head->r.eof = true;
1943 }
1944
1945 /* Wait queue for kernel -> userspace notification. */
1946 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1947 /* Wait queue for userspace -> kernel notification. */
1948 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1949
1950 /* Structure for query. */
1951 struct tomoyo_query {
1952         struct list_head list;
1953         struct tomoyo_domain_info *domain;
1954         char *query;
1955         size_t query_len;
1956         unsigned int serial;
1957         u8 timer;
1958         u8 answer;
1959         u8 retry;
1960 };
1961
1962 /* The list for "struct tomoyo_query". */
1963 static LIST_HEAD(tomoyo_query_list);
1964
1965 /* Lock for manipulating tomoyo_query_list. */
1966 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1967
1968 /*
1969  * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1970  * interface.
1971  */
1972 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1973
1974 /**
1975  * tomoyo_truncate - Truncate a line.
1976  *
1977  * @str: String to truncate.
1978  *
1979  * Returns length of truncated @str.
1980  */
1981 static int tomoyo_truncate(char *str)
1982 {
1983         char *start = str;
1984
1985         while (*(unsigned char *) str > (unsigned char) ' ')
1986                 str++;
1987         *str = '\0';
1988         return strlen(start) + 1;
1989 }
1990
1991 /**
1992  * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1993  *
1994  * @domain: Pointer to "struct tomoyo_domain_info".
1995  * @header: Lines containing ACL.
1996  *
1997  * Returns nothing.
1998  */
1999 static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
2000 {
2001         char *buffer;
2002         char *realpath = NULL;
2003         char *argv0 = NULL;
2004         char *symlink = NULL;
2005         char *cp = strchr(header, '\n');
2006         int len;
2007
2008         if (!cp)
2009                 return;
2010         cp = strchr(cp + 1, '\n');
2011         if (!cp)
2012                 return;
2013         *cp++ = '\0';
2014         len = strlen(cp) + 1;
2015         /* strstr() will return NULL if ordering is wrong. */
2016         if (*cp == 'f') {
2017                 argv0 = strstr(header, " argv[]={ \"");
2018                 if (argv0) {
2019                         argv0 += 10;
2020                         len += tomoyo_truncate(argv0) + 14;
2021                 }
2022                 realpath = strstr(header, " exec={ realpath=\"");
2023                 if (realpath) {
2024                         realpath += 8;
2025                         len += tomoyo_truncate(realpath) + 6;
2026                 }
2027                 symlink = strstr(header, " symlink.target=\"");
2028                 if (symlink)
2029                         len += tomoyo_truncate(symlink + 1) + 1;
2030         }
2031         buffer = kmalloc(len, GFP_NOFS);
2032         if (!buffer)
2033                 return;
2034         snprintf(buffer, len - 1, "%s", cp);
2035         if (realpath)
2036                 tomoyo_addprintf(buffer, len, " exec.%s", realpath);
2037         if (argv0)
2038                 tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
2039         if (symlink)
2040                 tomoyo_addprintf(buffer, len, "%s", symlink);
2041         tomoyo_normalize_line(buffer);
2042         if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
2043                                   false))
2044                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2045         kfree(buffer);
2046 }
2047
2048 /**
2049  * tomoyo_supervisor - Ask for the supervisor's decision.
2050  *
2051  * @r:   Pointer to "struct tomoyo_request_info".
2052  * @fmt: The printf()'s format string, followed by parameters.
