Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
c3ef1500 TH |
2 | /* |
3 | * security/tomoyo/memory.c | |
4 | * | |
0f2a55d5 | 5 | * Copyright (C) 2005-2011 NTT DATA CORPORATION |
c3ef1500 TH |
6 | */ |
7 | ||
8 | #include <linux/hash.h> | |
9 | #include <linux/slab.h> | |
10 | #include "common.h" | |
11 | ||
12 | /** | |
13 | * tomoyo_warn_oom - Print out of memory warning message. | |
14 | * | |
15 | * @function: Function's name. | |
16 | */ | |
17 | void tomoyo_warn_oom(const char *function) | |
18 | { | |
19 | /* Reduce error messages. */ | |
20 | static pid_t tomoyo_last_pid; | |
21 | const pid_t pid = current->pid; | |
cdcf6723 | 22 | |
c3ef1500 | 23 | if (tomoyo_last_pid != pid) { |
cdcf6723 | 24 | pr_warn("ERROR: Out of memory at %s.\n", function); |
c3ef1500 TH |
25 | tomoyo_last_pid = pid; |
26 | } | |
27 | if (!tomoyo_policy_loaded) | |
28 | panic("MAC Initialization failed.\n"); | |
29 | } | |
30 | ||
eadd99cc TH |
31 | /* Memoy currently used by policy/audit log/query. */ |
32 | unsigned int tomoyo_memory_used[TOMOYO_MAX_MEMORY_STAT]; | |
33 | /* Memory quota for "policy"/"audit log"/"query". */ | |
34 | unsigned int tomoyo_memory_quota[TOMOYO_MAX_MEMORY_STAT]; | |
35 | ||
c3ef1500 TH |
36 | /** |
37 | * tomoyo_memory_ok - Check memory quota. | |
38 | * | |
39 | * @ptr: Pointer to allocated memory. | |
40 | * | |
41 | * Returns true on success, false otherwise. | |
42 | * | |
43 | * Returns true if @ptr is not NULL and quota not exceeded, false otherwise. | |
a427fd14 TH |
44 | * |
45 | * Caller holds tomoyo_policy_lock mutex. | |
c3ef1500 TH |
46 | */ |
47 | bool tomoyo_memory_ok(void *ptr) | |
48 | { | |
b22b8b9f TH |
49 | if (ptr) { |
50 | const size_t s = ksize(ptr); | |
cdcf6723 | 51 | |
b22b8b9f | 52 | tomoyo_memory_used[TOMOYO_MEMORY_POLICY] += s; |
a427fd14 TH |
53 | if (!tomoyo_memory_quota[TOMOYO_MEMORY_POLICY] || |
54 | tomoyo_memory_used[TOMOYO_MEMORY_POLICY] <= | |
55 | tomoyo_memory_quota[TOMOYO_MEMORY_POLICY]) | |
b22b8b9f | 56 | return true; |
a427fd14 | 57 | tomoyo_memory_used[TOMOYO_MEMORY_POLICY] -= s; |
c3ef1500 | 58 | } |
c3ef1500 TH |
59 | tomoyo_warn_oom(__func__); |
60 | return false; | |
61 | } | |
62 | ||
63 | /** | |
64 | * tomoyo_commit_ok - Check memory quota. | |
65 | * | |
66 | * @data: Data to copy from. | |
67 | * @size: Size in byte. | |
68 | * | |
69 | * Returns pointer to allocated memory on success, NULL otherwise. | |
70 | * @data is zero-cleared on success. | |
a427fd14 TH |
71 | * |
72 | * Caller holds tomoyo_policy_lock mutex. | |
c3ef1500 TH |
73 | */ |
74 | void *tomoyo_commit_ok(void *data, const unsigned int size) | |
75 | { | |
76 | void *ptr = kzalloc(size, GFP_NOFS); | |
cdcf6723 | 77 | |
c3ef1500 TH |
78 | if (tomoyo_memory_ok(ptr)) { |
79 | memmove(ptr, data, size); | |
80 | memset(data, 0, size); | |
81 | return ptr; | |
82 | } | |
cfc64fd9 | 83 | kfree(ptr); |
c3ef1500 TH |
84 | return NULL; |
85 | } | |
86 | ||
7c2ea22e TH |
87 | /** |
88 | * tomoyo_get_group - Allocate memory for "struct tomoyo_path_group"/"struct tomoyo_number_group". | |
89 | * | |
a238cf5b TH |
90 | * @param: Pointer to "struct tomoyo_acl_param". |
91 | * @idx: Index number. | |
7c2ea22e TH |
92 | * |
93 | * Returns pointer to "struct tomoyo_group" on success, NULL otherwise. | |
94 | */ | |
a238cf5b TH |
95 | struct tomoyo_group *tomoyo_get_group(struct tomoyo_acl_param *param, |
96 | const u8 idx) | |
7c2ea22e TH |
97 | { |
98 | struct tomoyo_group e = { }; | |
99 | struct tomoyo_group *group = NULL; | |
a238cf5b TH |
100 | struct list_head *list; |
101 | const char *group_name = tomoyo_read_token(param); | |
7c2ea22e | 102 | bool found = false; |
cdcf6723 | 103 | |
7c2ea22e TH |
104 | if (!tomoyo_correct_word(group_name) || idx >= TOMOYO_MAX_GROUP) |
105 | return NULL; | |
106 | e.group_name = tomoyo_get_name(group_name); | |
107 | if (!e.group_name) | |
108 | return NULL; | |
109 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) | |
110 | goto out; | |
