linux - security/tomoyo/common.c

3025 lines · 80.2 KiB

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(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	*/
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(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	*/
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	__must_hold(&head->io_sem)
272	{
273	va_list args;
274	size_t len;
275	size_t pos = head->r.avail;
276	int size = head->readbuf_size - pos;
277
278	if (size <= 0)
279	return;
280	va_start(args, fmt);
281	len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
282	va_end(args);
283	if (pos + len >= head->readbuf_size) {
284	WARN_ON(1);
285	return;
286	}
287	head->r.avail += len;
288	tomoyo_set_string(head, head->read_buf + pos);
289	}
290
291	/**
292	* tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure.
293	*
294	* @head: Pointer to "struct tomoyo_io_buffer".
295	*
296	* Returns nothing.
297	*/
298	static void tomoyo_set_space(struct tomoyo_io_buffer *head)
299	{
300	tomoyo_set_string(head, " ");
301	}
302
303	/**
304	* tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure.
305	*
306	* @head: Pointer to "struct tomoyo_io_buffer".
307	*
308	* Returns nothing.
309	*/
310	static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
311	{
312	tomoyo_set_string(head, "\n");
313	return !head->r.w_pos;
314	}
315
316	/**
317	* tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure.
318	*
319	* @head: Pointer to "struct tomoyo_io_buffer".
320	*
321	* Returns nothing.
322	*/
323	static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
324	{
325	tomoyo_set_string(head, "/");
326	}
327
328	/* List of namespaces. */
329	LIST_HEAD(tomoyo_namespace_list);
330	/* True if namespace other than tomoyo_kernel_namespace is defined. */
331	static bool tomoyo_namespace_enabled;
332
333	/**
334	* tomoyo_init_policy_namespace - Initialize namespace.
335	*
336	* @ns: Pointer to "struct tomoyo_policy_namespace".
337	*
338	* Returns nothing.
339	*/
340	void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns)
341	{
342	unsigned int idx;
343
344	for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++)
345	INIT_LIST_HEAD(&ns->acl_group[idx]);
346	for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++)
347	INIT_LIST_HEAD(&ns->group_list[idx]);
348	for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++)
349	INIT_LIST_HEAD(&ns->policy_list[idx]);
350	ns->profile_version = 20150505;
351	tomoyo_namespace_enabled = !list_empty(&tomoyo_namespace_list);
352	list_add_tail_rcu(&ns->namespace_list, &tomoyo_namespace_list);
353	}
354
355	/**
356	* tomoyo_print_namespace - Print namespace header.
357	*
358	* @head: Pointer to "struct tomoyo_io_buffer".
359	*
360	* Returns nothing.
361	*/
362	static void tomoyo_print_namespace(struct tomoyo_io_buffer *head)
363	{
364	if (!tomoyo_namespace_enabled)
365	return;
366	tomoyo_set_string(head,
367	container_of(head->r.ns,
368	struct tomoyo_policy_namespace,
369	namespace_list)->name);
370	tomoyo_set_space(head);
371	}
372
373	/**
374	* tomoyo_print_name_union - Print a tomoyo_name_union.
375	*
376	* @head: Pointer to "struct tomoyo_io_buffer".
377	* @ptr: Pointer to "struct tomoyo_name_union".
378	*/
379	static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
380	const struct tomoyo_name_union *ptr)
381	{
382	tomoyo_set_space(head);
383	if (ptr->group) {
384	tomoyo_set_string(head, "@");
385	tomoyo_set_string(head, ptr->group->group_name->name);
386	} else {
387	tomoyo_set_string(head, ptr->filename->name);
388	}
389	}
390
391	/**
392	* tomoyo_print_name_union_quoted - Print a tomoyo_name_union with a quote.
393	*
394	* @head: Pointer to "struct tomoyo_io_buffer".
395	* @ptr: Pointer to "struct tomoyo_name_union".
396	*
397	* Returns nothing.
398	*/
399	static void tomoyo_print_name_union_quoted(struct tomoyo_io_buffer *head,
400	const struct tomoyo_name_union *ptr)
401	{
402	if (ptr->group) {
403	tomoyo_set_string(head, "@");
404	tomoyo_set_string(head, ptr->group->group_name->name);
405	} else {
406	tomoyo_set_string(head, "\"");
407	tomoyo_set_string(head, ptr->filename->name);
408	tomoyo_set_string(head, "\"");
409	}
410	}
411
412	/**
413	* tomoyo_print_number_union_nospace - Print a tomoyo_number_union without a space.
414	*
415	* @head: Pointer to "struct tomoyo_io_buffer".
416	* @ptr: Pointer to "struct tomoyo_number_union".
417	*
418	* Returns nothing.
419	*/
420	static void
421	tomoyo_print_number_union_nospace(struct tomoyo_io_buffer head, const struct tomoyo_number_union ptr)
422	__must_hold(&head->io_sem)
423	{
424	if (ptr->group) {
425	tomoyo_set_string(head, "@");
426	tomoyo_set_string(head, ptr->group->group_name->name);
427	} else {
428	int i;
429	unsigned long min = ptr->values[0];
430	const unsigned long max = ptr->values[1];
431	u8 min_type = ptr->value_type[0];
432	const u8 max_type = ptr->value_type[1];
433	char buffer[128];
434
435	buffer[0] = '\0';
436	for (i = 0; i < 2; i++) {
437	switch (min_type) {
438	case TOMOYO_VALUE_TYPE_HEXADECIMAL:
439	tomoyo_addprintf(buffer, sizeof(buffer),
440	"0x%lX", min);
441	break;
442	case TOMOYO_VALUE_TYPE_OCTAL:
443	tomoyo_addprintf(buffer, sizeof(buffer),
444	"0%lo", min);
445	break;
446	default:
447	tomoyo_addprintf(buffer, sizeof(buffer), "%lu",
448	min);
449	break;
450	}
451	if (min == max && min_type == max_type)
452	break;
453	tomoyo_addprintf(buffer, sizeof(buffer), "-");
454	min_type = max_type;
455	min = max;
456	}
457	tomoyo_io_printf(head, "%s", buffer);
458	}
459	}
460
461	/**
462	* tomoyo_print_number_union - Print a tomoyo_number_union.
463	*
464	* @head: Pointer to "struct tomoyo_io_buffer".
465	* @ptr: Pointer to "struct tomoyo_number_union".
466	*
467	* Returns nothing.
468	*/
469	static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
470	const struct tomoyo_number_union *ptr)
471	__must_hold(&head->io_sem)
472	{
473	tomoyo_set_space(head);
474	tomoyo_print_number_union_nospace(head, ptr);
475	}
476
477	/**
478	* tomoyo_assign_profile - Create a new profile.
479	*
480	* @ns: Pointer to "struct tomoyo_policy_namespace".
481	* @profile: Profile number to create.
482	*
483	* Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
484	*/
485	static struct tomoyo_profile *tomoyo_assign_profile
486	(struct tomoyo_policy_namespace *ns, const unsigned int profile)
487	{
488	struct tomoyo_profile *ptr;
489	struct tomoyo_profile *entry;
490
491	if (profile >= TOMOYO_MAX_PROFILES)
492	return NULL;
493	ptr = ns->profile_ptr[profile];
494	if (ptr)
495	return ptr;
496	entry = kzalloc_obj(*entry, GFP_NOFS \| __GFP_NOWARN);
497	if (mutex_lock_interruptible(&tomoyo_policy_lock))
498	goto out;
499	ptr = ns->profile_ptr[profile];
500	if (!ptr && tomoyo_memory_ok(entry)) {
501	ptr = entry;
502	ptr->default_config = TOMOYO_CONFIG_DISABLED \|
503	TOMOYO_CONFIG_WANT_GRANT_LOG \|
504	TOMOYO_CONFIG_WANT_REJECT_LOG;
505	memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
506	sizeof(ptr->config));
507	ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] =
508	CONFIG_SECURITY_TOMOYO_MAX_AUDIT_LOG;
509	ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] =
510	CONFIG_SECURITY_TOMOYO_MAX_ACCEPT_ENTRY;
511	mb(); /* Avoid out-of-order execution. */
512	ns->profile_ptr[profile] = ptr;
513	entry = NULL;
514	}
515	mutex_unlock(&tomoyo_policy_lock);
516	out:
517	kfree(entry);
518	return ptr;
519	}
520
521	/**
522	* tomoyo_profile - Find a profile.
523	*
524	* @ns: Pointer to "struct tomoyo_policy_namespace".
525	* @profile: Profile number to find.
526	*
527	* Returns pointer to "struct tomoyo_profile".
528	*/
529	struct tomoyo_profile tomoyo_profile(const struct tomoyo_policy_namespace ns,
530	const u8 profile)
531	{
532	static struct tomoyo_profile tomoyo_null_profile;
533	struct tomoyo_profile *ptr = ns->profile_ptr[profile];
534
535	if (!ptr)
536	ptr = &tomoyo_null_profile;
537	return ptr;
538	}
539
540	/**
541	* tomoyo_find_yesno - Find values for specified keyword.
542	*
543	* @string: String to check.
544	* @find: Name of keyword.
545	*
546	* Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise.
547	*/
548	static s8 tomoyo_find_yesno(const char string, const char find)
549	{
550	const char *cp = strstr(string, find);
551
552	if (cp) {
553	cp += strlen(find);
554	if (!strncmp(cp, "=yes", 4))
555	return 1;
556	else if (!strncmp(cp, "=no", 3))
557	return 0;
558	}
559	return -1;
560	}
561
562	/**
563	* tomoyo_set_uint - Set value for specified preference.
564	*
565	* @i: Pointer to "unsigned int".
566	* @string: String to check.
567	* @find: Name of keyword.
568	*
569	* Returns nothing.
570	*/
571	static void tomoyo_set_uint(unsigned int i, const char string,
572	const char *find)
573	{
574	const char *cp = strstr(string, find);
575
576	if (cp)
577	sscanf(cp + strlen(find), "=%u", i);
578	}
579
580	/**
581	* tomoyo_set_mode - Set mode for specified profile.
582	*
583	* @name: Name of functionality.
584	* @value: Mode for @name.
585	* @profile: Pointer to "struct tomoyo_profile".
586	*
587	* Returns 0 on success, negative value otherwise.
588	*/
589	static int tomoyo_set_mode(char name, const char value,
590	struct tomoyo_profile *profile)
591	{
592	u8 i;
593	u8 config;
594
595	if (!strcmp(name, "CONFIG")) {
596	i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
597	config = profile->default_config;
598	} else if (tomoyo_str_starts(&name, "CONFIG::")) {
599	config = 0;
600	for (i = 0; i < TOMOYO_MAX_MAC_INDEX
601	+ TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
602	int len = 0;
603
604	if (i < TOMOYO_MAX_MAC_INDEX) {
605	const u8 c = tomoyo_index2category[i];
606	const char *category =
607	tomoyo_category_keywords[c];
608
609	len = strlen(category);
610	if (strncmp(name, category, len) \|\|
611	name[len++] != ':' \|\| name[len++] != ':')
612	continue;
613	}
614	if (strcmp(name + len, tomoyo_mac_keywords[i]))
615	continue;
616	config = profile->config[i];
617	break;
618	}
619	if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
620	return -EINVAL;
621	} else {
622	return -EINVAL;
623	}
624	if (strstr(value, "use_default")) {
625	config = TOMOYO_CONFIG_USE_DEFAULT;
626	} else {
627	u8 mode;
628
629	for (mode = 0; mode < 4; mode++)
630	if (strstr(value, tomoyo_mode[mode]))
631	/*
632	* Update lower 3 bits in order to distinguish
633	* 'config' from 'TOMOYO_CONFIG_USE_DEFAULT'.
