common.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * security/tomoyo/common.c
   4 *
   5 * Copyright (C) 2005-2011  NTT DATA CORPORATION
   6 */
   7
   8#include <linux/uaccess.h>
   9#include <linux/slab.h>
  10#include <linux/security.h>
  11#include <linux/string_helpers.h>
  12#include "common.h"
  13
  14/* String table for operation mode. */
  15const char * const tomoyo_mode[TOMOYO_CONFIG_MAX_MODE] = {
  16	[TOMOYO_CONFIG_DISABLED]   = "disabled",
  17	[TOMOYO_CONFIG_LEARNING]   = "learning",
  18	[TOMOYO_CONFIG_PERMISSIVE] = "permissive",
  19	[TOMOYO_CONFIG_ENFORCING]  = "enforcing"
  20};
  21
  22/* String table for /sys/kernel/security/tomoyo/profile */
  23const char * const tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
  24				       + TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
  25	/* CONFIG::file group */
  26	[TOMOYO_MAC_FILE_EXECUTE]    = "execute",
  27	[TOMOYO_MAC_FILE_OPEN]       = "open",
  28	[TOMOYO_MAC_FILE_CREATE]     = "create",
  29	[TOMOYO_MAC_FILE_UNLINK]     = "unlink",
  30	[TOMOYO_MAC_FILE_GETATTR]    = "getattr",
  31	[TOMOYO_MAC_FILE_MKDIR]      = "mkdir",
  32	[TOMOYO_MAC_FILE_RMDIR]      = "rmdir",
  33	[TOMOYO_MAC_FILE_MKFIFO]     = "mkfifo",
  34	[TOMOYO_MAC_FILE_MKSOCK]     = "mksock",
  35	[TOMOYO_MAC_FILE_TRUNCATE]   = "truncate",
  36	[TOMOYO_MAC_FILE_SYMLINK]    = "symlink",
  37	[TOMOYO_MAC_FILE_MKBLOCK]    = "mkblock",
  38	[TOMOYO_MAC_FILE_MKCHAR]     = "mkchar",
  39	[TOMOYO_MAC_FILE_LINK]       = "link",
  40	[TOMOYO_MAC_FILE_RENAME]     = "rename",
  41	[TOMOYO_MAC_FILE_CHMOD]      = "chmod",
  42	[TOMOYO_MAC_FILE_CHOWN]      = "chown",
  43	[TOMOYO_MAC_FILE_CHGRP]      = "chgrp",
  44	[TOMOYO_MAC_FILE_IOCTL]      = "ioctl",
  45	[TOMOYO_MAC_FILE_CHROOT]     = "chroot",
  46	[TOMOYO_MAC_FILE_MOUNT]      = "mount",
  47	[TOMOYO_MAC_FILE_UMOUNT]     = "unmount",
  48	[TOMOYO_MAC_FILE_PIVOT_ROOT] = "pivot_root",
  49	/* CONFIG::network group */
  50	[TOMOYO_MAC_NETWORK_INET_STREAM_BIND]       = "inet_stream_bind",
  51	[TOMOYO_MAC_NETWORK_INET_STREAM_LISTEN]     = "inet_stream_listen",
  52	[TOMOYO_MAC_NETWORK_INET_STREAM_CONNECT]    = "inet_stream_connect",
  53	[TOMOYO_MAC_NETWORK_INET_DGRAM_BIND]        = "inet_dgram_bind",
  54	[TOMOYO_MAC_NETWORK_INET_DGRAM_SEND]        = "inet_dgram_send",
  55	[TOMOYO_MAC_NETWORK_INET_RAW_BIND]          = "inet_raw_bind",
  56	[TOMOYO_MAC_NETWORK_INET_RAW_SEND]          = "inet_raw_send",
  57	[TOMOYO_MAC_NETWORK_UNIX_STREAM_BIND]       = "unix_stream_bind",
  58	[TOMOYO_MAC_NETWORK_UNIX_STREAM_LISTEN]     = "unix_stream_listen",
  59	[TOMOYO_MAC_NETWORK_UNIX_STREAM_CONNECT]    = "unix_stream_connect",
  60	[TOMOYO_MAC_NETWORK_UNIX_DGRAM_BIND]        = "unix_dgram_bind",
  61	[TOMOYO_MAC_NETWORK_UNIX_DGRAM_SEND]        = "unix_dgram_send",
  62	[TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_BIND]    = "unix_seqpacket_bind",
  63	[TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_LISTEN]  = "unix_seqpacket_listen",
  64	[TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_CONNECT] = "unix_seqpacket_connect",
  65	/* CONFIG::misc group */
  66	[TOMOYO_MAC_ENVIRON] = "env",
  67	/* CONFIG group */
  68	[TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file",
  69	[TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_NETWORK] = "network",
  70	[TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_MISC] = "misc",
  71};
  72
  73/* String table for conditions. */
  74const char * const tomoyo_condition_keyword[TOMOYO_MAX_CONDITION_KEYWORD] = {
  75	[TOMOYO_TASK_UID]             = "task.uid",
  76	[TOMOYO_TASK_EUID]            = "task.euid",
  77	[TOMOYO_TASK_SUID]            = "task.suid",
  78	[TOMOYO_TASK_FSUID]           = "task.fsuid",
  79	[TOMOYO_TASK_GID]             = "task.gid",
  80	[TOMOYO_TASK_EGID]            = "task.egid",
  81	[TOMOYO_TASK_SGID]            = "task.sgid",
  82	[TOMOYO_TASK_FSGID]           = "task.fsgid",
  83	[TOMOYO_TASK_PID]             = "task.pid",
  84	[TOMOYO_TASK_PPID]            = "task.ppid",
  85	[TOMOYO_EXEC_ARGC]            = "exec.argc",
  86	[TOMOYO_EXEC_ENVC]            = "exec.envc",
  87	[TOMOYO_TYPE_IS_SOCKET]       = "socket",
  88	[TOMOYO_TYPE_IS_SYMLINK]      = "symlink",
  89	[TOMOYO_TYPE_IS_FILE]         = "file",
  90	[TOMOYO_TYPE_IS_BLOCK_DEV]    = "block",
  91	[TOMOYO_TYPE_IS_DIRECTORY]    = "directory",
  92	[TOMOYO_TYPE_IS_CHAR_DEV]     = "char",
  93	[TOMOYO_TYPE_IS_FIFO]         = "fifo",
  94	[TOMOYO_MODE_SETUID]          = "setuid",
  95	[TOMOYO_MODE_SETGID]          = "setgid",
  96	[TOMOYO_MODE_STICKY]          = "sticky",
  97	[TOMOYO_MODE_OWNER_READ]      = "owner_read",
  98	[TOMOYO_MODE_OWNER_WRITE]     = "owner_write",
  99	[TOMOYO_MODE_OWNER_EXECUTE]   = "owner_execute",
 100	[TOMOYO_MODE_GROUP_READ]      = "group_read",
 101	[TOMOYO_MODE_GROUP_WRITE]     = "group_write",
 102	[TOMOYO_MODE_GROUP_EXECUTE]   = "group_execute",
 103	[TOMOYO_MODE_OTHERS_READ]     = "others_read",
 104	[TOMOYO_MODE_OTHERS_WRITE]    = "others_write",
 105	[TOMOYO_MODE_OTHERS_EXECUTE]  = "others_execute",
 106	[TOMOYO_EXEC_REALPATH]        = "exec.realpath",
 107	[TOMOYO_SYMLINK_TARGET]       = "symlink.target",
 108	[TOMOYO_PATH1_UID]            = "path1.uid",
 109	[TOMOYO_PATH1_GID]            = "path1.gid",
 110	[TOMOYO_PATH1_INO]            = "path1.ino",
 111	[TOMOYO_PATH1_MAJOR]          = "path1.major",
 112	[TOMOYO_PATH1_MINOR]          = "path1.minor",
 113	[TOMOYO_PATH1_PERM]           = "path1.perm",
 114	[TOMOYO_PATH1_TYPE]           = "path1.type",
 115	[TOMOYO_PATH1_DEV_MAJOR]      = "path1.dev_major",
 116	[TOMOYO_PATH1_DEV_MINOR]      = "path1.dev_minor",
 117	[TOMOYO_PATH2_UID]            = "path2.uid",
 118	[TOMOYO_PATH2_GID]            = "path2.gid",
 119	[TOMOYO_PATH2_INO]            = "path2.ino",
 120	[TOMOYO_PATH2_MAJOR]          = "path2.major",
 121	[TOMOYO_PATH2_MINOR]          = "path2.minor",
 122	[TOMOYO_PATH2_PERM]           = "path2.perm",
 123	[TOMOYO_PATH2_TYPE]           = "path2.type",
 124	[TOMOYO_PATH2_DEV_MAJOR]      = "path2.dev_major",
 125	[TOMOYO_PATH2_DEV_MINOR]      = "path2.dev_minor",
 126	[TOMOYO_PATH1_PARENT_UID]     = "path1.parent.uid",
 127	[TOMOYO_PATH1_PARENT_GID]     = "path1.parent.gid",
 128	[TOMOYO_PATH1_PARENT_INO]     = "path1.parent.ino",
 129	[TOMOYO_PATH1_PARENT_PERM]    = "path1.parent.perm",
 130	[TOMOYO_PATH2_PARENT_UID]     = "path2.parent.uid",
 131	[TOMOYO_PATH2_PARENT_GID]     = "path2.parent.gid",
 132	[TOMOYO_PATH2_PARENT_INO]     = "path2.parent.ino",
 133	[TOMOYO_PATH2_PARENT_PERM]    = "path2.parent.perm",
 134};
 135
 136/* String table for PREFERENCE keyword. */
 137static const char * const tomoyo_pref_keywords[TOMOYO_MAX_PREF] = {
 138	[TOMOYO_PREF_MAX_AUDIT_LOG]      = "max_audit_log",
 139	[TOMOYO_PREF_MAX_LEARNING_ENTRY] = "max_learning_entry",
 140};
 141
 142/* String table for path operation. */
 143const char * const tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = {
 144	[TOMOYO_TYPE_EXECUTE]    = "execute",
 145	[TOMOYO_TYPE_READ]       = "read",
 146	[TOMOYO_TYPE_WRITE]      = "write",
 147	[TOMOYO_TYPE_APPEND]     = "append",
 148	[TOMOYO_TYPE_UNLINK]     = "unlink",
 149	[TOMOYO_TYPE_GETATTR]    = "getattr",
 150	[TOMOYO_TYPE_RMDIR]      = "rmdir",
 151	[TOMOYO_TYPE_TRUNCATE]   = "truncate",
 152	[TOMOYO_TYPE_SYMLINK]    = "symlink",
 153	[TOMOYO_TYPE_CHROOT]     = "chroot",
 154	[TOMOYO_TYPE_UMOUNT]     = "unmount",
 155};
 156
 157/* String table for socket's operation. */
 158const char * const tomoyo_socket_keyword[TOMOYO_MAX_NETWORK_OPERATION] = {
 159	[TOMOYO_NETWORK_BIND]    = "bind",
 160	[TOMOYO_NETWORK_LISTEN]  = "listen",
 161	[TOMOYO_NETWORK_CONNECT] = "connect",
 162	[TOMOYO_NETWORK_SEND]    = "send",
 163};
 164
 165/* String table for categories. */
 166static const char * const tomoyo_category_keywords
 167[TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
 168	[TOMOYO_MAC_CATEGORY_FILE]    = "file",
 169	[TOMOYO_MAC_CATEGORY_NETWORK] = "network",
 170	[TOMOYO_MAC_CATEGORY_MISC]    = "misc",
 171};
 172
 173/* Permit policy management by non-root user? */
 174static bool tomoyo_manage_by_non_root;
 175
 176/* Utility functions. */
 177
 178/**
 179 * tomoyo_addprintf - strncat()-like-snprintf().
 180 *
 181 * @buffer: Buffer to write to. Must be '\0'-terminated.
 182 * @len:    Size of @buffer.
 183 * @fmt:    The printf()'s format string, followed by parameters.
 184 *
 185 * Returns nothing.
 186 */
 187__printf(3, 4)
 188static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...)
 189{
 190	va_list args;
 191	const int pos = strlen(buffer);
 192
 193	va_start(args, fmt);
 194	vsnprintf(buffer + pos, len - pos - 1, fmt, args);
 195	va_end(args);
 196}
 197
 198/**
 199 * tomoyo_flush - Flush queued string to userspace's buffer.
 200 *
 201 * @head:   Pointer to "struct tomoyo_io_buffer".
 202 *
 203 * Returns true if all data was flushed, false otherwise.
 204 */
 205static bool tomoyo_flush(struct tomoyo_io_buffer *head)
 206{
 207	while (head->r.w_pos) {
 208		const char *w = head->r.w[0];
 209		size_t len = strlen(w);
 210
 211		if (len) {
 212			if (len > head->read_user_buf_avail)
 213				len = head->read_user_buf_avail;
 214			if (!len)
 215				return false;
 216			if (copy_to_user(head->read_user_buf, w, len))
 217				return false;
 218			head->read_user_buf_avail -= len;
 219			head->read_user_buf += len;
 220			w += len;
 221		}
 222		head->r.w[0] = w;
 223		if (*w)
 224			return false;
 225		/* Add '\0' for audit logs and query. */
 226		if (head->poll) {
 227			if (!head->read_user_buf_avail ||
 228			    copy_to_user(head->read_user_buf, "", 1))
 229				return false;
 230			head->read_user_buf_avail--;
 231			head->read_user_buf++;
 232		}
 233		head->r.w_pos--;
 234		for (len = 0; len < head->r.w_pos; len++)
 235			head->r.w[len] = head->r.w[len + 1];
 236	}
 237	head->r.avail = 0;
 238	return true;
 239}
 240
 241/**
 242 * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
 243 *
 244 * @head:   Pointer to "struct tomoyo_io_buffer".
