FAILED: patch "[PATCH] ovl: filter of trusted xattr results in audit" failed to apply to 3.18-stable tree

The patch below does not apply to the 3.18-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 5c2e9f346b815841f9bed6029ebcb06415caf640 Mon Sep 17 00:00:00 2001
From: Mark Salyzyn <[email protected]>
Date: Thu, 29 Aug 2019 11:30:14 -0700
Subject: [PATCH] ovl: filter of trusted xattr results in audit

When filtering xattr list for reading, presence of trusted xattr results in a security audit log. However, if there is other content no errno will be set, and if there isn't, the errno will be -ENODATA and not -EPERM as is usually associated with a lack of capability. The check does not block the request to list the xattrs present.

Switch to ns_capable_noaudit to reflect a more appropriate check.

index 7663aeb85fa3..bc14781886bf 100644
@@ -383,7 +383,8 @@ static bool ovl_can_list(const char *s)
 		return true;
 
 	/* Never list trusted.overlay, list other trusted for superuser only */
-	return !ovl_is_private_xattr(s) && capable(CAP_SYS_ADMIN);
+	return !ovl_is_private_xattr(s) &&
+	       ns_capable_noaudit(&init_user_ns, CAP_SYS_ADMIN);
 }
 
 ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size)