Getting started.

copy the files from /fcs/courses/cs2023/tutorial4 to some directory underneath your home directory.

Valgrind and dynamic array overflow

• compile heapover.c with

  gcc -o heapover -g heapover.c

• run it.

• now run it with

  valgrind ./heapover

• finally run it with

  valgrind --db-attach=yes ./heapover

• repeat these steps with shadow.c. What do you observe about the ability of valgrind to localize uninitialized variable use, compared to illegal writes?

GCC stack protector

• compile stackover.c with

  gcc -o stackover -g stackover.c

• run it.

• now compile with

  gcc -o stackover -g -fstack-protector-all stackover.c

• run it again