 245 * @string: String to print.
 246 *
 247 * Note that @string has to be kept valid until @head is kfree()d.
 248 * This means that char[] allocated on stack memory cannot be passed to
 249 * this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
 250 */
 251static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string)
 252{
 253	if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) {
 254		head->r.w[head->r.w_pos++] = string;
 255		tomoyo_flush(head);
 256	} else
 257		WARN_ON(1);
 258}
 259
 260static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
 261			     ...) __printf(2, 3);
 262
 263/**
 264 * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
 265 *
 266 * @head: Pointer to "struct tomoyo_io_buffer".
 267 * @fmt:  The printf()'s format string, followed by parameters.
 268 */
 269static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
 270			     ...)
 271{
 272	va_list args;
 273	size_t len;
 274	size_t pos = head->r.avail;
 275	int size = head->readbuf_size - pos;
 276
 277	if (size <= 0)
 278		return;
 279	va_start(args, fmt);
 280	len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
 281	va_end(args);
 282	if (pos + len >= head->readbuf_size) {
 283		WARN_ON(1);
 284		return;
 285	}
 286	head->r.avail += len;
 287	tomoyo_set_string(head, head->read_buf + pos);
 288}
 289
 290/**
 291 * tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure.
 292 *
 293 * @head: Pointer to "struct tomoyo_io_buffer".
 294 *
 295 * Returns nothing.
 296 */
 297static void tomoyo_set_space(struct tomoyo_io_buffer *head)
 298{
 299	tomoyo_set_string(head, " ");
 300}
 301
 302/**
 303 * tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure.
 304 *
 305 * @head: Pointer to "struct tomoyo_io_buffer".
 306 *
 307 * Returns nothing.
 308 */
 309static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
 310{
 311	tomoyo_set_string(head, "\n");
 312	return !head->r.w_pos;
 313}
 314
 315/**
 316 * tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure.
 317 *
 318 * @head: Pointer to "struct tomoyo_io_buffer".
 319 *
 320 * Returns nothing.
 321 */
 322static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
 323{
 324	tomoyo_set_string(head, "/");
 325}
 326
 327/* List of namespaces. */
 328LIST_HEAD(tomoyo_namespace_list);
 329/* True if namespace other than tomoyo_kernel_namespace is defined. */
 330static bool tomoyo_namespace_enabled;
 331
 332/**
 333 * tomoyo_init_policy_namespace - Initialize namespace.
 334 *
 335 * @ns: Pointer to "struct tomoyo_policy_namespace".
 336 *
 337 * Returns nothing.
 338 */
 339void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns)
 340{
 341	unsigned int idx;
 342
 343	for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++)
 344		INIT_LIST_HEAD(&ns->acl_group[idx]);
 345	for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++)
 346		INIT_LIST_HEAD(&ns->group_list[idx]);
 347	for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++)
 348		INIT_LIST_HEAD(&ns->policy_list[idx]);
 349	ns->profile_version = 20150505;
 350	tomoyo_namespace_enabled = !list_empty(&tomoyo_namespace_list);
 351	list_add_tail_rcu(&ns->namespace_list, &tomoyo_namespace_list);
 352}
 353
 354/**
 355 * tomoyo_print_namespace - Print namespace header.
 356 *
 357 * @head: Pointer to "struct tomoyo_io_buffer".
 358 *
 359 * Returns nothing.
 360 */
 361static void tomoyo_print_namespace(struct tomoyo_io_buffer *head)
 362{
 363	if (!tomoyo_namespace_enabled)
 364		return;
 365	tomoyo_set_string(head,
 366			  container_of(head->r.ns,
 367				       struct tomoyo_policy_namespace,
 368				       namespace_list)->name);
 369	tomoyo_set_space(head);
 370}
 371
 372/**
 373 * tomoyo_print_name_union - Print a tomoyo_name_union.
 374 *
 375 * @head: Pointer to "struct tomoyo_io_buffer".
 376 * @ptr:  Pointer to "struct tomoyo_name_union".
 377 */
 378static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
 379				    const struct tomoyo_name_union *ptr)
 380{
 381	tomoyo_set_space(head);
 382	if (ptr->group) {
 383		tomoyo_set_string(head, "@");
 384		tomoyo_set_string(head, ptr->group->group_name->name);
 385	} else {
 386		tomoyo_set_string(head, ptr->filename->name);
 387	}
 388}
 389
 390/**
 391 * tomoyo_print_name_union_quoted - Print a tomoyo_name_union with a quote.
 392 *
 393 * @head: Pointer to "struct tomoyo_io_buffer".
 394 * @ptr:  Pointer to "struct tomoyo_name_union".
 395 *
 396 * Returns nothing.
 397 */
 398static void tomoyo_print_name_union_quoted(struct tomoyo_io_buffer *head,
 399					   const struct tomoyo_name_union *ptr)
 400{
 401	if (ptr->group) {
 402		tomoyo_set_string(head, "@");
 403		tomoyo_set_string(head, ptr->group->group_name->name);
 404	} else {
 405		tomoyo_set_string(head, "\"");
 406		tomoyo_set_string(head, ptr->filename->name);
 407		tomoyo_set_string(head, "\"");
 408	}
 409}
 410
 411/**
 412 * tomoyo_print_number_union_nospace - Print a tomoyo_number_union without a space.
 413 *
 414 * @head: Pointer to "struct tomoyo_io_buffer".
 415 * @ptr:  Pointer to "struct tomoyo_number_union".
 416 *
 417 * Returns nothing.
 418 */
 419static void tomoyo_print_number_union_nospace
 420(struct tomoyo_io_buffer *head, const struct tomoyo_number_union *ptr)
 421{
 422	if (ptr->group) {
 423		tomoyo_set_string(head, "@");
 424		tomoyo_set_string(head, ptr->group->group_name->name);
 425	} else {
 426		int i;
 427		unsigned long min = ptr->values[0];
 428		const unsigned long max = ptr->values[1];
 429		u8 min_type = ptr->value_type[0];
 430		const u8 max_type = ptr->value_type[1];
 431		char buffer[128];
 432
 433		buffer[0] = '\0';
 434		for (i = 0; i < 2; i++) {
 435			switch (min_type) {
 436			case TOMOYO_VALUE_TYPE_HEXADECIMAL:
 437				tomoyo_addprintf(buffer, sizeof(buffer),
 438						 "0x%lX", min);
 439				break;
 440			case TOMOYO_VALUE_TYPE_OCTAL:
 441				tomoyo_addprintf(buffer, sizeof(buffer),
 442						 "0%lo", min);
 443				break;
 444			default:
 445				tomoyo_addprintf(buffer, sizeof(buffer), "%lu",
 446						 min);
 447				break;
 448			}
 449			if (min == max && min_type == max_type)
 450				break;
 451			tomoyo_addprintf(buffer, sizeof(buffer), "-");
 452			min_type = max_type;
 453			min = max;
 454		}
 455		tomoyo_io_printf(head, "%s", buffer);
 456	}
 457}
 458
 459/**
 460 * tomoyo_print_number_union - Print a tomoyo_number_union.
 461 *
 462 * @head: Pointer to "struct tomoyo_io_buffer".
 463 * @ptr:  Pointer to "struct tomoyo_number_union".
 464 *
 465 * Returns nothing.
 466 */
 467static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
 468				      const struct tomoyo_number_union *ptr)
 469{
 470	tomoyo_set_space(head);
 471	tomoyo_print_number_union_nospace(head, ptr);
 472}
 473
 474/**
 475 * tomoyo_assign_profile - Create a new profile.
 476 *
 477 * @ns:      Pointer to "struct tomoyo_policy_namespace".
 478 * @profile: Profile number to create.
 479 *
 480 * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
 481 */
 482static struct tomoyo_profile *tomoyo_assign_profile
 483(struct tomoyo_policy_namespace *ns, const unsigned int profile)
 484{
 485	struct tomoyo_profile *ptr;
 486	struct tomoyo_profile *entry;
 487
 488	if (profile >= TOMOYO_MAX_PROFILES)
 489		return NULL;
 490	ptr = ns->profile_ptr[profile];
 491	if (ptr)
 492		return ptr;
 493	entry = kzalloc(sizeof(*entry), GFP_NOFS | __GFP_NOWARN);
 494	if (mutex_lock_interruptible(&tomoyo_policy_lock))
 495		goto out;
 496	ptr = ns->profile_ptr[profile];
 497	if (!ptr && tomoyo_memory_ok(entry)) {
 498		ptr = entry;
 499		ptr->default_config = TOMOYO_CONFIG_DISABLED |
 500			TOMOYO_CONFIG_WANT_GRANT_LOG |
 501			TOMOYO_CONFIG_WANT_REJECT_LOG;
 502		memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
 503		       sizeof(ptr->config));
 504		ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] =
 505			CONFIG_SECURITY_TOMOYO_MAX_AUDIT_LOG;
 506		ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] =
 507			CONFIG_SECURITY_TOMOYO_MAX_ACCEPT_ENTRY;
 508		mb(); /* Avoid out-of-order execution. */
 509		ns->profile_ptr[profile] = ptr;
 510		entry = NULL;
 511	}
 512	mutex_unlock(&tomoyo_policy_lock);
 513 out:
 514	kfree(entry);
 515	return ptr;
 516}
 517
 518/**
 519 * tomoyo_profile - Find a profile.
 520 *
 521 * @ns:      Pointer to "struct tomoyo_policy_namespace".
 522 * @profile: Profile number to find.
 523 *
 524 * Returns pointer to "struct tomoyo_profile".
 525 */
 526struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns,
 527				      const u8 profile)
 528{
 529	static struct tomoyo_profile tomoyo_null_profile;
 530	struct tomoyo_profile *ptr = ns->profile_ptr[profile];
 531
 532	if (!ptr)
 533		ptr = &tomoyo_null_profile;
 534	return ptr;
 535}
 536
 537/**
 538 * tomoyo_find_yesno - Find values for specified keyword.
 539 *
 540 * @string: String to check.
 541 * @find:   Name of keyword.
 542 *
 543 * Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise.
 544 */
 545static s8 tomoyo_find_yesno(const char *string, const char *find)
 546{
 547	const char *cp = strstr(string, find);
 548
 549	if (cp) {
 550		cp += strlen(find);
 551		if (!strncmp(cp, "=yes", 4))
 552			return 1;
 553		else if (!strncmp(cp, "=no", 3))
 554			return 0;
 555	}
 556	return -1;
 557}
 558
 559/**
 560 * tomoyo_set_uint - Set value for specified preference.
 561 *
 562 * @i:      Pointer to "unsigned int".
 563 * @string: String to check.
 564 * @find:   Name of keyword.
 565 *
 566 * Returns nothing.
 567 */
 568static void tomoyo_set_uint(unsigned int *i, const char *string,
 569			    const char *find)
 570{
 571	const char *cp = strstr(string, find);
 572
 573	if (cp)
 574		sscanf(cp + strlen(find), "=%u", i);
 575}
 576
 577/**
 578 * tomoyo_set_mode - Set mode for specified profile.
 579 *
 580 * @name:    Name of functionality.
 581 * @value:   Mode for @name.
 582 * @profile: Pointer to "struct tomoyo_profile".
 583 *
 584 * Returns 0 on success, negative value otherwise.
 585 */
 586static int tomoyo_set_mode(char *name, const char *value,
 587			   struct tomoyo_profile *profile)
 588{
 589	u8 i;
 590	u8 config;
 591
 592	if (!strcmp(name, "CONFIG")) {
 593		i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
 594		config = profile->default_config;
 595	} else if (tomoyo_str_starts(&name, "CONFIG::")) {
 596		config = 0;
 597		for (i = 0; i < TOMOYO_MAX_MAC_INDEX
 598			     + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
 599			int len = 0;
 600
 601			if (i < TOMOYO_MAX_MAC_INDEX) {
 602				const u8 c = tomoyo_index2category[i];
 603				const char *category =
 604					tomoyo_category_keywords[c];
 605
 606				len = strlen(category);
 607				if (strncmp(name, category, len) ||
 608				    name[len++] != ':' || name[len++] != ':')
 609					continue;
 610			}
 611			if (strcmp(name + len, tomoyo_mac_keywords[i]))
 612				continue;
 613			config = profile->config[i];
 614			break;
 615		}
 616		if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
 617			return -EINVAL;
 618	} else {
 619		return -EINVAL;
 620	}
 621	if (strstr(value, "use_default")) {
 622		config = TOMOYO_CONFIG_USE_DEFAULT;
 623	} else {
 624		u8 mode;
 625
 626		for (mode = 0; mode < 4; mode++)
 627			if (strstr(value, tomoyo_mode[mode]))
 628				/*
 629				 * Update lower 3 bits in order to distinguish
 630				 * 'config' from 'TOMOYO_CONFIG_USE_DEFAULT'.
