无法通过su - oracle进行用户切换 su: incorrect password

问题描述：

[root@gasdbadm01 etc]# passwd oracle
Changing password for user oracle.

You can now choose the new password or passphrase.

A good password should be a mix of upper and lower case letters,
digits, and other characters.  You can use a 5 character long
password.


A passphrase should be of at least 3 words, 5 to 40 characters
long, and contain enough different characters.

Alternatively, if noone else can see your terminal now, you can
pick this as your password: "bumpy$turn=cart".

Enter new password: 
Re-type new password: 
passwd: all authentication tokens updated successfully.
[root@gasdbadm01 etc]# su - grid
[grid@gasdbadm01 ~]$ su - oracle
Password: 
su: incorrect password
[grid@gasdbadm01 ~]$

刚刚修改过密码却无法通过su - oracle进行用户切换

问题解决：

[root@gasdbadm01 etc]# ll /bin/su
-rwsr-xr-x 1 root root 34904 Aug 25  2014 /bin/su
[root@gasdbadm01 etc]# vim /etc/pam.d/su
-bash: vim: command not found
[root@gasdbadm01 etc]# vi !$
vi /etc/pam.d/su
[root@gasdbadm01 etc]# 
[root@gasdbadm01 etc]# cat /etc/pam.d/su
#%PAM-1.0
auth sufficient pam_rootok.so
# Uncomment the following line to implicitly trust users in the "wheel" group.
#auth sufficient pam_wheel.so trust use_uid
# Uncomment the following line to require a user to be in the "wheel" group.
# auth required pam_wheel.so use_uid
auth include system-auth
account sufficient pam_succeed_if.so uid = 0 use_uid quiet
account include system-auth
password include system-auth
session include system-auth
session optional pam_xauth.so
[root@gasdbadm01 etc]# 

将上面一行注释掉