this post was submitted on 25 Jul 2023
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Technology

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Encryption-breaking, password-leaking bug in many AMD CPUs could take months to fix (arstechnica.com)
submitted 1 year ago by Lanky_Pomegranate530@lemmy.world to c/technology@lemmy.world
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[–] anlumo@feddit.de 13 points 1 year ago (1 children)

It wasn't branch prediction alone, it was the cache combined with branch prediction. The problem is that even discarded outcomes fill the cache with data. Those older vulnerabilities also had the problem that the access permissions check was done after the branch prediction. It's probably too expensive to do when it's not even clear yet whether the branch is going to be taken (that's just speculation on my part though).

[–] jumperalex@lemmy.world 10 points 1 year ago

(that’s just speculation on my part though).

I see what you did there, even if you didn't :)