TOMOYO: Split files into some pieces.
security/tomoyo/common.c became too large to read. Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: James Morris <jmorris@namei.org>
Este commit está contenido en:
Tetsuo Handa
cometido por
James Morris
James Morris
padre
17fcfbd9d4
commit
c3ef1500ec
236
security/tomoyo/memory.c
Archivo normal
236
security/tomoyo/memory.c
Archivo normal
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/*
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* security/tomoyo/memory.c
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*
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* Memory management functions for TOMOYO.
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*
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* Copyright (C) 2005-2010 NTT DATA CORPORATION
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*/
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#include <linux/hash.h>
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#include <linux/slab.h>
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#include "common.h"
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/**
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* tomoyo_warn_oom - Print out of memory warning message.
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*
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* @function: Function's name.
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*/
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void tomoyo_warn_oom(const char *function)
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{
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/* Reduce error messages. */
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static pid_t tomoyo_last_pid;
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const pid_t pid = current->pid;
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if (tomoyo_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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tomoyo_last_pid = pid;
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}
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if (!tomoyo_policy_loaded)
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panic("MAC Initialization failed.\n");
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}
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/* Memory allocated for policy. */
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static atomic_t tomoyo_policy_memory_size;
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/* Quota for holding policy. */
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static unsigned int tomoyo_quota_for_policy;
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/**
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* tomoyo_memory_ok - Check memory quota.
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*
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* @ptr: Pointer to allocated memory.
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*
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* Returns true on success, false otherwise.
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*
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* Returns true if @ptr is not NULL and quota not exceeded, false otherwise.
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*/
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bool tomoyo_memory_ok(void *ptr)
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{
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size_t s = ptr ? ksize(ptr) : 0;
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atomic_add(s, &tomoyo_policy_memory_size);
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if (ptr && (!tomoyo_quota_for_policy ||
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atomic_read(&tomoyo_policy_memory_size)
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<= tomoyo_quota_for_policy)) {
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memset(ptr, 0, s);
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return true;
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}
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atomic_sub(s, &tomoyo_policy_memory_size);
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tomoyo_warn_oom(__func__);
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return false;
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}
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/**
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* tomoyo_commit_ok - Check memory quota.
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*
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* @data: Data to copy from.
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* @size: Size in byte.
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*
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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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*/
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void *tomoyo_commit_ok(void *data, const unsigned int size)
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{
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void *ptr = kzalloc(size, GFP_NOFS);
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if (tomoyo_memory_ok(ptr)) {
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memmove(ptr, data, size);
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memset(data, 0, size);
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return ptr;
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}
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return NULL;
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}
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/**
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* tomoyo_memory_free - Free memory for elements.
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*
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* @ptr: Pointer to allocated memory.
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*/
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void tomoyo_memory_free(void *ptr)
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{
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atomic_sub(ksize(ptr), &tomoyo_policy_memory_size);
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kfree(ptr);
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}
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/*
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* tomoyo_name_list is used for holding string data used by TOMOYO.
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* Since same string data is likely used for multiple times (e.g.
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* "/lib/libc-2.5.so"), TOMOYO shares string data in the form of
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* "const struct tomoyo_path_info *".
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*/
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struct list_head tomoyo_name_list[TOMOYO_MAX_HASH];
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/**
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* tomoyo_get_name - Allocate permanent 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 tomoyo_path_info" on success, NULL otherwise.
