1 |
kumaneko |
2864 |
/* |
2 |
kumaneko |
3033 |
* security/ccsecurity/memory.c |
3 |
kumaneko |
2864 |
* |
4 |
kumaneko |
3502 |
* Copyright (C) 2005-2010 NTT DATA CORPORATION |
5 |
kumaneko |
2864 |
* |
6 |
kumaneko |
3731 |
* Version: 1.7.2+ 2010/06/04 |
7 |
kumaneko |
2864 |
* |
8 |
|
|
* This file is applicable to both 2.4.30 and 2.6.11 and later. |
9 |
|
|
* See README.ccs for ChangeLog. |
10 |
|
|
* |
11 |
|
|
*/ |
12 |
|
|
|
13 |
|
|
#include "internal.h" |
14 |
kumaneko |
3146 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0) || defined(RHEL_MAJOR) |
15 |
|
|
#include <linux/hash.h> |
16 |
|
|
#endif |
17 |
kumaneko |
2864 |
|
18 |
kumaneko |
3643 |
/** |
19 |
|
|
* ccs_warn_oom - Print out of memory warning message. |
20 |
|
|
* |
21 |
|
|
* @function: Function's name. |
22 |
|
|
*/ |
23 |
kumaneko |
2932 |
void ccs_warn_oom(const char *function) |
24 |
kumaneko |
2908 |
{ |
25 |
|
|
/* Reduce error messages. */ |
26 |
|
|
static pid_t ccs_last_pid; |
27 |
|
|
const pid_t pid = current->pid; |
28 |
|
|
if (ccs_last_pid != pid) { |
29 |
|
|
printk(KERN_WARNING "ERROR: Out of memory at %s.\n", |
30 |
|
|
function); |
31 |
|
|
ccs_last_pid = pid; |
32 |
|
|
} |
33 |
|
|
if (!ccs_policy_loaded) |
34 |
|
|
panic("MAC Initialization failed.\n"); |
35 |
|
|
} |
36 |
|
|
|
37 |
kumaneko |
3643 |
/* Memory allocated for policy. */ |
38 |
kumaneko |
2903 |
static atomic_t ccs_policy_memory_size; |
39 |
kumaneko |
3643 |
/* Quota for holding policy. */ |
40 |
kumaneko |
2903 |
static unsigned int ccs_quota_for_policy; |
41 |
kumaneko |
2864 |
|
42 |
|
|
/** |
43 |
|
|
* ccs_memory_ok - Check memory quota. |
44 |
|
|
* |
45 |
|
|
* @ptr: Pointer to allocated memory. |
46 |
|
|
* @size: Size in byte. |
47 |
|
|
* |
48 |
kumaneko |
3104 |
* Returns true if @ptr is not NULL and quota not exceeded, false otherwise. |
49 |
kumaneko |
2864 |
*/ |
50 |
|
|
bool ccs_memory_ok(const void *ptr, const unsigned int size) |
51 |
|
|
{ |
52 |
kumaneko |
2900 |
size_t s = ccs_round2(size); |
53 |
kumaneko |
2903 |
atomic_add(s, &ccs_policy_memory_size); |
54 |
|
|
if (ptr && (!ccs_quota_for_policy || |
55 |
|
|
atomic_read(&ccs_policy_memory_size) |
56 |
|
|
<= ccs_quota_for_policy)) |
57 |
kumaneko |
2864 |
return true; |
58 |
kumaneko |
2903 |
atomic_sub(s, &ccs_policy_memory_size); |
59 |
kumaneko |
2908 |
ccs_warn_oom(__func__); |
60 |
kumaneko |
2864 |
return false; |
61 |
|
|
} |
62 |
|
|
|
63 |
|
|
/** |
64 |
kumaneko |
3512 |
* ccs_commit_ok - Allocate memory and check memory quota. |
65 |
kumaneko |
2864 |
* |
66 |
kumaneko |
2900 |
* @data: Data to copy from. |
67 |
|
|
* @size: Size in byte. |
68 |
kumaneko |
2864 |
* |
69 |
kumaneko |
3512 |
* Returns pointer to allocated memory on success, NULL otherwise. |
70 |
|
|
* @data is zero-cleared on success. |
