This file is indexed.

/usr/share/seccomp/policygroups/ubuntu-core/16.04/physical-memory-access is in ubuntu-core-security-seccomp 16.04.15.1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# Description: Can access physical memory on the device.
# Usage: reserved