2053  *
2054  * Returns 0 if the supervisor decided to permit the access request which
2055  * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
2056  * supervisor decided to retry the access request which violated the policy in
2057  * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
2058  */
2059 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
2060 {
2061         va_list args;
2062         int error;
2063         int len;
2064         static unsigned int tomoyo_serial;
2065         struct tomoyo_query entry = { };
2066         bool quota_exceeded = false;
2067
2068         va_start(args, fmt);
2069         len = vsnprintf((char *) &len, 1, fmt, args) + 1;
2070         va_end(args);
2071         /* Write /sys/kernel/security/tomoyo/audit. */
2072         va_start(args, fmt);
2073         tomoyo_write_log2(r, len, fmt, args);
2074         va_end(args);
2075         /* Nothing more to do if granted. */
2076         if (r->granted)
2077                 return 0;
2078         if (r->mode)
2079                 tomoyo_update_stat(r->mode);
2080         switch (r->mode) {
2081         case TOMOYO_CONFIG_ENFORCING:
2082                 error = -EPERM;
2083                 if (atomic_read(&tomoyo_query_observers))
2084                         break;
2085                 goto out;
2086         case TOMOYO_CONFIG_LEARNING:
2087                 error = 0;
2088                 /* Check max_learning_entry parameter. */
2089                 if (tomoyo_domain_quota_is_ok(r))
2090                         break;
2091                 fallthrough;
2092         default:
2093                 return 0;
2094         }
2095         /* Get message. */
2096         va_start(args, fmt);
2097         entry.query = tomoyo_init_log(r, len, fmt, args);
2098         va_end(args);
2099         if (!entry.query)
2100                 goto out;
2101         entry.query_len = strlen(entry.query) + 1;
2102         if (!error) {
2103                 tomoyo_add_entry(r->domain, entry.query);
2104                 goto out;
2105         }
2106         len = tomoyo_round2(entry.query_len);
2107         entry.domain = r->domain;
2108         spin_lock(&tomoyo_query_list_lock);
2109         if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
2110             tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
2111             >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
2112                 quota_exceeded = true;
2113         } else {
2114                 entry.serial = tomoyo_serial++;
2115                 entry.retry = r->retry;
2116                 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
2117                 list_add_tail(&entry.list, &tomoyo_query_list);
2118         }
2119         spin_unlock(&tomoyo_query_list_lock);
2120         if (quota_exceeded)
2121                 goto out;
2122         /* Give 10 seconds for supervisor's opinion. */
2123         while (entry.timer < 10) {
2124                 wake_up_all(&tomoyo_query_wait);
2125                 if (wait_event_interruptible_timeout
2126                     (tomoyo_answer_wait, entry.answer ||
2127                      !atomic_read(&tomoyo_query_observers), HZ))
2128                         break;
2129                 entry.timer++;
2130         }
2131         spin_lock(&tomoyo_query_list_lock);
2132         list_del(&entry.list);
2133         tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
2134         spin_unlock(&tomoyo_query_list_lock);
2135         switch (entry.answer) {
2136         case 3: /* Asked to retry by administrator. */
2137                 error = TOMOYO_RETRY_REQUEST;
2138                 r->retry++;
2139                 break;
2140         case 1:
2141                 /* Granted by administrator. */
2142                 error = 0;
2143                 break;
2144         default:
2145                 /* Timed out or rejected by administrator. */
2146                 break;
2147         }
2148 out:
2149         kfree(entry.query);
2150         return error;
2151 }
2152
2153 /**
2154  * tomoyo_find_domain_by_qid - Get domain by query id.
2155  *
2156  * @serial: Query ID assigned by tomoyo_supervisor().
2157  *
2158  * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
2159  */
2160 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
2161 (unsigned int serial)
2162 {
2163         struct tomoyo_query *ptr;
2164         struct tomoyo_domain_info *domain = NULL;
2165
2166         spin_lock(&tomoyo_query_list_lock);
2167         list_for_each_entry(ptr, &tomoyo_query_list, list) {
2168                 if (ptr->serial != serial)
2169                         continue;
2170                 domain = ptr->domain;
2171                 break;
2172         }
2173         spin_unlock(&tomoyo_query_list_lock);
2174         return domain;
2175 }
2176
2177 /**
2178  * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
2179  *
2180  * @file: Pointer to "struct file".
2181  * @wait: Pointer to "poll_table".
2182  *
2183  * Returns EPOLLIN | EPOLLRDNORM when ready to read, 0 otherwise.
2184  *
2185  * Waits for access requests which violated policy in enforcing mode.
