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. */
15	const 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 */
23	const 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. */
74	const 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. */
137	static 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. */
143	const 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. */
158	const 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. */
166	static 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? */
174	static 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)
188	static 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(buf: buffer + pos, size: 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	*/
205	static 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(to: head->read_user_buf, from: w, n: 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(to: head->read_user_buf, from: "", n: 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	*/
251	static 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
260	static 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	*/
269	static 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(buf: 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, string: head->read_buf + pos);
288	}
289
290	/**
291	* tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure.
292	*
293	* @head: Pointer to "struct tomoyo_io_buffer".
294	*
295	* Returns nothing.
296	*/
297	static void tomoyo_set_space(struct tomoyo_io_buffer *head)
298	{
299	tomoyo_set_string(head, string: " ");
300	}
301
302	/**
303	* tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure.
304	*
305	* @head: Pointer to "struct tomoyo_io_buffer".
306	*
307	* Returns nothing.
308	*/
309	static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
310	{
311	tomoyo_set_string(head, string: "\n");
312	return !head->r.w_pos;
313	}
314
315	/**
316	* tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure.
317	*
318	* @head: Pointer to "struct tomoyo_io_buffer".
319	*
320	* Returns nothing.
321	*/
322	static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
323	{
324	tomoyo_set_string(head, string: "/");
325	}
326
327	/* List of namespaces. */
328	LIST_HEAD(tomoyo_namespace_list);
329	/* True if namespace other than tomoyo_kernel_namespace is defined. */
330	static bool tomoyo_namespace_enabled;
331
332	/**
333	* tomoyo_init_policy_namespace - Initialize namespace.
334	*
335	* @ns: Pointer to "struct tomoyo_policy_namespace".
336	*
337	* Returns nothing.
338	*/
339	void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns)
340	{
341	unsigned int idx;
342
343	for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++)
344	INIT_LIST_HEAD(list: &ns->acl_group[idx]);
345	for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++)
346	INIT_LIST_HEAD(list: &ns->group_list[idx]);
347	for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++)
348	INIT_LIST_HEAD(list: &ns->policy_list[idx]);
349	ns->profile_version = 20150505;
350	tomoyo_namespace_enabled = !list_empty(head: &tomoyo_namespace_list);
351	list_add_tail_rcu(new: &ns->namespace_list, head: &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	*/
361	static 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	*/
378	static 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, string: "@");
384	tomoyo_set_string(head, string: ptr->group->group_name->name);
385	} else {
386	tomoyo_set_string(head, string: 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	*/
398	static 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, string: "@");
403	tomoyo_set_string(head, string: ptr->group->group_name->name);
404	} else {
405	tomoyo_set_string(head, string: "\"");
406	tomoyo_set_string(head, string: ptr->filename->name);
407	tomoyo_set_string(head, string: "\"");
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	*/
419	static 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, string: "@");
424	tomoyo_set_string(head, string: 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, len: sizeof(buffer),
438	fmt: "0x%lX", min);
439	break;
440	case TOMOYO_VALUE_TYPE_OCTAL:
441	tomoyo_addprintf(buffer, len: sizeof(buffer),
442	fmt: "0%lo", min);
443	break;
444	default:
445	tomoyo_addprintf(buffer, len: sizeof(buffer), fmt: "%lu",
446	min);
447	break;
448	}
449	if (min == max && min_type == max_type)
450	break;
451	tomoyo_addprintf(buffer, len: sizeof(buffer), fmt: "-");
452	min_type = max_type;
453	min = max;
454	}
455	tomoyo_io_printf(head, fmt: "%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	*/
467	static 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	*/
482	static 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(ptr: 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(lock: &tomoyo_policy_lock);
513	out:
514	kfree(objp: 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	*/
526	struct 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	*/
545	static 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	*/
568	static void tomoyo_set_uint(unsigned int *i, const char *string,
569	const char *find)
570	{
571	const char *cp = strstr(string, find);
572
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	*/
586	static 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(src: &name, find: "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(string: value, find: "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(string: value, find: "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	*/
666	static 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(ns: head->w.ns, profile: 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(name: cp);
691	const struct tomoyo_path_info *old_comment;
692
693	if (!new_comment)
694	return -ENOMEM;
695	spin_lock(lock: &lock);
696	old_comment = profile->comment;
697	profile->comment = new_comment;
698	spin_unlock(lock: &lock);
699	tomoyo_put_name(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(i: &profile->pref[i], string: cp,
705	find: tomoyo_pref_keywords[i]);
706	return 0;
707	}
708	return tomoyo_set_mode(name: data, value: 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	*/
721	static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
722	{
723	tomoyo_io_printf(head, fmt: "={ mode=%s grant_log=%s reject_log=%s }\n",
724	tomoyo_mode[config & 3],
725	str_yes_no(v: config & TOMOYO_CONFIG_WANT_GRANT_LOG),
726	str_yes_no(v: 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	*/
736	static 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, fmt: "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, fmt: "%u-COMMENT=", index);
774	tomoyo_set_string(head, string: comment ? comment->name : "");
775	tomoyo_set_lf(head);
776	tomoyo_print_namespace(head);
777	tomoyo_io_printf(head, fmt: "%u-PREFERENCE={ ", index);
778	for (i = 0; i < TOMOYO_MAX_PREF; i++)
779	tomoyo_io_printf(head, fmt: "%s=%u ",
780	tomoyo_pref_keywords[i],
781	profile->pref[i]);
782	tomoyo_set_string(head, string: "}\n");
783	head->r.step++;
784	}
785	break;
786	case 3:
787	{
788	tomoyo_print_namespace(head);
789	tomoyo_io_printf(head, fmt: "%u-%s", index, "CONFIG");
790	tomoyo_print_config(head, config: 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, fmt: "%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, fmt: "%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	*/
836	static 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	*/
853	static 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(domainname: manager) &&
865	!tomoyo_correct_word(string: manager))
866	return -EINVAL;
867	e.manager = tomoyo_get_name(name: manager);
868	if (e.manager) {
869	error = tomoyo_update_policy(new_entry: &e.head, size: sizeof(e), param: &param,
870	check_duplicate: tomoyo_same_manager);
871	tomoyo_put_name(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	*/
885	static 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(manager: data, is_delete: 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	*/
903	static 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, string: 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	*/
929	static 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(left: 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
969	static 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	*/
982	static 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(nr: pid, ns: &init_pid_ns);
999	else
1000	p = find_task_by_vpid(nr: pid);
1001	if (p)
1002	domain = tomoyo_task(task: p)->domain_info;
1003	rcu_read_unlock();
1004	} else if (!strncmp(data, "domain=", 7)) {
1005	if (tomoyo_domain_def(buffer: data + 7))
1006	domain = tomoyo_find_domain(domainname: data + 7);
1007	} else if (sscanf(data, "Q=%u", &pid) == 1) {
1008	domain = tomoyo_find_domain_by_qid(serial: 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, fmt: "# select %s\n", data);
1022	if (domain && domain->is_deleted)
1023	tomoyo_io_printf(head, fmt: "# 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	*/
1035	static 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	*/
1053	static int tomoyo_write_task(struct tomoyo_acl_param *param)
1054	{
1055	int error = -EINVAL;
1056
1057	if (tomoyo_str_starts(src: &param->data, find: "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(new_entry: &e.head, size: sizeof(e), param,
1065	check_duplicate: tomoyo_same_task_acl,
1066	NULL);
1067	tomoyo_put_name(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	*/
1081	static 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(ptr: &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(a: domain->domainname, b: &name))
1098	continue;
1099	domain->is_deleted = true;
1100	break;
