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kumaneko |
2864 |
/* |
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kumaneko |
3033 |
* security/ccsecurity/memory.c |
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kumaneko |
2864 |
* |
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kumaneko |
3502 |
* Copyright (C) 2005-2010 NTT DATA CORPORATION |
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kumaneko |
2864 |
* |
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kumaneko |
3561 |
* Version: 1.7.2 2010/04/01 |
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kumaneko |
2864 |
* |
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* This file is applicable to both 2.4.30 and 2.6.11 and later. |
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* See README.ccs for ChangeLog. |
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* |
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*/ |
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#include "internal.h" |
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kumaneko |
3146 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0) || defined(RHEL_MAJOR) |
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#include <linux/hash.h> |
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#endif |
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kumaneko |
2864 |
|
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kumaneko |
2932 |
void ccs_warn_oom(const char *function) |
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kumaneko |
2908 |
{ |
20 |
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/* Reduce error messages. */ |
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static pid_t ccs_last_pid; |
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const pid_t pid = current->pid; |
23 |
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if (ccs_last_pid != pid) { |
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printk(KERN_WARNING "ERROR: Out of memory at %s.\n", |
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function); |
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ccs_last_pid = pid; |
27 |
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} |
28 |
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if (!ccs_policy_loaded) |
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panic("MAC Initialization failed.\n"); |
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} |
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kumaneko |
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static atomic_t ccs_policy_memory_size; |
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static unsigned int ccs_quota_for_policy; |
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kumaneko |
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|
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/** |
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* ccs_memory_ok - Check memory quota. |
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* |
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* @ptr: Pointer to allocated memory. |
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* @size: Size in byte. |
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* |
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kumaneko |
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* Returns true if @ptr is not NULL and quota not exceeded, false otherwise. |
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kumaneko |
2864 |
*/ |
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bool ccs_memory_ok(const void *ptr, const unsigned int size) |
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{ |
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kumaneko |
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size_t s = ccs_round2(size); |
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kumaneko |
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atomic_add(s, &ccs_policy_memory_size); |
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if (ptr && (!ccs_quota_for_policy || |
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atomic_read(&ccs_policy_memory_size) |
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<= ccs_quota_for_policy)) |
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kumaneko |
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return true; |
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kumaneko |
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atomic_sub(s, &ccs_policy_memory_size); |
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kumaneko |
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ccs_warn_oom(__func__); |
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kumaneko |
2864 |
return false; |
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} |
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/** |
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kumaneko |
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* ccs_commit_ok - Allocate memory and check memory quota. |
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kumaneko |
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* |
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kumaneko |
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* @data: Data to copy from. |
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* @size: Size in byte. |
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kumaneko |
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* |
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kumaneko |
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* Returns pointer to allocated memory on success, NULL otherwise. |
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* @data is zero-cleared on success. |
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kumaneko |
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*/ |
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kumaneko |
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void *ccs_commit_ok(void *data, const unsigned int size) |
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kumaneko |
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{ |
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kumaneko |
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void *ptr = kmalloc(size, CCS_GFP_FLAGS); |
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if (!ptr) |
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return NULL; |
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kumaneko |
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if (ccs_memory_ok(ptr, size)) { |
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memmove(ptr, data, size); |
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memset(data, 0, size); |
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kumaneko |
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return ptr; |
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kumaneko |
2864 |
} |
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kumaneko |
3512 |
kfree(ptr); |
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return NULL; |
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kumaneko |
2864 |
} |
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/** |
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kumaneko |
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* ccs_memory_free - Free memory for elements. |
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kumaneko |
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* |
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kumaneko |
2900 |
* @ptr: Pointer to allocated memory. |
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* @size: Size in byte. |
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kumaneko |
2864 |
*/ |
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kumaneko |
2900 |
void ccs_memory_free(const void *ptr, size_t size) |
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kumaneko |
