Android/Security

From OLPC
< Android
Revision as of 04:02, 24 September 2014 by Quozl (talk | contribs)
Jump to navigation Jump to search

Firmware security for the Android and Sugar build.

  • set up for signing using firmware security and the bios-crypto source,
  • copy /boot/alt/vmlinuz and /boot/alt/initrd.img from the Android build,
  • sign the Android kernel with the deployment operating system (o1) key,
sign-os.sh os vmlinuz runos4.zip
  • sign the Android ramdisk
sign-os.sh os initrd.img runrd4.zip
  • place both in /boot/alt,
  • link the activation mode to the Sugar activation kernel and ramdisk,
ln -s ../runos4.zip actos4.zip
ln -s ../actrd4.zip actrd4.zip
  • For a laptop with expired or missing activation lease, the supplied actrd4.zip must obtain a lease, write it to /security/lease.sig on the first partition, then reboot.
  • For a laptop that is never assigned activation leases, link actos4.zip to the Android runos4.zip, and link actrd4.zip to the Android runrd4.zip, and the firmware will boot Android without obtaining a lease.
  • For a laptop preactivated with the ak tag, actrd4.zip is not used.
  • sign the Q7B40 firmware release with the deployment firmware (w1) key,
  • copy the signed bootfw4.zip file to /boot/
  • test booting using the O game key to select Android, or no O game key to select Sugar, using the X game key to enable security if it is not enabled,
  • test booting using the rocker down key to display the boot menu.