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Re: [libvirt] [PATCH] qemu: Add a qemu.conf option for clearing capabilities



On 05/27/2010 05:24 PM, Cole Robinson wrote:
> Currently there is no way to opt out of libvirt dropping POSIX
> capabilities for qemu. This at least is a useful debugging tool, but
> is also wanted by users (and distributors):
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=559154
> https://bugzilla.redhat.com/show_bug.cgi?id=573850
> 
> Signed-off-by: Cole Robinson <crobinso redhat com>
> ---
>  src/qemu/qemu.conf     |    5 +++++
>  src/qemu/qemu_conf.c   |    5 +++++
>  src/qemu/qemu_conf.h   |    2 +-
>  src/qemu/qemu_driver.c |   11 +++++++++--
>  4 files changed, 20 insertions(+), 3 deletions(-)
> 
> diff --git a/src/qemu/qemu.conf b/src/qemu/qemu.conf
> index 98a1176..b976dcc 100644
> --- a/src/qemu/qemu.conf
> +++ b/src/qemu/qemu.conf
> @@ -178,3 +178,8 @@
>  # QEMU_AUDIO_DRV environment variable when using VNC.
>  #
>  # vnc_allow_host_audio = 0
> +#
> +
> +# If clear_emulator_capabilities is enabled, libvirt will drop all POSIX
> +# capabilities of the QEmu/KVM emulator. This is enabled by default
> +# clear_emulator_capabilities = 1

s/POSIX/privileged/ - POSIX doesn't say anything about superuser
privileges, so we aren't dropping POSIX capabilities.

Leaving qemu privileged means that a compromised guest can exploit the
privileges and do damage to the hypervisor; is it worth adding
additional comments warning the user about the lack of security inherent
in clearing the option?

ACK with that wording tweak.

-- 
Eric Blake   eblake redhat com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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