71 |
kumaneko |
2864 |
*/ |
72 |
kumaneko |
3512 |
void *ccs_commit_ok(void *data, const unsigned int size) |
73 |
kumaneko |
2864 |
{ |
74 |
kumaneko |
3512 |
void *ptr = kmalloc(size, CCS_GFP_FLAGS); |
75 |
kumaneko |
2900 |
if (ccs_memory_ok(ptr, size)) { |
76 |
|
|
memmove(ptr, data, size); |
77 |
|
|
memset(data, 0, size); |
78 |
kumaneko |
3512 |
return ptr; |
79 |
kumaneko |
2864 |
} |
80 |
kumaneko |
3512 |
kfree(ptr); |
81 |
|
|
return NULL; |
82 |
kumaneko |
2864 |
} |
83 |
|
|
|
84 |
|
|
/** |
85 |
kumaneko |
2900 |
* ccs_memory_free - Free memory for elements. |
86 |
kumaneko |
2864 |
* |
87 |
kumaneko |
2900 |
* @ptr: Pointer to allocated memory. |
88 |
|
|
* @size: Size in byte. |
89 |
kumaneko |
2864 |
*/ |
90 |
kumaneko |
2900 |
void ccs_memory_free(const void *ptr, size_t size) |
91 |
kumaneko |
2864 |
{ |
92 |
kumaneko |
2903 |
atomic_sub(ccs_round2(size), &ccs_policy_memory_size); |
93 |
kumaneko |
2900 |
kfree(ptr); |
94 |
kumaneko |
2864 |
} |
95 |
|
|
|
96 |
kumaneko |
3689 |
/** |
97 |
|
|
* ccs_get_group - Allocate memory for "struct ccs_path_group"/"struct ccs_number_group"/"struct ccs_address_group". |
98 |
|
|
* |
99 |
|
|
* @group_name: The name of address group. |
100 |
|
|
* @idx: Index number. |
101 |
|
|
* |
102 |
|
|
* Returns pointer to "struct ccs_group" on success, NULL otherwise. |
103 |
|
|
*/ |
104 |
|
|
struct ccs_group *ccs_get_group(const char *group_name, const u8 idx) |
105 |
|
|
{ |
106 |
kumaneko |
3697 |
struct ccs_group e = { }; |
107 |
kumaneko |
3689 |
struct ccs_group *group = NULL; |
108 |
kumaneko |
3697 |
bool found = false; |
109 |
kumaneko |
3707 |
if (!ccs_correct_word(group_name) || idx >= CCS_MAX_GROUP) |
110 |
kumaneko |
3689 |
return NULL; |
111 |
kumaneko |
3697 |
e.group_name = ccs_get_name(group_name); |
112 |
|
|
if (!e.group_name) |
113 |
kumaneko |
3689 |
return NULL; |
114 |
|
|
if (mutex_lock_interruptible(&ccs_policy_lock)) |
115 |
|
|
goto out; |
116 |
kumaneko |
3697 |
list_for_each_entry(group, &ccs_group_list[idx], head.list) { |
117 |
|
|
if (e.group_name != group->group_name) |
118 |
kumaneko |
3689 |
continue; |
119 |
|
|
atomic_inc(&group->head.users); |
120 |
kumaneko |
3697 |
found = true; |
121 |
kumaneko |
3689 |
break; |
122 |
|
|
} |
123 |
kumaneko |
3697 |
if (!found) { |
124 |
|
|
struct ccs_group *entry = ccs_commit_ok(&e, sizeof(e)); |
125 |
|
|
if (entry) { |
126 |
|
|
INIT_LIST_HEAD(&entry->member_list); |
127 |
|
|
atomic_set(&entry->head.users, 1); |
128 |
|
|
list_add_tail_rcu(&entry->head.list, |
129 |
|
|
&ccs_group_list[idx]); |
130 |
|
|
group = entry; |
131 |
|
|
found = true; |
132 |
|
|
} |
133 |
kumaneko |
3689 |
} |
134 |
|
|
mutex_unlock(&ccs_policy_lock); |
135 |
|
|
out: |
136 |
kumaneko |
3697 |
ccs_put_name(e.group_name); |
