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tehjh's profile
Jann Horn
Jann Horn
Jann Horn
@tehjh

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Jann Horn

@tehjh

works at Google Project Zero. personal account.

Joined August 2011

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    1. halvarflake‏ @halvarflake 8 Feb 2018
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      I don't think I will ever reach the point where I can read a paper that assigns most credit for ROP to the 2007 Shacham paper, and that harps on at length about "Turing-completeness", without my blood pressure rising.

      1 reply 6 retweets 24 likes
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    2. halvarflake‏ @halvarflake 8 Feb 2018
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      "Turing-completeness" is a misnomer in this context to begin with. Sending Javascript to a Browser is Turing-complete, and rendering Postscript is. "Can achieve any memory layout" is not as snazzy to say, I get it, but that doesn't make "Turing complete" any more correct.

      4 replies 4 retweets 16 likes
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    3. grsecurity‏ @grsecurity 8 Feb 2018
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      Replying to @halvarflake

      I think "can achieve any memory layout" isn't enough to describe privilege escalation (absent something application-specific), but might be sufficient to describe privilege abuse

      1 reply 0 retweets 0 likes
    4. halvarflake‏ @halvarflake 8 Feb 2018
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      Replying to @grsecurity

      Fair.

      1 reply 0 retweets 0 likes
    5. grsecurity‏ @grsecurity 8 Feb 2018
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      Replying to @halvarflake

      It's a hold-over from thinking that the be-all end-all of exploitation is turing completeness (doesn't account for syscalls, immutable page protections, inability to introduce new machine code, etc) -- does your FSM-view take it into account?

      1 reply 0 retweets 1 like
    6. halvarflake‏ @halvarflake 8 Feb 2018
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      Replying to @grsecurity

      It does, to the extent that syscalls etc. represent communication from one machine to the next. While I think you can guarantee next to nothing about the corrupt process (especially in multi-thread situations), you *can* guarantee some things about how it communicates.

      1 reply 0 retweets 0 likes
    7. halvarflake‏ @halvarflake 8 Feb 2018
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      Replying to @halvarflake @grsecurity

      End-all-and-be-all of exploitation is violating a security boundary. If they are in-process, and data-driven, defending them in presence of memory corruption is a losing game. Out-of-process is a very different animal.

      1 reply 0 retweets 0 likes
    8. halvarflake‏ @halvarflake 8 Feb 2018
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      Replying to @halvarflake @grsecurity

      So if you ask me: Do multiple small processes communicating over a very restricted interface seem saner than the current model? Hell yeah.

      1 reply 0 retweets 0 likes
    9. halvarflake‏ @halvarflake 8 Feb 2018
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      Replying to @halvarflake @grsecurity

      I will be the first one to say that seccomp strict mode is a tremendously useful and powerful primitive :-)

      2 replies 0 retweets 2 likes
      Jann Horn‏ @tehjh 8 Feb 2018
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      Replying to @halvarflake @grsecurity

      ... which nobody uses :P

      5:31 AM - 8 Feb 2018
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      • scriptjunkie Travis Normandy
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