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Android System Image Modification

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Understanding Android’s
System
• Mir Saman Tajbakhsh
• https://mstajbakhsh.ir

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Headlines
 Android’s System Image
 System Modification
 System and Platform Apps
 SELinux and MAC Permissions
 System...

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Android System Image
 All Android systems has a system.img which is the main OS including apps and configs
 The system i...

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Android System Image Modification

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A small demonstration of Android System Image and its content.

Resources:
1. Gist by tonio-nucci
https://gist.github.com/tonio-nucci/8ff2894c42c6320a50dc4b70b32a716a
2. https://github.com/mirsamantajbakhsh/AndroidSystemModification
3. https://mstajbakhsh.ir/android-system-image-modification
4. https://youtu.be/yZgYIaSm2ZE

A small demonstration of Android System Image and its content.

Resources:
1. Gist by tonio-nucci
https://gist.github.com/tonio-nucci/8ff2894c42c6320a50dc4b70b32a716a
2. https://github.com/mirsamantajbakhsh/AndroidSystemModification
3. https://mstajbakhsh.ir/android-system-image-modification
4. https://youtu.be/yZgYIaSm2ZE

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Android System Image Modification

  1. 1. Understanding Android’s System • Mir Saman Tajbakhsh • https://mstajbakhsh.ir
  2. 2. Headlines  Android’s System Image  System Modification  System and Platform Apps  SELinux and MAC Permissions  System Rebuild  OEM and Boot
  3. 3. Android System Image  All Android systems has a system.img which is the main OS including apps and configs  The system image is mountable since it is in ext4 file system usually.  But the image should be converted to raw image before mounting.  The Android’s Sparge image can be converted to Raw image using this tool:  https://github.com/anestisb/android-simg2img
  4. 4. System Modification  First of all, we should mount the raw image.  sudo mount –t ext4 –o loop system.img.raw MOUNT_POINT  Then all the system.img is modifiable.  One interesting folder is system📂which contains all system apps and private apps
  5. 5. System and Platform Apps  System apps are applications that placed in /system/ folder.  They can not be removed without root, but can be disabled.  If you’re root, you can move apps to /system folder, so change your app from third party app to system app.  If the application has same signature as the system, therefore you’re platform app and then you have a lots of abilities.
  6. 6. SELinux and MAC Permissions  All file and folders have their special SELinux permission.  The permission should be applied on your apps.  After applying the SELinux permission, you can renew the system signature by creating new signature.  The new signature is placed in MAC.
  7. 7. System Rebuild  After changing the system, you can rebuild the system  After that, you can make the system.img for AP.tar
  8. 8. OEM and Boot  For flashing the system, you should firstly unlock the phone’s boot loader.  You can search the Internet for this matter.  After that, you can flash the custom AP.tar with custom vbmeta for ignoring boot signature of the system.img.
  9. 9. Resources 1. Gist by tonio-nucci https://gist.github.com/tonio-nucci/8ff2894c42c6320a50dc4b70b32a716a 2. https://github.com/mirsamantajbakhsh/AndroidSystemModification 3. https://youtu.be/yZgYIaSm2ZE 4. https://mstajbakhsh.ir/android-system-image-modification

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