ovl: ignore permissions on underlying lookup

Generally permission checking is not necessary when overlayfs looks up a
dentry on one of the underlying layers, since search permission on base
directory was already checked in ovl_permission().

More specifically using lookup_one_len() causes a problem when the lower
directory lacks search permission for a specific user while the upper
directory does have search permission.  Since lookups are cached, this
causes inconsistency in behavior: success depends on who did the first
lookup.

So instead use lookup_hash() which doesn't do the permission check.

Reported-by: Ignacy Gawędzki <ignacy.gawedzki@green-communications.fr>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

fs/overlayfs/super.c

diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index 5d972e6..791235e 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -411,9 +411,7 @@
 {
 	struct dentry *dentry;
 
-	inode_lock(dir->d_inode);
-	dentry = lookup_one_len(name->name, dir, name->len);
-	inode_unlock(dir->d_inode);
+	dentry = lookup_hash(name, dir);
 
 	if (IS_ERR(dentry)) {
 		if (PTR_ERR(dentry) == -ENOENT)