壳执行 |允许特定程序在 apache 用户下运行

Question

我可以使用 php.ini 中的 shell_exec 运行特定的命令/程序，例如需要 root 权限的 x 服务器吗？我只想从 php shell_exec() 运行 x 服务器程序。 注意：php在suphp下运行，操作系统是centos。

Answer 1

查看 Unix 文件上的 SUID 和 SGID

SUID stands for Set User ID. This means that if the SUID bit is set for any application then your user ID would be set as that of the owner of application/file rather than the current user, while running that application. That means in case I have an application whose owner is ' root ' and it has its SUID bit set, then when I run this application as a normal user, that application would still run as root. Since the SUID bit tells Linux that the the User ID root is set for this application and whenever this application executes it must execute as if root was executing it (since root owns this file).