security/tomoyo/common.c

   1 /*
   2  * security/tomoyo/common.c
   3  *
   4  * Copyright (C) 2005-2011  NTT DATA CORPORATION
   5  */
   6
   7 #include <linux/uaccess.h>
   8 #include <linux/slab.h>
   9 #include <linux/security.h>
  10 #include "common.h"
  11
  12 /* String table for operation mode. */
  13 const char * const tomoyo_mode[TOMOYO_CONFIG_MAX_MODE] = {
  14         [TOMOYO_CONFIG_DISABLED]   = "disabled",
  15         [TOMOYO_CONFIG_LEARNING]   = "learning",
  16         [TOMOYO_CONFIG_PERMISSIVE] = "permissive",
  17         [TOMOYO_CONFIG_ENFORCING]  = "enforcing"
  18 };
  19
  20 /* String table for /sys/kernel/security/tomoyo/profile */
  21 const char * const tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
  22                                        + TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
  23         [TOMOYO_MAC_FILE_EXECUTE]    = "execute",
  24         [TOMOYO_MAC_FILE_OPEN]       = "open",
  25         [TOMOYO_MAC_FILE_CREATE]     = "create",
  26         [TOMOYO_MAC_FILE_UNLINK]     = "unlink",
  27         [TOMOYO_MAC_FILE_GETATTR]    = "getattr",
  28         [TOMOYO_MAC_FILE_MKDIR]      = "mkdir",
  29         [TOMOYO_MAC_FILE_RMDIR]      = "rmdir",
  30         [TOMOYO_MAC_FILE_MKFIFO]     = "mkfifo",
  31         [TOMOYO_MAC_FILE_MKSOCK]     = "mksock",
  32         [TOMOYO_MAC_FILE_TRUNCATE]   = "truncate",
  33         [TOMOYO_MAC_FILE_SYMLINK]    = "symlink",
  34         [TOMOYO_MAC_FILE_MKBLOCK]    = "mkblock",
  35         [TOMOYO_MAC_FILE_MKCHAR]     = "mkchar",
  36         [TOMOYO_MAC_FILE_LINK]       = "link",
  37         [TOMOYO_MAC_FILE_RENAME]     = "rename",
  38         [TOMOYO_MAC_FILE_CHMOD]      = "chmod",
  39         [TOMOYO_MAC_FILE_CHOWN]      = "chown",
  40         [TOMOYO_MAC_FILE_CHGRP]      = "chgrp",
  41         [TOMOYO_MAC_FILE_IOCTL]      = "ioctl",
  42         [TOMOYO_MAC_FILE_CHROOT]     = "chroot",
  43         [TOMOYO_MAC_FILE_MOUNT]      = "mount",
  44         [TOMOYO_MAC_FILE_UMOUNT]     = "unmount",
  45         [TOMOYO_MAC_FILE_PIVOT_ROOT] = "pivot_root",
  46         [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file",
  47 };
  48
  49 /* String table for conditions. */
  50 const char * const tomoyo_condition_keyword[TOMOYO_MAX_CONDITION_KEYWORD] = {
  51         [TOMOYO_TASK_UID]             = "task.uid",
  52         [TOMOYO_TASK_EUID]            = "task.euid",
  53         [TOMOYO_TASK_SUID]            = "task.suid",
  54         [TOMOYO_TASK_FSUID]           = "task.fsuid",
  55         [TOMOYO_TASK_GID]             = "task.gid",
  56         [TOMOYO_TASK_EGID]            = "task.egid",
  57         [TOMOYO_TASK_SGID]            = "task.sgid",
  58         [TOMOYO_TASK_FSGID]           = "task.fsgid",
  59         [TOMOYO_TASK_PID]             = "task.pid",
  60         [TOMOYO_TASK_PPID]            = "task.ppid",
  61         [TOMOYO_EXEC_ARGC]            = "exec.argc",
  62         [TOMOYO_EXEC_ENVC]            = "exec.envc",
  63         [TOMOYO_TYPE_IS_SOCKET]       = "socket",
  64         [TOMOYO_TYPE_IS_SYMLINK]      = "symlink",
  65         [TOMOYO_TYPE_IS_FILE]         = "file",
  66         [TOMOYO_TYPE_IS_BLOCK_DEV]    = "block",
  67         [TOMOYO_TYPE_IS_DIRECTORY]    = "directory",
  68         [TOMOYO_TYPE_IS_CHAR_DEV]     = "char",
  69         [TOMOYO_TYPE_IS_FIFO]         = "fifo",
  70         [TOMOYO_MODE_SETUID]          = "setuid",
  71         [TOMOYO_MODE_SETGID]          = "setgid",
  72         [TOMOYO_MODE_STICKY]          = "sticky",
  73         [TOMOYO_MODE_OWNER_READ]      = "owner_read",
  74         [TOMOYO_MODE_OWNER_WRITE]     = "owner_write",
  75         [TOMOYO_MODE_OWNER_EXECUTE]   = "owner_execute",
  76         [TOMOYO_MODE_GROUP_READ]      = "group_read",
  77         [TOMOYO_MODE_GROUP_WRITE]     = "group_write",
  78         [TOMOYO_MODE_GROUP_EXECUTE]   = "group_execute",
  79         [TOMOYO_MODE_OTHERS_READ]     = "others_read",
  80         [TOMOYO_MODE_OTHERS_WRITE]    = "others_write",
  81         [TOMOYO_MODE_OTHERS_EXECUTE]  = "others_execute",
  82         [TOMOYO_EXEC_REALPATH]        = "exec.realpath",
  83         [TOMOYO_SYMLINK_TARGET]       = "symlink.target",
  84         [TOMOYO_PATH1_UID]            = "path1.uid",
  85         [TOMOYO_PATH1_GID]            = "path1.gid",
  86         [TOMOYO_PATH1_INO]            = "path1.ino",
  87         [TOMOYO_PATH1_MAJOR]          = "path1.major",
  88         [TOMOYO_PATH1_MINOR]          = "path1.minor",
  89         [TOMOYO_PATH1_PERM]           = "path1.perm",
  90         [TOMOYO_PATH1_TYPE]           = "path1.type",
  91         [TOMOYO_PATH1_DEV_MAJOR]      = "path1.dev_major",
  92         [TOMOYO_PATH1_DEV_MINOR]      = "path1.dev_minor",
  93         [TOMOYO_PATH2_UID]            = "path2.uid",
  94         [TOMOYO_PATH2_GID]            = "path2.gid",
  95         [TOMOYO_PATH2_INO]            = "path2.ino",
  96         [TOMOYO_PATH2_MAJOR]          = "path2.major",
  97         [TOMOYO_PATH2_MINOR]          = "path2.minor",
  98         [TOMOYO_PATH2_PERM]           = "path2.perm",
  99         [TOMOYO_PATH2_TYPE]           = "path2.type",
 100         [TOMOYO_PATH2_DEV_MAJOR]      = "path2.dev_major",
 101         [TOMOYO_PATH2_DEV_MINOR]      = "path2.dev_minor",
 102         [TOMOYO_PATH1_PARENT_UID]     = "path1.parent.uid",
 103         [TOMOYO_PATH1_PARENT_GID]     = "path1.parent.gid",
 104         [TOMOYO_PATH1_PARENT_INO]     = "path1.parent.ino",
 105         [TOMOYO_PATH1_PARENT_PERM]    = "path1.parent.perm",
 106         [TOMOYO_PATH2_PARENT_UID]     = "path2.parent.uid",
 107         [TOMOYO_PATH2_PARENT_GID]     = "path2.parent.gid",
 108         [TOMOYO_PATH2_PARENT_INO]     = "path2.parent.ino",
 109         [TOMOYO_PATH2_PARENT_PERM]    = "path2.parent.perm",
 110 };
 111
 112 /* String table for PREFERENCE keyword. */
 113 static const char * const tomoyo_pref_keywords[TOMOYO_MAX_PREF] = {
 114         [TOMOYO_PREF_MAX_AUDIT_LOG]      = "max_audit_log",
 115         [TOMOYO_PREF_MAX_LEARNING_ENTRY] = "max_learning_entry",
 116 };
 117
 118 /* String table for path operation. */
 119 const char * const tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = {
 120         [TOMOYO_TYPE_EXECUTE]    = "execute",
 121         [TOMOYO_TYPE_READ]       = "read",
 122         [TOMOYO_TYPE_WRITE]      = "write",
 123         [TOMOYO_TYPE_APPEND]     = "append",
 124         [TOMOYO_TYPE_UNLINK]     = "unlink",
 125         [TOMOYO_TYPE_GETATTR]    = "getattr",
 126         [TOMOYO_TYPE_RMDIR]      = "rmdir",
 127         [TOMOYO_TYPE_TRUNCATE]   = "truncate",
 128         [TOMOYO_TYPE_SYMLINK]    = "symlink",
 129         [TOMOYO_TYPE_CHROOT]     = "chroot",
 130         [TOMOYO_TYPE_UMOUNT]     = "unmount",
 131 };
 132
 133 /* String table for categories. */
 134 static const char * const tomoyo_category_keywords
 135 [TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
 136         [TOMOYO_MAC_CATEGORY_FILE]       = "file",
 137 };
 138
 139 /* Permit policy management by non-root user? */
 140 static bool tomoyo_manage_by_non_root;
 141
 142 /* Utility functions. */
 143
 144 /**
 145  * tomoyo_yesno - Return "yes" or "no".
 146  *
 147  * @value: Bool value.
 148  */
 149 const char *tomoyo_yesno(const unsigned int value)
 150 {
 151         return value ? "yes" : "no";
 152 }
 153
 154 /**
 155  * tomoyo_addprintf - strncat()-like-snprintf().
 156  *
 157  * @buffer: Buffer to write to. Must be '\0'-terminated.
 158  * @len:    Size of @buffer.
 159  * @fmt:    The printf()'s format string, followed by parameters.
 160  *
 161  * Returns nothing.
 162  */
 163 static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...)
 164 {
 165         va_list args;
 166         const int pos = strlen(buffer);
 167         va_start(args, fmt);
 168         vsnprintf(buffer + pos, len - pos - 1, fmt, args);
 169         va_end(args);
 170 }
 171
 172 /**
 173  * tomoyo_flush - Flush queued string to userspace's buffer.
 174  *
 175  * @head:   Pointer to "struct tomoyo_io_buffer".
 176  *
 177  * Returns true if all data was flushed, false otherwise.
 178  */
 179 static bool tomoyo_flush(struct tomoyo_io_buffer *head)
 180 {
 181         while (head->r.w_pos) {
 182                 const char *w = head->r.w[0];
 183                 size_t len = strlen(w);
 184                 if (len) {
 185                         if (len > head->read_user_buf_avail)
 186                                 len = head->read_user_buf_avail;
 187                         if (!len)
 188                                 return false;
 189                         if (copy_to_user(head->read_user_buf, w, len))
 190                                 return false;
 191                         head->read_user_buf_avail -= len;
 192                         head->read_user_buf += len;
 193                         w += len;
 194                 }
 195                 head->r.w[0] = w;
 196                 if (*w)
 197                         return false;
 198                 /* Add '\0' for audit logs and query. */
 199                 if (head->poll) {
 200                         if (!head->read_user_buf_avail ||
 201                             copy_to_user(head->read_user_buf, "", 1))
 202                                 return false;
 203                         head->read_user_buf_avail--;
 204                         head->read_user_buf++;
 205                 }
 206                 head->r.w_pos--;
 207                 for (len = 0; len < head->r.w_pos; len++)
 208                         head->r.w[len] = head->r.w[len + 1];
 209         }
 210         head->r.avail = 0;
 211         return true;
 212 }
 213
 214 /**
 215  * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
 216  *
 217  * @head:   Pointer to "struct tomoyo_io_buffer".
 218  * @string: String to print.
 219  *
 220  * Note that @string has to be kept valid until @head is kfree()d.
