Virtual-Box

Start "Linux Hacking"   password is "test"

The programs are under 

  cu$> test/app-material/progs




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to switch off address randomization

echo 0 | sudo tee /proc/sys/kernel/randomize_va_space



C0.c

add to string 
 
  " \x15\xcd\x5b\x07"

to get

  foo("my string is too long !!!!! \x15\xcd\x5b\x07");