Andreas Kling ae2d72377d
Kernel: Enable the x86 WP bit to catch invalid memory writes in ring 0 ...
Setting this bit will cause the CPU to generate a page fault when
writing to read-only memory, even if we're executing in the kernel.
Seemingly the only change needed to make this work was to have the
inode-backed page fault handler use a temporary mapping for writing
the read-from-disk data into the newly-allocated physical page.
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