 631				 */
 632				config = (config & ~7) | mode;
 633		if (config != TOMOYO_CONFIG_USE_DEFAULT) {
 634			switch (tomoyo_find_yesno(value, "grant_log")) {
 635			case 1:
 636				config |= TOMOYO_CONFIG_WANT_GRANT_LOG;
 637				break;
 638			case 0:
 639				config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG;
 640				break;
 641			}
 642			switch (tomoyo_find_yesno(value, "reject_log")) {
 643			case 1:
 644				config |= TOMOYO_CONFIG_WANT_REJECT_LOG;
 645				break;
 646			case 0:
 647				config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG;
 648				break;
 649			}
 650		}
 651	}
 652	if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
 653		profile->config[i] = config;
 654	else if (config != TOMOYO_CONFIG_USE_DEFAULT)
 655		profile->default_config = config;
 656	return 0;
 657}
 658
 659/**
 660 * tomoyo_write_profile - Write profile table.
 661 *
 662 * @head: Pointer to "struct tomoyo_io_buffer".
 663 *
 664 * Returns 0 on success, negative value otherwise.
 665 */
 666static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
 667{
 668	char *data = head->write_buf;
 669	unsigned int i;
 670	char *cp;
 671	struct tomoyo_profile *profile;
 672
 673	if (sscanf(data, "PROFILE_VERSION=%u", &head->w.ns->profile_version)
 674	    == 1)
 675		return 0;
 676	i = simple_strtoul(data, &cp, 10);
 677	if (*cp != '-')
 678		return -EINVAL;
 679	data = cp + 1;
 680	profile = tomoyo_assign_profile(head->w.ns, i);
 681	if (!profile)
 682		return -EINVAL;
 683	cp = strchr(data, '=');
 684	if (!cp)
 685		return -EINVAL;
 686	*cp++ = '\0';
 687	if (!strcmp(data, "COMMENT")) {
 688		static DEFINE_SPINLOCK(lock);
 689		const struct tomoyo_path_info *new_comment
 690			= tomoyo_get_name(cp);
 691		const struct tomoyo_path_info *old_comment;
 692
 693		if (!new_comment)
 694			return -ENOMEM;
 695		spin_lock(&lock);
 696		old_comment = profile->comment;
 697		profile->comment = new_comment;
 698		spin_unlock(&lock);
 699		tomoyo_put_name(old_comment);
 700		return 0;
 701	}
 702	if (!strcmp(data, "PREFERENCE")) {
 703		for (i = 0; i < TOMOYO_MAX_PREF; i++)
 704			tomoyo_set_uint(&profile->pref[i], cp,
 705					tomoyo_pref_keywords[i]);
 706		return 0;
 707	}
 708	return tomoyo_set_mode(data, cp, profile);
 709}
 710
 711/**
 712 * tomoyo_print_config - Print mode for specified functionality.
 713 *
 714 * @head:   Pointer to "struct tomoyo_io_buffer".
 715 * @config: Mode for that functionality.
 716 *
 717 * Returns nothing.
 718 *
 719 * Caller prints functionality's name.
 720 */
 721static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
 722{
 723	tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n",
 724			 tomoyo_mode[config & 3],
 725			 str_yes_no(config & TOMOYO_CONFIG_WANT_GRANT_LOG),
 726			 str_yes_no(config & TOMOYO_CONFIG_WANT_REJECT_LOG));
 727}
 728
 729/**
 730 * tomoyo_read_profile - Read profile table.
 731 *
 732 * @head: Pointer to "struct tomoyo_io_buffer".
 733 *
 734 * Returns nothing.
 735 */
 736static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
 737{
 738	u8 index;
 739	struct tomoyo_policy_namespace *ns =
 740		container_of(head->r.ns, typeof(*ns), namespace_list);
 741	const struct tomoyo_profile *profile;
 742
 743	if (head->r.eof)
 744		return;
 745 next:
 746	index = head->r.index;
 747	profile = ns->profile_ptr[index];
 748	switch (head->r.step) {
 749	case 0:
 750		tomoyo_print_namespace(head);
 751		tomoyo_io_printf(head, "PROFILE_VERSION=%u\n",
 752				 ns->profile_version);
 753		head->r.step++;
 754		break;
 755	case 1:
 756		for ( ; head->r.index < TOMOYO_MAX_PROFILES;
 757		      head->r.index++)
 758			if (ns->profile_ptr[head->r.index])
 759				break;
 760		if (head->r.index == TOMOYO_MAX_PROFILES) {
 761			head->r.eof = true;
 762			return;
 763		}
 764		head->r.step++;
 765		break;
 766	case 2:
 767		{
 768			u8 i;
 769			const struct tomoyo_path_info *comment =
 770				profile->comment;
 771
 772			tomoyo_print_namespace(head);
 773			tomoyo_io_printf(head, "%u-COMMENT=", index);
 774			tomoyo_set_string(head, comment ? comment->name : "");
 775			tomoyo_set_lf(head);
 776			tomoyo_print_namespace(head);
 777			tomoyo_io_printf(head, "%u-PREFERENCE={ ", index);
 778			for (i = 0; i < TOMOYO_MAX_PREF; i++)
 779				tomoyo_io_printf(head, "%s=%u ",
 780						 tomoyo_pref_keywords[i],
 781						 profile->pref[i]);
 782			tomoyo_set_string(head, "}\n");
 783			head->r.step++;
 784		}
 785		break;
 786	case 3:
 787		{
 788			tomoyo_print_namespace(head);
 789			tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
 790			tomoyo_print_config(head, profile->default_config);
 791			head->r.bit = 0;
 792			head->r.step++;
 793		}
 794		break;
 795	case 4:
 796		for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
 797			      + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
 798			const u8 i = head->r.bit;
 799			const u8 config = profile->config[i];
 800
 801			if (config == TOMOYO_CONFIG_USE_DEFAULT)
 802				continue;
 803			tomoyo_print_namespace(head);
 804			if (i < TOMOYO_MAX_MAC_INDEX)
 805				tomoyo_io_printf(head, "%u-CONFIG::%s::%s",
 806						 index,
 807						 tomoyo_category_keywords
 808						 [tomoyo_index2category[i]],
 809						 tomoyo_mac_keywords[i]);
 810			else
 811				tomoyo_io_printf(head, "%u-CONFIG::%s", index,
 812						 tomoyo_mac_keywords[i]);
 813			tomoyo_print_config(head, config);
 814			head->r.bit++;
 815			break;
 816		}
 817		if (head->r.bit == TOMOYO_MAX_MAC_INDEX
 818		    + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
 819			head->r.index++;
 820			head->r.step = 1;
 821		}
 822		break;
 823	}
 824	if (tomoyo_flush(head))
 825		goto next;
 826}
 827
 828/**
 829 * tomoyo_same_manager - Check for duplicated "struct tomoyo_manager" entry.
 830 *
 831 * @a: Pointer to "struct tomoyo_acl_head".
 832 * @b: Pointer to "struct tomoyo_acl_head".
 833 *
 834 * Returns true if @a == @b, false otherwise.
 835 */
 836static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
 837				const struct tomoyo_acl_head *b)
 838{
 839	return container_of(a, struct tomoyo_manager, head)->manager ==
 840		container_of(b, struct tomoyo_manager, head)->manager;
 841}
 842
 843/**
 844 * tomoyo_update_manager_entry - Add a manager entry.
 845 *
 846 * @manager:   The path to manager or the domainnamme.
 847 * @is_delete: True if it is a delete request.
 848 *
 849 * Returns 0 on success, negative value otherwise.
 850 *
 851 * Caller holds tomoyo_read_lock().
 852 */
 853static int tomoyo_update_manager_entry(const char *manager,
 854				       const bool is_delete)
 855{
 856	struct tomoyo_manager e = { };
 857	struct tomoyo_acl_param param = {
 858		/* .ns = &tomoyo_kernel_namespace, */
 859		.is_delete = is_delete,
 860		.list = &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER],
 861	};
 862	int error = is_delete ? -ENOENT : -ENOMEM;
 863
 864	if (!tomoyo_correct_domain(manager) &&
 865	    !tomoyo_correct_word(manager))
 866		return -EINVAL;
 867	e.manager = tomoyo_get_name(manager);
 868	if (e.manager) {
 869		error = tomoyo_update_policy(&e.head, sizeof(e), &param,
 870					     tomoyo_same_manager);
 871		tomoyo_put_name(e.manager);
 872	}
 873	return error;
 874}
 875
 876/**
 877 * tomoyo_write_manager - Write manager policy.
 878 *
 879 * @head: Pointer to "struct tomoyo_io_buffer".
 880 *
 881 * Returns 0 on success, negative value otherwise.
 882 *
 883 * Caller holds tomoyo_read_lock().
 884 */
 885static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
 886{
 887	char *data = head->write_buf;
 888
 889	if (!strcmp(data, "manage_by_non_root")) {
 890		tomoyo_manage_by_non_root = !head->w.is_delete;
 891		return 0;
 892	}
 893	return tomoyo_update_manager_entry(data, head->w.is_delete);
 894}
 895
 896/**
 897 * tomoyo_read_manager - Read manager policy.
 898 *
 899 * @head: Pointer to "struct tomoyo_io_buffer".
 900 *
 901 * Caller holds tomoyo_read_lock().
 902 */
 903static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
 904{
 905	if (head->r.eof)
 906		return;
 907	list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER]) {
 908		struct tomoyo_manager *ptr =
 909			list_entry(head->r.acl, typeof(*ptr), head.list);
 910
 911		if (ptr->head.is_deleted)
 912			continue;
 913		if (!tomoyo_flush(head))
 914			return;
 915		tomoyo_set_string(head, ptr->manager->name);
 916		tomoyo_set_lf(head);
 917	}
 918	head->r.eof = true;
 919}
 920
 921/**
 922 * tomoyo_manager - Check whether the current process is a policy manager.
 923 *
 924 * Returns true if the current process is permitted to modify policy
 925 * via /sys/kernel/security/tomoyo/ interface.
 926 *
 927 * Caller holds tomoyo_read_lock().
 928 */
 929static bool tomoyo_manager(void)
 930{
 931	struct tomoyo_manager *ptr;
 932	const char *exe;
 933	const struct task_struct *task = current;
 934	const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
 935	bool found = IS_ENABLED(CONFIG_SECURITY_TOMOYO_INSECURE_BUILTIN_SETTING);
 936
 937	if (!tomoyo_policy_loaded)
 938		return true;
 939	if (!tomoyo_manage_by_non_root &&
 940	    (!uid_eq(task->cred->uid,  GLOBAL_ROOT_UID) ||
 941	     !uid_eq(task->cred->euid, GLOBAL_ROOT_UID)))
 942		return false;
 943	exe = tomoyo_get_exe();
 944	if (!exe)
 945		return false;
 946	list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER], head.list,
 947				srcu_read_lock_held(&tomoyo_ss)) {
 948		if (!ptr->head.is_deleted &&
 949		    (!tomoyo_pathcmp(domainname, ptr->manager) ||
 950		     !strcmp(exe, ptr->manager->name))) {
 951			found = true;
 952			break;
 953		}
 954	}
 955	if (!found) { /* Reduce error messages. */
 956		static pid_t last_pid;
 957		const pid_t pid = current->pid;
 958
 959		if (last_pid != pid) {
 960			pr_warn("%s ( %s ) is not permitted to update policies.\n",
 961				domainname->name, exe);
 962			last_pid = pid;
 963		}
 964	}
 965	kfree(exe);
 966	return found;
 967}
 968
 969static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
 970(unsigned int serial);
 971
 972/**
 973 * tomoyo_select_domain - Parse select command.
 974 *
 975 * @head: Pointer to "struct tomoyo_io_buffer".
 976 * @data: String to parse.
 977 *
 978 * Returns true on success, false otherwise.
 979 *
 980 * Caller holds tomoyo_read_lock().
 981 */
 982static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
 983				 const char *data)
 984{
 985	unsigned int pid;
 986	struct tomoyo_domain_info *domain = NULL;
 987	bool global_pid = false;
 988
 989	if (strncmp(data, "select ", 7))
 990		return false;
 991	data += 7;
 992	if (sscanf(data, "pid=%u", &pid) == 1 ||
 993	    (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
 994		struct task_struct *p;
 995
 996		rcu_read_lock();
 997		if (global_pid)
 998			p = find_task_by_pid_ns(pid, &init_pid_ns);
 999		else
1000			p = find_task_by_vpid(pid);
1001		if (p)
1002			domain = tomoyo_task(p)->domain_info;
1003		rcu_read_unlock();
1004	} else if (!strncmp(data, "domain=", 7)) {
1005		if (tomoyo_domain_def(data + 7))
1006			domain = tomoyo_find_domain(data + 7);
1007	} else if (sscanf(data, "Q=%u", &pid) == 1) {
1008		domain = tomoyo_find_domain_by_qid(pid);
1009	} else
1010		return false;
1011	head->w.domain = domain;
1012	/* Accessing read_buf is safe because head->io_sem is held. */
1013	if (!head->read_buf)
1014		return true; /* Do nothing if open(O_WRONLY). */
1015	memset(&head->r, 0, sizeof(head->r));
1016	head->r.print_this_domain_only = true;
1017	if (domain)
1018		head->r.domain = &domain->list;
1019	else
1020		head->r.eof = true;
1021	tomoyo_io_printf(head, "# select %s\n", data);
1022	if (domain && domain->is_deleted)
1023		tomoyo_io_printf(head, "# This is a deleted domain.\n");
1024	return true;
1025}
1026
1027/**
1028 * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry.
