So wie ich das Verstehe, ist doch AMD und ARM möglicherweise auch von Meltdown betroffen. Die Forscher wissen bislang nur nicht, ob bspw. ihre Implementierung der Attacke nicht zu langsam ist und es mit einer schnelleren nicht doch durchfürbar wäre, siehe hier:
We also tried to reproduce the Meltdown bug on several ARM and AMD CPUs. However, we did not manage to successfully leak kernel memory with the attack described in Section 5, neither on ARM nor on AMD. Thereasons for this can be manifold. First of all, our implementation might simply be too slow and a more optimized version might succeed. For instance, a more shallowout-of-order execution pipeline could tip the racecondition towards against the data leakage. Similarly, if the processor lacks certain features, e.g., no re-orderbuffer, our current implementation might not be able to leak data. However, for both ARM and AMD, the toy example as described in Section 3 works reliably, indicating that out-of-order execution generally occurs and instructions past illegal memory accesses are also performed.
