/lib/modules/4.2.0-21-generic/vdso/ is in linux-image-4.2.0-21-generic 4.2.0-21.25~14.04.1.
This file is owned by root:root, with mode 0o755.
..
/lib/modules/4.2.0-21-generic/vdso/.build-id/
/lib/modules/4.2.0-21-generic/vdso/.build-id/1a/
/lib/modules/4.2.0-21-generic/vdso/.build-id/1a/a22f06797af3ce9e254210345739033d448d40.debug
/lib/modules/4.2.0-21-generic/vdso/.build-id/93/
/lib/modules/4.2.0-21-generic/vdso/.build-id/93/19e2b1e6fc3c26023c46f5fe96d88faa4e2555.debug
/lib/modules/4.2.0-21-generic/vdso/.build-id/9c/
/lib/modules/4.2.0-21-generic/vdso/.build-id/9c/65b33b85b21793654e41ad6f75e8b3e1116abf.debug
/lib/modules/4.2.0-21-generic/vdso/.build-id/e0/
/lib/modules/4.2.0-21-generic/vdso/.build-id/e0/0c7bcf67a121f7e88a995115c862c19e60fff0.debug
/lib/modules/4.2.0-21-generic/vdso/.build-id/e1/
/lib/modules/4.2.0-21-generic/vdso/.build-id/e1/9e178e1dbbb4fd6c8176d29b89f0d7fe40a179.debug
/lib/modules/4.2.0-21-generic/vdso/vdso32-int80.so
/lib/modules/4.2.0-21-generic/vdso/vdso32-syscall.so
/lib/modules/4.2.0-21-generic/vdso/vdso32-sysenter.so
/lib/modules/4.2.0-21-generic/vdso/vdso64.so
/lib/modules/4.2.0-21-generic/vdso/vdsox32.so