/lib/modules/3.19.0-31-generic/vdso/ is in linux-image-3.19.0-31-generic 3.19.0-31.36~14.04.1.
This file is owned by root:root, with mode 0o755.
..
/lib/modules/3.19.0-31-generic/vdso/.build-id/
/lib/modules/3.19.0-31-generic/vdso/.build-id/85/
/lib/modules/3.19.0-31-generic/vdso/.build-id/85/6d0421d791e8988612f803265e9b01ab3973df.debug
/lib/modules/3.19.0-31-generic/vdso/.build-id/9e/
/lib/modules/3.19.0-31-generic/vdso/.build-id/9e/79db581b5fa0b2a60501ab6f3f56f6e4673bbb.debug
/lib/modules/3.19.0-31-generic/vdso/.build-id/a2/
/lib/modules/3.19.0-31-generic/vdso/.build-id/a2/0aee952f6c682e90690ee2c85648993a130f4d.debug
/lib/modules/3.19.0-31-generic/vdso/.build-id/cb/
/lib/modules/3.19.0-31-generic/vdso/.build-id/cb/6ad1eb68bacaf5fc2af988f782b17cfb3874bc.debug
/lib/modules/3.19.0-31-generic/vdso/.build-id/de/
/lib/modules/3.19.0-31-generic/vdso/.build-id/de/a1ed4fb6e630639eeca5e8ec49bf63c2aba964.debug
/lib/modules/3.19.0-31-generic/vdso/vdso32-int80.so
/lib/modules/3.19.0-31-generic/vdso/vdso32-syscall.so
/lib/modules/3.19.0-31-generic/vdso/vdso32-sysenter.so
/lib/modules/3.19.0-31-generic/vdso/vdso64.so
/lib/modules/3.19.0-31-generic/vdso/vdsox32.so