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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 Jan 22

      Rich Felker Retweeted John Regehr

      Wow some actual technical information on the spectre mitigation uc updates.https://twitter.com/johnregehr/status/955620344932442112 …

      Rich Felker added,

      John Regehr @johnregehr
      always nice to see the grownups speaking up https://lkml.org/lkml/2018/1/22/598 …
      1 reply 2 retweets 4 likes
      Show this thread
    2. Rich Felker‏ @RichFelker Jan 22

      Any idea if they have a register to just turn off branch prediction yet?

      1 reply 0 retweets 0 likes
      Show this thread
    3. Cody ☕️ 🦀‏ @valarauca1 Jan 22
      Replying to @RichFelker

      They do. Google's ret trampoline white paper talks about them "disabling branch prediction" for tests. So I think intel is just keeping us in the dark.

      3 replies 0 retweets 0 likes
    4. friend void‏ @volatile_void Jan 22
      Replying to @valarauca1 @RichFelker

      1) retpoline is a substitute for indirect branches 2) retpoline is a construct that can be used on a case-by-case basis, it does not change the behavior of existing indirect branches 3) the actual instruction to do exactly what Rich asks is named and described in the linked post

      1 reply 0 retweets 0 likes
    5. Rich Felker‏ @RichFelker Jan 22
      Replying to @volatile_void @valarauca1

      One-off flush is not a disable. It does nothing to make running existing binaries safe.

      1 reply 0 retweets 0 likes
    6. friend void‏ @volatile_void Jan 22
      Replying to @RichFelker @valarauca1

      Yes I realized that you just wanted an instruction to run once, not once per context switch. You’re better off switching to an in-order arch for that. I understand Atom still is in-order. I have a pentium from 1996 that I can give you, too.

      2 replies 0 retweets 0 likes
      Rich Felker‏ @RichFelker Jan 22
      Replying to @volatile_void @valarauca1

      Historically TR12 MSR bit 0 was NBP (no branch prediction) but I can't find if it still exists.

      8:54 PM - 22 Jan 2018
      • 1 Like
      • Cody☕️🦀
      1 reply 0 retweets 1 like
        1. New conversation
        2. friend void‏ @volatile_void Jan 22
          Replying to @RichFelker @valarauca1

          Didn't it just disable dynamic branch prediction? Spectre-like vulnerabilities still exist with static prediction (you actually save the attacker the bother of poisoning the branch prediction first).

          1 reply 0 retweets 0 likes
        3. Rich Felker‏ @RichFelker Jan 22
          Replying to @volatile_void @valarauca1

          Not sure.

          0 replies 0 retweets 0 likes
        4. End of conversation

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