634	*/
635	config = (config & ~7) \| mode;
636	if (config != TOMOYO_CONFIG_USE_DEFAULT) {
637	switch (tomoyo_find_yesno(value, "grant_log")) {
638	case 1:
639	config \|= TOMOYO_CONFIG_WANT_GRANT_LOG;
640	break;
641	case 0:
642	config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG;
643	break;
644	}
645	switch (tomoyo_find_yesno(value, "reject_log")) {
646	case 1:
647	config \|= TOMOYO_CONFIG_WANT_REJECT_LOG;
648	break;
649	case 0:
650	config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG;
651	break;
652	}
653	}
654	}
655	if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
656	profile->config[i] = config;
657	else if (config != TOMOYO_CONFIG_USE_DEFAULT)
658	profile->default_config = config;
659	return 0;
660	}
661
662	/**
663	* tomoyo_write_profile - Write profile table.
664	*
665	* @head: Pointer to "struct tomoyo_io_buffer".
666	*
667	* Returns 0 on success, negative value otherwise.
668	*/
669	static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
670	__must_hold(&head->io_sem)
671	{
672	char *data = head->write_buf;
673	unsigned int i;
674	char *cp;
675	struct tomoyo_profile *profile;
676
677	if (sscanf(data, "PROFILE_VERSION=%u", &head->w.ns->profile_version)
678	== 1)
679	return 0;
680	i = simple_strtoul(data, &cp, 10);
681	if (*cp != '-')
682	return -EINVAL;
683	data = cp + 1;
684	profile = tomoyo_assign_profile(head->w.ns, i);
685	if (!profile)
686	return -EINVAL;
687	cp = strchr(data, '=');
688	if (!cp)
689	return -EINVAL;
690	*cp++ = '\0';
691	if (!strcmp(data, "COMMENT")) {
692	static DEFINE_SPINLOCK(lock);
693	const struct tomoyo_path_info *new_comment
694	= tomoyo_get_name(cp);
695	const struct tomoyo_path_info *old_comment;
696
697	if (!new_comment)
698	return -ENOMEM;
699	spin_lock(&lock);
700	old_comment = profile->comment;
701	profile->comment = new_comment;
702	spin_unlock(&lock);
703	tomoyo_put_name(old_comment);
704	return 0;
705	}
706	if (!strcmp(data, "PREFERENCE")) {
707	for (i = 0; i < TOMOYO_MAX_PREF; i++)
708	tomoyo_set_uint(&profile->pref[i], cp,
709	tomoyo_pref_keywords[i]);
710	return 0;
711	}
712	return tomoyo_set_mode(data, cp, profile);
713	}
714
715	/**
716	* tomoyo_print_config - Print mode for specified functionality.
717	*
718	* @head: Pointer to "struct tomoyo_io_buffer".
719	* @config: Mode for that functionality.
720	*
721	* Returns nothing.
722	*
723	* Caller prints functionality's name.
724	*/
725	static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
726	__must_hold(&head->io_sem)
727	{
728	tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n",
729	tomoyo_mode[config & 3],
730	str_yes_no(config & TOMOYO_CONFIG_WANT_GRANT_LOG),
731	str_yes_no(config & TOMOYO_CONFIG_WANT_REJECT_LOG));
732	}
733
734	/**
735	* tomoyo_read_profile - Read profile table.
736	*
737	* @head: Pointer to "struct tomoyo_io_buffer".
738	*
739	* Returns nothing.
740	*/
741	static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
742	__must_hold(&head->io_sem)
743	{
744	u8 index;
745	struct tomoyo_policy_namespace *ns =
746	container_of(head->r.ns, typeof(*ns), namespace_list);
747	const struct tomoyo_profile *profile;
748
749	if (head->r.eof)
750	return;
751	next:
752	index = head->r.index;
753	profile = ns->profile_ptr[index];
754	switch (head->r.step) {
755	case 0:
756	tomoyo_print_namespace(head);
757	tomoyo_io_printf(head, "PROFILE_VERSION=%u\n",
758	ns->profile_version);
759	head->r.step++;
760	break;
761	case 1:
762	for ( ; head->r.index < TOMOYO_MAX_PROFILES;
763	head->r.index++)
764	if (ns->profile_ptr[head->r.index])
765	break;
766	if (head->r.index == TOMOYO_MAX_PROFILES) {
767	head->r.eof = true;
768	return;
769	}
770	head->r.step++;
771	break;
772	case 2:
773	{
774	u8 i;
775	const struct tomoyo_path_info *comment =
776	profile->comment;
777
778	tomoyo_print_namespace(head);
779	tomoyo_io_printf(head, "%u-COMMENT=", index);
780	tomoyo_set_string(head, comment ? comment->name : "");
781	tomoyo_set_lf(head);
782	tomoyo_print_namespace(head);
783	tomoyo_io_printf(head, "%u-PREFERENCE={ ", index);
784	for (i = 0; i < TOMOYO_MAX_PREF; i++)
785	tomoyo_io_printf(head, "%s=%u ",
786	tomoyo_pref_keywords[i],
787	profile->pref[i]);
788	tomoyo_set_string(head, "}\n");
789	head->r.step++;
790	}
791	break;
792	case 3:
793	{
794	tomoyo_print_namespace(head);
795	tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
796	tomoyo_print_config(head, profile->default_config);
797	head->r.bit = 0;
798	head->r.step++;
799	}
800	break;
801	case 4:
802	for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
803	+ TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
804	const u8 i = head->r.bit;
805	const u8 config = profile->config[i];
806
807	if (config == TOMOYO_CONFIG_USE_DEFAULT)
808	continue;
809	tomoyo_print_namespace(head);
810	if (i < TOMOYO_MAX_MAC_INDEX)
811	tomoyo_io_printf(head, "%u-CONFIG::%s::%s",
812	index,
813	tomoyo_category_keywords
814	[tomoyo_index2category[i]],
815	tomoyo_mac_keywords[i]);
816	else
817	tomoyo_io_printf(head, "%u-CONFIG::%s", index,
818	tomoyo_mac_keywords[i]);
819	tomoyo_print_config(head, config);
820	head->r.bit++;
821	break;
822	}
823	if (head->r.bit == TOMOYO_MAX_MAC_INDEX
824	+ TOMOYO_MAX_MAC_CATEGORY_INDEX) {
825	head->r.index++;
826	head->r.step = 1;
827	}
828	break;
829	}
830	if (tomoyo_flush(head))
831	goto next;
832	}
833
834	/**
835	* tomoyo_same_manager - Check for duplicated "struct tomoyo_manager" entry.
836	*
837	* @a: Pointer to "struct tomoyo_acl_head".
838	* @b: Pointer to "struct tomoyo_acl_head".
839	*
840	* Returns true if @a == @b, false otherwise.
841	*/
842	static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
843	const struct tomoyo_acl_head *b)
844	{
845	return container_of(a, struct tomoyo_manager, head)->manager ==
846	container_of(b, struct tomoyo_manager, head)->manager;
847	}
848
849	/**
850	* tomoyo_update_manager_entry - Add a manager entry.
851	*
852	* @manager: The path to manager or the domainnamme.
853	* @is_delete: True if it is a delete request.
854	*
855	* Returns 0 on success, negative value otherwise.
856	*
857	* Caller holds tomoyo_read_lock().
858	*/
859	static int tomoyo_update_manager_entry(const char *manager,
860	const bool is_delete)
861	__must_hold_shared(&tomoyo_ss)
862	{
863	struct tomoyo_manager e = { };
864	struct tomoyo_acl_param param = {
865	/* .ns = &tomoyo_kernel_namespace, */
866	.is_delete = is_delete,
867	.list = &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER],
868	};
869	int error = is_delete ? -ENOENT : -ENOMEM;
870
871	if (!tomoyo_correct_domain(manager) &&
872	!tomoyo_correct_word(manager))
873	return -EINVAL;
874	e.manager = tomoyo_get_name(manager);
875	if (e.manager) {
876	error = tomoyo_update_policy(&e.head, sizeof(e), &param,
877	tomoyo_same_manager);
878	tomoyo_put_name(e.manager);
879	}
880	return error;
881	}
882
883	/**
884	* tomoyo_write_manager - Write manager policy.
885	*
886	* @head: Pointer to "struct tomoyo_io_buffer".
887	*
888	* Returns 0 on success, negative value otherwise.
889	*
890	* Caller holds tomoyo_read_lock().
891	*/
892	static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
893	__must_hold_shared(&tomoyo_ss)
894	__must_hold(&head->io_sem)
895	{
896	char *data = head->write_buf;
897
898	if (!strcmp(data, "manage_by_non_root")) {
899	tomoyo_manage_by_non_root = !head->w.is_delete;
900	return 0;
901	}
902	return tomoyo_update_manager_entry(data, head->w.is_delete);
903	}
904
905	/**
906	* tomoyo_read_manager - Read manager policy.
907	*
908	* @head: Pointer to "struct tomoyo_io_buffer".
909	*
910	* Caller holds tomoyo_read_lock().
911	*/
912	static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
913	__must_hold_shared(&tomoyo_ss)
914	{
915	if (head->r.eof)
916	return;
917	list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER]) {
918	struct tomoyo_manager *ptr =
919	list_entry(head->r.acl, typeof(*ptr), head.list);
920
921	if (ptr->head.is_deleted)
922	continue;
923	if (!tomoyo_flush(head))
924	return;
925	tomoyo_set_string(head, ptr->manager->name);
926	tomoyo_set_lf(head);
927	}
928	head->r.eof = true;
929	}
930
931	/**
932	* tomoyo_manager - Check whether the current process is a policy manager.
933	*
934	* Returns true if the current process is permitted to modify policy
935	* via /sys/kernel/security/tomoyo/ interface.
936	*
937	* Caller holds tomoyo_read_lock().
938	*/
939	static bool tomoyo_manager(void)
940	__must_hold_shared(&tomoyo_ss)
941	{
942	struct tomoyo_manager *ptr;
943	const char *exe;
944	const struct task_struct *task = current;
945	const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
946	bool found = IS_ENABLED(CONFIG_SECURITY_TOMOYO_INSECURE_BUILTIN_SETTING);
947
948	if (!tomoyo_policy_loaded)
949	return true;
950	if (!tomoyo_manage_by_non_root &&
951	(!uid_eq(task->cred->uid, GLOBAL_ROOT_UID) \|\|
952	!uid_eq(task->cred->euid, GLOBAL_ROOT_UID)))
953	return false;
954	exe = tomoyo_get_exe();
955	if (!exe)
956	return false;
957	list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER], head.list,
958	srcu_read_lock_held(&tomoyo_ss)) {
959	if (!ptr->head.is_deleted &&
960	(!tomoyo_pathcmp(domainname, ptr->manager) \|\|
961	!strcmp(exe, ptr->manager->name))) {
962	found = true;
963	break;
964	}
965	}
966	if (!found) { /* Reduce error messages. */
967	static pid_t last_pid;
968	const pid_t pid = current->pid;
969
970	if (last_pid != pid) {
971	pr_warn("%s ( %s ) is not permitted to update policies.\n",
972	domainname->name, exe);
973	last_pid = pid;
974	}
975	}
976	kfree(exe);
977	return found;
978	}
979
980	static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
981	(unsigned int serial);
982
983	/**
984	* tomoyo_select_domain - Parse select command.
985	*
986	* @head: Pointer to "struct tomoyo_io_buffer".
987	* @data: String to parse.
988	*
989	* Returns true on success, false otherwise.
990	*
991	* Caller holds tomoyo_read_lock().
