Buffer
Overflow Intro. ©2002, Jedidiah R. Crandall, Susan L. Gerhart, Jan G.
Hogle.
http://sfsecurity.pr.erau.edu
Programs
use addresses for commonly used orders and to change order of actions
Norman can only read an
instruction from one mailbox, execute it, and then move
onto the next mailbox. But
sometimes the program wants him to jump to a new
address, in which case the program gives
him a pointer to the next instruction he should execute (instead of just the one in the next
mailbox).
•The pointer is just a number
which is the address of another mailbox.
•The program counter
is the number that the mailroom worker has to remember in order to remember what mailbox’s instruction
he is executing at any moment.