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Re: [libvirt] [PATCH 0/12] Improve security driver handling & QEMU DAC management



On Wed, Jan 20, 2010 at 03:14:57PM +0000, Daniel P. Berrange wrote:
> This patch series does some work on te security drivers, and the QEMU code
> for managing DAC permissions on files. 
> 
> The core goal is to turn the QEMU driver DAC file management code into a
> security driver. Instead of QEMU calling into the SELinux/AppArmour drivers
> directly, a stacked driver module is introduced. This delegates all operations
> to first the QEMU DAC driver, and then the main SELinux/AppArmour driver. 
> The end result is that all the permissions management code is removed from 
> the QEMU driver, and we're left with just simple security driver calls.
> 
> In the process of this a number of flaws in the current hotplug  code were
> found, and code was generally tidied up with a view to making it easier to
> manage.
> 
> Finally, we add the ability to turn off the QEMU  DAC file managment code,
> and also deal gracefully with failures to change ownership (eg on NFS with
> root squash, or readonly FS).

hmmm, there's another problem which this patch set does not address:
error : virStorageFileGetMetadata:415 : cannot open file '/deep/into/my/root/squashing/export': Permission denied

With dynamic_ownership = 0, libvirt down not mess with chown, but it now
assumes that it can read disk images.

Regrards,

Dan.


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