992	*/
993	static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
994	const char *data)
995	__must_hold_shared(&tomoyo_ss)
996	__must_hold(&head->io_sem)
997	{
998	unsigned int pid;
999	struct tomoyo_domain_info *domain = NULL;
1000	bool global_pid = false;
1001
1002	if (strncmp(data, "select ", 7))
1003	return false;
1004	data += 7;
1005	if (sscanf(data, "pid=%u", &pid) == 1 \|\|
1006	(global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
1007	struct task_struct *p;
1008
1009	rcu_read_lock();
1010	if (global_pid)
1011	p = find_task_by_pid_ns(pid, &init_pid_ns);
1012	else
1013	p = find_task_by_vpid(pid);
1014	if (p)
1015	domain = tomoyo_task(p)->domain_info;
1016	rcu_read_unlock();
1017	} else if (!strncmp(data, "domain=", 7)) {
1018	if (tomoyo_domain_def(data + 7))
1019	domain = tomoyo_find_domain(data + 7);
1020	} else if (sscanf(data, "Q=%u", &pid) == 1) {
1021	domain = tomoyo_find_domain_by_qid(pid);
1022	} else
1023	return false;
1024	head->w.domain = domain;
1025	/* Accessing read_buf is safe because head->io_sem is held. */
1026	if (!head->read_buf)
1027	return true; /* Do nothing if open(O_WRONLY). */
1028	memset(&head->r, 0, sizeof(head->r));
1029	head->r.print_this_domain_only = true;
1030	if (domain)
1031	head->r.domain = &domain->list;
1032	else
1033	head->r.eof = true;
1034	tomoyo_io_printf(head, "# select %s\n", data);
1035	if (domain && domain->is_deleted)
1036	tomoyo_io_printf(head, "# This is a deleted domain.\n");
1037	return true;
1038	}
1039
1040	/**
1041	* tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry.
1042	*
1043	* @a: Pointer to "struct tomoyo_acl_info".
1044	* @b: Pointer to "struct tomoyo_acl_info".
1045	*
1046	* Returns true if @a == @b, false otherwise.
1047	*/
1048	static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a,
1049	const struct tomoyo_acl_info *b)
1050	{
1051	const struct tomoyo_task_acl p1 = container_of(a, typeof(p1), head);
1052	const struct tomoyo_task_acl p2 = container_of(b, typeof(p2), head);
1053
1054	return p1->domainname == p2->domainname;
1055	}
1056
1057	/**
1058	* tomoyo_write_task - Update task related list.
1059	*
1060	* @param: Pointer to "struct tomoyo_acl_param".
1061	*
1062	* Returns 0 on success, negative value otherwise.
1063	*
1064	* Caller holds tomoyo_read_lock().
1065	*/
1066	static int tomoyo_write_task(struct tomoyo_acl_param *param)
1067	__must_hold_shared(&tomoyo_ss)
1068	{
1069	int error = -EINVAL;
1070
1071	if (tomoyo_str_starts(&param->data, "manual_domain_transition ")) {
1072	struct tomoyo_task_acl e = {
1073	.head.type = TOMOYO_TYPE_MANUAL_TASK_ACL,
1074	.domainname = tomoyo_get_domainname(param),
1075	};
1076
1077	if (e.domainname)
1078	error = tomoyo_update_domain(&e.head, sizeof(e), param,
1079	tomoyo_same_task_acl,
1080	NULL);
1081	tomoyo_put_name(e.domainname);
1082	}
1083	return error;
1084	}
1085
1086	/**
1087	* tomoyo_delete_domain - Delete a domain.
1088	*
1089	* @domainname: The name of domain.
1090	*
1091	* Returns 0 on success, negative value otherwise.
1092	*
1093	* Caller holds tomoyo_read_lock().
1094	*/
1095	static int tomoyo_delete_domain(char *domainname)
1096	__must_hold_shared(&tomoyo_ss)
1097	{
1098	struct tomoyo_domain_info *domain;
1099	struct tomoyo_path_info name;
1100
1101	name.name = domainname;
1102	tomoyo_fill_path_info(&name);
1103	if (mutex_lock_interruptible(&tomoyo_policy_lock))
1104	return -EINTR;
1105	/* Is there an active domain? */
1106	list_for_each_entry_rcu(domain, &tomoyo_domain_list, list,
1107	srcu_read_lock_held(&tomoyo_ss)) {
1108	/* Never delete tomoyo_kernel_domain */
1109	if (domain == &tomoyo_kernel_domain)
1110	continue;
1111	if (domain->is_deleted \|\|
1112	tomoyo_pathcmp(domain->domainname, &name))
1113	continue;
1114	domain->is_deleted = true;
1115	break;
1116	}
1117	mutex_unlock(&tomoyo_policy_lock);
1118	return 0;
1119	}
1120
1121	/**
1122	* tomoyo_write_domain2 - Write domain policy.
1123	*
1124	* @ns: Pointer to "struct tomoyo_policy_namespace".
1125	* @list: Pointer to "struct list_head".
1126	* @data: Policy to be interpreted.
1127	* @is_delete: True if it is a delete request.
1128	*
1129	* Returns 0 on success, negative value otherwise.
1130	*
1131	* Caller holds tomoyo_read_lock().
1132	*/
1133	static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
1134	struct list_head list, char data,
1135	const bool is_delete)
1136	__must_hold_shared(&tomoyo_ss)
1137	{
1138	struct tomoyo_acl_param param = {
1139	.ns = ns,
1140	.list = list,
1141	.data = data,
1142	.is_delete = is_delete,
1143	};
1144	static const struct {
1145	const char *keyword;
1146	int (write)(struct tomoyo_acl_param param);
1147	} tomoyo_callback[5] = {
1148	{ "file ", tomoyo_write_file },
1149	{ "network inet ", tomoyo_write_inet_network },
1150	{ "network unix ", tomoyo_write_unix_network },
1151	{ "misc ", tomoyo_write_misc },
1152	{ "task ", tomoyo_write_task },
1153	};
1154	u8 i;
1155
1156	for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) {
1157	if (!tomoyo_str_starts(&param.data,
1158	tomoyo_callback[i].keyword))
1159	continue;
1160	return tomoyo_callback[i].write(&param);
1161	}
1162	return -EINVAL;
1163	}
1164
1165	/* String table for domain flags. */
1166	const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1167	[TOMOYO_DIF_QUOTA_WARNED] = "quota_exceeded\n",
1168	[TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1169	};
1170
1171	/**
1172	* tomoyo_write_domain - Write domain policy.
1173	*
1174	* @head: Pointer to "struct tomoyo_io_buffer".
1175	*
1176	* Returns 0 on success, negative value otherwise.
1177	*
1178	* Caller holds tomoyo_read_lock().
1179	*/
1180	static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1181	__must_hold_shared(&tomoyo_ss)
1182	__must_hold(&head->io_sem)
1183	{
1184	char *data = head->write_buf;
1185	struct tomoyo_policy_namespace *ns;
1186	struct tomoyo_domain_info *domain = head->w.domain;
1187	const bool is_delete = head->w.is_delete;
1188	bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1189	unsigned int idx;
1190
1191	if (*data == '<') {
1192	int ret = 0;
1193
1194	domain = NULL;
1195	if (is_delete)
1196	ret = tomoyo_delete_domain(data);
1197	else if (is_select)
1198	domain = tomoyo_find_domain(data);
1199	else
1200	domain = tomoyo_assign_domain(data, false);
1201	head->w.domain = domain;
1202	return ret;
1203	}
1204	if (!domain)
1205	return -EINVAL;
1206	ns = domain->ns;
1207	if (sscanf(data, "use_profile %u", &idx) == 1
1208	&& idx < TOMOYO_MAX_PROFILES) {
1209	if (!tomoyo_policy_loaded \|\| ns->profile_ptr[idx])
1210	if (!is_delete)
1211	domain->profile = (u8) idx;
1212	return 0;
1213	}
1214	if (sscanf(data, "use_group %u\n", &idx) == 1
1215	&& idx < TOMOYO_MAX_ACL_GROUPS) {
1216	if (!is_delete)
1217	set_bit(idx, domain->group);
1218	else
1219	clear_bit(idx, domain->group);
1220	return 0;
1221	}
1222	for (idx = 0; idx < TOMOYO_MAX_DOMAIN_INFO_FLAGS; idx++) {
1223	const char *cp = tomoyo_dif[idx];
1224
1225	if (strncmp(data, cp, strlen(cp) - 1))
1226	continue;
1227	domain->flags[idx] = !is_delete;
1228	return 0;
1229	}
1230	return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1231	is_delete);
1232	}
1233
1234	/**
1235	* tomoyo_print_condition - Print condition part.
1236	*
1237	* @head: Pointer to "struct tomoyo_io_buffer".
1238	* @cond: Pointer to "struct tomoyo_condition".
1239	*
1240	* Returns true on success, false otherwise.
1241	*/
1242	static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1243	const struct tomoyo_condition *cond)
1244	__must_hold(&head->io_sem)
1245	{
1246	switch (head->r.cond_step) {
1247	case 0:
1248	head->r.cond_index = 0;
1249	head->r.cond_step++;
1250	if (cond->transit) {
1251	tomoyo_set_space(head);
1252	tomoyo_set_string(head, cond->transit->name);
1253	}
1254	fallthrough;
1255	case 1:
1256	{
1257	const u16 condc = cond->condc;
1258	const struct tomoyo_condition_element *condp =
1259	(typeof(condp)) (cond + 1);
1260	const struct tomoyo_number_union *numbers_p =
1261	(typeof(numbers_p)) (condp + condc);
1262	const struct tomoyo_name_union *names_p =
1263	(typeof(names_p))
1264	(numbers_p + cond->numbers_count);
1265	const struct tomoyo_argv *argv =
1266	(typeof(argv)) (names_p + cond->names_count);
1267	const struct tomoyo_envp *envp =
1268	(typeof(envp)) (argv + cond->argc);
1269	u16 skip;
1270
1271	for (skip = 0; skip < head->r.cond_index; skip++) {
1272	const u8 left = condp->left;
1273	const u8 right = condp->right;
1274
1275	condp++;
1276	switch (left) {
1277	case TOMOYO_ARGV_ENTRY:
1278	argv++;
1279	continue;
1280	case TOMOYO_ENVP_ENTRY:
1281	envp++;
1282	continue;
1283	case TOMOYO_NUMBER_UNION:
1284	numbers_p++;
1285	break;
1286	}
1287	switch (right) {
1288	case TOMOYO_NAME_UNION:
1289	names_p++;
1290	break;
1291	case TOMOYO_NUMBER_UNION:
1292	numbers_p++;
1293	break;
1294	}
1295	}
1296	while (head->r.cond_index < condc) {
1297	const u8 match = condp->equals;
1298	const u8 left = condp->left;
1299	const u8 right = condp->right;
1300
1301	if (!tomoyo_flush(head))
1302	return false;
1303	condp++;
1304	head->r.cond_index++;
1305	tomoyo_set_space(head);
1306	switch (left) {
1307	case TOMOYO_ARGV_ENTRY:
1308	tomoyo_io_printf(head,
1309	"exec.argv[%lu]%s=\"",
1310	argv->index, argv->is_not ? "!" : "");
1311	tomoyo_set_string(head,
1312	argv->value->name);
1313	tomoyo_set_string(head, "\"");
1314	argv++;
1315	continue;
1316	case TOMOYO_ENVP_ENTRY:
1317	tomoyo_set_string(head,
1318	"exec.envp[\"");
1319	tomoyo_set_string(head,
1320	envp->name->name);
1321	tomoyo_io_printf(head, "\"]%s=", envp->is_not ? "!" : "");
1322	if (envp->value) {
1323	tomoyo_set_string(head, "\"");
1324	tomoyo_set_string(head, envp->value->name);
1325	tomoyo_set_string(head, "\"");
1326	} else {
1327	tomoyo_set_string(head,
1328	"NULL");
1329	}
1330	envp++;
1331	continue;
1332	case TOMOYO_NUMBER_UNION:
1333	tomoyo_print_number_union_nospace
1334	(head, numbers_p++);
1335	break;
1336	default:
1337	tomoyo_set_string(head,
1338	tomoyo_condition_keyword[left]);
1339	break;
1340	}
1341	tomoyo_set_string(head, match ? "=" : "!=");
1342	switch (right) {
1343	case TOMOYO_NAME_UNION:
1344	tomoyo_print_name_union_quoted
1345	(head, names_p++);
1346	break;
1347	case TOMOYO_NUMBER_UNION:
1348	tomoyo_print_number_union_nospace
1349	(head, numbers_p++);
1350	break;
1351	default:
1352	tomoyo_set_string(head,
1353	tomoyo_condition_keyword[right]);
1354	break;
1355	}
1356	}
1357	}
1358	head->r.cond_step++;
1359	fallthrough;
1360	case 2:
1361	if (!tomoyo_flush(head))
1362	break;
1363	head->r.cond_step++;
1364	fallthrough;
1365	case 3:
1366	if (cond->grant_log != TOMOYO_GRANTLOG_AUTO)
1367	tomoyo_io_printf(head, " grant_log=%s",
1368	str_yes_no(cond->grant_log ==
1369	TOMOYO_GRANTLOG_YES));
1370	tomoyo_set_lf(head);
1371	return true;
1372	}
1373	return false;
1374	}
1375
1376	/**
1377	* tomoyo_set_group - Print "acl_group " header keyword and category name.