 221  * This means that char[] allocated on stack memory cannot be passed to
 222  * this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
 223  */
 224 static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string)
 225 {
 226         if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) {
 227                 head->r.w[head->r.w_pos++] = string;
 228                 tomoyo_flush(head);
 229         } else
 230                 WARN_ON(1);
 231 }
 232
 233 /**
 234  * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
 235  *
 236  * @head: Pointer to "struct tomoyo_io_buffer".
 237  * @fmt:  The printf()'s format string, followed by parameters.
 238  */
 239 void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
 240 {
 241         va_list args;
 242         size_t len;
 243         size_t pos = head->r.avail;
 244         int size = head->readbuf_size - pos;
 245         if (size <= 0)
 246                 return;
 247         va_start(args, fmt);
 248         len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
 249         va_end(args);
 250         if (pos + len >= head->readbuf_size) {
 251                 WARN_ON(1);
 252                 return;
 253         }
 254         head->r.avail += len;
 255         tomoyo_set_string(head, head->read_buf + pos);
 256 }
 257
 258 /**
 259  * tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure.
 260  *
 261  * @head: Pointer to "struct tomoyo_io_buffer".
 262  *
 263  * Returns nothing.
 264  */
 265 static void tomoyo_set_space(struct tomoyo_io_buffer *head)
 266 {
 267         tomoyo_set_string(head, " ");
 268 }
 269
 270 /**
 271  * tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure.
 272  *
 273  * @head: Pointer to "struct tomoyo_io_buffer".
 274  *
 275  * Returns nothing.
 276  */
 277 static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
 278 {
 279         tomoyo_set_string(head, "\n");
 280         return !head->r.w_pos;
 281 }
 282
 283 /**
 284  * tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure.
 285  *
 286  * @head: Pointer to "struct tomoyo_io_buffer".
 287  *
 288  * Returns nothing.
 289  */
 290 static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
 291 {
 292         tomoyo_set_string(head, "/");
 293 }
 294
 295 /* List of namespaces. */
 296 LIST_HEAD(tomoyo_namespace_list);
 297 /* True if namespace other than tomoyo_kernel_namespace is defined. */
 298 static bool tomoyo_namespace_enabled;
 299
 300 /**
 301  * tomoyo_init_policy_namespace - Initialize namespace.
 302  *
 303  * @ns: Pointer to "struct tomoyo_policy_namespace".
 304  *
 305  * Returns nothing.
 306  */
 307 void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns)
 308 {
 309         unsigned int idx;
 310         for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++)
 311                 INIT_LIST_HEAD(&ns->acl_group[idx]);
 312         for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++)
 313                 INIT_LIST_HEAD(&ns->group_list[idx]);
 314         for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++)
 315                 INIT_LIST_HEAD(&ns->policy_list[idx]);
 316         ns->profile_version = 20100903;
 317         tomoyo_namespace_enabled = !list_empty(&tomoyo_namespace_list);
 318         list_add_tail_rcu(&ns->namespace_list, &tomoyo_namespace_list);
 319 }
 320
 321 /**
 322  * tomoyo_print_namespace - Print namespace header.
 323  *
 324  * @head: Pointer to "struct tomoyo_io_buffer".
 325  *
 326  * Returns nothing.
 327  */
 328 static void tomoyo_print_namespace(struct tomoyo_io_buffer *head)
 329 {
 330         if (!tomoyo_namespace_enabled)
 331                 return;
 332         tomoyo_set_string(head,
 333                           container_of(head->r.ns,
 334                                        struct tomoyo_policy_namespace,
 335                                        namespace_list)->name);
 336         tomoyo_set_space(head);
 337 }
 338
 339 /**
 340  * tomoyo_print_name_union - Print a tomoyo_name_union.
 341  *
 342  * @head: Pointer to "struct tomoyo_io_buffer".
 343  * @ptr:  Pointer to "struct tomoyo_name_union".
 344  */
 345 static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
 346                                     const struct tomoyo_name_union *ptr)
 347 {
 348         tomoyo_set_space(head);
 349         if (ptr->group) {
 350                 tomoyo_set_string(head, "@");
 351                 tomoyo_set_string(head, ptr->group->group_name->name);
 352         } else {
 353                 tomoyo_set_string(head, ptr->filename->name);
 354         }
 355 }
 356
 357 /**
 358  * tomoyo_print_name_union_quoted - Print a tomoyo_name_union with a quote.
 359  *
 360  * @head: Pointer to "struct tomoyo_io_buffer".
 361  * @ptr:  Pointer to "struct tomoyo_name_union".
 362  *
 363  * Returns nothing.
 364  */
 365 static void tomoyo_print_name_union_quoted(struct tomoyo_io_buffer *head,
 366                                            const struct tomoyo_name_union *ptr)
 367 {
 368         if (ptr->group) {
 369                 tomoyo_set_string(head, "@");
 370                 tomoyo_set_string(head, ptr->group->group_name->name);
 371         } else {
 372                 tomoyo_set_string(head, "\"");
 373                 tomoyo_set_string(head, ptr->filename->name);
 374                 tomoyo_set_string(head, "\"");
 375         }
 376 }
 377
 378 /**
 379  * tomoyo_print_number_union_nospace - Print a tomoyo_number_union without a space.
 380  *
 381  * @head: Pointer to "struct tomoyo_io_buffer".
 382  * @ptr:  Pointer to "struct tomoyo_number_union".
 383  *
 384  * Returns nothing.
 385  */
 386 static void tomoyo_print_number_union_nospace
 387 (struct tomoyo_io_buffer *head, const struct tomoyo_number_union *ptr)
 388 {
 389         if (ptr->group) {
 390                 tomoyo_set_string(head, "@");
 391                 tomoyo_set_string(head, ptr->group->group_name->name);
 392         } else {
 393                 int i;
 394                 unsigned long min = ptr->values[0];
 395                 const unsigned long max = ptr->values[1];
 396                 u8 min_type = ptr->value_type[0];
 397                 const u8 max_type = ptr->value_type[1];
 398                 char buffer[128];
 399                 buffer[0] = '\0';
 400                 for (i = 0; i < 2; i++) {
 401                         switch (min_type) {
 402                         case TOMOYO_VALUE_TYPE_HEXADECIMAL:
 403                                 tomoyo_addprintf(buffer, sizeof(buffer),
 404                                                  "0x%lX", min);
 405                                 break;
 406                         case TOMOYO_VALUE_TYPE_OCTAL:
 407                                 tomoyo_addprintf(buffer, sizeof(buffer),
 408                                                  "0%lo", min);
 409                                 break;
 410                         default:
 411                                 tomoyo_addprintf(buffer, sizeof(buffer), "%lu",
 412                                                  min);
 413                                 break;
 414                         }
 415                         if (min == max && min_type == max_type)
 416                                 break;
 417                         tomoyo_addprintf(buffer, sizeof(buffer), "-");
 418                         min_type = max_type;
 419                         min = max;
 420                 }
 421                 tomoyo_io_printf(head, "%s", buffer);
 422         }
 423 }
 424
 425 /**
 426  * tomoyo_print_number_union - Print a tomoyo_number_union.
 427  *
 428  * @head: Pointer to "struct tomoyo_io_buffer".
 429  * @ptr:  Pointer to "struct tomoyo_number_union".
 430  *
 431  * Returns nothing.
 432  */
 433 static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
 434                                       const struct tomoyo_number_union *ptr)
 435 {
 436         tomoyo_set_space(head);
 437         tomoyo_print_number_union_nospace(head, ptr);
 438 }
 439
 440 /**
 441  * tomoyo_assign_profile - Create a new profile.
 442  *
 443  * @ns:      Pointer to "struct tomoyo_policy_namespace".
 444  * @profile: Profile number to create.
 445  *
 446  * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
 447  */
 448 static struct tomoyo_profile *tomoyo_assign_profile
 449 (struct tomoyo_policy_namespace *ns, const unsigned int profile)
 450 {
 451         struct tomoyo_profile *ptr;
 452         struct tomoyo_profile *entry;
 453         if (profile >= TOMOYO_MAX_PROFILES)
 454                 return NULL;
 455         ptr = ns->profile_ptr[profile];
 456         if (ptr)
 457                 return ptr;
 458         entry = kzalloc(sizeof(*entry), GFP_NOFS);
 459         if (mutex_lock_interruptible(&tomoyo_policy_lock))
 460                 goto out;
 461         ptr = ns->profile_ptr[profile];
 462         if (!ptr && tomoyo_memory_ok(entry)) {
 463                 ptr = entry;
 464                 ptr->default_config = TOMOYO_CONFIG_DISABLED |
 465                         TOMOYO_CONFIG_WANT_GRANT_LOG |
 466                         TOMOYO_CONFIG_WANT_REJECT_LOG;
 467                 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
 468                        sizeof(ptr->config));
 469                 ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] = 1024;
 470                 ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] = 2048;
 471                 mb(); /* Avoid out-of-order execution. */
 472                 ns->profile_ptr[profile] = ptr;
 473                 entry = NULL;
 474         }
 475         mutex_unlock(&tomoyo_policy_lock);
 476  out:
 477         kfree(entry);
 478         return ptr;
 479 }
 480
 481 /**
 482  * tomoyo_profile - Find a profile.
 483  *
 484  * @ns:      Pointer to "struct tomoyo_policy_namespace".
 485  * @profile: Profile number to find.
 486  *
 487  * Returns pointer to "struct tomoyo_profile".
 488  */
 489 struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns,
 490                                       const u8 profile)
 491 {
 492         static struct tomoyo_profile tomoyo_null_profile;
 493         struct tomoyo_profile *ptr = ns->profile_ptr[profile];
 494         if (!ptr)
 495                 ptr = &tomoyo_null_profile;
 496         return ptr;
 497 }
 498
 499 /**
 500  * tomoyo_find_yesno - Find values for specified keyword.
 501  *
 502  * @string: String to check.
 503  * @find:   Name of keyword.
 504  *
 505  * Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise.
 506  */
 507 static s8 tomoyo_find_yesno(const char *string, const char *find)
 508 {
 509         const char *cp = strstr(string, find);
 510         if (cp) {
 511                 cp += strlen(find);
 512                 if (!strncmp(cp, "=yes", 4))
 513                         return 1;
 514                 else if (!strncmp(cp, "=no", 3))
 515                         return 0;
 516         }
 517         return -1;
 518 }
 519
 520 /**
 521  * tomoyo_set_uint - Set value for specified preference.
 522  *
 523  * @i:      Pointer to "unsigned int".
 524  * @string: String to check.
 525  * @find:   Name of keyword.
 526  *
 527  * Returns nothing.
 528  */
 529 static void tomoyo_set_uint(unsigned int *i, const char *string,
 530                             const char *find)
 531 {
 532         const char *cp = strstr(string, find);
 533         if (cp)
 534                 sscanf(cp + strlen(find), "=%u", i);
 535 }
 536
 537 /**
 538  * tomoyo_set_mode - Set mode for specified profile.
 539  *
 540  * @name:    Name of functionality.
 541  * @value:   Mode for @name.
 542  * @profile: Pointer to "struct tomoyo_profile".
 543  *
 544  * Returns 0 on success, negative value otherwise.
