1 |
/* |
/* |
2 |
* security/ccsecurity/memory.c |
* security/ccsecurity/memory.c |
3 |
* |
* |
4 |
* Copyright (C) 2005-2009 NTT DATA CORPORATION |
* Copyright (C) 2005-2010 NTT DATA CORPORATION |
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* |
* |
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* Version: 1.7.1-pre 2009/11/03 |
* Version: 1.7.2+ 2010/06/04 |
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* |
* |
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* This file is applicable to both 2.4.30 and 2.6.11 and later. |
* This file is applicable to both 2.4.30 and 2.6.11 and later. |
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* See README.ccs for ChangeLog. |
* See README.ccs for ChangeLog. |
11 |
*/ |
*/ |
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|
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#include "internal.h" |
#include "internal.h" |
14 |
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0) || defined(RHEL_MAJOR) |
15 |
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#include <linux/hash.h> |
16 |
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#endif |
17 |
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|
18 |
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/** |
19 |
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* ccs_warn_oom - Print out of memory warning message. |
20 |
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* |
21 |
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* @function: Function's name. |
22 |
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*/ |
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void ccs_warn_oom(const char *function) |
void ccs_warn_oom(const char *function) |
24 |
{ |
{ |
25 |
/* Reduce error messages. */ |
/* Reduce error messages. */ |
34 |
panic("MAC Initialization failed.\n"); |
panic("MAC Initialization failed.\n"); |
35 |
} |
} |
36 |
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|
37 |
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/* Memory allocated for policy. */ |
38 |
static atomic_t ccs_policy_memory_size; |
static atomic_t ccs_policy_memory_size; |
39 |
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/* Quota for holding policy. */ |
40 |
static unsigned int ccs_quota_for_policy; |
static unsigned int ccs_quota_for_policy; |
41 |
|
|
42 |
/** |
/** |
61 |
} |
} |
62 |
|
|
63 |
/** |
/** |
64 |
* ccs_commit_ok - Check memory quota. |
* ccs_commit_ok - Allocate memory and check memory quota. |
65 |
* |
* |
|
* @ptr: Pointer to allocated memory. |
|
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* @data: Data to copy from. |
* @data: Data to copy from. |
67 |
* @size: Size in byte. |
* @size: Size in byte. |
68 |
* |
* |
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* Returns true if @ptr is not NULL and quota not exceeded, false otherwise. |
* Returns pointer to allocated memory on success, NULL otherwise. |
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* @data is zero-cleared on success. |
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*/ |
*/ |
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bool ccs_commit_ok(void *ptr, void *data, const unsigned int size) |
void *ccs_commit_ok(void *data, const unsigned int size) |
73 |
{ |
{ |
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|
void *ptr = kmalloc(size, CCS_GFP_FLAGS); |
75 |
if (ccs_memory_ok(ptr, size)) { |
if (ccs_memory_ok(ptr, size)) { |
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memmove(ptr, data, size); |
memmove(ptr, data, size); |
77 |
memset(data, 0, size); |
memset(data, 0, size); |
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return true; |
return ptr; |
79 |
} |
} |
80 |
return false; |
kfree(ptr); |
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|
return NULL; |
82 |
} |
} |
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|
84 |
/** |
/** |
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* ccs_memory_free - Free memory for elements. |
* ccs_memory_free - Free memory for elements. |
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* |
* |
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kfree(ptr); |
kfree(ptr); |
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} |
} |
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|
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LIST_HEAD(ccs_address_list); |
/** |
97 |
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* ccs_get_group - Allocate memory for "struct ccs_path_group"/"struct ccs_number_group"/"struct ccs_address_group". |
98 |
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* |
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* @group_name: The name of address group. |
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* @idx: Index number. |
101 |
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* |
102 |
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* Returns pointer to "struct ccs_group" on success, NULL otherwise. |