137 |
|
|
return found ? group : NULL; |
138 |
kumaneko |
3689 |
} |
139 |
kumaneko |
2864 |
|
140 |
|
|
/** |
141 |
|
|
* ccs_get_ipv6_address - Keep the given IPv6 address on the RAM. |
142 |
|
|
* |
143 |
|
|
* @addr: Pointer to "struct in6_addr". |
144 |
|
|
* |
145 |
|
|
* Returns pointer to "struct in6_addr" on success, NULL otherwise. |
146 |
|
|
* |
147 |
|
|
* The RAM is shared, so NEVER try to modify or kfree() the returned address. |
148 |
|
|
*/ |
149 |
|
|
const struct in6_addr *ccs_get_ipv6_address(const struct in6_addr *addr) |
150 |
|
|
{ |
151 |
kumaneko |
3693 |
struct ccs_ipv6addr *entry; |
152 |
|
|
struct ccs_ipv6addr *ptr = NULL; |
153 |
kumaneko |
2864 |
int error = -ENOMEM; |
154 |
|
|
if (!addr) |
155 |
|
|
return NULL; |
156 |
kumaneko |
3512 |
entry = kzalloc(sizeof(*entry), CCS_GFP_FLAGS); |
157 |
kumaneko |
3534 |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
158 |
|
|
goto out; |
159 |
kumaneko |
3689 |
list_for_each_entry(ptr, &ccs_shared_list[CCS_IPV6ADDRESS_LIST], |
160 |
|
|
head.list) { |
161 |
kumaneko |
2864 |
if (memcmp(&ptr->addr, addr, sizeof(*addr))) |
162 |
|
|
continue; |
163 |
kumaneko |
3689 |
atomic_inc(&ptr->head.users); |
164 |
kumaneko |
2864 |
error = 0; |
165 |
|
|
break; |
166 |
|
|
} |
167 |
|
|
if (error && ccs_memory_ok(entry, sizeof(*entry))) { |
168 |
|
|
ptr = entry; |
169 |
|
|
ptr->addr = *addr; |
170 |
kumaneko |
3689 |
atomic_set(&ptr->head.users, 1); |
171 |
|
|
list_add_tail(&ptr->head.list, |
172 |
|
|
&ccs_shared_list[CCS_IPV6ADDRESS_LIST]); |
173 |
kumaneko |
2864 |
entry = NULL; |
174 |
kumaneko |
3533 |
error = 0; |
175 |
kumaneko |
2864 |
} |
176 |
|
|
mutex_unlock(&ccs_policy_lock); |
177 |
kumaneko |
3534 |
out: |
178 |
kumaneko |
2864 |
kfree(entry); |
179 |
kumaneko |
3533 |
return !error ? &ptr->addr : NULL; |
180 |
kumaneko |
2864 |
} |
181 |
|
|
|
182 |
kumaneko |
3693 |
/* The list for "struct ccs_name". */ |
183 |
kumaneko |
3131 |
struct list_head ccs_name_list[CCS_MAX_HASH]; |
184 |
kumaneko |
2864 |
|
185 |
|
|
/** |
186 |
|
|
* ccs_get_name - Allocate memory for string data. |
187 |
|
|
* |
188 |
|
|
* @name: The string to store into the permernent memory. |
189 |
|
|
* |
190 |
|
|
* Returns pointer to "struct ccs_path_info" on success, NULL otherwise. |
191 |
|
|
*/ |
192 |
|
|
const struct ccs_path_info *ccs_get_name(const char *name) |
193 |
|
|
{ |
194 |
kumaneko |
3693 |
struct ccs_name *ptr; |
195 |
kumaneko |
2864 |
unsigned int hash; |
196 |
|
|
int len; |
197 |
|
|
int allocated_len; |
198 |
kumaneko |
3146 |
struct list_head *head; |
199 |
kumaneko |
2864 |
|
200 |
|
|
if (!name) |
201 |
|
|
return NULL; |
202 |
|
|
len = strlen(name) + 1; |
203 |
|
|
hash = full_name_hash((const unsigned char *) name, len - 1); |
204 |
kumaneko |
