[root@camp-3-4-app ~]# cat /etc/redhat-release 
CentOS Linux release 8.4.2105

　　execstack is provided by the package prelink：

　　就是execstack这个命令在prelink软件包里。

[root@camp-3-4-app ~]# rpm -qlp http://mirror.centos.org/centos-7/7/os/x86_64/Packages/prelink-0.5.0-9.el7.x86_64.rpm | grep exec
warning: http://mirror.centos.org/centos-7/7/os/x86_64/Packages/prelink-0.5.0-9.el7.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEY
/usr/bin/execstack
/usr/share/man/man8/execstack.8.gz
[root@camp-3-4-app ~]# rpm -ivh http://mirror.centos.org/centos-7/7/os/x86_64/Packages/prelink-0.5.0-9.el7.x86_64.rpm 
Retrieving http://mirror.centos.org/centos-7/7/os/x86_64/Packages/prelink-0.5.0-9.el7.x86_64.rpm
warning: /var/tmp/rpm-tmp.PrD0wR: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEY
Verifying...                          ################################# [100%]
Preparing...                          ################################# [100%]
Updating / installing...
   1:prelink-0.5.0-9.el7              ################################# [100%]

　　查看版本，说明安装成功

[root@camp-3-4-app ~]# execstack -V
execstack 1.0

　　解决这个问题的文档来自于：https://stackoverflow.com/questions/43026871/where-is-the-execstack-in-centos-7