 545  */
 546 static int tomoyo_set_mode(char *name, const char *value,
 547                            struct tomoyo_profile *profile)
 548 {
 549         u8 i;
 550         u8 config;
 551         if (!strcmp(name, "CONFIG")) {
 552                 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
 553                 config = profile->default_config;
 554         } else if (tomoyo_str_starts(&name, "CONFIG::")) {
 555                 config = 0;
 556                 for (i = 0; i < TOMOYO_MAX_MAC_INDEX
 557                              + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
 558                         int len = 0;
 559                         if (i < TOMOYO_MAX_MAC_INDEX) {
 560                                 const u8 c = tomoyo_index2category[i];
 561                                 const char *category =
 562                                         tomoyo_category_keywords[c];
 563                                 len = strlen(category);
 564                                 if (strncmp(name, category, len) ||
 565                                     name[len++] != ':' || name[len++] != ':')
 566                                         continue;
 567                         }
 568                         if (strcmp(name + len, tomoyo_mac_keywords[i]))
 569                                 continue;
 570                         config = profile->config[i];
 571                         break;
 572                 }
 573                 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
 574                         return -EINVAL;
 575         } else {
 576                 return -EINVAL;
 577         }
 578         if (strstr(value, "use_default")) {
 579                 config = TOMOYO_CONFIG_USE_DEFAULT;
 580         } else {
 581                 u8 mode;
 582                 for (mode = 0; mode < 4; mode++)
 583                         if (strstr(value, tomoyo_mode[mode]))
 584                                 /*
 585                                  * Update lower 3 bits in order to distinguish
 586                                  * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
 587                                  */
 588                                 config = (config & ~7) | mode;
 589                 if (config != TOMOYO_CONFIG_USE_DEFAULT) {
 590                         switch (tomoyo_find_yesno(value, "grant_log")) {
 591                         case 1:
 592                                 config |= TOMOYO_CONFIG_WANT_GRANT_LOG;
 593                                 break;
 594                         case 0:
 595                                 config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG;
 596                                 break;
 597                         }
 598                         switch (tomoyo_find_yesno(value, "reject_log")) {
 599                         case 1:
 600                                 config |= TOMOYO_CONFIG_WANT_REJECT_LOG;
 601                                 break;
 602                         case 0:
 603                                 config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG;
 604                                 break;
 605                         }
 606                 }
 607         }
 608         if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
 609                 profile->config[i] = config;
 610         else if (config != TOMOYO_CONFIG_USE_DEFAULT)
 611                 profile->default_config = config;
 612         return 0;
 613 }
 614
 615 /**
 616  * tomoyo_write_profile - Write profile table.
 617  *
 618  * @head: Pointer to "struct tomoyo_io_buffer".
 619  *
 620  * Returns 0 on success, negative value otherwise.
 621  */
 622 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
 623 {
 624         char *data = head->write_buf;
 625         unsigned int i;
 626         char *cp;
 627         struct tomoyo_profile *profile;
 628         if (sscanf(data, "PROFILE_VERSION=%u", &head->w.ns->profile_version)
 629             == 1)
 630                 return 0;
 631         i = simple_strtoul(data, &cp, 10);
 632         if (*cp != '-')
 633                 return -EINVAL;
 634         data = cp + 1;
 635         profile = tomoyo_assign_profile(head->w.ns, i);
 636         if (!profile)
 637                 return -EINVAL;
 638         cp = strchr(data, '=');
 639         if (!cp)
 640                 return -EINVAL;
 641         *cp++ = '\0';
 642         if (!strcmp(data, "COMMENT")) {
 643                 static DEFINE_SPINLOCK(lock);
 644                 const struct tomoyo_path_info *new_comment
 645                         = tomoyo_get_name(cp);
 646                 const struct tomoyo_path_info *old_comment;
 647                 if (!new_comment)
 648                         return -ENOMEM;
 649                 spin_lock(&lock);
 650                 old_comment = profile->comment;
 651                 profile->comment = new_comment;
 652                 spin_unlock(&lock);
 653                 tomoyo_put_name(old_comment);
 654                 return 0;
 655         }
 656         if (!strcmp(data, "PREFERENCE")) {
 657                 for (i = 0; i < TOMOYO_MAX_PREF; i++)
 658                         tomoyo_set_uint(&profile->pref[i], cp,
 659                                         tomoyo_pref_keywords[i]);
 660                 return 0;
 661         }
 662         return tomoyo_set_mode(data, cp, profile);
 663 }
 664
 665 /**
 666  * tomoyo_print_config - Print mode for specified functionality.
 667  *
 668  * @head:   Pointer to "struct tomoyo_io_buffer".
 669  * @config: Mode for that functionality.
 670  *
 671  * Returns nothing.
 672  *
 673  * Caller prints functionality's name.
 674  */
 675 static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
 676 {
 677         tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n",
 678                          tomoyo_mode[config & 3],
 679                          tomoyo_yesno(config & TOMOYO_CONFIG_WANT_GRANT_LOG),
 680                          tomoyo_yesno(config & TOMOYO_CONFIG_WANT_REJECT_LOG));
 681 }
 682
 683 /**
 684  * tomoyo_read_profile - Read profile table.
 685  *
 686  * @head: Pointer to "struct tomoyo_io_buffer".
 687  *
 688  * Returns nothing.
 689  */
 690 static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
 691 {
 692         u8 index;
 693         struct tomoyo_policy_namespace *ns =
 694                 container_of(head->r.ns, typeof(*ns), namespace_list);
 695         const struct tomoyo_profile *profile;
 696         if (head->r.eof)
 697                 return;
 698  next:
 699         index = head->r.index;
 700         profile = ns->profile_ptr[index];
 701         switch (head->r.step) {
 702         case 0:
 703                 tomoyo_print_namespace(head);
 704                 tomoyo_io_printf(head, "PROFILE_VERSION=%u\n",
 705                                  ns->profile_version);
 706                 head->r.step++;
 707                 break;
 708         case 1:
 709                 for ( ; head->r.index < TOMOYO_MAX_PROFILES;
 710                       head->r.index++)
 711                         if (ns->profile_ptr[head->r.index])
 712                                 break;
 713                 if (head->r.index == TOMOYO_MAX_PROFILES) {
 714                         head->r.eof = true;
 715                         return;
 716                 }
 717                 head->r.step++;
 718                 break;
 719         case 2:
 720                 {
 721                         u8 i;
 722                         const struct tomoyo_path_info *comment =
 723                                 profile->comment;
 724                         tomoyo_print_namespace(head);
 725                         tomoyo_io_printf(head, "%u-COMMENT=", index);
 726                         tomoyo_set_string(head, comment ? comment->name : "");
 727                         tomoyo_set_lf(head);
 728                         tomoyo_print_namespace(head);
 729                         tomoyo_io_printf(head, "%u-PREFERENCE={ ", index);
 730                         for (i = 0; i < TOMOYO_MAX_PREF; i++)
 731                                 tomoyo_io_printf(head, "%s=%u ",
 732                                                  tomoyo_pref_keywords[i],
 733                                                  profile->pref[i]);
 734                         tomoyo_set_string(head, "}\n");
 735                         head->r.step++;
 736                 }
 737                 break;
 738         case 3:
 739                 {
 740                         tomoyo_print_namespace(head);
 741                         tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
 742                         tomoyo_print_config(head, profile->default_config);
 743                         head->r.bit = 0;
 744                         head->r.step++;
 745                 }
 746                 break;
 747         case 4:
 748                 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
 749                               + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
 750                         const u8 i = head->r.bit;
 751                         const u8 config = profile->config[i];
 752                         if (config == TOMOYO_CONFIG_USE_DEFAULT)
 753                                 continue;
 754                         tomoyo_print_namespace(head);
 755                         if (i < TOMOYO_MAX_MAC_INDEX)
 756                                 tomoyo_io_printf(head, "%u-CONFIG::%s::%s",
 757                                                  index,
 758                                                  tomoyo_category_keywords
 759                                                  [tomoyo_index2category[i]],
 760                                                  tomoyo_mac_keywords[i]);
 761                         else
 762                                 tomoyo_io_printf(head, "%u-CONFIG::%s", index,
 763                                                  tomoyo_mac_keywords[i]);
 764                         tomoyo_print_config(head, config);
 765                         head->r.bit++;
 766                         break;
 767                 }
 768                 if (head->r.bit == TOMOYO_MAX_MAC_INDEX
 769                     + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
 770                         head->r.index++;
 771                         head->r.step = 1;
 772                 }
 773                 break;
 774         }
 775         if (tomoyo_flush(head))
 776                 goto next;
 777 }
 778
 779 /**
 780  * tomoyo_same_manager - Check for duplicated "struct tomoyo_manager" entry.
 781  *
 782  * @a: Pointer to "struct tomoyo_acl_head".
 783  * @b: Pointer to "struct tomoyo_acl_head".
 784  *
 785  * Returns true if @a == @b, false otherwise.
 786  */
 787 static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
 788                                 const struct tomoyo_acl_head *b)
 789 {
 790         return container_of(a, struct tomoyo_manager, head)->manager ==
 791                 container_of(b, struct tomoyo_manager, head)->manager;
 792 }
 793
 794 /**
 795  * tomoyo_update_manager_entry - Add a manager entry.
 796  *
 797  * @manager:   The path to manager or the domainnamme.
 798  * @is_delete: True if it is a delete request.
 799  *
 800  * Returns 0 on success, negative value otherwise.
 801  *
 802  * Caller holds tomoyo_read_lock().
 803  */
 804 static int tomoyo_update_manager_entry(const char *manager,
 805                                        const bool is_delete)
 806 {
 807         struct tomoyo_manager e = { };
 808         struct tomoyo_acl_param param = {
 809                 /* .ns = &tomoyo_kernel_namespace, */
 810                 .is_delete = is_delete,
 811                 .list = &tomoyo_kernel_namespace.
 812                 policy_list[TOMOYO_ID_MANAGER],
 813         };
 814         int error = is_delete ? -ENOENT : -ENOMEM;
 815         if (tomoyo_domain_def(manager)) {
 816                 if (!tomoyo_correct_domain(manager))
 817                         return -EINVAL;
 818                 e.is_domain = true;
 819         } else {
 820                 if (!tomoyo_correct_path(manager))
 821                         return -EINVAL;
 822         }
 823         e.manager = tomoyo_get_name(manager);
 824         if (e.manager) {
 825                 error = tomoyo_update_policy(&e.head, sizeof(e), &param,
 826                                              tomoyo_same_manager);
 827                 tomoyo_put_name(e.manager);
 828         }
 829         return error;
 830 }
 831
 832 /**
 833  * tomoyo_write_manager - Write manager policy.
 834  *
 835  * @head: Pointer to "struct tomoyo_io_buffer".
 836  *
 837  * Returns 0 on success, negative value otherwise.
 838  *
 839  * Caller holds tomoyo_read_lock().
 840  */
 841 static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
 842 {
 843         char *data = head->write_buf;
 844
 845         if (!strcmp(data, "manage_by_non_root")) {
 846                 tomoyo_manage_by_non_root = !head->w.is_delete;
 847                 return 0;
 848         }
 849         return tomoyo_update_manager_entry(data, head->w.is_delete);
 850 }
 851
 852 /**
 853  * tomoyo_read_manager - Read manager policy.
 854  *
 855  * @head: Pointer to "struct tomoyo_io_buffer".
 856  *
 857  * Caller holds tomoyo_read_lock().
 858  */
 859 static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
 860 {
 861         if (head->r.eof)
 862                 return;
 863         list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.
 864                              policy_list[TOMOYO_ID_MANAGER]) {
 865                 struct tomoyo_manager *ptr =
 866                         list_entry(head->r.acl, typeof(*ptr), head.list);
 867                 if (ptr->head.is_deleted)
 868                         continue;
 869                 if (!tomoyo_flush(head))
 870                         return;
 871                 tomoyo_set_string(head, ptr->manager->name);
 872                 tomoyo_set_lf(head);
 873         }
 874         head->r.eof = true;
 875 }
 876
 877 /**
 878  * tomoyo_manager - Check whether the current process is a policy manager.
 879  *
 880  * Returns true if the current process is permitted to modify policy
 881  * via /sys/kernel/security/tomoyo/ interface.
 882  *
 883  * Caller holds tomoyo_read_lock().
