Use ldd para verificar bibliotecas vinculadas, por exemplo:
$ ldd $(which whoami)
linux-vdso.so.1 => (0x00007fff00bfe000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fa25f48e000)
/lib64/ld-linux-x86-64.so.2 (0x00007fa25f871000)
Não se preocupe se você não encontrar o linux-vdso em seu sistema, veja por exemplo :
The library that you see as linux-vdso.so.1 is a virtual library or Virtual Dynamic Shared Object, that resides only in each program's address space. Older systems called this linux-gate.so.1. This virtual library provides the necessary logic to allow user programs to access system functions through the fastest means available on the particular processor, either interrupt, or with most newer processors, fast system call.