Speculative Dereferencing of Registers: Reviving Foreshadow [pdf]
A thought just came to my mind.  Let's say 30 years ago, I said to a colleague with whom I shared accesses to some Unix systems, "You know, I can use 'ps' to see what processes you are running.  If I know the details about certain flaws of those binaries, I may be able to run a custom binary simultaneously on the system and figure out some of your data!"  Would he/she be surprised or alarmed?