摘要: In a configurable system, operating systems and applications are composed dynamically from executable modules. Since dyneimically downloaded modules may not be entirely trusted, the system must able to restrict their access rights. Current assign permissions based on executor, provider, and/or name. such serve specific purposes in programs (i.e., services or applications), it should possible rights program for which they used current state of that program. this paper, we examine control infrastructure required support composition Access consists primarily two functions: policy specification enforcement policy. We survey representations mechanisms show flexibility provide limits. then how Lava Security Architecture is designed flexible enforcement.