2186  */
2187 static __poll_t tomoyo_poll_query(struct file *file, poll_table *wait)
2188 {
2189         if (!list_empty(&tomoyo_query_list))
2190                 return EPOLLIN | EPOLLRDNORM;
2191         poll_wait(file, &tomoyo_query_wait, wait);
2192         if (!list_empty(&tomoyo_query_list))
2193                 return EPOLLIN | EPOLLRDNORM;
2194         return 0;
2195 }
2196
2197 /**
2198  * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
2199  *
2200  * @head: Pointer to "struct tomoyo_io_buffer".
2201  */
2202 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
2203 {
2204         struct list_head *tmp;
2205         unsigned int pos = 0;
2206         size_t len = 0;
2207         char *buf;
2208
2209         if (head->r.w_pos)
2210                 return;
2211         kfree(head->read_buf);
2212         head->read_buf = NULL;
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
2217                 if (pos++ != head->r.query_index)
2218                         continue;
2219                 len = ptr->query_len;
2220                 break;
2221         }
2222         spin_unlock(&tomoyo_query_list_lock);
2223         if (!len) {
2224                 head->r.query_index = 0;
2225                 return;
2226         }
2227         buf = kzalloc(len + 32, GFP_NOFS);
2228         if (!buf)
2229                 return;
2230         pos = 0;
2231         spin_lock(&tomoyo_query_list_lock);
2232         list_for_each(tmp, &tomoyo_query_list) {
2233                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2234
2235                 if (pos++ != head->r.query_index)
2236                         continue;
2237                 /*
2238                  * Some query can be skipped because tomoyo_query_list
2239                  * can change, but I don't care.
2240                  */
2241                 if (len == ptr->query_len)
2242                         snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
2243                                  ptr->retry, ptr->query);
2244                 break;
2245         }
2246         spin_unlock(&tomoyo_query_list_lock);
2247         if (buf[0]) {
2248                 head->read_buf = buf;
2249                 head->r.w[head->r.w_pos++] = buf;
2250                 head->r.query_index++;
2251         } else {
2252                 kfree(buf);
2253         }
2254 }
2255
2256 /**
2257  * tomoyo_write_answer - Write the supervisor's decision.
2258  *
2259  * @head: Pointer to "struct tomoyo_io_buffer".
2260  *
2261  * Returns 0 on success, -EINVAL otherwise.
2262  */
2263 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
2264 {
2265         char *data = head->write_buf;
2266         struct list_head *tmp;
2267         unsigned int serial;
2268         unsigned int answer;
2269
2270         spin_lock(&tomoyo_query_list_lock);
2271         list_for_each(tmp, &tomoyo_query_list) {
2272                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2273
2274                 ptr->timer = 0;
2275         }
2276         spin_unlock(&tomoyo_query_list_lock);
2277         if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
2278                 return -EINVAL;
2279         spin_lock(&tomoyo_query_list_lock);
2280         list_for_each(tmp, &tomoyo_query_list) {
2281                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2282
2283                 if (ptr->serial != serial)
2284                         continue;
2285                 ptr->answer = answer;
2286                 /* Remove from tomoyo_query_list. */
2287                 if (ptr->answer)
2288                         list_del_init(&ptr->list);
2289                 break;
2290         }
2291         spin_unlock(&tomoyo_query_list_lock);
2292         return 0;
2293 }
2294
2295 /**
2296  * tomoyo_read_version: Get version.
2297  *
2298  * @head: Pointer to "struct tomoyo_io_buffer".
2299  *
2300  * Returns version information.
2301  */
2302 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2303 {
2304         if (!head->r.eof) {
2305                 tomoyo_io_printf(head, "2.6.0");
2306                 head->r.eof = true;
2307         }
2308 }
2309
2310 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2311 static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2312         [TOMOYO_STAT_POLICY_UPDATES]    = "update:",
2313         [TOMOYO_STAT_POLICY_LEARNING]   = "violation in learning mode:",
2314         [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2315         [TOMOYO_STAT_POLICY_ENFORCING]  = "violation in enforcing mode:",
2316 };
2317
2318 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2319 static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2320         [TOMOYO_MEMORY_POLICY] = "policy:",
2321         [TOMOYO_MEMORY_AUDIT]  = "audit log:",
2322         [TOMOYO_MEMORY_QUERY]  = "query message:",
2323 };
2324
2325 /* Counter for number of updates. */
2326 static atomic_t tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2327 /* Timestamp counter for last updated. */
2328 static time64_t tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2329
2330 /**
2331  * tomoyo_update_stat - Update statistic counters.
