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How does Android partition works? (feddit.it)

submitted 6 days ago by [email protected] to c/programming

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How can it have a system partition which is read only and still make the user create and use its files? How does it differ from Linux in terms of permissions and user management? How are the users kind of "confined" in android?

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[–] [email protected] 6 points 6 days ago

Android is Linux using SELinux for user confinement plus users do not have root access and it uses verified boot to enforce all that.

Keep in mind the system meaning root can do anything it wants. User apps cannot though they can ask the system to do certain things for example by SUID executables for example or other methods. Not sure how android actually does it.

What is different about Android is owner, user, work profiles, and the new private space structure. Not sure low level how that is done but presumably combination of different users, SELinix, and different encryption keys.