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"Beyond Stupid" Paranoid L1d Cache Flushing Looks Like It Will Try Again For Linux 5.15

Submitted by Roy Schestowitz on Wednesday 28th of July 2021 03:41:31 PM Filed under
Linux
Security

The work going on for over a year to optionally flush the L1 data cache on context switching is going to try again for the next kernel cycle as an opt-in feature for select tasks. This was the feature rejected last year by Linus Torvalds that went on to "beyond stupid" and other concerns about it when it was trying to be mainlined originally.

This paranoid L1d cache flushing on context switch remains an opt-in feature and led by Amazon engineers. While frequently flushing the L1 data cache leads to significant performance implications, Amazon's motivation is over the increasing number of CPU vulnerabilities with the likes of the CVE-2020-0550 improper data forwarding vulnerability and others along with concerns over other yet-to-be-found vulnerabilities.

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