To translate last tweet into English, ARM processors do have microcode in display system you can use to hide a backdoor not in memory
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Replying to @AndreaBarisani
@AndreaBarisani the question comes down to: does the VPU ask those reads to be privileged or unprivileged for that stream in the MMU3 replies 0 retweets 1 like -
Replying to @dragosr
@AndreaBarisani ok, more precise wording are display read accesses through mmu-400 configured with nonsecure state4 replies 0 retweets 1 like -
Replying to @dragosr
@AndreaBarisani I'd like the dojo material so I can take the piss on@dragosr & TZ DMA, thanks ;)1 reply 0 retweets 0 likes -
Replying to @cynicalsecurity
@cynicalsecurity@AndreaBarisani Arrigo you need to go to http://infocenter.arm.com :-P Trying to identify display read access security state.2 replies 0 retweets 0 likes -
Replying to @dragosr
@dragosr@cynicalsecurity no, u need to understand that VPU is a peripheral and http://arm.com info and/or MMU play no role here ;)1 reply 0 retweets 0 likes -
Replying to @AndreaBarisani
@AndreaBarisani@cynicalsecurity well if you are certain there are no unexpected ways you can use the display processing tables and DMA...2 replies 0 retweets 0 likes
@dragosr @cynicalsecurity unexpected uses are protected from with the expected TZ aware bus filtering, again this is what TZ is there for
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