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