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From: "Daniel P. Berrange" <berrange@redhat.com>
To: Ian Jackson <Ian.Jackson@eu.citrix.com>
Cc: xen-devel@lists.xensource.com
Subject: Re: [PATCH] disable lomount and miniterm by default
Date: Wed, 16 Jan 2008 17:11:31 +0000	[thread overview]
Message-ID: <20080116171131.GC27604@redhat.com> (raw)
In-Reply-To: <18318.14444.387687.996933@mariner.uk.xensource.com>

On Wed, Jan 16, 2008 at 05:01:32PM +0000, Ian Jackson wrote:
Content-Description: message body text
> lomount is a tool which reads and parses a partition table in a disk
> image block device and then uses mount -o ...offset=... to mount it.
> This is not an ideal approach.  For example, if the intended
> filesystem has corrupted metadata the kernel's filesystem driver may
> start to write outside of the intended region.  This might even be
> exploitable in some perverse circumstances.
> 
> Nowadays people wanting to do this should use kpartx, which uses
> devmapper to create appropriate range mappings.  So lomount should be
> disabled.

+1 for this.

> miniterm may well be useful but it is a clone-and-hack of an upstream
> project and is currently built but not installed by default, partly
> because it doesn't make sense to install on the dom0 which it might be
> trying to debug.

Any idea of what the changes are wrt to upstream ?  If they're useful
we should try and get them upstream.

While on the subject of tools, I'm puzelled why Xen has created custom tools 
qcow-create, qcow2raw and img2qcow,  when they are less functional than
the existing 'qemu-img' tool that comes as part of the QEMU codebase

Dan.
-- 
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|=-           Perl modules: http://search.cpan.org/~danberr/              -=|
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  reply	other threads:[~2008-01-16 17:11 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-16 17:01 [PATCH] disable lomount and miniterm by default Ian Jackson
2008-01-16 17:11 ` Daniel P. Berrange [this message]
2008-01-17 16:12   ` Ian Jackson

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