For now, cryptographic work should be run on slower Icestorm cores
The GoFetch exploit isn't earth-shattering, as it's in a similar vein to Spectre, Meltdown, and other vectors that rely on a CPU's performance-boosting prediction features. Normally, there are software-based patches for chips that have hardware-level exploits, and usually that just involves disabling the speculative feature , but in the case of M1 and M2 CPUs, researchers say that's not possible.
The researchers address the common question of whether DMP can be disabled, explaining that yes, but only on some processors."We observe that the DIT bit set on M3 CPUs effectively disables the DMP. This is not the case for the M1 and M2." So, GoFetch can be solved with a software patch for M3 and Raptor Lake CPUs, but not for M1 and M2 chips since DMP will run no matter what.
It's never good when a feature that increases performance has to be disabled because it leaks potentially sensitive data, but not being able to disable that feature at all is even worse. One workaround is to just blind the DMP to sensitive data whenever it's being stored to or loaded from memory, but theHowever, there is one workaround that doesn't require any code rewrites.
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