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Re: [Qemu-devel] [PATCH 4/4][RFC] Add logic to QEMU to read command line
From: |
Brian Wheeler |
Subject: |
Re: [Qemu-devel] [PATCH 4/4][RFC] Add logic to QEMU to read command line options from qcow2 images |
Date: |
Thu, 09 Aug 2007 16:55:23 -0400 |
On Thu, 2007-08-09 at 23:16 +0300, Avi Kivity wrote:
> Anthony Liguori wrote:
> >>
> >> I think it is a bad idea from a security POV to automatically extract
> >> & use command line args from a disk image like this without the
> >> admin explicitly requesting this capability.
> >> eg If I grabbed a demo disk image from a vendors' or community
> >> website I would
> >> certainly not trust whatever args may happen to be embedded in the
> >> disk image
> >> and thus do not want QEMU to be automatically running using them.
> >>
> >> I'd recommend having some command line flag to turn this capability
> >> on. For
> >> example a '--args PATH-TO-DISK' flag,
> >>
> >> qemu --args $HOME/fedora.qcow
> >>
> >
> > That's pretty nasty. How do you specify which disk this is then? I
> > do agree with you that allowing arbitrary command line arguments in an
> > image file is probably a bad idea. I think the general idea of being
> > able to launch a single image is useful but I suspect this is not the
> > right way to do it.
> >
> > What are some people thinking would want to be stored in the file?
> > Most of the command line options are more host specific than guest
> > specific I think. Maybe we can store a pseudo-config instead that
> > only contains a subset of parameters (and therefore, wouldn't pose a
> > security risk)?
>
> Memory size, -hdb and -cdrom, processor count, networking setup. The
> sort of things people push into ad-hoc scripts.
>
> I expect this to be the low-end solution; with high end management
> applications storing configuration options in a database.
>
>
Why not just save the options to a file and have qemu parse it? That
way all of the security issues are taken care of, and it can be cross
platform (no need for a shell script and/or batch file) so it'd be
portable.
If the format was one flag per line (as if the command line got broken
up in pairs) as in "-hdb myfile.img" being on one line and "-fda
boot.img" on another line, then its easy to edit programically as well.
All of my shell scripts to start qemu tend to look like this:
qemu -hda disk0.img -net nic -net user -m 512 -localtime $*
so I can pass one-time parameters as necessary (that's the $* at the
end) by specifying args when I invoke the script. If qemu had a default
configuration file it looked for, and then you could specify one-or-more
configuration files to read in addition (later values overriding earlier
ones), then it seems like it'd work out for most if not all situations.
Brian
- Re: [Qemu-devel] [PATCH 4/4][RFC] Add logic to QEMU to read command line options from qcow2 images, (continued)
- Re: [Qemu-devel] [PATCH 4/4][RFC] Add logic to QEMU to read command line options from qcow2 images, Daniel P. Berrange, 2007/08/09
- Re: [Qemu-devel] [PATCH 4/4][RFC] Add logic to QEMU to read command line options from qcow2 images, Avi Kivity, 2007/08/09
- Re: [Qemu-devel] [PATCH 4/4][RFC] Add logic to QEMU to read command line options from qcow2 images, Anthony Liguori, 2007/08/09
- Re: [Qemu-devel] [PATCH 4/4][RFC] Add logic to QEMU to read command line options from qcow2 images, Avi Kivity, 2007/08/09
- Re: [Qemu-devel] [PATCH 4/4][RFC] Add logic to QEMU to read command line options from qcow2 images, Anthony Liguori, 2007/08/09
- Re: [Qemu-devel] [PATCH 4/4][RFC] Add logic to QEMU to read command line options from qcow2 images, Avi Kivity, 2007/08/09
- Re: [Qemu-devel] [PATCH 4/4][RFC] Add logic to QEMU to read command line options from qcow2 images, Brian Wheeler, 2007/08/09
- Re: [Qemu-devel] [PATCH 4/4][RFC] Add logic to QEMU to read command line options from qcow2 images, Anthony Liguori, 2007/08/09
- Re: [Qemu-devel] [PATCH 4/4][RFC] Add logic to QEMU to read command line options from qcow2 images, dmc, 2007/08/09
- Re: [Qemu-devel] [PATCH 4/4][RFC] Add logic to QEMU to read command line options from qcow2 images, Carlos A. M. dos Santos, 2007/08/10
- Re: [Qemu-devel] [PATCH 4/4][RFC] Add logic to QEMU to read command line options from qcow2 images,
Brian Wheeler <=
- Re: [Qemu-devel] [PATCH 4/4][RFC] Add logic to QEMU to read command line options from qcow2 images, Anthony Liguori, 2007/08/09
Re: [Qemu-devel] [PATCH 4/4][RFC] Add logic to QEMU to read command line options from qcow2 images, andrzej zaborowski, 2007/08/11
- Re: [Qemu-devel] [PATCH 4/4][RFC] Add logic to QEMU to read command line options from qcow2 images, Philip Boulain, 2007/08/11
- Re: [Qemu-devel] [PATCH 4/4][RFC] Add logic to QEMU to read command line options from qcow2 images, Anthony Liguori, 2007/08/11
- Re: [Qemu-devel] [PATCH 4/4][RFC] Add logic to QEMU to read command line options from qcow2 images, Philip Boulain, 2007/08/11
- Re: [Qemu-devel] [PATCH 4/4][RFC] Add logic to QEMU to read command line options from qcow2 images, Anthony Liguori, 2007/08/11
- Re: [Qemu-devel] [PATCH 4/4][RFC] Add logic to QEMU to read command line options from qcow2 images, Jorge Lucángeli Obes, 2007/08/13
- Re: [kvm-devel] [Qemu-devel] [PATCH 4/4][RFC] Add logic to QEMU to read command line options from qcow2 images, Anthony Liguori, 2007/08/13