Coarse-grained Control Flow Integrity Check for Processors with Sliding Register Windows.
MECO(2023)
摘要
Control Flow Integrity (CFI) checks arean effective way to detect control flow manipulation attacks. Protection isachieved by combining a static analysis to create a control flow graph and codeinstrumentation for runtime checks. A coarse-grained CFI check in contrastrelies on a ruleset to check for the validity of the control flow. It can beused alongside with other techniques to protect a processor fromreturn-oriented-programming attacks. This paper presents the firstimplementation of a coarse-grained CFI check specifically for processors withsliding register window, instrumenting interrupt handles instead of theapplication itself. Additionally, the security of the method is improved bycombining it with a simple XOR obfuscation technique to make it harder forattackers to target remaining legal addresses. Two (software-only andhardware-assisted) implementations are presented and evaluated.
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关键词
Xtensa,Return-oriented programming,Control-flow integrity,Windowed ABI
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