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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. Rich Felker‏ @RichFelker Jan 7

      Can malicious ad js be fixed (from publisher perspective) by fetching & interpreting it with an interpreter written in js rather than directly executing it in the browser?

      2 replies 0 retweets 0 likes
      Show this thread
    2. Robert Ou‏ @rqou_ Jan 7
      Replying to @RichFelker

      Probably not because *mumble* *mumble* halting problem

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker Jan 7
      Replying to @rqou_

      Halting problem is irrelevant. A pure functional language is Turing-equivalent but harmless because it has no side effects.

      5:26 PM - 7 Jan 2018
      2 replies 0 retweets 0 likes
        1. Rich Felker‏ @RichFelker Jan 7
          Replying to @RichFelker @rqou_

          The question is more whether you can virtualize the browser js environment appropriately.

          0 replies 0 retweets 0 likes
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        1. New conversation
        2. Robert Ou‏ @rqou_ Jan 7
          Replying to @RichFelker

          I suppose it depends on what exactly you want to protect against. On one hand you can have "may only have an animated image with no JS" and on the other hand you have RowhammerJS/SpectreJS which would be difficult to defend against

          1 reply 0 retweets 0 likes
        3. Rich Felker‏ @RichFelker Jan 7
          Replying to @rqou_

          Um, blocking rowhammer is trivial. If you implement the vm you can limit store rate however you like.

          1 reply 0 retweets 0 likes
        4. Rich Felker‏ @RichFelker Jan 7
          Replying to @RichFelker @rqou_

          And if you detected anything nasty, you just abort loading the ad and switch to trying load from a different ad network.

          1 reply 0 retweets 0 likes
        5. Rich Felker‏ @RichFelker Jan 7
          Replying to @RichFelker @rqou_

          Force the networks to compete on not getting aborted for bad js behavior.

          1 reply 0 retweets 0 likes
        6. Robert Ou‏ @rqou_ Jan 7
          Replying to @RichFelker

          Are you proposing always running the ad JS through the interpreter (as opposed to trying to check for bad behavior ahead of time)? I think this is possible in theory, but there's no real incentive for a site to do this.

          1 reply 0 retweets 0 likes
        7. Rich Felker‏ @RichFelker Jan 7
          Replying to @rqou_

          Rich Felker Retweeted Anil Dash

          Sure there is. See:https://twitter.com/anildash/status/950097073478819841 …

          Rich Felker added,

          Spam popup
          Anil DashVerified account @anildash
          It’s exciting to see every major media outlet covering this same important story on their mobile websites. pic.twitter.com/keXPRSLgpv
          Show this thread
          2 replies 0 retweets 0 likes
        8. Rich Felker‏ @RichFelker Jan 7
          Replying to @RichFelker @rqou_

          And yes, always through the interpreter. Abort & try a different ad as soon as it breaks the rules.

          0 replies 0 retweets 0 likes
        9. End of conversation

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