2332  *
2333  * @index: Index for policy type.
2334  *
2335  * Returns nothing.
2336  */
2337 void tomoyo_update_stat(const u8 index)
2338 {
2339         atomic_inc(&tomoyo_stat_updated[index]);
2340         tomoyo_stat_modified[index] = ktime_get_real_seconds();
2341 }
2342
2343 /**
2344  * tomoyo_read_stat - Read statistic data.
2345  *
2346  * @head: Pointer to "struct tomoyo_io_buffer".
2347  *
2348  * Returns nothing.
2349  */
2350 static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2351 {
2352         u8 i;
2353         unsigned int total = 0;
2354
2355         if (head->r.eof)
2356                 return;
2357         for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2358                 tomoyo_io_printf(head, "Policy %-30s %10u",
2359                                  tomoyo_policy_headers[i],
2360                                  atomic_read(&tomoyo_stat_updated[i]));
2361                 if (tomoyo_stat_modified[i]) {
2362                         struct tomoyo_time stamp;
2363
2364                         tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2365                         tomoyo_io_printf(head, " (Last: %04u/%02u/%02u %02u:%02u:%02u)",
2366                                          stamp.year, stamp.month, stamp.day,
2367                                          stamp.hour, stamp.min, stamp.sec);
2368                 }
2369                 tomoyo_set_lf(head);
2370         }
2371         for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2372                 unsigned int used = tomoyo_memory_used[i];
2373
2374                 total += used;
2375                 tomoyo_io_printf(head, "Memory used by %-22s %10u",
2376                                  tomoyo_memory_headers[i], used);
2377                 used = tomoyo_memory_quota[i];
2378                 if (used)
2379                         tomoyo_io_printf(head, " (Quota: %10u)", used);
2380                 tomoyo_set_lf(head);
2381         }
2382         tomoyo_io_printf(head, "Total memory used:                    %10u\n",
2383                          total);
2384         head->r.eof = true;
2385 }
2386
2387 /**
2388  * tomoyo_write_stat - Set memory quota.
2389  *
2390  * @head: Pointer to "struct tomoyo_io_buffer".
2391  *
2392  * Returns 0.
2393  */
2394 static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2395 {
2396         char *data = head->write_buf;
2397         u8 i;
2398
2399         if (tomoyo_str_starts(&data, "Memory used by "))
2400                 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2401                         if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2402                                 sscanf(data, "%u", &tomoyo_memory_quota[i]);
2403         return 0;
2404 }
2405
2406 /**
2407  * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2408  *
2409  * @type: Type of interface.
2410  * @file: Pointer to "struct file".
2411  *
2412  * Returns 0 on success, negative value otherwise.