 884  */
 885 static bool tomoyo_manager(void)
 886 {
 887         struct tomoyo_manager *ptr;
 888         const char *exe;
 889         const struct task_struct *task = current;
 890         const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
 891         bool found = false;
 892
 893         if (!tomoyo_policy_loaded)
 894                 return true;
 895         if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
 896                 return false;
 897         list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
 898                                 policy_list[TOMOYO_ID_MANAGER], head.list) {
 899                 if (!ptr->head.is_deleted && ptr->is_domain
 900                     && !tomoyo_pathcmp(domainname, ptr->manager)) {
 901                         found = true;
 902                         break;
 903                 }
 904         }
 905         if (found)
 906                 return true;
 907         exe = tomoyo_get_exe();
 908         if (!exe)
 909                 return false;
 910         list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
 911                                 policy_list[TOMOYO_ID_MANAGER], head.list) {
 912                 if (!ptr->head.is_deleted && !ptr->is_domain
 913                     && !strcmp(exe, ptr->manager->name)) {
 914                         found = true;
 915                         break;
 916                 }
 917         }
 918         if (!found) { /* Reduce error messages. */
 919                 static pid_t last_pid;
 920                 const pid_t pid = current->pid;
 921                 if (last_pid != pid) {
 922                         printk(KERN_WARNING "%s ( %s ) is not permitted to "
 923                                "update policies.\n", domainname->name, exe);
 924                         last_pid = pid;
 925                 }
 926         }
 927         kfree(exe);
 928         return found;
 929 }
 930
 931 /**
 932  * tomoyo_select_domain - Parse select command.
 933  *
 934  * @head: Pointer to "struct tomoyo_io_buffer".
 935  * @data: String to parse.
 936  *
 937  * Returns true on success, false otherwise.
 938  *
 939  * Caller holds tomoyo_read_lock().
 940  */
 941 static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
 942                                  const char *data)
 943 {
 944         unsigned int pid;
 945         struct tomoyo_domain_info *domain = NULL;
 946         bool global_pid = false;
 947         if (strncmp(data, "select ", 7))
 948                 return false;
 949         data += 7;
 950         if (sscanf(data, "pid=%u", &pid) == 1 ||
 951             (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
 952                 struct task_struct *p;
 953                 rcu_read_lock();
 954                 read_lock(&tasklist_lock);
 955                 if (global_pid)
 956                         p = find_task_by_pid_ns(pid, &init_pid_ns);
 957                 else
 958                         p = find_task_by_vpid(pid);
 959                 if (p)
 960                         domain = tomoyo_real_domain(p);
 961                 read_unlock(&tasklist_lock);
 962                 rcu_read_unlock();
 963         } else if (!strncmp(data, "domain=", 7)) {
 964                 if (tomoyo_domain_def(data + 7))
 965                         domain = tomoyo_find_domain(data + 7);
 966         } else
 967                 return false;
 968         head->w.domain = domain;
 969         /* Accessing read_buf is safe because head->io_sem is held. */
 970         if (!head->read_buf)
 971                 return true; /* Do nothing if open(O_WRONLY). */
 972         memset(&head->r, 0, sizeof(head->r));
 973         head->r.print_this_domain_only = true;
 974         if (domain)
 975                 head->r.domain = &domain->list;
 976         else
 977                 head->r.eof = 1;
 978         tomoyo_io_printf(head, "# select %s\n", data);
 979         if (domain && domain->is_deleted)
 980                 tomoyo_io_printf(head, "# This is a deleted domain.\n");
 981         return true;
 982 }
 983
 984 /**
 985  * tomoyo_delete_domain - Delete a domain.
 986  *
 987  * @domainname: The name of domain.
 988  *
 989  * Returns 0.
 990  *
 991  * Caller holds tomoyo_read_lock().
 992  */
 993 static int tomoyo_delete_domain(char *domainname)
 994 {
 995         struct tomoyo_domain_info *domain;
 996         struct tomoyo_path_info name;
 997
 998         name.name = domainname;
 999         tomoyo_fill_path_info(&name);
1000         if (mutex_lock_interruptible(&tomoyo_policy_lock))
1001                 return 0;
1002         /* Is there an active domain? */
1003         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1004                 /* Never delete tomoyo_kernel_domain */
1005                 if (domain == &tomoyo_kernel_domain)
1006                         continue;
1007                 if (domain->is_deleted ||
1008                     tomoyo_pathcmp(domain->domainname, &name))
1009                         continue;
1010                 domain->is_deleted = true;
1011                 break;
1012         }
1013         mutex_unlock(&tomoyo_policy_lock);
1014         return 0;
1015 }
1016
1017 /**
1018  * tomoyo_write_domain2 - Write domain policy.
1019  *
1020  * @ns:        Pointer to "struct tomoyo_policy_namespace".
1021  * @list:      Pointer to "struct list_head".
1022  * @data:      Policy to be interpreted.
1023  * @is_delete: True if it is a delete request.
1024  *
1025  * Returns 0 on success, negative value otherwise.
1026  *
1027  * Caller holds tomoyo_read_lock().
1028  */
1029 static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
1030                                 struct list_head *list, char *data,
1031                                 const bool is_delete)
1032 {
1033         struct tomoyo_acl_param param = {
1034                 .ns = ns,
1035                 .list = list,
1036                 .data = data,
1037                 .is_delete = is_delete,
1038         };
1039         static const struct {
1040                 const char *keyword;
1041                 int (*write) (struct tomoyo_acl_param *);
1042         } tomoyo_callback[1] = {
1043                 { "file ", tomoyo_write_file },
1044         };
1045         u8 i;
1046         for (i = 0; i < 1; i++) {
1047                 if (!tomoyo_str_starts(&param.data,
1048                                        tomoyo_callback[i].keyword))
1049                         continue;
1050                 return tomoyo_callback[i].write(&param);
1051         }
1052         return -EINVAL;
1053 }
1054
1055 /* String table for domain flags. */
1056 const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1057         [TOMOYO_DIF_QUOTA_WARNED]      = "quota_exceeded\n",
1058         [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1059 };
1060
1061 /**
1062  * tomoyo_write_domain - Write domain policy.
1063  *
1064  * @head: Pointer to "struct tomoyo_io_buffer".
1065  *
1066  * Returns 0 on success, negative value otherwise.
1067  *
1068  * Caller holds tomoyo_read_lock().
1069  */
1070 static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1071 {
1072         char *data = head->write_buf;
1073         struct tomoyo_policy_namespace *ns;
1074         struct tomoyo_domain_info *domain = head->w.domain;
1075         const bool is_delete = head->w.is_delete;
1076         bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1077         unsigned int profile;
1078         if (*data == '<') {
1079                 domain = NULL;
1080                 if (is_delete)
1081                         tomoyo_delete_domain(data);
1082                 else if (is_select)
1083                         domain = tomoyo_find_domain(data);
1084                 else
1085                         domain = tomoyo_assign_domain(data, false);
1086                 head->w.domain = domain;
1087                 return 0;
1088         }
1089         if (!domain)
1090                 return -EINVAL;
1091         ns = domain->ns;
1092         if (sscanf(data, "use_profile %u", &profile) == 1
1093             && profile < TOMOYO_MAX_PROFILES) {
1094                 if (!tomoyo_policy_loaded || ns->profile_ptr[profile])
1095                         domain->profile = (u8) profile;
1096                 return 0;
1097         }
1098         if (sscanf(data, "use_group %u\n", &profile) == 1
1099             && profile < TOMOYO_MAX_ACL_GROUPS) {
1100                 if (!is_delete)
1101                         domain->group = (u8) profile;
1102                 return 0;
1103         }
1104         for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) {
1105                 const char *cp = tomoyo_dif[profile];
1106                 if (strncmp(data, cp, strlen(cp) - 1))
1107                         continue;
1108                 domain->flags[profile] = !is_delete;
1109                 return 0;
1110         }
1111         return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1112                                     is_delete);
1113 }
1114
1115 /**
1116  * tomoyo_print_condition - Print condition part.
1117  *
1118  * @head: Pointer to "struct tomoyo_io_buffer".
1119  * @cond: Pointer to "struct tomoyo_condition".
1120  *
1121  * Returns true on success, false otherwise.
1122  */
1123 static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1124                                    const struct tomoyo_condition *cond)
1125 {
1126         switch (head->r.cond_step) {
1127         case 0:
1128                 head->r.cond_index = 0;
1129                 head->r.cond_step++;
1130                 /* fall through */
1131         case 1:
1132                 {
1133                         const u16 condc = cond->condc;
1134                         const struct tomoyo_condition_element *condp =
1135                                 (typeof(condp)) (cond + 1);
1136                         const struct tomoyo_number_union *numbers_p =
1137                                 (typeof(numbers_p)) (condp + condc);
1138                         const struct tomoyo_name_union *names_p =
1139                                 (typeof(names_p))
1140                                 (numbers_p + cond->numbers_count);
1141                         const struct tomoyo_argv *argv =
1142                                 (typeof(argv)) (names_p + cond->names_count);
1143                         const struct tomoyo_envp *envp =
1144                                 (typeof(envp)) (argv + cond->argc);
1145                         u16 skip;
1146                         for (skip = 0; skip < head->r.cond_index; skip++) {
1147                                 const u8 left = condp->left;
1148                                 const u8 right = condp->right;
1149                                 condp++;
1150                                 switch (left) {
1151                                 case TOMOYO_ARGV_ENTRY:
1152                                         argv++;
1153                                         continue;
1154                                 case TOMOYO_ENVP_ENTRY:
1155                                         envp++;
1156                                         continue;
1157                                 case TOMOYO_NUMBER_UNION:
1158                                         numbers_p++;
1159                                         break;
1160                                 }
1161                                 switch (right) {
1162                                 case TOMOYO_NAME_UNION:
1163                                         names_p++;
1164                                         break;
1165                                 case TOMOYO_NUMBER_UNION:
1166                                         numbers_p++;
1167                                         break;
1168                                 }
1169                         }
1170                         while (head->r.cond_index < condc) {
1171                                 const u8 match = condp->equals;
1172                                 const u8 left = condp->left;
1173                                 const u8 right = condp->right;
1174                                 if (!tomoyo_flush(head))
1175                                         return false;
1176                                 condp++;
1177                                 head->r.cond_index++;
1178                                 tomoyo_set_space(head);
1179                                 switch (left) {
1180                                 case TOMOYO_ARGV_ENTRY:
1181                                         tomoyo_io_printf(head,
1182                                                          "exec.argv[%lu]%s=\"",
1183                                                          argv->index, argv->
1184                                                          is_not ? "!" : "");
1185                                         tomoyo_set_string(head,
1186                                                           argv->value->name);
1187                                         tomoyo_set_string(head, "\"");
1188                                         argv++;
1189                                         continue;
1190                                 case TOMOYO_ENVP_ENTRY:
1191                                         tomoyo_set_string(head,
1192                                                           "exec.envp[\"");
1193                                         tomoyo_set_string(head,
1194                                                           envp->name->name);
1195                                         tomoyo_io_printf(head, "\"]%s=", envp->
1196                                                          is_not ? "!" : "");
1197                                         if (envp->value) {
1198                                                 tomoyo_set_string(head, "\"");
1199                                                 tomoyo_set_string(head, envp->
1200                                                                   value->name);
1201                                                 tomoyo_set_string(head, "\"");
1202                                         } else {
1203                                                 tomoyo_set_string(head,
1204                                                                   "NULL");
1205                                         }
1206                                         envp++;
1207                                         continue;
1208                                 case TOMOYO_NUMBER_UNION:
1209                                         tomoyo_print_number_union_nospace
1210                                                 (head, numbers_p++);
1211                                         break;
1212                                 default:
1213                                         tomoyo_set_string(head,
1214                                                tomoyo_condition_keyword[left]);
1215                                         break;
1216                                 }
1217                                 tomoyo_set_string(head, match ? "=" : "!=");
1218                                 switch (right) {
1219                                 case TOMOYO_NAME_UNION:
1220                                         tomoyo_print_name_union_quoted
1221                                                 (head, names_p++);
1222                                         break;
1223                                 case TOMOYO_NUMBER_UNION:
1224                                         tomoyo_print_number_union_nospace
1225                                                 (head, numbers_p++);
1226                                         break;
1227                                 default:
1228                                         tomoyo_set_string(head,
1229                                           tomoyo_condition_keyword[right]);
1230                                         break;
1231                                 }
1232                         }
1233                 }
1234                 head->r.cond_step++;
1235                 /* fall through */
1236         case 2:
1237                 if (!tomoyo_flush(head))
1238                         break;
1239                 head->r.cond_step++;
1240                 /* fall through */
1241         case 3:
1242                 tomoyo_set_lf(head);
1243                 return true;
1244         }
1245         return false;
1246 }
1247
1248 /**
1249  * tomoyo_set_group - Print "acl_group " header keyword and category name.
