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How to modify sepolicy (SELinux policy)

Added by John R 20 days ago

Hi,

I am looking for a way to modify /sepolicy (found in boot.img) for the purpose of installing a service. For security reasons, I don't want to install additional apps (Magisk or whatever). I want to modify the sepolicy on a computer and push the files directly using adb.

A popular tool called 'sepolicy-inject' does not work properly when trying to add a new domain (throws a segmentation fault). Rebuilding Replicant from source didn't work either (as reported in an issue).

How do you do this, please?