2413  */
2414 int tomoyo_open_control(const u8 type, struct file *file)
2415 {
2416         struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2417
2418         if (!head)
2419                 return -ENOMEM;
2420         mutex_init(&head->io_sem);
2421         head->type = type;
2422         switch (type) {
2423         case TOMOYO_DOMAINPOLICY:
2424                 /* /sys/kernel/security/tomoyo/domain_policy */
2425                 head->write = tomoyo_write_domain;
2426                 head->read = tomoyo_read_domain;
2427                 break;
2428         case TOMOYO_EXCEPTIONPOLICY:
2429                 /* /sys/kernel/security/tomoyo/exception_policy */
2430                 head->write = tomoyo_write_exception;
2431                 head->read = tomoyo_read_exception;
2432                 break;
2433         case TOMOYO_AUDIT:
2434                 /* /sys/kernel/security/tomoyo/audit */
2435                 head->poll = tomoyo_poll_log;
2436                 head->read = tomoyo_read_log;
2437                 break;
2438         case TOMOYO_PROCESS_STATUS:
2439                 /* /sys/kernel/security/tomoyo/.process_status */
2440                 head->write = tomoyo_write_pid;
2441                 head->read = tomoyo_read_pid;
2442                 break;
2443         case TOMOYO_VERSION:
2444                 /* /sys/kernel/security/tomoyo/version */
2445                 head->read = tomoyo_read_version;
2446                 head->readbuf_size = 128;
2447                 break;
2448         case TOMOYO_STAT:
2449                 /* /sys/kernel/security/tomoyo/stat */
2450                 head->write = tomoyo_write_stat;
2451                 head->read = tomoyo_read_stat;
2452                 head->readbuf_size = 1024;
2453                 break;
2454         case TOMOYO_PROFILE:
2455                 /* /sys/kernel/security/tomoyo/profile */
2456                 head->write = tomoyo_write_profile;
2457                 head->read = tomoyo_read_profile;
2458                 break;
2459         case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2460                 head->poll = tomoyo_poll_query;
2461                 head->write = tomoyo_write_answer;
2462                 head->read = tomoyo_read_query;
2463                 break;
2464         case TOMOYO_MANAGER:
2465                 /* /sys/kernel/security/tomoyo/manager */
2466                 head->write = tomoyo_write_manager;
2467                 head->read = tomoyo_read_manager;
2468                 break;
2469         }
2470         if (!(file->f_mode & FMODE_READ)) {
2471                 /*
2472                  * No need to allocate read_buf since it is not opened
2473                  * for reading.
2474                  */
2475                 head->read = NULL;
2476                 head->poll = NULL;
2477         } else if (!head->poll) {
2478                 /* Don't allocate read_buf for poll() access. */
2479                 if (!head->readbuf_size)
2480                         head->readbuf_size = 4096 * 2;
2481                 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2482                 if (!head->read_buf) {
2483                         kfree(head);
2484                         return -ENOMEM;
2485                 }
2486         }
2487         if (!(file->f_mode & FMODE_WRITE)) {
2488                 /*
2489                  * No need to allocate write_buf since it is not opened
2490                  * for writing.
2491                  */
2492                 head->write = NULL;
2493         } else if (head->write) {
2494                 head->writebuf_size = 4096 * 2;
2495                 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2496                 if (!head->write_buf) {
2497                         kfree(head->read_buf);
2498                         kfree(head);
2499                         return -ENOMEM;
2500                 }
2501         }
2502         /*
2503          * If the file is /sys/kernel/security/tomoyo/query , increment the
2504          * observer counter.
2505          * The obserber counter is used by tomoyo_supervisor() to see if
2506          * there is some process monitoring /sys/kernel/security/tomoyo/query.
2507          */
2508         if (type == TOMOYO_QUERY)
2509                 atomic_inc(&tomoyo_query_observers);
2510         file->private_data = head;
2511         tomoyo_notify_gc(head, true);
2512         return 0;
2513 }
2514
2515 /**
2516  * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2517  *
2518  * @file: Pointer to "struct file".
2519  * @wait: Pointer to "poll_table". Maybe NULL.
2520  *
2521  * Returns EPOLLIN | EPOLLRDNORM | EPOLLOUT | EPOLLWRNORM if ready to read/write,
2522  * EPOLLOUT | EPOLLWRNORM otherwise.
2523  */
2524 __poll_t tomoyo_poll_control(struct file *file, poll_table *wait)
2525 {
2526         struct tomoyo_io_buffer *head = file->private_data;
2527
2528         if (head->poll)
2529                 return head->poll(file, wait) | EPOLLOUT | EPOLLWRNORM;
2530         return EPOLLIN | EPOLLRDNORM | EPOLLOUT | EPOLLWRNORM;
2531 }
2532
2533 /**
2534  * tomoyo_set_namespace_cursor - Set namespace to read.
2535  *
2536  * @head: Pointer to "struct tomoyo_io_buffer".
2537  *
2538  * Returns nothing.