1250  *
1251  * @head:     Pointer to "struct tomoyo_io_buffer".
1252  * @category: Category name.
1253  *
1254  * Returns nothing.
1255  */
1256 static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1257                              const char *category)
1258 {
1259         if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1260                 tomoyo_print_namespace(head);
1261                 tomoyo_io_printf(head, "acl_group %u ",
1262                                  head->r.acl_group_index);
1263         }
1264         tomoyo_set_string(head, category);
1265 }
1266
1267 /**
1268  * tomoyo_print_entry - Print an ACL entry.
1269  *
1270  * @head: Pointer to "struct tomoyo_io_buffer".
1271  * @acl:  Pointer to an ACL entry.
1272  *
1273  * Returns true on success, false otherwise.
1274  */
1275 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1276                                struct tomoyo_acl_info *acl)
1277 {
1278         const u8 acl_type = acl->type;
1279         bool first = true;
1280         u8 bit;
1281
1282         if (head->r.print_cond_part)
1283                 goto print_cond_part;
1284         if (acl->is_deleted)
1285                 return true;
1286         if (!tomoyo_flush(head))
1287                 return false;
1288         else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1289                 struct tomoyo_path_acl *ptr =
1290                         container_of(acl, typeof(*ptr), head);
1291                 const u16 perm = ptr->perm;
1292                 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1293                         if (!(perm & (1 << bit)))
1294                                 continue;
1295                         if (head->r.print_transition_related_only &&
1296                             bit != TOMOYO_TYPE_EXECUTE)
1297                                 continue;
1298                         if (first) {
1299                                 tomoyo_set_group(head, "file ");
1300                                 first = false;
1301                         } else {
1302                                 tomoyo_set_slash(head);
1303                         }
1304                         tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1305                 }
1306                 if (first)
1307                         return true;
1308                 tomoyo_print_name_union(head, &ptr->name);
1309         } else if (head->r.print_transition_related_only) {
1310                 return true;
1311         } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1312                 struct tomoyo_path2_acl *ptr =
1313                         container_of(acl, typeof(*ptr), head);
1314                 const u8 perm = ptr->perm;
1315                 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1316                         if (!(perm & (1 << bit)))
1317                                 continue;
1318                         if (first) {
1319                                 tomoyo_set_group(head, "file ");
1320                                 first = false;
1321                         } else {
1322                                 tomoyo_set_slash(head);
1323                         }
1324                         tomoyo_set_string(head, tomoyo_mac_keywords
1325                                           [tomoyo_pp2mac[bit]]);
1326                 }
1327                 if (first)
1328                         return true;
1329                 tomoyo_print_name_union(head, &ptr->name1);
1330                 tomoyo_print_name_union(head, &ptr->name2);
1331         } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1332                 struct tomoyo_path_number_acl *ptr =
1333                         container_of(acl, typeof(*ptr), head);
1334                 const u8 perm = ptr->perm;
1335                 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1336                         if (!(perm & (1 << bit)))
1337                                 continue;
1338                         if (first) {
1339                                 tomoyo_set_group(head, "file ");
1340                                 first = false;
1341                         } else {
1342                                 tomoyo_set_slash(head);
1343                         }
1344                         tomoyo_set_string(head, tomoyo_mac_keywords
1345                                           [tomoyo_pn2mac[bit]]);
1346                 }
1347                 if (first)
1348                         return true;
1349                 tomoyo_print_name_union(head, &ptr->name);
1350                 tomoyo_print_number_union(head, &ptr->number);
1351         } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1352                 struct tomoyo_mkdev_acl *ptr =
1353                         container_of(acl, typeof(*ptr), head);
1354                 const u8 perm = ptr->perm;
1355                 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1356                         if (!(perm & (1 << bit)))
1357                                 continue;
1358                         if (first) {
1359                                 tomoyo_set_group(head, "file ");
1360                                 first = false;
1361                         } else {
1362                                 tomoyo_set_slash(head);
1363                         }
1364                         tomoyo_set_string(head, tomoyo_mac_keywords
1365                                           [tomoyo_pnnn2mac[bit]]);
1366                 }
1367                 if (first)
1368                         return true;
1369                 tomoyo_print_name_union(head, &ptr->name);
1370                 tomoyo_print_number_union(head, &ptr->mode);
1371                 tomoyo_print_number_union(head, &ptr->major);
1372                 tomoyo_print_number_union(head, &ptr->minor);
1373         } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1374                 struct tomoyo_mount_acl *ptr =
1375                         container_of(acl, typeof(*ptr), head);
1376                 tomoyo_set_group(head, "file mount");
1377                 tomoyo_print_name_union(head, &ptr->dev_name);
1378                 tomoyo_print_name_union(head, &ptr->dir_name);
1379                 tomoyo_print_name_union(head, &ptr->fs_type);
1380                 tomoyo_print_number_union(head, &ptr->flags);
1381         }
1382         if (acl->cond) {
1383                 head->r.print_cond_part = true;
1384                 head->r.cond_step = 0;
1385                 if (!tomoyo_flush(head))
1386                         return false;
1387 print_cond_part:
1388                 if (!tomoyo_print_condition(head, acl->cond))
1389                         return false;
1390                 head->r.print_cond_part = false;
1391         } else {
1392                 tomoyo_set_lf(head);
1393         }
1394         return true;
1395 }
1396
1397 /**
1398  * tomoyo_read_domain2 - Read domain policy.
1399  *
1400  * @head: Pointer to "struct tomoyo_io_buffer".
1401  * @list: Pointer to "struct list_head".
1402  *
1403  * Caller holds tomoyo_read_lock().
1404  *
1405  * Returns true on success, false otherwise.
1406  */
1407 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1408                                 struct list_head *list)
1409 {
1410         list_for_each_cookie(head->r.acl, list) {
1411                 struct tomoyo_acl_info *ptr =
1412                         list_entry(head->r.acl, typeof(*ptr), list);
1413                 if (!tomoyo_print_entry(head, ptr))
1414                         return false;
1415         }
1416         head->r.acl = NULL;
1417         return true;
1418 }
1419
1420 /**
1421  * tomoyo_read_domain - Read domain policy.
1422  *
1423  * @head: Pointer to "struct tomoyo_io_buffer".
1424  *
1425  * Caller holds tomoyo_read_lock().
1426  */
1427 static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1428 {
1429         if (head->r.eof)
1430                 return;
1431         list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1432                 struct tomoyo_domain_info *domain =
1433                         list_entry(head->r.domain, typeof(*domain), list);
1434                 switch (head->r.step) {
1435                         u8 i;
1436                 case 0:
1437                         if (domain->is_deleted &&
1438                             !head->r.print_this_domain_only)
1439                                 continue;
1440                         /* Print domainname and flags. */
1441                         tomoyo_set_string(head, domain->domainname->name);
1442                         tomoyo_set_lf(head);
1443                         tomoyo_io_printf(head, "use_profile %u\n",
1444                                          domain->profile);
1445                         tomoyo_io_printf(head, "use_group %u\n",
1446                                          domain->group);
1447                         for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1448                                 if (domain->flags[i])
1449                                         tomoyo_set_string(head, tomoyo_dif[i]);
1450                         head->r.step++;
1451                         tomoyo_set_lf(head);
1452                         /* fall through */
1453                 case 1:
1454                         if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1455                                 return;
1456                         head->r.step++;
1457                         if (!tomoyo_set_lf(head))
1458                                 return;
1459                         /* fall through */
1460                 case 2:
1461                         head->r.step = 0;
1462                         if (head->r.print_this_domain_only)
1463                                 goto done;
1464                 }
1465         }
1466  done:
1467         head->r.eof = true;
1468 }
1469
1470 /**
1471  * tomoyo_write_pid: Specify PID to obtain domainname.
1472  *
1473  * @head: Pointer to "struct tomoyo_io_buffer".
1474  *
1475  * Returns 0.
1476  */
1477 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1478 {
1479         head->r.eof = false;
1480         return 0;
1481 }
1482
1483 /**
1484  * tomoyo_read_pid - Get domainname of the specified PID.
1485  *
1486  * @head: Pointer to "struct tomoyo_io_buffer".
1487  *
1488  * Returns the domainname which the specified PID is in on success,
1489  * empty string otherwise.
1490  * The PID is specified by tomoyo_write_pid() so that the user can obtain
1491  * using read()/write() interface rather than sysctl() interface.
1492  */
1493 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1494 {
1495         char *buf = head->write_buf;
1496         bool global_pid = false;
1497         unsigned int pid;
1498         struct task_struct *p;
1499         struct tomoyo_domain_info *domain = NULL;
1500
1501         /* Accessing write_buf is safe because head->io_sem is held. */
1502         if (!buf) {
1503                 head->r.eof = true;
1504                 return; /* Do nothing if open(O_RDONLY). */
1505         }
1506         if (head->r.w_pos || head->r.eof)
1507                 return;
1508         head->r.eof = true;
1509         if (tomoyo_str_starts(&buf, "global-pid "))
1510                 global_pid = true;
1511         pid = (unsigned int) simple_strtoul(buf, NULL, 10);
1512         rcu_read_lock();
1513         read_lock(&tasklist_lock);
1514         if (global_pid)
1515                 p = find_task_by_pid_ns(pid, &init_pid_ns);
1516         else
1517                 p = find_task_by_vpid(pid);
1518         if (p)
1519                 domain = tomoyo_real_domain(p);
1520         read_unlock(&tasklist_lock);
1521         rcu_read_unlock();
1522         if (!domain)
1523                 return;
1524         tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1525         tomoyo_set_string(head, domain->domainname->name);
1526 }
1527
1528 /* String table for domain transition control keywords. */
1529 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1530         [TOMOYO_TRANSITION_CONTROL_NO_RESET]      = "no_reset_domain ",
1531         [TOMOYO_TRANSITION_CONTROL_RESET]         = "reset_domain ",
1532         [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1533         [TOMOYO_TRANSITION_CONTROL_INITIALIZE]    = "initialize_domain ",
1534         [TOMOYO_TRANSITION_CONTROL_NO_KEEP]       = "no_keep_domain ",
1535         [TOMOYO_TRANSITION_CONTROL_KEEP]          = "keep_domain ",
1536 };
1537
1538 /* String table for grouping keywords. */
1539 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1540         [TOMOYO_PATH_GROUP]   = "path_group ",
1541         [TOMOYO_NUMBER_GROUP] = "number_group ",
1542 };
1543
1544 /**
1545  * tomoyo_write_exception - Write exception policy.
1546  *
1547  * @head: Pointer to "struct tomoyo_io_buffer".
1548  *
1549  * Returns 0 on success, negative value otherwise.
1550  *
1551  * Caller holds tomoyo_read_lock().
1552  */
1553 static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1554 {
1555         const bool is_delete = head->w.is_delete;
1556         struct tomoyo_acl_param param = {
1557                 .ns = head->w.ns,
1558                 .is_delete = is_delete,
1559                 .data = head->write_buf,
1560         };
1561         u8 i;
1562         if (tomoyo_str_starts(&param.data, "aggregator "))
1563                 return tomoyo_write_aggregator(&param);
1564         for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1565                 if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
1566                         return tomoyo_write_transition_control(&param, i);
1567         for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1568                 if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
1569                         return tomoyo_write_group(&param, i);
1570         if (tomoyo_str_starts(&param.data, "acl_group ")) {
1571                 unsigned int group;
1572                 char *data;
1573                 group = simple_strtoul(param.data, &data, 10);
1574                 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1575                         return tomoyo_write_domain2
1576                                 (head->w.ns, &head->w.ns->acl_group[group],
1577                                  data, is_delete);
1578         }
1579         return -EINVAL;
1580 }
1581
1582 /**
1583  * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group" list.
1584  *
1585  * @head: Pointer to "struct tomoyo_io_buffer".
1586  * @idx:  Index number.
1587  *
1588  * Returns true on success, false otherwise.
