linux-ext4 - Re: [PATCH 1/3] implement uid and gid mount options for ext2

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Message-ID: <20120802130642.46b12c59@pyramind.ukuu.org.uk>
Date:	Thu, 2 Aug 2012 13:06:42 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Ludwig Nussel <ludwig.nussel@...e.de>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Jan Kara <jack@...e.cz> (maintainer:EXT2 FILE SYSTEM),
	Rob Landley <rob@...dley.net> (maintainer:DOCUMENTATION),
	Andrew Morton <akpm@...ux-foundation.org> (maintainer:EXT3 FILE
	SYSTEM),
	Andreas Dilger <adilger.kernel@...ger.ca> (maintainer:EXT3 FILE
	SYSTEM),
	"Theodore Ts'o" <tytso@....edu> (maintainer:EXT4 FILE SYSTEM),
	linux-ext4@...r.kernel.org (open list:EXT2 FILE SYSTEM),
	linux-doc@...r.kernel.org (open list:DOCUMENTATION)
Subject: Re: [PATCH 1/3] implement uid and gid mount options for ext2

> +uid=n[:m]			Make all files appear to belong to uid n.
> +				Useful for e.g. removable media with fstab
> +				options 'user,uid=useruid'. The optional second
> +				uid m is actually written to the file system.

So what happens if I insert a USB key containing a device node to the
hard disk ? Why is this functionality useful in the current form ?

(ie I think you need an actual rational security model first)


Also why is this at the per fs level duplicating stuff each time rather
than at the vfs level - this seems to be vfs level functionality.

> +
> +gid=n[:m]			Make all files appear to belong to gid n.
> +				The optional second gid m is actually written to
> +				the file system.

Your documentation seems only half completed ?

Alan
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