bd03a3e4 | 111 | list = ¶m->ns->group_list[idx]; |
a238cf5b | 112 | list_for_each_entry(group, list, head.list) { |
f9732ea1 TH |
113 | if (e.group_name != group->group_name || |
114 | atomic_read(&group->head.users) == TOMOYO_GC_IN_PROGRESS) | |
7c2ea22e | 115 | continue; |
0df7e8b8 | 116 | atomic_inc(&group->head.users); |
7c2ea22e TH |
117 | found = true; |
118 | break; | |
119 | } | |
120 | if (!found) { | |
121 | struct tomoyo_group *entry = tomoyo_commit_ok(&e, sizeof(e)); | |
cdcf6723 | 122 | |
7c2ea22e TH |
123 | if (entry) { |
124 | INIT_LIST_HEAD(&entry->member_list); | |
0df7e8b8 | 125 | atomic_set(&entry->head.users, 1); |
a238cf5b | 126 | list_add_tail_rcu(&entry->head.list, list); |
7c2ea22e TH |
127 | group = entry; |
128 | found = true; | |
129 | } | |
130 | } | |
131 | mutex_unlock(&tomoyo_policy_lock); | |
a238cf5b | 132 | out: |
7c2ea22e TH |
133 | tomoyo_put_name(e.group_name); |
134 | return found ? group : NULL; | |
135 | } | |
136 | ||
c3ef1500 TH |
137 | /* |
138 | * tomoyo_name_list is used for holding string data used by TOMOYO. | |
139 | * Since same string data is likely used for multiple times (e.g. | |
140 | * "/lib/libc-2.5.so"), TOMOYO shares string data in the form of | |
141 | * "const struct tomoyo_path_info *". | |
142 | */ | |
143 | struct list_head tomoyo_name_list[TOMOYO_MAX_HASH]; | |
144 | ||
145 | /** | |
146 | * tomoyo_get_name - Allocate permanent memory for string data. | |
147 | * | |
148 | * @name: The string to store into the permernent memory. | |
149 | * | |
150 | * Returns pointer to "struct tomoyo_path_info" on success, NULL otherwise. | |
151 | */ | |
152 | const struct tomoyo_path_info *tomoyo_get_name(const char *name) | |
153 | { | |
e2bf6907 | 154 | struct tomoyo_name *ptr; |
c3ef1500 TH |
155 | unsigned int hash; |
156 | int len; | |
c3ef1500 TH |
157 | struct list_head *head; |
158 | ||
159 | if (!name) | |
160 | return NULL; | |
161 | len = strlen(name) + 1; | |
8387ff25 | 162 | hash = full_name_hash(NULL, (const unsigned char *) name, len - 1); |
c3ef1500 TH |
163 | head = &tomoyo_name_list[hash_long(hash, TOMOYO_HASH_BITS)]; |
164 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) | |
165 | return NULL; | |
0df7e8b8 | 166 | list_for_each_entry(ptr, head, head.list) { |
f9732ea1 TH |
167 | if (hash != ptr->entry.hash || strcmp(name, ptr->entry.name) || |
168 | atomic_read(&ptr->head.users) == TOMOYO_GC_IN_PROGRESS) | |
c3ef1500 | 169 | continue; |
0df7e8b8 | 170 | atomic_inc(&ptr->head.users); |
c3ef1500 TH |
171 | goto out; |
172 | } | |
173 | ptr = kzalloc(sizeof(*ptr) + len, GFP_NOFS); | |
b22b8b9f TH |
174 | if (tomoyo_memory_ok(ptr)) { |
175 | ptr->entry.name = ((char *) ptr) + sizeof(*ptr); | |
176 | memmove((char *) ptr->entry.name, name, len); | |
177 | atomic_set(&ptr->head.users, 1); | |
178 | tomoyo_fill_path_info(&ptr->entry); | |
179 | list_add_tail(&ptr->head.list, head); | |
180 | } else { | |
c3ef1500 TH |
181 | kfree(ptr); |
182 | ptr = NULL; | |
c3ef1500 | 183 | } |
b22b8b9f | 184 | out: |
c3ef1500 TH |
185 | mutex_unlock(&tomoyo_policy_lock); |
186 | return ptr ? &ptr->entry : NULL; | |
187 | } | |
188 | ||
bd03a3e4 TH |
189 | /* Initial namespace.*/ |
190 | struct tomoyo_policy_namespace tomoyo_kernel_namespace; | |
191 | ||
c3ef1500 TH |
192 | /** |
193 | * tomoyo_mm_init - Initialize mm related code. | |
194 | */ | |
195 | void __init tomoyo_mm_init(void) | |
196 | { | |
197 | int idx; | |
cdcf6723 | 198 | |
c3ef1500 TH |
199 | for (idx = 0; idx < TOMOYO_MAX_HASH; idx++) |
200 | INIT_LIST_HEAD(&tomoyo_name_list[idx]); | |
bd03a3e4 TH |
201 | tomoyo_kernel_namespace.name = "<kernel>"; |
202 | tomoyo_init_policy_namespace(&tomoyo_kernel_namespace); | |
203 | tomoyo_kernel_domain.ns = &tomoyo_kernel_namespace; | |
c3ef1500 | 204 | INIT_LIST_HEAD(&tomoyo_kernel_domain.acl_info_list); |
bd03a3e4 | 205 | tomoyo_kernel_domain.domainname = tomoyo_get_name("<kernel>"); |
c3ef1500 | 206 | list_add_tail_rcu(&tomoyo_kernel_domain.list, &tomoyo_domain_list); |
c3ef1500 | 207 | } |