IMA: explicit IMA i_flag to remove global lock on inode_delete

Currently for every removed inode IMA must take a global lock and search the IMA rbtree looking for an associated integrity structure. Instead we explicitly mark an inode when we add an integrity structure so we only have to take the global lock and do the removal if it exists. Signed-off-by: Eric Paris <[email protected]> Acked-by: Mimi Zohar <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
kev009 · Oct 26, 2010 · 196f518 · 196f518
1 parent 64c62f0
commit 196f518
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Showing 3 changed files with 14 additions and 5 deletions.
diff --git a/include/linux/fs.h b/include/linux/fs.h
@@ -235,6 +235,7 @@ struct inodes_stat_t {
 #define S_NOCMTIME	128	/* Do not update file c/mtime */
 #define S_SWAPFILE	256	/* Do not truncate: swapon got its bmaps */
 #define S_PRIVATE	512	/* Inode is fs-internal */
+#define S_IMA		1024	/* Inode has an associated IMA struct */
 
 /*
  * Note that nosuid etc flags are inode-specific: setting some file-system
@@ -269,6 +270,7 @@ struct inodes_stat_t {
 #define IS_NOCMTIME(inode)	((inode)->i_flags & S_NOCMTIME)
 #define IS_SWAPFILE(inode)	((inode)->i_flags & S_SWAPFILE)
 #define IS_PRIVATE(inode)	((inode)->i_flags & S_PRIVATE)
+#define IS_IMA(inode)		((inode)->i_flags & S_IMA)
 
 /* the read-only stuff doesn't really belong here, but any other place is
    probably as bad and I don't want to create yet another include file. */

diff --git a/security/integrity/ima/ima_iint.c b/security/integrity/ima/ima_iint.c
@@ -59,6 +59,9 @@ struct ima_iint_cache *ima_iint_find(struct inode *inode)
 {
 	struct ima_iint_cache *iint;
 
+	if (!IS_IMA(inode))
+		return NULL;
+
 	spin_lock(&ima_iint_lock);
 	iint = __ima_iint_find(inode);
 	spin_unlock(&ima_iint_lock);
@@ -91,6 +94,7 @@ int ima_inode_alloc(struct inode *inode)
 	new_iint->inode = inode;
 	new_node = &new_iint->rb_node;
 
+	mutex_lock(&inode->i_mutex); /* i_flags */
 	spin_lock(&ima_iint_lock);
 
 	p = &ima_iint_tree.rb_node;
@@ -107,14 +111,17 @@ int ima_inode_alloc(struct inode *inode)
 			goto out_err;
 	}
 
+	inode->i_flags |= S_IMA;
 	rb_link_node(new_node, parent, p);
 	rb_insert_color(new_node, &ima_iint_tree);
 
 	spin_unlock(&ima_iint_lock);
+	mutex_unlock(&inode->i_mutex); /* i_flags */
 
 	return 0;
 out_err:
 	spin_unlock(&ima_iint_lock);
+	mutex_unlock(&inode->i_mutex); /* i_flags */
 	iint_free(new_iint);
 
 	return rc;
@@ -135,15 +142,14 @@ void ima_inode_free(struct inode *inode)
 
 	inode->i_readcount = 0;
 
+	if (!IS_IMA(inode))
+		return;
+
 	spin_lock(&ima_iint_lock);
 	iint = __ima_iint_find(inode);
-	if (iint)
-		rb_erase(&iint->rb_node, &ima_iint_tree);
+	rb_erase(&iint->rb_node, &ima_iint_tree);
 	spin_unlock(&ima_iint_lock);
 
-	if (!iint)
-		return;
-
 	iint_free(iint);
 }
 

diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
@@ -211,6 +211,7 @@ void ima_file_free(struct file *file)
 
 	if (!iint_initialized || !S_ISREG(inode->i_mode))
 		return;
+
 	iint = ima_iint_find(inode);
 
 	if (iint)
-Original file line number
+Diff line change
@@ Expand Up / @@ -211,6 +211,7 @@ void ima_file_free(struct file *file) @@
     	if (!iint_initialized || !S_ISREG(inode->i_mode))
     		return;
     	iint = ima_iint_find(inode);
     	if (iint)
@@ Expand Down @@