3146 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0) || defined(RHEL_MAJOR) |
205 |
|
|
head = &ccs_name_list[hash_long(hash, CCS_HASH_BITS)]; |
206 |
|
|
#else |
207 |
|
|
head = &ccs_name_list[hash % CCS_MAX_HASH]; |
208 |
|
|
#endif |
209 |
kumaneko |
3534 |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
210 |
|
|
return NULL; |
211 |
kumaneko |
3689 |
list_for_each_entry(ptr, head, head.list) { |
212 |
kumaneko |
2864 |
if (hash != ptr->entry.hash || strcmp(name, ptr->entry.name)) |
213 |
|
|
continue; |
214 |
kumaneko |
3689 |
atomic_inc(&ptr->head.users); |
215 |
kumaneko |
2864 |
goto out; |
216 |
|
|
} |
217 |
kumaneko |
3697 |
allocated_len = sizeof(*ptr) + len; |
218 |
kumaneko |
3512 |
ptr = kzalloc(allocated_len, CCS_GFP_FLAGS); |
219 |
kumaneko |
3697 |
if (ccs_memory_ok(ptr, allocated_len)) { |
220 |
|
|
ptr->entry.name = ((char *) ptr) + sizeof(*ptr); |
221 |
|
|
memmove((char *) ptr->entry.name, name, len); |
222 |
|
|
atomic_set(&ptr->head.users, 1); |
223 |
|
|
ccs_fill_path_info(&ptr->entry); |
224 |
|
|
ptr->size = allocated_len; |
225 |
|
|
list_add_tail(&ptr->head.list, head); |
226 |
|
|
} else { |
227 |
kumaneko |
2864 |
kfree(ptr); |
228 |
|
|
ptr = NULL; |
229 |
|
|
} |
230 |
|
|
out: |
231 |
kumaneko |
3519 |
mutex_unlock(&ccs_policy_lock); |
232 |
kumaneko |
2864 |
return ptr ? &ptr->entry : NULL; |
233 |
|
|
} |
234 |
|
|
|
235 |
|
|
/** |
236 |
kumaneko |
3078 |
* ccs_mm_init - Initialize mm related code. |
237 |
kumaneko |
2864 |
*/ |
238 |
kumaneko |
3502 |
void __init ccs_mm_init(void) |
239 |
kumaneko |
2864 |
{ |
240 |
kumaneko |
3535 |
int idx; |
241 |
|
|
for (idx = 0; idx < CCS_MAX_HASH; idx++) |
242 |
|
|
INIT_LIST_HEAD(&ccs_name_list[idx]); |
243 |
kumaneko |
3697 |
INIT_LIST_HEAD(&ccs_global_domain.acl_info_list); |
244 |
kumaneko |
2864 |
INIT_LIST_HEAD(&ccs_kernel_domain.acl_info_list); |
245 |
kumaneko |
3707 |
ccs_kernel_domain.domainname = ccs_get_name(CCS_ROOT_NAME); |
246 |
kumaneko |
2864 |
list_add_tail_rcu(&ccs_kernel_domain.list, &ccs_domain_list); |
247 |
kumaneko |
3535 |
idx = ccs_read_lock(); |
248 |
kumaneko |
3707 |
if (ccs_find_domain(CCS_ROOT_NAME) != &ccs_kernel_domain) |
249 |
kumaneko |
2864 |
panic("Can't register ccs_kernel_domain"); |
250 |
|
|
{ |
251 |
|
|
/* Load built-in policy. */ |
252 |
|
|
static char ccs_builtin_initializers[] __initdata |
253 |
|
|
= CONFIG_CCSECURITY_BUILTIN_INITIALIZERS; |
254 |
|
|
char *cp = ccs_builtin_initializers; |
255 |
|
|
ccs_normalize_line(cp); |
256 |
|
|
while (cp && *cp) { |
257 |
|
|
char *cp2 = strchr(cp, ' '); |
258 |
|
|
if (cp2) |
259 |
|
|
*cp2++ = '\0'; |
260 |
kumaneko |
3752 |
ccs_write_transition_control(cp, false, |
261 |
|
|
CCS_TRANSITION_CONTROL_INITIALIZE); |
262 |
kumaneko |
2864 |
cp = cp2; |
263 |
|
|
} |
