error while loading shared libraries: $ORACLE_HOME/lib/libnnz10.so: cannot restore segment prot after reloc: Permission denied
最后的Permission denied显示，初步认为是系统安全屏蔽了oracle执行某些执行动作。于是检查系统防火墙iptables，已经关闭，于是想到了Selinux，
[root@localhost ~]# more /etc/sysconfig/selinux
# 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=enforcing
# SELINUXTYPE= type of policy in use. Possible values are:
# targeted - Only targeted network daemons are protected.
# strict - Full SELinux protection.
SELINUXTYPE=targeted
看来是selinux的缘故，关掉selinux试试！
修改SELINUX=disabled，然后重启系统才能生效，或者执行：setenforce 0，立即生效。
果然，关闭selinux后，sqlplus可以正常登陆了。
其实在上面出现Permission denied时，也可以执行
#chcon -t texrel_shlib_t $ORACLE_HOME/lib/*.so
问题也可以得到解决，至于chcon可以看看selinux方面的命令即可明白了！