From the viewpoint of logic security and according to the ordinary user, superuser and source coder respectively, we discuss various possible security violations on BSD 4 UNIX. Moreover, we also disclose some flaws in existing versions.

• 本文从逻辑安全角度出发,针对普通用户、超级用户和源代码编制者,主要就BSD4 UNIX讨论各种可能的安全违例,并揭示一些现有版本中存在的漏洞。