1101	}
1102	mutex_unlock(lock: &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	*/
1118	static 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(src: &param.data,
1142	find: 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. */
1150	const 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	*/
1164	static 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(src: &data, find: "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(domainname: data);
1179	else if (is_select)
1180	domain = tomoyo_find_domain(domainname: data);
1181	else
1182	domain = tomoyo_assign_domain(domainname: data, transit: 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(nr: idx, addr: domain->group);
1200	else
1201	clear_bit(nr: idx, addr: 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, list: &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	*/
1224	static 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, string: 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	fmt: "exec.argv[%lu]%s=\"",
1291	argv->index, argv->is_not ? "!" : "");
1292	tomoyo_set_string(head,
1293	string: argv->value->name);
1294	tomoyo_set_string(head, string: "\"");
1295	argv++;
1296	continue;
1297	case TOMOYO_ENVP_ENTRY:
1298	tomoyo_set_string(head,
1299	string: "exec.envp[\"");
1300	tomoyo_set_string(head,
1301	string: envp->name->name);
1302	tomoyo_io_printf(head, fmt: "\"]%s=", envp->is_not ? "!" : "");
1303	if (envp->value) {
1304	tomoyo_set_string(head, string: "\"");
1305	tomoyo_set_string(head, string: envp->value->name);
1306	tomoyo_set_string(head, string: "\"");
1307	} else {
1308	tomoyo_set_string(head,
1309	string: "NULL");
1310	}
1311	envp++;
1312	continue;
1313	case TOMOYO_NUMBER_UNION:
1314	tomoyo_print_number_union_nospace
1315	(head, ptr: numbers_p++);
1316	break;
1317	default:
1318	tomoyo_set_string(head,
1319	string: tomoyo_condition_keyword[left]);
1320	break;
1321	}
1322	tomoyo_set_string(head, string: match ? "=" : "!=");
1323	switch (right) {
1324	case TOMOYO_NAME_UNION:
1325	tomoyo_print_name_union_quoted
1326	(head, ptr: names_p++);
1327	break;
1328	case TOMOYO_NUMBER_UNION:
1329	tomoyo_print_number_union_nospace
1330	(head, ptr: numbers_p++);
1331	break;
1332	default:
1333	tomoyo_set_string(head,
1334	string: 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, fmt: " grant_log=%s",
1349	str_yes_no(v: 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	*/
1365	static 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, fmt: "acl_group %u ",
1371	head->r.acl_group_index);
1372	}
1373	tomoyo_set_string(head, string: 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	*/
1384	static 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, category: "file ");
1410	first = false;
1411	} else {
1412	tomoyo_set_slash(head);
1413	}
1414	tomoyo_set_string(head, string: tomoyo_path_keyword[bit]);
1415	}
1416	if (first)
1417	return true;
1418	tomoyo_print_name_union(head, ptr: &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, category: "task ");
1424	tomoyo_set_string(head, string: "manual_domain_transition ");
1425	tomoyo_set_string(head, string: 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, category: "file ");
1438	first = false;
1439	} else {
1440	tomoyo_set_slash(head);
1441	}
1442	tomoyo_set_string(head, string: tomoyo_mac_keywords
1443	[tomoyo_pp2mac[bit]]);
1444	}
1445	if (first)
1446	return true;
1447	tomoyo_print_name_union(head, ptr: &ptr->name1);
1448	tomoyo_print_name_union(head, ptr: &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, category: "file ");
1459	first = false;
1460	} else {
1461	tomoyo_set_slash(head);
1462	}
1463	tomoyo_set_string(head, string: tomoyo_mac_keywords
1464	[tomoyo_pn2mac[bit]]);
1465	}
1466	if (first)
1467	return true;
1468	tomoyo_print_name_union(head, ptr: &ptr->name);
1469	tomoyo_print_number_union(head, ptr: &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, category: "file ");
1480	first = false;
1481	} else {
1482	tomoyo_set_slash(head);
1483	}
1484	tomoyo_set_string(head, string: tomoyo_mac_keywords
1485	[tomoyo_pnnn2mac[bit]]);
1486	}
1487	if (first)
1488	return true;
1489	tomoyo_print_name_union(head, ptr: &ptr->name);
1490	tomoyo_print_number_union(head, ptr: &ptr->mode);
1491	tomoyo_print_number_union(head, ptr: &ptr->major);
1492	tomoyo_print_number_union(head, ptr: &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, category: "network inet ");
1503	tomoyo_set_string(head, string: 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, string: 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, string: "@");
1517	tomoyo_set_string(head, string: ptr->address.group->group_name
1518	->name);
1519	} else {
1520	char buf[128];
1521
1522	tomoyo_print_ip(buf, size: sizeof(buf), ptr: &ptr->address);
1523	tomoyo_io_printf(head, fmt: "%s", buf);
1524	}
