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Apps can circumvent these ”firewalls” quite easily via IPC/Intents. For example, if you block facebook with a firewall, it can still send an intent to the down

Apps can circumvent these ”firewalls” quite easily via IPC/Intents. For example, if you block facebook with a firewall, it can still send an intent to the download manager to make network connections. (see https://madaidans-insecurities.github.io/android.html#firewalls https://madaidans-insecurities.github.io/android.html#firewa...)

flangola7 3y ago
GrapheneOS is working on a permission to block that too
- zgk7iqea 3y ago
  GrapheneOS alreasy has such a permission. I use it for Apps that shouldn't require internet access, like my keyboard.
  - flangola7 3y ago
    The current network permission does not block IPC