NetBSD Problem Report #58082

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Date: Tue, 26 Mar 2024 21:18:43 +0000 (UTC)
From: campbell+netbsd@mumble.net
Reply-To: campbell+netbsd@mumble.net
To: gnats-bugs@NetBSD.org
Subject: mount_null(8) is missing important semantics
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>Number:         58082
>Category:       kern
>Synopsis:       mount_null(8) is missing important semantics
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          doc-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Mar 26 21:20:00 +0000 2024
>Last-Modified:  Thu Mar 28 02:55:52 +0000 2024
>Originator:     Taylor R Campbell
>Release:        current, 10, 9, 8, ...
>Organization:
The NullBSD Foundationsystem
>Environment:
>Description:
mount_null(8) exposes the directory tree of a mount point, but doesn't
actually hide anything in the file system from file handles, so it
cannot be used to make a subtree-restricted NFS export of a file
system.

The bulk of the mount_null(8) file system is about the implementation
details of layerfs, not about the semantics.  This should be moved to
a design document in /usr/share/doc or something and the man page
should focus on semantics.
>How-To-Repeat:
man mount_null
>Fix:
Yes, please!

>Release-Note:

>Audit-Trail:
>Unformatted:

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