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Mobile Spaces



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  • 1. A Sneak Peek IntoAndroid Internals GDG Dec-2012 By Yoav WeissMobileSpaces Founder & CTO
  • 2. What were going to talk about● Virtualizing Android● Understanding Android internals through dynamic tracing
  • 3. What is MobileSpaces● Solving BYOD through a unique virtualization platform● Any app, any device, no root(!)● Funded by Accel Partners
  • 4. Short demo of
  • 5. Android Security Model in a nutshell● The Android security model is based on linux kernel separation● Apps and services run in usermode● Each app is assigned a unique uid and a home directory● Android takes advantage of linux gids● Android permissions are enforced by uid rather than package
  • 6. Application Initialization Process Step 1 - ActivityManager asks the System Server to start Activity/Service/Receiver/Provider * ActivityManager is actually a service running in the system_server process
  • 7. Application Initialization Process Step 2 - System Server checks which package provides that functionality
  • 8. Application Initialization Process Step 3 - System Server tells Zygote to load the package
  • 9. Application Initialization Process Step 4 - Zygote forks and creates the new application process
  • 10. Application Initialization Process Step 5 - The application is set up: ● Check permissions ● Set gid ● Set uid ● Load the package
  • 11. Application Initialization Process Step 6 - The application starts listening for instructions from ActivityManager (Activity lifecycle messages)
  • 12. Virtualizing AndroidSince Android apps and services run inusermode, they must interact with the world viasyscalls.
  • 13. Binder Flow ExampleStep 1 - Camera app asks MediaServer to access the camera
  • 14. Binder Flow ExampleStep 2 - MediaServer asks system_server if camera app is allow to access the camera
  • 15. Binder Flow ExampleStep 3 - system_server grants the permission
  • 16. Binder Flow ExampleStep 4 - MediaServer opens the camera driver and configures it
  • 17. Binder Flow ExampleStep 5 - MediaServer returns the file descriptor to the camera app whichcan now use the camera
  • 18. Live Demos Using the platform
  • 19. Summary● We virtualized Android. No root required● We used the VM to peek into the systemMobileSpaces is hiring!Visit us at: http://www.mobilespaces.somContact us:
  • 20. Q&A