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Security Leftovers

Submitted by Roy Schestowitz on Monday 13th of September 2021 09:18:26 PM Filed under
Security
»

Still-Pending AMD PSF Control Patch To Be Retailored For KVM

Submitted by Roy Schestowitz on Monday 13th of September 2021 09:20:58 PM.
  • Still-Pending AMD PSF Control Patch To Be Retailored For KVM

    Of all the great stuff for AMD in Linux 5.15, one of the patches still not having yet been mainlined is the control support around Predictive Store Forwarding (PSF) with Zen 3 processors. It's been six months since AMD published their security whitepaper around PSF while the Linux patch has yet to be mainlined while now it seems will be updated for a reduced focus on KVM usage.

    It's been about six months already since AMD published their security analysis of Zen 3's PSF feature that could potentially lead to a side channel attack. Predictive Store Forwarding with the latest-generation Ryzen and EPYC processors allows for speculatively executing instructions based on what it thinks the result of the load will be and while the predictions should be largely accurate, there is the small possibility of incorrect CPU speculation. PSF speculation going awry would be similar to Spectre V4 / SSB.

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