SELinux: Could not downgrade policy file

淩亂°似流年 2022-06-12 07:19 346阅读 0赞

在配置nfs服务器，设定selinux时，碰到了SELinux: Could not downgrade policy file的错误提示，下文是其解决方案。

### 一、故障现象 ###

[root@system1 ~]# semanage fcontext -a -t 'public_content_t' '/protected(/.*)?'
    SELinux: Could not downgrade policy file /etc/selinux/targeted/policy/policy.29, searching for an older version.
    SELinux: Could not open policy file <= /etc/selinux/targeted/policy/policy.29: No such file or directory
    /sbin/load_policy: Can't load policy: No such file or directory
    libsemanage.semanage_reload_policy: load_policy returned error code 2.
    SELinux: Could not downgrade policy file /etc/selinux/targeted/policy/policy.29, searching for an older version.
    SELinux: Could not open policy file <= /etc/selinux/targeted/policy/policy.29: No such file or directory
    /sbin/load_policy: Can't load policy: No such file or directory
    libsemanage.semanage_reload_policy: load_policy returned error code 2.
    ValueError: Could not commit semanage transaction

### 二、解决方案 ###

从故障的提示来看，说不能够降级策略文件，以及找不到policy.29这个文件
    
    [root@system1 ~]# more /etc/redhat-release
    Red Hat Enterprise Linux Server release 7.0 (Maipo)
    [root@system1 ~]# uname -r
    3.10.0-123.el7.x86_64
    
    ###下面查看selinux配置，如下，为disabled状态
    
    [root@system1 ~]# sestatus
    SELinux status: disabled
    
    [root@system1 ~]# getenforce
    Disabled
    
    [root@system1 ~]# rpm -q libsepol libsemanage libselinux
    libsepol-2.1.9-3.el7.x86_64
    libsemanage-2.1.10-16.el7.x86_64
    libselinux-2.2.2-6.el7.x86_64
    
    ### 临时修改selinux 配置
    [root@system1 ~]# setenforce 1 ###尝试设置为1，依旧提示关闭
    setenforce: SELinux is disabled
    
    [root@system1 ~]# getenforce
    Disabled
    
    ### 查看enforce配置文件
    [root@system1 ~]# 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 - No SELinux policy is loaded.
    #SELINUX=permissive
    SELINUX=disabled
    # SELINUXTYPE= can take one of these two values:
    # targeted - Targeted processes are protected,
    # minimum - Modification of targeted policy. Only selected processes are protected.
    # mls - Multi Level Security protection.
    SELINUXTYPE=targeted
    
    ### 手工修改配置文件
    
    [root@system1 ~]# vi /etc/sysconfig/selinux
    
    SELINUX=enforce
    
    [root@system1 ~]# getenforce ###依旧为关闭
    Disabled
    
    ###不知道什么原因导致配置修改无法生效，于是尝试重启Linux
    
    [root@system1 ~]# reboot
    
    ### 再次修改和执行都OK
    [root@system1 ~]# getenforce
    Permissive
    [root@system1 ~]#
    [root@system1 ~]#
    [root@system1 ~]# setenforce 1
    [root@system1 ~]#
    [root@system1 ~]# getenforce
    Enforcing
    
    ### 再次执行semanage成功
    [root@system1 ~]# semanage fcontext -a -t 'public_content_t' '/protected(/.*)?'
    [root@system1 ~]#

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