1525	tomoyo_print_number_union(head, ptr: &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, category: "network unix ");
1536	tomoyo_set_string(head, string: 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, string: tomoyo_socket_keyword[bit]);
1544	}
1545	if (first)
1546	return true;
1547	tomoyo_print_name_union(head, ptr: &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, category: "file mount");
1553	tomoyo_print_name_union(head, ptr: &ptr->dev_name);
1554	tomoyo_print_name_union(head, ptr: &ptr->dir_name);
1555	tomoyo_print_name_union(head, ptr: &ptr->fs_type);
1556	tomoyo_print_number_union(head, ptr: &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, category: "misc env ");
1562	tomoyo_set_string(head, string: 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;
1569	print_cond_part:
1570	if (!tomoyo_print_condition(head, cond: 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	*/
1589	static 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, acl: 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	*/
1610	static 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, string: domain->domainname->name);
1626	tomoyo_set_lf(head);
1627	tomoyo_io_printf(head, fmt: "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, string: 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, fmt: "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, list: &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	*/
1672	static 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	*/
1688	static 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(src: &buf, find: "global-pid "))
1705	global_pid = true;
1706	if (kstrtouint(s: buf, base: 10, res: &pid))
1707	return;
1708	rcu_read_lock();
1709	if (global_pid)
1710	p = find_task_by_pid_ns(nr: pid, ns: &init_pid_ns);
1711	else
1712	p = find_task_by_vpid(nr: pid);
1713	if (p)
1714	domain = tomoyo_task(task: p)->domain_info;
1715	rcu_read_unlock();
1716	if (!domain)
1717	return;
1718	tomoyo_io_printf(head, fmt: "%u %u ", pid, domain->profile);
1719	tomoyo_set_string(head, string: domain->domainname->name);
1720	}
1721
1722	/* String table for domain transition control keywords. */
1723	static 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. */
1733	static 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	*/
1748	static 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(src: &param.data, find: "aggregator "))
1759	return tomoyo_write_aggregator(param: &param);
1760	for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1761	if (tomoyo_str_starts(src: &param.data, find: tomoyo_transition_type[i]))
1762	return tomoyo_write_transition_control(param: &param, type: i);
1763	for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1764	if (tomoyo_str_starts(src: &param.data, find: tomoyo_group_name[i]))
1765	return tomoyo_write_group(param: &param, type: i);
1766	if (tomoyo_str_starts(src: &param.data, find: "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	(ns: head->w.ns, list: &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	*/
1789	static 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, string: tomoyo_group_name[idx]);
1809	tomoyo_set_string(head, string: 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, ptr: &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(buf: buffer, size: sizeof(buffer),
1827	ptr: &member->address);
1828	tomoyo_io_printf(head, fmt: " %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	*/
1848	static 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, string: tomoyo_transition_type
1869	[ptr->type]);
1870	tomoyo_set_string(head, string: ptr->program ?
1871	ptr->program->name : "any");
1872	tomoyo_set_string(head, string: " from ");
1873	tomoyo_set_string(head, string: 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, string: "aggregator ");
1885	tomoyo_set_string(head,
1886	string: ptr->original_name->name);
1887	tomoyo_set_space(head);
1888	tomoyo_set_string(head,
1889	string: 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	*/
1908	static 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, idx: 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, idx: 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, list: &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. */
1938	static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1939	/* Wait queue for userspace -> kernel notification. */
1940	static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1941
1942	/* Structure for query. */
1943	struct 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". */
1955	static LIST_HEAD(tomoyo_query_list);
1956
1957	/* Lock for manipulating tomoyo_query_list. */
1958	static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1959
1960	/*
1961	* Number of "struct file" referring /sys/kernel/security/tomoyo/query
1962	* interface.
