[Bug 1792564] Re: new version of shim refuses to chainload windows in dualboot

[Mathieu Trudel-Lapierre]

This is identified as a proper "typo" bug in grub, fixing.

** Description changed:

+ [Impact]
+ Dual-boot installs of Ubuntu and Windows 10, and other instances of chainloading another bootloader from grub2.
+ 
+ [Test cases]
+ 1) Install Windows 10
+ 2) Install Ubuntu in a dual-boot setup with the existing Windows 10 install. (resize or install on a second disk)
+ 3) Boot to the "ubuntu" entry in UEFI firmware.
+ 4) Hold Shift to get the grub menu
+ 5) Pick "Windows 10" at the grub menu
+ 
+ Verify that the Windows 10 entry from grub menu correctly boots to
+ Windows 10. Without the patch, there should be a "relocation failed"
+ error message. With the patch, Windows 10 should start normally.
+ 
+ [Regression potential]
+ Regressions would show up as other cases of failure to load the bootloader that is being chainloaded to -- it is not noticeably different than the current failure more (which is also a failure to load the bootloader). Chainload is otherwise unlikely to affect the started loader.
+ 
+ ---
+ 
  package: shim-signed, shim
  
  release:  Ubuntu 18.04.1 LTS
  
  version: shim-signed:amd64 1.37~18.04.1+15+1533136590.3beb971-0ubuntu1
-  shim:amd64 15+1533136590.3beb971-0ubuntu1
+  shim:amd64 15+1533136590.3beb971-0ubuntu1
  
  expected: grub menu loading xubuntu and windows in dualboot
  
  happened: loading xubuntu works, loading windows failes (no error - black screen - no hard disc light flashing)
- I uninstalled shim, shim-signed, disabled 'bionic-updates' and installed old versions 
+ I uninstalled shim, shim-signed, disabled 'bionic-updates' and installed old versions
  shim-signed:amd64 1.34.9.2+13-0ubuntu2
  shim:amd64 13-0ubuntu2
  and boot works well like before.
  
  I enabled 'bionic-updates' and installed the newer versions without
  error and again chainloading of windows fails.

** Changed in: shim-signed (Ubuntu)
       Status: Triaged => Invalid

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https://bugs.launchpad.net/bugs/1792564

Title:
  new version of shim refuses to chainload windows in dualboot

Status in grub2 package in Ubuntu:
  Triaged
Status in shim-signed package in Ubuntu:
  Invalid

Bug description:
  [Impact]
  Dual-boot installs of Ubuntu and Windows 10, and other instances of chainloading another bootloader from grub2.

  [Test cases]
  1) Install Windows 10
  2) Install Ubuntu in a dual-boot setup with the existing Windows 10 install. (resize or install on a second disk)
  3) Boot to the "ubuntu" entry in UEFI firmware.
  4) Hold Shift to get the grub menu
  5) Pick "Windows 10" at the grub menu

  Verify that the Windows 10 entry from grub menu correctly boots to
  Windows 10. Without the patch, there should be a "relocation failed"
  error message. With the patch, Windows 10 should start normally.

  [Regression potential]
  Regressions would show up as other cases of failure to load the bootloader that is being chainloaded to -- it is not noticeably different than the current failure more (which is also a failure to load the bootloader). Chainload is otherwise unlikely to affect the started loader.

  ---

  package: shim-signed, shim

  release:  Ubuntu 18.04.1 LTS

  version: shim-signed:amd64 1.37~18.04.1+15+1533136590.3beb971-0ubuntu1
   shim:amd64 15+1533136590.3beb971-0ubuntu1

  expected: grub menu loading xubuntu and windows in dualboot

  happened: loading xubuntu works, loading windows failes (no error - black screen - no hard disc light flashing)
  I uninstalled shim, shim-signed, disabled 'bionic-updates' and installed old versions
  shim-signed:amd64 1.34.9.2+13-0ubuntu2
  shim:amd64 13-0ubuntu2
  and boot works well like before.

  I enabled 'bionic-updates' and installed the newer versions without
  error and again chainloading of windows fails.

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