[mirror_ubuntu-artful-kernel.git] / security / tomoyo / mount.c

/*
 * security/tomoyo/mount.c
 *
 * Copyright (C) 2005-2010  NTT DATA CORPORATION
 */

#include <linux/slab.h>
#include "common.h"

/* Keywords for mount restrictions. */

/* Allow to call 'mount --bind /source_dir /dest_dir' */
#define TOMOYO_MOUNT_BIND_KEYWORD                        "--bind"
/* Allow to call 'mount --move /old_dir    /new_dir ' */
#define TOMOYO_MOUNT_MOVE_KEYWORD                        "--move"
/* Allow to call 'mount -o remount /dir             ' */
#define TOMOYO_MOUNT_REMOUNT_KEYWORD                     "--remount"
/* Allow to call 'mount --make-unbindable /dir'       */
#define TOMOYO_MOUNT_MAKE_UNBINDABLE_KEYWORD             "--make-unbindable"
/* Allow to call 'mount --make-private /dir'          */
#define TOMOYO_MOUNT_MAKE_PRIVATE_KEYWORD                "--make-private"
/* Allow to call 'mount --make-slave /dir'            */
#define TOMOYO_MOUNT_MAKE_SLAVE_KEYWORD                  "--make-slave"
/* Allow to call 'mount --make-shared /dir'           */
#define TOMOYO_MOUNT_MAKE_SHARED_KEYWORD                 "--make-shared"

/**
 * tomoyo_mount_acl2 - Check permission for mount() operation.
 *
 * @r:        Pointer to "struct tomoyo_request_info".
 * @dev_name: Name of device file.
 * @dir:      Pointer to "struct path".
 * @type:     Name of filesystem type.
 * @flags:    Mount options.
 *
 * Returns 0 on success, negative value otherwise.
 *
 * Caller holds tomoyo_read_lock().
 */
static int tomoyo_mount_acl2(struct tomoyo_request_info *r, char *dev_name,
			     struct path *dir, char *type, unsigned long flags)
{
	struct path path;
	struct tomoyo_acl_info *ptr;
	struct file_system_type *fstype = NULL;
	const char *requested_type = NULL;
	const char *requested_dir_name = NULL;
	const char *requested_dev_name = NULL;
	struct tomoyo_path_info rtype;
	struct tomoyo_path_info rdev;
	struct tomoyo_path_info rdir;
	int need_dev = 0;
	int error = -ENOMEM;

	/* Get fstype. */
	requested_type = tomoyo_encode(type);
	if (!requested_type)
		goto out;
	rtype.name = requested_type;
	tomoyo_fill_path_info(&rtype);

	/* Get mount point. */
	requested_dir_name = tomoyo_realpath_from_path(dir);
	if (!requested_dir_name) {
		error = -ENOMEM;
		goto out;
	}
	rdir.name = requested_dir_name;
	tomoyo_fill_path_info(&rdir);

	/* Compare fs name. */
	if (!strcmp(type, TOMOYO_MOUNT_REMOUNT_KEYWORD)) {
		/* dev_name is ignored. */
	} else if (!strcmp(type, TOMOYO_MOUNT_MAKE_UNBINDABLE_KEYWORD) ||
		   !strcmp(type, TOMOYO_MOUNT_MAKE_PRIVATE_KEYWORD) ||
		   !strcmp(type, TOMOYO_MOUNT_MAKE_SLAVE_KEYWORD) ||
		   !strcmp(type, TOMOYO_MOUNT_MAKE_SHARED_KEYWORD)) {
		/* dev_name is ignored. */