1963	*/
1964	static 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	*/
1973	static 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	*/
1993	static 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	*/
2020	static 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, fmt: "%s ", entry);
2042	/* e.g. file ioctl pipe:[$INO] $CMD */
2043	if (tomoyo_numscan(str: cp, head: "pipe:[", width: &width, tail: ']')) {
2044	cp += width + 7;
2045	tomoyo_addprintf(buffer, len, fmt: "pipe:[\\$]");
2046	goto flush;
2047	}
2048	/* e.g. file ioctl socket:[$INO] $CMD */
2049	if (tomoyo_numscan(str: cp, head: "socket:[", width: &width, tail: ']')) {
2050	cp += width + 9;
2051	tomoyo_addprintf(buffer, len, fmt: "socket:[\\$]");
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, fmt: "proc:/self");
2058	} else if (tomoyo_numscan(str: cp, head: "proc:/", width: &width, tail: 0)) {
2059	/* e.g. file read proc:/$PID/task/$TID/fdinfo/$FD */
2060	/*
2061	* Don't patternize $PID part if $PID == 1, for several
2062	* programs access only files in /proc/1/ directory.
2063	*/
2064	cp += width + 6;
2065	if (width == 1 && *(cp - 1) == '1')
2066	tomoyo_addprintf(buffer, len, fmt: "proc:/1");
2067	else
2068	tomoyo_addprintf(buffer, len, fmt: "proc:/\\$");
2069	} else {
2070	goto flush;
2071	}
2072	/* Patternize $TID part if "/task/" follows. */
2073	if (tomoyo_numscan(str: cp, head: "/task/", width: &width, tail: 0)) {
2074	cp += width + 6;
2075	tomoyo_addprintf(buffer, len, fmt: "/task/\\$");
2076	}
2077	/* Patternize $FD part if "/fd/" or "/fdinfo/" follows. */
2078	if (tomoyo_numscan(str: cp, head: "/fd/", width: &width, tail: 0)) {
2079	cp += width + 4;
2080	tomoyo_addprintf(buffer, len, fmt: "/fd/\\$");
2081	} else if (tomoyo_numscan(str: cp, head: "/fdinfo/", width: &width, tail: 0)) {
2082	cp += width + 8;
2083	tomoyo_addprintf(buffer, len, fmt: "/fdinfo/\\$");
2084	}
2085	flush:
2086	/* Flush remaining part if any. */
2087	if (*cp)
2088	tomoyo_addprintf(buffer, len, fmt: "%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	*/
2099	static 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(str: argv0) + 14;
2122	}
2123	realpath = strstr(header, " exec={ realpath=\"");
2124	if (realpath) {
2125	realpath += 8;
2126	len += tomoyo_truncate(str: realpath) + 6;
2127	}
2128	symlink = strstr(header, " symlink.target=\"");
2129	if (symlink)
2130	len += tomoyo_truncate(str: symlink + 1) + 1;
2131	}
2132	buffer = kmalloc(len, GFP_NOFS | __GFP_ZERO);
2133	if (!buffer)
2134	return;
2135	tomoyo_patternize_path(buffer, len, entry: cp);
2136	if (realpath)
2137	tomoyo_addprintf(buffer, len, fmt: " exec.%s", realpath);
2138	if (argv0)
2139	tomoyo_addprintf(buffer, len, fmt: " exec.argv[0]=%s", argv0);
2140	if (symlink)
2141	tomoyo_addprintf(buffer, len, fmt: "%s", symlink);
2142	tomoyo_normalize_line(buffer);
2143	if (!tomoyo_write_domain2(ns: domain->ns, list: &domain->acl_info_list, data: buffer,
2144	is_delete: false))
2145	tomoyo_update_stat(index: TOMOYO_STAT_POLICY_UPDATES);
2146	kfree(objp: 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	*/
2160	int 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, size: 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(index: r->mode);
2181	switch (r->mode) {
2182	case TOMOYO_CONFIG_ENFORCING:
2183	error = -EPERM;
2184	if (atomic_read(v: &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(domain: r->domain, header: entry.query);
2205	goto out;
2206	}
2207	len = kmalloc_size_roundup(size: entry.query_len);
2208	entry.domain = r->domain;
2209	spin_lock(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(new: &entry.list, head: &tomoyo_query_list);
2219	}
2220	spin_unlock(lock: &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(lock: &tomoyo_query_list_lock);
2233	list_del(entry: &entry.list);
2234	tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
2235	spin_unlock(lock: &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	}
2249	out:
2250	kfree(objp: 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	*/
2261	static 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(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(lock: &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	*/
2288	static __poll_t tomoyo_poll_query(struct file *file, poll_table *wait)
2289	{
2290	if (!list_empty(head: &tomoyo_query_list))
2291	return EPOLLIN | EPOLLRDNORM;
2292	poll_wait(filp: file, wait_address: &tomoyo_query_wait, p: wait);
2293	if (!list_empty(head: &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	*/
