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 |
3519 |
* Version: 1.7.2-pre 2010/03/21 |
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 |
2932 |
void ccs_warn_oom(const char *function) |
19 |
kumaneko |
2908 |
{ |
20 |
|
|
/* Reduce error messages. */ |
21 |
|
|
static pid_t ccs_last_pid; |
22 |
|
|
const pid_t pid = current->pid; |
23 |
|
|
if (ccs_last_pid != pid) { |
24 |
|
|
printk(KERN_WARNING "ERROR: Out of memory at %s.\n", |
25 |
|
|
function); |
26 |
|
|
ccs_last_pid = pid; |
27 |
|
|
} |
28 |
|
|
if (!ccs_policy_loaded) |
29 |
|
|
panic("MAC Initialization failed.\n"); |
30 |
|
|
} |
31 |
|
|
|
32 |
kumaneko |
2903 |
static atomic_t ccs_policy_memory_size; |
33 |
|
|
static unsigned int ccs_quota_for_policy; |
34 |
kumaneko |
2864 |
|
35 |
|
|
/** |
36 |
|
|
* ccs_memory_ok - Check memory quota. |
37 |
|
|
* |
38 |
|
|
* @ptr: Pointer to allocated memory. |
39 |
|
|
* @size: Size in byte. |
40 |
|
|
* |
41 |
kumaneko |
3104 |
* Returns true if @ptr is not NULL and quota not exceeded, false otherwise. |
42 |
kumaneko |
2864 |
*/ |
43 |
|
|
bool ccs_memory_ok(const void *ptr, const unsigned int size) |
44 |
|
|
{ |
45 |
kumaneko |
2900 |
size_t s = ccs_round2(size); |
46 |
kumaneko |
2903 |
atomic_add(s, &ccs_policy_memory_size); |
47 |
|
|
if (ptr && (!ccs_quota_for_policy || |
48 |
|
|
atomic_read(&ccs_policy_memory_size) |
49 |
|
|
<= ccs_quota_for_policy)) |
50 |
kumaneko |
2864 |
return true; |
51 |
kumaneko |
2903 |
atomic_sub(s, &ccs_policy_memory_size); |
52 |
kumaneko |
2908 |
ccs_warn_oom(__func__); |
53 |
kumaneko |
2864 |
return false; |
54 |
|
|
} |
55 |
|
|
|
56 |
|
|
/** |
57 |
kumaneko |
3512 |
* ccs_commit_ok - Allocate memory and check memory quota. |
58 |
kumaneko |
2864 |
* |
59 |
kumaneko |
2900 |
* @data: Data to copy from. |
60 |
|
|
* @size: Size in byte. |
61 |
kumaneko |
2864 |
* |
62 |
kumaneko |
3512 |
* Returns pointer to allocated memory on success, NULL otherwise. |
63 |
|
|
* @data is zero-cleared on success. |
64 |
kumaneko |
2864 |
*/ |
65 |
kumaneko |
3512 |
void *ccs_commit_ok(void *data, const unsigned int size) |
66 |
kumaneko |
2864 |
{ |
67 |
kumaneko |
3512 |
void *ptr = kmalloc(size, CCS_GFP_FLAGS); |
68 |
|
|
if (!ptr) |
69 |
|
|
return NULL; |
70 |
kumaneko |
2900 |
if (ccs_memory_ok(ptr, size)) { |
71 |
|
|
memmove(ptr, data, size); |
72 |
|
|
memset(data, 0, size); |
73 |
kumaneko |
3512 |
return ptr; |
74 |
kumaneko |
2864 |
} |
75 |
kumaneko |
3512 |
kfree(ptr); |
76 |
|
|
return NULL; |
77 |
kumaneko |
2864 |
} |
78 |
|
|
|
79 |
|
|
|
80 |
|
|
/** |
81 |
kumaneko |
2900 |
* ccs_memory_free - Free memory for elements. |
82 |
