To translate last tweet into English, ARM processors do have microcode in display system you can use to hide a backdoor not in memory
-
-
@AndreaBarisani the question comes down to: does the VPU ask those reads to be privileged or unprivileged for that stream in the MMU -
@AndreaBarisani ok, more precise wording are display read accesses through mmu-400 configured with nonsecure state -
@AndreaBarisani I'd like the dojo material so I can take the piss on@dragosr & TZ DMA, thanks ;) -
@cynicalsecurity@AndreaBarisani Arrigo you need to go to http://infocenter.arm.com :-P Trying to identify display read access security state. -
@dragosr@cynicalsecurity no, u need to understand that VPU is a peripheral and http://arm.com info and/or MMU play no role here ;) -
@AndreaBarisani@cynicalsecurity well if you are certain there are no unexpected ways you can use the display processing tables and DMA... -
@dragosr@cynicalsecurity we spent months hammering this thing while making the USB armory and the dojo, it is really not that simple -
@AndreaBarisani@cynicalsecurity never called this simple. Saw not very well documented microcode with DMA and got curious. Still am. - 5 more replies
New conversation -
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.