	} else if (!strcmp(type, TOMOYO_MOUNT_BIND_KEYWORD) ||
		   !strcmp(type, TOMOYO_MOUNT_MOVE_KEYWORD)) {
		need_dev = -1; /* dev_name is a directory */
	} else {
		fstype = get_fs_type(type);
		if (!fstype) {
			error = -ENODEV;
			goto out;
		}
		if (fstype->fs_flags & FS_REQUIRES_DEV)
			/* dev_name is a block device file. */
			need_dev = 1;
	}
	if (need_dev) {
		/* Get mount point or device file. */
		if (kern_path(dev_name, LOOKUP_FOLLOW, &path)) {
			error = -ENOENT;
			goto out;
		}
		requested_dev_name = tomoyo_realpath_from_path(&path);
		if (!requested_dev_name) {
			error = -ENOENT;
			goto out;
		}
	} else {
		/* Map dev_name to "<NULL>" if no dev_name given. */
		if (!dev_name)
			dev_name = "<NULL>";
		requested_dev_name = tomoyo_encode(dev_name);
		if (!requested_dev_name) {
			error = -ENOMEM;
			goto out;
		}
	}
	rdev.name = requested_dev_name;
	tomoyo_fill_path_info(&rdev);
	list_for_each_entry_rcu(ptr, &r->domain->acl_info_list, list) {
		struct tomoyo_mount_acl *acl;
		if (ptr->type != TOMOYO_TYPE_MOUNT_ACL)
			continue;
		acl = container_of(ptr, struct tomoyo_mount_acl, head);
		if (acl->is_deleted ||
		    !tomoyo_compare_number_union(flags, &acl->flags) ||
		    !tomoyo_compare_name_union(&rtype, &acl->fs_type) ||
		    !tomoyo_compare_name_union(&rdir, &acl->dir_name) ||
		    (need_dev &&
		     !tomoyo_compare_name_union(&rdev, &acl->dev_name)))
			continue;
		error = 0;
		break;
	}
	if (error)
		error = tomoyo_supervisor(r, TOMOYO_KEYWORD_ALLOW_MOUNT
					  "%s %s %s 0x%lX\n",
					  tomoyo_file_pattern(&rdev),
					  tomoyo_file_pattern(&rdir),
					  requested_type, flags);
 out:
	kfree(requested_dev_name);
	kfree(requested_dir_name);
	if (fstype)
		put_filesystem(fstype);
	kfree(requested_type);
	return error;
}

/**
 * tomoyo_mount_acl - Check permission for mount() operation.
 *
 * @r:        Pointer to "struct tomoyo_request_info".
 * @dev_name: Name of device file.
 * @dir:      Pointer to "struct path".
 * @type:     Name of filesystem type.
 * @flags:    Mount options.
 *
 * Returns 0 on success, negative value otherwise.
 *
 * Caller holds tomoyo_read_lock().
 */
static int tomoyo_mount_acl(struct tomoyo_request_info *r, char *dev_name,
			    struct path *dir, char *type, unsigned long flags)
{
	int error;
	error = -EPERM;
	if ((flags & MS_MGC_MSK) == MS_MGC_VAL)
		flags &= ~MS_MGC_MSK;
	switch (flags & (MS_REMOUNT | MS_MOVE | MS_BIND)) {
	case MS_REMOUNT:
	case MS_MOVE:
	case MS_BIND:
	case 0:
		break;
	default:
		printk(KERN_WARNING "ERROR: "
		       "%s%s%sare given for single mount operation.\n",
		       flags & MS_REMOUNT ? "'remount' " : "",
		       flags & MS_MOVE    ? "'move' " : "",
		       flags & MS_BIND    ? "'bind' " : "");
		return -EINVAL;
	}
