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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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    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 :/

    1:00 PM - 17 Jun 2016
    • 6 Likes
    • John Regehr Pawel Wylecial Suto Wireghoul Greg Linares
    2 replies 0 retweets 6 likes
      1. New conversation
      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
      4. 𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever 17 Jun 2016
        Replying to @berendjanwever

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

        2 replies 0 retweets 0 likes
      5. 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
      6. 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
      7. 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
      8. 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
      9. End of conversation
      1. New conversation
      2. Magnus K. Stubman‏ @magnusstubman 17 Jun 2016
        Replying to @berendjanwever

        Which lib are you fuzzing?

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

        lib? I'm fuzzing the DOM, this last bug appears to be in style sheet handling guessing from the function it crashed in.

        1 reply 0 retweets 1 like
      4. Magnus K. Stubman‏ @magnusstubman 17 Jun 2016
        Replying to @berendjanwever

        which fuzzer do you use?

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

        self written from scratch.

        0 replies 0 retweets 0 likes
      6. End of conversation

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