1029 *
1030 * @a: Pointer to "struct tomoyo_acl_info".
1031 * @b: Pointer to "struct tomoyo_acl_info".
1032 *
1033 * Returns true if @a == @b, false otherwise.
1034 */
1035static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a,
1036				 const struct tomoyo_acl_info *b)
1037{
1038	const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head);
1039	const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head);
1040
1041	return p1->domainname == p2->domainname;
1042}
1043
1044/**
1045 * tomoyo_write_task - Update task related list.
1046 *
1047 * @param: Pointer to "struct tomoyo_acl_param".
1048 *
1049 * Returns 0 on success, negative value otherwise.
1050 *
1051 * Caller holds tomoyo_read_lock().
1052 */
1053static int tomoyo_write_task(struct tomoyo_acl_param *param)
1054{
1055	int error = -EINVAL;
1056
1057	if (tomoyo_str_starts(&param->data, "manual_domain_transition ")) {
1058		struct tomoyo_task_acl e = {
1059			.head.type = TOMOYO_TYPE_MANUAL_TASK_ACL,
1060			.domainname = tomoyo_get_domainname(param),
1061		};
1062
1063		if (e.domainname)
1064			error = tomoyo_update_domain(&e.head, sizeof(e), param,
1065						     tomoyo_same_task_acl,
1066						     NULL);
1067		tomoyo_put_name(e.domainname);
1068	}
1069	return error;
1070}
1071
1072/**
1073 * tomoyo_delete_domain - Delete a domain.
1074 *
1075 * @domainname: The name of domain.
1076 *
1077 * Returns 0 on success, negative value otherwise.
1078 *
1079 * Caller holds tomoyo_read_lock().
1080 */
1081static int tomoyo_delete_domain(char *domainname)
1082{
1083	struct tomoyo_domain_info *domain;
1084	struct tomoyo_path_info name;
1085
1086	name.name = domainname;
1087	tomoyo_fill_path_info(&name);
1088	if (mutex_lock_interruptible(&tomoyo_policy_lock))
1089		return -EINTR;
1090	/* Is there an active domain? */
1091	list_for_each_entry_rcu(domain, &tomoyo_domain_list, list,
1092				srcu_read_lock_held(&tomoyo_ss)) {
1093		/* Never delete tomoyo_kernel_domain */
1094		if (domain == &tomoyo_kernel_domain)
1095			continue;
1096		if (domain->is_deleted ||
1097		    tomoyo_pathcmp(domain->domainname, &name))
1098			continue;
1099		domain->is_deleted = true;
1100		break;
1101	}
1102	mutex_unlock(&tomoyo_policy_lock);
1103	return 0;
1104}
1105
1106/**
1107 * tomoyo_write_domain2 - Write domain policy.
1108 *
1109 * @ns:        Pointer to "struct tomoyo_policy_namespace".
1110 * @list:      Pointer to "struct list_head".
1111 * @data:      Policy to be interpreted.
1112 * @is_delete: True if it is a delete request.
1113 *
1114 * Returns 0 on success, negative value otherwise.
1115 *
1116 * Caller holds tomoyo_read_lock().
1117 */
1118static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
1119				struct list_head *list, char *data,
1120				const bool is_delete)
1121{
1122	struct tomoyo_acl_param param = {
1123		.ns = ns,
1124		.list = list,
1125		.data = data,
1126		.is_delete = is_delete,
1127	};
1128	static const struct {
1129		const char *keyword;
1130		int (*write)(struct tomoyo_acl_param *param);
1131	} tomoyo_callback[5] = {
1132		{ "file ", tomoyo_write_file },
1133		{ "network inet ", tomoyo_write_inet_network },
1134		{ "network unix ", tomoyo_write_unix_network },
1135		{ "misc ", tomoyo_write_misc },
1136		{ "task ", tomoyo_write_task },
1137	};
1138	u8 i;
1139
1140	for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) {
1141		if (!tomoyo_str_starts(&param.data,
1142				       tomoyo_callback[i].keyword))
1143			continue;
1144		return tomoyo_callback[i].write(&param);
1145	}
1146	return -EINVAL;
1147}
1148
1149/* String table for domain flags. */
1150const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1151	[TOMOYO_DIF_QUOTA_WARNED]      = "quota_exceeded\n",
1152	[TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1153};
1154
1155/**
1156 * tomoyo_write_domain - Write domain policy.
1157 *
1158 * @head: Pointer to "struct tomoyo_io_buffer".
1159 *
1160 * Returns 0 on success, negative value otherwise.
1161 *
1162 * Caller holds tomoyo_read_lock().
1163 */
1164static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1165{
1166	char *data = head->write_buf;
1167	struct tomoyo_policy_namespace *ns;
1168	struct tomoyo_domain_info *domain = head->w.domain;
1169	const bool is_delete = head->w.is_delete;
1170	bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1171	unsigned int idx;
1172
1173	if (*data == '<') {
1174		int ret = 0;
1175
1176		domain = NULL;
1177		if (is_delete)
1178			ret = tomoyo_delete_domain(data);
1179		else if (is_select)
1180			domain = tomoyo_find_domain(data);
1181		else
1182			domain = tomoyo_assign_domain(data, false);
1183		head->w.domain = domain;
1184		return ret;
1185	}
1186	if (!domain)
1187		return -EINVAL;
1188	ns = domain->ns;
1189	if (sscanf(data, "use_profile %u", &idx) == 1
1190	    && idx < TOMOYO_MAX_PROFILES) {
1191		if (!tomoyo_policy_loaded || ns->profile_ptr[idx])
1192			if (!is_delete)
1193				domain->profile = (u8) idx;
1194		return 0;
1195	}
1196	if (sscanf(data, "use_group %u\n", &idx) == 1
1197	    && idx < TOMOYO_MAX_ACL_GROUPS) {
1198		if (!is_delete)
1199			set_bit(idx, domain->group);
1200		else
1201			clear_bit(idx, domain->group);
1202		return 0;
1203	}
1204	for (idx = 0; idx < TOMOYO_MAX_DOMAIN_INFO_FLAGS; idx++) {
1205		const char *cp = tomoyo_dif[idx];
1206
1207		if (strncmp(data, cp, strlen(cp) - 1))
1208			continue;
1209		domain->flags[idx] = !is_delete;
1210		return 0;
1211	}
1212	return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1213				    is_delete);
1214}
1215
1216/**
1217 * tomoyo_print_condition - Print condition part.
1218 *
1219 * @head: Pointer to "struct tomoyo_io_buffer".
1220 * @cond: Pointer to "struct tomoyo_condition".
1221 *
1222 * Returns true on success, false otherwise.
1223 */
1224static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1225				   const struct tomoyo_condition *cond)
1226{
1227	switch (head->r.cond_step) {
1228	case 0:
1229		head->r.cond_index = 0;
1230		head->r.cond_step++;
1231		if (cond->transit) {
1232			tomoyo_set_space(head);
1233			tomoyo_set_string(head, cond->transit->name);
1234		}
1235		fallthrough;
1236	case 1:
1237		{
1238			const u16 condc = cond->condc;
1239			const struct tomoyo_condition_element *condp =
1240				(typeof(condp)) (cond + 1);
1241			const struct tomoyo_number_union *numbers_p =
1242				(typeof(numbers_p)) (condp + condc);
1243			const struct tomoyo_name_union *names_p =
1244				(typeof(names_p))
1245				(numbers_p + cond->numbers_count);
1246			const struct tomoyo_argv *argv =
1247				(typeof(argv)) (names_p + cond->names_count);
1248			const struct tomoyo_envp *envp =
1249				(typeof(envp)) (argv + cond->argc);
1250			u16 skip;
1251
1252			for (skip = 0; skip < head->r.cond_index; skip++) {
1253				const u8 left = condp->left;
1254				const u8 right = condp->right;
1255
1256				condp++;
1257				switch (left) {
1258				case TOMOYO_ARGV_ENTRY:
1259					argv++;
1260					continue;
1261				case TOMOYO_ENVP_ENTRY:
1262					envp++;
1263					continue;
1264				case TOMOYO_NUMBER_UNION:
1265					numbers_p++;
1266					break;
1267				}
1268				switch (right) {
1269				case TOMOYO_NAME_UNION:
1270					names_p++;
1271					break;
1272				case TOMOYO_NUMBER_UNION:
1273					numbers_p++;
1274					break;
1275				}
1276			}
1277			while (head->r.cond_index < condc) {
1278				const u8 match = condp->equals;
1279				const u8 left = condp->left;
1280				const u8 right = condp->right;
1281
1282				if (!tomoyo_flush(head))
1283					return false;
1284				condp++;
1285				head->r.cond_index++;
1286				tomoyo_set_space(head);
1287				switch (left) {
1288				case TOMOYO_ARGV_ENTRY:
1289					tomoyo_io_printf(head,
1290							 "exec.argv[%lu]%s=\"",
1291							 argv->index, argv->is_not ? "!" : "");
1292					tomoyo_set_string(head,
1293							  argv->value->name);
1294					tomoyo_set_string(head, "\"");
1295					argv++;
1296					continue;
1297				case TOMOYO_ENVP_ENTRY:
1298					tomoyo_set_string(head,
1299							  "exec.envp[\"");
1300					tomoyo_set_string(head,
1301							  envp->name->name);
1302					tomoyo_io_printf(head, "\"]%s=", envp->is_not ? "!" : "");
1303					if (envp->value) {
1304						tomoyo_set_string(head, "\"");
1305						tomoyo_set_string(head, envp->value->name);
1306						tomoyo_set_string(head, "\"");
1307					} else {
1308						tomoyo_set_string(head,
1309								  "NULL");
1310					}
1311					envp++;
1312					continue;
1313				case TOMOYO_NUMBER_UNION:
1314					tomoyo_print_number_union_nospace
1315						(head, numbers_p++);
1316					break;
1317				default:
1318					tomoyo_set_string(head,
1319					       tomoyo_condition_keyword[left]);
1320					break;
1321				}
1322				tomoyo_set_string(head, match ? "=" : "!=");
1323				switch (right) {
1324				case TOMOYO_NAME_UNION:
1325					tomoyo_print_name_union_quoted
1326						(head, names_p++);
1327					break;
1328				case TOMOYO_NUMBER_UNION:
1329					tomoyo_print_number_union_nospace
1330						(head, numbers_p++);
1331					break;
1332				default:
1333					tomoyo_set_string(head,
1334					  tomoyo_condition_keyword[right]);
1335					break;
1336				}
1337			}
1338		}
1339		head->r.cond_step++;
1340		fallthrough;
1341	case 2:
1342		if (!tomoyo_flush(head))
1343			break;
1344		head->r.cond_step++;
1345		fallthrough;
1346	case 3:
1347		if (cond->grant_log != TOMOYO_GRANTLOG_AUTO)
1348			tomoyo_io_printf(head, " grant_log=%s",
1349					 str_yes_no(cond->grant_log ==
1350						    TOMOYO_GRANTLOG_YES));
1351		tomoyo_set_lf(head);
1352		return true;
1353	}
1354	return false;
1355}
1356
1357/**
1358 * tomoyo_set_group - Print "acl_group " header keyword and category name.
1359 *
1360 * @head:     Pointer to "struct tomoyo_io_buffer".
1361 * @category: Category name.
1362 *
1363 * Returns nothing.
1364 */
1365static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1366			     const char *category)
1367{
1368	if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1369		tomoyo_print_namespace(head);
1370		tomoyo_io_printf(head, "acl_group %u ",
1371				 head->r.acl_group_index);
1372	}
1373	tomoyo_set_string(head, category);
1374}
1375
1376/**
1377 * tomoyo_print_entry - Print an ACL entry.
1378 *
1379 * @head: Pointer to "struct tomoyo_io_buffer".
1380 * @acl:  Pointer to an ACL entry.
1381 *
1382 * Returns true on success, false otherwise.
