If you login as the root, the OS assumes you know what you're doing. Once you become root, everything is allowed.

这也是为什么一般情况下要以普通用户登陆，因为如果你以root账号登录，操作系统会假设你知道你究竟要做什么——一旦你成为root，所有的一切操作都是允许的。

youdao

I like that everything is allowed to be on the Internet, which is like a planet-size bookstore with, for some reason, a continent-size section for pets doing stupid things.

我喜欢因特网的一切，它像一个地球般大小的书店，但因为某种原因，里面储存了一个大洲那么多的地方供闲人胡说八道。

youdao

A good starting point is to allow only the clients you want access to the host using the allowed daemons and then deny everything to everybody else.

一个好的起点是，仅仅允许您想要访问主机的客户端使用允许的守护进程，拒绝其他所有客户端。

youdao

Some Eurocrats suggest that the philosophical gap reflects the American constitutional tradition that everything is allowed unless it is forbidden, against the Napoleonic tradition codifying what the state allows and banning everything else.

ECONOMIST: Charlemagne

He advises taking a conservative approach with a policy that says all information is banned from a Web site except that which is explicitly allowed, rather than one that allows everything except that which is explicitly banned.

CNN: Does your Web site reveal too much?

The purpose of a firewall is to establish a positive enforcement model, i.e. limit traffic between networks of different trust levels to that which is allowed and block everything else.

FORBES: Tearing away the veil of hype from Palo Alto Networks' IPO