2 * security/tomoyo/path_group.c
4 * Copyright (C) 2005-2009 NTT DATA CORPORATION
7 #include <linux/slab.h>
9 /* The list for "struct tomoyo_path_group". */
10 LIST_HEAD(tomoyo_path_group_list
);
13 * tomoyo_get_group - Allocate memory for "struct tomoyo_path_group".
15 * @group_name: The name of pathname group.
17 * Returns pointer to "struct tomoyo_path_group" on success, NULL otherwise.
19 struct tomoyo_group
*tomoyo_get_path_group(const char *group_name
)
21 struct tomoyo_group
*entry
= NULL
;
22 struct tomoyo_group
*group
= NULL
;
23 const struct tomoyo_path_info
*saved_group_name
;
25 if (!tomoyo_correct_word(group_name
))
27 saved_group_name
= tomoyo_get_name(group_name
);
28 if (!saved_group_name
)
30 entry
= kzalloc(sizeof(*entry
), GFP_NOFS
);
31 if (mutex_lock_interruptible(&tomoyo_policy_lock
))
33 list_for_each_entry_rcu(group
, &tomoyo_path_group_list
, list
) {
34 if (saved_group_name
!= group
->group_name
)
36 atomic_inc(&group
->users
);
40 if (error
&& tomoyo_memory_ok(entry
)) {
41 INIT_LIST_HEAD(&entry
->member_list
);
42 entry
->group_name
= saved_group_name
;
43 saved_group_name
= NULL
;
44 atomic_set(&entry
->users
, 1);
45 list_add_tail_rcu(&entry
->list
, &tomoyo_path_group_list
);
50 mutex_unlock(&tomoyo_policy_lock
);
52 tomoyo_put_name(saved_group_name
);
54 return !error
? group
: NULL
;
57 static bool tomoyo_same_path_group(const struct tomoyo_acl_head
*a
,
58 const struct tomoyo_acl_head
*b
)
60 return container_of(a
, struct tomoyo_path_group
, head
)
62 container_of(b
, struct tomoyo_path_group
, head
)
67 * tomoyo_write_path_group_policy - Write "struct tomoyo_path_group" list.
69 * @data: String to parse.
70 * @is_delete: True if it is a delete request.
72 * Returns 0 on success, nagative value otherwise.
74 int tomoyo_write_path_group_policy(char *data
, const bool is_delete
)
76 struct tomoyo_group
*group
;
77 struct tomoyo_path_group e
= { };
78 int error
= is_delete
? -ENOENT
: -ENOMEM
;
80 if (!tomoyo_tokenize(data
, w
, sizeof(w
)) || !w
[1][0])
82 group
= tomoyo_get_path_group(w
[0]);
85 e
.member_name
= tomoyo_get_name(w
[1]);
88 error
= tomoyo_update_policy(&e
.head
, sizeof(e
), is_delete
,
90 tomoyo_same_path_group
);
92 tomoyo_put_name(e
.member_name
);
93 tomoyo_put_group(group
);
98 * tomoyo_read_path_group_policy - Read "struct tomoyo_path_group" list.
100 * @head: Pointer to "struct tomoyo_io_buffer".
102 * Returns true on success, false otherwise.
104 * Caller holds tomoyo_read_lock().
106 bool tomoyo_read_path_group_policy(struct tomoyo_io_buffer
*head
)
108 struct list_head
*gpos
;
109 struct list_head
*mpos
;
110 list_for_each_cookie(gpos
, head
->read_var1
, &tomoyo_path_group_list
) {
111 struct tomoyo_group
*group
;
112 group
= list_entry(gpos
, struct tomoyo_group
, list
);
113 list_for_each_cookie(mpos
, head
->read_var2
,
114 &group
->member_list
) {
115 struct tomoyo_path_group
*member
;
116 member
= list_entry(mpos
,
117 struct tomoyo_path_group
,
119 if (member
->head
.is_deleted
)
121 if (!tomoyo_io_printf(head
, TOMOYO_KEYWORD_PATH_GROUP
123 group
->group_name
->name
,
124 member
->member_name
->name
))
132 * tomoyo_path_matches_group - Check whether the given pathname matches members of the given pathname group.
134 * @pathname: The name of pathname.
135 * @group: Pointer to "struct tomoyo_path_group".
137 * Returns true if @pathname matches pathnames in @group, false otherwise.
139 * Caller holds tomoyo_read_lock().
141 bool tomoyo_path_matches_group(const struct tomoyo_path_info
*pathname
,
142 const struct tomoyo_group
*group
)
144 struct tomoyo_path_group
*member
;
145 bool matched
= false;
146 list_for_each_entry_rcu(member
, &group
->member_list
, head
.list
) {
147 if (member
->head
.is_deleted
)
149 if (!tomoyo_path_matches_pattern(pathname
,
150 member
->member_name
))