[PATCH 05/22] audit: Fix sleep in atomic

[Jan Kara <jack@suse.cz>]

Audit tree code was happily adding new notification marks while holding
spinlocks. Since fsnotify_add_mark() acquires group->mark_mutex this can
lead to sleeping while holding a spinlock, deadlocks due to lock
inversion, and probably other fun. Fix the problem by acquiring
group->mark_mutex earlier.

CC: Paul Moore <paul@paul-moore.com>
Signed-off-by: Jan Kara <jack@suse.cz>
---
 kernel/audit_tree.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c
index f3130eb0a4bd..156b6a93f4fc 100644
--- a/kernel/audit_tree.c
+++ b/kernel/audit_tree.c
@@ -231,6 +231,7 @@ static void untag_chunk(struct node *p)
 	if (size)
 		new = alloc_chunk(size);
 
+	mutex_lock(&entry->group->mark_mutex);
 	spin_lock(&entry->lock);
 	if (chunk->dead || !entry->inode) {
 		spin_unlock(&entry->lock);
@@ -258,7 +259,8 @@ static void untag_chunk(struct node *p)
 	if (!new)
 		goto Fallback;
 
-	if (fsnotify_add_mark(&new->mark, entry->group, entry->inode, NULL, 1)) {
+	if (fsnotify_add_mark_locked(&new->mark, entry->group, entry->inode,
+				     NULL, 1)) {
 		fsnotify_put_mark(&new->mark);
 		goto Fallback;
 	}
@@ -309,6 +311,7 @@ static void untag_chunk(struct node *p)
 	spin_unlock(&hash_lock);
 	spin_unlock(&entry->lock);
 out:
+	mutex_unlock(&entry->group->mark_mutex);
 	fsnotify_put_mark(entry);
 	spin_lock(&hash_lock);
 }
@@ -385,17 +388,21 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree)
 
 	chunk_entry = &chunk->mark;
 
+	mutex_lock(&old_entry->group->mark_mutex);
 	spin_lock(&old_entry->lock);
 	if (!old_entry->inode) {
 		/* old_entry is being shot, lets just lie */
 		spin_unlock(&old_entry->lock);
+		mutex_unlock(&old_entry->group->mark_mutex);
 		fsnotify_put_mark(old_entry);
 		free_chunk(chunk);
 		return -ENOENT;
 	}
 
-	if (fsnotify_add_mark(chunk_entry, old_entry->group, old_entry->inode, NULL, 1)) {
+	if (fsnotify_add_mark_locked(chunk_entry, old_entry->group,
+				     old_entry->inode, NULL, 1)) {
 		spin_unlock(&old_entry->lock);
+		mutex_unlock(&old_entry->group->mark_mutex);
 		fsnotify_put_mark(chunk_entry);
 		fsnotify_put_mark(old_entry);
 		return -ENOSPC;
@@ -411,6 +418,7 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree)
 		chunk->dead = 1;
 		spin_unlock(&chunk_entry->lock);
 		spin_unlock(&old_entry->lock);
+		mutex_unlock(&old_entry->group->mark_mutex);
 
 		fsnotify_destroy_mark(chunk_entry, audit_tree_group);
 
@@ -443,6 +451,7 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree)
 	spin_unlock(&hash_lock);
 	spin_unlock(&chunk_entry->lock);
 	spin_unlock(&old_entry->lock);
+	mutex_unlock(&old_entry->group->mark_mutex);
 	fsnotify_destroy_mark(old_entry, audit_tree_group);
 	fsnotify_put_mark(chunk_entry);	/* drop initial reference */
 	fsnotify_put_mark(old_entry); /* pair to fsnotify_find mark_entry */
-- 
2.10.2