Astronomers track near-Earth objects in space because understanding their paths helps scientists assess potential hazards to Earth. A crash on the moon would not have threatened people. In fact, lunar debris would almost certainly have stayed near the moon, and the impact would not be severe enough to change the moon's orbit. But it would have offered a rare chance to learn from a known asteroid hitting another planetary surface.
However, CR0.WP is enabled at boot, and generally remains set for the life of a system. In this case, a page fault will be triggered in response to the write. As more of a tool to facilitate Copy-on-Write than a security boundary, this does not present any real restriction upon the kernel. That said, it does require the inconvenience of fault handling, which would not otherwise be necessary.
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