The Security Problem(安全问题) ° Security must consider external environment of the system, and protect it fror om:(安全必须考虑系统的外环境,以下方面防护:) unauthorized access.(未授权访问) malicious modification or destruction(恶意的修改和破坏) accidental introduction of inconsistency.(意外的引入和不 致) Easier to protect against accidental than malicious misuse.(s] 止意外的误用比防止恶意的误用更加容易) Applied Operating System Concepts 192 Silberschatz, Galvin, and Gagne @199919.2 Silberschatz, Galvin, and Gagne ©1999 Applied Operating System Concepts The Security Problem（安全问题） • Security must consider external environment of the system, and protect it from:（安全必须考虑系统的外环境，以下方面防护：） – unauthorized access.（未授权访问） – malicious modification or destruction（恶意的修改和破坏） – accidental introduction of inconsistency.（意外的引入和不一 致） • Easier to protect against accidental than malicious misuse.（防 止意外的误用比防止恶意的误用更加容易）