Do modern CPUs flush branch predictor state on context switch? https://lkml.org/lkml/2018/1/4/635 … seems to indicate that they don’t. If not, why are we treating process separation as “the thing that fixes Spectre”?
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Well, Fission was clearly announced as an answer to Spectre and alike.
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So was Site Isolation in Chrome. Site Isolation has obvious benefits as a way to mitigate memory safety vulnerabilities between untrusted domains. Its use as a Spectre solution is much less clear to me.
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