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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. Joe Fitz‏ @securelyfitz Jan 5

      Thread time! Why can't they just quickly patch #meltdown or #spectre and push out another cpu? Why could it possibly take years? Why don't they use AGILE or x/y/z? Lots of reasons: (note: my goal is not to criticize chip manufacturers - it's to defend the constraints they have)

      18 replies 481 retweets 657 likes
      Show this thread
    2. Rich Felker‏ @RichFelker Jan 5
      Replying to @securelyfitz

      All of this is why you're supposed to make chicken bits to disable dubious, dangerous features like the sort of speculative execution that's at fault here.

      1 reply 2 retweets 9 likes
    3. Rich Felker‏ @RichFelker Jan 5
      Replying to @RichFelker @securelyfitz

      Failure to provide a way to turn off the unsafe features is what's irresponsible here; if they'd done is the safe & responsible way, a microcode update or even flipping a bit in an already-exposed MSR would have fixed it.

      2 replies 2 retweets 6 likes
    4. Joe Fitz‏ @securelyfitz Jan 5
      Replying to @RichFelker

      I have to believe there's a chicken bit for turning off speculative execution. But why would you want that, when the available OS level fixes probably provide an order of magnitude better performance? Helping that effort is pretty responsible IMHO.

      1 reply 1 retweet 14 likes
      Rich Felker‏ @RichFelker Jan 5
      Replying to @securelyfitz

      There are no OS level fixes for the most serious problem which is P0's "variant 1", and can't be. It doesn't cross OS/cpu privilege domains.

      4:00 PM - 5 Jan 2018
      • 3 Retweets
      • 6 Likes
      • ::1 N. Felipe the network is just an abstraction layer Daira Hopwood (abolish ICE) Matt Denton Henk Poley Christian Bach
      2 replies 3 retweets 6 likes
        1. New conversation
        2. Joe Fitz‏ @securelyfitz Jan 5
          Replying to @RichFelker

          Remember the iphone battery deal last month? Imagine the outcry if Intel pushed patches that dropped your cpu to 5 % of it's current performance. I think others might value the trade-off differently from you.

          2 replies 1 retweet 15 likes
        3. Rich Felker‏ @RichFelker Jan 5
          Replying to @securelyfitz

          They don't have to push a patch to do that. Just expose the MSR and document it and let users do it if they want to.

          1 reply 1 retweet 9 likes
        4. Joe Fitz‏ @securelyfitz Jan 5
          Replying to @RichFelker

          Fair request. I just doubt that anyone would use it...

          1 reply 1 retweet 10 likes
        5. Rich Felker‏ @RichFelker Jan 5
          Replying to @securelyfitz

          I would, and anyone with security requirements harder than their performance requirements should until they can install suitable replacement hardware.

          2 replies 2 retweets 24 likes
        6. Nuclear Football‏ @EuphoricEuler Jan 6
          Replying to @RichFelker @securelyfitz

          The real issue here is: Users don't care. . For an example how a low level security issue in widespread hw plays out in the real world, look at the mirai bug & bot net in router SW

          2 replies 1 retweet 3 likes
        7. Rich Felker‏ @RichFelker Jan 6
          Replying to @EuphoricEuler @securelyfitz

          Public health & self-defense are always entirely separate issues. You can legitimately criticize obstruction of the latter even when it wouldn't help the former.

          0 replies 1 retweet 4 likes
        8. End of conversation
        1. New conversation
        2. PJC‏ @pjcampbe11 Jan 5
          Replying to @RichFelker @securelyfitz

          Would seem that only Spectre (Variant 2) actually requires microcode update (technique 2) seems everything else can be mitigated at the OS level https://newsroom.intel.com/wp-content/uploads/sites/11/2018/01/Intel-Analysis-of-Speculative-Execution-Side-Channels.pdf …

          1 reply 0 retweets 0 likes
        3. Rich Felker‏ @RichFelker Jan 5
          Replying to @pjcampbe11 @securelyfitz

          No, variant 1 has no mitigation at all and Intel's position is that it's not a bug. It's also the variant that _all_ oooe cpus are vulnerable to.

          1 reply 0 retweets 1 like
        4. Rich Felker‏ @RichFelker Jan 5
          Replying to @RichFelker @pjcampbe11 @securelyfitz

          OK, the document you linked suggests a mitigation, but it's a non-solution; it requires all-new software and leaves it unsafe to run existing binaries.

          1 reply 0 retweets 1 like
        5. Rich Felker‏ @RichFelker Jan 5
          Replying to @RichFelker @pjcampbe11 @securelyfitz

          The mitigation also requires individual arch-specific hacks in every piece of software that might ever be affected, at every point where it might be affected. It's not a solution.

          0 replies 0 retweets 1 like
        6. End of conversation

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