Thank you very much~~~

the doc I found:
http://www.cs.virginia.edu/~jcg8f/GrsecuritySELinuxCaseStudy.pdf
and the HTML version of it(google convertion):
http://66.102.7.104/search?q=cache:ze7otXcttGwJ:www.cs.virginia.edu/~jcg8f/GrsecuritySELinuxCaseStudy.pdf+SELinux+and+grsecurity:+A+Case+Study+Comparing+Linux+Security&hl=zh-CN%20target=_blank