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Presumably there's still some portion of the graphics driver that has to live in the kernel, or otherwise use privileged operations to talk to the hardware. But that driver is a lot smaller of a surface to secure than Xorg, which is a much larger codebase with many complicated moving parts.

Users of a video card should be able to do so securely: Look at something like WebGL, where many of a graphics card's features are exposed to the web, which is very much untrusted code.

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