2539  */
2540 static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2541 {
2542         struct list_head *ns;
2543
2544         if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2545             head->type != TOMOYO_PROFILE)
2546                 return;
2547         /*
2548          * If this is the first read, or reading previous namespace finished
2549          * and has more namespaces to read, update the namespace cursor.
2550          */
2551         ns = head->r.ns;
2552         if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2553                 /* Clearing is OK because tomoyo_flush() returned true. */
2554                 memset(&head->r, 0, sizeof(head->r));
2555                 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2556         }
2557 }
2558
2559 /**
2560  * tomoyo_has_more_namespace - Check for unread namespaces.
2561  *
2562  * @head: Pointer to "struct tomoyo_io_buffer".
2563  *
2564  * Returns true if we have more entries to print, false otherwise.
2565  */
2566 static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2567 {
2568         return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2569                 head->type == TOMOYO_PROFILE) && head->r.eof &&
2570                 head->r.ns->next != &tomoyo_namespace_list;
2571 }
2572
2573 /**
2574  * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2575  *
2576  * @head:       Pointer to "struct tomoyo_io_buffer".
2577  * @buffer:     Pointer to buffer to write to.
2578  * @buffer_len: Size of @buffer.
2579  *
2580  * Returns bytes read on success, negative value otherwise.
2581  */
2582 ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2583                             const int buffer_len)
2584 {
2585         int len;
2586         int idx;
2587
2588         if (!head->read)
2589                 return -EINVAL;
2590         if (mutex_lock_interruptible(&head->io_sem))
2591                 return -EINTR;
2592         head->read_user_buf = buffer;
2593         head->read_user_buf_avail = buffer_len;
2594         idx = tomoyo_read_lock();
2595         if (tomoyo_flush(head))
2596                 /* Call the policy handler. */
2597                 do {
2598                         tomoyo_set_namespace_cursor(head);
2599                         head->read(head);
2600                 } while (tomoyo_flush(head) &&
2601                          tomoyo_has_more_namespace(head));
2602         tomoyo_read_unlock(idx);
2603         len = head->read_user_buf - buffer;
2604         mutex_unlock(&head->io_sem);
2605         return len;
2606 }
2607
2608 /**
2609  * tomoyo_parse_policy - Parse a policy line.
2610  *
2611  * @head: Pointer to "struct tomoyo_io_buffer".
2612  * @line: Line to parse.
2613  *
2614  * Returns 0 on success, negative value otherwise.
2615  *
2616  * Caller holds tomoyo_read_lock().
2617  */
2618 static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2619 {
2620         /* Delete request? */
2621         head->w.is_delete = !strncmp(line, "delete ", 7);
2622         if (head->w.is_delete)
2623                 memmove(line, line + 7, strlen(line + 7) + 1);
2624         /* Selecting namespace to update. */
2625         if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2626             head->type == TOMOYO_PROFILE) {
2627                 if (*line == '<') {
2628                         char *cp = strchr(line, ' ');
2629
2630                         if (cp) {
2631                                 *cp++ = '\0';
2632                                 head->w.ns = tomoyo_assign_namespace(line);
2633                                 memmove(line, cp, strlen(cp) + 1);
2634                         } else
2635                                 head->w.ns = NULL;
2636                 } else
2637                         head->w.ns = &tomoyo_kernel_namespace;
2638                 /* Don't allow updating if namespace is invalid. */
2639                 if (!head->w.ns)
2640                         return -ENOENT;
2641         }
2642         /* Do the update. */
2643         return head->write(head);
2644 }
2645
2646 /**
2647  * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2648  *
2649  * @head:       Pointer to "struct tomoyo_io_buffer".
2650  * @buffer:     Pointer to buffer to read from.
2651  * @buffer_len: Size of @buffer.
2652  *
2653  * Returns @buffer_len on success, negative value otherwise.
