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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. Bruce Leidl‏ @bleidl 24 Jun 2017

      If you ever wonder why grsecurity is not in upstream Linux here's one reason.https://www.spinics.net/lists/kernel/msg2540934.html …

      6 replies 33 retweets 29 likes
    2. Bruce Leidl‏ @bleidl 24 Jun 2017
      Replying to @bleidl

      After patiently defending the technical merit of their work to the kernel community for 15 years this is what they get in return

      1 reply 3 retweets 6 likes
    3. Bruce Leidl‏ @bleidl 24 Jun 2017
      Replying to @bleidl

      You're the clown Linus. Grsecurity correctly configured doesn't break anything except vulnerabilities. Ask anybody who actually uses it.

      3 replies 4 retweets 9 likes
    4. Rich Felker‏ @RichFelker 24 Jun 2017
      Replying to @bleidl

      That's because those of us who realize how much it breaks don't use it.

      1 reply 0 retweets 3 likes
    5. Rich Felker‏ @RichFelker 24 Jun 2017
      Replying to @RichFelker @bleidl

      For example breaking mmap requested address does not break any vuln, but removes functionality available no other way...

      1 reply 0 retweets 1 like
      Rich Felker‏ @RichFelker 24 Jun 2017
      Replying to @RichFelker @bleidl

      ...and encourages extremely bad, incorrect, unsafe code (MAP_FIXED on address you don't already own) as a workaround.

      12:01 PM - 24 Jun 2017
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Rich Felker‏ @RichFelker 24 Jun 2017
          Replying to @RichFelker @bleidl

          See this thread for what I mean by "encourages": http://www.openwall.com/lists/musl/2017/06/10/3 …

          1 reply 0 retweets 2 likes
        3. CopperheadOS‏ @CopperheadOS 24 Jun 2017
          Replying to @RichFelker @bleidl

          It also ties the whole better ASLR implementation of that despite ignoring mmap hints being the only real reason for that breaking anything.

          1 reply 0 retweets 0 likes
        4. CopperheadOS‏ @CopperheadOS 24 Jun 2017
          Replying to @CopperheadOS @RichFelker @bleidl

          So you need RANDMMAP exceptions to make hints respected, but that disables PaX ASLR, and a bit of vanilla ASLR is even disabled too (brk).

          1 reply 0 retweets 0 likes
        5. CopperheadOS‏ @CopperheadOS 24 Jun 2017
          Replying to @CopperheadOS @RichFelker @bleidl

          They also stubbornly use a non-CSPRNG for ASLR, while vanilla moved to CSPRNG... but there are bigger issues than userspace hardening bits.

          1 reply 0 retweets 1 like
        6. CopperheadOS‏ @CopperheadOS 24 Jun 2017
          Replying to @CopperheadOS @RichFelker @bleidl

          They never seemed open to suggestions on how to clean things up or improve them. Lots of the design is just there solely out of spite too.

          1 reply 0 retweets 0 likes
        7. CopperheadOS‏ @CopperheadOS 24 Jun 2017
          Replying to @CopperheadOS @RichFelker @bleidl

          i.e. keeping entire separate implementations of features rather than reducing the diff size by reusing code or making small adjustments.

          1 reply 0 retweets 0 likes
        8. CopperheadOS‏ @CopperheadOS 24 Jun 2017
          Replying to @CopperheadOS @RichFelker @bleidl

          Most grsecurity users that have enabled the SIZE_OVERFLOW feature or the original KSTACKOVERFLOW are aware of how much stuff they break.

          3 replies 0 retweets 0 likes
        9. 7 more replies

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