1378	*
1379	* @head: Pointer to "struct tomoyo_io_buffer".
1380	* @category: Category name.
1381	*
1382	* Returns nothing.
1383	*/
1384	static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1385	const char *category)
1386	__must_hold(&head->io_sem)
1387	{
1388	if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1389	tomoyo_print_namespace(head);
1390	tomoyo_io_printf(head, "acl_group %u ",
1391	head->r.acl_group_index);
1392	}
1393	tomoyo_set_string(head, category);
1394	}
1395
1396	/**
1397	* tomoyo_print_entry - Print an ACL entry.
1398	*
1399	* @head: Pointer to "struct tomoyo_io_buffer".
1400	* @acl: Pointer to an ACL entry.
1401	*
1402	* Returns true on success, false otherwise.
1403	*/
1404	static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1405	struct tomoyo_acl_info *acl)
1406	__must_hold(&head->io_sem)
1407	{
1408	const u8 acl_type = acl->type;
1409	bool first = true;
1410	u8 bit;
1411
1412	if (head->r.print_cond_part)
1413	goto print_cond_part;
1414	if (acl->is_deleted)
1415	return true;
1416	if (!tomoyo_flush(head))
1417	return false;
1418	else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1419	struct tomoyo_path_acl *ptr =
1420	container_of(acl, typeof(*ptr), head);
1421	const u16 perm = ptr->perm;
1422
1423	for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1424	if (!(perm & (1 << bit)))
1425	continue;
1426	if (head->r.print_transition_related_only &&
1427	bit != TOMOYO_TYPE_EXECUTE)
1428	continue;
1429	if (first) {
1430	tomoyo_set_group(head, "file ");
1431	first = false;
1432	} else {
1433	tomoyo_set_slash(head);
1434	}
1435	tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1436	}
1437	if (first)
1438	return true;
1439	tomoyo_print_name_union(head, &ptr->name);
1440	} else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) {
1441	struct tomoyo_task_acl *ptr =
1442	container_of(acl, typeof(*ptr), head);
1443
1444	tomoyo_set_group(head, "task ");
1445	tomoyo_set_string(head, "manual_domain_transition ");
1446	tomoyo_set_string(head, ptr->domainname->name);
1447	} else if (head->r.print_transition_related_only) {
1448	return true;
1449	} else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1450	struct tomoyo_path2_acl *ptr =
1451	container_of(acl, typeof(*ptr), head);
1452	const u8 perm = ptr->perm;
1453
1454	for (bit = 0; bit < TOMOYO_MAX_PATH2_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_pp2mac[bit]]);
1465	}
1466	if (first)
1467	return true;
1468	tomoyo_print_name_union(head, &ptr->name1);
1469	tomoyo_print_name_union(head, &ptr->name2);
1470	} else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1471	struct tomoyo_path_number_acl *ptr =
1472	container_of(acl, typeof(*ptr), head);
1473	const u8 perm = ptr->perm;
1474
1475	for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_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_pn2mac[bit]]);
1486	}
1487	if (first)
1488	return true;
1489	tomoyo_print_name_union(head, &ptr->name);
1490	tomoyo_print_number_union(head, &ptr->number);
1491	} else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1492	struct tomoyo_mkdev_acl *ptr =
1493	container_of(acl, typeof(*ptr), head);
1494	const u8 perm = ptr->perm;
1495
1496	for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1497	if (!(perm & (1 << bit)))
1498	continue;
1499	if (first) {
1500	tomoyo_set_group(head, "file ");
1501	first = false;
1502	} else {
1503	tomoyo_set_slash(head);
1504	}
1505	tomoyo_set_string(head, tomoyo_mac_keywords
1506	[tomoyo_pnnn2mac[bit]]);
1507	}
1508	if (first)
1509	return true;
1510	tomoyo_print_name_union(head, &ptr->name);
1511	tomoyo_print_number_union(head, &ptr->mode);
1512	tomoyo_print_number_union(head, &ptr->major);
1513	tomoyo_print_number_union(head, &ptr->minor);
1514	} else if (acl_type == TOMOYO_TYPE_INET_ACL) {
1515	struct tomoyo_inet_acl *ptr =
1516	container_of(acl, typeof(*ptr), head);
1517	const u8 perm = ptr->perm;
1518
1519	for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1520	if (!(perm & (1 << bit)))
1521	continue;
1522	if (first) {
1523	tomoyo_set_group(head, "network inet ");
1524	tomoyo_set_string(head, tomoyo_proto_keyword
1525	[ptr->protocol]);
1526	tomoyo_set_space(head);
1527	first = false;
1528	} else {
1529	tomoyo_set_slash(head);
1530	}
1531	tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1532	}
1533	if (first)
1534	return true;
1535	tomoyo_set_space(head);
1536	if (ptr->address.group) {
1537	tomoyo_set_string(head, "@");
1538	tomoyo_set_string(head, ptr->address.group->group_name
1539	->name);
1540	} else {
1541	char buf[128];
1542
1543	tomoyo_print_ip(buf, sizeof(buf), &ptr->address);
1544	tomoyo_io_printf(head, "%s", buf);
1545	}
1546	tomoyo_print_number_union(head, &ptr->port);
1547	} else if (acl_type == TOMOYO_TYPE_UNIX_ACL) {
1548	struct tomoyo_unix_acl *ptr =
1549	container_of(acl, typeof(*ptr), head);
1550	const u8 perm = ptr->perm;
1551
1552	for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1553	if (!(perm & (1 << bit)))
1554	continue;
1555	if (first) {
1556	tomoyo_set_group(head, "network unix ");
1557	tomoyo_set_string(head, tomoyo_proto_keyword
1558	[ptr->protocol]);
1559	tomoyo_set_space(head);
1560	first = false;
1561	} else {
1562	tomoyo_set_slash(head);
1563	}
1564	tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1565	}
1566	if (first)
1567	return true;
1568	tomoyo_print_name_union(head, &ptr->name);
1569	} else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1570	struct tomoyo_mount_acl *ptr =
1571	container_of(acl, typeof(*ptr), head);
1572
1573	tomoyo_set_group(head, "file mount");
1574	tomoyo_print_name_union(head, &ptr->dev_name);
1575	tomoyo_print_name_union(head, &ptr->dir_name);
1576	tomoyo_print_name_union(head, &ptr->fs_type);
1577	tomoyo_print_number_union(head, &ptr->flags);
1578	} else if (acl_type == TOMOYO_TYPE_ENV_ACL) {
1579	struct tomoyo_env_acl *ptr =
1580	container_of(acl, typeof(*ptr), head);
1581
1582	tomoyo_set_group(head, "misc env ");
1583	tomoyo_set_string(head, ptr->env->name);
1584	}
1585	if (acl->cond) {
1586	head->r.print_cond_part = true;
1587	head->r.cond_step = 0;
1588	if (!tomoyo_flush(head))
1589	return false;
1590	print_cond_part:
1591	if (!tomoyo_print_condition(head, acl->cond))
1592	return false;
1593	head->r.print_cond_part = false;
1594	} else {
1595	tomoyo_set_lf(head);
1596	}
1597	return true;
1598	}
1599
1600	/**
1601	* tomoyo_read_domain2 - Read domain policy.
1602	*
1603	* @head: Pointer to "struct tomoyo_io_buffer".
1604	* @list: Pointer to "struct list_head".
1605	*
1606	* Caller holds tomoyo_read_lock().
1607	*
1608	* Returns true on success, false otherwise.
1609	*/
1610	static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1611	struct list_head *list)
1612	__must_hold_shared(&tomoyo_ss)
1613	__must_hold(&head->io_sem)
1614	{
1615	list_for_each_cookie(head->r.acl, list) {
1616	struct tomoyo_acl_info *ptr =
1617	list_entry(head->r.acl, typeof(*ptr), list);
1618
1619	if (!tomoyo_print_entry(head, ptr))
1620	return false;
1621	}
1622	head->r.acl = NULL;
1623	return true;
1624	}
1625
1626	/**
1627	* tomoyo_read_domain - Read domain policy.
1628	*
1629	* @head: Pointer to "struct tomoyo_io_buffer".
1630	*
1631	* Caller holds tomoyo_read_lock().
1632	*/
1633	static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1634	__must_hold_shared(&tomoyo_ss)
1635	__must_hold(&head->io_sem)
1636	{
1637	if (head->r.eof)
1638	return;
1639	list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1640	struct tomoyo_domain_info *domain =
1641	list_entry(head->r.domain, typeof(*domain), list);
1642	u8 i;
1643
1644	switch (head->r.step) {
1645	case 0:
1646	if (domain->is_deleted &&
1647	!head->r.print_this_domain_only)
1648	continue;
1649	/* Print domainname and flags. */
1650	tomoyo_set_string(head, domain->domainname->name);
1651	tomoyo_set_lf(head);
1652	tomoyo_io_printf(head, "use_profile %u\n",
1653	domain->profile);
1654	for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1655	if (domain->flags[i])
1656	tomoyo_set_string(head, tomoyo_dif[i]);
1657	head->r.index = 0;
1658	head->r.step++;
1659	fallthrough;
1660	case 1:
1661	while (head->r.index < TOMOYO_MAX_ACL_GROUPS) {
1662	i = head->r.index++;
1663	if (!test_bit(i, domain->group))
1664	continue;
1665	tomoyo_io_printf(head, "use_group %u\n", i);
1666	if (!tomoyo_flush(head))
1667	return;
1668	}
1669	head->r.index = 0;
1670	head->r.step++;
1671	tomoyo_set_lf(head);
1672	fallthrough;
1673	case 2:
1674	if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1675	return;
1676	head->r.step++;
1677	if (!tomoyo_set_lf(head))
1678	return;
1679	fallthrough;
1680	case 3:
1681	head->r.step = 0;
1682	if (head->r.print_this_domain_only)
1683	goto done;
1684	}
1685	}
1686	done:
1687	head->r.eof = true;
1688	}
1689
1690	/**
1691	* tomoyo_write_pid: Specify PID to obtain domainname.
1692	*
1693	* @head: Pointer to "struct tomoyo_io_buffer".
1694	*
1695	* Returns 0.
