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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. CopperheadOS‏ @CopperheadOS 16 Feb 2016
      Replying to @CopperheadOS

      @musllibc @RichFelker Then there's a choice between OpenBSD-style memory protection and/or glibc-style XOR for atexit, pthread_atfork, etc.

      2 replies 0 retweets 1 like
    2. CopperheadOS‏ @CopperheadOS 16 Feb 2016
      Replying to @CopperheadOS

      @musllibc @RichFelker It'd also be awesome if musl had a compile-time opt-in to a security-focused allocator like an OpenBSD malloc port.

      1 reply 0 retweets 0 likes
    3. Rich Felker‏ @RichFelker 16 Feb 2016
      Replying to @CopperheadOS

      @CopperheadSec I'd rather see a list of malloc security goals and see if we could meet most in the next-gen production-quality malloc.

      2 replies 0 retweets 0 likes
    4. CopperheadOS‏ @CopperheadOS 16 Feb 2016
      Replying to @RichFelker

      @RichFelker Aiming for performance leads to a much different design. A hardened allocator doesn't have inline metadata. Can't do both well.

      1 reply 0 retweets 0 likes
    5. CopperheadOS‏ @CopperheadOS 16 Feb 2016
      Replying to @CopperheadOS

      @RichFelker Relying on inline metadata ends up ruling out good security properties like a guaranteed abort for free(any_invalid_address).

      2 replies 0 retweets 0 likes
    6. Rich Felker‏ @RichFelker 16 Feb 2016
      Replying to @CopperheadOS

      @CopperheadSec How so? Check header==(footer^secret). This will, with high probability, catch invalid frees.

      1 reply 0 retweets 0 likes
    7. CopperheadOS‏ @CopperheadOS 16 Feb 2016
      Replying to @RichFelker

      @RichFelker Not at all the same. Uninitialized data access and out-of-bounds reads (especially one element past the end) are very common.

      1 reply 0 retweets 0 likes
    8. CopperheadOS‏ @CopperheadOS 16 Feb 2016
      Replying to @CopperheadOS

      @RichFelker It's not the only missing guarantee anyway. It's just one example a nice security property gained from non-inline metadata.

      1 reply 0 retweets 0 likes
    9. CopperheadOS‏ @CopperheadOS 16 Feb 2016
      Replying to @CopperheadOS

      @RichFelker Anyway, if you have headers and/or footers, it's not comparable to modern performance-oriented allocators without that overhead.

      2 replies 0 retweets 0 likes
    10. Rich Felker‏ @RichFelker 16 Feb 2016
      Replying to @CopperheadOS

      @CopperheadSec I'm generally of the view that "modern performance-oriented allocators" are a load of crap. :-)

      2 replies 0 retweets 0 likes
      Rich Felker‏ @RichFelker 16 Feb 2016

      @CopperheadSec Headers/footers, if validated well, also go a long way towards mitigating exploitable off-by-1 heap overflows.

      7:00 PM - 16 Feb 2016
      1 reply 0 retweets 0 likes
        1. New conversation
        2. CopperheadOS‏ @CopperheadOS 16 Feb 2016
          Replying to @RichFelker

          @RichFelker They are, but it can be better without the metadata there at all. Spending two extra bits per allocation isn't very significant.

          1 reply 0 retweets 0 likes
        3. Rich Felker‏ @RichFelker 16 Feb 2016
          Replying to @CopperheadOS

          @CopperheadSec I've considered size-segregated pools with atomic TAS bitmaps to solve frag, overhead, and lock contention.

          0 replies 0 retweets 0 likes
        4. End of conversation

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