264 |
|
|
} |
265 |
kumaneko |
3535 |
ccs_read_unlock(idx); |
266 |
kumaneko |
2864 |
} |
267 |
|
|
|
268 |
kumaneko |
3643 |
/* Memory allocated for audit logs. */ |
269 |
kumaneko |
3694 |
unsigned int ccs_log_memory_size; |
270 |
kumaneko |
3643 |
/* Quota for holding audit logs. */ |
271 |
kumaneko |
3694 |
unsigned int ccs_quota_for_log; |
272 |
kumaneko |
2864 |
|
273 |
kumaneko |
3643 |
/* Memory allocated for query lists. */ |
274 |
kumaneko |
2864 |
unsigned int ccs_query_memory_size; |
275 |
kumaneko |
3643 |
/* Quota for holding query lists. */ |
276 |
kumaneko |
2864 |
unsigned int ccs_quota_for_query; |
277 |
|
|
|
278 |
|
|
/** |
279 |
|
|
* ccs_read_memory_counter - Check for memory usage. |
280 |
|
|
* |
281 |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
282 |
|
|
*/ |
283 |
kumaneko |
2943 |
void ccs_read_memory_counter(struct ccs_io_buffer *head) |
284 |
kumaneko |
2864 |
{ |
285 |
kumaneko |
2943 |
const unsigned int usage[3] = { |
286 |
|
|
atomic_read(&ccs_policy_memory_size), |
287 |
kumaneko |
3694 |
ccs_log_memory_size, |
288 |
kumaneko |
2943 |
ccs_query_memory_size |
289 |
|
|
}; |
290 |
|
|
const unsigned int quota[3] = { |
291 |
|
|
ccs_quota_for_policy, |
292 |
kumaneko |
3694 |
ccs_quota_for_log, |
293 |
kumaneko |
2943 |
ccs_quota_for_query |
294 |
|
|
}; |
295 |
|
|
static const char *header[4] = { |
296 |
|
|
"Policy: ", |
297 |
|
|
"Audit logs: ", |
298 |
|
|
"Query lists:", |
299 |
|
|
"Total: " |
300 |
|
|
}; |
301 |
|
|
unsigned int total = 0; |
302 |
|
|
int i; |
303 |
|
|
if (head->read_eof) |
304 |
|
|
return; |
305 |
|
|
for (i = 0; i < 3; i++) { |
306 |
|
|
total += usage[i]; |
307 |
|
|
ccs_io_printf(head, "%s %10u", header[i], usage[i]); |
308 |
|
|
if (quota[i]) |
309 |
|
|
ccs_io_printf(head, " (Quota: %10u)", quota[i]); |
310 |
|
|
ccs_io_printf(head, "\n"); |
311 |
kumaneko |
2864 |
} |
312 |
kumaneko |
2943 |
ccs_io_printf(head, "%s %10u\n", header[3], total); |
313 |
|
|
head->read_eof = true; |
314 |
kumaneko |
2864 |
} |
315 |
|
|
|
316 |
|
|
/** |
317 |
|
|
* ccs_write_memory_quota - Set memory quota. |
318 |
|
|
* |
319 |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
320 |
|
|
* |
321 |
|
|
* Returns 0. |
322 |
|
|
*/ |
323 |
|
|
int ccs_write_memory_quota(struct ccs_io_buffer *head) |
324 |
|
|
{ |
325 |
|
|
char *data = head->write_buf; |
326 |
|
|
unsigned int size; |
327 |
kumaneko |
2903 |
if (sscanf(data, "Policy: %u", &size) == 1) |
328 |
|
|
ccs_quota_for_policy = size; |
329 |
kumaneko |
2864 |
else if (sscanf(data, "Audit logs: %u", &size) == 1) |
330 |
kumaneko |
3694 |
ccs_quota_for_log = size; |
331 |
kumaneko |
2903 |
else if (sscanf(data, "Query lists: %u", &size) == 1) |
332 |
kumaneko |
2864 |
ccs_quota_for_query = size; |
333 |
|
|
return 0; |
334 |
|
|
} |