3 ms·
If any quantity about what the processor does, outside the intended effect, has a different distribution when X happens versus Y, then the distribution of that
by eli_gottlieb 9y ago
If any quantity about what the processor does, outside the intended effect, has a different distribution when X happens versus Y, then the distribution of that quantity is exploitable. Period.
Any nonuniform distribution in any quantity that is not part of the spec is exploitable!
- fpoling 9y agoIt is only exploitable if one can measure the difference and extract useful information. Until Spectre guys discovered the double read technique, the expectation was that speculative execution did not allow to extract useful information besides extremely artificial theoretical cases.