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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. whitequark‏ @whitequark Apr 26
      Replying to @RichFelker @erincandescent @pikhq

      except, you know, I *want* to be able to adjust the boot options from within my OS

      3 replies 0 retweets 1 like
    2. Rich Felker‏ @RichFelker Apr 26
      Replying to @whitequark @erincandescent @pikhq

      That's reasonable, if it happens under the full control and authorization of the OS. It's not if it happens behind the OS's back through sketchy unseen and unreviewed code.

      2 replies 0 retweets 0 likes
    3.  🎃 unsafe { mem::transmute(@erincandescent) }  🎃‏ @erincandescent Apr 26
      Replying to @RichFelker @whitequark @pikhq

      It happens because the OS calls the SetVariable function which exists for this purpose

      1 reply 0 retweets 0 likes
    4. Rich Felker‏ @RichFelker Apr 26
      Replying to @erincandescent @whitequark @pikhq

      If you allow EFI code from system or peripheral firmware to run on the metal, it can happen any time they decide they want to. That's the problem. It should _only_ be possible when OS does it.

      1 reply 0 retweets 0 likes
    5.  🎃 unsafe { mem::transmute(@erincandescent) }  🎃‏ @erincandescent Apr 26
      Replying to @RichFelker @whitequark @pikhq

      No. It can only happen when the OS calls into said EFI code. Functions don't just call themselves

      1 reply 0 retweets 1 like
    6. Rich Felker‏ @RichFelker Apr 26
      Replying to @erincandescent @whitequark @pikhq

      Like when some hardware driver calls into firmware on the metal in ring0 with unrestricted memory access rather than actually implementing the functionality itself.

      1 reply 0 retweets 0 likes
    7.  🎃 unsafe { mem::transmute(@erincandescent) }  🎃‏ @erincandescent Apr 26
      Replying to @RichFelker @whitequark @pikhq

      The only times the kernel calls into UEFI are To exit boot services mode To ger/set firmware variables As a last ditch way of rebooting As a last ditch way of getting/setting the time (no RTC driver) To set wake from power off timers

      2 replies 0 retweets 0 likes
    8.  🎃 unsafe { mem::transmute(@erincandescent) }  🎃‏ @erincandescent Apr 26
      Replying to @erincandescent @RichFelker and

      There is also ACPI byte code needed on modern x86 systems, but that's already in an interpreter

      1 reply 0 retweets 1 like
    9. Rich Felker‏ @RichFelker Apr 26
      Replying to @erincandescent @whitequark @pikhq

      Exactly. Doing it as bytecode is the right way - it inherently invites the OS kernel to control access as it sees fit without a costly emulation/virtualization layer that incentivizes omitting it.

      3 replies 0 retweets 0 likes
    10.  🎃 unsafe { mem::transmute(@erincandescent) }  🎃‏ @erincandescent Apr 26
      Replying to @RichFelker @whitequark @pikhq

      You may be the first person I've encountered to describe ACPI byte code as 'how it should be'

      1 reply 0 retweets 3 likes
      Rich Felker‏ @RichFelker Apr 26
      Replying to @erincandescent @whitequark @pikhq

      Well no code at all would be preferable (documented mmio interfaces represented in device tree) but if you're going to have code, bytecode is the way to go.

      4:44 PM - 26 Apr 2018
      1 reply 0 retweets 1 like
        1. New conversation
        2. Patrick Walton‏ @pcwalton Apr 26
          Replying to @RichFelker @erincandescent and

          Yeah, I was gonna say, isn’t it better to just have all hardware of a certain class work the same way?

          1 reply 0 retweets 0 likes
        3. Rich Felker‏ @RichFelker Apr 26
          Replying to @pcwalton @erincandescent and

          Yes. USB device classes with standard protocols, no drivers at all, is how ALL hardware should work.

          1 reply 0 retweets 1 like
        4. whitequark‏ @whitequark Apr 26
          Replying to @RichFelker @pcwalton and

          yessss, please lock the bad decisions of some shitty committee EVEN FURTHER into the stack

          0 replies 0 retweets 1 like
        5. End of conversation

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