public virtual void RevertAll(ref StackCrawlMark stackMark)
        {
            FrameSecurityDescriptor secObj = GetSecurityObjectForFrame(ref stackMark, false);

            if (secObj != null)
            {
                secObj = secObj.Copy();
                secObj.RevertAll();
                SetSecurityObjectForFrame(ref stackMark, secObj);
            }
            else if (SecurityManager.SecurityEnabled)
            {
                throw new ExecutionEngineException(Environment.GetResourceString("ExecutionEngine_MissingSecurityDescriptor"));
            }
        }