1383 */
1384static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1385			       struct tomoyo_acl_info *acl)
1386{
1387	const u8 acl_type = acl->type;
1388	bool first = true;
1389	u8 bit;
1390
1391	if (head->r.print_cond_part)
1392		goto print_cond_part;
1393	if (acl->is_deleted)
1394		return true;
1395	if (!tomoyo_flush(head))
1396		return false;
1397	else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1398		struct tomoyo_path_acl *ptr =
1399			container_of(acl, typeof(*ptr), head);
1400		const u16 perm = ptr->perm;
1401
1402		for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1403			if (!(perm & (1 << bit)))
1404				continue;
1405			if (head->r.print_transition_related_only &&
1406			    bit != TOMOYO_TYPE_EXECUTE)
1407				continue;
1408			if (first) {
1409				tomoyo_set_group(head, "file ");
1410				first = false;
1411			} else {
1412				tomoyo_set_slash(head);
1413			}
1414			tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1415		}
1416		if (first)
1417			return true;
1418		tomoyo_print_name_union(head, &ptr->name);
1419	} else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) {
1420		struct tomoyo_task_acl *ptr =
1421			container_of(acl, typeof(*ptr), head);
1422
1423		tomoyo_set_group(head, "task ");
1424		tomoyo_set_string(head, "manual_domain_transition ");
1425		tomoyo_set_string(head, ptr->domainname->name);
1426	} else if (head->r.print_transition_related_only) {
1427		return true;
1428	} else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1429		struct tomoyo_path2_acl *ptr =
1430			container_of(acl, typeof(*ptr), head);
1431		const u8 perm = ptr->perm;
1432
1433		for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1434			if (!(perm & (1 << bit)))
1435				continue;
1436			if (first) {
1437				tomoyo_set_group(head, "file ");
1438				first = false;
1439			} else {
1440				tomoyo_set_slash(head);
1441			}
1442			tomoyo_set_string(head, tomoyo_mac_keywords
1443					  [tomoyo_pp2mac[bit]]);
1444		}
1445		if (first)
1446			return true;
1447		tomoyo_print_name_union(head, &ptr->name1);
1448		tomoyo_print_name_union(head, &ptr->name2);
1449	} else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1450		struct tomoyo_path_number_acl *ptr =
1451			container_of(acl, typeof(*ptr), head);
1452		const u8 perm = ptr->perm;
1453
1454		for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1455			if (!(perm & (1 << bit)))
1456				continue;
1457			if (first) {
1458				tomoyo_set_group(head, "file ");
1459				first = false;
1460			} else {
1461				tomoyo_set_slash(head);
1462			}
1463			tomoyo_set_string(head, tomoyo_mac_keywords
1464					  [tomoyo_pn2mac[bit]]);
1465		}
1466		if (first)
1467			return true;
1468		tomoyo_print_name_union(head, &ptr->name);
1469		tomoyo_print_number_union(head, &ptr->number);
1470	} else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1471		struct tomoyo_mkdev_acl *ptr =
1472			container_of(acl, typeof(*ptr), head);
1473		const u8 perm = ptr->perm;
1474
1475		for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1476			if (!(perm & (1 << bit)))
1477				continue;
1478			if (first) {
1479				tomoyo_set_group(head, "file ");
1480				first = false;
1481			} else {
1482				tomoyo_set_slash(head);
1483			}
1484			tomoyo_set_string(head, tomoyo_mac_keywords
1485					  [tomoyo_pnnn2mac[bit]]);
1486		}
1487		if (first)
1488			return true;
1489		tomoyo_print_name_union(head, &ptr->name);
1490		tomoyo_print_number_union(head, &ptr->mode);
1491		tomoyo_print_number_union(head, &ptr->major);
1492		tomoyo_print_number_union(head, &ptr->minor);
1493	} else if (acl_type == TOMOYO_TYPE_INET_ACL) {
1494		struct tomoyo_inet_acl *ptr =
1495			container_of(acl, typeof(*ptr), head);
1496		const u8 perm = ptr->perm;
1497
1498		for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1499			if (!(perm & (1 << bit)))
1500				continue;
1501			if (first) {
1502				tomoyo_set_group(head, "network inet ");
1503				tomoyo_set_string(head, tomoyo_proto_keyword
1504						  [ptr->protocol]);
1505				tomoyo_set_space(head);
1506				first = false;
1507			} else {
1508				tomoyo_set_slash(head);
1509			}
1510			tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1511		}
1512		if (first)
1513			return true;
1514		tomoyo_set_space(head);
1515		if (ptr->address.group) {
1516			tomoyo_set_string(head, "@");
1517			tomoyo_set_string(head, ptr->address.group->group_name
1518					  ->name);
1519		} else {
1520			char buf[128];
1521
1522			tomoyo_print_ip(buf, sizeof(buf), &ptr->address);
1523			tomoyo_io_printf(head, "%s", buf);
1524		}
1525		tomoyo_print_number_union(head, &ptr->port);
1526	} else if (acl_type == TOMOYO_TYPE_UNIX_ACL) {
1527		struct tomoyo_unix_acl *ptr =
1528			container_of(acl, typeof(*ptr), head);
1529		const u8 perm = ptr->perm;
1530
1531		for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1532			if (!(perm & (1 << bit)))
1533				continue;
1534			if (first) {
1535				tomoyo_set_group(head, "network unix ");
1536				tomoyo_set_string(head, tomoyo_proto_keyword
1537						  [ptr->protocol]);
1538				tomoyo_set_space(head);
1539				first = false;
1540			} else {
1541				tomoyo_set_slash(head);
1542			}
1543			tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1544		}
1545		if (first)
1546			return true;
1547		tomoyo_print_name_union(head, &ptr->name);
1548	} else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1549		struct tomoyo_mount_acl *ptr =
1550			container_of(acl, typeof(*ptr), head);
1551
1552		tomoyo_set_group(head, "file mount");
1553		tomoyo_print_name_union(head, &ptr->dev_name);
1554		tomoyo_print_name_union(head, &ptr->dir_name);
1555		tomoyo_print_name_union(head, &ptr->fs_type);
1556		tomoyo_print_number_union(head, &ptr->flags);
1557	} else if (acl_type == TOMOYO_TYPE_ENV_ACL) {
1558		struct tomoyo_env_acl *ptr =
1559			container_of(acl, typeof(*ptr), head);
1560
1561		tomoyo_set_group(head, "misc env ");
1562		tomoyo_set_string(head, ptr->env->name);
1563	}
1564	if (acl->cond) {
1565		head->r.print_cond_part = true;
1566		head->r.cond_step = 0;
1567		if (!tomoyo_flush(head))
1568			return false;
1569print_cond_part:
1570		if (!tomoyo_print_condition(head, acl->cond))
1571			return false;
1572		head->r.print_cond_part = false;
1573	} else {
1574		tomoyo_set_lf(head);
1575	}
1576	return true;
1577}
1578
1579/**
1580 * tomoyo_read_domain2 - Read domain policy.
1581 *
1582 * @head: Pointer to "struct tomoyo_io_buffer".
1583 * @list: Pointer to "struct list_head".
1584 *
1585 * Caller holds tomoyo_read_lock().
1586 *
1587 * Returns true on success, false otherwise.
1588 */
1589static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1590				struct list_head *list)
1591{
1592	list_for_each_cookie(head->r.acl, list) {
1593		struct tomoyo_acl_info *ptr =
1594			list_entry(head->r.acl, typeof(*ptr), list);
1595
1596		if (!tomoyo_print_entry(head, ptr))
1597			return false;
1598	}
1599	head->r.acl = NULL;
1600	return true;
1601}
1602
1603/**
1604 * tomoyo_read_domain - Read domain policy.
1605 *
1606 * @head: Pointer to "struct tomoyo_io_buffer".
1607 *
1608 * Caller holds tomoyo_read_lock().
1609 */
1610static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1611{
1612	if (head->r.eof)
1613		return;
1614	list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1615		struct tomoyo_domain_info *domain =
1616			list_entry(head->r.domain, typeof(*domain), list);
1617		u8 i;
1618
1619		switch (head->r.step) {
1620		case 0:
1621			if (domain->is_deleted &&
1622			    !head->r.print_this_domain_only)
1623				continue;
1624			/* Print domainname and flags. */
1625			tomoyo_set_string(head, domain->domainname->name);
1626			tomoyo_set_lf(head);
1627			tomoyo_io_printf(head, "use_profile %u\n",
1628					 domain->profile);
1629			for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1630				if (domain->flags[i])
1631					tomoyo_set_string(head, tomoyo_dif[i]);
1632			head->r.index = 0;
1633			head->r.step++;
1634			fallthrough;
1635		case 1:
1636			while (head->r.index < TOMOYO_MAX_ACL_GROUPS) {
1637				i = head->r.index++;
1638				if (!test_bit(i, domain->group))
1639					continue;
1640				tomoyo_io_printf(head, "use_group %u\n", i);
1641				if (!tomoyo_flush(head))
1642					return;
1643			}
1644			head->r.index = 0;
1645			head->r.step++;
1646			tomoyo_set_lf(head);
1647			fallthrough;
1648		case 2:
1649			if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1650				return;
1651			head->r.step++;
1652			if (!tomoyo_set_lf(head))
1653				return;
1654			fallthrough;
1655		case 3:
1656			head->r.step = 0;
1657			if (head->r.print_this_domain_only)
1658				goto done;
1659		}
1660	}
1661 done:
1662	head->r.eof = true;
1663}
1664
1665/**
1666 * tomoyo_write_pid: Specify PID to obtain domainname.
1667 *
1668 * @head: Pointer to "struct tomoyo_io_buffer".
1669 *
1670 * Returns 0.
1671 */
1672static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1673{
1674	head->r.eof = false;
1675	return 0;
1676}
1677
1678/**
1679 * tomoyo_read_pid - Get domainname of the specified PID.
1680 *
1681 * @head: Pointer to "struct tomoyo_io_buffer".
1682 *
1683 * Returns the domainname which the specified PID is in on success,
1684 * empty string otherwise.
1685 * The PID is specified by tomoyo_write_pid() so that the user can obtain
1686 * using read()/write() interface rather than sysctl() interface.
1687 */
1688static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1689{
1690	char *buf = head->write_buf;
1691	bool global_pid = false;
1692	unsigned int pid;
1693	struct task_struct *p;
1694	struct tomoyo_domain_info *domain = NULL;
1695
1696	/* Accessing write_buf is safe because head->io_sem is held. */
1697	if (!buf) {
1698		head->r.eof = true;
1699		return; /* Do nothing if open(O_RDONLY). */
1700	}
1701	if (head->r.w_pos || head->r.eof)
1702		return;
1703	head->r.eof = true;
1704	if (tomoyo_str_starts(&buf, "global-pid "))
1705		global_pid = true;
1706	if (kstrtouint(buf, 10, &pid))
1707		return;
1708	rcu_read_lock();
1709	if (global_pid)
1710		p = find_task_by_pid_ns(pid, &init_pid_ns);
1711	else
1712		p = find_task_by_vpid(pid);
1713	if (p)
1714		domain = tomoyo_task(p)->domain_info;
1715	rcu_read_unlock();
1716	if (!domain)
1717		return;
1718	tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1719	tomoyo_set_string(head, domain->domainname->name);
1720}
1721
1722/* String table for domain transition control keywords. */
1723static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1724	[TOMOYO_TRANSITION_CONTROL_NO_RESET]      = "no_reset_domain ",
1725	[TOMOYO_TRANSITION_CONTROL_RESET]         = "reset_domain ",
1726	[TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1727	[TOMOYO_TRANSITION_CONTROL_INITIALIZE]    = "initialize_domain ",
1728	[TOMOYO_TRANSITION_CONTROL_NO_KEEP]       = "no_keep_domain ",
1729	[TOMOYO_TRANSITION_CONTROL_KEEP]          = "keep_domain ",
1730};
1731
1732/* String table for grouping keywords. */
1733static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1734	[TOMOYO_PATH_GROUP]    = "path_group ",
1735	[TOMOYO_NUMBER_GROUP]  = "number_group ",
1736	[TOMOYO_ADDRESS_GROUP] = "address_group ",
1737};
1738
1739/**
1740 * tomoyo_write_exception - Write exception policy.
1741 *
1742 * @head: Pointer to "struct tomoyo_io_buffer".
1743 *
1744 * Returns 0 on success, negative value otherwise.
1745 *
1746 * Caller holds tomoyo_read_lock().
1747 */
1748static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1749{
1750	const bool is_delete = head->w.is_delete;
1751	struct tomoyo_acl_param param = {
1752		.ns = head->w.ns,
1753		.is_delete = is_delete,
1754		.data = head->write_buf,
1755	};
1756	u8 i;
1757
1758	if (tomoyo_str_starts(&param.data, "aggregator "))
1759		return tomoyo_write_aggregator(&param);
1760	for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1761		if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
1762			return tomoyo_write_transition_control(&param, i);
1763	for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1764		if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
1765			return tomoyo_write_group(&param, i);
1766	if (tomoyo_str_starts(&param.data, "acl_group ")) {
1767		unsigned int group;
1768		char *data;
1769
1770		group = simple_strtoul(param.data, &data, 10);
1771		if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1772			return tomoyo_write_domain2
1773				(head->w.ns, &head->w.ns->acl_group[group],
1774				 data, is_delete);
1775	}
1776	return -EINVAL;
1777}
1778
1779/**
1780 * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
1781 *
1782 * @head: Pointer to "struct tomoyo_io_buffer".
1783 * @idx:  Index number.
1784 *
1785 * Returns true on success, false otherwise.
1786 *
1787 * Caller holds tomoyo_read_lock().
