From: Jan Kara <jack@suse.cz>
To: Josef Sipek <jsipek@fsl.cs.sunysb.edu>
Cc: Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
hch@infradead.org, viro@ftp.linux.org.uk, torvalds@osdl.org,
mhalcrow@us.ibm.com, David Quigley <dquigley@fsl.cs.sunysb.edu>,
Erez Zadok <ezk@cs.sunysb.edu>
Subject: Re: [PATCH 01/24] Unionfs: Documentation
Date: Tue, 9 Jan 2007 13:15:52 +0100 [thread overview]
Message-ID: <20070109121552.GA1260@atrey.karlin.mff.cuni.cz> (raw)
In-Reply-To: <20070108231524.GA1269@filer.fsl.cs.sunysb.edu>
> On Mon, Jan 08, 2007 at 11:18:52AM -0800, Andrew Morton wrote:
> > On Sun, 7 Jan 2007 23:12:53 -0500
> > "Josef 'Jeff' Sipek" <jsipek@cs.sunysb.edu> wrote:
> >
<snip>
> > > Any such change can cause Unionfs to oops, or stay
> > > silent and even RESULT IN DATA LOSS.
> >
> > With a rather rough user interface ;)
>
> That statement is meant to scare people away from modifying the lower fs :)
> I tortured unionfs quite a bit, and it can oops but it takes some effort.
But isn't it then potential DOS? If you happen to union two filesystems
and an untrusted user has write access to both original filesystem and
the union, then you say he'd be able to produce oops? That does not
sound very secure to me... And if any secure use of unionfs requires
limitting access to the original trees, then I think it's a good reason
to implement it in unionfs itself. Just my 2 cents.
Honza
--
Jan Kara <jack@suse.cz>
SuSE CR Labs
next prev parent reply other threads:[~2007-01-09 12:15 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-08 4:12 [PATCH 00/24] Unionfs, try #4 Josef 'Jeff' Sipek
2007-01-08 4:12 ` [PATCH 01/24] Unionfs: Documentation Josef 'Jeff' Sipek
2007-01-08 19:18 ` Andrew Morton
2007-01-08 19:43 ` Shaya Potter
2007-01-08 20:24 ` Jan Engelhardt
2007-01-08 21:32 ` Shaya Potter
2007-01-08 21:19 ` Andrew Morton
2007-01-08 21:30 ` Shaya Potter
2007-01-08 22:02 ` Andrew Morton
2007-01-08 22:21 ` Shaya Potter
2007-01-08 23:34 ` Jan Engelhardt
2007-01-08 23:37 ` Josef Sipek
2007-01-09 0:03 ` Erez Zadok
2007-01-09 9:53 ` Christoph Hellwig
2007-01-09 10:43 ` Josef Sipek
2007-01-09 10:47 ` Christoph Hellwig
2007-01-09 10:48 ` Christoph Hellwig
2007-01-09 17:28 ` Erez Zadok
2007-01-08 23:25 ` Josef Sipek
2007-01-09 9:49 ` Christoph Hellwig
2007-01-09 10:36 ` Josef Sipek
2007-01-08 20:51 ` Erez Zadok
2007-01-08 21:53 ` Jan Engelhardt
2007-01-08 23:00 ` Michael Halcrow
2007-01-08 23:45 ` Josef Sipek
2007-01-09 0:19 ` Giuseppe Bilotta
2007-01-09 0:33 ` Josef Sipek
2007-01-09 1:26 ` Jan Engelhardt
2007-01-09 1:50 ` Shaya Potter
2007-01-09 12:26 ` Jan Kara
2007-01-09 16:39 ` Trond Myklebust
2007-01-09 17:04 ` Jan Kara
2007-01-09 17:07 ` Trond Myklebust
2007-01-09 17:34 ` Erez Zadok
2007-01-10 16:12 ` Jan Kara
2007-01-10 20:15 ` Erez Zadok
