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Event-driven programming (EDP) is the prevalent paradigm for graphical userinterfaces, web clients, and it is rapidly gaining importance for server-sideand network programming. Central components of EDP are {\em event loops}, whichact as FIFO queues that are used by processes to store and dispatch messagesreceived from other processes.  In this paper we demonstrate that shared event loops are vulnerable toside-channel attacks, where a spy process monitors the loop usage pattern ofother processes by enqueueing events and measuring the time it takes for themto be dispatched. Specifically, we exhibit attacks against the two centralevent loops in Google's Chrome web browser: that of the I/O thread of the hostprocess, which multiplexes all network events and user actions, and that of themain thread of the renderer processes, which handles rendering and Javascripttasks.  For each of these loops, we show how the usage pattern can be monitored withhigh resolution and low overhead, and how this can be abused for maliciouspurposes, such as web page identification, user behavior detection, and covertcommunication.

Loophole: Timing Attacks on Shared Event Loops in Chrome