BATTLE OF SKM AND IUM
blackhat2015
blackhat2015
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VOCABULARY REVIEW<br />
• “Normal World” / “Secure World” – ARM/TrustZone-borrowed terms to describe secured secrets<br />
• SMART/VSM – Secure Mode Application Run Time / Virtual Secure Mode – why we’re here today<br />
• SK – SMART Kernel, one of the core modules running inside <strong>SKM</strong><br />
• HLOS – High Level OS, an older name for “Normal World”<br />
• NTOS – NT OS, the “Normal World” kernel (Ring 0)<br />
• <strong>IUM</strong> – Isolated User Mode, another name for “Secure World”, specifically Ring 3<br />
• <strong>SKM</strong> – Secure Kernel Mode, the “Secure World”, but running in Ring 0<br />
• VTL – Virtual Trust Level, a synthetic “ring level” managed by the hypervisor (higher is more privileged)<br />
• VTL 0 -> Normal World/Mode<br />
• VTL 1 -> Secure World/Mode<br />
• VBS – Virtualization Based Security, the set of features that VSM enables on Windows 10 / Server 2016
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