2007-01-10 20:24 ` Shaya Potter
2007-01-10 21:27 ` Jan Kara
2007-01-10 23:20 ` Josef Sipek
2007-01-10 23:29 ` Shaya Potter
2007-01-11 8:54 ` Jan Kara
2007-01-08 23:15 ` Josef Sipek
2007-01-09 12:15 ` Jan Kara [this message]
2007-01-09 16:30 ` Trond Myklebust
2007-01-09 16:41 ` Shaya Potter
2007-01-09 17:03 ` Trond Myklebust
2007-01-09 17:11 ` Shaya Potter
2007-01-09 17:16 ` Erez Zadok
2007-01-09 17:16 ` Jan Kara
2007-01-09 22:02 ` Jan Engelhardt
2007-01-11 14:29 ` unionfs unusable on multiuser systems (was Re: [PATCH 01/24] Unionfs: Documentation) Pavel Machek
2007-01-12 14:17 ` Shaya Potter
2007-01-08 4:12 ` [PATCH 02/24] lookup_one_len_nd - lookup_one_len with nameidata argument Josef 'Jeff' Sipek
2007-01-08 4:12 ` [PATCH 03/24] Unionfs: Branch management functionality Josef 'Jeff' Sipek
2007-01-08 4:12 ` [PATCH 04/24] Unionfs: Common file operations Josef 'Jeff' Sipek
2007-01-08 21:28 ` Andrew Morton
2007-01-08 4:12 ` [PATCH 05/24] Unionfs: Copyup Functionality Josef 'Jeff' Sipek
2007-01-08 21:29 ` Andrew Morton
2007-01-08 22:00 ` Shaya Potter
2007-01-08 4:12 ` [PATCH 06/24] Unionfs: Dentry operations Josef 'Jeff' Sipek
2007-01-08 21:29 ` Andrew Morton
2007-01-08 4:12 ` [PATCH 07/24] Unionfs: File operations Josef 'Jeff' Sipek
2007-01-08 4:13 ` [PATCH 08/24] Unionfs: Directory file operations Josef 'Jeff' Sipek
2007-01-08 4:13 ` [PATCH 09/24] Unionfs: Directory manipulation helper functions Josef 'Jeff' Sipek
2007-01-08 4:13 ` [PATCH 10/24] Unionfs: Inode operations Josef 'Jeff' Sipek
2007-01-08 4:13 ` [PATCH 11/24] Unionfs: Lookup helper functions Josef 'Jeff' Sipek
2007-01-08 4:13 ` [PATCH 12/24] Unionfs: Main module functions Josef 'Jeff' Sipek
2007-01-08 4:13 ` [PATCH 13/24] Unionfs: Readdir state Josef 'Jeff' Sipek
2007-01-08 4:13 ` [PATCH 14/24] Unionfs: Rename Josef 'Jeff' Sipek
2007-01-08 4:13 ` [PATCH 15/24] Unionfs: Privileged operations workqueue Josef 'Jeff' Sipek
2007-01-08 21:27 ` Andrew Morton
2007-01-08 4:13 ` [PATCH 16/24] Unionfs: Handling of stale inodes Josef 'Jeff' Sipek
2007-01-08 4:13 ` [PATCH 17/24] Unionfs: Miscellaneous helper functions Josef 'Jeff' Sipek
2007-01-08 4:13 ` [PATCH 18/24] Unionfs: Superblock operations Josef 'Jeff' Sipek
2007-01-08 21:29 ` Andrew Morton
2007-01-08 4:13 ` [PATCH 19/24] Unionfs: Helper macros/inlines Josef 'Jeff' Sipek
2007-01-08 21:28 ` Andrew Morton
2007-01-08 4:13 ` [PATCH 20/24] Unionfs: Internal include file Josef 'Jeff' Sipek
2007-01-08 4:13 ` [PATCH 21/24] Unionfs: Include file Josef 'Jeff' Sipek
2007-01-08 4:13 ` [PATCH 22/24] Unionfs: Unlink Josef 'Jeff' Sipek
2007-01-08 4:13 ` [PATCH 23/24] Unionfs: Kconfig and Makefile Josef 'Jeff' Sipek
2007-01-08 4:13 ` [PATCH 24/24] Unionfs: Extended Attributes support Josef 'Jeff' Sipek
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