ZombieLoad: Cross Privilege-Boundary Data Leakage on Intel CPUs

Re:ZombieLoad: Cross Privilege-Boundary Data Leakage on Inte... by bitL on Tuesday May 14, 2019 @05:36PM (#19914117)

They have different cache architectures; Intel uses inclusive (i.e. all levels contain keys from previous levels), AMD uses exclusive cache (each level contains unrelated entries to any other level). This might have different effects on classes of vulnerabilities they are prone to.

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Re:ZombieLoad: Cross Privilege-Boundary Data Leakage on Inte... by TomVDB on Tuesday May 14, 2019 @06:11PM (#19914339)

I know that some AMD CPUs a long time ago had exclusive caches, but for Ryzen, I'm pretty sure that both L1 and L2 are inclusive, and L3 a victim cache.

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Re:ZombieLoad: Cross Privilege-Boundary Data Leakage on Inte... by redrabbyte on Wednesday May 15, 2019 @06:26PM (#19924393)

the inclusivity types don't really play a role in these types of attack (until you get to a very practical stage where this might matter), not least because there are other sidechannels that can be exploited. an inclusive llc is just convenient.

that said, some newer Intel LLCs are non-inclusive, and amd changed its cache relations as well in ryzen

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