1589  *
1590  * Caller holds tomoyo_read_lock().
1591  */
1592 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1593 {
1594         struct tomoyo_policy_namespace *ns =
1595                 container_of(head->r.ns, typeof(*ns), namespace_list);
1596         struct list_head *list = &ns->group_list[idx];
1597         list_for_each_cookie(head->r.group, list) {
1598                 struct tomoyo_group *group =
1599                         list_entry(head->r.group, typeof(*group), head.list);
1600                 list_for_each_cookie(head->r.acl, &group->member_list) {
1601                         struct tomoyo_acl_head *ptr =
1602                                 list_entry(head->r.acl, typeof(*ptr), list);
1603                         if (ptr->is_deleted)
1604                                 continue;
1605                         if (!tomoyo_flush(head))
1606                                 return false;
1607                         tomoyo_print_namespace(head);
1608                         tomoyo_set_string(head, tomoyo_group_name[idx]);
1609                         tomoyo_set_string(head, group->group_name->name);
1610                         if (idx == TOMOYO_PATH_GROUP) {
1611                                 tomoyo_set_space(head);
1612                                 tomoyo_set_string(head, container_of
1613                                                (ptr, struct tomoyo_path_group,
1614                                                 head)->member_name->name);
1615                         } else if (idx == TOMOYO_NUMBER_GROUP) {
1616                                 tomoyo_print_number_union(head, &container_of
1617                                                           (ptr,
1618                                                    struct tomoyo_number_group,
1619                                                            head)->number);
1620                         }
1621                         tomoyo_set_lf(head);
1622                 }
1623                 head->r.acl = NULL;
1624         }
1625         head->r.group = NULL;
1626         return true;
1627 }
1628
1629 /**
1630  * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1631  *
1632  * @head: Pointer to "struct tomoyo_io_buffer".
1633  * @idx:  Index number.
1634  *
1635  * Returns true on success, false otherwise.
1636  *
1637  * Caller holds tomoyo_read_lock().
1638  */
1639 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1640 {
1641         struct tomoyo_policy_namespace *ns =
1642                 container_of(head->r.ns, typeof(*ns), namespace_list);
1643         struct list_head *list = &ns->policy_list[idx];
1644         list_for_each_cookie(head->r.acl, list) {
1645                 struct tomoyo_acl_head *acl =
1646                         container_of(head->r.acl, typeof(*acl), list);
1647                 if (acl->is_deleted)
1648                         continue;
1649                 if (!tomoyo_flush(head))
1650                         return false;
1651                 switch (idx) {
1652                 case TOMOYO_ID_TRANSITION_CONTROL:
1653                         {
1654                                 struct tomoyo_transition_control *ptr =
1655                                         container_of(acl, typeof(*ptr), head);
1656                                 tomoyo_print_namespace(head);
1657                                 tomoyo_set_string(head, tomoyo_transition_type
1658                                                   [ptr->type]);
1659                                 tomoyo_set_string(head, ptr->program ?
1660                                                   ptr->program->name : "any");
1661                                 tomoyo_set_string(head, " from ");
1662                                 tomoyo_set_string(head, ptr->domainname ?
1663                                                   ptr->domainname->name :
1664                                                   "any");
1665                         }
1666                         break;
1667                 case TOMOYO_ID_AGGREGATOR:
1668                         {
1669                                 struct tomoyo_aggregator *ptr =
1670                                         container_of(acl, typeof(*ptr), head);
1671                                 tomoyo_print_namespace(head);
1672                                 tomoyo_set_string(head, "aggregator ");
1673                                 tomoyo_set_string(head,
1674                                                   ptr->original_name->name);
1675                                 tomoyo_set_space(head);
1676                                 tomoyo_set_string(head,
1677                                                ptr->aggregated_name->name);
1678                         }
1679                         break;
1680                 default:
1681                         continue;
1682                 }
1683                 tomoyo_set_lf(head);
1684         }
1685         head->r.acl = NULL;
1686         return true;
1687 }
1688
1689 /**
1690  * tomoyo_read_exception - Read exception policy.
1691  *
1692  * @head: Pointer to "struct tomoyo_io_buffer".
1693  *
1694  * Caller holds tomoyo_read_lock().
1695  */
1696 static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1697 {
1698         struct tomoyo_policy_namespace *ns =
1699                 container_of(head->r.ns, typeof(*ns), namespace_list);
1700         if (head->r.eof)
1701                 return;
1702         while (head->r.step < TOMOYO_MAX_POLICY &&
1703                tomoyo_read_policy(head, head->r.step))
1704                 head->r.step++;
1705         if (head->r.step < TOMOYO_MAX_POLICY)
1706                 return;
1707         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1708                tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1709                 head->r.step++;
1710         if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1711                 return;
1712         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1713                + TOMOYO_MAX_ACL_GROUPS) {
1714                 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1715                         - TOMOYO_MAX_GROUP;
1716                 if (!tomoyo_read_domain2(head, &ns->acl_group
1717                                          [head->r.acl_group_index]))
1718                         return;
1719                 head->r.step++;
1720         }
1721         head->r.eof = true;
1722 }
1723
1724 /* Wait queue for kernel -> userspace notification. */
1725 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1726 /* Wait queue for userspace -> kernel notification. */
1727 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1728
1729 /* Structure for query. */
1730 struct tomoyo_query {
1731         struct list_head list;
1732         char *query;
1733         size_t query_len;
1734         unsigned int serial;
1735         u8 timer;
1736         u8 answer;
1737         u8 retry;
1738 };
1739
1740 /* The list for "struct tomoyo_query". */
1741 static LIST_HEAD(tomoyo_query_list);
1742
1743 /* Lock for manipulating tomoyo_query_list. */
1744 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1745
1746 /*
1747  * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1748  * interface.
1749  */
1750 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1751
1752 /**
1753  * tomoyo_truncate - Truncate a line.
1754  *
1755  * @str: String to truncate.
1756  *
1757  * Returns length of truncated @str.
1758  */
1759 static int tomoyo_truncate(char *str)
1760 {
1761         char *start = str;
1762         while (*(unsigned char *) str > (unsigned char) ' ')
1763                 str++;
1764         *str = '\0';
1765         return strlen(start) + 1;
1766 }
1767
1768 /**
1769  * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1770  *
1771  * @domain: Pointer to "struct tomoyo_domain_info".
1772  * @header: Lines containing ACL.
1773  *
1774  * Returns nothing.
1775  */
1776 static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
1777 {
1778         char *buffer;
1779         char *realpath = NULL;
1780         char *argv0 = NULL;
1781         char *symlink = NULL;
1782         char *cp = strchr(header, '\n');
1783         int len;
1784         if (!cp)
1785                 return;
1786         cp = strchr(cp + 1, '\n');
1787         if (!cp)
1788                 return;
1789         *cp++ = '\0';
1790         len = strlen(cp) + 1;
1791         /* strstr() will return NULL if ordering is wrong. */
1792         if (*cp == 'f') {
1793                 argv0 = strstr(header, " argv[]={ \"");
1794                 if (argv0) {
1795                         argv0 += 10;
1796                         len += tomoyo_truncate(argv0) + 14;
1797                 }
1798                 realpath = strstr(header, " exec={ realpath=\"");
1799                 if (realpath) {
1800                         realpath += 8;
1801                         len += tomoyo_truncate(realpath) + 6;
1802                 }
1803                 symlink = strstr(header, " symlink.target=\"");
1804                 if (symlink)
1805                         len += tomoyo_truncate(symlink + 1) + 1;
1806         }
1807         buffer = kmalloc(len, GFP_NOFS);
1808         if (!buffer)
1809                 return;
1810         snprintf(buffer, len - 1, "%s", cp);
1811         if (realpath)
1812                 tomoyo_addprintf(buffer, len, " exec.%s", realpath);
1813         if (argv0)
1814                 tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
1815         if (symlink)
1816                 tomoyo_addprintf(buffer, len, "%s", symlink);
1817         tomoyo_normalize_line(buffer);
1818         if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
1819                                   false))
1820                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
1821         kfree(buffer);
1822 }
1823
1824 /**
1825  * tomoyo_supervisor - Ask for the supervisor's decision.
1826  *
1827  * @r:   Pointer to "struct tomoyo_request_info".
1828  * @fmt: The printf()'s format string, followed by parameters.
1829  *
1830  * Returns 0 if the supervisor decided to permit the access request which
1831  * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1832  * supervisor decided to retry the access request which violated the policy in
1833  * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1834  */
1835 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1836 {
1837         va_list args;
1838         int error;
1839         int len;
1840         static unsigned int tomoyo_serial;
1841         struct tomoyo_query entry = { };
1842         bool quota_exceeded = false;
1843         va_start(args, fmt);
1844         len = vsnprintf((char *) &len, 1, fmt, args) + 1;
1845         va_end(args);
1846         /* Write /sys/kernel/security/tomoyo/audit. */
1847         va_start(args, fmt);
1848         tomoyo_write_log2(r, len, fmt, args);
1849         va_end(args);
1850         /* Nothing more to do if granted. */
1851         if (r->granted)
1852                 return 0;
1853         if (r->mode)
1854                 tomoyo_update_stat(r->mode);
1855         switch (r->mode) {
1856         case TOMOYO_CONFIG_ENFORCING:
1857                 error = -EPERM;
1858                 if (atomic_read(&tomoyo_query_observers))
1859                         break;
1860                 goto out;
1861         case TOMOYO_CONFIG_LEARNING:
1862                 error = 0;
1863                 /* Check max_learning_entry parameter. */
1864                 if (tomoyo_domain_quota_is_ok(r))
1865                         break;
1866                 /* fall through */
1867         default:
1868                 return 0;
1869         }
1870         /* Get message. */
1871         va_start(args, fmt);
1872         entry.query = tomoyo_init_log(r, len, fmt, args);
1873         va_end(args);
1874         if (!entry.query)
1875                 goto out;
1876         entry.query_len = strlen(entry.query) + 1;
1877         if (!error) {
1878                 tomoyo_add_entry(r->domain, entry.query);
1879                 goto out;
1880         }
1881         len = tomoyo_round2(entry.query_len);
1882         spin_lock(&tomoyo_query_list_lock);
1883         if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
1884             tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
1885             >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
1886                 quota_exceeded = true;
1887         } else {
1888                 entry.serial = tomoyo_serial++;
1889                 entry.retry = r->retry;
1890                 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
1891                 list_add_tail(&entry.list, &tomoyo_query_list);
1892         }
1893         spin_unlock(&tomoyo_query_list_lock);
1894         if (quota_exceeded)
1895                 goto out;
1896         /* Give 10 seconds for supervisor's opinion. */
1897         while (entry.timer < 10) {
1898                 wake_up_all(&tomoyo_query_wait);
1899                 if (wait_event_interruptible_timeout
1900                     (tomoyo_answer_wait, entry.answer ||
1901                      !atomic_read(&tomoyo_query_observers), HZ))
1902                         break;
1903                 else
1904                         entry.timer++;
1905         }
1906         spin_lock(&tomoyo_query_list_lock);
1907         list_del(&entry.list);
1908         tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
1909         spin_unlock(&tomoyo_query_list_lock);
1910         switch (entry.answer) {
1911         case 3: /* Asked to retry by administrator. */
1912                 error = TOMOYO_RETRY_REQUEST;
1913                 r->retry++;
1914                 break;
1915         case 1:
1916                 /* Granted by administrator. */
1917                 error = 0;
1918                 break;
1919         default:
1920                 /* Timed out or rejected by administrator. */
1921                 break;
1922         }
1923 out:
1924         kfree(entry.query);
1925         return error;
1926 }
1927
1928 /**
1929  * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
1930  *
1931  * @file: Pointer to "struct file".
1932  * @wait: Pointer to "poll_table".
1933  *
1934  * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
1935  *
1936  * Waits for access requests which violated policy in enforcing mode.
