[Bug 297354] reading from /dev/mem panics on arm64

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=297354

            Bug ID: 297354
           Summary: reading from /dev/mem panics on arm64
           Product: Base System
           Version: 15.1-RELEASE
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: arm
          Assignee: [email protected]
          Reporter: [email protected]

Created attachment 273552
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=273552&action=edit
panic screenshot

`dd if=/dev/mem of=/dev/null bs=1m` on an ARM64 cloud VM panics. The screenshot
of the panic is attached. It seems we're hitting a TODO section in arm64
pmap.c.

There's bug 383 from year 1995, where the resolution is "don't read from random
regions of /dev/mem", but from 2026, it seems that userspace should not be able
to panic the kernel so easily.

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