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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 20 Nov 2015
      Replying to @CopperheadOS

      @RichFelker For example, turning on -fsanitize=shift -fsanitize-undefined-trap-on-error makes undefined shifts trap. http://clang.llvm.org/docs/UsersManual.html#controlling-code-generation …

      1 reply 0 retweets 4 likes
    2. Rich Felker‏ @RichFelker 20 Nov 2015
      Replying to @CopperheadOS

      @CopperheadSec Warning/error options, ubsan, etc. are nice tools for catching bad code. But the prob. is that ppl are being taught nonsense.

      1 reply 0 retweets 1 like
    3. CopperheadOS‏ @CopperheadOS 20 Nov 2015
      Replying to @RichFelker

      @RichFelker Projects truly aiming for correctness like SQLite are rare. Seems like laziness and lack of maintenance are the usual problems.

      1 reply 0 retweets 0 likes
    4. CopperheadOS‏ @CopperheadOS 20 Nov 2015
      Replying to @CopperheadOS

      @RichFelker It's certainly possible to write correct C code but a tiny fraction of C programmers are willing to put in the required effort.

      1 reply 0 retweets 1 like
    5. Rich Felker‏ @RichFelker 20 Nov 2015
      Replying to @CopperheadOS

      @CopperheadSec Most of the "effort" is just not copying bad code from other people's bad examples. Yes, a few things are actually hard, tho.

      1 reply 1 retweet 1 like
    6. Rich Felker‏ @RichFelker 20 Nov 2015
      Replying to @RichFelker

      @CopperheadSec If you learned C from scratch without reading broken code as examples, where would you learn aliasing was even possible?

      1 reply 0 retweets 0 likes
    7. CopperheadOS‏ @CopperheadOS 20 Nov 2015
      Replying to @RichFelker

      @RichFelker Trial and error with little concern towards whether it's safe. Or sites spreading lots of bad information like Stack Overflow.

      1 reply 0 retweets 0 likes
    8. Rich Felker‏ @RichFelker 20 Nov 2015
      Replying to @CopperheadOS

      @CopperheadSec SO information on C is generally very high quality; misinformation gets downvoted in a hurry & replaced by good info.

      1 reply 0 retweets 0 likes
    9. Rich Felker‏ @RichFelker 20 Nov 2015
      Replying to @RichFelker

      @CopperheadSec I'm not sure how "trial & error" would lead you to aliasing diff types without a preexisting idea of that "technique".

      1 reply 0 retweets 0 likes
    10. CopperheadOS‏ @CopperheadOS 20 Nov 2015
      Replying to @RichFelker

      @RichFelker Doing it via unions is an obvious technique but isn't really well-defined in C and is explicitly undefined in C++.

      2 replies 0 retweets 0 likes
      Rich Felker‏ @RichFelker 20 Nov 2015
      Replying to @CopperheadOS

      @CopperheadSec Yeah but all the decent docs on C tell you that the only member of a union you can access is the most-recently-stored one.

      11:38 PM - 20 Nov 2015
      1 reply 0 retweets 0 likes
        1. Rich Felker‏ @RichFelker 20 Nov 2015
          Replying to @RichFelker

          @CopperheadSec I concede that a newcomer to C could plausibly discover union-based aliasing via trial-and-error though.

          0 replies 0 retweets 0 likes
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