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j00ru's profile
j00ru//vx
j00ru//vx
j00ru//vx
@j00ru

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j00ru//vx

@j00ru

Windows hacker & vulnerability researcher. Google Project Zero. @DragonSectorCTF

Poland
j00ru.vexillium.org
Joined April 2010

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    1. j00ru//vx‏ @j00ru Apr 30

      My Infiltrate slides about recent progress in Windows kernel infoleak detection: http://j00ru.vexillium.org/slides/2018/infiltrate.pdf … Topics covered: • Windows x64 instrumentation • Leaks to file systems • Double-write conditions • Visual Studio .pdb heap disclosure

      2 replies 296 retweets 507 likes
    2. grsecurity‏ @grsecurity May 1
      Replying to @j00ru

      Probably didn't find anything in the typical Linux userland interface because ~2013 we did some similar instrumentation to make some leaks fall out - modified the magic for STACKLEAK/SANITIZE to a value we told a fuzzer to never provide to the kernel,inspected copy_to_user for it

      5 replies 3 retweets 11 likes
    3. j00ru//vx‏ @j00ru May 2
      Replying to @grsecurity

      Always one step ahead! :) It's surely one of the reasons I didn't have an easy time hunting for Linux infoleaks. Is this effort documented somewhere publicly so that I can cite it properly?

      1 reply 0 retweets 4 likes
    4. grsecurity‏ @grsecurity May 2
      Replying to @j00ru

      Nothing citable in public, this was the first time I mentioned it to the full public. I had also mentioned in the QA part of @paxteam's 2013 talk on our GCC plugins at the private? Sacicon before H2HC

      2 replies 0 retweets 1 like
    5. grsecurity‏ @grsecurity May 2
      Replying to @grsecurity @j00ru @paxteam

      Just one of the many things we do without talking much (or at all) about it. For some more history, around that same time @jvanegue was being persistent in viewing SIZE_OVERFLOW in terms of how many bugs it found -- when the answer (same as in your case) is however many...

      1 reply 0 retweets 1 like
    6. grsecurity‏ @grsecurity May 2
      Replying to @grsecurity @j00ru and

      grsecurity Retweeted Julien Vanegue

      you can trigger via a fuzzer (https://twitter.com/jvanegue/status/373212998091161601 … etc). At Sacicon we fully explained it and he finally got it, and I also mentioned how we were repurposing other plugins for the same bug-finding goal. He thought it was novel and we should write a paper about it...

      grsecurity added,

      Julien Vanegue @jvanegue
      @grsecurity yeah, i just like to evaluate tools on ability to find real counter-examples, not just the coverage they bring. So how many?
      2 replies 0 retweets 1 like
    7. Julien Vanegue‏ @jvanegue May 2
      Replying to @grsecurity @j00ru @paxteam

      did you really dig up a 2013 tweet to justify your point and throw me under the bus all at once? Nicely done

      1 reply 0 retweets 0 likes
    8. grsecurity‏ @grsecurity May 2
      Replying to @jvanegue @j00ru @paxteam

      I was providing the historical context (that you could vouch for, since there's no public mention of it). I didn't know that mentioning something you were adamant about in public constitutes 'throwing under the bus', but it is true that you've been hostile ever since being wrong

      1 reply 0 retweets 0 likes
    9. Julien Vanegue‏ @jvanegue May 2
      Replying to @grsecurity @j00ru @paxteam

      what kind of wrongness you borrow me from back then I don't know! I just recall a friendly meeting in Sao Paulo

      1 reply 0 retweets 0 likes
    10. Julien Vanegue‏ @jvanegue May 2
      Replying to @jvanegue @grsecurity @paxteam

      I am open and even enjoy being wronged, that's how I learn. No need to make it personal. Also, great work @j00ru !

      1 reply 0 retweets 1 like
      j00ru//vx‏ @j00ru May 3
      Replying to @jvanegue @grsecurity @paxteam

      Thanks Julien!

      2:31 AM - 3 May 2018
      0 replies 0 retweets 0 likes

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