On 2016-12-27 04:05, bancfc(a)openmailbox.org wrote:
Background:
Canvas fingerprinting is a technique to track users based on their
GPUs.
https://en.wikipedia.org/wiki/Canvas_fingerprinting
Someone did some testing and the good news is the fingerprint is
common for all users of the same OS across all KVM users because it
presents the same virtual GPU/drivers for everybody.
What I need your help to find out is whether this holds for Virgil3D
users that enable graphics acceleration. (I am running on Debian and
the libvirt version in the repos is too old to have this included also
I don't have multiple machines)
To test this you need:
To run plain FireFox on a virtualized distro (with GL acceleration
enabled in libvirt) of your choice and visit
https://browserleaks.com/canvas . Then repeat the same steps with that
same distro (in a VM) on another physical machine and compare values.
A good result is if you see the same numbers for both machines. That
means the virtual device fingerprint is uniform for all virtual
users.
Bumping. I realized I post this in holiday season when it was easily
missed.
Since CANVAS is about graphics drivers version the question can be
simplified: Is the virtio-gpu driver version uniform across KVM
versions?