	switch (flags & (MS_UNBINDABLE | MS_PRIVATE | MS_SLAVE | MS_SHARED)) {
	case MS_UNBINDABLE:
	case MS_PRIVATE:
	case MS_SLAVE:
	case MS_SHARED:
	case 0:
		break;
	default:
		printk(KERN_WARNING "ERROR: "
		       "%s%s%s%sare given for single mount operation.\n",
		       flags & MS_UNBINDABLE ? "'unbindable' " : "",
		       flags & MS_PRIVATE    ? "'private' " : "",
		       flags & MS_SLAVE      ? "'slave' " : "",
		       flags & MS_SHARED     ? "'shared' " : "");
		return -EINVAL;
	}
	if (flags & MS_REMOUNT)
		error = tomoyo_mount_acl(r, dev_name, dir,
				      TOMOYO_MOUNT_REMOUNT_KEYWORD,
				      flags & ~MS_REMOUNT);
	else if (flags & MS_MOVE)
		error = tomoyo_mount_acl(r, dev_name, dir,
				      TOMOYO_MOUNT_MOVE_KEYWORD,
				      flags & ~MS_MOVE);
	else if (flags & MS_BIND)
		error = tomoyo_mount_acl(r, dev_name, dir,
				      TOMOYO_MOUNT_BIND_KEYWORD,
				      flags & ~MS_BIND);
	else if (flags & MS_UNBINDABLE)
		error = tomoyo_mount_acl(r, dev_name, dir,
				      TOMOYO_MOUNT_MAKE_UNBINDABLE_KEYWORD,
				      flags & ~MS_UNBINDABLE);
	else if (flags & MS_PRIVATE)
		error = tomoyo_mount_acl(r, dev_name, dir,
				      TOMOYO_MOUNT_MAKE_PRIVATE_KEYWORD,
				      flags & ~MS_PRIVATE);
	else if (flags & MS_SLAVE)
		error = tomoyo_mount_acl(r, dev_name, dir,
				      TOMOYO_MOUNT_MAKE_SLAVE_KEYWORD,
				      flags & ~MS_SLAVE);
	else if (flags & MS_SHARED)
		error = tomoyo_mount_acl(r, dev_name, dir,
				      TOMOYO_MOUNT_MAKE_SHARED_KEYWORD,
				      flags & ~MS_SHARED);
	else
		do {
			error = tomoyo_mount_acl2(r, dev_name, dir, type,
						  flags);
		} while (error == TOMOYO_RETRY_REQUEST);
	if (r->mode != TOMOYO_CONFIG_ENFORCING)
		error = 0;
	return error;
}

/**
 * tomoyo_mount_permission - Check permission for mount() operation.
 *
 * @dev_name:  Name of device file.
 * @path:      Pointer to "struct path".
 * @type:      Name of filesystem type. May be NULL.
 * @flags:     Mount options.
 * @data_page: Optional data. May be NULL.
 *
 * Returns 0 on success, negative value otherwise.
 */
int tomoyo_mount_permission(char *dev_name, struct path *path, char *type,
			    unsigned long flags, void *data_page)
{
	struct tomoyo_request_info r;
	int error;
	int idx;

	if (tomoyo_init_request_info(&r, NULL) == TOMOYO_CONFIG_DISABLED)
		return 0;
	if (!type)
		type = "<NULL>";
	idx = tomoyo_read_lock();
	error = tomoyo_mount_acl(&r, dev_name, path, type, flags);
	tomoyo_read_unlock(idx);
	return error;
}

/**
 * tomoyo_write_mount_policy - Write "struct tomoyo_mount_acl" list.
 *
 * @data:      String to parse.
 * @domain:    Pointer to "struct tomoyo_domain_info".
 * @is_delete: True if it is a delete request.
 *
 * Returns 0 on success, negative value otherwise.
