Worth pointing out the note at the end, that he discovered it after it had already been patched. It's pretty freaking bad, yeah, but its not like it was being exploited in the wild before fix, which is always a good thing to remember.
Ha. Who needs Meltdown when the Windows 7 kernel just gave every userspace process writable page tables? "Oops." http://blog.frizk.net/2018/03/total-meltdown.html …
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This is one of those cases where the important thing is not the actual problem (which is pretty bad in and of itself) but *how* it happened. There's clearly a QA failure here at some point.
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Well, apparently you do need Meltdown! No Meltdown, no patch, no page tables available in user mode. ¯\_(ツ)_/¯
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