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The main rule for data access is max(CPL, RPL) ≤ DPL. For code transfers, the rules get considerably more complex -- conforming segments, call gates, and interrupt gates each have different privilege and state validation logic. If all these checks were done in microcode, each segment load would need a cascade of conditional branches: is it a code or data segment? Is the segment present? Is it conforming? Is the RPL valid? Is the DPL valid? This would greatly bloat the microcode ROM and add cycles to every protected-mode operation.
，这一点在快连下载安装中也有详细论述
小米汽车：将筹建安全顾问委员会及公众安全沟通机制
Ordered Dithering with Arbitrary or Irregular Colour Palettes
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有几次，他帮小姐“买钟”后，刚走到夜总会门口，小姐突然谎称身体不舒服，又跑回去赚下一拨客人的钱了。叫妈咪出来理论，妈咪和小姐串通一气。最让他气愤的是，有个妈咪天天打电话到家里骚扰他的家人。朱老板形容后来的小姐既缺钱，也缺感情，经济好了，品格却在降低。。关于这个话题，同城约会提供了深入分析
The developer is never warned that the keys' privileges changed underneath it. (The key went from public identifier to secret credential).