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kernel: x86/mm: Randomize per-cpu entry area [rhel-9]

Julia Denham requested to merge jdenham/centos-stream-9:RHELPLAN-147048 into main

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2165933
CVE: CVE-2023-0597

This backport addresses a security concern that the per-cpu entry points aren’t randomized. It adds a simple randomization scheme that avoids duplicates to spread the existing CPUs over the available space.

The below commits are included:
- a3f547addcaa10df5a226526bc9e2d9a94542344
- 97e3d26b5e5f371b3ee223d94dd123e6c442ba80
- 3f148f3318140035e87decc1214795ff0755757b

Signed-off-by: Julia Denham jdenham@redhat.com

Edited by Julia Denham

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