2bb930abcf
Between checkpatch changes (eg. sizeof) and inconsistencies between Lindent and checkpatch, unfixed checkpatch errors make it difficult to see new errors. This patch fixes them. Some lines with over 80 chars remained unchanged to improve code readability. The "extern" keyword is removed from internal evm.h to make it consistent with internal ima.h. Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com> Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
173 lines
4 KiB
C
173 lines
4 KiB
C
/*
|
|
* 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)
|
|
{
|
|
kfree(iint->ima_hash);
|
|
iint->ima_hash = NULL;
|
|
iint->version = 0;
|
|
iint->flags = 0UL;
|
|
iint->ima_file_status = INTEGRITY_UNKNOWN;
|
|
iint->ima_mmap_status = INTEGRITY_UNKNOWN;
|
|
iint->ima_bprm_status = INTEGRITY_UNKNOWN;
|
|
iint->ima_module_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_file_status = INTEGRITY_UNKNOWN;
|
|
iint->ima_mmap_status = INTEGRITY_UNKNOWN;
|
|
iint->ima_bprm_status = INTEGRITY_UNKNOWN;
|
|
iint->ima_module_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);
|