 */
int tomoyo_write_mount_policy(char *data, struct tomoyo_domain_info *domain,
			      const bool is_delete)
{
	struct tomoyo_acl_info *ptr;
	struct tomoyo_mount_acl e = { .head.type = TOMOYO_TYPE_MOUNT_ACL };
	int error = is_delete ? -ENOENT : -ENOMEM;
	char *w[4];
	if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[3][0])
		return -EINVAL;
	if (!tomoyo_parse_name_union(w[0], &e.dev_name) ||
	    !tomoyo_parse_name_union(w[1], &e.dir_name) ||
	    !tomoyo_parse_name_union(w[2], &e.fs_type) ||
	    !tomoyo_parse_number_union(w[3], &e.flags))
		goto out;
	if (mutex_lock_interruptible(&tomoyo_policy_lock))
		goto out;
	list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
		struct tomoyo_mount_acl *acl =
			container_of(ptr, struct tomoyo_mount_acl, head);
		if (!tomoyo_is_same_mount_acl(acl, &e))
			continue;
		acl->is_deleted = is_delete;
		error = 0;
		break;
	}
	if (!is_delete && error) {
		struct tomoyo_mount_acl *entry =
			tomoyo_commit_ok(&e, sizeof(e));
		if (entry) {
			list_add_tail_rcu(&entry->head.list,
					  &domain->acl_info_list);
			error = 0;
		}
	}
	mutex_unlock(&tomoyo_policy_lock);
 out:
	tomoyo_put_name_union(&e.dev_name);
	tomoyo_put_name_union(&e.dir_name);
	tomoyo_put_name_union(&e.fs_type);
	tomoyo_put_number_union(&e.flags);
	return error;
}
Commit	Line	Data
2106ccd9 TH	1	/*
	2	* security/tomoyo/mount.c
	3	*
	4	* Copyright (C) 2005-2010 NTT DATA CORPORATION
	5	*/
	6
	7	#include <linux/slab.h>
	8	#include "common.h"
	9
	10	/* Keywords for mount restrictions. */
	11
	12	/* Allow to call 'mount --bind /source_dir /dest_dir' */
	13	#define TOMOYO_MOUNT_BIND_KEYWORD "--bind"
	14	/* Allow to call 'mount --move /old_dir /new_dir ' */
	15	#define TOMOYO_MOUNT_MOVE_KEYWORD "--move"
	16	/* Allow to call 'mount -o remount /dir ' */
	17	#define TOMOYO_MOUNT_REMOUNT_KEYWORD "--remount"
	18	/* Allow to call 'mount --make-unbindable /dir' */
	19	#define TOMOYO_MOUNT_MAKE_UNBINDABLE_KEYWORD "--make-unbindable"
	20	/* Allow to call 'mount --make-private /dir' */
	21	#define TOMOYO_MOUNT_MAKE_PRIVATE_KEYWORD "--make-private"
	22	/* Allow to call 'mount --make-slave /dir' */
	23	#define TOMOYO_MOUNT_MAKE_SLAVE_KEYWORD "--make-slave"
	24	/* Allow to call 'mount --make-shared /dir' */
	25	#define TOMOYO_MOUNT_MAKE_SHARED_KEYWORD "--make-shared"
	26
2106ccd9 TH	27	/**
	28	* tomoyo_mount_acl2 - Check permission for mount() operation.
	29	*
	30	* @r: Pointer to "struct tomoyo_request_info".
	31	* @dev_name: Name of device file.
	32	* @dir: Pointer to "struct path".
	33	* @type: Name of filesystem type.
	34	* @flags: Mount options.
	35	*
	36	* Returns 0 on success, negative value otherwise.
	37	*
	38	* Caller holds tomoyo_read_lock().
