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A few thoughts ... First, tails scrubs memory (or something like that) when you shut down - should they be scrubbing vram as well ? Second, wouldn't it be qui
by rsync 12y ago
A few thoughts ...
First, tails scrubs memory (or something like that) when you shut down - should they be scrubbing vram as well ?
Second, wouldn't it be quick and simple to "scrub" vram by filling it up with intensive usage after working on sensitive information ? What happens if I watch 2 minutes of 1080p video - wouldn't we expect all previous framebuffer data to be flushed at that point ?
Finally, I would be very curious to see how this changes as you work with multiple graphics cards in a multi-monitor setup. I tend to have all of my VMs in windows confined to a particular monitor that is driven by its own graphics card - presumably those guest operating systems are only accessing that framebuffer ?
- datenwolf 12y ago> should they be scrubbing vram as well Yes, but VRAM is a tricky beast. Modern GPUs actually have MMUs and the VRAM address layout the CPU sees may not cover the whole of the memory of the graphics card. > What happens if I watch 2 minutes of 1080p video - wouldn't we expect all previous framebuffer data to be flushed at that point ? No, because the video frames will be queued in a circular buffer and anything outside of that doesn't get touched.
- cesarb 12y agoThe only way I can see to reliably scrub VRAM would be to use the GPU as a "dumb framebuffer" (without video acceleration), like in the good old days. Then to scrub what was used in the session it should be enough to draw a black screen, do a page flip, and draw a black screen again.
- brokencog 12y agothe original post shows Tails leaking info.