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Commit | Line | Data |
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4c3e9e2d TH |
1 | /* |
2 | * security/tomoyo/number_group.c | |
3 | * | |
4 | * Copyright (C) 2005-2009 NTT DATA CORPORATION | |
5 | */ | |
6 | ||
7 | #include <linux/slab.h> | |
8 | #include "common.h" | |
9 | ||
10 | /* The list for "struct tomoyo_number_group". */ | |
11 | LIST_HEAD(tomoyo_number_group_list); | |
12 | ||
13 | /** | |
14 | * tomoyo_get_number_group - Allocate memory for "struct tomoyo_number_group". | |
15 | * | |
16 | * @group_name: The name of number group. | |
17 | * | |
18 | * Returns pointer to "struct tomoyo_number_group" on success, | |
19 | * NULL otherwise. | |
20 | */ | |
21 | struct tomoyo_number_group *tomoyo_get_number_group(const char *group_name) | |
22 | { | |
23 | struct tomoyo_number_group *entry = NULL; | |
24 | struct tomoyo_number_group *group = NULL; | |
25 | const struct tomoyo_path_info *saved_group_name; | |
26 | int error = -ENOMEM; | |
3f629636 | 27 | if (!tomoyo_is_correct_word(group_name)) |
4c3e9e2d TH |
28 | return NULL; |
29 | saved_group_name = tomoyo_get_name(group_name); | |
30 | if (!saved_group_name) | |
31 | return NULL; | |
32 | entry = kzalloc(sizeof(*entry), GFP_NOFS); | |
33 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) | |
34 | goto out; | |
35 | list_for_each_entry_rcu(group, &tomoyo_number_group_list, list) { | |
36 | if (saved_group_name != group->group_name) | |
37 | continue; | |
38 | atomic_inc(&group->users); | |
39 | error = 0; | |
40 | break; | |
41 | } | |
42 | if (error && tomoyo_memory_ok(entry)) { | |
43 | INIT_LIST_HEAD(&entry->member_list); | |
44 | entry->group_name = saved_group_name; | |
45 | saved_group_name = NULL; | |
46 | atomic_set(&entry->users, 1); | |
47 | list_add_tail_rcu(&entry->list, &tomoyo_number_group_list); | |
48 | group = entry; | |
49 | entry = NULL; | |
50 | error = 0; | |
51 | } | |
52 | mutex_unlock(&tomoyo_policy_lock); | |
53 | out: | |
54 | tomoyo_put_name(saved_group_name); | |
55 | kfree(entry); | |
56 | return !error ? group : NULL; | |
57 | } | |
58 | ||
36f5e1ff TH |
59 | static bool tomoyo_same_number_group(const struct tomoyo_acl_head *a, |
60 | const struct tomoyo_acl_head *b) | |
61 | { | |
62 | return !memcmp(&container_of(a, struct tomoyo_number_group_member, | |
63 | head)->number, | |
64 | &container_of(b, struct tomoyo_number_group_member, | |
65 | head)->number, | |
66 | sizeof(container_of(a, | |
67 | struct tomoyo_number_group_member, | |
68 | head)->number)); | |
69 | } | |
70 | ||
4c3e9e2d TH |
71 | /** |
72 | * tomoyo_write_number_group_policy - Write "struct tomoyo_number_group" list. | |
73 | * | |
74 | * @data: String to parse. | |
75 | * @is_delete: True if it is a delete request. | |
76 | * | |
77 | * Returns 0 on success, nagative value otherwise. | |
78 | */ | |
79 | int tomoyo_write_number_group_policy(char *data, const bool is_delete) | |
80 | { | |
81 | struct tomoyo_number_group *group; | |
82 | struct tomoyo_number_group_member e = { }; | |
36f5e1ff | 83 | int error; |
4c3e9e2d TH |
84 | char *w[2]; |
85 | if (!tomoyo_tokenize(data, w, sizeof(w))) | |
86 | return -EINVAL; | |
36f5e1ff TH |
87 | if (w[1][0] == '@' || !tomoyo_parse_number_union(w[1], &e.number) || |
88 | e.number.values[0] > e.number.values[1]) | |
4c3e9e2d | 89 | return -EINVAL; |
4c3e9e2d TH |
90 | group = tomoyo_get_number_group(w[0]); |
91 | if (!group) | |
92 | return -ENOMEM; | |
36f5e1ff TH |
93 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, |
94 | &group->member_list, | |
95 | tomoyo_same_number_group); | |
4c3e9e2d TH |
96 | tomoyo_put_number_group(group); |
97 | return error; | |
98 | } | |
99 | ||
100 | /** | |
101 | * tomoyo_read_number_group_policy - Read "struct tomoyo_number_group" list. | |
102 | * | |
103 | * @head: Pointer to "struct tomoyo_io_buffer". | |
104 | * | |
105 | * Returns true on success, false otherwise. | |
106 | * | |
107 | * Caller holds tomoyo_read_lock(). | |
108 | */ | |
109 | bool tomoyo_read_number_group_policy(struct tomoyo_io_buffer *head) | |
110 | { | |
111 | struct list_head *gpos; | |
112 | struct list_head *mpos; | |
113 | list_for_each_cookie(gpos, head->read_var1, &tomoyo_number_group_list) { | |
114 | struct tomoyo_number_group *group; | |
115 | const char *name; | |
116 | group = list_entry(gpos, struct tomoyo_number_group, list); | |
117 | name = group->group_name->name; | |
118 | list_for_each_cookie(mpos, head->read_var2, | |
119 | &group->member_list) { | |
120 | int pos; | |
121 | const struct tomoyo_number_group_member *member | |
122 | = list_entry(mpos, | |
123 | struct tomoyo_number_group_member, | |
82e0f001 TH |
124 | head.list); |
125 | if (member->head.is_deleted) | |
4c3e9e2d TH |
126 | continue; |
127 | pos = head->read_avail; | |
128 | if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_NUMBER_GROUP | |
129 | "%s", name) || | |
130 | !tomoyo_print_number_union(head, &member->number) || | |
131 | !tomoyo_io_printf(head, "\n")) { | |
132 | head->read_avail = pos; | |
133 | return false; | |
134 | } | |
135 | } | |
136 | } | |
137 | return true; | |
138 | } | |
139 | ||
140 | /** | |
141 | * tomoyo_number_matches_group - Check whether the given number matches members of the given number group. | |
142 | * | |
143 | * @min: Min number. | |
144 | * @max: Max number. | |
145 | * @group: Pointer to "struct tomoyo_number_group". | |
146 | * | |
147 | * Returns true if @min and @max partially overlaps @group, false otherwise. | |
148 | * | |
149 | * Caller holds tomoyo_read_lock(). | |
150 | */ | |
151 | bool tomoyo_number_matches_group(const unsigned long min, | |
152 | const unsigned long max, | |
153 | const struct tomoyo_number_group *group) | |
154 | { | |
155 | struct tomoyo_number_group_member *member; | |
156 | bool matched = false; | |
82e0f001 TH |
157 | list_for_each_entry_rcu(member, &group->member_list, head.list) { |
158 | if (member->head.is_deleted) | |
4c3e9e2d TH |
159 | continue; |
160 | if (min > member->number.values[1] || | |
161 | max < member->number.values[0]) | |
162 | continue; | |
163 | matched = true; | |
164 | break; | |
165 | } | |
166 | return matched; | |
167 | } |