New Intel cpu bug?https://twitter.com/iximeow/status/993995509151879170 …
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Replying to @RichFelker
afaict it's less bug and "everyone didn't know it does that" + mov SS being exceedingly rare
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Replying to @iximeow @RichFelker
Fun fact: According to Intel, Meltdown is not a bug. https://www.intel.com/content/www/us/en/architecture-and-technology/facts-about-side-channel-analysis-and-intel-products.html …pic.twitter.com/bCusLDQTmm
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Replying to @RichFelker @noop_noob
what aspect of it? not checking permissions on memory you're speculatively accessing, sure. generally, timing side-channels because you can massage the pipeline, though?
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Meltdown is "not checking permissions". It's a clear bug. Spectre is a flaw in the whole concept of speculative execution. My take on that is that, without advanced mitigation, implementing a cpu using speculation is a bug.
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