1696	*/
1697	static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1698	{
1699	head->r.eof = false;
1700	return 0;
1701	}
1702
1703	/**
1704	* tomoyo_read_pid - Get domainname of the specified PID.
1705	*
1706	* @head: Pointer to "struct tomoyo_io_buffer".
1707	*
1708	* Returns the domainname which the specified PID is in on success,
1709	* empty string otherwise.
1710	* The PID is specified by tomoyo_write_pid() so that the user can obtain
1711	* using read()/write() interface rather than sysctl() interface.
1712	*/
1713	static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1714	__must_hold(&head->io_sem)
1715	{
1716	char *buf = head->write_buf;
1717	bool global_pid = false;
1718	unsigned int pid;
1719	struct task_struct *p;
1720	struct tomoyo_domain_info *domain = NULL;
1721
1722	/* Accessing write_buf is safe because head->io_sem is held. */
1723	if (!buf) {
1724	head->r.eof = true;
1725	return; /* Do nothing if open(O_RDONLY). */
1726	}
1727	if (head->r.w_pos \|\| head->r.eof)
1728	return;
1729	head->r.eof = true;
1730	if (tomoyo_str_starts(&buf, "global-pid "))
1731	global_pid = true;
1732	if (kstrtouint(buf, 10, &pid))
1733	return;
1734	rcu_read_lock();
1735	if (global_pid)
1736	p = find_task_by_pid_ns(pid, &init_pid_ns);
1737	else
1738	p = find_task_by_vpid(pid);
1739	if (p)
1740	domain = tomoyo_task(p)->domain_info;
1741	rcu_read_unlock();
1742	if (!domain)
1743	return;
1744	tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1745	tomoyo_set_string(head, domain->domainname->name);
1746	}
1747
1748	/* String table for domain transition control keywords. */
1749	static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1750	[TOMOYO_TRANSITION_CONTROL_NO_RESET] = "no_reset_domain ",
1751	[TOMOYO_TRANSITION_CONTROL_RESET] = "reset_domain ",
1752	[TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1753	[TOMOYO_TRANSITION_CONTROL_INITIALIZE] = "initialize_domain ",
1754	[TOMOYO_TRANSITION_CONTROL_NO_KEEP] = "no_keep_domain ",
1755	[TOMOYO_TRANSITION_CONTROL_KEEP] = "keep_domain ",
1756	};
1757
1758	/* String table for grouping keywords. */
1759	static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1760	[TOMOYO_PATH_GROUP] = "path_group ",
1761	[TOMOYO_NUMBER_GROUP] = "number_group ",
1762	[TOMOYO_ADDRESS_GROUP] = "address_group ",
1763	};
1764
1765	/**
1766	* tomoyo_write_exception - Write exception policy.
1767	*
1768	* @head: Pointer to "struct tomoyo_io_buffer".
1769	*
1770	* Returns 0 on success, negative value otherwise.
1771	*
1772	* Caller holds tomoyo_read_lock().
1773	*/
1774	static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1775	__must_hold_shared(&tomoyo_ss)
1776	__must_hold(&head->io_sem)
1777	{
1778	const bool is_delete = head->w.is_delete;
1779	struct tomoyo_acl_param param = {
1780	.ns = head->w.ns,
1781	.is_delete = is_delete,
1782	.data = head->write_buf,
1783	};
1784	u8 i;
1785
1786	if (tomoyo_str_starts(&param.data, "aggregator "))
1787	return tomoyo_write_aggregator(&param);
1788	for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1789	if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
1790	return tomoyo_write_transition_control(&param, i);
1791	for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1792	if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
1793	return tomoyo_write_group(&param, i);
1794	if (tomoyo_str_starts(&param.data, "acl_group ")) {
1795	unsigned int group;
1796	char *data;
1797
1798	group = simple_strtoul(param.data, &data, 10);
1799	if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1800	return tomoyo_write_domain2
1801	(head->w.ns, &head->w.ns->acl_group[group],
1802	data, is_delete);
1803	}
1804	return -EINVAL;
1805	}
1806
1807	/**
1808	* tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
1809	*
1810	* @head: Pointer to "struct tomoyo_io_buffer".
1811	* @idx: Index number.
1812	*
1813	* Returns true on success, false otherwise.
1814	*
1815	* Caller holds tomoyo_read_lock().
1816	*/
1817	static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1818	__must_hold_shared(&tomoyo_ss)
1819	__must_hold(&head->io_sem)
1820	{
1821	struct tomoyo_policy_namespace *ns =
1822	container_of(head->r.ns, typeof(*ns), namespace_list);
1823	struct list_head *list = &ns->group_list[idx];
1824
1825	list_for_each_cookie(head->r.group, list) {
1826	struct tomoyo_group *group =
1827	list_entry(head->r.group, typeof(*group), head.list);
1828
1829	list_for_each_cookie(head->r.acl, &group->member_list) {
1830	struct tomoyo_acl_head *ptr =
1831	list_entry(head->r.acl, typeof(*ptr), list);
1832
1833	if (ptr->is_deleted)
1834	continue;
1835	if (!tomoyo_flush(head))
1836	return false;
1837	tomoyo_print_namespace(head);
1838	tomoyo_set_string(head, tomoyo_group_name[idx]);
1839	tomoyo_set_string(head, group->group_name->name);
1840	if (idx == TOMOYO_PATH_GROUP) {
1841	tomoyo_set_space(head);
1842	tomoyo_set_string(head, container_of
1843	(ptr, struct tomoyo_path_group,
1844	head)->member_name->name);
1845	} else if (idx == TOMOYO_NUMBER_GROUP) {
1846	tomoyo_print_number_union(head, &container_of
1847	(ptr,
1848	struct tomoyo_number_group,
1849	head)->number);
1850	} else if (idx == TOMOYO_ADDRESS_GROUP) {
1851	char buffer[128];
1852	struct tomoyo_address_group *member =
1853	container_of(ptr, typeof(*member),
1854	head);
1855
1856	tomoyo_print_ip(buffer, sizeof(buffer),
1857	&member->address);
1858	tomoyo_io_printf(head, " %s", buffer);
1859	}
1860	tomoyo_set_lf(head);
1861	}
1862	head->r.acl = NULL;
1863	}
1864	head->r.group = NULL;
1865	return true;
1866	}
1867
1868	/**
1869	* tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1870	*
1871	* @head: Pointer to "struct tomoyo_io_buffer".
1872	* @idx: Index number.
1873	*
1874	* Returns true on success, false otherwise.
1875	*
1876	* Caller holds tomoyo_read_lock().
1877	*/
1878	static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1879	__must_hold_shared(&tomoyo_ss)
1880	{
1881	struct tomoyo_policy_namespace *ns =
1882	container_of(head->r.ns, typeof(*ns), namespace_list);
1883	struct list_head *list = &ns->policy_list[idx];
1884
1885	list_for_each_cookie(head->r.acl, list) {
1886	struct tomoyo_acl_head *acl =
1887	container_of(head->r.acl, typeof(*acl), list);
1888	if (acl->is_deleted)
1889	continue;
1890	if (!tomoyo_flush(head))
1891	return false;
1892	switch (idx) {
1893	case TOMOYO_ID_TRANSITION_CONTROL:
1894	{
1895	struct tomoyo_transition_control *ptr =
1896	container_of(acl, typeof(*ptr), head);
1897
1898	tomoyo_print_namespace(head);
1899	tomoyo_set_string(head, tomoyo_transition_type
1900	[ptr->type]);
1901	tomoyo_set_string(head, ptr->program ?
1902	ptr->program->name : "any");
1903	tomoyo_set_string(head, " from ");
1904	tomoyo_set_string(head, ptr->domainname ?
1905	ptr->domainname->name :
1906	"any");
1907	}
1908	break;
1909	case TOMOYO_ID_AGGREGATOR:
1910	{
1911	struct tomoyo_aggregator *ptr =
1912	container_of(acl, typeof(*ptr), head);
1913
1914	tomoyo_print_namespace(head);
1915	tomoyo_set_string(head, "aggregator ");
1916	tomoyo_set_string(head,
1917	ptr->original_name->name);
1918	tomoyo_set_space(head);
1919	tomoyo_set_string(head,
1920	ptr->aggregated_name->name);
1921	}
1922	break;
1923	default:
1924	continue;
1925	}
1926	tomoyo_set_lf(head);
1927	}
1928	head->r.acl = NULL;
1929	return true;
1930	}
1931
1932	/**
1933	* tomoyo_read_exception - Read exception policy.
1934	*
1935	* @head: Pointer to "struct tomoyo_io_buffer".
1936	*
1937	* Caller holds tomoyo_read_lock().
1938	*/
1939	static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1940	__must_hold_shared(&tomoyo_ss)
1941	__must_hold(&head->io_sem)
1942	{
1943	struct tomoyo_policy_namespace *ns =
1944	container_of(head->r.ns, typeof(*ns), namespace_list);
1945
1946	if (head->r.eof)
1947	return;
1948	while (head->r.step < TOMOYO_MAX_POLICY &&
1949	tomoyo_read_policy(head, head->r.step))
1950	head->r.step++;
1951	if (head->r.step < TOMOYO_MAX_POLICY)
1952	return;
1953	while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1954	tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1955	head->r.step++;
1956	if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1957	return;
1958	while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1959	+ TOMOYO_MAX_ACL_GROUPS) {
1960	head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1961	- TOMOYO_MAX_GROUP;
1962	if (!tomoyo_read_domain2(head, &ns->acl_group
1963	[head->r.acl_group_index]))
1964	return;
1965	head->r.step++;
1966	}
1967	head->r.eof = true;
1968	}
1969
1970	/* Wait queue for kernel -> userspace notification. */
1971	static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1972	/* Wait queue for userspace -> kernel notification. */
1973	static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1974
1975	/* Structure for query. */
1976	struct tomoyo_query {
1977	struct list_head list;
1978	struct tomoyo_domain_info *domain;
1979	char *query;
1980	size_t query_len;
1981	unsigned int serial;
1982	u8 timer;
1983	u8 answer;
1984	u8 retry;
1985	};
1986
1987	/* The list for "struct tomoyo_query". */
1988	static LIST_HEAD(tomoyo_query_list);
1989
1990	/* Lock for manipulating tomoyo_query_list. */
1991	static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1992
1993	/*
1994	* Number of "struct file" referring /sys/kernel/security/tomoyo/query
1995	* interface.
1996	*/
1997	static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1998
1999	/**
2000	* tomoyo_truncate - Truncate a line.
2001	*
2002	* @str: String to truncate.
2003	*
2004	* Returns length of truncated @str.
2005	*/
2006	static int tomoyo_truncate(char *str)
2007	{
2008	char *start = str;
2009
2010	while ((unsigned char ) str > (unsigned char) ' ')
2011	str++;
2012	*str = '\0';
2013	return strlen(start) + 1;
2014	}
2015
2016	/**
2017	* tomoyo_numscan - sscanf() which stores the length of a decimal integer value.
2018	*
2019	* @str: String to scan.
2020	* @head: Leading string that must start with.
2021	* @width: Pointer to "int" for storing length of a decimal integer value after @head.
2022	* @tail: Optional character that must match after a decimal integer value.
2023	*
2024	* Returns whether @str starts with @head and a decimal value follows @head.
2025	*/
2026	static bool tomoyo_numscan(const char str, const char head, int *width, const char tail)
2027	{
2028	const char *cp;
2029	const int n = strlen(head);
2030
2031	if (!strncmp(str, head, n)) {
2032	cp = str + n;
2033	while (cp && cp >= '0' && *cp <= '9')
2034	cp++;
2035	if (*cp == tail \|\| !tail) {
2036	*width = cp - (str + n);
2037	return *width != 0;
2038	}
2039	}
2040	*width = 0;
2041	return 0;
2042	}
2043
2044	/**
2045	* tomoyo_patternize_path - Make patterns for file path. Used by learning mode.
