kernel-packages team mailing list archive

[Mehmet Kayaalp <1558553@xxxxxxxxxxxxxxxxxx>]

This bug is not fixed yet, since the random bytes are not added to the
build. The attached patch fixes it by adding the step for inserting the
null key during build.

** Patch added: "0001-KEYS-Insert-incompressible-bytes-to-vmlinux-to-reser.patch"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1558553/+attachment/4629379/+files/0001-KEYS-Insert-incompressible-bytes-to-vmlinux-to-reser.patch

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https://bugs.launchpad.net/bugs/1558553

Title:
  IMA-appraisal is unusable in Ubuntu 16.04

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released

Bug description:
  At some point, the IMA keyring changed from _ima to a trusted .ima
  keyring.   At that point, we couldn't add keys to the IMA keyring.
  Other distros import UEFI keys onto the system keyring.  Another
  method of loading keys on the system keyring is needed, which doesn't
  require the UEFI keys or rebuilding the kernel.

  To resolve this problem, the kernel should be built so that
  certificate memory is reserved and randomized.   Two patches are being
  upstreamed in this open window (linux-4.6):

  8e16789 KEYS: Use the symbol value for list size, updated by scripts/insert-sys-cert
  c4c3610 KEYS: Reserve an extra certificate symbol for inserting without recompiling

  We need to include these Kconfig options to reserve the memory:

  CONFIG_SYSTEM_EXTRA_CERTIFICATE=y
  CONFIG_SYSTEM_EXTRA_CERTIFICATE_SIZE=4096

  An additional patch, which will be upstreamed, is needed to fill the
  reserved memory with random data before it is compressed.  (The patch
  is attached.)  After compiling the kernel with the reserved memory,
  the following build step is required:

  scripts/insert-sys-cert -b vmlinux -c /dev/null

  If you want to add a cert, the following command will unpack a
  bzImage, install the cert (DER format) in the vmlinuz, and repack the
  bzImage.

  scripts/insert-sys-cert -s <System.map> -z <bzImage> -c <certfile>

  Contact Information = George Wilson <gcwilson@xxxxxxxxxx> / Mimi Zohar
  <zohar@xxxxxxxxxx>

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