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If the hardware is designed to support single address space OSs it doesn't have be a security problem. It can help avoid spectre like problems because it can lo
by crest 3y ago
If the hardware is designed to support single address space OSs it doesn't have be a security problem. It can help avoid spectre like problems because it can lower the expected overhead of permission checks so far that there is no advantage of speculating on them instead of performing them.
- gpderetta 3y agoI think you are confusing meltdown (a speculation attack on hardware permission checks which was patched in later revisions of intel silicon and never affected other vendors) with Spectre, a general family of attacks on speculative execution, which are generally unsolved. You could of course add dedicated hardware to lower the overhead specifically of memory access permission checks. In fact most CPUs already do, it is called an MMU.