security things in Linux v4.12

Previously: v4.11. x86 read-only and fixed-location GDT With kernel memory base randomization, it was stil possible to figure out the per-cpu base address via the “sgdt” instruction, since it would reveal the per-cpu GDT location. To solve this, Thomas Garnier moved the GDT to a fixed location. And to solve the risk of an attacker targeting the GDT directly with a kernel bug, he also made it read-only.

Link: security things in Linux v4.12
via outflux.net

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