linux-kernel - Re: [RFC PATCH 2/3] add statmnt(2) syscall

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Message-ID: <20230919-hackordnung-asketisch-331907800aa0@brauner>
Date:   Tue, 19 Sep 2023 14:41:25 +0200
From:   Christian Brauner <brauner@...nel.org>
To:     Miklos Szeredi <miklos@...redi.hu>
Cc:     Matthew House <mattlloydhouse@...il.com>,
        Miklos Szeredi <mszeredi@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-api@...r.kernel.org, linux-man@...r.kernel.org,
        linux-security-module@...r.kernel.org, Karel Zak <kzak@...hat.com>,
        Ian Kent <raven@...maw.net>,
        David Howells <dhowells@...hat.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <christian@...uner.io>,
        Amir Goldstein <amir73il@...il.com>
Subject: Re: [RFC PATCH 2/3] add statmnt(2) syscall

> >  with __u32 size for mnt_root and mnt_point
> 
> Unnecessary if the strings are nul terminated.

All ok by me so far but how does the kernel know the size of the buffer
to copy into? Wouldn't it be better to allow userspace to specify that?
I'm probably just missing something but I better ask.