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SubjectRe: [PATCH v6 03/11] mm, x86: Add support for eXclusive Page Frame Ownership (XPFO)
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At a high level, does this approach keep an attacker from being able to
determine the address of data in the linear map, or does it keep them
from being able to *exploit* it? Can you have a ret2dir attack if the
attacker doesn't know the address, for instance?

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