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Kernel space is flagged in the page tables as exclusive to privileged code (ring 2 or lower), hence a page fault is triggered if user-mode programs try to touch it.
系统内核所使用的内存空间通过特权码（privileged code，2级或者更低）来标记，以防止用户模式的程序访问到内核空间而发生页面错误。
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Coders are part of a "privileged class in our society right now, " says Jennifer Pahlka, the founder of San Francisco-based Code for America.
WSJ: Beyond the Three R's: Push to Teach Coding at School
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