verify whether "su" has been replaced:
1. [root@sea root]# type su
su is /bin/su
2. [root@sea root]# rpm -qf /bin/su
coreutils-4.5.3-26
3. [root@sea root]# rpm --verify coreutils-4.5.3-26
S.5....T c /etc/pam.d/su
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in this case, i made some changes to /etc/pam.d/su before.
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