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*/
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const struct tomoyo_path_info *tomoyo_get_name(const char *name)
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{
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struct tomoyo_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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struct list_head *head;
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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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head = &tomoyo_name_list[hash_long(hash, TOMOYO_HASH_BITS)];
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if (mutex_lock_interruptible(&tomoyo_policy_lock))
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return NULL;
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list_for_each_entry(ptr, head, list) {
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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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ptr = kzalloc(sizeof(*ptr) + len, GFP_NOFS);
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allocated_len = ptr ? ksize(ptr) : 0;
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if (!ptr || (tomoyo_quota_for_policy &&
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atomic_read(&tomoyo_policy_memory_size) + allocated_len
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> tomoyo_quota_for_policy)) {
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kfree(ptr);
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ptr = NULL;
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tomoyo_warn_oom(__func__);
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goto out;
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}
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atomic_add(allocated_len, &tomoyo_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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tomoyo_fill_path_info(&ptr->entry);
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list_add_tail(&ptr->list, head);
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out:
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mutex_unlock(&tomoyo_policy_lock);
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return ptr ? &ptr->entry : NULL;
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}
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/**
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* tomoyo_mm_init - Initialize mm related code.
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*/
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void __init tomoyo_mm_init(void)
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{
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int idx;
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BUILD_BUG_ON(TOMOYO_MAX_PATHNAME_LEN > PATH_MAX);
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for (idx = 0; idx < TOMOYO_MAX_HASH; idx++)
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INIT_LIST_HEAD(&tomoyo_name_list[idx]);
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INIT_LIST_HEAD(&tomoyo_kernel_domain.acl_info_list);
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tomoyo_kernel_domain.domainname = tomoyo_get_name(TOMOYO_ROOT_NAME);
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list_add_tail_rcu(&tomoyo_kernel_domain.list, &tomoyo_domain_list);
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idx = tomoyo_read_lock();
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if (tomoyo_find_domain(TOMOYO_ROOT_NAME) != &tomoyo_kernel_domain)
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panic("Can't register tomoyo_kernel_domain");
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{
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/* Load built-in policy. */
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tomoyo_write_domain_initializer_policy("/sbin/hotplug",
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false, false);
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tomoyo_write_domain_initializer_policy("/sbin/modprobe",
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false, false);
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}
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tomoyo_read_unlock(idx);
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}
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/* Memory allocated for query lists. */
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unsigned int tomoyo_query_memory_size;
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/* Quota for holding query lists. */
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unsigned int tomoyo_quota_for_query;
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/**
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* tomoyo_read_memory_counter - Check for memory usage in bytes.
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*
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* @head: Pointer to "struct tomoyo_io_buffer".
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*
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* Returns memory usage.
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*/
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int tomoyo_read_memory_counter(struct tomoyo_io_buffer *head)
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{
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if (!head->read_eof) {
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const unsigned int policy
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= atomic_read(&tomoyo_policy_memory_size);
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const unsigned int query = tomoyo_query_memory_size;
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char buffer[64];
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memset(buffer, 0, sizeof(buffer));
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if (tomoyo_quota_for_policy)
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snprintf(buffer, sizeof(buffer) - 1,
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" (Quota: %10u)",
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tomoyo_quota_for_policy);
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else
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buffer[0] = '\0';
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tomoyo_io_printf(head, "Policy: %10u%s\n", policy,
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buffer);
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if (tomoyo_quota_for_query)
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snprintf(buffer, sizeof(buffer) - 1,
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" (Quota: %10u)",
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tomoyo_quota_for_query);
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else
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buffer[0] = '\0';
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tomoyo_io_printf(head, "Query lists: %10u%s\n", query,
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buffer);
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tomoyo_io_printf(head, "Total: %10u\n", policy + query);
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head->read_eof = true;
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}
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return 0;
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}
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/**
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* tomoyo_write_memory_quota - Set memory quota.
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*
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* @head: Pointer to "struct tomoyo_io_buffer".
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*
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* Returns 0.
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*/
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int tomoyo_write_memory_quota(struct tomoyo_io_buffer *head)
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{
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char *data = head->write_buf;
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unsigned int size;
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if (sscanf(data, "Policy: %u", &size) == 1)
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tomoyo_quota_for_policy = size;
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else if (sscanf(data, "Query lists: %u", &size) == 1)
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tomoyo_quota_for_query = size;
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return 0;
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}
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