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taviso's profile
Tavis Ormandy
Tavis Ormandy
Tavis Ormandy
Verified account
@taviso

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Tavis OrmandyVerified account

@taviso

Vulnerability researcher at Google. This is a personal stream, opinions expressed are mine.

California
taviso.decsystem.org
Joined April 2008

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    1. L. David Baron‏ @davidbaron 19 Dec 2018
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      Replying to @WithinRafael @taviso

      Having worked on browser engines, I don't think this is a straightforward example of poor code. There are many optimizations that the complexity of the web platform means you have to disable in more complex conditions. (1/?)

      1 reply 1 retweet 7 likes
    2. L. David Baron‏ @davidbaron 19 Dec 2018
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      Replying to @davidbaron @WithinRafael @taviso

      For example, if you're using some specialized video or graphics pipeline isn't designed to deal with other things on top of it (common), you'd need to test for the case of "things on top of it" and avoid using the optimization in that case. (2/?)

      1 reply 0 retweets 2 likes
    3. L. David Baron‏ @davidbaron 19 Dec 2018
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      Replying to @davidbaron @WithinRafael @taviso

      Then it just comes down to how sophisticated the test for overlapping content is. In this case, it sounds like it wasn't very sophisticated -- but it was probably still good enough to be an effective optimization on lots of sites. Worth improving, definitely. (3/?)

      1 reply 0 retweets 2 likes
    4. L. David Baron‏ @davidbaron 19 Dec 2018
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      Replying to @davidbaron @WithinRafael @taviso

      But I don't think failing to make a particular premature optimization (i.e., optimization without yet seeing the need for it) implies that somebody's code is bad. Graphics on the web has tons of performance cliffs; lots of folks teach these days about how to avoid Chrome's. 4/4

      1 reply 0 retweets 3 likes
    5. Tavis Ormandy‏Verified account @taviso 19 Dec 2018
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      Replying to @davidbaron @WithinRafael

      Yes, but the accusation was that this could have been caused by nothing except malice, which seems ridiculous. It seems like a very straightforward case of a slow path being triggered accidentally, I can think of a million innocent reasons I might want a placeholder div.

      3 replies 0 retweets 0 likes
    6. Manish‏ @ManishEarth 19 Dec 2018
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      Replying to @taviso @davidbaron @WithinRafael

      it's not the triggering of the performance cliff that's the problem here. That's fine, that happens all the time, that's because people aren't testing in Edge. The problem is not fixing it after it was reported.

      2 replies 0 retweets 2 likes
      Tavis Ormandy‏Verified account @taviso 20 Dec 2018
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      Replying to @ManishEarth @davidbaron @WithinRafael

      I think I disagree, the party with the bug should fix it - in this case Edge failed to handle valid and reasonable markup correctly, but rather than fix it asked for other people to workaround the bug. The website *did* change to accommodate them, and you still see a problem. 🤷‍♂️

      6:26 AM - 20 Dec 2018
      1 reply 0 retweets 0 likes
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        2. Manish‏ @ManishEarth 20 Dec 2018
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          Replying to @taviso @davidbaron @WithinRafael

          Edge handled the markup correctly, they just didn't optimizer it well. Here's a browser engineer saying why edge's optimization makes sense https://news.ycombinator.com/item?id=18703568 …

          1 reply 0 retweets 1 like
        3. Manish‏ @ManishEarth 20 Dec 2018
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          Replying to @ManishEarth @taviso and

          The original post seems to indicate that YouTube ignored them and gave no feedback. If this is false then it's fine. Of course it was eventually fixed, Google properties get redesigned every few months.

          1 reply 0 retweets 1 like
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