--- a/src/java.base/share/classes/java/io/FilePermission.java	Fri Sep 27 18:27:42 2019 +0000
+++ b/src/java.base/share/classes/java/io/FilePermission.java	Fri Sep 27 17:50:09 2019 -0700
@@ -1196,7 +1196,7 @@
                 if ((effective & desired) == desired) {
                     return true;
                 }
-                needed = (desired ^ effective);
+                needed = (desired & ~effective);
             }
         }
         return false;