To translate last tweet into English, ARM processors do have microcode in display system you can use to hide a backdoor not in memory
@dragosr @cynicalsecurity no, u need to understand that VPU is a peripheral and http://arm.com info and/or MMU play no role here ;)
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@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. -
@dragosr@cynicalsecurity you are going to love the SDMA core then -
@AndreaBarisani@cynicalsecurity not sure if "love" is exactly the right word, ;-P but thanks very much for pointing this out. -
@dragosr@cynicalsecurity this component is still safely isolated by TZ btw, despite its capabilities -
@AndreaBarisani got that, tho these kinds of components can still present "challenging" functionality for underlying client OS security -
@dragosr indeed, also it takes literally one bit of incorrect TrustZone configuration to make everything fall apart
End of conversation
New conversation -
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