	39	*/
	40	static int tomoyo_mount_acl2(struct tomoyo_request_info r, char dev_name,
	41	struct path dir, char type, unsigned long flags)
	42	{
	43	struct path path;
	44	struct tomoyo_acl_info *ptr;
	45	struct file_system_type *fstype = NULL;
	46	const char *requested_type = NULL;
	47	const char *requested_dir_name = NULL;
	48	const char *requested_dev_name = NULL;
	49	struct tomoyo_path_info rtype;
	50	struct tomoyo_path_info rdev;
	51	struct tomoyo_path_info rdir;
	52	int need_dev = 0;
	53	int error = -ENOMEM;
	54
	55	/* Get fstype. */
c8c57e84	56	requested_type = tomoyo_encode(type);
2106ccd9 TH	57	if (!requested_type)
	58	goto out;
	59	rtype.name = requested_type;
	60	tomoyo_fill_path_info(&rtype);
	61
	62	/* Get mount point. */
	63	requested_dir_name = tomoyo_realpath_from_path(dir);
	64	if (!requested_dir_name) {
	65	error = -ENOMEM;
	66	goto out;
	67	}
	68	rdir.name = requested_dir_name;
	69	tomoyo_fill_path_info(&rdir);
	70
	71	/* Compare fs name. */
	72	if (!strcmp(type, TOMOYO_MOUNT_REMOUNT_KEYWORD)) {
	73	/* dev_name is ignored. */
	74	} else if (!strcmp(type, TOMOYO_MOUNT_MAKE_UNBINDABLE_KEYWORD) \|\|
	75	!strcmp(type, TOMOYO_MOUNT_MAKE_PRIVATE_KEYWORD) \|\|
	76	!strcmp(type, TOMOYO_MOUNT_MAKE_SLAVE_KEYWORD) \|\|
	77	!strcmp(type, TOMOYO_MOUNT_MAKE_SHARED_KEYWORD)) {
	78	/* dev_name is ignored. */
	79	} else if (!strcmp(type, TOMOYO_MOUNT_BIND_KEYWORD) \|\|
	80	!strcmp(type, TOMOYO_MOUNT_MOVE_KEYWORD)) {
	81	need_dev = -1; /* dev_name is a directory */
	82	} else {
	83	fstype = get_fs_type(type);
	84	if (!fstype) {
	85	error = -ENODEV;
	86	goto out;
	87	}
	88	if (fstype->fs_flags & FS_REQUIRES_DEV)
	89	/* dev_name is a block device file. */
	90	need_dev = 1;
	91	}
	92	if (need_dev) {
	93	/* Get mount point or device file. */
	94	if (kern_path(dev_name, LOOKUP_FOLLOW, &path)) {
	95	error = -ENOENT;
	96	goto out;
	97	}
	98	requested_dev_name = tomoyo_realpath_from_path(&path);
	99	if (!requested_dev_name) {
	100	error = -ENOENT;
	101	goto out;
	102	}
	103	} else {
	104	/* Map dev_name to "<NULL>" if no dev_name given. */
	105	if (!dev_name)
	106	dev_name = "<NULL>";
c8c57e84	107	requested_dev_name = tomoyo_encode(dev_name);
2106ccd9 TH	108	if (!requested_dev_name) {
	109	error = -ENOMEM;
	110	goto out;
	111	}
	112	}
	113	rdev.name = requested_dev_name;
	114	tomoyo_fill_path_info(&rdev);
	115	list_for_each_entry_rcu(ptr, &r->domain->acl_info_list, list) {
	116	struct tomoyo_mount_acl *acl;
	117	if (ptr->type != TOMOYO_TYPE_MOUNT_ACL)
	118	continue;
	119	acl = container_of(ptr, struct tomoyo_mount_acl, head);
	120	if (acl->is_deleted \|\|
	121	!tomoyo_compare_number_union(flags, &acl->flags) \|\|
	122	!tomoyo_compare_name_union(&rtype, &acl->fs_type) \|\|
	123	!tomoyo_compare_name_union(&rdir, &acl->dir_name) \|\|
	124	(need_dev &&
	125	!tomoyo_compare_name_union(&rdev, &acl->dev_name)))
	126	continue;
	127	error = 0;
	128	break;
	129	}
17fcfbd9 TH	130	if (error)
	131	error = tomoyo_supervisor(r, TOMOYO_KEYWORD_ALLOW_MOUNT
	132	"%s %s %s 0x%lX\n",
	133	tomoyo_file_pattern(&rdev),
	134	tomoyo_file_pattern(&rdir),
	135	requested_type, flags);
2106ccd9 TH	136	out:
	137	kfree(requested_dev_name);
	138	kfree(requested_dir_name);
	139	if (fstype)
	140	put_filesystem(fstype);
	141	kfree(requested_type);
	142	return error;
	143	}
	144
	145	/**
	146	* tomoyo_mount_acl - Check permission for mount() operation.
