this post was submitted on 20 Jul 2024
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Privacy
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Honestly trusting the bootloader feels very risky
In that case, have fun coding up your own bootloader and flashing it onto the device. If you can't trust the bootloader, then you can't trust anything at all from the operating system that sits on top of it, because it could be compromised. If you can't trust a bootloader, then the only thing you can trust is a pen and a piece of paper.
True but it feels like obscurity via obscurity.
A huge part of the bootloader stack is opensource....
https://android.googlesource.com/platform/system/core/+/master/fastboot/
https://android.googlesource.com/trusty/lk/trusty/
https://android.googlesource.com/platform/external/avb/
why dont we just put uefi on phones
Phones don't use an IBM-PC architecture. You'd need a phone based on an architecture phones aren't usually based on or You'd need to re-engineer UEFI to work for an architecture it wasn't designed for
UEFI has supported ARM for years now...
And "phones don't use UEFI"
GrapheneOS uses pixels because not even Google employees can break into it.
Yes. Insider Attack Resistance is pretty awesome.
I'd be more worried about the ROM that runs before the bootloader that you can't inspect, or possible hardware implants if you don't trust the bootloader shipped to you from the vendor.
I don't trust it not to be flawed
Ok what is your alternative? Android Verified Boot with a secure hardware keystore like the Google Titan M2 is basically the best thing you can get.
Strong encryption with a password you know only. The password should have a high enthropy
This is unrelated. You want to familiarize yourself with the concept of OS integrity and how it is different from data encryption. You can have a passphrase that encrypts your data alongside having access to these hardware features.
It has very minimal code and its implemented in a robust manner. Unlike UEFI and the desktop implementation of secure boot, it does work well and it has not yet been exploited on pixels. Its way better to have any kind of OS integrity check than none.