1937  */
1938 static int tomoyo_poll_query(struct file *file, poll_table *wait)
1939 {
1940         struct list_head *tmp;
1941         bool found = false;
1942         u8 i;
1943         for (i = 0; i < 2; i++) {
1944                 spin_lock(&tomoyo_query_list_lock);
1945                 list_for_each(tmp, &tomoyo_query_list) {
1946                         struct tomoyo_query *ptr =
1947                                 list_entry(tmp, typeof(*ptr), list);
1948                         if (ptr->answer)
1949                                 continue;
1950                         found = true;
1951                         break;
1952                 }
1953                 spin_unlock(&tomoyo_query_list_lock);
1954                 if (found)
1955                         return POLLIN | POLLRDNORM;
1956                 if (i)
1957                         break;
1958                 poll_wait(file, &tomoyo_query_wait, wait);
1959         }
1960         return 0;
1961 }
1962
1963 /**
1964  * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
1965  *
1966  * @head: Pointer to "struct tomoyo_io_buffer".
1967  */
1968 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
1969 {
1970         struct list_head *tmp;
1971         unsigned int pos = 0;
1972         size_t len = 0;
1973         char *buf;
1974         if (head->r.w_pos)
1975                 return;
1976         if (head->read_buf) {
1977                 kfree(head->read_buf);
1978                 head->read_buf = NULL;
1979         }
1980         spin_lock(&tomoyo_query_list_lock);
1981         list_for_each(tmp, &tomoyo_query_list) {
1982                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1983                 if (ptr->answer)
1984                         continue;
1985                 if (pos++ != head->r.query_index)
1986                         continue;
1987                 len = ptr->query_len;
1988                 break;
1989         }
1990         spin_unlock(&tomoyo_query_list_lock);
1991         if (!len) {
1992                 head->r.query_index = 0;
1993                 return;
1994         }
1995         buf = kzalloc(len + 32, GFP_NOFS);
1996         if (!buf)
1997                 return;
1998         pos = 0;
1999         spin_lock(&tomoyo_query_list_lock);
2000         list_for_each(tmp, &tomoyo_query_list) {
2001                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2002                 if (ptr->answer)
2003                         continue;
2004                 if (pos++ != head->r.query_index)
2005                         continue;
2006                 /*
2007                  * Some query can be skipped because tomoyo_query_list
2008                  * can change, but I don't care.
2009                  */
2010                 if (len == ptr->query_len)
2011                         snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
2012                                  ptr->retry, ptr->query);
2013                 break;
2014         }
2015         spin_unlock(&tomoyo_query_list_lock);
2016         if (buf[0]) {
2017                 head->read_buf = buf;
2018                 head->r.w[head->r.w_pos++] = buf;
2019                 head->r.query_index++;
2020         } else {
2021                 kfree(buf);
2022         }
2023 }
2024
2025 /**
2026  * tomoyo_write_answer - Write the supervisor's decision.
2027  *
2028  * @head: Pointer to "struct tomoyo_io_buffer".
2029  *
2030  * Returns 0 on success, -EINVAL otherwise.
2031  */
2032 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
2033 {
2034         char *data = head->write_buf;
2035         struct list_head *tmp;
2036         unsigned int serial;
2037         unsigned int answer;
2038         spin_lock(&tomoyo_query_list_lock);
2039         list_for_each(tmp, &tomoyo_query_list) {
2040                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2041                 ptr->timer = 0;
2042         }
2043         spin_unlock(&tomoyo_query_list_lock);
2044         if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
2045                 return -EINVAL;
2046         spin_lock(&tomoyo_query_list_lock);
2047         list_for_each(tmp, &tomoyo_query_list) {
2048                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2049                 if (ptr->serial != serial)
2050                         continue;
2051                 if (!ptr->answer)
2052                         ptr->answer = answer;
2053                 break;
2054         }
2055         spin_unlock(&tomoyo_query_list_lock);
2056         return 0;
2057 }
2058
2059 /**
2060  * tomoyo_read_version: Get version.
2061  *
2062  * @head: Pointer to "struct tomoyo_io_buffer".
2063  *
2064  * Returns version information.
2065  */
2066 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2067 {
2068         if (!head->r.eof) {
2069                 tomoyo_io_printf(head, "2.4.0");
2070                 head->r.eof = true;
2071         }
2072 }
2073
2074 /**
2075  * tomoyo_read_self_domain - Get the current process's domainname.
2076  *
2077  * @head: Pointer to "struct tomoyo_io_buffer".
2078  *
2079  * Returns the current process's domainname.
2080  */
2081 static void tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
2082 {
2083         if (!head->r.eof) {
2084                 /*
2085                  * tomoyo_domain()->domainname != NULL
2086                  * because every process belongs to a domain and
2087                  * the domain's name cannot be NULL.
2088                  */
2089                 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
2090                 head->r.eof = true;
2091         }
2092 }
2093
2094 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2095 static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2096         [TOMOYO_STAT_POLICY_UPDATES]    = "update:",
2097         [TOMOYO_STAT_POLICY_LEARNING]   = "violation in learning mode:",
2098         [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2099         [TOMOYO_STAT_POLICY_ENFORCING]  = "violation in enforcing mode:",
2100 };
2101
2102 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2103 static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2104         [TOMOYO_MEMORY_POLICY] = "policy:",
2105         [TOMOYO_MEMORY_AUDIT]  = "audit log:",
2106         [TOMOYO_MEMORY_QUERY]  = "query message:",
2107 };
2108
2109 /* Timestamp counter for last updated. */
2110 static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2111 /* Counter for number of updates. */
2112 static unsigned int tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2113
2114 /**
2115  * tomoyo_update_stat - Update statistic counters.
2116  *
2117  * @index: Index for policy type.
2118  *
2119  * Returns nothing.
2120  */
2121 void tomoyo_update_stat(const u8 index)
2122 {
2123         struct timeval tv;
2124         do_gettimeofday(&tv);
2125         /*
2126          * I don't use atomic operations because race condition is not fatal.
2127          */
2128         tomoyo_stat_updated[index]++;
2129         tomoyo_stat_modified[index] = tv.tv_sec;
2130 }
2131
2132 /**
2133  * tomoyo_read_stat - Read statistic data.
2134  *
2135  * @head: Pointer to "struct tomoyo_io_buffer".
2136  *
2137  * Returns nothing.
2138  */
2139 static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2140 {
2141         u8 i;
2142         unsigned int total = 0;
2143         if (head->r.eof)
2144                 return;
2145         for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2146                 tomoyo_io_printf(head, "Policy %-30s %10u",
2147                                  tomoyo_policy_headers[i],
2148                                  tomoyo_stat_updated[i]);
2149                 if (tomoyo_stat_modified[i]) {
2150                         struct tomoyo_time stamp;
2151                         tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2152                         tomoyo_io_printf(head, " (Last: %04u/%02u/%02u "
2153                                          "%02u:%02u:%02u)",
2154                                          stamp.year, stamp.month, stamp.day,
2155                                          stamp.hour, stamp.min, stamp.sec);
2156                 }
2157                 tomoyo_set_lf(head);
2158         }
2159         for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2160                 unsigned int used = tomoyo_memory_used[i];
2161                 total += used;
2162                 tomoyo_io_printf(head, "Memory used by %-22s %10u",
2163                                  tomoyo_memory_headers[i], used);
2164                 used = tomoyo_memory_quota[i];
2165                 if (used)
2166                         tomoyo_io_printf(head, " (Quota: %10u)", used);
2167                 tomoyo_set_lf(head);
2168         }
2169         tomoyo_io_printf(head, "Total memory used:                    %10u\n",
2170                          total);
2171         head->r.eof = true;
2172 }
2173
2174 /**
2175  * tomoyo_write_stat - Set memory quota.
2176  *
2177  * @head: Pointer to "struct tomoyo_io_buffer".
2178  *
2179  * Returns 0.
2180  */
2181 static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2182 {
2183         char *data = head->write_buf;
2184         u8 i;
2185         if (tomoyo_str_starts(&data, "Memory used by "))
2186                 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2187                         if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2188                                 sscanf(data, "%u", &tomoyo_memory_quota[i]);
2189         return 0;
2190 }
2191
2192 /**
2193  * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2194  *
2195  * @type: Type of interface.
2196  * @file: Pointer to "struct file".
2197  *
2198  * Returns 0 on success, negative value otherwise.
2199  */
2200 int tomoyo_open_control(const u8 type, struct file *file)
2201 {
2202         struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2203
2204         if (!head)
2205                 return -ENOMEM;
2206         mutex_init(&head->io_sem);
2207         head->type = type;
2208         switch (type) {
2209         case TOMOYO_DOMAINPOLICY:
2210                 /* /sys/kernel/security/tomoyo/domain_policy */
2211                 head->write = tomoyo_write_domain;
2212                 head->read = tomoyo_read_domain;
2213                 break;
2214         case TOMOYO_EXCEPTIONPOLICY:
2215                 /* /sys/kernel/security/tomoyo/exception_policy */
2216                 head->write = tomoyo_write_exception;
2217                 head->read = tomoyo_read_exception;
2218                 break;
2219         case TOMOYO_AUDIT:
2220                 /* /sys/kernel/security/tomoyo/audit */
2221                 head->poll = tomoyo_poll_log;
2222                 head->read = tomoyo_read_log;
2223                 break;
2224         case TOMOYO_SELFDOMAIN:
2225                 /* /sys/kernel/security/tomoyo/self_domain */
2226                 head->read = tomoyo_read_self_domain;
2227                 break;
2228         case TOMOYO_PROCESS_STATUS:
2229                 /* /sys/kernel/security/tomoyo/.process_status */
2230                 head->write = tomoyo_write_pid;
2231                 head->read = tomoyo_read_pid;
2232                 break;
2233         case TOMOYO_VERSION:
2234                 /* /sys/kernel/security/tomoyo/version */
2235                 head->read = tomoyo_read_version;
2236                 head->readbuf_size = 128;
2237                 break;
2238         case TOMOYO_STAT:
2239                 /* /sys/kernel/security/tomoyo/stat */
2240                 head->write = tomoyo_write_stat;
2241                 head->read = tomoyo_read_stat;
2242                 head->readbuf_size = 1024;
2243                 break;
2244         case TOMOYO_PROFILE:
2245                 /* /sys/kernel/security/tomoyo/profile */
2246                 head->write = tomoyo_write_profile;
2247                 head->read = tomoyo_read_profile;
2248                 break;
2249         case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2250                 head->poll = tomoyo_poll_query;
2251                 head->write = tomoyo_write_answer;
2252                 head->read = tomoyo_read_query;
2253                 break;
2254         case TOMOYO_MANAGER:
2255                 /* /sys/kernel/security/tomoyo/manager */
2256                 head->write = tomoyo_write_manager;
2257                 head->read = tomoyo_read_manager;
2258                 break;
2259         }
2260         if (!(file->f_mode & FMODE_READ)) {
2261                 /*
2262                  * No need to allocate read_buf since it is not opened
2263                  * for reading.
2264                  */
2265                 head->read = NULL;
2266                 head->poll = NULL;
2267         } else if (!head->poll) {
2268                 /* Don't allocate read_buf for poll() access. */
2269                 if (!head->readbuf_size)
2270                         head->readbuf_size = 4096 * 2;
2271                 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2272                 if (!head->read_buf) {
2273                         kfree(head);
2274                         return -ENOMEM;
2275                 }
2276         }
2277         if (!(file->f_mode & FMODE_WRITE)) {
2278                 /*
2279                  * No need to allocate write_buf since it is not opened
2280                  * for writing.
2281                  */
2282                 head->write = NULL;
2283         } else if (head->write) {
2284                 head->writebuf_size = 4096 * 2;
2285                 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2286                 if (!head->write_buf) {
2287                         kfree(head->read_buf);
2288                         kfree(head);
2289                         return -ENOMEM;
2290                 }
2291         }
2292         /*
2293          * If the file is /sys/kernel/security/tomoyo/query , increment the
2294          * observer counter.
2295          * The obserber counter is used by tomoyo_supervisor() to see if
2296          * there is some process monitoring /sys/kernel/security/tomoyo/query.
