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berendjanwever's profile
𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹
𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹
𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹
@berendjanwever

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𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹

@berendjanwever

ASCII art evangelist | motivational coder | full stack IoT blockchain machine learning cyber-cloud threat actor | berendj@nwever.nl | http://skylined.nl/gpg 

 🇳🇱 The Netherlands
blog.skylined.nl
Joined June 2009

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    1. 𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever 17 Jun 2016

      Argh! I keep finding Firefox using pointers from poisoned memory, only to see them stop reproducing while I try to reduce the repro :/

      2 replies 0 retweets 6 likes
    2. 𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever 17 Jun 2016
      Replying to @berendjanwever

      this has happened ~3 times this year alone - each time with what appears to be a different root cause... driving me nuts!

      1 reply 0 retweets 1 like
    3. 𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever 17 Jun 2016
      Replying to @berendjanwever

      Maybe reducing the repro is causing it to collect garbage at a different (later) time, reducing the likelihood of a crash.

      2 replies 0 retweets 2 likes
      𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever 17 Jun 2016

      finer control of garbage collection would solve that (i.e. window.CollectGarbage in MSIE), but Firefox doesn't have that

      1:25 PM - 17 Jun 2016
      2 replies 0 retweets 0 likes
        1. New conversation
        2. Cedric Halbronn‏ @saidelike 21 Jun 2016
          Replying to @berendjanwever

          can't you compile your own version of Firefox with a custom gc()? Not sure how easy it would be though

          1 reply 0 retweets 0 likes
        3. 𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever 21 Jun 2016
          Replying to @saidelike

          I'm looking for a zero maintenance solution; having to build new versions of browsers myself is far from that in my experience.

          2 replies 0 retweets 0 likes
        4. Joshua J. Drake‏ @jduck 21 Jun 2016
          Replying to @berendjanwever @saidelike

          why not inject (dynamic instrumentation) a new method to call the gc?

          1 reply 0 retweets 1 like
        5. 𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever 21 Jun 2016
          Replying to @jduck @saidelike

          that'd be cool. do you have some sample code that I could tweak to achieve it? or else pointers on how you'd do it?

          1 reply 0 retweets 0 likes
        6. Joshua J. Drake‏ @jduck 21 Jun 2016
          Replying to @berendjanwever @saidelike

          How about modify Math.Atan to call CollectGarbage ??

          1 reply 0 retweets 0 likes
        7. 𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever 21 Jun 2016
          Replying to @jduck @saidelike

          I get what you are trying to do, but I've not done dynamic patching in about ten years, I'm not sure what framework to use

          3 replies 0 retweets 0 likes
        8. 𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever 21 Jun 2016
          Replying to @berendjanwever @jduck @saidelike

          hence my question if you had some example code that I could modify to do something like what you're describing

          2 replies 0 retweets 0 likes
        9. Francisco Dominguez‏ @FSDominguez 21 Jun 2016
          Replying to @berendjanwever @jduck @saidelike

          not sure if the best fit, but maybe winappdbg? Or PIN from intel? Don't have example src, sorry.

          0 replies 0 retweets 0 likes
        10. End of conversation
        1. New conversation
        2. Dan Veditz‏ @dveditz 17 Jun 2016
          Replying to @berendjanwever

          build and install https://github.com/MozillaSecurity/funfuzz/tree/master/dom/extension …, all kinds of GC control. Won't help an exploit but valid for bounties.

          1 reply 1 retweet 3 likes
        3. 𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever 17 Jun 2016
          Replying to @dveditz

          I tried that earlier but couldn't get it to work. looking for something that takes 5 mins to integrate to existing fuzzing.

          2 replies 0 retweets 0 likes
        4. 𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever 17 Jun 2016
          Replying to @berendjanwever @dveditz

          rather than setup Firefox build environment, build that, get it installed on my bots and use it in my fuzzers.

          1 reply 0 retweets 0 likes
        5. 𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever 17 Jun 2016
          Replying to @berendjanwever @dveditz

          (my experience of that there prolly won't be docs but there will be weird errors and inexplicable failures, so it'll take a week)

          0 replies 0 retweets 0 likes
        6. End of conversation

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