安装完Oracle 11G R 2之后，sqlplus / as sysdba 的时候报如下的错误

sqlplus: error while loading shared libraries: /u01/app/oracle/product/11.2.0/dbhome_1/lib/libclntsh.so.11.1: cannot restore segment prot after reloc: Permission denied

原因：安装 Oracle 之前配置Linux的时候忘记了SELINUX设置为display了。

方法： 以root身份 vi /etc/sysconfig/selinux 如下图：

# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
#       enforcing - SELinux security policy is enforced.
#       permissive - SELinux prints warnings instead of enforcing.
#       disabled - SELinux is fully disabled.
SELINUX=disabled
# SELINUXTYPE= type of policy in use. Possible values are:
#       targeted - Only targeted network daemons are protected.
#       strict - Full SELinux protection.
SELINUXTYPE=targeted

把上面的SELINUX=enforcing,改为SELINUX=disabled

然后重启即可。