fixes #12791 - allow access to boot_files_uri and medium in safe_mode
(cherry picked from commit 1c81a696e4556ae3c17146afaff2fe6e2c52688d)
fixes #12791 - allow access to boot_files_uri and medium in safe_mode
(cherry picked from commit 1c81a696e4556ae3c17146afaff2fe6e2c52688d)