2046	*
2047	* @buffer: Destination buffer.
2048	* @len: Size of @buffer.
2049	* @entry: Original line.
2050	*
2051	* Returns nothing.
2052	*/
2053	static void tomoyo_patternize_path(char buffer, const int len, char entry)
2054	{
2055	int width;
2056	char *cp = entry;
2057
2058	/* Nothing to do if this line is not for "file" related entry. */
2059	if (strncmp(entry, "file ", 5))
2060	goto flush;
2061	/*
2062	* Nothing to do if there is no colon in this line, for this rewriting
2063	* applies to only filesystems where numeric values in the path are volatile.
2064	*/
2065	cp = strchr(entry + 5, ':');
2066	if (!cp) {
2067	cp = entry;
2068	goto flush;
2069	}
2070	/* Flush e.g. "file ioctl" part. */
2071	while (*cp != ' ')
2072	cp--;
2073	*cp++ = '\0';
2074	tomoyo_addprintf(buffer, len, "%s ", entry);
2075	/* e.g. file ioctl pipe:[$INO] $CMD */
2076	if (tomoyo_numscan(cp, "pipe:[", &width, ']')) {
2077	cp += width + 7;
2078	tomoyo_addprintf(buffer, len, "pipe:[\\$]");
2079	goto flush;
2080	}
2081	/* e.g. file ioctl socket:[$INO] $CMD */
2082	if (tomoyo_numscan(cp, "socket:[", &width, ']')) {
2083	cp += width + 9;
2084	tomoyo_addprintf(buffer, len, "socket:[\\$]");
2085	goto flush;
2086	}
2087	if (!strncmp(cp, "proc:/self", 10)) {
2088	/* e.g. file read proc:/self/task/$TID/fdinfo/$FD */
2089	cp += 10;
2090	tomoyo_addprintf(buffer, len, "proc:/self");
2091	} else if (tomoyo_numscan(cp, "proc:/", &width, 0)) {
2092	/* e.g. file read proc:/$PID/task/$TID/fdinfo/$FD */
2093	/*
2094	* Don't patternize $PID part if $PID == 1, for several
2095	* programs access only files in /proc/1/ directory.
2096	*/
2097	cp += width + 6;
2098	if (width == 1 && *(cp - 1) == '1')
2099	tomoyo_addprintf(buffer, len, "proc:/1");
2100	else
2101	tomoyo_addprintf(buffer, len, "proc:/\\$");
2102	} else {
2103	goto flush;
2104	}
2105	/* Patternize $TID part if "/task/" follows. */
2106	if (tomoyo_numscan(cp, "/task/", &width, 0)) {
2107	cp += width + 6;
2108	tomoyo_addprintf(buffer, len, "/task/\\$");
2109	}
2110	/* Patternize $FD part if "/fd/" or "/fdinfo/" follows. */
2111	if (tomoyo_numscan(cp, "/fd/", &width, 0)) {
2112	cp += width + 4;
2113	tomoyo_addprintf(buffer, len, "/fd/\\$");
2114	} else if (tomoyo_numscan(cp, "/fdinfo/", &width, 0)) {
2115	cp += width + 8;
2116	tomoyo_addprintf(buffer, len, "/fdinfo/\\$");
2117	}
2118	flush:
2119	/* Flush remaining part if any. */
2120	if (*cp)
2121	tomoyo_addprintf(buffer, len, "%s", cp);
2122	}
2123
2124	/**
2125	* tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
2126	*
2127	* @domain: Pointer to "struct tomoyo_domain_info".
2128	* @header: Lines containing ACL.
2129	*
2130	* Returns nothing.
2131	*/
2132	static void tomoyo_add_entry(struct tomoyo_domain_info domain, char header)
2133	__must_hold_shared(&tomoyo_ss)
2134	{
2135	char *buffer;
2136	char *realpath = NULL;
2137	char *argv0 = NULL;
2138	char *symlink = NULL;
2139	char *cp = strchr(header, '\n');
2140	int len;
2141
2142	if (!cp)
2143	return;
2144	cp = strchr(cp + 1, '\n');
2145	if (!cp)
2146	return;
2147	*cp++ = '\0';
2148	/* Reserve some space for potentially using patterns. */
2149	len = strlen(cp) + 16;
2150	/* strstr() will return NULL if ordering is wrong. */
2151	if (*cp == 'f') {
2152	argv0 = strstr(header, " argv[]={ \"");
2153	if (argv0) {
2154	argv0 += 10;
2155	len += tomoyo_truncate(argv0) + 14;
2156	}
2157	realpath = strstr(header, " exec={ realpath=\"");
2158	if (realpath) {
2159	realpath += 8;
2160	len += tomoyo_truncate(realpath) + 6;
2161	}
2162	symlink = strstr(header, " symlink.target=\"");
2163	if (symlink)
2164	len += tomoyo_truncate(symlink + 1) + 1;
2165	}
2166	buffer = kmalloc(len, GFP_NOFS \| __GFP_ZERO);
2167	if (!buffer)
2168	return;
2169	tomoyo_patternize_path(buffer, len, cp);
2170	if (realpath)
2171	tomoyo_addprintf(buffer, len, " exec.%s", realpath);
2172	if (argv0)
2173	tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
2174	if (symlink)
2175	tomoyo_addprintf(buffer, len, "%s", symlink);
2176	tomoyo_normalize_line(buffer);
2177	if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
2178	false))
2179	tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2180	kfree(buffer);
2181	}
2182
2183	/**
2184	* tomoyo_supervisor - Ask for the supervisor's decision.
2185	*
2186	* @r: Pointer to "struct tomoyo_request_info".
2187	* @fmt: The printf()'s format string, followed by parameters.
2188	*
2189	* Returns 0 if the supervisor decided to permit the access request which
2190	* violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
2191	* supervisor decided to retry the access request which violated the policy in
2192	* enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
2193	*/
2194	int tomoyo_supervisor(struct tomoyo_request_info r, const char fmt, ...)
2195	{
2196	va_list args;
2197	int error;
2198	int len;
2199	static unsigned int tomoyo_serial;
2200	struct tomoyo_query entry = { };
2201	bool quota_exceeded = false;
2202
2203	va_start(args, fmt);
2204	len = vsnprintf(NULL, 0, fmt, args) + 1;
2205	va_end(args);
2206	/* Write /sys/kernel/security/tomoyo/audit. */
2207	va_start(args, fmt);
2208	tomoyo_write_log2(r, len, fmt, args);
2209	va_end(args);
2210	/* Nothing more to do if granted. */
2211	if (r->granted)
2212	return 0;
2213	if (r->mode)
2214	tomoyo_update_stat(r->mode);
2215	switch (r->mode) {
2216	case TOMOYO_CONFIG_ENFORCING:
2217	error = -EPERM;
2218	if (atomic_read(&tomoyo_query_observers))
2219	break;
2220	goto out;
2221	case TOMOYO_CONFIG_LEARNING:
2222	error = 0;
2223	/* Check max_learning_entry parameter. */
2224	if (tomoyo_domain_quota_is_ok(r))
2225	break;
2226	fallthrough;
2227	default:
2228	return 0;
2229	}
2230	/* Get message. */
2231	va_start(args, fmt);
2232	entry.query = tomoyo_init_log(r, len, fmt, args);
2233	va_end(args);
2234	if (!entry.query)
2235	goto out;
2236	entry.query_len = strlen(entry.query) + 1;
2237	if (!error) {
2238	tomoyo_add_entry(r->domain, entry.query);
2239	goto out;
2240	}
2241	len = kmalloc_size_roundup(entry.query_len);
2242	entry.domain = r->domain;
2243	spin_lock(&tomoyo_query_list_lock);
2244	if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
2245	tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
2246	>= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
2247	quota_exceeded = true;
2248	} else {
2249	entry.serial = tomoyo_serial++;
2250	entry.retry = r->retry;
2251	tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
2252	list_add_tail(&entry.list, &tomoyo_query_list);
2253	}
2254	spin_unlock(&tomoyo_query_list_lock);
2255	if (quota_exceeded)
2256	goto out;
2257	/* Give 10 seconds for supervisor's opinion. */
2258	while (entry.timer < 10) {
2259	wake_up_all(&tomoyo_query_wait);
2260	if (wait_event_interruptible_timeout
2261	(tomoyo_answer_wait, entry.answer \|\|
2262	!atomic_read(&tomoyo_query_observers), HZ))
2263	break;
2264	entry.timer++;
2265	}
2266	spin_lock(&tomoyo_query_list_lock);
2267	list_del(&entry.list);
2268	tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
2269	spin_unlock(&tomoyo_query_list_lock);
2270	switch (entry.answer) {
2271	case 3: /* Asked to retry by administrator. */
2272	error = TOMOYO_RETRY_REQUEST;
2273	r->retry++;
2274	break;
2275	case 1:
2276	/* Granted by administrator. */
2277	error = 0;
2278	break;
2279	default:
2280	/* Timed out or rejected by administrator. */
2281	break;
2282	}
2283	out:
2284	kfree(entry.query);
2285	return error;
2286	}
2287
2288	/**
2289	* tomoyo_find_domain_by_qid - Get domain by query id.
2290	*
2291	* @serial: Query ID assigned by tomoyo_supervisor().
2292	*
2293	* Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
2294	*/
2295	static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
2296	(unsigned int serial)
2297	{
2298	struct tomoyo_query *ptr;
2299	struct tomoyo_domain_info *domain = NULL;
2300
2301	spin_lock(&tomoyo_query_list_lock);
2302	list_for_each_entry(ptr, &tomoyo_query_list, list) {
2303	if (ptr->serial != serial)
2304	continue;
2305	domain = ptr->domain;
2306	break;
2307	}
2308	spin_unlock(&tomoyo_query_list_lock);
2309	return domain;
2310	}
2311
2312	/**
2313	* tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
2314	*
2315	* @file: Pointer to "struct file".
2316	* @wait: Pointer to "poll_table".
2317	*
2318	* Returns EPOLLIN \| EPOLLRDNORM when ready to read, 0 otherwise.
2319	*
2320	* Waits for access requests which violated policy in enforcing mode.
2321	*/
2322	static __poll_t tomoyo_poll_query(struct file file, poll_table wait)
2323	{
2324	if (!list_empty(&tomoyo_query_list))
2325	return EPOLLIN \| EPOLLRDNORM;
2326	poll_wait(file, &tomoyo_query_wait, wait);
2327	if (!list_empty(&tomoyo_query_list))
2328	return EPOLLIN \| EPOLLRDNORM;
2329	return 0;
2330	}
2331
2332	/**
2333	* tomoyo_read_query - Read access requests which violated policy in enforcing mode.
2334	*
2335	* @head: Pointer to "struct tomoyo_io_buffer".
2336	*/
2337	static void tomoyo_read_query(struct tomoyo_io_buffer *head)
2338	__must_hold(&head->io_sem)
2339	{
2340	struct list_head *tmp;
2341	unsigned int pos = 0;
2342	size_t len = 0;
2343	char *buf;
2344
2345	if (head->r.w_pos)
2346	return;
2347	kfree(head->read_buf);
2348	head->read_buf = NULL;
2349	spin_lock(&tomoyo_query_list_lock);
2350	list_for_each(tmp, &tomoyo_query_list) {
2351	struct tomoyo_query ptr = list_entry(tmp, typeof(ptr), list);
2352
2353	if (pos++ != head->r.query_index)
2354	continue;
2355	len = ptr->query_len;
2356	break;
2357	}
2358	spin_unlock(&tomoyo_query_list_lock);
2359	if (!len) {
2360	head->r.query_index = 0;
2361	return;
2362	}
2363	buf = kzalloc(len + 32, GFP_NOFS);
2364	if (!buf)
2365	return;
2366	pos = 0;
2367	spin_lock(&tomoyo_query_list_lock);
2368	list_for_each(tmp, &tomoyo_query_list) {
2369	struct tomoyo_query ptr = list_entry(tmp, typeof(ptr), list);
2370
2371	if (pos++ != head->r.query_index)
2372	continue;
2373	/*
2374	* Some query can be skipped because tomoyo_query_list
2375	* can change, but I don't care.
