A security fix briefly breaks DMA

Posted Apr 2, 2022 16:46 UTC (Sat) by khim (subscriber, #9252)
In reply to: A security fix briefly breaks DMA by mario-campos
Parent article: A security fix briefly breaks DMA

Because it wouldn't solve anything: DMA mechanism itself has no way to check how many bytes were actually written, only the driver can know that.

And using value passed along from the driver to make information unavailable to said driver… what would that achieve? The driver already can ignore the part that it doesn't need.