1788 */
1789static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1790{
1791	struct tomoyo_policy_namespace *ns =
1792		container_of(head->r.ns, typeof(*ns), namespace_list);
1793	struct list_head *list = &ns->group_list[idx];
1794
1795	list_for_each_cookie(head->r.group, list) {
1796		struct tomoyo_group *group =
1797			list_entry(head->r.group, typeof(*group), head.list);
1798
1799		list_for_each_cookie(head->r.acl, &group->member_list) {
1800			struct tomoyo_acl_head *ptr =
1801				list_entry(head->r.acl, typeof(*ptr), list);
1802
1803			if (ptr->is_deleted)
1804				continue;
1805			if (!tomoyo_flush(head))
1806				return false;
1807			tomoyo_print_namespace(head);
1808			tomoyo_set_string(head, tomoyo_group_name[idx]);
1809			tomoyo_set_string(head, group->group_name->name);
1810			if (idx == TOMOYO_PATH_GROUP) {
1811				tomoyo_set_space(head);
1812				tomoyo_set_string(head, container_of
1813					       (ptr, struct tomoyo_path_group,
1814						head)->member_name->name);
1815			} else if (idx == TOMOYO_NUMBER_GROUP) {
1816				tomoyo_print_number_union(head, &container_of
1817							  (ptr,
1818						   struct tomoyo_number_group,
1819							   head)->number);
1820			} else if (idx == TOMOYO_ADDRESS_GROUP) {
1821				char buffer[128];
1822				struct tomoyo_address_group *member =
1823					container_of(ptr, typeof(*member),
1824						     head);
1825
1826				tomoyo_print_ip(buffer, sizeof(buffer),
1827						&member->address);
1828				tomoyo_io_printf(head, " %s", buffer);
1829			}
1830			tomoyo_set_lf(head);
1831		}
1832		head->r.acl = NULL;
1833	}
1834	head->r.group = NULL;
1835	return true;
1836}
1837
1838/**
1839 * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1840 *
1841 * @head: Pointer to "struct tomoyo_io_buffer".
1842 * @idx:  Index number.
1843 *
1844 * Returns true on success, false otherwise.
1845 *
1846 * Caller holds tomoyo_read_lock().
1847 */
1848static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1849{
1850	struct tomoyo_policy_namespace *ns =
1851		container_of(head->r.ns, typeof(*ns), namespace_list);
1852	struct list_head *list = &ns->policy_list[idx];
1853
1854	list_for_each_cookie(head->r.acl, list) {
1855		struct tomoyo_acl_head *acl =
1856			container_of(head->r.acl, typeof(*acl), list);
1857		if (acl->is_deleted)
1858			continue;
1859		if (!tomoyo_flush(head))
1860			return false;
1861		switch (idx) {
1862		case TOMOYO_ID_TRANSITION_CONTROL:
1863			{
1864				struct tomoyo_transition_control *ptr =
1865					container_of(acl, typeof(*ptr), head);
1866
1867				tomoyo_print_namespace(head);
1868				tomoyo_set_string(head, tomoyo_transition_type
1869						  [ptr->type]);
1870				tomoyo_set_string(head, ptr->program ?
1871						  ptr->program->name : "any");
1872				tomoyo_set_string(head, " from ");
1873				tomoyo_set_string(head, ptr->domainname ?
1874						  ptr->domainname->name :
1875						  "any");
1876			}
1877			break;
1878		case TOMOYO_ID_AGGREGATOR:
1879			{
1880				struct tomoyo_aggregator *ptr =
1881					container_of(acl, typeof(*ptr), head);
1882
1883				tomoyo_print_namespace(head);
1884				tomoyo_set_string(head, "aggregator ");
1885				tomoyo_set_string(head,
1886						  ptr->original_name->name);
1887				tomoyo_set_space(head);
1888				tomoyo_set_string(head,
1889					       ptr->aggregated_name->name);
1890			}
1891			break;
1892		default:
1893			continue;
1894		}
1895		tomoyo_set_lf(head);
1896	}
1897	head->r.acl = NULL;
1898	return true;
1899}
1900
1901/**
1902 * tomoyo_read_exception - Read exception policy.
1903 *
1904 * @head: Pointer to "struct tomoyo_io_buffer".
1905 *
1906 * Caller holds tomoyo_read_lock().
1907 */
1908static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1909{
1910	struct tomoyo_policy_namespace *ns =
1911		container_of(head->r.ns, typeof(*ns), namespace_list);
1912
1913	if (head->r.eof)
1914		return;
1915	while (head->r.step < TOMOYO_MAX_POLICY &&
1916	       tomoyo_read_policy(head, head->r.step))
1917		head->r.step++;
1918	if (head->r.step < TOMOYO_MAX_POLICY)
1919		return;
1920	while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1921	       tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1922		head->r.step++;
1923	if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1924		return;
1925	while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1926	       + TOMOYO_MAX_ACL_GROUPS) {
1927		head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1928			- TOMOYO_MAX_GROUP;
1929		if (!tomoyo_read_domain2(head, &ns->acl_group
1930					 [head->r.acl_group_index]))
1931			return;
1932		head->r.step++;
1933	}
1934	head->r.eof = true;
1935}
1936
1937/* Wait queue for kernel -> userspace notification. */
1938static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1939/* Wait queue for userspace -> kernel notification. */
1940static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1941
1942/* Structure for query. */
1943struct tomoyo_query {
1944	struct list_head list;
1945	struct tomoyo_domain_info *domain;
1946	char *query;
1947	size_t query_len;
1948	unsigned int serial;
1949	u8 timer;
1950	u8 answer;
1951	u8 retry;
1952};
1953
1954/* The list for "struct tomoyo_query". */
1955static LIST_HEAD(tomoyo_query_list);
1956
1957/* Lock for manipulating tomoyo_query_list. */
1958static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1959
1960/*
1961 * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1962 * interface.
1963 */
1964static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1965
1966/**
1967 * tomoyo_truncate - Truncate a line.
1968 *
1969 * @str: String to truncate.
1970 *
1971 * Returns length of truncated @str.
1972 */
1973static int tomoyo_truncate(char *str)
1974{
1975	char *start = str;
1976
1977	while (*(unsigned char *) str > (unsigned char) ' ')
1978		str++;
1979	*str = '\0';
1980	return strlen(start) + 1;
1981}
1982
1983/**
1984 * tomoyo_numscan - sscanf() which stores the length of a decimal integer value.
1985 *
1986 * @str:   String to scan.
1987 * @head:  Leading string that must start with.
1988 * @width: Pointer to "int" for storing length of a decimal integer value after @head.
1989 * @tail:  Optional character that must match after a decimal integer value.
1990 *
1991 * Returns whether @str starts with @head and a decimal value follows @head.
1992 */
1993static bool tomoyo_numscan(const char *str, const char *head, int *width, const char tail)
1994{
1995	const char *cp;
1996	const int n = strlen(head);
1997
1998	if (!strncmp(str, head, n)) {
1999		cp = str + n;
2000		while (*cp && *cp >= '0' && *cp <= '9')
2001			cp++;
2002		if (*cp == tail || !tail) {
2003			*width = cp - (str + n);
2004			return *width != 0;
2005		}
2006	}
2007	*width = 0;
2008	return 0;
2009}
2010
2011/**
2012 * tomoyo_patternize_path - Make patterns for file path. Used by learning mode.
2013 *
2014 * @buffer: Destination buffer.
2015 * @len:    Size of @buffer.
2016 * @entry:  Original line.
2017 *
2018 * Returns nothing.
2019 */
2020static void tomoyo_patternize_path(char *buffer, const int len, char *entry)
2021{
2022	int width;
2023	char *cp = entry;
2024
2025	/* Nothing to do if this line is not for "file" related entry. */
2026	if (strncmp(entry, "file ", 5))
2027		goto flush;
2028	/*
2029	 * Nothing to do if there is no colon in this line, for this rewriting
2030	 * applies to only filesystems where numeric values in the path are volatile.
2031	 */
2032	cp = strchr(entry + 5, ':');
2033	if (!cp) {
2034		cp = entry;
2035		goto flush;
2036	}
2037	/* Flush e.g. "file ioctl" part. */
2038	while (*cp != ' ')
2039		cp--;
2040	*cp++ = '\0';
2041	tomoyo_addprintf(buffer, len, "%s ", entry);
2042	/* e.g. file ioctl pipe:[$INO] $CMD */
2043	if (tomoyo_numscan(cp, "pipe:[", &width, ']')) {
2044		cp += width + 7;
2045		tomoyo_addprintf(buffer, len, "pipe:[\\$]");
2046		goto flush;
2047	}
2048	/* e.g. file ioctl socket:[$INO] $CMD */
2049	if (tomoyo_numscan(cp, "socket:[", &width, ']')) {
2050		cp += width + 9;
2051		tomoyo_addprintf(buffer, len, "socket:[\\$]");
2052		goto flush;
2053	}
2054	if (!strncmp(cp, "proc:/self", 10)) {
2055		/* e.g. file read proc:/self/task/$TID/fdinfo/$FD */
2056		cp += 10;
2057		tomoyo_addprintf(buffer, len, "proc:/self");
2058	} else if (tomoyo_numscan(cp, "proc:/", &width, 0)) {
2059		/* e.g. file read proc:/$PID/task/$TID/fdinfo/$FD */
2060		/*
2061		 * Don't patternize $PID part if $PID == 1, for several
2062		 * programs access only files in /proc/1/ directory.
2063		 */
2064		cp += width + 6;
2065		if (width == 1 && *(cp - 1) == '1')
2066			tomoyo_addprintf(buffer, len, "proc:/1");
2067		else
2068			tomoyo_addprintf(buffer, len, "proc:/\\$");
2069	} else {
2070		goto flush;
2071	}
2072	/* Patternize $TID part if "/task/" follows. */
2073	if (tomoyo_numscan(cp, "/task/", &width, 0)) {
2074		cp += width + 6;
2075		tomoyo_addprintf(buffer, len, "/task/\\$");
2076	}
2077	/* Patternize $FD part if "/fd/" or "/fdinfo/" follows. */
2078	if (tomoyo_numscan(cp, "/fd/", &width, 0)) {
2079		cp += width + 4;
2080		tomoyo_addprintf(buffer, len, "/fd/\\$");
2081	} else if (tomoyo_numscan(cp, "/fdinfo/", &width, 0)) {
2082		cp += width + 8;
2083		tomoyo_addprintf(buffer, len, "/fdinfo/\\$");
2084	}
2085flush:
2086	/* Flush remaining part if any. */
2087	if (*cp)
2088		tomoyo_addprintf(buffer, len, "%s", cp);
2089}
2090
2091/**
2092 * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
2093 *
2094 * @domain: Pointer to "struct tomoyo_domain_info".
2095 * @header: Lines containing ACL.
2096 *
2097 * Returns nothing.
2098 */
2099static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
2100{
2101	char *buffer;
2102	char *realpath = NULL;
2103	char *argv0 = NULL;
2104	char *symlink = NULL;
2105	char *cp = strchr(header, '\n');
2106	int len;
2107
2108	if (!cp)
2109		return;
2110	cp = strchr(cp + 1, '\n');
2111	if (!cp)
2112		return;
2113	*cp++ = '\0';
2114	/* Reserve some space for potentially using patterns. */
2115	len = strlen(cp) + 16;
2116	/* strstr() will return NULL if ordering is wrong. */
2117	if (*cp == 'f') {
2118		argv0 = strstr(header, " argv[]={ \"");
2119		if (argv0) {
2120			argv0 += 10;
2121			len += tomoyo_truncate(argv0) + 14;
2122		}
2123		realpath = strstr(header, " exec={ realpath=\"");
2124		if (realpath) {
2125			realpath += 8;
2126			len += tomoyo_truncate(realpath) + 6;
2127		}
2128		symlink = strstr(header, " symlink.target=\"");
2129		if (symlink)
2130			len += tomoyo_truncate(symlink + 1) + 1;
2131	}
2132	buffer = kmalloc(len, GFP_NOFS | __GFP_ZERO);
2133	if (!buffer)
2134		return;
2135	tomoyo_patternize_path(buffer, len, cp);
2136	if (realpath)
2137		tomoyo_addprintf(buffer, len, " exec.%s", realpath);
2138	if (argv0)
2139		tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
2140	if (symlink)
2141		tomoyo_addprintf(buffer, len, "%s", symlink);
2142	tomoyo_normalize_line(buffer);
2143	if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
2144				  false))
2145		tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2146	kfree(buffer);
2147}
2148
2149/**
2150 * tomoyo_supervisor - Ask for the supervisor's decision.
2151 *
2152 * @r:   Pointer to "struct tomoyo_request_info".
2153 * @fmt: The printf()'s format string, followed by parameters.
