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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. Filip Jerzy Pizło‏ @filpizlo May 31

      I agree with this. C and C++ would be better without UB. http://www.yodaiken.com/wp-content/uploads/2018/05/ub-1.pdf …

      3 replies 5 retweets 7 likes
    2. Sam Tobin-Hochstadt‏ @samth May 31
      Replying to @filpizlo

      I was thinking about this yesterday, but the hard question is what should out of bounds writes be specified to do? What about UAF? I don't see how to specify this without ruling out genuine optimizations (which is not to say that many of the dumb UB shouldn't be eliminated).

      3 replies 0 retweets 3 likes
    3. John Regehr‏ @johnregehr May 31
      Replying to @samth @filpizlo

      yeah, there are several UBs that are hard to eliminate without changing these languages beyond recognition. this ship sailed long ago. we should focus on new languages but also on C/C++ dialects that don't aim for full back compatibility.

      3 replies 2 retweets 8 likes
    4. Filip Jerzy Pizło‏ @filpizlo May 31
      Replying to @johnregehr @samth

      I don’t think that’s right. The signed math UBs and strict aliasing are just dumb. You don’t need to replace the language to fix those.

      3 replies 0 retweets 1 like
    5. John Regehr‏ @johnregehr May 31
      Replying to @filpizlo @samth

      I'm more talking about things like use of dead stack slots and to a much lesser extent, use of uninitialized storage

      1 reply 0 retweets 0 likes
    6. John Regehr‏ @johnregehr May 31
      Replying to @johnregehr @filpizlo @samth

      since probably >95% of code suffers a negligible performance penalty if you just zero all allocations

      4 replies 0 retweets 0 likes
    7. Rich Felker‏ @RichFelker May 31
      Replying to @johnregehr @filpizlo @samth

      See musl's strstr for an example that suffers critically if you do.

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker May 31
      Replying to @RichFelker @johnregehr and

      We have a size_t array that would be noticeably costly to zero in many real use cases and instead use a validity bit array.

      7:47 PM - 31 May 2018
      0 replies 0 retweets 0 likes

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