title: Why does windows handle scrollbars in kernel?
body: <p>The new <a href="http://breakingmalware.com/vulnerabilities/one-bit-rule-bypassing-windows-10-protections-using-single-bit/" rel="noreferrer">1-bit exploit</a> of "all" windows versions uses a bug in the kernel code that handles scrollbars. That got me thinking. Why does windows handle scrollbars in kernel, rather than user mode? Historical reasons? Does any other OS do this?</p>