/usr/share/php/kohana3.1/system/classes/http/exception/ is in libkohana3.1-core-php 3.1.4-1.
This file is owned by root:root, with mode 0o755.
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/usr/share/php/kohana3.1/system/classes/http/exception/400.php
/usr/share/php/kohana3.1/system/classes/http/exception/401.php
/usr/share/php/kohana3.1/system/classes/http/exception/402.php
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/usr/share/php/kohana3.1/system/classes/http/exception/405.php
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/usr/share/php/kohana3.1/system/classes/http/exception/408.php
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/usr/share/php/kohana3.1/system/classes/http/exception/504.php
/usr/share/php/kohana3.1/system/classes/http/exception/505.php