103 |
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*/ |
104 |
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struct ccs_group *ccs_get_group(const char *group_name, const u8 idx) |
105 |
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{ |
106 |
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struct ccs_group e = { }; |
107 |
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struct ccs_group *group = NULL; |
108 |
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bool found = false; |
109 |
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if (!ccs_correct_word(group_name) || idx >= CCS_MAX_GROUP) |
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return NULL; |
111 |
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e.group_name = ccs_get_name(group_name); |
112 |
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if (!e.group_name) |
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return NULL; |
114 |
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if (mutex_lock_interruptible(&ccs_policy_lock)) |
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goto out; |
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list_for_each_entry(group, &ccs_group_list[idx], head.list) { |
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if (e.group_name != group->group_name) |
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continue; |
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atomic_inc(&group->head.users); |
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found = true; |
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break; |
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} |
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if (!found) { |
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struct ccs_group *entry = ccs_commit_ok(&e, sizeof(e)); |
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if (entry) { |
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INIT_LIST_HEAD(&entry->member_list); |
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atomic_set(&entry->head.users, 1); |
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list_add_tail_rcu(&entry->head.list, |
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&ccs_group_list[idx]); |
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group = entry; |
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found = true; |
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} |
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} |
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mutex_unlock(&ccs_policy_lock); |
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out: |
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ccs_put_name(e.group_name); |
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return found ? group : NULL; |
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} |
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|
|
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/** |
/** |
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* ccs_get_ipv6_address - Keep the given IPv6 address on the RAM. |
* ccs_get_ipv6_address - Keep the given IPv6 address on the RAM. |
148 |
*/ |
*/ |
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const struct in6_addr *ccs_get_ipv6_address(const struct in6_addr *addr) |
const struct in6_addr *ccs_get_ipv6_address(const struct in6_addr *addr) |
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{ |
{ |
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struct ccs_ipv6addr_entry *entry; |
struct ccs_ipv6addr *entry; |
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struct ccs_ipv6addr_entry *ptr; |
struct ccs_ipv6addr *ptr = NULL; |
153 |
int error = -ENOMEM; |
int error = -ENOMEM; |
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if (!addr) |
if (!addr) |
155 |
return NULL; |
return NULL; |
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entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
entry = kzalloc(sizeof(*entry), CCS_GFP_FLAGS); |
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mutex_lock(&ccs_policy_lock); |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
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list_for_each_entry(ptr, &ccs_address_list, list) { |
goto out; |
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list_for_each_entry(ptr, &ccs_shared_list[CCS_IPV6ADDRESS_LIST], |
160 |
|
head.list) { |
161 |
if (memcmp(&ptr->addr, addr, sizeof(*addr))) |
if (memcmp(&ptr->addr, addr, sizeof(*addr))) |
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continue; |
continue; |
163 |
atomic_inc(&ptr->users); |
atomic_inc(&ptr->head.users); |
164 |
error = 0; |
error = 0; |
165 |
break; |
break; |
166 |
} |
} |
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if (error && ccs_memory_ok(entry, sizeof(*entry))) { |
if (error && ccs_memory_ok(entry, sizeof(*entry))) { |
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ptr = entry; |
ptr = entry; |
