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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. Steve Canon‏ @stephentyrone 29 Nov 2017
      Replying to @stephentyrone @volatile_void

      Also, they never do it right.

      1 reply 0 retweets 0 likes
    2. friend void‏ @volatile_void 29 Nov 2017
      Replying to @stephentyrone

      Not the first time, granted.

      1 reply 0 retweets 0 likes
    3. Steve Canon‏ @stephentyrone 29 Nov 2017
      Replying to @volatile_void

      If I had a dollar for every allegedly constant-time primitive written in C, I could buy a nice car. You cannot claim C code to be constant time, because the C abstract machine has no model of time.

      2 replies 4 retweets 9 likes
    4. Steve Canon‏ @stephentyrone 29 Nov 2017
      Replying to @stephentyrone @volatile_void

      You can't even claim constant-time for most assembly code unless you tie it to a specific µarchitecture, because most ISAs make no guarantee of a constant-time for the instructions you're using.

      2 replies 0 retweets 0 likes
    5. Rich Felker‏ @RichFelker 29 Nov 2017
      Replying to @stephentyrone @volatile_void

      pusha ; cpuid ; popa between every pair of instructions. ;-)

      2 replies 0 retweets 1 like
    6. Rich Felker‏ @RichFelker 29 Nov 2017
      Replying to @RichFelker @stephentyrone @volatile_void

      Jokes aside, closest you'll probably come is implementing a bytecode interpreter to make it implausible for uarch to make op times vary.

      2 replies 0 retweets 0 likes
    7.  🎃 unsafe { mem::transmute(@erincandescent) }  🎃‏ @erincandescent 29 Nov 2017
      Replying to @RichFelker @stephentyrone @volatile_void

      Honestly your average interpreter is probably going to leak gobs of secret information into the branch predictor. this is a terrible idea.

      2 replies 0 retweets 3 likes
    8. Rich Felker‏ @RichFelker 29 Nov 2017
      Replying to @erincandescent @stephentyrone @volatile_void

      No branching needed.

      2 replies 0 retweets 0 likes
    9. Rich Felker‏ @RichFelker 29 Nov 2017
      Replying to @RichFelker @erincandescent and

      You forget that add (with pc as a possible operand) is Turing complete. :-)

      2 replies 0 retweets 0 likes
    10.  🎃 unsafe { mem::transmute(@erincandescent) }  🎃‏ @erincandescent 29 Nov 2017
      Replying to @RichFelker @stephentyrone @volatile_void

      The interpreter implementation itself will contain branches. probably data dependent branches.

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker 29 Nov 2017
      Replying to @erincandescent @stephentyrone @volatile_void

      No, it's literally a while loop that computes 2 src addrs & one dest from insn bits & indirections, then does add & store.

      4:56 PM - 29 Nov 2017
      0 replies 0 retweets 0 likes

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