/usr/share/postgresql/10/extension/pg_buffercache--1.1--1.2.sql is in postgresql-10 10.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | /* contrib/pg_buffercache/pg_buffercache--1.1--1.2.sql */
-- complain if script is sourced in psql, rather than via ALTER EXTENSION
\echo Use "ALTER EXTENSION pg_buffercache UPDATE TO '1.2'" to load this file. \quit
ALTER FUNCTION pg_buffercache_pages() PARALLEL SAFE;
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