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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. Jonathan Grynspan‏ @grynspan 9 Aug 2017

      Always initialize your variables in C. It prevents a whole class of security and stability bugs. uid_t callerUID = 0; NO NO NO NO NO N—

      3 replies 92 retweets 154 likes
      Rich Felker‏ @RichFelker 11 Aug 2017
      Replying to @grynspan @thegrugq

      It also prevents the compiler from issuing a warning when you subsequently fail to fill in a meaningful value.

      5:18 AM - 11 Aug 2017
      • 1 Retweet
      • 4 Likes
      • reabstraction thunk golem Sami Kuhmonen Ingvar Stepanyan Dag-Erling Smørgrav Valentín Barros
      1 reply 1 retweet 4 likes
        1. New conversation
        2. Rich Felker‏ @RichFelker 11 Aug 2017
          Replying to @RichFelker @grynspan @thegrugq

          Unconventional opinion: unless there's a default value that's semantically correct, variables should never be initalized. Let -W* work.

          2 replies 2 retweets 8 likes
        3. Jonathan Grynspan‏ @grynspan 11 Aug 2017
          Replying to @RichFelker @thegrugq

          Non-portable (compiler warnings are not standard) and imperfect (compiler doesn’t always know if a variable gets initialized so can’t warn.)

          2 replies 0 retweets 0 likes
        4. Jonathan Grynspan‏ @grynspan 11 Aug 2017
          Replying to @grynspan @RichFelker @thegrugq

          Because use of an unintialized variable is UB, your program is then formally misspecified. Modern compilers go nuts when they see UB.

          1 reply 0 retweets 0 likes
        5. Jonathan Grynspan‏ @grynspan 11 Aug 2017
          Replying to @grynspan @RichFelker @thegrugq

          I agree that “always init” is reductionist but it is the best available option when constrained by the C standard. BUT.

          1 reply 0 retweets 0 likes
        6. Jonathan Grynspan‏ @grynspan 11 Aug 2017
          Replying to @grynspan @RichFelker @thegrugq

          The real root (heh!) of the problem is that uid_t and other security-sensitive types are just typedefs of int rather than non-scalar types.

          1 reply 0 retweets 3 likes
        7. Jonathan Grynspan‏ @grynspan 11 Aug 2017
          Replying to @grynspan @RichFelker @thegrugq

          This combined with making root 0 allows for this class of bug. UID 0 should be invalid, forcing a dev to be explicit when they mean root.

          0 replies 0 retweets 0 likes
        8. End of conversation

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