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I learned that each app is assigned a separate UID so that a rogue app cannot access other apps data and system sensetive data and files.

What's problem with this that they have to use MAC(selinux)

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  • Because DAC is discretionary, and it's up to the discretion of the user/uid (humans in case of Linux distros, apps in case of Android) to enforce or relax the access policy (to files, processes, sockets etc.). MAC is mandatory, so the access policy set by administrator / program developer (in case of Linux distro) or Google / OEM / ROM developer (in case of Android) is mandatory. And humans/apps (or some malware code running in their name) cannot modify it to break the desired security model. Question isn't specific to Android. You'll find better answers in Linux forums
    – Irfan Latif
    Sep 15, 2020 at 21:20

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