	147	*
	148	* @r: Pointer to "struct tomoyo_request_info".
	149	* @dev_name: Name of device file.
	150	* @dir: Pointer to "struct path".
	151	* @type: Name of filesystem type.
	152	* @flags: Mount options.
	153	*
	154	* Returns 0 on success, negative value otherwise.
	155	*
	156	* Caller holds tomoyo_read_lock().
	157	*/
	158	static int tomoyo_mount_acl(struct tomoyo_request_info r, char dev_name,
	159	struct path dir, char type, unsigned long flags)
	160	{
	161	int error;
	162	error = -EPERM;
	163	if ((flags & MS_MGC_MSK) == MS_MGC_VAL)
	164	flags &= ~MS_MGC_MSK;
	165	switch (flags & (MS_REMOUNT \| MS_MOVE \| MS_BIND)) {
	166	case MS_REMOUNT:
	167	case MS_MOVE:
	168	case MS_BIND:
	169	case 0:
	170	break;
	171	default:
	172	printk(KERN_WARNING "ERROR: "
	173	"%s%s%sare given for single mount operation.\n",
	174	flags & MS_REMOUNT ? "'remount' " : "",
	175	flags & MS_MOVE ? "'move' " : "",
	176	flags & MS_BIND ? "'bind' " : "");
	177	return -EINVAL;
	178	}
	179	switch (flags & (MS_UNBINDABLE \| MS_PRIVATE \| MS_SLAVE \| MS_SHARED)) {
	180	case MS_UNBINDABLE:
	181	case MS_PRIVATE:
	182	case MS_SLAVE:
	183	case MS_SHARED:
	184	case 0:
	185	break;
	186	default:
	187	printk(KERN_WARNING "ERROR: "
	188	"%s%s%s%sare given for single mount operation.\n",
	189	flags & MS_UNBINDABLE ? "'unbindable' " : "",
	190	flags & MS_PRIVATE ? "'private' " : "",
	191	flags & MS_SLAVE ? "'slave' " : "",
	192	flags & MS_SHARED ? "'shared' " : "");
	193	return -EINVAL;
	194	}
	195	if (flags & MS_REMOUNT)
	196	error = tomoyo_mount_acl(r, dev_name, dir,
	197	TOMOYO_MOUNT_REMOUNT_KEYWORD,
	198	flags & ~MS_REMOUNT);
	199	else if (flags & MS_MOVE)
200	error = tomoyo_mount_acl(r, dev_name, dir,
201	TOMOYO_MOUNT_MOVE_KEYWORD,
202	flags & ~MS_MOVE);
203	else if (flags & MS_BIND)
204	error = tomoyo_mount_acl(r, dev_name, dir,
205	TOMOYO_MOUNT_BIND_KEYWORD,
206	flags & ~MS_BIND);
207	else if (flags & MS_UNBINDABLE)
208	error = tomoyo_mount_acl(r, dev_name, dir,
209	TOMOYO_MOUNT_MAKE_UNBINDABLE_KEYWORD,
210	flags & ~MS_UNBINDABLE);
211	else if (flags & MS_PRIVATE)
212	error = tomoyo_mount_acl(r, dev_name, dir,
213	TOMOYO_MOUNT_MAKE_PRIVATE_KEYWORD,
214	flags & ~MS_PRIVATE);
215	else if (flags & MS_SLAVE)
216	error = tomoyo_mount_acl(r, dev_name, dir,
217	TOMOYO_MOUNT_MAKE_SLAVE_KEYWORD,
218	flags & ~MS_SLAVE);
219	else if (flags & MS_SHARED)
220	error = tomoyo_mount_acl(r, dev_name, dir,
221	TOMOYO_MOUNT_MAKE_SHARED_KEYWORD,
222	flags & ~MS_SHARED);
223	else
17fcfbd9 TH	224	do {
	225	error = tomoyo_mount_acl2(r, dev_name, dir, type,
	226	flags);
	227	} while (error == TOMOYO_RETRY_REQUEST);
2106ccd9 TH	228	if (r->mode != TOMOYO_CONFIG_ENFORCING)
	229	error = 0;
	230	return error;
	231	}
	232
	233	/**
	234	* tomoyo_mount_permission - Check permission for mount() operation.
