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/*
* Copyright (C) 2008 IBM Corporation
*
* Authors:
* Mimi Zohar <zohar@us.ibm.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, version 2 of the
* License.
*
* File: integrity_iint.c
* - implements the integrity hooks: integrity_inode_alloc,
* integrity_inode_free
* - cache integrity information associated with an inode
* using a rbtree tree.
*/
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/rbtree.h>
#include "integrity.h"
static struct rb_root integrity_iint_tree = RB_ROOT;
static DEFINE_RWLOCK(integrity_iint_lock);
static struct kmem_cache *iint_cache __read_mostly;
int iint_initialized;
/*
* __integrity_iint_find - return the iint associated with an inode
*/
static struct integrity_iint_cache *__integrity_iint_find(struct inode *inode)
{
struct integrity_iint_cache *iint;
struct rb_node *n = integrity_iint_tree.rb_node;
while (n) {
iint = rb_entry(n, struct integrity_iint_cache, rb_node);
if (inode < iint->inode)
n = n->rb_left;
else if (inode > iint->inode)
n = n->rb_right;
else
break;
}
if (!n)
return NULL;
return iint;
}
/*
* integrity_iint_find - return the iint associated with an inode
*/
struct integrity_iint_cache *integrity_iint_find(struct inode *inode)
{
struct integrity_iint_cache *iint;
if (!IS_IMA(inode))
return NULL;
read_lock(&integrity_iint_lock);
iint = __integrity_iint_find(inode);
read_unlock(&integrity_iint_lock);
return iint;
}
static void iint_free(struct integrity_iint_cache *iint)
{
iint->version = 0;
iint->flags = 0UL;
iint->ima_status = INTEGRITY_UNKNOWN;
iint->evm_status = INTEGRITY_UNKNOWN;
kmem_cache_free(iint_cache, iint);
}
/**
* integrity_inode_get - find or allocate an iint associated with an inode
* @inode: pointer to the inode
* @return: allocated iint
*
* Caller must lock i_mutex
*/
struct integrity_iint_cache *integrity_inode_get(struct inode *inode)
{
struct rb_node **p;
struct rb_node *node, *parent = NULL;
struct integrity_iint_cache *iint, *test_iint;
iint = integrity_iint_find(inode);
if (iint)
return iint;
iint = kmem_cache_alloc(iint_cache, GFP_NOFS);
if (!iint)
return NULL;
write_lock(&integrity_iint_lock);
p = &integrity_iint_tree.rb_node;
while (*p) {
parent = *p;
test_iint = rb_entry(parent, struct integrity_iint_cache,
rb_node);
if (inode < test_iint->inode)
p = &(*p)->rb_left;
else
p = &(*p)->rb_right;
}
iint->inode = inode;
node = &iint->rb_node;
inode->i_flags |= S_IMA;
rb_link_node(node, parent, p);
rb_insert_color(node, &integrity_iint_tree);
write_unlock(&integrity_iint_lock);
return iint;
}
/**
* integrity_inode_free - called on security_inode_free
* @inode: pointer to the inode
*
* Free the integrity information(iint) associated with an inode.
*/
void integrity_inode_free(struct inode *inode)
{
struct integrity_iint_cache *iint;
if (!IS_IMA(inode))
return;
write_lock(&integrity_iint_lock);
iint = __integrity_iint_find(inode);
rb_erase(&iint->rb_node, &integrity_iint_tree);
write_unlock(&integrity_iint_lock);
iint_free(iint);
}
static void init_once(void *foo)
{
struct integrity_iint_cache *iint = foo;
memset(iint, 0, sizeof *iint);
iint->version = 0;
iint->flags = 0UL;
iint->ima_status = INTEGRITY_UNKNOWN;
iint->evm_status = INTEGRITY_UNKNOWN;
}
static int __init integrity_iintcache_init(void)
{
iint_cache =
kmem_cache_create("iint_cache", sizeof(struct integrity_iint_cache),
0, SLAB_PANIC, init_once);
iint_initialized = 1;
return 0;
}
security_initcall(integrity_iintcache_init);
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