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>

3 files changed, 14 insertions, 66 deletions

diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index 165eb5397ea5..349aabc83297 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 4a53f396d422..2f6ab5258b1e 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 b85e61bcf246..96fafc01e2c7 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);