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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. Watson Ladd‏ @WatsonLadd Jan 27
      Replying to @RichFelker @siddhesh_p and

      If compiler can do it, why is it bogus? We require compilers to allocate registers.

      2 replies 0 retweets 0 likes
    2. Rich Felker‏ @RichFelker Jan 27
      Replying to @WatsonLadd @siddhesh_p and

      Because that's a fundamental change to the ISA tgat renders existing software unsupported. A new ISA could require it, of course, but that seems dangerous & error-prone.

      1 reply 0 retweets 0 likes
    3. Watson Ladd‏ @WatsonLadd Jan 27
      Replying to @RichFelker @siddhesh_p and

      Why is that "dangerous and error-prone"? Lots of CPUs only have one trust boundary. Why do we need to make fix only hardware?

      1 reply 0 retweets 0 likes
    4. Rich Felker‏ @RichFelker Jan 27
      Replying to @WatsonLadd @siddhesh_p and

      Because people sometimes write asm by hand & are likely to get it wrong. But nobody's making a new ISA right now anyway. RV is already spec'd & in use.

      1 reply 0 retweets 0 likes
    5. Watson Ladd‏ @WatsonLadd Jan 27
      Replying to @RichFelker @siddhesh_p and

      You can add speculation barriers where they are needed.

      1 reply 0 retweets 0 likes
    6. Rich Felker‏ @RichFelker Jan 27
      Replying to @WatsonLadd @siddhesh_p and

      Again, adding them to an existing ISA is pointless because you're not fixing the bug - that you broke the original ISA contract.

      1 reply 0 retweets 0 likes
    7. Watson Ladd‏ @WatsonLadd Jan 27
      Replying to @RichFelker @siddhesh_p and

      We've got an actual security issue: it doesn't matter whether we change the ISA contact+modify software to fix. What matters is it gets fixed. And lots of machines won't have this issue.

      1 reply 0 retweets 0 likes
    8. Rich Felker‏ @RichFelker Jan 27
      Replying to @WatsonLadd @siddhesh_p and

      Yes it does matter. You really have no idea what you're talking about.

      1 reply 0 retweets 0 likes
    9. Rich Felker‏ @RichFelker Jan 27
      Replying to @RichFelker @WatsonLadd and

      Here "changing the ISA" means "declaring all existing binaries AND TOOLING for the old ISA deprecated and unusable".

      2 replies 0 retweets 0 likes
    10. Watson Ladd‏ @WatsonLadd Jan 27
      Replying to @RichFelker @siddhesh_p and

      Could you be specific about what breaks? For most machines in the world only the browser's JIT engine needs a change. For virtualized servers the hypervisor.

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker Jan 27
      Replying to @WatsonLadd @siddhesh_p and

      That's really naive. An interpreter/JIT running hostile code is the most obvious way to exploit Spectre but there's no guarantee it's the only one.

      1:44 PM - 27 Jan 2018
      1 reply 0 retweets 0 likes
        1. Rich Felker‏ @RichFelker Jan 27
          Replying to @RichFelker @WatsonLadd and

          I strongly suspect there will be ways to exploit via specially crafted files thought of as "pure data".

          0 replies 0 retweets 0 likes
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