Exploits vuln_slow into writing a message of your choice into root_file.
Check permissions of vuln_slow :
$ ls -la vuln_slow
Trace location of debug file :
$ sudo strace -e trace=open,close,read,write ./vuln_slow 60 hello
Verify write to debug file :
$ cat /home/student/.debug_log
To run
Terminal 1 :
$ ./vuln_slow 60 world
$ cat /home/student/.debug_log
Terminal 2 :
$ vulnSlowAttack.sh