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authorEric Paris <eparis@redhat.com>2009-12-04 15:47:52 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2009-12-16 12:16:46 -0500
commit9353384ec8128cb443463016bbabb44ca857ff52 (patch)
tree411ff22e85868aea1575d8b133187def3b0e0498 /security
parentec29ea544b1ce204ba3575ba05fccf3069d00c3f (diff)
downloadvexpress-lsk-9353384ec8128cb443463016bbabb44ca857ff52.tar.gz
ima: only insert at inode creation time
iints are supposed to be allocated when an inode is allocated (during security_inode_alloc()) But we have code which will attempt to allocate an iint during measurement calls. If we couldn't allocate the iint and we cared, we should have died during security_inode_alloc(). Not make the code more complex and less efficient. Signed-off-by: Eric Paris <eparis@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'security')
-rw-r--r--security/integrity/ima/ima.h1
-rw-r--r--security/integrity/ima/ima_iint.c71
-rw-r--r--security/integrity/ima/ima_main.c8
3 files changed, 14 insertions, 66 deletions
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index 165eb5397ea..349aabc8329 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -128,7 +128,6 @@ void ima_template_show(struct seq_file *m, void *e,
*/
struct ima_iint_cache *ima_iint_insert(struct inode *inode);
struct ima_iint_cache *ima_iint_find_get(struct inode *inode);
-struct ima_iint_cache *ima_iint_find_insert_get(struct inode *inode);
void ima_iint_delete(struct inode *inode);
void iint_free(struct kref *kref);
void iint_rcu_free(struct rcu_head *rcu);
diff --git a/security/integrity/ima/ima_iint.c b/security/integrity/ima/ima_iint.c
index 4a53f396d42..2f6ab5258b1 100644
--- a/security/integrity/ima/ima_iint.c
+++ b/security/integrity/ima/ima_iint.c
@@ -45,22 +45,21 @@ out:
return iint;
}
-/* Allocate memory for the iint associated with the inode
- * from the iint_cache slab, initialize the iint, and
- * insert it into the radix tree.
- *
- * On success return a pointer to the iint; on failure return NULL.
+/**
+ * ima_inode_alloc - allocate an iint associated with an inode
+ * @inode: pointer to the inode
*/
-struct ima_iint_cache *ima_iint_insert(struct inode *inode)
+int ima_inode_alloc(struct inode *inode)
{
struct ima_iint_cache *iint = NULL;
int rc = 0;
if (!ima_initialized)
- return iint;
+ return 0;
+
iint = kmem_cache_alloc(iint_cache, GFP_NOFS);
if (!iint)
- return iint;
+ return -ENOMEM;
rc = radix_tree_preload(GFP_NOFS);
if (rc < 0)
@@ -70,63 +69,13 @@ struct ima_iint_cache *ima_iint_insert(struct inode *inode)
rc = radix_tree_insert(&ima_iint_store, (unsigned long)inode, iint);
spin_unlock(&ima_iint_lock);
out:
- if (rc < 0) {
+ if (rc < 0)
kmem_cache_free(iint_cache, iint);
- if (rc == -EEXIST) {
- spin_lock(&ima_iint_lock);
- iint = radix_tree_lookup(&ima_iint_store,
- (unsigned long)inode);
- spin_unlock(&ima_iint_lock);
- } else
- iint = NULL;
- }
- radix_tree_preload_end();
- return iint;
-}
-
-/**
- * ima_inode_alloc - allocate an iint associated with an inode
- * @inode: pointer to the inode
- */
-int ima_inode_alloc(struct inode *inode)
-{
- struct ima_iint_cache *iint;
-
- if (!ima_initialized)
- return 0;
-
- iint = ima_iint_insert(inode);
- if (!iint)
- return -ENOMEM;
- return 0;
-}
-
-/* ima_iint_find_insert_get - get the iint associated with an inode
- *
- * Most insertions are done at inode_alloc, except those allocated
- * before late_initcall. When the iint does not exist, allocate it,
- * initialize and insert it, and increment the iint refcount.
- *
- * (Can't initialize at security_initcall before any inodes are
- * allocated, got to wait at least until proc_init.)
- *
- * Return the iint.
- */
-struct ima_iint_cache *ima_iint_find_insert_get(struct inode *inode)
-{
- struct ima_iint_cache *iint = NULL;
- iint = ima_iint_find_get(inode);
- if (iint)
- return iint;
-
- iint = ima_iint_insert(inode);
- if (iint)
- kref_get(&iint->refcount);
+ radix_tree_preload_end();
- return iint;
+ return rc;
}
-EXPORT_SYMBOL_GPL(ima_iint_find_insert_get);
/* iint_free - called when the iint refcount goes to zero */
void iint_free(struct kref *kref)
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index b85e61bcf24..96fafc01e2c 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -161,7 +161,7 @@ int ima_path_check(struct path *path, int mask, int update_counts)
if (!ima_initialized || !S_ISREG(inode->i_mode))
return 0;
- iint = ima_iint_find_insert_get(inode);
+ iint = ima_iint_find_get(inode);
if (!iint)
return 0;
@@ -219,7 +219,7 @@ static int process_measurement(struct file *file, const unsigned char *filename,
if (!ima_initialized || !S_ISREG(inode->i_mode))
return 0;
- iint = ima_iint_find_insert_get(inode);
+ iint = ima_iint_find_get(inode);
if (!iint)
return -ENOMEM;
@@ -255,7 +255,7 @@ void ima_counts_put(struct path *path, int mask)
*/
if (!ima_initialized || !inode || !S_ISREG(inode->i_mode))
return;
- iint = ima_iint_find_insert_get(inode);
+ iint = ima_iint_find_get(inode);
if (!iint)
return;
@@ -286,7 +286,7 @@ void ima_counts_get(struct file *file)
if (!ima_initialized || !S_ISREG(inode->i_mode))
return;
- iint = ima_iint_find_insert_get(inode);
+ iint = ima_iint_find_get(inode);
if (!iint)
return;
mutex_lock(&iint->mutex);