[Bug 1633629] Re: arm64: KASLR breaks MODVERSIONS

[dann frazier]

On Wed, Dec 14, 2016 at 11:41 AM, Robie Basak
<1633629 at bugs.launchpad.net> wrote:
> 10:41 <rbasak> infinity, dannf: for bug 1633629, shouldn't we be doing
> some testing of other architectures to make sure that we aren't
> regressing something?

Robie,
 Well, it's certainly hard to argue for *less* testing though - a test
on the most popular architecture seems reasonable. I went ahead and
tested a d-i mini.iso install from proposed on an amd64 VM via
virt-manager and observed no regressions. Note that the GA d-i remains
available/usable after updates, so any regressions on other
architectures will have that as a fallback option.

  -dann

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https://bugs.launchpad.net/bugs/1633629

Title:
  arm64: KASLR breaks MODVERSIONS

Status in debian-installer package in Ubuntu:
  Fix Released
Status in debian-installer source package in Yakkety:
  Fix Committed

Bug description:
  [Impact]
  On certain arm64 platforms, modules will not load. This doesn't impact any certified hardware to date, but is known to impact some pre-release platforms, as well as QEMU when a virtio-rng-pci device is attached.

  [Test Case]
  On a xenial/arm64 host, run:

  sudo apt install qemu-system-arm qemu-efi
  wget http://ports.ubuntu.com/ubuntu-ports/dists/yakkety/main/installer-arm64/20101020ubuntu483/images/netboot/mini.iso
  cp /usr/share/AAVMF/AAVMF_CODE.fd flash0.img
  cp /usr/share/AAVMF/AAVMF_VARS.fd flash1.img
  sudo qemu-system-aarch64 -enable-kvm -m 2048 -cpu host -M virt,gic_version=host -nographic -pflash flash0.img -pflash flash1.img -drive file=mini.iso,id=cdrom,if=none,media=cdrom -device virtio-scsi-device -device scsi-cd,drive=cdrom -device virtio-rng-pci

  Select Install from the GRUB menu, and continue through the installer
  menus to "Detect network hardware".

  On failure, the installer will report 'Error while running "modprobe
  -v -b usb-storage"'. On success, it'll continue through to the network
  configuration screens.

  [Regression Risk]
  This will be a simple cherry pick from upstream, so we'll have upstream support w/ any regressions.

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