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OpenBSD 8.0 expands amd64 kernel virtual address space to 512G

marc.info 33 min read Editor score 7/10

OpenBSD 8.0 includes a 512G amd64 kernel virtual address space, randomized placement of the direct map, faster swap encryption, and arm64 hibernation support. The release offers concrete OS and security changes for systems engineers to assess.

What

OpenBSD 8.0 is a new release with changes across its supported platforms and kernel.

How

On amd64, it raises kernel virtual address space from 4G to 512G and randomizes the pmap direct-map location.

Why it matters

These platform-level changes are relevant to engineers building and operating large systems.

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