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posted by martyb on Saturday February 16 2019, @02:08PM   Printer-friendly
from the so-that-means...-we-are-screwed dept.
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  • (Score: 2) by Azuma Hazuki on Saturday February 16 2019, @11:04PM (1 child)

    by Azuma Hazuki (5086) on Saturday February 16 2019, @11:04PM (#802228) Journal

    Something I'd been wondering since this came out: isn't the solution not to drop speculative execution entirely, but just to make sure parts of the chip can't read what they have no business reading?

    Ever since I learned what NUMA was, it's occurred to me that individual systems can look like an entire LAN in some ways. And with the ring bus, various DSPs, and now Infinity Fabric and its inevitable future kissing cousins, this analogy only looks set to become even stronger. As no network is secure without a firewall, access controls, and ideally some sort of IDS, maybe CPUs need to be designed this way too.

    And *properly* designed so that this stuff is default-deny; the *last* thing we need is some snooping ring-negative-one coprocessor like the IME on steroids controlling access, because when THAT inevitably gets owned, the entire security model is busted and we're back to square one.

    I am "that girl" your mother warned you about...
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  • (Score: 0) by Anonymous Coward on Sunday February 17 2019, @07:05AM

    by Anonymous Coward on Sunday February 17 2019, @07:05AM (#802401)

    Or just make cache cheaper and smaller.