linux-kernel - Re: [patch 2/8] allow unprivileged umount

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Message-Id: <E1HfW90-00045g-00@dorka.pomaz.szeredi.hu>
Date:	Sun, 22 Apr 2007 09:05:58 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	ebiederm@...ssion.com
CC:	miklos@...redi.hu, akpm@...ux-foundation.org, serue@...ibm.com,
	viro@....linux.org.uk, linuxram@...ibm.com,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	containers@...ts.osdl.org
Subject: Re: [patch 2/8] allow unprivileged umount

>   I suspect we can allow MNT_FORCE for non-privileged users 
>   as well if we can trust the filesystem.

I don't think so.  MNT_FORCE has side effects on the superblock.  So a
user shouldn't be able to force an unmount on a bind mount s/he did,
but there's no problem with allowing plain/lazy unmounts.

We could possibly allow MNT_FORCE, for FS_SAFE filesystems.

Miklos
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