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Mobile Spaces
Mobile Spaces
Mobile Spaces
Mobile Spaces
Mobile Spaces
Mobile Spaces
Mobile Spaces
Mobile Spaces
Mobile Spaces
Mobile Spaces
Mobile Spaces
Mobile Spaces
Mobile Spaces
Mobile Spaces
Mobile Spaces
Mobile Spaces
Mobile Spaces
Mobile Spaces
Mobile Spaces
Mobile Spaces
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Mobile Spaces

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Transcript

  • 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: jobs@mobilespaces.com
  • 20. Q&A

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