sh-3.2$ ln /bin/ping /var/tmp/exploit/target
ln: creating hard link `/var/tmp/exploit/target' to `/bin/ping': Invalid cross-device link

sh-3.2$ ls -la /lib/libc*;ls -la /lib/libpc*;ls -la /lib/libme*;df -h;
-rwxr-xr-x 1 root root 1693812 Apr  8 08:44 /lib/libc-2.5.so
lrwxrwxrwx 1 root root      11 Aug  4 13:25 /lib/libc.so.6 -> libc-2.5.so
-rwxr-xr-x 1 root root  191708 Apr  8 08:44 /lib/libcidn-2.5.so
lrwxrwxrwx 1 root root      14 Aug  4 13:25 /lib/libcidn.so.1 -> libcidn-2.5.so
lrwxrwxrwx 1 root root      17 Aug  4 13:25 /lib/libcom_err.so.2 -> libcom_err.so.2.1
-rwxr-xr-x 1 root root    6364 May  3 16:27 /lib/libcom_err.so.2.1
-rwxr-xr-x 1 root root   45432 Apr  8 08:44 /lib/libcrypt-2.5.so
lrwxrwxrwx 1 root root      15 Aug  4 13:25 /lib/libcrypt.so.1 -> libcrypt-2.5.so
-rwxr-xr-x 1 root root 1295616 May  4 05:38 /lib/libcrypto.so.0.9.8e
lrwxrwxrwx 1 root root      19 Aug  4 13:25 /lib/libcrypto.so.6 -> libcrypto.so.0.9.8e
lrwxrwxrwx 1 root root     16 Mar 10  2011 /lib/libpcre.so.0 -> libpcre.so.0.0.1
-rwxr-xr-x 1 root root 127760 Mar  1  2011 /lib/libpcre.so.0.0.1
ls: /lib/libme*: No such file or directory
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup00-root
                      4.8G  3.5G  1.1G  76% /
/dev/sda1             487M   31M  431M   7% /boot
tmpfs                 3.9G     0  3.9G   0% /dev/shm
/dev/sda3             487M   54M  409M  12% /tmp
/dev/mapper/VolGroup00-var
                      387G  316G   56G  86% /var