On 02/16/15 12:07, cprise wrote:
>> On 02/16/15 04:38, Joanna Rutkowska wrote:
>>>> Xen has support for emulating CPUID for HVM guests -- take a look at the
>> config examples in:
>>>> xen-4.1.6.1/tools/examples/xmexample.hvm-stubdom
>>>> I haven't played with it, but see no reasons it should not work. I can
>> imagine we introduce a prefs for VMs (say "generic_cpuid" settable via
>> qvm-prefs) that would be resulting in additional config for cpuid
>> emulation inserted in the config file for such VMs. We would need to
>> agree on good-enough-for-everybody CPUID config and stick to it then.
>> Again, this would be use-able for anon VMs mostly.
>>>> However, this will not work for PV VMs, because the CPUID instruction is
>> not a privileged instruction, so malware in a PV VM can always execute
>> this instruction (even if we hooked Xen interface for CPUID-like info to
>> the guest) without trapping into XEN in PV operation.
>>>> AFAIU, there are not personal identifying info returned by CPUID, but I
>> can see how this could be used as an additional fingerprinting vector.
>> Thus, perhaps we should consider distributing Whonix workstation
>> template as an HVM template instead of a PVM one? Fortunately we do have
>> templates support for HVMs, so this should be perfectly possible.
>>>> Let me also point out the already discussed-multiple-times topic of
>> potential covert channels between cooperative VMs, which might also be
>> potentially exploited in some scenarios to fingerprint user environment.
>> That is more difficult to address on PC architecture though, but some
>> work on Xen-level is nevertheless very welcome (see #817).
>>>> Thanks,
>> joanna.
>>>> Getting back to parent thread's topic: The discovery of LAN IP address does not
> even require any intrusion/exploit into the system... it's really just a feature.
>> But being on a '10.137' net is probably more identifying than having, say, an
> i5-3320M stepping 7 processor.
>> So perhaps Qubes should have a configurable LAN address (like a regular router
> does) so that concerned users/admins can change it to something that is common
> but also works within their LAN environments.
>>
Patches welcome :)
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