Secure Buffer Management

The focus of our previous chapters was on concurrency control related issues arise in MLS DBS environment. In this chapter, we shift our attention to another important transaction processing component, namely, buffer management. Since transactions of various security clearance levels often share the buffer pool, there arise the possibility of exploiting some of the buffer management components for covert signaling. In order to ensure the security of MLS RTDBS, buffer managers should be designed to meet the non-interference [GM82] criteria.