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ptr->addr = *addr; |
ptr->addr = *addr; |
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atomic_set(&ptr->users, 1); |
atomic_set(&ptr->head.users, 1); |
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list_add_tail(&ptr->list, &ccs_address_list); |
list_add_tail(&ptr->head.list, |
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&ccs_shared_list[CCS_IPV6ADDRESS_LIST]); |
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entry = NULL; |
entry = NULL; |
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error = 0; |
175 |
} |
} |
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mutex_unlock(&ccs_policy_lock); |
mutex_unlock(&ccs_policy_lock); |
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out: |
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kfree(entry); |
kfree(entry); |
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return ptr ? &ptr->addr : NULL; |
return !error ? &ptr->addr : NULL; |
180 |
} |
} |
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|
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/* The list for "struct ccs_name_entry". */ |
/* The list for "struct ccs_name". */ |
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struct list_head ccs_name_list[CCS_MAX_HASH]; |
struct list_head ccs_name_list[CCS_MAX_HASH]; |
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DEFINE_MUTEX(ccs_name_list_lock); |
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/** |
/** |
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* ccs_get_name - Allocate memory for string data. |
* ccs_get_name - Allocate memory for string data. |
191 |
*/ |
*/ |
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const struct ccs_path_info *ccs_get_name(const char *name) |
const struct ccs_path_info *ccs_get_name(const char *name) |
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{ |
{ |
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struct ccs_name_entry *ptr; |
struct ccs_name *ptr; |
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unsigned int hash; |
unsigned int hash; |
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int len; |
int len; |
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int allocated_len; |
int allocated_len; |
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struct list_head *head; |
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|
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if (!name) |
if (!name) |
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return NULL; |
return NULL; |
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len = strlen(name) + 1; |
len = strlen(name) + 1; |
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hash = full_name_hash((const unsigned char *) name, len - 1); |
hash = full_name_hash((const unsigned char *) name, len - 1); |
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mutex_lock(&ccs_name_list_lock); |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0) || defined(RHEL_MAJOR) |
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list_for_each_entry(ptr, &ccs_name_list[hash % CCS_MAX_HASH], list) { |
head = &ccs_name_list[hash_long(hash, CCS_HASH_BITS)]; |
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#else |
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head = &ccs_name_list[hash % CCS_MAX_HASH]; |
208 |
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#endif |
209 |
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if (mutex_lock_interruptible(&ccs_policy_lock)) |
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return NULL; |
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list_for_each_entry(ptr, head, head.list) { |
212 |
if (hash != ptr->entry.hash || strcmp(name, ptr->entry.name)) |
if (hash != ptr->entry.hash || strcmp(name, ptr->entry.name)) |
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continue; |
continue; |
214 |
atomic_inc(&ptr->users); |
atomic_inc(&ptr->head.users); |
215 |
goto out; |
goto out; |
216 |
} |
} |
217 |
allocated_len = ccs_round2(sizeof(*ptr) + len); |
allocated_len = sizeof(*ptr) + len; |
218 |
ptr = kzalloc(allocated_len, GFP_KERNEL); |
ptr = kzalloc(allocated_len, CCS_GFP_FLAGS); |
219 |
if (!ptr || (ccs_quota_for_policy && |
if (ccs_memory_ok(ptr, allocated_len)) { |
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atomic_read(&ccs_policy_memory_size) + allocated_len |
ptr->entry.name = ((char *) ptr) + sizeof(*ptr); |
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> ccs_quota_for_policy)) { |
memmove((char *) ptr->entry.name, name, len); |
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atomic_set(&ptr->head.users, 1); |
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ccs_fill_path_info(&ptr->entry); |
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ptr->size = allocated_len; |
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list_add_tail(&ptr->head.list, head); |
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} else { |
