Problem 5: OS Security

a) What are the two general categories of defenses against buffer overflows? What is the main difference between the two categories?

b) List and briefly describe (1-2 sentences per technique) three different defenses against buffer overflows that can be used when compiling new programs.

c) List and briefly describe (1-2 sentences per technique) three different defenses available to OS when running existing, vulnerable programs that may cause buffer overflows.