2864 |
{ |
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kumaneko |
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atomic_sub(ccs_round2(size), &ccs_policy_memory_size); |
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kumaneko |
2900 |
kfree(ptr); |
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kumaneko |
2864 |
} |
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kumaneko |
3131 |
LIST_HEAD(ccs_address_list); |
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kumaneko |
2864 |
|
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/** |
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* ccs_get_ipv6_address - Keep the given IPv6 address on the RAM. |
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* |
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* @addr: Pointer to "struct in6_addr". |
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* |
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* Returns pointer to "struct in6_addr" on success, NULL otherwise. |
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* |
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* The RAM is shared, so NEVER try to modify or kfree() the returned address. |
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*/ |
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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; |
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kumaneko |
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struct ccs_ipv6addr_entry *ptr = NULL; |
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kumaneko |
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int error = -ENOMEM; |
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if (!addr) |
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return NULL; |
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kumaneko |
3512 |
entry = kzalloc(sizeof(*entry), CCS_GFP_FLAGS); |
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kumaneko |
3534 |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
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goto out; |
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kumaneko |
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list_for_each_entry(ptr, &ccs_address_list, list) { |
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if (memcmp(&ptr->addr, addr, sizeof(*addr))) |
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continue; |
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atomic_inc(&ptr->users); |
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error = 0; |
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break; |
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} |
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if (error && ccs_memory_ok(entry, sizeof(*entry))) { |
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ptr = entry; |
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ptr->addr = *addr; |
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atomic_set(&ptr->users, 1); |
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list_add_tail(&ptr->list, &ccs_address_list); |
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entry = NULL; |
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kumaneko |
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error = 0; |
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kumaneko |
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} |
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mutex_unlock(&ccs_policy_lock); |
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kumaneko |
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out: |
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kumaneko |
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kfree(entry); |
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kumaneko |
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return !error ? &ptr->addr : NULL; |
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kumaneko |
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} |
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/* The list for "struct ccs_name_entry". */ |
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kumaneko |
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struct list_head ccs_name_list[CCS_MAX_HASH]; |
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kumaneko |
2864 |
|
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/** |
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* ccs_get_name - Allocate memory for string data. |
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* |
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* @name: The string to store into the permernent memory. |
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* |
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* Returns pointer to "struct ccs_path_info" on success, NULL otherwise. |
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*/ |
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const struct ccs_path_info *ccs_get_name(const char *name) |
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{ |
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struct ccs_name_entry *ptr; |
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unsigned int hash; |
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int len; |
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int allocated_len; |
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kumaneko |
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struct list_head *head; |
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kumaneko |
2864 |
|
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if (!name) |
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return NULL; |
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len = strlen(name) + 1; |
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hash = full_name_hash((const unsigned char *) name, len - 1); |
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kumaneko |
3146 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0) || defined(RHEL_MAJOR) |
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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]; |
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#endif |
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kumaneko |
3534 |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
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return NULL; |
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kumaneko |
3146 |
list_for_each_entry(ptr, head, list) { |
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kumaneko |
2864 |
if (hash != ptr->entry.hash || strcmp(name, ptr->entry.name)) |
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continue; |
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atomic_inc(&ptr->users); |
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goto out; |
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} |
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kumaneko |
2900 |
allocated_len = ccs_round2(sizeof(*ptr) + len); |
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kumaneko |
3512 |
ptr = kzalloc(allocated_len, CCS_GFP_FLAGS); |
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kumaneko |
2903 |
if (!ptr || (ccs_quota_for_policy && |
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atomic_read(&ccs_policy_memory_size) + allocated_len |
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> ccs_quota_for_policy)) { |
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kumaneko |
2864 |
kfree(ptr); |
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ptr = NULL; |
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kumaneko |
2908 |
ccs_warn_oom(__func__); |
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kumaneko |
2864 |
goto out; |
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} |
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kumaneko |
2903 |
atomic_add(allocated_len, &ccs_policy_memory_size); |