2297          */
2298         if (type == TOMOYO_QUERY)
2299                 atomic_inc(&tomoyo_query_observers);
2300         file->private_data = head;
2301         tomoyo_notify_gc(head, true);
2302         return 0;
2303 }
2304
2305 /**
2306  * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2307  *
2308  * @file: Pointer to "struct file".
2309  * @wait: Pointer to "poll_table".
2310  *
2311  * Waits for read readiness.
2312  * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd and
2313  * /sys/kernel/security/tomoyo/audit is handled by /usr/sbin/tomoyo-auditd.
2314  */
2315 int tomoyo_poll_control(struct file *file, poll_table *wait)
2316 {
2317         struct tomoyo_io_buffer *head = file->private_data;
2318         if (!head->poll)
2319                 return -ENOSYS;
2320         return head->poll(file, wait);
2321 }
2322
2323 /**
2324  * tomoyo_set_namespace_cursor - Set namespace to read.
2325  *
2326  * @head: Pointer to "struct tomoyo_io_buffer".
2327  *
2328  * Returns nothing.
2329  */
2330 static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2331 {
2332         struct list_head *ns;
2333         if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2334             head->type != TOMOYO_PROFILE)
2335                 return;
2336         /*
2337          * If this is the first read, or reading previous namespace finished
2338          * and has more namespaces to read, update the namespace cursor.
2339          */
2340         ns = head->r.ns;
2341         if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2342                 /* Clearing is OK because tomoyo_flush() returned true. */
2343                 memset(&head->r, 0, sizeof(head->r));
2344                 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2345         }
2346 }
2347
2348 /**
2349  * tomoyo_has_more_namespace - Check for unread namespaces.
2350  *
2351  * @head: Pointer to "struct tomoyo_io_buffer".
2352  *
2353  * Returns true if we have more entries to print, false otherwise.
2354  */
2355 static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2356 {
2357         return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2358                 head->type == TOMOYO_PROFILE) && head->r.eof &&
2359                 head->r.ns->next != &tomoyo_namespace_list;
2360 }
2361
2362 /**
2363  * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2364  *
2365  * @head:       Pointer to "struct tomoyo_io_buffer".
2366  * @buffer:     Poiner to buffer to write to.
2367  * @buffer_len: Size of @buffer.
2368  *
2369  * Returns bytes read on success, negative value otherwise.
2370  */
2371 ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2372                             const int buffer_len)
2373 {
2374         int len;
2375         int idx;
2376
2377         if (!head->read)
2378                 return -ENOSYS;
2379         if (mutex_lock_interruptible(&head->io_sem))
2380                 return -EINTR;
2381         head->read_user_buf = buffer;
2382         head->read_user_buf_avail = buffer_len;
2383         idx = tomoyo_read_lock();
2384         if (tomoyo_flush(head))
2385                 /* Call the policy handler. */
2386                 do {
2387                         tomoyo_set_namespace_cursor(head);
2388                         head->read(head);
2389                 } while (tomoyo_flush(head) &&
2390                          tomoyo_has_more_namespace(head));
2391         tomoyo_read_unlock(idx);
2392         len = head->read_user_buf - buffer;
2393         mutex_unlock(&head->io_sem);
2394         return len;
2395 }
2396
2397 /**
2398  * tomoyo_parse_policy - Parse a policy line.
2399  *
2400  * @head: Poiter to "struct tomoyo_io_buffer".
2401  * @line: Line to parse.
2402  *
2403  * Returns 0 on success, negative value otherwise.
2404  *
2405  * Caller holds tomoyo_read_lock().
2406  */
2407 static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2408 {
2409         /* Delete request? */
2410         head->w.is_delete = !strncmp(line, "delete ", 7);
2411         if (head->w.is_delete)
2412                 memmove(line, line + 7, strlen(line + 7) + 1);
2413         /* Selecting namespace to update. */
2414         if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2415             head->type == TOMOYO_PROFILE) {
2416                 if (*line == '<') {
2417                         char *cp = strchr(line, ' ');
2418                         if (cp) {
2419                                 *cp++ = '\0';
2420                                 head->w.ns = tomoyo_assign_namespace(line);
2421                                 memmove(line, cp, strlen(cp) + 1);
2422                         } else
2423                                 head->w.ns = NULL;
2424                 } else
2425                         head->w.ns = &tomoyo_kernel_namespace;
2426                 /* Don't allow updating if namespace is invalid. */
2427                 if (!head->w.ns)
2428                         return -ENOENT;
2429         }
2430         /* Do the update. */
2431         return head->write(head);
2432 }
2433
2434 /**
2435  * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2436  *
2437  * @head:       Pointer to "struct tomoyo_io_buffer".
2438  * @buffer:     Pointer to buffer to read from.
2439  * @buffer_len: Size of @buffer.
2440  *
2441  * Returns @buffer_len on success, negative value otherwise.
2442  */
2443 ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2444                              const char __user *buffer, const int buffer_len)
2445 {
2446         int error = buffer_len;
2447         size_t avail_len = buffer_len;
2448         char *cp0 = head->write_buf;
2449         int idx;
2450         if (!head->write)
2451                 return -ENOSYS;
2452         if (!access_ok(VERIFY_READ, buffer, buffer_len))
2453                 return -EFAULT;
2454         if (mutex_lock_interruptible(&head->io_sem))
2455                 return -EINTR;
2456         idx = tomoyo_read_lock();
2457         /* Read a line and dispatch it to the policy handler. */
2458         while (avail_len > 0) {
2459                 char c;
2460                 if (head->w.avail >= head->writebuf_size - 1) {
2461                         const int len = head->writebuf_size * 2;
2462                         char *cp = kzalloc(len, GFP_NOFS);
2463                         if (!cp) {
2464                                 error = -ENOMEM;
2465                                 break;
2466                         }
2467                         memmove(cp, cp0, head->w.avail);
2468                         kfree(cp0);
2469                         head->write_buf = cp;
2470                         cp0 = cp;
2471                         head->writebuf_size = len;
2472                 }
2473                 if (get_user(c, buffer)) {
2474                         error = -EFAULT;
2475                         break;
2476                 }
2477                 buffer++;
2478                 avail_len--;
2479                 cp0[head->w.avail++] = c;
2480                 if (c != '\n')
2481                         continue;
2482                 cp0[head->w.avail - 1] = '\0';
2483                 head->w.avail = 0;
2484                 tomoyo_normalize_line(cp0);
2485                 if (!strcmp(cp0, "reset")) {
2486                         head->w.ns = &tomoyo_kernel_namespace;
2487                         head->w.domain = NULL;
2488                         memset(&head->r, 0, sizeof(head->r));
2489                         continue;
2490                 }
2491                 /* Don't allow updating policies by non manager programs. */
2492                 switch (head->type) {
2493                 case TOMOYO_PROCESS_STATUS:
2494                         /* This does not write anything. */
2495                         break;
2496                 case TOMOYO_DOMAINPOLICY:
2497                         if (tomoyo_select_domain(head, cp0))
2498                                 continue;
2499                         /* fall through */
2500                 case TOMOYO_EXCEPTIONPOLICY:
2501                         if (!strcmp(cp0, "select transition_only")) {
2502                                 head->r.print_transition_related_only = true;
2503                                 continue;
2504                         }
2505                         /* fall through */
2506                 default:
2507                         if (!tomoyo_manager()) {
2508                                 error = -EPERM;
2509                                 goto out;
2510                         }
2511                 }
2512                 switch (tomoyo_parse_policy(head, cp0)) {
2513                 case -EPERM:
2514                         error = -EPERM;
2515                         goto out;
2516                 case 0:
2517                         switch (head->type) {
2518                         case TOMOYO_DOMAINPOLICY:
2519                         case TOMOYO_EXCEPTIONPOLICY:
2520                         case TOMOYO_STAT:
2521                         case TOMOYO_PROFILE:
2522                         case TOMOYO_MANAGER:
2523                                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2524                                 break;
2525                         default:
2526                                 break;
2527                         }
2528                         break;
2529                 }
2530         }
2531 out:
2532         tomoyo_read_unlock(idx);
2533         mutex_unlock(&head->io_sem);
2534         return error;
2535 }
2536
2537 /**
2538  * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2539  *
2540  * @head: Pointer to "struct tomoyo_io_buffer".
2541  *
2542  * Returns 0.
2543  */
2544 int tomoyo_close_control(struct tomoyo_io_buffer *head)
2545 {
2546         /*
2547          * If the file is /sys/kernel/security/tomoyo/query , decrement the
2548          * observer counter.
2549          */
2550         if (head->type == TOMOYO_QUERY &&
2551             atomic_dec_and_test(&tomoyo_query_observers))
2552                 wake_up_all(&tomoyo_answer_wait);
2553         tomoyo_notify_gc(head, false);
2554         return 0;
2555 }
2556
2557 /**
2558  * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2559  */
2560 void tomoyo_check_profile(void)
2561 {
2562         struct tomoyo_domain_info *domain;
2563         const int idx = tomoyo_read_lock();
2564         tomoyo_policy_loaded = true;
2565         printk(KERN_INFO "TOMOYO: 2.4.0\n");
2566         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2567                 const u8 profile = domain->profile;
2568                 const struct tomoyo_policy_namespace *ns = domain->ns;
2569                 if (ns->profile_version != 20100903)
2570                         printk(KERN_ERR
2571                                "Profile version %u is not supported.\n",
2572                                ns->profile_version);
2573                 else if (!ns->profile_ptr[profile])
2574                         printk(KERN_ERR
2575                                "Profile %u (used by '%s') is not defined.\n",
2576                                profile, domain->domainname->name);
2577                 else
2578                         continue;
2579                 printk(KERN_ERR
2580                        "Userland tools for TOMOYO 2.4 must be installed and "
2581                        "policy must be initialized.\n");
2582                 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.4/ "
2583                        "for more information.\n");
2584                 panic("STOP!");
2585         }
2586         tomoyo_read_unlock(idx);
2587         printk(KERN_INFO "Mandatory Access Control activated.\n");
2588 }
2589
2590 /**
2591  * tomoyo_load_builtin_policy - Load built-in policy.
2592  *
2593  * Returns nothing.
2594  */
2595 void __init tomoyo_load_builtin_policy(void)
2596 {
2597         /*
2598          * This include file is manually created and contains built-in policy
2599          * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2600          * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2601          * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2602          */
2603 #include "builtin-policy.h"
2604         u8 i;
2605         const int idx = tomoyo_read_lock();
2606         for (i = 0; i < 5; i++) {
2607                 struct tomoyo_io_buffer head = { };
2608                 char *start = "";
2609                 switch (i) {
2610                 case 0:
2611                         start = tomoyo_builtin_profile;
2612                         head.type = TOMOYO_PROFILE;
2613                         head.write = tomoyo_write_profile;
2614                         break;
2615                 case 1:
2616                         start = tomoyo_builtin_exception_policy;
2617                         head.type = TOMOYO_EXCEPTIONPOLICY;
2618                         head.write = tomoyo_write_exception;
2619                         break;
2620                 case 2:
2621                         start = tomoyo_builtin_domain_policy;
2622                         head.type = TOMOYO_DOMAINPOLICY;
2623                         head.write = tomoyo_write_domain;
2624                         break;
2625                 case 3:
2626                         start = tomoyo_builtin_manager;
2627                         head.type = TOMOYO_MANAGER;
2628                         head.write = tomoyo_write_manager;
2629                         break;
2630                 case 4:
2631                         start = tomoyo_builtin_stat;
2632                         head.type = TOMOYO_STAT;
2633                         head.write = tomoyo_write_stat;
2634                         break;
2635                 }
2636                 while (1) {
2637                         char *end = strchr(start, '\n');
2638                         if (!end)
2639                                 break;
2640                         *end = '\0';
2641                         tomoyo_normalize_line(start);
2642                         head.write_buf = start;
2643                         tomoyo_parse_policy(&head, start);
2644                         start = end + 1;
2645                 }
2646         }
2647         tomoyo_read_unlock(idx);
2648 #ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2649         tomoyo_check_profile();
2650 #endif
2651 }