Protection(保护) Operating system consists of a collection of objects, hardware or software(操作系统由一组对象、硬件或者软件构成) Each object has a unique name and can be accessed through a well-defined set of operations.(每个对象都具有唯一的名称,并 且可以通过一组良好定义的操作访问) Protection problem -ensure that each object is accessed correctly and only by those processes that are allowed to do so (保护问题——确认每个对象均被正确的访问、并且只被那些得 到授权的进程访问) Applied Operating System Concepts Silberschatz, Galvin, and Gagne @199918.2 Silberschatz, Galvin, and Gagne ©1999 Applied Operating System Concepts Protection（保护） • Operating system consists of a collection of objects, hardware or software（操作系统由一组对象、硬件或者软件构成） • Each object has a unique name and can be accessed through a well-defined set of operations.（每个对象都具有唯一的名称，并 且可以通过一组良好定义的操作访问） • Protection problem - ensure that each object is accessed correctly and only by those processes that are allowed to do so. （保护问题——确认每个对象均被正确的访问、并且只被那些得 到授权的进程访问）