kumaneko |
2864 |
* |
83 |
kumaneko |
2900 |
* @ptr: Pointer to allocated memory. |
84 |
|
|
* @size: Size in byte. |
85 |
kumaneko |
2864 |
*/ |
86 |
kumaneko |
2900 |
void ccs_memory_free(const void *ptr, size_t size) |
87 |
kumaneko |
2864 |
{ |
88 |
kumaneko |
2903 |
atomic_sub(ccs_round2(size), &ccs_policy_memory_size); |
89 |
kumaneko |
2900 |
kfree(ptr); |
90 |
kumaneko |
2864 |
} |
91 |
|
|
|
92 |
kumaneko |
3131 |
LIST_HEAD(ccs_address_list); |
93 |
kumaneko |
2864 |
|
94 |
|
|
/** |
95 |
|
|
* ccs_get_ipv6_address - Keep the given IPv6 address on the RAM. |
96 |
|
|
* |
97 |
|
|
* @addr: Pointer to "struct in6_addr". |
98 |
|
|
* |
99 |
|
|
* Returns pointer to "struct in6_addr" on success, NULL otherwise. |
100 |
|
|
* |
101 |
|
|
* The RAM is shared, so NEVER try to modify or kfree() the returned address. |
102 |
|
|
*/ |
103 |
|
|
const struct in6_addr *ccs_get_ipv6_address(const struct in6_addr *addr) |
104 |
|
|
{ |
105 |
|
|
struct ccs_ipv6addr_entry *entry; |
106 |
|
|
struct ccs_ipv6addr_entry *ptr; |
107 |
|
|
int error = -ENOMEM; |
108 |
|
|
if (!addr) |
109 |
|
|
return NULL; |
110 |
kumaneko |
3512 |
entry = kzalloc(sizeof(*entry), CCS_GFP_FLAGS); |
111 |
kumaneko |
2864 |
mutex_lock(&ccs_policy_lock); |
112 |
|
|
list_for_each_entry(ptr, &ccs_address_list, list) { |
113 |
|
|
if (memcmp(&ptr->addr, addr, sizeof(*addr))) |
114 |
|
|
continue; |
115 |
|
|
atomic_inc(&ptr->users); |
116 |
|
|
error = 0; |
117 |
|
|
break; |
118 |
|
|
} |
119 |
|
|
if (error && ccs_memory_ok(entry, sizeof(*entry))) { |
120 |
|
|
ptr = entry; |
121 |
|
|
ptr->addr = *addr; |
122 |
|
|
atomic_set(&ptr->users, 1); |
123 |
|
|
list_add_tail(&ptr->list, &ccs_address_list); |
124 |
|
|
entry = NULL; |
125 |
kumaneko |
3533 |
error = 0; |
126 |
kumaneko |
2864 |
} |
127 |
|
|
mutex_unlock(&ccs_policy_lock); |
128 |
|
|
kfree(entry); |
129 |
kumaneko |
3533 |
return !error ? &ptr->addr : NULL; |
130 |
kumaneko |
2864 |
} |
131 |
|
|
|
132 |
|
|
/* The list for "struct ccs_name_entry". */ |
133 |
kumaneko |
3131 |
struct list_head ccs_name_list[CCS_MAX_HASH]; |
134 |
kumaneko |
2864 |
|
135 |
|
|
/** |
136 |
|
|
* ccs_get_name - Allocate memory for string data. |
137 |
|
|
* |
138 |
|
|
* @name: The string to store into the permernent memory. |
139 |
|
|
* |
140 |
|
|
* Returns pointer to "struct ccs_path_info" on success, NULL otherwise. |
141 |
|
|
*/ |
142 |
|
|
const struct ccs_path_info *ccs_get_name(const char *name) |
143 |
|
|
{ |
144 |
|
|
struct ccs_name_entry *ptr; |
145 |
|
|
unsigned int hash; |
146 |
|
|
int len; |
147 |
|
|
int allocated_len; |
148 |
kumaneko |
3146 |
struct list_head *head; |
149 |