2376	*/
2377	if (len == ptr->query_len)
2378	snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
2379	ptr->retry, ptr->query);
2380	break;
2381	}
2382	spin_unlock(&tomoyo_query_list_lock);
2383	if (buf[0]) {
2384	head->read_buf = buf;
2385	head->r.w[head->r.w_pos++] = buf;
2386	head->r.query_index++;
2387	} else {
2388	kfree(buf);
2389	}
2390	}
2391
2392	/**
2393	* tomoyo_write_answer - Write the supervisor's decision.
2394	*
2395	* @head: Pointer to "struct tomoyo_io_buffer".
2396	*
2397	* Returns 0 on success, -EINVAL otherwise.
2398	*/
2399	static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
2400	__must_hold(&head->io_sem)
2401	{
2402	char *data = head->write_buf;
2403	struct list_head *tmp;
2404	unsigned int serial;
2405	unsigned int answer;
2406
2407	spin_lock(&tomoyo_query_list_lock);
2408	list_for_each(tmp, &tomoyo_query_list) {
2409	struct tomoyo_query ptr = list_entry(tmp, typeof(ptr), list);
2410
2411	ptr->timer = 0;
2412	}
2413	spin_unlock(&tomoyo_query_list_lock);
2414	if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
2415	return -EINVAL;
2416	spin_lock(&tomoyo_query_list_lock);
2417	list_for_each(tmp, &tomoyo_query_list) {
2418	struct tomoyo_query ptr = list_entry(tmp, typeof(ptr), list);
2419
2420	if (ptr->serial != serial)
2421	continue;
2422	ptr->answer = answer;
2423	/* Remove from tomoyo_query_list. */
2424	if (ptr->answer)
2425	list_del_init(&ptr->list);
2426	break;
2427	}
2428	spin_unlock(&tomoyo_query_list_lock);
2429	return 0;
2430	}
2431
2432	/**
2433	* tomoyo_read_version: Get version.
2434	*
2435	* @head: Pointer to "struct tomoyo_io_buffer".
2436	*
2437	* Returns version information.
2438	*/
2439	static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2440	__must_hold(&head->io_sem)
2441	{
2442	if (!head->r.eof) {
2443	tomoyo_io_printf(head, "2.6.0");
2444	head->r.eof = true;
2445	}
2446	}
2447
2448	/* String table for /sys/kernel/security/tomoyo/stat interface. */
2449	static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2450	[TOMOYO_STAT_POLICY_UPDATES] = "update:",
2451	[TOMOYO_STAT_POLICY_LEARNING] = "violation in learning mode:",
2452	[TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2453	[TOMOYO_STAT_POLICY_ENFORCING] = "violation in enforcing mode:",
2454	};
2455
2456	/* String table for /sys/kernel/security/tomoyo/stat interface. */
2457	static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2458	[TOMOYO_MEMORY_POLICY] = "policy:",
2459	[TOMOYO_MEMORY_AUDIT] = "audit log:",
2460	[TOMOYO_MEMORY_QUERY] = "query message:",
2461	};
2462
2463	/* Counter for number of updates. */
2464	static atomic_t tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2465	/* Timestamp counter for last updated. */
2466	static time64_t tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2467
2468	/**
2469	* tomoyo_update_stat - Update statistic counters.
2470	*
2471	* @index: Index for policy type.
2472	*
2473	* Returns nothing.
2474	*/
2475	void tomoyo_update_stat(const u8 index)
2476	{
2477	atomic_inc(&tomoyo_stat_updated[index]);
2478	tomoyo_stat_modified[index] = ktime_get_real_seconds();
2479	}
2480
2481	/**
2482	* tomoyo_read_stat - Read statistic data.
2483	*
2484	* @head: Pointer to "struct tomoyo_io_buffer".
2485	*
2486	* Returns nothing.
2487	*/
2488	static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2489	__must_hold(&head->io_sem)
2490	{
2491	u8 i;
2492	unsigned int total = 0;
2493
2494	if (head->r.eof)
2495	return;
2496	for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2497	tomoyo_io_printf(head, "Policy %-30s %10u",
2498	tomoyo_policy_headers[i],
2499	atomic_read(&tomoyo_stat_updated[i]));
2500	if (tomoyo_stat_modified[i]) {
2501	struct tomoyo_time stamp;
2502
2503	tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2504	tomoyo_io_printf(head, " (Last: %04u/%02u/%02u %02u:%02u:%02u)",
2505	stamp.year, stamp.month, stamp.day,
2506	stamp.hour, stamp.min, stamp.sec);
2507	}
2508	tomoyo_set_lf(head);
2509	}
2510	for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2511	unsigned int used = tomoyo_memory_used[i];
2512
2513	total += used;
2514	tomoyo_io_printf(head, "Memory used by %-22s %10u",
2515	tomoyo_memory_headers[i], used);
2516	used = tomoyo_memory_quota[i];
2517	if (used)
2518	tomoyo_io_printf(head, " (Quota: %10u)", used);
2519	tomoyo_set_lf(head);
2520	}
2521	tomoyo_io_printf(head, "Total memory used: %10u\n",
2522	total);
2523	head->r.eof = true;
2524	}
2525
2526	/**
2527	* tomoyo_write_stat - Set memory quota.
2528	*
2529	* @head: Pointer to "struct tomoyo_io_buffer".
2530	*
2531	* Returns 0.
2532	*/
2533	static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2534	__must_hold(&head->io_sem)
2535	{
2536	char *data = head->write_buf;
2537	u8 i;
2538
2539	if (tomoyo_str_starts(&data, "Memory used by "))
2540	for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2541	if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2542	sscanf(data, "%u", &tomoyo_memory_quota[i]);
2543	return 0;
2544	}
2545
2546	/**
2547	* tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2548	*
2549	* @type: Type of interface.
2550	* @file: Pointer to "struct file".
2551	*
2552	* Returns 0 on success, negative value otherwise.
2553	*/
2554	int tomoyo_open_control(const u8 type, struct file *file)
2555	{
2556	struct tomoyo_io_buffer head = kzalloc_obj(head, GFP_NOFS);
2557
2558	if (!head)
2559	return -ENOMEM;
2560	guard(mutex_init)(&head->io_sem);
2561	head->type = type;
2562	switch (type) {
2563	case TOMOYO_DOMAINPOLICY:
2564	/* /sys/kernel/security/tomoyo/domain_policy */
2565	head->write = tomoyo_write_domain;
2566	head->read = tomoyo_read_domain;
2567	break;
2568	case TOMOYO_EXCEPTIONPOLICY:
2569	/* /sys/kernel/security/tomoyo/exception_policy */
2570	head->write = tomoyo_write_exception;
2571	head->read = tomoyo_read_exception;
2572	break;
2573	case TOMOYO_AUDIT:
2574	/* /sys/kernel/security/tomoyo/audit */
2575	head->poll = tomoyo_poll_log;
2576	head->read = tomoyo_read_log;
2577	break;
2578	case TOMOYO_PROCESS_STATUS:
2579	/* /sys/kernel/security/tomoyo/.process_status */
2580	head->write = tomoyo_write_pid;
2581	head->read = tomoyo_read_pid;
2582	break;
2583	case TOMOYO_VERSION:
2584	/* /sys/kernel/security/tomoyo/version */
2585	head->read = tomoyo_read_version;
2586	head->readbuf_size = 128;
2587	break;
2588	case TOMOYO_STAT:
2589	/* /sys/kernel/security/tomoyo/stat */
2590	head->write = tomoyo_write_stat;
2591	head->read = tomoyo_read_stat;
2592	head->readbuf_size = 1024;
2593	break;
2594	case TOMOYO_PROFILE:
2595	/* /sys/kernel/security/tomoyo/profile */
2596	head->write = tomoyo_write_profile;
2597	head->read = tomoyo_read_profile;
2598	break;
2599	case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2600	head->poll = tomoyo_poll_query;
2601	head->write = tomoyo_write_answer;
2602	head->read = tomoyo_read_query;
2603	break;
2604	case TOMOYO_MANAGER:
2605	/* /sys/kernel/security/tomoyo/manager */
2606	head->write = tomoyo_write_manager;
2607	head->read = tomoyo_read_manager;
2608	break;
2609	}
2610	if (!(file->f_mode & FMODE_READ)) {
2611	/*
2612	* No need to allocate read_buf since it is not opened
2613	* for reading.
2614	*/
2615	head->read = NULL;
2616	head->poll = NULL;
2617	} else if (!head->poll) {
2618	/* Don't allocate read_buf for poll() access. */
2619	if (!head->readbuf_size)
2620	head->readbuf_size = 4096 * 2;
2621	head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2622	if (!head->read_buf) {
2623	kfree(head);
2624	return -ENOMEM;
2625	}
2626	}
2627	if (!(file->f_mode & FMODE_WRITE)) {
2628	/*
2629	* No need to allocate write_buf since it is not opened
2630	* for writing.
2631	*/
2632	head->write = NULL;
2633	} else if (head->write) {
2634	head->writebuf_size = 4096 * 2;
2635	head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2636	if (!head->write_buf) {
2637	kfree(head->read_buf);
2638	kfree(head);
2639	return -ENOMEM;
2640	}
2641	}
2642	/*
2643	* If the file is /sys/kernel/security/tomoyo/query , increment the
2644	* observer counter.
2645	* The obserber counter is used by tomoyo_supervisor() to see if
2646	* there is some process monitoring /sys/kernel/security/tomoyo/query.
2647	*/
2648	if (type == TOMOYO_QUERY)
2649	atomic_inc(&tomoyo_query_observers);
2650	file->private_data = head;
2651	tomoyo_notify_gc(head, true);
2652	return 0;
2653	}
2654
2655	/**
2656	* tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2657	*
2658	* @file: Pointer to "struct file".
2659	* @wait: Pointer to "poll_table". Maybe NULL.
2660	*
2661	* Returns EPOLLIN \| EPOLLRDNORM \| EPOLLOUT \| EPOLLWRNORM if ready to read/write,
2662	* EPOLLOUT \| EPOLLWRNORM otherwise.
2663	*/
2664	__poll_t tomoyo_poll_control(struct file file, poll_table wait)
2665	{
2666	struct tomoyo_io_buffer *head = file->private_data;
2667
2668	if (head->poll)
2669	return head->poll(file, wait) \| EPOLLOUT \| EPOLLWRNORM;
2670	return EPOLLIN \| EPOLLRDNORM \| EPOLLOUT \| EPOLLWRNORM;
2671	}
2672
2673	/**
2674	* tomoyo_set_namespace_cursor - Set namespace to read.
2675	*
2676	* @head: Pointer to "struct tomoyo_io_buffer".
2677	*
2678	* Returns nothing.
2679	*/
2680	static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2681	{
2682	struct list_head *ns;
2683
2684	if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2685	head->type != TOMOYO_PROFILE)
2686	return;
2687	/*
2688	* If this is the first read, or reading previous namespace finished
2689	* and has more namespaces to read, update the namespace cursor.
