format string attack

一直对%p和%n理解不透彻，这遍文章用代码简单表述了：

%p = (void *) x

%n = (int * ) x

http://www.qnx.com/developers/docs/6.5.0/index.jsp?topic=%2Fcom.qnx.doc.dinkum_en_c99%2Flib_prin.html

Introduction to format string exploits:

https://codearcana.com/posts/2013/05/02/introduction-to-format-string-exploits.html