This paper does some analysis and researches on FreeBSD and System Management Mode of CPU. It spon-sors a method to decrease FreeBSD securelevel and get the control of FreeBSD by executing special SMI Handler under SMM.

• 论文通过对FreeBSD和SMM(System Management Mode,系统管理模式)的分析与研究,提出了一种在系统管理模式下执行特定的SMI Handler,降低FreeBSD系统安全等级,从而实现对FreeBSD控制的方法。