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The discarded work still touched memory, and what it touched is now faster to read than what it did not.\u003c\/p\u003e\u003cp\u003eMeltdown, CVE-2017-5754, used that to read kernel memory from an unprivileged process. It is fixable: stop mapping the kernel into every process's address space. That is KPTI, and it costs a few per cent. Spectre, CVE-2017-5753 and CVE-2017-5715, is the harder one, because it is not a defect in a particular chip. It is what speculation is. There are mitigations, added pattern by pattern as each new one is found. The processor rolled the work back. It could not roll back the fact that it had done it.\u003c\/p\u003e\u003cp\u003eDrawn as an engraved slate chalkboard on a wooden easel, wiped clean but for one ghosted line of chalk still legible in the smear, an eraser and a stub of chalk on the tray. Large back print. UNHACKED emblem at the left chest. 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