apparmorfs: fix use-after-free on symlink traversal

symlink body shouldn't be freed without an RCU delay.  Switch apparmorfs
to ->destroy_inode() and use of call_rcu(); free both the inode and symlink
body in the callback.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 9 insertions, 4 deletions

diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c
index fefee040bf79..b9298d2e8165 100644
--- a/security/apparmor/apparmorfs.c
+++ b/security/apparmor/apparmorfs.c
@@ -123,17 +123,22 @@ static int aafs_show_path(struct seq_file *seq, struct dentry *dentry)
         return 0;
 }
 
-static void aafs_evict_inode(struct inode *inode)
+static void aafs_i_callback(struct rcu_head *head)
 {
-        truncate_inode_pages_final(&inode->i_data);
-        clear_inode(inode);
+        struct inode *inode = container_of(head, struct inode, i_rcu);
         if (S_ISLNK(inode->i_mode))
                 kfree(inode->i_link);
+        free_inode_nonrcu(inode);
+}
+
+static void aafs_destroy_inode(struct inode *inode)
+{
+        call_rcu(&inode->i_rcu, aafs_i_callback);
 }
 
 static const struct super_operations aafs_super_ops = {
         .statfs = simple_statfs,
-        .evict_inode = aafs_evict_inode,
+        .destroy_inode = aafs_destroy_inode,
         .show_path = aafs_show_path,
 };