Why Raspberry Pi Isn't Vulnerable to Spectre or Meltdown
This is great, but remember that it covers Meltdown, not Spectre. Meltdown is the more immediate disaster, but Spectre is the more batshit vulnerability. You <i>really</i> want to get your head around:<p>* The branch target injection variant of Spectre if you want to get a sense of how amazing this vulnerability is: you can spoof the branch predictor to trick a target process into running arbitrary code in its address space! This is crazy!<p>* The misprediction variant of Spectre if you want to get a hopeless feeling in the pit of your stomach, since the implications of mispredict are that certain <i>kinds</i> of programs are riddled with a new kind of side channel we didn't really grok until last week, and no upcoming microcode update seems to be in the offing.<p>You could probably use the same Python conceit to illustrate the other two attacks; someone might take a crack at that.<p>(I'm not disputing that the R-Pi's aren't vulnerable to Spectre).