2654  */
2655 ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2656                              const char __user *buffer, const int buffer_len)
2657 {
2658         int error = buffer_len;
2659         size_t avail_len = buffer_len;
2660         char *cp0 = head->write_buf;
2661         int idx;
2662
2663         if (!head->write)
2664                 return -EINVAL;
2665         if (mutex_lock_interruptible(&head->io_sem))
2666                 return -EINTR;
2667         head->read_user_buf_avail = 0;
2668         idx = tomoyo_read_lock();
2669         /* Read a line and dispatch it to the policy handler. */
2670         while (avail_len > 0) {
2671                 char c;
2672
2673                 if (head->w.avail >= head->writebuf_size - 1) {
2674                         const int len = head->writebuf_size * 2;
2675                         char *cp = kzalloc(len, GFP_NOFS);
2676
2677                         if (!cp) {
2678                                 error = -ENOMEM;
2679                                 break;
2680                         }
2681                         memmove(cp, cp0, head->w.avail);
2682                         kfree(cp0);
2683                         head->write_buf = cp;
2684                         cp0 = cp;
2685                         head->writebuf_size = len;
2686                 }
2687                 if (get_user(c, buffer)) {
2688                         error = -EFAULT;
2689                         break;
2690                 }
2691                 buffer++;
2692                 avail_len--;
2693                 cp0[head->w.avail++] = c;
2694                 if (c != '\n')
2695                         continue;
2696                 cp0[head->w.avail - 1] = '\0';
2697                 head->w.avail = 0;
2698                 tomoyo_normalize_line(cp0);
2699                 if (!strcmp(cp0, "reset")) {
2700                         head->w.ns = &tomoyo_kernel_namespace;
2701                         head->w.domain = NULL;
2702                         memset(&head->r, 0, sizeof(head->r));
2703                         continue;
2704                 }
2705                 /* Don't allow updating policies by non manager programs. */
2706                 switch (head->type) {
2707                 case TOMOYO_PROCESS_STATUS:
2708                         /* This does not write anything. */
2709                         break;
2710                 case TOMOYO_DOMAINPOLICY:
2711                         if (tomoyo_select_domain(head, cp0))
2712                                 continue;
2713                         fallthrough;
2714                 case TOMOYO_EXCEPTIONPOLICY:
2715                         if (!strcmp(cp0, "select transition_only")) {
2716                                 head->r.print_transition_related_only = true;
2717                                 continue;
2718                         }
2719                         fallthrough;
2720                 default:
2721                         if (!tomoyo_manager()) {
2722                                 error = -EPERM;
2723                                 goto out;
2724                         }
2725                 }
2726                 switch (tomoyo_parse_policy(head, cp0)) {
2727                 case -EPERM:
2728                         error = -EPERM;
2729                         goto out;
2730                 case 0:
2731                         switch (head->type) {
2732                         case TOMOYO_DOMAINPOLICY:
2733                         case TOMOYO_EXCEPTIONPOLICY:
2734                         case TOMOYO_STAT:
2735                         case TOMOYO_PROFILE:
2736                         case TOMOYO_MANAGER:
2737                                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2738                                 break;
2739                         default:
2740                                 break;
2741                         }
2742                         break;
2743                 }
2744         }
2745 out:
2746         tomoyo_read_unlock(idx);
2747         mutex_unlock(&head->io_sem);
2748         return error;
2749 }
2750
2751 /**
2752  * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2753  *
2754  * @head: Pointer to "struct tomoyo_io_buffer".
2755  */
2756 void tomoyo_close_control(struct tomoyo_io_buffer *head)
2757 {
2758         /*
2759          * If the file is /sys/kernel/security/tomoyo/query , decrement the
2760          * observer counter.