2303	static 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(objp: head->read_buf);
2313	head->read_buf = NULL;
2314	spin_lock(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(lock: &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(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, size: len + 31, fmt: "Q%u-%hu\n%s", ptr->serial,
2344	ptr->retry, ptr->query);
2345	break;
2346	}
2347	spin_unlock(lock: &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(objp: 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	*/
2364	static 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(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(lock: &tomoyo_query_list_lock);
2378	if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
2379	return -EINVAL;
2380	spin_lock(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(entry: &ptr->list);
2390	break;
2391	}
2392	spin_unlock(lock: &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	*/
2403	static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2404	{
2405	if (!head->r.eof) {
2406	tomoyo_io_printf(head, fmt: "2.6.0");
2407	head->r.eof = true;
2408	}
2409	}
2410
2411	/* String table for /sys/kernel/security/tomoyo/stat interface. */
2412	static 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. */
2420	static 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. */
2427	static atomic_t tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2428	/* Timestamp counter for last updated. */
2429	static 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	*/
2438	void tomoyo_update_stat(const u8 index)
2439	{
2440	atomic_inc(v: &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	*/
2451	static 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, fmt: "Policy %-30s %10u",
2460	tomoyo_policy_headers[i],
2461	atomic_read(v: &tomoyo_stat_updated[i]));
2462	if (tomoyo_stat_modified[i]) {
2463	struct tomoyo_time stamp;
2464
2465	tomoyo_convert_time(time: tomoyo_stat_modified[i], stamp: &stamp);
2466	tomoyo_io_printf(head, fmt: " (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, fmt: "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, fmt: " (Quota: %10u)", used);
2481	tomoyo_set_lf(head);
2482	}
2483	tomoyo_io_printf(head, fmt: "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	*/
2495	static 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(src: &data, find: "Memory used by "))
2501	for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2502	if (tomoyo_str_starts(src: &data, find: 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	*/
2515	int 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(objp: 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(objp: head->read_buf);
2599	kfree(objp: 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(v: &tomoyo_query_observers);
2611	file->private_data = head;
2612	tomoyo_notify_gc(head, is_register: 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	*/
2641	static 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	*/
2667	static 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	*/
2683	ssize_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(lock: &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	*/
2719	static 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(domainname: 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	*/
2756	ssize_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(objp: 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(buffer: 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, data: 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, line: 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(index: TOMOYO_STAT_POLICY_UPDATES);
2840	break;
2841	default:
2842	break;
2843	}
2844	break;
2845	}
2846	}
2847	out:
2848	tomoyo_read_unlock(idx);
2849	mutex_unlock(lock: &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	*/
2858	void 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(v: &tomoyo_query_observers))
2866	wake_up_all(&tomoyo_answer_wait);
2867	tomoyo_notify_gc(head, is_register: false);
2868	}
2869
2870	/**
2871	* tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2872	*/
2873	void 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(fmt: "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	*/
2911	void __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(buffer: start);
2972	head.write_buf = start;
2973	tomoyo_parse_policy(head: &head, line: 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	}
2982