栈溢出学习（三）Chained Return2Libc
跟随教程https://sploitfun.wordpress.com/2015/
此次实验参考https://sploitfun.wordpress.com/2015/05/08/bypassing-nx-bit-using-chained-return-to-libc/
“esp lifting"和frame faking参考：http://phrack.org/issues/58/4.html
实验环境
Ubuntu12.04
QianLong Sang
Second Year CS Phd
My research interests include operating system, computer architecture and computer security.