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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. Rich Felker‏ @RichFelker 14 May 2017

      Rich Felker Retweeted CopperheadOS

      Which is why the kernel folks' insistence on keeping drivers in the kernel rather than sandboxed user processes is so backwards...https://twitter.com/CopperheadOS/status/863454511674871808 …

      Rich Felker added,

      CopperheadOS @CopperheadOS
      Most Linux kernel vulnerabilities on mobile are in the out-of-tree SoC platform drivers, which makes sense when comparing the code size.
      4 replies 13 retweets 15 likes
    2. Rich Felker‏ @RichFelker 14 May 2017
      Replying to @RichFelker

      You don't have to accept microkernel dogma to get drivers out of kernel. Keep the whole OS model monolithic if you want. Just ban drivers!

      3 replies 0 retweets 1 like
    3. Mx. Evan Phoenix‏ @evanphx 14 May 2017
      Replying to @RichFelker

      I wish so much Linux had QNX's lightweight messaging system. Could make drivers so nice.

      1 reply 0 retweets 0 likes
    4. Rich Felker‏ @RichFelker 14 May 2017
      Replying to @evanphx

      Yeah, I really don't care what the mechanism is or what the performance aspects are as long as it works, though.

      2 replies 0 retweets 0 likes
    5. Mx. Evan Phoenix‏ @evanphx 14 May 2017
      Replying to @RichFelker

      It's the perf issues that keep people from giving it real consideration. I wonder if a shim could allow some drivers to run this way today..

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker 14 May 2017
      Replying to @evanphx

      Yes. The easiest way to shim it is give each driver a fake whole-linux-kernel in its memory space, have that link up device externally.

      7:24 AM - 14 May 2017
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Rich Felker‏ @RichFelker 14 May 2017
          Replying to @RichFelker @evanphx

          This fake kernel would have no perms and see no other hardware, just provide linkage shims for the driver code.

          2 replies 0 retweets 0 likes
        3. Mx. Evan Phoenix‏ @evanphx 14 May 2017
          Replying to @RichFelker

          Yup yup. How to manage things like ioports and device mapped memory have a big impact on perf and security.

          0 replies 0 retweets 0 likes
        4. End of conversation

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