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how do Meltdown & Spectre exploit the memory hierarchy? - Spatial locality: by measuring which user - space memory access takes less time, these attacks

how do Meltdown & Spectre exploit the memory hierarchy?
-Spatial locality: by measuring which user-space memory access takes less time, these attacks can read values in memory near a kernel-space memory address
- Temporal locality: by measuring which user-space memory access takes less time, these attacks can determine the value at a kernel-space memory address
- Cache coherency: by measuring the differences in the values between two caches, these attacks can determine which kernel-space addresses were updated

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