kumaneko |
2864 |
|
150 |
|
|
if (!name) |
151 |
|
|
return NULL; |
152 |
|
|
len = strlen(name) + 1; |
153 |
|
|
hash = full_name_hash((const unsigned char *) name, len - 1); |
154 |
kumaneko |
3146 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0) || defined(RHEL_MAJOR) |
155 |
|
|
head = &ccs_name_list[hash_long(hash, CCS_HASH_BITS)]; |
156 |
|
|
#else |
157 |
|
|
head = &ccs_name_list[hash % CCS_MAX_HASH]; |
158 |
|
|
#endif |
159 |
kumaneko |
3519 |
mutex_lock(&ccs_policy_lock); |
160 |
kumaneko |
3146 |
list_for_each_entry(ptr, head, list) { |
161 |
kumaneko |
2864 |
if (hash != ptr->entry.hash || strcmp(name, ptr->entry.name)) |
162 |
|
|
continue; |
163 |
|
|
atomic_inc(&ptr->users); |
164 |
|
|
goto out; |
165 |
|
|
} |
166 |
kumaneko |
2900 |
allocated_len = ccs_round2(sizeof(*ptr) + len); |
167 |
kumaneko |
3512 |
ptr = kzalloc(allocated_len, CCS_GFP_FLAGS); |
168 |
kumaneko |
2903 |
if (!ptr || (ccs_quota_for_policy && |
169 |
|
|
atomic_read(&ccs_policy_memory_size) + allocated_len |
170 |
|
|
> ccs_quota_for_policy)) { |
171 |
kumaneko |
2864 |
kfree(ptr); |
172 |
|
|
ptr = NULL; |
173 |
kumaneko |
2908 |
ccs_warn_oom(__func__); |
174 |
kumaneko |
2864 |
goto out; |
175 |
|
|
} |
176 |
kumaneko |
2903 |
atomic_add(allocated_len, &ccs_policy_memory_size); |
177 |
kumaneko |
2864 |
ptr->entry.name = ((char *) ptr) + sizeof(*ptr); |
178 |
|
|
memmove((char *) ptr->entry.name, name, len); |
179 |
|
|
atomic_set(&ptr->users, 1); |
180 |
|
|
ccs_fill_path_info(&ptr->entry); |
181 |
|
|
ptr->size = allocated_len; |
182 |
kumaneko |
3146 |
list_add_tail(&ptr->list, head); |
183 |
kumaneko |
2864 |
out: |
184 |
kumaneko |
3519 |
mutex_unlock(&ccs_policy_lock); |
185 |
kumaneko |
2864 |
return ptr ? &ptr->entry : NULL; |
186 |
|
|
} |
187 |
|
|
|
188 |
|
|
/** |
189 |
kumaneko |
3078 |
* ccs_mm_init - Initialize mm related code. |
190 |
kumaneko |
2864 |
*/ |
191 |
kumaneko |
3502 |
void __init ccs_mm_init(void) |
192 |
kumaneko |
2864 |
{ |
193 |
|
|
int i; |
194 |
kumaneko |
2892 |
for (i = 0; i < CCS_MAX_HASH; i++) |
195 |
kumaneko |
2864 |
INIT_LIST_HEAD(&ccs_name_list[i]); |
196 |
|
|
INIT_LIST_HEAD(&ccs_kernel_domain.acl_info_list); |
197 |
|
|
ccs_kernel_domain.domainname = ccs_get_name(ROOT_NAME); |
198 |
|
|
list_add_tail_rcu(&ccs_kernel_domain.list, &ccs_domain_list); |
199 |
|
|
if (ccs_find_domain(ROOT_NAME) != &ccs_kernel_domain) |
200 |
|
|
panic("Can't register ccs_kernel_domain"); |
201 |
|
|
{ |
202 |
|
|
/* Load built-in policy. */ |
203 |
|
|
static char ccs_builtin_initializers[] __initdata |
204 |
|
|
= CONFIG_CCSECURITY_BUILTIN_INITIALIZERS; |
205 |
|
|
