title: Flush & Reload cache side channel attack
body: <p>I'm trying to understand the Flush + Reload cache side channel attack.
  As long as I know, the attack utilize the fact that unprivileged data could be loaded to the cache (when exploiting branch prediction, speculative execution, etc). Then, the attacker use a probe array in order to access a memory, memory which is loaded fast assumed to be on the cache (part of the secret data).</p>
  <p>One thing which I find it unclear is how does the attacker is able to iterate through virtual memory which is unprivileged memory? For example - iterating on kernel virtual memory or other processes' memory.</p>