/usr/share/php/Symfony/Component/Validator/Mapping/ is in php-symfony-validator 2.7.10-0ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/Symfony/Component/Validator/Mapping/BlackholeMetadataFactory.php
/usr/share/php/Symfony/Component/Validator/Mapping/Cache/
/usr/share/php/Symfony/Component/Validator/Mapping/Cache/ApcCache.php
/usr/share/php/Symfony/Component/Validator/Mapping/Cache/CacheInterface.php
/usr/share/php/Symfony/Component/Validator/Mapping/Cache/DoctrineCache.php
/usr/share/php/Symfony/Component/Validator/Mapping/CascadingStrategy.php
/usr/share/php/Symfony/Component/Validator/Mapping/ClassMetadata.php
/usr/share/php/Symfony/Component/Validator/Mapping/ClassMetadataFactory.php
/usr/share/php/Symfony/Component/Validator/Mapping/ClassMetadataInterface.php
/usr/share/php/Symfony/Component/Validator/Mapping/ElementMetadata.php
/usr/share/php/Symfony/Component/Validator/Mapping/Factory/
/usr/share/php/Symfony/Component/Validator/Mapping/Factory/BlackHoleMetadataFactory.php
/usr/share/php/Symfony/Component/Validator/Mapping/Factory/LazyLoadingMetadataFactory.php
/usr/share/php/Symfony/Component/Validator/Mapping/Factory/MetadataFactoryInterface.php
/usr/share/php/Symfony/Component/Validator/Mapping/GenericMetadata.php
/usr/share/php/Symfony/Component/Validator/Mapping/GetterMetadata.php
/usr/share/php/Symfony/Component/Validator/Mapping/Loader/
/usr/share/php/Symfony/Component/Validator/Mapping/Loader/AbstractLoader.php
/usr/share/php/Symfony/Component/Validator/Mapping/Loader/AnnotationLoader.php
/usr/share/php/Symfony/Component/Validator/Mapping/Loader/FileLoader.php
/usr/share/php/Symfony/Component/Validator/Mapping/Loader/FilesLoader.php
/usr/share/php/Symfony/Component/Validator/Mapping/Loader/LoaderChain.php
/usr/share/php/Symfony/Component/Validator/Mapping/Loader/LoaderInterface.php
/usr/share/php/Symfony/Component/Validator/Mapping/Loader/StaticMethodLoader.php
/usr/share/php/Symfony/Component/Validator/Mapping/Loader/XmlFileLoader.php
/usr/share/php/Symfony/Component/Validator/Mapping/Loader/XmlFilesLoader.php
/usr/share/php/Symfony/Component/Validator/Mapping/Loader/YamlFileLoader.php
/usr/share/php/Symfony/Component/Validator/Mapping/Loader/YamlFilesLoader.php
/usr/share/php/Symfony/Component/Validator/Mapping/Loader/schema/
/usr/share/php/Symfony/Component/Validator/Mapping/Loader/schema/dic/
/usr/share/php/Symfony/Component/Validator/Mapping/Loader/schema/dic/constraint-mapping/
/usr/share/php/Symfony/Component/Validator/Mapping/Loader/schema/dic/constraint-mapping/constraint-mapping-1.0.xsd
/usr/share/php/Symfony/Component/Validator/Mapping/MemberMetadata.php
/usr/share/php/Symfony/Component/Validator/Mapping/MetadataInterface.php
/usr/share/php/Symfony/Component/Validator/Mapping/PropertyMetadata.php
/usr/share/php/Symfony/Component/Validator/Mapping/PropertyMetadataInterface.php
/usr/share/php/Symfony/Component/Validator/Mapping/TraversalStrategy.php