char *cp = ccs_builtin_initializers; |
206 |
|
|
ccs_normalize_line(cp); |
207 |
|
|
while (cp && *cp) { |
208 |
|
|
char *cp2 = strchr(cp, ' '); |
209 |
|
|
if (cp2) |
210 |
|
|
*cp2++ = '\0'; |
211 |
|
|
ccs_write_domain_initializer_policy(cp, false, false); |
212 |
|
|
cp = cp2; |
213 |
|
|
} |
214 |
|
|
} |
215 |
|
|
} |
216 |
|
|
|
217 |
|
|
unsigned int ccs_audit_log_memory_size; |
218 |
|
|
unsigned int ccs_quota_for_audit_log; |
219 |
|
|
|
220 |
|
|
unsigned int ccs_query_memory_size; |
221 |
|
|
unsigned int ccs_quota_for_query; |
222 |
|
|
|
223 |
|
|
/** |
224 |
|
|
* ccs_read_memory_counter - Check for memory usage. |
225 |
|
|
* |
226 |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
227 |
|
|
*/ |
228 |
kumaneko |
2943 |
void ccs_read_memory_counter(struct ccs_io_buffer *head) |
229 |
kumaneko |
2864 |
{ |
230 |
kumaneko |
2943 |
const unsigned int usage[3] = { |
231 |
|
|
atomic_read(&ccs_policy_memory_size), |
232 |
|
|
ccs_audit_log_memory_size, |
233 |
|
|
ccs_query_memory_size |
234 |
|
|
}; |
235 |
|
|
const unsigned int quota[3] = { |
236 |
|
|
ccs_quota_for_policy, |
237 |
|
|
ccs_quota_for_audit_log, |
238 |
|
|
ccs_quota_for_query |
239 |
|
|
}; |
240 |
|
|
static const char *header[4] = { |
241 |
|
|
"Policy: ", |
242 |
|
|
"Audit logs: ", |
243 |
|
|
"Query lists:", |
244 |
|
|
"Total: " |
245 |
|
|
}; |
246 |
|
|
unsigned int total = 0; |
247 |
|
|
int i; |
248 |
|
|
if (head->read_eof) |
249 |
|
|
return; |
250 |
|
|
for (i = 0; i < 3; i++) { |
251 |
|
|
total += usage[i]; |
252 |
|
|
ccs_io_printf(head, "%s %10u", header[i], usage[i]); |
253 |
|
|
if (quota[i]) |
254 |
|
|
ccs_io_printf(head, " (Quota: %10u)", quota[i]); |
255 |
|
|
ccs_io_printf(head, "\n"); |
256 |
kumaneko |
2864 |
} |
257 |
kumaneko |
2943 |
ccs_io_printf(head, "%s %10u\n", header[3], total); |
258 |
|
|
head->read_eof = true; |
259 |
kumaneko |
2864 |
} |
260 |
|
|
|
261 |
|
|
/** |
262 |
|
|
* ccs_write_memory_quota - Set memory quota. |
263 |
|
|
* |
264 |
|
|
* @head: Pointer to "struct ccs_io_buffer". |
265 |
|
|
* |
266 |
|
|
* Returns 0. |
267 |
|
|
*/ |
268 |
|
|
int ccs_write_memory_quota(struct ccs_io_buffer *head) |
269 |
|
|
{ |
270 |
|
|
char *data = head->write_buf; |
271 |
|
|
unsigned int size; |
272 |
kumaneko |
2903 |
if (sscanf(data, "Policy: %u", &size) == 1) |
273 |
|
|
ccs_quota_for_policy = size; |
274 |
kumaneko |
2864 |
else if (sscanf(data, "Audit logs: %u", &size) == 1) |
275 |
|
|
ccs_quota_for_audit_log = size; |
276 |
kumaneko |
2903 |
else if (sscanf(data, "Query lists: %u", &size) == 1) |
277 |
kumaneko |
2864 |
ccs_quota_for_query = size; |
278 |
|
|
return 0; |
279 |
|
|
} |