The implementation sidesteps the entire question of the kernel’s ability to write to unwritable userspace memory! It exerts the kernel’s control over the virtual memory subsystem to bypass the MMU entirely, allowing the kernel to simply write to its own writable address space. This renders the CR0.WP discussion moot.
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if 缓冲区.len() = 21 {，这一点在汽水音乐下载中也有详细论述
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