Lec 4: Operating System Security

In this chapter learn about operating system security. First the concept of a protection defines that the system component that enforces the access control in an operations system. A protection system consists of a protection state which describes the operations that are permitted in a system protection state operations which describe how the protection state may be changed. from this, we can determine the operations that individual processes perform

second, we identify that the today commercial operating system use protection systems that fail so truly enforce security goals. we defined a mandatory protection system which will enforce security in the face of attack

third, we outline the architecture of an access enforcement mechanism that would be implemented by a protection system. Such enforcement mechanisms can enforce a mandatory protection state correctly if they satisfy the guarantee required of the reference monitoring concept

Finally, we defined requirements for a secure operating system based on a reference monitor and mandatory protection style.