/lib/modules/3.19.0-21-generic/vdso/ is in linux-image-3.19.0-21-generic 3.19.0-21.21~14.04.1.
This file is owned by root:root, with mode 0o755.
..
/lib/modules/3.19.0-21-generic/vdso/.build-id/
/lib/modules/3.19.0-21-generic/vdso/.build-id/33/
/lib/modules/3.19.0-21-generic/vdso/.build-id/33/353f3820a309d8f975a20e4192af646a7e3db5.debug
/lib/modules/3.19.0-21-generic/vdso/.build-id/5d/
/lib/modules/3.19.0-21-generic/vdso/.build-id/5d/33611e2e3a381834645f3db9de02ff01ca1f75.debug
/lib/modules/3.19.0-21-generic/vdso/.build-id/9e/
/lib/modules/3.19.0-21-generic/vdso/.build-id/9e/ddedfb48c83182e4b89cdd471f8df45d4f9e09.debug
/lib/modules/3.19.0-21-generic/vdso/.build-id/c3/
/lib/modules/3.19.0-21-generic/vdso/.build-id/c3/4a51fa2cba97d222f6b9e62bbc3114036d0a8a.debug
/lib/modules/3.19.0-21-generic/vdso/.build-id/f4/
/lib/modules/3.19.0-21-generic/vdso/.build-id/f4/c84315fa9567b339a66d53a1f8df2d2c091849.debug
/lib/modules/3.19.0-21-generic/vdso/vdso32-int80.so
/lib/modules/3.19.0-21-generic/vdso/vdso32-syscall.so
/lib/modules/3.19.0-21-generic/vdso/vdso32-sysenter.so
/lib/modules/3.19.0-21-generic/vdso/vdso64.so
/lib/modules/3.19.0-21-generic/vdso/vdsox32.so