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Incident Response Readiness - Gerard Johansen - PSW #794

Security Weekly Podcast Network (Audio)

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How a Simple XOR Can Cause a Micro Architectural Stack Overflow

A simple XOR can cause a micro architectural stack overflow. This is against AMD processors. They talk about phantom speculation trigger, misprediction without any branch at the source,. That's sinking. Training and transient execution manipulate future mispredictions through a previous misprediction that we trigger.AMD proposed a different mitigation for the Linux kernel by reducing all returns in the kernel to a single one. It becomes possible to ensure a safe, but still incorrect branch predictor state each time this return is executed.

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