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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. Can Acar‏ @acar_can 9 Jun 2017
      Replying to @CopperheadOS @RichFelker

      I am biased here. This is exploring a new primitive. Prefer to see where this takes us rather than waiting for a long term perfect thing.

      1 reply 0 retweets 0 likes
    2. Rich Felker‏ @RichFelker 9 Jun 2017
      Replying to @acar_can @CopperheadOS

      Hardware shouldn't even be involved. It's about grasping at ways to monopolize the cpu/isa market, not protecting users.

      2 replies 0 retweets 0 likes
    3. Can Acar‏ @acar_can 9 Jun 2017
      Replying to @RichFelker @CopperheadOS

      Thank you for knowing my goals and motivations better than I do. They may be different than

      1 reply 0 retweets 0 likes
    4. Can Acar‏ @acar_can 9 Jun 2017
      Replying to @acar_can @RichFelker @CopperheadOS

      ... the reasons for ARM to pick them up. Still it is an exciting primitive and hopefully fills a gap.

      1 reply 0 retweets 0 likes
    5. CopperheadOS‏ @CopperheadOS 9 Jun 2017
      Replying to @acar_can @RichFelker

      It's a probabilistic mitigation in direct conflict with an existing probabilistic mitigation for entropy. Improving one hurts the other.

      2 replies 0 retweets 1 like
    6. Can Acar‏ @acar_can 9 Jun 2017
      Replying to @CopperheadOS @RichFelker

      It actually works pretty well with all forms of ASLR. Did you have something else in mind?

      1 reply 0 retweets 0 likes
    7. CopperheadOS‏ @CopperheadOS 9 Jun 2017
      Replying to @acar_can @RichFelker

      It doesn't work well with ASLR since ARM64 currently has quite weak ASLR and fixing that would mean taking away bits from this new feature.

      2 replies 0 retweets 0 likes
    8. Can Acar‏ @acar_can 9 Jun 2017
      Replying to @CopperheadOS @RichFelker

      11 bits is enough for PA. ASLR can have its 52 bits if it can afford the extra page table memory.

      1 reply 0 retweets 0 likes
    9. CopperheadOS‏ @CopperheadOS 9 Jun 2017
      Replying to @acar_can @RichFelker

      The address space is still capped at 48 bit, no? That leaves 47-bit for userspace which is 35-bit in terms of 4k pages rather than bytes.

      2 replies 0 retweets 0 likes
    10. CopperheadOS‏ @CopperheadOS 9 Jun 2017
      Replying to @CopperheadOS @acar_can @RichFelker

      11 bits means an 1/2048 chance of bypassing it simply by guessing. At least it's not as bad as the KASLR entropy.

      2 replies 0 retweets 0 likes
      Rich Felker‏ @RichFelker 10 Jun 2017
      Replying to @CopperheadOS @acar_can

      Or: attack 1 billion devices, not caring which 2 million you pwn...

      5:13 AM - 10 Jun 2017
      1 reply 0 retweets 0 likes
        1. Can Acar‏ @acar_can 10 Jun 2017
          Replying to @RichFelker @CopperheadOS

          This is in the context of having strong ASLR and a 52 bit address space. PA adds bits ASLR can not use otherwise.

          0 replies 0 retweets 0 likes
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