2154 *
2155 * Returns 0 if the supervisor decided to permit the access request which
2156 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
2157 * supervisor decided to retry the access request which violated the policy in
2158 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
2159 */
2160int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
2161{
2162	va_list args;
2163	int error;
2164	int len;
2165	static unsigned int tomoyo_serial;
2166	struct tomoyo_query entry = { };
2167	bool quota_exceeded = false;
2168
2169	va_start(args, fmt);
2170	len = vsnprintf(NULL, 0, fmt, args) + 1;
2171	va_end(args);
2172	/* Write /sys/kernel/security/tomoyo/audit. */
2173	va_start(args, fmt);
2174	tomoyo_write_log2(r, len, fmt, args);
2175	va_end(args);
2176	/* Nothing more to do if granted. */
2177	if (r->granted)
2178		return 0;
2179	if (r->mode)
2180		tomoyo_update_stat(r->mode);
2181	switch (r->mode) {
2182	case TOMOYO_CONFIG_ENFORCING:
2183		error = -EPERM;
2184		if (atomic_read(&tomoyo_query_observers))
2185			break;
2186		goto out;
2187	case TOMOYO_CONFIG_LEARNING:
2188		error = 0;
2189		/* Check max_learning_entry parameter. */
2190		if (tomoyo_domain_quota_is_ok(r))
2191			break;
2192		fallthrough;
2193	default:
2194		return 0;
2195	}
2196	/* Get message. */
2197	va_start(args, fmt);
2198	entry.query = tomoyo_init_log(r, len, fmt, args);
2199	va_end(args);
2200	if (!entry.query)
2201		goto out;
2202	entry.query_len = strlen(entry.query) + 1;
2203	if (!error) {
2204		tomoyo_add_entry(r->domain, entry.query);
2205		goto out;
2206	}
2207	len = kmalloc_size_roundup(entry.query_len);
2208	entry.domain = r->domain;
2209	spin_lock(&tomoyo_query_list_lock);
2210	if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
2211	    tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
2212	    >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
2213		quota_exceeded = true;
2214	} else {
2215		entry.serial = tomoyo_serial++;
2216		entry.retry = r->retry;
2217		tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
2218		list_add_tail(&entry.list, &tomoyo_query_list);
2219	}
2220	spin_unlock(&tomoyo_query_list_lock);
2221	if (quota_exceeded)
2222		goto out;
2223	/* Give 10 seconds for supervisor's opinion. */
2224	while (entry.timer < 10) {
2225		wake_up_all(&tomoyo_query_wait);
2226		if (wait_event_interruptible_timeout
2227		    (tomoyo_answer_wait, entry.answer ||
2228		     !atomic_read(&tomoyo_query_observers), HZ))
2229			break;
2230		entry.timer++;
2231	}
2232	spin_lock(&tomoyo_query_list_lock);
2233	list_del(&entry.list);
2234	tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
2235	spin_unlock(&tomoyo_query_list_lock);
2236	switch (entry.answer) {
2237	case 3: /* Asked to retry by administrator. */
2238		error = TOMOYO_RETRY_REQUEST;
2239		r->retry++;
2240		break;
2241	case 1:
2242		/* Granted by administrator. */
2243		error = 0;
2244		break;
2245	default:
2246		/* Timed out or rejected by administrator. */
2247		break;
2248	}
2249out:
2250	kfree(entry.query);
2251	return error;
2252}
2253
2254/**
2255 * tomoyo_find_domain_by_qid - Get domain by query id.
2256 *
2257 * @serial: Query ID assigned by tomoyo_supervisor().
2258 *
2259 * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
2260 */
2261static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
2262(unsigned int serial)
2263{
2264	struct tomoyo_query *ptr;
2265	struct tomoyo_domain_info *domain = NULL;
2266
2267	spin_lock(&tomoyo_query_list_lock);
2268	list_for_each_entry(ptr, &tomoyo_query_list, list) {
2269		if (ptr->serial != serial)
2270			continue;
2271		domain = ptr->domain;
2272		break;
2273	}
2274	spin_unlock(&tomoyo_query_list_lock);
2275	return domain;
2276}
2277
2278/**
2279 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
2280 *
2281 * @file: Pointer to "struct file".
2282 * @wait: Pointer to "poll_table".
2283 *
2284 * Returns EPOLLIN | EPOLLRDNORM when ready to read, 0 otherwise.
2285 *
2286 * Waits for access requests which violated policy in enforcing mode.
2287 */
2288static __poll_t tomoyo_poll_query(struct file *file, poll_table *wait)
2289{
2290	if (!list_empty(&tomoyo_query_list))
2291		return EPOLLIN | EPOLLRDNORM;
2292	poll_wait(file, &tomoyo_query_wait, wait);
2293	if (!list_empty(&tomoyo_query_list))
2294		return EPOLLIN | EPOLLRDNORM;
2295	return 0;
2296}
2297
2298/**
2299 * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
2300 *
2301 * @head: Pointer to "struct tomoyo_io_buffer".
2302 */
2303static void tomoyo_read_query(struct tomoyo_io_buffer *head)
2304{
2305	struct list_head *tmp;
2306	unsigned int pos = 0;
2307	size_t len = 0;
2308	char *buf;
2309
2310	if (head->r.w_pos)
2311		return;
2312	kfree(head->read_buf);
2313	head->read_buf = NULL;
2314	spin_lock(&tomoyo_query_list_lock);
2315	list_for_each(tmp, &tomoyo_query_list) {
2316		struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2317
2318		if (pos++ != head->r.query_index)
2319			continue;
2320		len = ptr->query_len;
2321		break;
2322	}
2323	spin_unlock(&tomoyo_query_list_lock);
2324	if (!len) {
2325		head->r.query_index = 0;
2326		return;
2327	}
2328	buf = kzalloc(len + 32, GFP_NOFS);
2329	if (!buf)
2330		return;
2331	pos = 0;
2332	spin_lock(&tomoyo_query_list_lock);
2333	list_for_each(tmp, &tomoyo_query_list) {
2334		struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2335
2336		if (pos++ != head->r.query_index)
2337			continue;
2338		/*
2339		 * Some query can be skipped because tomoyo_query_list
2340		 * can change, but I don't care.
2341		 */
2342		if (len == ptr->query_len)
2343			snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
2344				 ptr->retry, ptr->query);
2345		break;
2346	}
2347	spin_unlock(&tomoyo_query_list_lock);
2348	if (buf[0]) {
2349		head->read_buf = buf;
2350		head->r.w[head->r.w_pos++] = buf;
2351		head->r.query_index++;
2352	} else {
2353		kfree(buf);
2354	}
2355}
2356
2357/**
2358 * tomoyo_write_answer - Write the supervisor's decision.
2359 *
2360 * @head: Pointer to "struct tomoyo_io_buffer".
2361 *
2362 * Returns 0 on success, -EINVAL otherwise.
2363 */
2364static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
2365{
2366	char *data = head->write_buf;
2367	struct list_head *tmp;
2368	unsigned int serial;
2369	unsigned int answer;
2370
2371	spin_lock(&tomoyo_query_list_lock);
2372	list_for_each(tmp, &tomoyo_query_list) {
2373		struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2374
2375		ptr->timer = 0;
2376	}
2377	spin_unlock(&tomoyo_query_list_lock);
2378	if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
2379		return -EINVAL;
2380	spin_lock(&tomoyo_query_list_lock);
2381	list_for_each(tmp, &tomoyo_query_list) {
2382		struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2383
2384		if (ptr->serial != serial)
2385			continue;
2386		ptr->answer = answer;
2387		/* Remove from tomoyo_query_list. */
2388		if (ptr->answer)
2389			list_del_init(&ptr->list);
2390		break;
2391	}
2392	spin_unlock(&tomoyo_query_list_lock);
2393	return 0;
2394}
2395
2396/**
2397 * tomoyo_read_version: Get version.
2398 *
2399 * @head: Pointer to "struct tomoyo_io_buffer".
2400 *
2401 * Returns version information.
2402 */
2403static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2404{
2405	if (!head->r.eof) {
2406		tomoyo_io_printf(head, "2.6.0");
2407		head->r.eof = true;
2408	}
2409}
2410
2411/* String table for /sys/kernel/security/tomoyo/stat interface. */
2412static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2413	[TOMOYO_STAT_POLICY_UPDATES]    = "update:",
2414	[TOMOYO_STAT_POLICY_LEARNING]   = "violation in learning mode:",
2415	[TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2416	[TOMOYO_STAT_POLICY_ENFORCING]  = "violation in enforcing mode:",
2417};
2418
2419/* String table for /sys/kernel/security/tomoyo/stat interface. */
2420static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2421	[TOMOYO_MEMORY_POLICY] = "policy:",
2422	[TOMOYO_MEMORY_AUDIT]  = "audit log:",
2423	[TOMOYO_MEMORY_QUERY]  = "query message:",
2424};
2425
2426/* Counter for number of updates. */
2427static atomic_t tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2428/* Timestamp counter for last updated. */
2429static time64_t tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2430
2431/**
2432 * tomoyo_update_stat - Update statistic counters.
2433 *
2434 * @index: Index for policy type.
2435 *
2436 * Returns nothing.
2437 */
2438void tomoyo_update_stat(const u8 index)
2439{
2440	atomic_inc(&tomoyo_stat_updated[index]);
2441	tomoyo_stat_modified[index] = ktime_get_real_seconds();
2442}
2443
2444/**
2445 * tomoyo_read_stat - Read statistic data.
2446 *
2447 * @head: Pointer to "struct tomoyo_io_buffer".
2448 *
2449 * Returns nothing.
2450 */
2451static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2452{
2453	u8 i;
2454	unsigned int total = 0;
2455
2456	if (head->r.eof)
2457		return;
2458	for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2459		tomoyo_io_printf(head, "Policy %-30s %10u",
2460				 tomoyo_policy_headers[i],
2461				 atomic_read(&tomoyo_stat_updated[i]));
2462		if (tomoyo_stat_modified[i]) {
2463			struct tomoyo_time stamp;
2464
2465			tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2466			tomoyo_io_printf(head, " (Last: %04u/%02u/%02u %02u:%02u:%02u)",
2467					 stamp.year, stamp.month, stamp.day,
2468					 stamp.hour, stamp.min, stamp.sec);
2469		}
2470		tomoyo_set_lf(head);
2471	}
2472	for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2473		unsigned int used = tomoyo_memory_used[i];
2474
2475		total += used;
2476		tomoyo_io_printf(head, "Memory used by %-22s %10u",
2477				 tomoyo_memory_headers[i], used);
2478		used = tomoyo_memory_quota[i];
2479		if (used)
2480			tomoyo_io_printf(head, " (Quota: %10u)", used);
2481		tomoyo_set_lf(head);
2482	}
2483	tomoyo_io_printf(head, "Total memory used:                    %10u\n",
2484			 total);
2485	head->r.eof = true;
2486}
2487
2488/**
2489 * tomoyo_write_stat - Set memory quota.
2490 *
2491 * @head: Pointer to "struct tomoyo_io_buffer".
2492 *
2493 * Returns 0.
2494 */
2495static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2496{
2497	char *data = head->write_buf;
2498	u8 i;
2499
2500	if (tomoyo_str_starts(&data, "Memory used by "))
2501		for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2502			if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2503				sscanf(data, "%u", &tomoyo_memory_quota[i]);
2504	return 0;
2505}
2506
2507/**
2508 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2509 *
2510 * @type: Type of interface.
2511 * @file: Pointer to "struct file".
2512 *
2513 * Returns 0 on success, negative value otherwise.
2514 */
2515int tomoyo_open_control(const u8 type, struct file *file)
2516{
2517	struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2518
2519	if (!head)
2520		return -ENOMEM;
2521	mutex_init(&head->io_sem);
2522	head->type = type;
2523	switch (type) {
2524	case TOMOYO_DOMAINPOLICY:
2525		/* /sys/kernel/security/tomoyo/domain_policy */
2526		head->write = tomoyo_write_domain;
2527		head->read = tomoyo_read_domain;
2528		break;
2529	case TOMOYO_EXCEPTIONPOLICY:
2530		/* /sys/kernel/security/tomoyo/exception_policy */
2531		head->write = tomoyo_write_exception;
2532		head->read = tomoyo_read_exception;
2533		break;
2534	case TOMOYO_AUDIT:
2535		/* /sys/kernel/security/tomoyo/audit */
2536		head->poll = tomoyo_poll_log;
2537		head->read = tomoyo_read_log;
2538		break;
2539	case TOMOYO_PROCESS_STATUS:
2540		/* /sys/kernel/security/tomoyo/.process_status */
2541		head->write = tomoyo_write_pid;
2542		head->read = tomoyo_read_pid;
2543		break;
2544	case TOMOYO_VERSION:
2545		/* /sys/kernel/security/tomoyo/version */
2546		head->read = tomoyo_read_version;
2547		head->readbuf_size = 128;
2548		break;
2549	case TOMOYO_STAT:
2550		/* /sys/kernel/security/tomoyo/stat */
2551		head->write = tomoyo_write_stat;
2552		head->read = tomoyo_read_stat;
2553		head->readbuf_size = 1024;
2554		break;
2555	case TOMOYO_PROFILE:
2556		/* /sys/kernel/security/tomoyo/profile */
2557		head->write = tomoyo_write_profile;
2558		head->read = tomoyo_read_profile;
2559		break;
2560	case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2561		head->poll = tomoyo_poll_query;
2562		head->write = tomoyo_write_answer;
2563		head->read = tomoyo_read_query;
2564		break;
2565	case TOMOYO_MANAGER:
2566		/* /sys/kernel/security/tomoyo/manager */
2567		head->write = tomoyo_write_manager;
2568		head->read = tomoyo_read_manager;
2569		break;
2570	}
2571	if (!(file->f_mode & FMODE_READ)) {
2572		/*
2573		 * No need to allocate read_buf since it is not opened
2574		 * for reading.
2575		 */
2576		head->read = NULL;
2577		head->poll = NULL;
2578	} else if (!head->poll) {
2579		/* Don't allocate read_buf for poll() access. */
2580		if (!head->readbuf_size)
2581			head->readbuf_size = 4096 * 2;
2582		head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2583		if (!head->read_buf) {
2584			kfree(head);
2585			return -ENOMEM;
2586		}
2587	}
2588	if (!(file->f_mode & FMODE_WRITE)) {
2589		/*
2590		 * No need to allocate write_buf since it is not opened
2591		 * for writing.
