所有对数据的访问与修改必须通过函数调用来完成。
All access and modifications to the data should be through function calls.
注意,函数只能作为不可变的序列访问这个列表—也就是说,尝试修改列表的内容会导致错误。
Note that the function can only access the list as an immutable sequence-that is, trying to modify the contents of the list results in an error.
在访问内部对象之前对内核代码进行修改,以调用一个代表实施函数的钩子,该实施函数实现安全策略。
Kernel code is modified prior to accessing internal objects to invoke a hook that represents an enforcement function, which implements the security policy.
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