Reading Comperhension - HURD implement - file access control

[shaharhada]

The Hurd is a collection of servers that run on the Mach microkernel to implement file systems, network protocols, file access control, and other features that are implemented by the Unix kernel or similar kernels (such as Linux).
What does it means to implement file access control in this context?
From the source:
The GNU Hurd - GNU Project - Free Software Foundation (FSF) (utl.pt)
Thank for helpers.

 

[kanewolf]

The Hurd is a collection of servers that run on the Mach microkernel to implement file systems, network protocols, file access control, and other features that are implemented by the Unix kernel or similar kernels (such as Linux).
What does it means to implement file access control in this context?
From the source:
The GNU Hurd - GNU Project - Free Software Foundation (FSF) (utl.pt)
Thank for helpers.

It means that a file has attributes, that can be set to allow specific users (or processes owned by users) access to the file.
In Linux a file has three sets of attributes, world access, group access and owner access. A typical setting for a text file might be "644" -- The owner has read/write. The group the file has assigned has read only and world has read only access. The file is not an executable to anyone.
See this article for background -- https://www.linux.com/training-tutorials/understanding-linux-file-permissions/