glibc: ld.so insecure handling of privileged programs' RPATHs with $ORIGIN

ld.so in the GNU C Library aka glibc or libc6 2.13 and earlier expands the $ORIGIN dynamic string token when RPATH is composed entirely of this token, which might allow local users to gain privileges by creating a hard link in an arbitrary directory to a 1 setuid or 2 setgid program with this RPA...