This file is indexed.

/var/lib/tex-common/fontmap-cfg/texlive/texlive-math-extra.cfg is in texlive-math-extra 2012.20120611-2.

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

The actual contents of the file can be viewed below.

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MixedMap yhmath.map
MixedMap stmaryrd.map