/usr/src/glibc/debian/patches/kfreebsd/ is in eglibc-source 2.15-0ubuntu10.
This file is owned by root:root, with mode 0o755.
..
/usr/src/glibc/debian/patches/kfreebsd/local-config_h_in.patch
/usr/src/glibc/debian/patches/kfreebsd/local-dosavesse.diff
/usr/src/glibc/debian/patches/kfreebsd/local-grantpt.diff
/usr/src/glibc/debian/patches/kfreebsd/local-linuxthreads29.diff
/usr/src/glibc/debian/patches/kfreebsd/local-memusage_no_mremap.diff
/usr/src/glibc/debian/patches/kfreebsd/local-nosavesse.diff
/usr/src/glibc/debian/patches/kfreebsd/local-pthread_at_fork.diff
/usr/src/glibc/debian/patches/kfreebsd/local-readdir_r.diff
/usr/src/glibc/debian/patches/kfreebsd/local-scripts.diff
/usr/src/glibc/debian/patches/kfreebsd/local-sys_queue_h.diff
/usr/src/glibc/debian/patches/kfreebsd/local-sysdeps.diff
/usr/src/glibc/debian/patches/kfreebsd/local-undef-glibc.diff
/usr/src/glibc/debian/patches/kfreebsd/local-use-thr-primitives.diff
/usr/src/glibc/debian/patches/kfreebsd/submitted-libc_once.diff