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Do cloud providers commonly float cores between VMs? I could see instances like the AWS T family (burstable) sharing, but I had always assumed that most instanc
by justryry 7y ago
Do cloud providers commonly float cores between VMs? I could see instances like the AWS T family (burstable) sharing, but I had always assumed that most instance types don't over-provision CPU.
If that's the case, my CPUs are likely pinned to my VM. I could still have evil userland apps spying on my own VM, but I would not expect this to allow other VMs to spy on mine.
- jupp0r 7y agoSharing CPUs is not the point, as long as you are sharing physical memory with other tenants, you are vulnerable (although exploits are much harder when attackers have to cross privilege boundaries).
- srfilipek 7y ago> Sharing CPUs is not the point, as long as you are sharing physical memory with other tenants, you are vulnerable Not to these vulnerabilities. These are attacking memory that is "in flight" within a processor.
- bayindirh 7y agoI don't think many cloud providers explicitly pin the VMs to the cores even if they don't over provision the servers.