2690	*/
2691	ns = head->r.ns;
2692	if (!ns \|\| (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2693	/* Clearing is OK because tomoyo_flush() returned true. */
2694	memset(&head->r, 0, sizeof(head->r));
2695	head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2696	}
2697	}
2698
2699	/**
2700	* tomoyo_has_more_namespace - Check for unread namespaces.
2701	*
2702	* @head: Pointer to "struct tomoyo_io_buffer".
2703	*
2704	* Returns true if we have more entries to print, false otherwise.
2705	*/
2706	static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2707	{
2708	return (head->type == TOMOYO_EXCEPTIONPOLICY \|\|
2709	head->type == TOMOYO_PROFILE) && head->r.eof &&
2710	head->r.ns->next != &tomoyo_namespace_list;
2711	}
2712
2713	/**
2714	* tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2715	*
2716	* @head: Pointer to "struct tomoyo_io_buffer".
2717	* @buffer: Pointer to buffer to write to.
2718	* @buffer_len: Size of @buffer.
2719	*
2720	* Returns bytes read on success, negative value otherwise.
2721	*/
2722	ssize_t tomoyo_read_control(struct tomoyo_io_buffer head, char __user buffer,
2723	const int buffer_len)
2724	{
2725	int len;
2726	int idx;
2727
2728	if (!head->read)
2729	return -EINVAL;
2730	if (mutex_lock_interruptible(&head->io_sem))
2731	return -EINTR;
2732	head->read_user_buf = buffer;
2733	head->read_user_buf_avail = buffer_len;
2734	idx = tomoyo_read_lock();
2735	if (tomoyo_flush(head))
2736	/* Call the policy handler. */
2737	do {
2738	tomoyo_set_namespace_cursor(head);
2739	head->read(head);
2740	} while (tomoyo_flush(head) &&
2741	tomoyo_has_more_namespace(head));
2742	tomoyo_read_unlock(idx);
2743	len = head->read_user_buf - buffer;
2744	mutex_unlock(&head->io_sem);
2745	return len;
2746	}
2747
2748	/**
2749	* tomoyo_parse_policy - Parse a policy line.
2750	*
2751	* @head: Pointer to "struct tomoyo_io_buffer".
2752	* @line: Line to parse.
2753	*
2754	* Returns 0 on success, negative value otherwise.
2755	*
2756	* Caller holds tomoyo_read_lock().
2757	*/
2758	static int tomoyo_parse_policy(struct tomoyo_io_buffer head, char line)
2759	__must_hold_shared(&tomoyo_ss)
2760	__must_hold(&head->io_sem)
2761	{
2762	/* Delete request? */
2763	head->w.is_delete = !strncmp(line, "delete ", 7);
2764	if (head->w.is_delete)
2765	memmove(line, line + 7, strlen(line + 7) + 1);
2766	/* Selecting namespace to update. */
2767	if (head->type == TOMOYO_EXCEPTIONPOLICY \|\|
2768	head->type == TOMOYO_PROFILE) {
2769	if (*line == '<') {
2770	char *cp = strchr(line, ' ');
2771
2772	if (cp) {
2773	*cp++ = '\0';
2774	head->w.ns = tomoyo_assign_namespace(line);
2775	memmove(line, cp, strlen(cp) + 1);
2776	} else
2777	head->w.ns = NULL;
2778	} else
2779	head->w.ns = &tomoyo_kernel_namespace;
2780	/* Don't allow updating if namespace is invalid. */
2781	if (!head->w.ns)
2782	return -ENOENT;
2783	}
2784	/* Do the update. */
2785	return head->write(head);
2786	}
2787
2788	/**
2789	* tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2790	*
2791	* @head: Pointer to "struct tomoyo_io_buffer".
2792	* @buffer: Pointer to buffer to read from.
2793	* @buffer_len: Size of @buffer.
2794	*
2795	* Returns @buffer_len on success, negative value otherwise.
2796	*/
2797	ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2798	const char __user *buffer, const int buffer_len)
2799	{
2800	int error = buffer_len;
2801	size_t avail_len = buffer_len;
2802	char *cp0;
2803	int idx;
2804
2805	if (!head->write)
2806	return -EINVAL;
2807	if (mutex_lock_interruptible(&head->io_sem))
2808	return -EINTR;
2809	cp0 = head->write_buf;
2810	head->read_user_buf_avail = 0;
2811	idx = tomoyo_read_lock();
2812	/* Read a line and dispatch it to the policy handler. */
2813	while (avail_len > 0) {
2814	char c;
2815
2816	if (head->w.avail >= head->writebuf_size - 1) {
2817	const int len = head->writebuf_size * 2;
2818	char *cp = kzalloc(len, GFP_NOFS \| __GFP_NOWARN);
2819
2820	if (!cp) {
2821	error = -ENOMEM;
2822	break;
2823	}
2824	memmove(cp, cp0, head->w.avail);
2825	kfree(cp0);
2826	head->write_buf = cp;
2827	cp0 = cp;
2828	head->writebuf_size = len;
2829	}
2830	if (get_user(c, buffer)) {
2831	error = -EFAULT;
2832	break;
2833	}
2834	buffer++;
2835	avail_len--;
2836	cp0[head->w.avail++] = c;
2837	if (c != '\n')
2838	continue;
2839	cp0[head->w.avail - 1] = '\0';
2840	head->w.avail = 0;
2841	tomoyo_normalize_line(cp0);
2842	if (!strcmp(cp0, "reset")) {
2843	head->w.ns = &tomoyo_kernel_namespace;
2844	head->w.domain = NULL;
2845	memset(&head->r, 0, sizeof(head->r));
2846	continue;
2847	}
2848	/* Don't allow updating policies by non manager programs. */
2849	switch (head->type) {
2850	case TOMOYO_PROCESS_STATUS:
2851	/* This does not write anything. */
2852	break;
2853	case TOMOYO_DOMAINPOLICY:
2854	if (tomoyo_select_domain(head, cp0))
2855	continue;
2856	fallthrough;
2857	case TOMOYO_EXCEPTIONPOLICY:
2858	if (!strcmp(cp0, "select transition_only")) {
2859	head->r.print_transition_related_only = true;
2860	continue;
2861	}
2862	fallthrough;
2863	default:
2864	if (!tomoyo_manager()) {
2865	error = -EPERM;
2866	goto out;
2867	}
2868	}
2869	switch (tomoyo_parse_policy(head, cp0)) {
2870	case -EPERM:
2871	error = -EPERM;
2872	goto out;
2873	case 0:
2874	switch (head->type) {
2875	case TOMOYO_DOMAINPOLICY:
2876	case TOMOYO_EXCEPTIONPOLICY:
2877	case TOMOYO_STAT:
2878	case TOMOYO_PROFILE:
2879	case TOMOYO_MANAGER:
2880	tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2881	break;
2882	default:
2883	break;
2884	}
2885	break;
2886	}
2887	}
2888	out:
2889	tomoyo_read_unlock(idx);
2890	mutex_unlock(&head->io_sem);
2891	return error;
2892	}
2893
2894	/**
2895	* tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2896	*
2897	* @head: Pointer to "struct tomoyo_io_buffer".
2898	*/
2899	void tomoyo_close_control(struct tomoyo_io_buffer *head)
2900	{
2901	/*
2902	* If the file is /sys/kernel/security/tomoyo/query , decrement the
2903	* observer counter.
2904	*/
2905	if (head->type == TOMOYO_QUERY &&
2906	atomic_dec_and_test(&tomoyo_query_observers))
2907	wake_up_all(&tomoyo_answer_wait);
2908	tomoyo_notify_gc(head, false);
2909	}
2910
2911	/**
2912	* tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2913	*/
2914	void tomoyo_check_profile(void)
2915	{
2916	struct tomoyo_domain_info *domain;
2917	const int idx = tomoyo_read_lock();
2918
2919	tomoyo_policy_loaded = true;
2920	pr_info("TOMOYO: 2.6.0\n");
2921	list_for_each_entry_rcu(domain, &tomoyo_domain_list, list,
2922	srcu_read_lock_held(&tomoyo_ss)) {
2923	const u8 profile = domain->profile;
2924	struct tomoyo_policy_namespace *ns = domain->ns;
2925
2926	if (ns->profile_version == 20110903) {
2927	pr_info_once("Converting profile version from %u to %u.\n",
2928	20110903, 20150505);
2929	ns->profile_version = 20150505;
2930	}
2931	if (ns->profile_version != 20150505)
2932	pr_err("Profile version %u is not supported.\n",
2933	ns->profile_version);
2934	else if (!ns->profile_ptr[profile])
2935	pr_err("Profile %u (used by '%s') is not defined.\n",
2936	profile, domain->domainname->name);
2937	else
2938	continue;
2939	pr_err("Userland tools for TOMOYO 2.6 must be installed and policy must be initialized.\n");
2940	pr_err("Please see https://tomoyo.sourceforge.net/2.6/ for more information.\n");
2941	panic("STOP!");
2942	}
2943	tomoyo_read_unlock(idx);
2944	pr_info("Mandatory Access Control activated.\n");
2945	}
2946
2947	/**
2948	* tomoyo_load_builtin_policy - Load built-in policy.
2949	*
2950	* Returns nothing.
2951	*/
2952	void __init tomoyo_load_builtin_policy(void)
2953	{
2954	#ifdef CONFIG_SECURITY_TOMOYO_INSECURE_BUILTIN_SETTING
2955	static char tomoyo_builtin_profile[] __initdata =
2956	"PROFILE_VERSION=20150505\n"
2957	"0-CONFIG={ mode=learning grant_log=no reject_log=yes }\n";
2958	static char tomoyo_builtin_exception_policy[] __initdata =
2959	"aggregator proc:/self/exe /proc/self/exe\n";
2960	static char tomoyo_builtin_domain_policy[] __initdata = "";
2961	static char tomoyo_builtin_manager[] __initdata = "";
2962	static char tomoyo_builtin_stat[] __initdata = "";
2963	#else
2964	/*
2965	* This include file is manually created and contains built-in policy
2966	* named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2967	* "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2968	* "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2969	*/
2970	#include "builtin-policy.h"
2971	#endif
2972	u8 i;
2973	const int idx = tomoyo_read_lock();
2974
2975	for (i = 0; i < 5; i++) {
2976	struct tomoyo_io_buffer head = { };
2977	char *start = "";
2978
2979	switch (i) {
2980	case 0:
2981	start = tomoyo_builtin_profile;
2982	head.type = TOMOYO_PROFILE;
2983	head.write = tomoyo_write_profile;
2984	break;
2985	case 1:
2986	start = tomoyo_builtin_exception_policy;
2987	head.type = TOMOYO_EXCEPTIONPOLICY;
2988	head.write = tomoyo_write_exception;
2989	break;
2990	case 2:
2991	start = tomoyo_builtin_domain_policy;
2992	head.type = TOMOYO_DOMAINPOLICY;
2993	head.write = tomoyo_write_domain;
2994	break;
2995	case 3:
2996	start = tomoyo_builtin_manager;
2997	head.type = TOMOYO_MANAGER;
2998	head.write = tomoyo_write_manager;
2999	break;
3000	case 4:
3001	start = tomoyo_builtin_stat;
3002	head.type = TOMOYO_STAT;
3003	head.write = tomoyo_write_stat;
3004	break;
3005	}
3006	while (1) {
3007	char *end = strchr(start, '\n');
3008
3009	if (!end)
3010	break;
3011	*end = '\0';
3012	tomoyo_normalize_line(start);
3013	/* head is stack-local and not shared. */
3014	context_unsafe(
3015	head.write_buf = start;
3016	tomoyo_parse_policy(&head, start);
3017	);
3018	start = end + 1;
3019	}
3020	}
3021	tomoyo_read_unlock(idx);
3022	#ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
3023	tomoyo_check_profile();
3024	#endif
3025	}