[hashstring]

Both exploit Spectre V2, but in different ways. My takeaway:

Training Solo: - Enter the kernel (and switch privilege level) and “self train” to mispredict branches to a disclosure gadget, leak memory.

Branch predictor race conditions: - Enter the kernel while your trained branch predictor updates are still in flight, causing the updates to be associated with the wrong privilege level. Again, use this to redirect a branch in the kernel to a disclosure gadget, leak memory.