sudo: Valid user ID not 0,sudo belongs to root and set setuid bit

Meet this problem should check sudo file owner name

---x--x--x. 1 CMP CMP 130720 sudo

The obvious owner has a problem.

Chown Root:root/usr/bin/sudo

chmod 4755/usr/bin/sudo

Sudo is executed again, and a hint appears

/usr/libexec/sudoers.so Valid User ID is not 0

Check that the sudoers.so file has

Ls/usr/libexec/sudoers.so-al
-rw-r--r--. 1 CMP CMP 333624 11 2015/usr/libexec/sudoers.so

have obvious problems and make changes

Chown root:root/usr/libexec/sudoers.so
Ls/usr/libexec/sudoers.so-al
-rw-r--r--. 1 root root 333624 11 2015/usr/libexec/sudoers.so

In this run sudo, all normal, virtual machine configuration of Linux often occur such problems, the file owner in the virtual machine is CMP, need special attention.

sudo: Valid user ID not 0,sudo belongs to root and set setuid bit