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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. Jon Masters‏ @jonmasters Jan 7

      A more technical writeup on what can be done to address #Meltdown and #Spectre in future CPU designs. If there's interest, I can write a longer version with graphics and so on:https://www.linkedin.com/pulse/addressing-meltdown-spectre-future-silicon-jon-masters/ …

      4 replies 18 retweets 36 likes
    2. Rich Felker‏ @RichFelker Jan 8
      Replying to @jonmasters @solardiz

      I don't see anything (here, or from Intel) addressing Spectre variant 1, which is really the root cause of the problem. Variant 2 wouldn't exist without the flaw behind variant 1.

      1 reply 0 retweets 0 likes
    3. Jon Masters‏ @jonmasters Jan 8
      Replying to @RichFelker @solardiz

      That’s because I don’t believe variant 1 has a straightforward hardware fix. But it is very low overhead to do it in software, so I think that’s where it ends up for the moment...

      1 reply 0 retweets 0 likes
    4. Rich Felker‏ @RichFelker Jan 8
      Replying to @jonmasters @solardiz

      There's no universal sw fix. It requires hacks everywhere that might be affected. That's not viable (many will be missed) much less sustainable.

      2 replies 0 retweets 0 likes
    5. Jon Masters‏ @jonmasters Jan 8
      Replying to @RichFelker @solardiz

      Right - it’s a compiler level thing or you just have hacks. And I agree. But the big hammer isn’t going to be viable so we *will* have hacks

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker Jan 8
      Replying to @jonmasters @solardiz

      No, it's a kernel-level thing or you just have hacks. Inability to safely run existing binaries for the baseline ISA means you're effectively not compatible with the original ISA/ABI... in which case, why stick with x86 at all?

      10:03 PM - 8 Jan 2018
      1 reply 0 retweets 0 likes
        1. Rich Felker‏ @RichFelker Jan 8
          Replying to @RichFelker @jonmasters @solardiz

          I agree we *will* have hacks for the forseeable future, but the hacks will be partial mitigations for safety in existing broken chips. New chips need full safety against Spectre variant 1.

          0 replies 0 retweets 0 likes
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