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Feds in Catalonia, Spain think everyone using a Google Pixel must be a drug dealer
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
"-1" is not just hypervisors, things like Intel Management and AMD Platform Security Processor can peer into system memory. I have no doubt similar system exist on ARM, I suspect the radio transceiver can also read system memory and read secrets out of the security devices.
I don't think modern phones are trustable devices. They are opaque blackboxes, pretending to have high security but this security only really protects the spyware operators from being notices.
I don't think it's coincidence that the most "secure" and "private" operating system only operates on a very narrow model selection of phones from just one manufacturer. Probably because they have the best technology to keep the inherent backdoor invisible and implausible. A backdoor to a system nobody trusts wouldn't be very useful.
The original post is about how it's so secure the piggies can't get in. Unless the super secret backdoor is only for the shadow government to disappear dissidents with no trace, thus keeping their super secret backdoor secret.