2592		 */
2593		head->write = NULL;
2594	} else if (head->write) {
2595		head->writebuf_size = 4096 * 2;
2596		head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2597		if (!head->write_buf) {
2598			kfree(head->read_buf);
2599			kfree(head);
2600			return -ENOMEM;
2601		}
2602	}
2603	/*
2604	 * If the file is /sys/kernel/security/tomoyo/query , increment the
2605	 * observer counter.
2606	 * The obserber counter is used by tomoyo_supervisor() to see if
2607	 * there is some process monitoring /sys/kernel/security/tomoyo/query.
2608	 */
2609	if (type == TOMOYO_QUERY)
2610		atomic_inc(&tomoyo_query_observers);
2611	file->private_data = head;
2612	tomoyo_notify_gc(head, true);
2613	return 0;
2614}
2615
2616/**
2617 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2618 *
2619 * @file: Pointer to "struct file".
2620 * @wait: Pointer to "poll_table". Maybe NULL.
2621 *
2622 * Returns EPOLLIN | EPOLLRDNORM | EPOLLOUT | EPOLLWRNORM if ready to read/write,
2623 * EPOLLOUT | EPOLLWRNORM otherwise.
2624 */
2625__poll_t tomoyo_poll_control(struct file *file, poll_table *wait)
2626{
2627	struct tomoyo_io_buffer *head = file->private_data;
2628
2629	if (head->poll)
2630		return head->poll(file, wait) | EPOLLOUT | EPOLLWRNORM;
2631	return EPOLLIN | EPOLLRDNORM | EPOLLOUT | EPOLLWRNORM;
2632}
2633
2634/**
2635 * tomoyo_set_namespace_cursor - Set namespace to read.
2636 *
2637 * @head: Pointer to "struct tomoyo_io_buffer".
2638 *
2639 * Returns nothing.
2640 */
2641static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2642{
2643	struct list_head *ns;
2644
2645	if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2646	    head->type != TOMOYO_PROFILE)
2647		return;
2648	/*
2649	 * If this is the first read, or reading previous namespace finished
2650	 * and has more namespaces to read, update the namespace cursor.
2651	 */
2652	ns = head->r.ns;
2653	if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2654		/* Clearing is OK because tomoyo_flush() returned true. */
2655		memset(&head->r, 0, sizeof(head->r));
2656		head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2657	}
2658}
2659
2660/**
2661 * tomoyo_has_more_namespace - Check for unread namespaces.
2662 *
2663 * @head: Pointer to "struct tomoyo_io_buffer".
2664 *
2665 * Returns true if we have more entries to print, false otherwise.
2666 */
2667static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2668{
2669	return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2670		head->type == TOMOYO_PROFILE) && head->r.eof &&
2671		head->r.ns->next != &tomoyo_namespace_list;
2672}
2673
2674/**
2675 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2676 *
2677 * @head:       Pointer to "struct tomoyo_io_buffer".
2678 * @buffer:     Pointer to buffer to write to.
2679 * @buffer_len: Size of @buffer.
2680 *
2681 * Returns bytes read on success, negative value otherwise.
2682 */
2683ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2684			    const int buffer_len)
2685{
2686	int len;
2687	int idx;
2688
2689	if (!head->read)
2690		return -EINVAL;
2691	if (mutex_lock_interruptible(&head->io_sem))
2692		return -EINTR;
2693	head->read_user_buf = buffer;
2694	head->read_user_buf_avail = buffer_len;
2695	idx = tomoyo_read_lock();
2696	if (tomoyo_flush(head))
2697		/* Call the policy handler. */
2698		do {
2699			tomoyo_set_namespace_cursor(head);
2700			head->read(head);
2701		} while (tomoyo_flush(head) &&
2702			 tomoyo_has_more_namespace(head));
2703	tomoyo_read_unlock(idx);
2704	len = head->read_user_buf - buffer;
2705	mutex_unlock(&head->io_sem);
2706	return len;
2707}
2708
2709/**
2710 * tomoyo_parse_policy - Parse a policy line.
2711 *
2712 * @head: Pointer to "struct tomoyo_io_buffer".
2713 * @line: Line to parse.
2714 *
2715 * Returns 0 on success, negative value otherwise.
2716 *
2717 * Caller holds tomoyo_read_lock().
2718 */
2719static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2720{
2721	/* Delete request? */
2722	head->w.is_delete = !strncmp(line, "delete ", 7);
2723	if (head->w.is_delete)
2724		memmove(line, line + 7, strlen(line + 7) + 1);
2725	/* Selecting namespace to update. */
2726	if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2727	    head->type == TOMOYO_PROFILE) {
2728		if (*line == '<') {
2729			char *cp = strchr(line, ' ');
2730
2731			if (cp) {
2732				*cp++ = '\0';
2733				head->w.ns = tomoyo_assign_namespace(line);
2734				memmove(line, cp, strlen(cp) + 1);
2735			} else
2736				head->w.ns = NULL;
2737		} else
2738			head->w.ns = &tomoyo_kernel_namespace;
2739		/* Don't allow updating if namespace is invalid. */
2740		if (!head->w.ns)
2741			return -ENOENT;
2742	}
2743	/* Do the update. */
2744	return head->write(head);
2745}
2746
2747/**
2748 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2749 *
2750 * @head:       Pointer to "struct tomoyo_io_buffer".
2751 * @buffer:     Pointer to buffer to read from.
2752 * @buffer_len: Size of @buffer.
2753 *
2754 * Returns @buffer_len on success, negative value otherwise.
2755 */
2756ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2757			     const char __user *buffer, const int buffer_len)
2758{
2759	int error = buffer_len;
2760	size_t avail_len = buffer_len;
2761	char *cp0;
2762	int idx;
2763
2764	if (!head->write)
2765		return -EINVAL;
2766	if (mutex_lock_interruptible(&head->io_sem))
2767		return -EINTR;
2768	cp0 = head->write_buf;
2769	head->read_user_buf_avail = 0;
2770	idx = tomoyo_read_lock();
2771	/* Read a line and dispatch it to the policy handler. */
2772	while (avail_len > 0) {
2773		char c;
2774
2775		if (head->w.avail >= head->writebuf_size - 1) {
2776			const int len = head->writebuf_size * 2;
2777			char *cp = kzalloc(len, GFP_NOFS | __GFP_NOWARN);
2778
2779			if (!cp) {
2780				error = -ENOMEM;
2781				break;
2782			}
2783			memmove(cp, cp0, head->w.avail);
2784			kfree(cp0);
2785			head->write_buf = cp;
2786			cp0 = cp;
2787			head->writebuf_size = len;
2788		}
2789		if (get_user(c, buffer)) {
2790			error = -EFAULT;
2791			break;
2792		}
2793		buffer++;
2794		avail_len--;
2795		cp0[head->w.avail++] = c;
2796		if (c != '\n')
2797			continue;
2798		cp0[head->w.avail - 1] = '\0';
2799		head->w.avail = 0;
2800		tomoyo_normalize_line(cp0);
2801		if (!strcmp(cp0, "reset")) {
2802			head->w.ns = &tomoyo_kernel_namespace;
2803			head->w.domain = NULL;
2804			memset(&head->r, 0, sizeof(head->r));
2805			continue;
2806		}
2807		/* Don't allow updating policies by non manager programs. */
2808		switch (head->type) {
2809		case TOMOYO_PROCESS_STATUS:
2810			/* This does not write anything. */
2811			break;
2812		case TOMOYO_DOMAINPOLICY:
2813			if (tomoyo_select_domain(head, cp0))
2814				continue;
2815			fallthrough;
2816		case TOMOYO_EXCEPTIONPOLICY:
2817			if (!strcmp(cp0, "select transition_only")) {
2818				head->r.print_transition_related_only = true;
2819				continue;
2820			}
2821			fallthrough;
2822		default:
2823			if (!tomoyo_manager()) {
2824				error = -EPERM;
2825				goto out;
2826			}
2827		}
2828		switch (tomoyo_parse_policy(head, cp0)) {
2829		case -EPERM:
2830			error = -EPERM;
2831			goto out;
2832		case 0:
2833			switch (head->type) {
2834			case TOMOYO_DOMAINPOLICY:
2835			case TOMOYO_EXCEPTIONPOLICY:
2836			case TOMOYO_STAT:
2837			case TOMOYO_PROFILE:
2838			case TOMOYO_MANAGER:
2839				tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2840				break;
2841			default:
2842				break;
2843			}
2844			break;
2845		}
2846	}
2847out:
2848	tomoyo_read_unlock(idx);
2849	mutex_unlock(&head->io_sem);
2850	return error;
2851}
2852
2853/**
2854 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2855 *
2856 * @head: Pointer to "struct tomoyo_io_buffer".
2857 */
2858void tomoyo_close_control(struct tomoyo_io_buffer *head)
2859{
2860	/*
2861	 * If the file is /sys/kernel/security/tomoyo/query , decrement the
2862	 * observer counter.
2863	 */
2864	if (head->type == TOMOYO_QUERY &&
2865	    atomic_dec_and_test(&tomoyo_query_observers))
2866		wake_up_all(&tomoyo_answer_wait);
2867	tomoyo_notify_gc(head, false);
2868}
2869
2870/**
2871 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2872 */
2873void tomoyo_check_profile(void)
2874{
2875	struct tomoyo_domain_info *domain;
2876	const int idx = tomoyo_read_lock();
2877
2878	tomoyo_policy_loaded = true;
2879	pr_info("TOMOYO: 2.6.0\n");
2880	list_for_each_entry_rcu(domain, &tomoyo_domain_list, list,
2881				srcu_read_lock_held(&tomoyo_ss)) {
2882		const u8 profile = domain->profile;
2883		struct tomoyo_policy_namespace *ns = domain->ns;
2884
2885		if (ns->profile_version == 20110903) {
2886			pr_info_once("Converting profile version from %u to %u.\n",
2887				     20110903, 20150505);
2888			ns->profile_version = 20150505;
2889		}
2890		if (ns->profile_version != 20150505)
2891			pr_err("Profile version %u is not supported.\n",
2892			       ns->profile_version);
2893		else if (!ns->profile_ptr[profile])
2894			pr_err("Profile %u (used by '%s') is not defined.\n",
2895			       profile, domain->domainname->name);
2896		else
2897			continue;
2898		pr_err("Userland tools for TOMOYO 2.6 must be installed and policy must be initialized.\n");
2899		pr_err("Please see https://tomoyo.sourceforge.net/2.6/ for more information.\n");
2900		panic("STOP!");
2901	}
2902	tomoyo_read_unlock(idx);
2903	pr_info("Mandatory Access Control activated.\n");
2904}
2905
2906/**
2907 * tomoyo_load_builtin_policy - Load built-in policy.
2908 *
2909 * Returns nothing.
2910 */
2911void __init tomoyo_load_builtin_policy(void)
2912{
2913#ifdef CONFIG_SECURITY_TOMOYO_INSECURE_BUILTIN_SETTING
2914	static char tomoyo_builtin_profile[] __initdata =
2915		"PROFILE_VERSION=20150505\n"
2916		"0-CONFIG={ mode=learning grant_log=no reject_log=yes }\n";
2917	static char tomoyo_builtin_exception_policy[] __initdata =
2918		"aggregator proc:/self/exe /proc/self/exe\n";
2919	static char tomoyo_builtin_domain_policy[] __initdata = "";
2920	static char tomoyo_builtin_manager[] __initdata = "";
2921	static char tomoyo_builtin_stat[] __initdata = "";
2922#else
2923	/*
2924	 * This include file is manually created and contains built-in policy
2925	 * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2926	 * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2927	 * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2928	 */
2929#include "builtin-policy.h"
2930#endif
2931	u8 i;
2932	const int idx = tomoyo_read_lock();
2933
2934	for (i = 0; i < 5; i++) {
2935		struct tomoyo_io_buffer head = { };
2936		char *start = "";
2937
2938		switch (i) {
2939		case 0:
2940			start = tomoyo_builtin_profile;
2941			head.type = TOMOYO_PROFILE;
2942			head.write = tomoyo_write_profile;
2943			break;
2944		case 1:
2945			start = tomoyo_builtin_exception_policy;
2946			head.type = TOMOYO_EXCEPTIONPOLICY;
2947			head.write = tomoyo_write_exception;
2948			break;
2949		case 2:
2950			start = tomoyo_builtin_domain_policy;
2951			head.type = TOMOYO_DOMAINPOLICY;
2952			head.write = tomoyo_write_domain;
2953			break;
2954		case 3:
2955			start = tomoyo_builtin_manager;
2956			head.type = TOMOYO_MANAGER;
2957			head.write = tomoyo_write_manager;
2958			break;
2959		case 4:
2960			start = tomoyo_builtin_stat;
2961			head.type = TOMOYO_STAT;
2962			head.write = tomoyo_write_stat;
2963			break;
2964		}
2965		while (1) {
2966			char *end = strchr(start, '\n');
2967
2968			if (!end)
2969				break;
2970			*end = '\0';
2971			tomoyo_normalize_line(start);
2972			head.write_buf = start;
2973			tomoyo_parse_policy(&head, start);
2974			start = end + 1;
2975		}
2976	}
2977	tomoyo_read_unlock(idx);
2978#ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2979	tomoyo_check_profile();
2980#endif
2981}