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kumaneko |
2864 |
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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kumaneko |
3146 |
list_add_tail(&ptr->list, head); |
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kumaneko |
2864 |
out: |
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kumaneko |
3519 |
mutex_unlock(&ccs_policy_lock); |
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kumaneko |
2864 |
return ptr ? &ptr->entry : NULL; |
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} |
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/** |
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kumaneko |
3078 |
* ccs_mm_init - Initialize mm related code. |
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kumaneko |
2864 |
*/ |
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kumaneko |
3502 |
void __init ccs_mm_init(void) |
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kumaneko |
2864 |
{ |
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kumaneko |
3535 |
int idx; |
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for (idx = 0; idx < CCS_MAX_HASH; idx++) |
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INIT_LIST_HEAD(&ccs_name_list[idx]); |
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kumaneko |
2864 |
INIT_LIST_HEAD(&ccs_kernel_domain.acl_info_list); |
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ccs_kernel_domain.domainname = ccs_get_name(ROOT_NAME); |
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list_add_tail_rcu(&ccs_kernel_domain.list, &ccs_domain_list); |
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kumaneko |
3535 |
idx = ccs_read_lock(); |
203 |
kumaneko |
2864 |
if (ccs_find_domain(ROOT_NAME) != &ccs_kernel_domain) |
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panic("Can't register ccs_kernel_domain"); |
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{ |
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/* Load built-in policy. */ |
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static char ccs_builtin_initializers[] __initdata |
208 |
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= CONFIG_CCSECURITY_BUILTIN_INITIALIZERS; |
209 |
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char *cp = ccs_builtin_initializers; |
210 |
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ccs_normalize_line(cp); |
211 |
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while (cp && *cp) { |
212 |
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char *cp2 = strchr(cp, ' '); |
213 |
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if (cp2) |
214 |
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*cp2++ = '\0'; |
215 |
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ccs_write_domain_initializer_policy(cp, false, false); |
216 |
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cp = cp2; |
217 |
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} |
218 |
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} |
219 |
kumaneko |
3535 |
ccs_read_unlock(idx); |
220 |
kumaneko |
2864 |
} |
221 |
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222 |
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unsigned int ccs_audit_log_memory_size; |
223 |
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unsigned int ccs_quota_for_audit_log; |
224 |
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225 |
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unsigned int ccs_query_memory_size; |
226 |
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unsigned int ccs_quota_for_query; |
227 |
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228 |
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/** |
229 |
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* ccs_read_memory_counter - Check for memory usage. |
230 |
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* |
231 |
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* @head: Pointer to "struct ccs_io_buffer". |
232 |
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*/ |
233 |
kumaneko |
2943 |
void ccs_read_memory_counter(struct ccs_io_buffer *head) |
234 |
kumaneko |
2864 |
{ |
235 |
kumaneko |
2943 |
const unsigned int usage[3] = { |
236 |
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atomic_read(&ccs_policy_memory_size), |
237 |
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ccs_audit_log_memory_size, |
238 |
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ccs_query_memory_size |
239 |
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}; |
240 |
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const unsigned int quota[3] = { |
241 |
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ccs_quota_for_policy, |
242 |
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ccs_quota_for_audit_log, |
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ccs_quota_for_query |
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}; |
245 |
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static const char *header[4] = { |
246 |
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"Policy: ", |
247 |
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"Audit logs: ", |
248 |
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"Query lists:", |
249 |
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"Total: " |
250 |
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}; |
251 |
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unsigned int total = 0; |
252 |
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int i; |
253 |
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if (head->read_eof) |
254 |
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return; |
255 |
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for (i = 0; i < 3; i++) { |
256 |
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total += usage[i]; |
257 |
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ccs_io_printf(head, "%s %10u", header[i], usage[i]); |
258 |
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if (quota[i]) |
259 |
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ccs_io_printf(head, " (Quota: %10u)", quota[i]); |
260 |
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ccs_io_printf(head, "\n"); |
261 |
kumaneko |
2864 |
} |
262 |
kumaneko |
2943 |
ccs_io_printf(head, "%s %10u\n", header[3], total); |
263 |
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head->read_eof = true; |
264 |
kumaneko |
2864 |
} |
265 |
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266 |
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/** |
267 |
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* ccs_write_memory_quota - Set memory quota. |
268 |
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* |
269 |
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* @head: Pointer to "struct ccs_io_buffer". |
270 |
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* |
271 |
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* Returns 0. |
272 |
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*/ |
273 |
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int ccs_write_memory_quota(struct ccs_io_buffer *head) |
274 |
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{ |
275 |
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char *data = head->write_buf; |
276 |
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unsigned int size; |
277 |
kumaneko |
2903 |
if (sscanf(data, "Policy: %u", &size) == 1) |
278 |
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ccs_quota_for_policy = size; |
279 |
kumaneko |
2864 |
else if (sscanf(data, "Audit logs: %u", &size) == 1) |
280 |
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ccs_quota_for_audit_log = size; |
281 |
kumaneko |
2903 |
else if (sscanf(data, "Query lists: %u", &size) == 1) |
282 |
kumaneko |
2864 |
ccs_quota_for_query = size; |
283 |
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return 0; |
284 |
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} |