CS208, Friday 4 Feb 2022

What are we ready for?

• Reverse engineering
• Security attacks (especially buffer overflow) (we'll look at recent news)
• Virtual memory
• Threads and processes
• Network programming

Environment variables

• Unix commands: echo, env
• C support: third parameter to main
• C support: getenv and secure_getenv

gdb: the GNU debugger

• GNU = GNU's Not UNIX
• gcc -Wall -Werror -g -O0 -o whatever whatever.c
• gdb commands (see this gdb mini-lab for a quick run-through)
  • run [args]
  • continue
  • break [filename:]linenum
  • list [startline,endline]
  • print variable-name
  • info reg [regname]
  • backtrace (bt)
  • next
  • step
  • x/60w address