linux-kernel - Re: [PATCH v2 3/3] ovl: fix the parsing of empty string mount parameters

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Message-ID: <CAJfpegtQSi0GFzUEDqdeOAq7BN2KvDV8i3oBFvPOCKfJJOBd2g@mail.gmail.com>
Date: Mon, 11 Mar 2024 10:25:20 +0100
From: Miklos Szeredi <miklos@...redi.hu>
To: Luis Henriques <lhenriques@...e.de>
Cc: "Theodore Ts'o" <tytso@....edu>, Andreas Dilger <adilger.kernel@...ger.ca>, 
	Alexander Viro <viro@...iv.linux.org.uk>, Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>, 
	Amir Goldstein <amir73il@...il.com>, linux-ext4@...r.kernel.org, 
	linux-fsdevel@...r.kernel.org, linux-unionfs@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] ovl: fix the parsing of empty string mount parameters

On Thu, 7 Mar 2024 at 19:17, Luis Henriques <lhenriques@...e.de> wrote:
>
> This patch fixes the usage of mount parameters that are defined as strings
> but which can be empty.  Currently, only 'lowerdir' parameter is in this
> situation for overlayfs.  But since userspace can pass it in as 'flag'
> type (when it doesn't have a value), the parsing will fail because a
> 'string' type is assumed.

I don't really get why allowing a flag value instead of an empty
string value is fixing anything.

It just makes the API more liberal, but for what gain?

Thanks,
Miklos