linux-kernel - Re: [PATCH 1/2] implement uid mount option for ext2

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Date:	Sat, 25 Jul 2009 00:16:58 +0100
From:	Jamie Lokier <jamie@...reable.org>
To:	John Stoffel <john@...ffel.org>
Cc:	Andreas Dilger <adilger@....com>,
	Ludwig Nussel <ludwig.nussel@...e.de>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] implement uid mount option for ext2

John Stoffel wrote:
> I didn't read the original email closely, but I have to say that both
> of these plans don't sound good to me.  If you can mount a filesystem,
> you're root already, so you can do any fixup you need.

What if someone lends you a 1TB disk, for you to browse it in your
favourite GUI or Shell Window to read some files from it?  And you're
to put a couple of files on it before you give it back?

Hotplug scripts run as root to mount it, and you have your GUI / Shell
Window which don't run as root to read and write a few of those files.

You must not chown anything on the disk, because it isn't your disk.

> But in that case, you're screwed anyway and it's going to become
> un-manageable.  Push this to userspace, not the kernel since it's a
> userspace issue when you come right down to it.

How do you handle the above scenario in userspace?

-- Jamie
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