解决cannot enable executable stack as shared object requires: Permission denied问题

启动错误问题排查

一、启动apache服务错误提示。

Starting httpd: httpd: Syntax error on line 211 of /etc/httpd/conf/httpd.conf: Syntax error on line 6 of /etc/httpd/conf.d/php.conf: Cannot 
load /etc/httpd/modules/libphp5.so into server: libcrypto.so.6: cannot enable executable stack as shared object requires: Permission denied


Starting httpd: httpd: Syntax error on line 211 of /etc/httpd/conf/httpd.conf: Syntax error on line 6 of /etc/httpd/conf.d/php.conf: Cannot 
load /etc/httpd/modules/libphp5.so into server: libcrypto.so.6: cannot enable executable stack as shared object requires: Permission denied

经过以上错误判断应为selinux问题。

二、尝试关闭selinux，启动apache。

/usr/sbin/setenforce 0
/etc/init.d/httpd start
Starting httpd: [Wed Apr 24 12:37:39 2019]     [  OK  ]

启动成功了。肯定是selinux问题。为系统安全，不想关闭selinux改如何解决呢？

解决selinux问题：

一、查看audit.log日志。

/usr/sbin/setenforce 1
less /var/logs/audit/audit.log

type=AVC msg=audit(1556086804.050:571845): avc:  denied  { execstack } for  pid=17397 comm="httpd" scontext=root:system_r:httpd_t:s0 tcontex
t=root:system_r:httpd_t:s0 tclass=processtype=SYSCALL msg=audit(1556086804.050:571845): arch=c000003e syscall=10 success=no exit=-13 a0=7fff31feb000 a1=1000 a2=1000007 a3=4 items=0 
ppid=17394 pid=17397 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts1 ses=187 comm="httpd" exe="/usr/sbin/httpd" subj=root:system_r:httpd_t:s0 key=(null)

二、执行execstack处理。

最简单的解决办法就是执行execstack:
execstack --clear-execstack /lib/libcrypto.so.6
execstack --clear-execstack /lib/libcrypto.so.6

execstack 部分参数以下：
-s --set-execstack
              Mark binary or shared library as requiring executable stack.
-c --clear-execstack
              Mark binary or shared library as not requiring executable stack.
-q --query
              Query executable stack marking of binaries and shared libraries.  For each file it prints either - when executable stack
              is  not  required,  X  when executable stack is required or ?  when it is unknown whether the object requires or doesn’t
              require executable stack (the marking is missing).

经过-q参数查看指定文件是否须要executable stack，若是输出的开头是"-"，表示executable stack is  not  required，若是是“X”，表示executable stack is required，若是是“？”，表示未知。
:/root> execstack -q /lib/libcrypto.so.6
? /lib/libcrypto.so.6
:/root> execstack -c /lib/libcrypto.so.6
:/root> execstack -q /lib/libcrypto.so.6
- /lib/libcrypto.so.6
:/root>

三、根据日志生成PP文件。

grep httpd /var/log/audit/audit.log | audit2allow -M httpdfixlocal

******************** IMPORTANT ***********************
To make this policy package active, execute:

semodule -i httpdfixlocal.pp

四、执行PP文件。

/usr/sbin/semodule -i httpdfixlocal.pp

五、启动httpd，可正常启动。

 

注意：setsebool，semodule等命令需安装以下工具包。

yum install policycoreutils