进程的real , effective , saved user ID
2012-05-10 10:18
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real User ID:实际运行此进程的用户的 uid。例如:test 用户执行ls命令,那么ls进程的real User ID就是test用户的 uid
effective user ID:是可执行文件的 owner id,例如:/bin/ls 的owner id 是root,那么执行ls的effective user ID就是 root的 uid
saved user ID:因为进程的effective user id最初是继承自父进程的effective user id,当执行exec的时候,有可能发生变化,所以需要保存之前的effective user id
effective user ID:是可执行文件的 owner id,例如:/bin/ls 的owner id 是root,那么执行ls的effective user ID就是 root的 uid
saved user ID:因为进程的effective user id最初是继承自父进程的effective user id,当执行exec的时候,有可能发生变化,所以需要保存之前的effective user id
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