	235	*
	236	* @dev_name: Name of device file.
	237	* @path: Pointer to "struct path".
	238	* @type: Name of filesystem type. May be NULL.
	239	* @flags: Mount options.
	240	* @data_page: Optional data. May be NULL.
	241	*
	242	* Returns 0 on success, negative value otherwise.
	243	*/
	244	int tomoyo_mount_permission(char dev_name, struct path path, char *type,
	245	unsigned long flags, void *data_page)
	246	{
	247	struct tomoyo_request_info r;
	248	int error;
	249	int idx;
	250
	251	if (tomoyo_init_request_info(&r, NULL) == TOMOYO_CONFIG_DISABLED)
	252	return 0;
	253	if (!type)
	254	type = "<NULL>";
	255	idx = tomoyo_read_lock();
	256	error = tomoyo_mount_acl(&r, dev_name, path, type, flags);
	257	tomoyo_read_unlock(idx);
	258	return error;
	259	}
	260
	261	/**
	262	* tomoyo_write_mount_policy - Write "struct tomoyo_mount_acl" list.
	263	*
	264	* @data: String to parse.
	265	* @domain: Pointer to "struct tomoyo_domain_info".
	266	* @is_delete: True if it is a delete request.
	267	*
	268	* Returns 0 on success, negative value otherwise.
	269	*/
	270	int tomoyo_write_mount_policy(char data, struct tomoyo_domain_info domain,
	271	const bool is_delete)
	272	{
	273	struct tomoyo_acl_info *ptr;
	274	struct tomoyo_mount_acl e = { .head.type = TOMOYO_TYPE_MOUNT_ACL };
	275	int error = is_delete ? -ENOENT : -ENOMEM;
	276	char *w[4];
	277	if (!tomoyo_tokenize(data, w, sizeof(w)) \|\| !w[3][0])
	278	return -EINVAL;
	279	if (!tomoyo_parse_name_union(w[0], &e.dev_name) \|\|
	280	!tomoyo_parse_name_union(w[1], &e.dir_name) \|\|
	281	!tomoyo_parse_name_union(w[2], &e.fs_type) \|\|
	282	!tomoyo_parse_number_union(w[3], &e.flags))
	283	goto out;
	284	if (mutex_lock_interruptible(&tomoyo_policy_lock))
	285	goto out;
	286	list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
	287	struct tomoyo_mount_acl *acl =
	288	container_of(ptr, struct tomoyo_mount_acl, head);
	289	if (!tomoyo_is_same_mount_acl(acl, &e))
	290	continue;
	291	acl->is_deleted = is_delete;
292	error = 0;
293	break;
294	}
295	if (!is_delete && error) {
296	struct tomoyo_mount_acl *entry =
297	tomoyo_commit_ok(&e, sizeof(e));
298	if (entry) {
299	list_add_tail_rcu(&entry->head.list,
300	&domain->acl_info_list);
301	error = 0;
302	}
303	}
304	mutex_unlock(&tomoyo_policy_lock);
305	out:
306	tomoyo_put_name_union(&e.dev_name);
307	tomoyo_put_name_union(&e.dir_name);
308	tomoyo_put_name_union(&e.fs_type);
309	tomoyo_put_number_union(&e.flags);
310	return error;
311	}