This is cool – I just heard a talk related to this subject from one of the authors, Daniel Genkin, who leads the group [0] that found this vulnerability. Seems like they're doing a lot of really interesting work. The talk I heard was specifically about "iLeakage", another vulnerability they found where an attacker can read another tab's data using something like Spectre.
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[ 5.7 ms ] story [ 22.3 ms ] thread[0]: https://architecture.fail/
[1]: https://ileakage.com/
Discussion on the actual vulnerability post: https://news.ycombinator.com/item?id=39779195