227 |
kfree(ptr); |
kfree(ptr); |
228 |
ptr = NULL; |
ptr = NULL; |
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ccs_warn_oom(__func__); |
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goto out; |
|
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} |
} |
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atomic_add(allocated_len, &ccs_policy_memory_size); |
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ptr->entry.name = ((char *) ptr) + sizeof(*ptr); |
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memmove((char *) ptr->entry.name, name, len); |
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atomic_set(&ptr->users, 1); |
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ccs_fill_path_info(&ptr->entry); |
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ptr->size = allocated_len; |
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list_add_tail(&ptr->list, &ccs_name_list[hash % CCS_MAX_HASH]); |
|
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out: |
out: |
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mutex_unlock(&ccs_name_list_lock); |
mutex_unlock(&ccs_policy_lock); |
232 |
return ptr ? &ptr->entry : NULL; |
return ptr ? &ptr->entry : NULL; |
233 |
} |
} |
234 |
|
|
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/** |
/** |
236 |
* ccs_mm_init - Initialize mm related code. |
* ccs_mm_init - Initialize mm related code. |
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* |
|
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* Returns 0. |
|
237 |
*/ |
*/ |
238 |
static int __init ccs_mm_init(void) |
void __init ccs_mm_init(void) |
239 |
{ |
{ |
240 |
int i; |
int idx; |
241 |
for (i = 0; i < CCS_MAX_HASH; i++) |
for (idx = 0; idx < CCS_MAX_HASH; idx++) |
242 |
INIT_LIST_HEAD(&ccs_name_list[i]); |
INIT_LIST_HEAD(&ccs_name_list[idx]); |
243 |
|
INIT_LIST_HEAD(&ccs_global_domain.acl_info_list); |
244 |
INIT_LIST_HEAD(&ccs_kernel_domain.acl_info_list); |
INIT_LIST_HEAD(&ccs_kernel_domain.acl_info_list); |
245 |
ccs_kernel_domain.domainname = ccs_get_name(ROOT_NAME); |
ccs_kernel_domain.domainname = ccs_get_name(CCS_ROOT_NAME); |
246 |
list_add_tail_rcu(&ccs_kernel_domain.list, &ccs_domain_list); |
list_add_tail_rcu(&ccs_kernel_domain.list, &ccs_domain_list); |
247 |
if (ccs_find_domain(ROOT_NAME) != &ccs_kernel_domain) |
idx = ccs_read_lock(); |
248 |
|
if (ccs_find_domain(CCS_ROOT_NAME) != &ccs_kernel_domain) |
249 |
panic("Can't register ccs_kernel_domain"); |
panic("Can't register ccs_kernel_domain"); |
250 |
{ |
{ |
251 |
/* Load built-in policy. */ |
/* Load built-in policy. */ |
257 |
char *cp2 = strchr(cp, ' '); |
char *cp2 = strchr(cp, ' '); |
258 |
if (cp2) |
if (cp2) |
259 |
*cp2++ = '\0'; |
*cp2++ = '\0'; |
260 |
ccs_write_domain_initializer_policy(cp, false, false); |
ccs_write_domain_initializer(cp, false, false); |
261 |
cp = cp2; |
cp = cp2; |
262 |
} |
} |
263 |
} |
} |
264 |
return 0; |
ccs_read_unlock(idx); |
265 |
} |
} |
266 |
|
|
267 |
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0) |
/* Memory allocated for audit logs. */ |
268 |
__initcall(ccs_mm_init); |
unsigned int ccs_log_memory_size; |
269 |
#else |
/* Quota for holding audit logs. */ |
270 |
core_initcall(ccs_mm_init); |
unsigned int ccs_quota_for_log; |
|
#endif |
|
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unsigned int ccs_audit_log_memory_size; |
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unsigned int ccs_quota_for_audit_log; |
|
271 |
|
|
272 |
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/* Memory allocated for query lists. */ |
273 |
unsigned int ccs_query_memory_size; |
unsigned int ccs_query_memory_size; |
274 |
|
/* Quota for holding query lists. */ |
275 |
unsigned int ccs_quota_for_query; |
unsigned int ccs_quota_for_query; |
276 |
|
|
277 |
/** |
/** |
283 |
{ |
{ |
284 |
const unsigned int usage[3] = { |
const unsigned int usage[3] = { |
285 |
atomic_read(&ccs_policy_memory_size), |
atomic_read(&ccs_policy_memory_size), |
286 |
ccs_audit_log_memory_size, |
ccs_log_memory_size, |
287 |
ccs_query_memory_size |
ccs_query_memory_size |
288 |
}; |
}; |
289 |
const unsigned int quota[3] = { |
const unsigned int quota[3] = { |
290 |
ccs_quota_for_policy, |
ccs_quota_for_policy, |
291 |
ccs_quota_for_audit_log, |
ccs_quota_for_log, |
292 |
ccs_quota_for_query |
ccs_quota_for_query |
293 |
}; |
}; |
294 |
static const char *header[4] = { |
static const char *header[4] = { |
326 |
if (sscanf(data, "Policy: %u", &size) == 1) |
if (sscanf(data, "Policy: %u", &size) == 1) |
327 |
ccs_quota_for_policy = size; |
ccs_quota_for_policy = size; |
328 |
else if (sscanf(data, "Audit logs: %u", &size) == 1) |
else if (sscanf(data, "Audit logs: %u", &size) == 1) |
329 |
ccs_quota_for_audit_log = size; |
ccs_quota_for_log = size; |
330 |
else if (sscanf(data, "Query lists: %u", &size) == 1) |
else if (sscanf(data, "Query lists: %u", &size) == 1) |
331 |
ccs_quota_for_query = size; |
ccs_quota_for_query = size; |
332 |
return 0; |
return 0; |