2761          */
2762         if (head->type == TOMOYO_QUERY &&
2763             atomic_dec_and_test(&tomoyo_query_observers))
2764                 wake_up_all(&tomoyo_answer_wait);
2765         tomoyo_notify_gc(head, false);
2766 }
2767
2768 /**
2769  * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2770  */
2771 void tomoyo_check_profile(void)
2772 {
2773         struct tomoyo_domain_info *domain;
2774         const int idx = tomoyo_read_lock();
2775
2776         tomoyo_policy_loaded = true;
2777         pr_info("TOMOYO: 2.6.0\n");
2778         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list,
2779                                 srcu_read_lock_held(&tomoyo_ss)) {
2780                 const u8 profile = domain->profile;
2781                 struct tomoyo_policy_namespace *ns = domain->ns;
2782
2783                 if (ns->profile_version == 20110903) {
2784                         pr_info_once("Converting profile version from %u to %u.\n",
2785                                      20110903, 20150505);
2786                         ns->profile_version = 20150505;
2787                 }
2788                 if (ns->profile_version != 20150505)
2789                         pr_err("Profile version %u is not supported.\n",
2790                                ns->profile_version);
2791                 else if (!ns->profile_ptr[profile])
2792                         pr_err("Profile %u (used by '%s') is not defined.\n",
2793                                profile, domain->domainname->name);
2794                 else
2795                         continue;
2796                 pr_err("Userland tools for TOMOYO 2.6 must be installed and policy must be initialized.\n");
2797                 pr_err("Please see https://tomoyo.osdn.jp/2.6/ for more information.\n");
2798                 panic("STOP!");
2799         }
2800         tomoyo_read_unlock(idx);
2801         pr_info("Mandatory Access Control activated.\n");
2802 }
2803
2804 /**
2805  * tomoyo_load_builtin_policy - Load built-in policy.
2806  *
2807  * Returns nothing.
2808  */
2809 void __init tomoyo_load_builtin_policy(void)
2810 {
2811 #ifdef CONFIG_SECURITY_TOMOYO_INSECURE_BUILTIN_SETTING
2812         static char tomoyo_builtin_profile[] __initdata =
2813                 "PROFILE_VERSION=20150505\n"
2814                 "0-CONFIG={ mode=learning grant_log=no reject_log=yes }\n";
2815         static char tomoyo_builtin_exception_policy[] __initdata =
2816                 "aggregator proc:/self/exe /proc/self/exe\n";
2817         static char tomoyo_builtin_domain_policy[] __initdata = "";
2818         static char tomoyo_builtin_manager[] __initdata = "";
2819         static char tomoyo_builtin_stat[] __initdata = "";
2820 #else
2821         /*
2822          * This include file is manually created and contains built-in policy
2823          * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2824          * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2825          * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2826          */
2827 #include "builtin-policy.h"
2828 #endif
2829         u8 i;
2830         const int idx = tomoyo_read_lock();
2831
2832         for (i = 0; i < 5; i++) {
2833                 struct tomoyo_io_buffer head = { };
2834                 char *start = "";
2835
2836                 switch (i) {
2837                 case 0:
2838                         start = tomoyo_builtin_profile;
2839                         head.type = TOMOYO_PROFILE;
2840                         head.write = tomoyo_write_profile;
2841                         break;
2842                 case 1:
2843                         start = tomoyo_builtin_exception_policy;
2844                         head.type = TOMOYO_EXCEPTIONPOLICY;
2845                         head.write = tomoyo_write_exception;
2846                         break;
2847                 case 2:
2848                         start = tomoyo_builtin_domain_policy;
2849                         head.type = TOMOYO_DOMAINPOLICY;
2850                         head.write = tomoyo_write_domain;
2851                         break;
2852                 case 3:
2853                         start = tomoyo_builtin_manager;
2854                         head.type = TOMOYO_MANAGER;
2855                         head.write = tomoyo_write_manager;
2856                         break;
2857                 case 4:
2858                         start = tomoyo_builtin_stat;
2859                         head.type = TOMOYO_STAT;
2860                         head.write = tomoyo_write_stat;
2861                         break;
2862                 }
2863                 while (1) {
2864                         char *end = strchr(start, '\n');
2865
2866                         if (!end)
2867                                 break;
2868                         *end = '\0';
2869                         tomoyo_normalize_line(start);
2870                         head.write_buf = start;
2871                         tomoyo_parse_policy(&head, start);
2872                         start = end + 1;
2873                 }
2874         }
2875         tomoyo_read_unlock(idx);
2876 #ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2877         tomoyo_check_profile();
2878 #endif
2879 }