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

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Message-ID: <20230918-bestialisch-brutkasten-1fb34abdc33c@brauner>
Date:   Mon, 18 Sep 2023 17:22:20 +0200
From:   Christian Brauner <brauner@...nel.org>
To:     Miklos Szeredi <miklos@...redi.hu>
Cc:     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

> So to be clear about your proposal: .mnt_root and .mountpoint are
> initialized by the caller to buffers that the kernel can copy paths
> into?

Yeah, u64 pointer to a buffer and a size (see e.g., @set_tid and
@set_tid_size for struct clone_args, @log_buf and @log_size and other
args in there).

> 
> If there's an overflow (one of the buffers was too small) the syscall
> returns -EOVERFLOW?

Yeah, I mean we have to make some things their problem.

To me that is an acceptable compromise.