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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 16 Mar 2016

      If you really must write new C, use Clang with -Weverything -fsanitize=undefined from the start. Turn off the few non-applicable warnings.

      2 replies 29 retweets 57 likes
    2. CopperheadOS‏ @CopperheadOS 16 Mar 2016
      Replying to @CopperheadOS

      For brownie points, use -fsanitize=unsigned-integer-overflow too and mark the rare cases where overflow is intended using no_sanitize.

      2 replies 10 retweets 26 likes
    3. CopperheadOS‏ @CopperheadOS 16 Mar 2016
      Replying to @CopperheadOS

      Can then disable them in production builds if you need the performance, but they always make sense in the debug builds. It's cheap enough.

      1 reply 2 retweets 6 likes
    4. Rich Felker‏ @RichFelker 16 Mar 2016
      Replying to @CopperheadOS

      @CopperheadSec Not just for performance. Sanitizer libs add gaping vulnerabilities and are not suitable for production use.

      1 reply 0 retweets 2 likes
    5. CopperheadOS‏ @CopperheadOS 17 Mar 2016
      Replying to @RichFelker

      @RichFelker The undefined sanitizer is fine when it's set to the production mode (-fsanitize-undefined-trap-on-error). Just branches to ud2.

      2 replies 1 retweet 2 likes
      Rich Felker‏ @RichFelker 17 Mar 2016
      Replying to @CopperheadOS

      @CopperheadSec Yes but you need to be clear about this because plenty of people don't understand and will add huge attack surface/vulns.

      8:48 AM - 17 Mar 2016
      • 1 Retweet
      • Jonas Termansen
      1 reply 1 retweet 0 likes
        1. New conversation
        2. Jonas Termansen‏ @sortiecat 17 Mar 2016
          Replying to @RichFelker

          @RichFelker @CopperheadSec It would be better if the non-abort-immediately-mode was default, and the unsafe sanitizer libraries were opt in

          1 reply 1 retweet 1 like
        3. Jonas Termansen‏ @sortiecat 17 Mar 2016
          Replying to @sortiecat

          @RichFelker @CopperheadSec Harder to recommend when “Use -fsanitizer=undefined, but make sure to -fsanitizer-undefined-trap-on-error”

          1 reply 1 retweet 1 like
        4. CopperheadOS‏ @CopperheadOS 17 Mar 2016
          Replying to @sortiecat

          @sortiecat @RichFelker It's a debugging feature first and a hardening feature second though. Only a subset is truly useful for hardening.

          2 replies 0 retweets 2 likes
        5. CopperheadOS‏ @CopperheadOS 17 Mar 2016
          Replying to @CopperheadOS

          @sortiecat @RichFelker Other sanitizers don't have a production mode at all and UBSan is focused on accurate debugging rather than speed.

          1 reply 0 retweets 0 likes
        6. CopperheadOS‏ @CopperheadOS 17 Mar 2016
          Replying to @CopperheadOS

          @sortiecat @RichFelker It would be possible to offer better performance by using lazy rather than strict checks. Trigger on use of results.

          1 reply 0 retweets 0 likes
        7. 1 more reply

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