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[Bug 2098704] [NEW] Xenial backport of upstream patch breaks arm64 boot

To: group.of.nepali.translators@xxxxxxxxxxxxxxxxxxx
From: Manuel Diewald <2098704@xxxxxxxxxxxxxxxxxx>
Date: Mon, 17 Feb 2025 18:30:29 -0000
Reply-to: Bug 2098704 <2098704@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx

Public bug reported:

The backport of upstream stable commit 05412471beba "bpf: Take return
from set_memory_ro() into account with bpf_prog_lock_ro()" (linux-6.9.y)
for xenial breaks the boot on arm64 machines in security cycle
s2025.01.13. Note that the backport for bionic that was submitted
together with the xenial version to fix CVE-2024-42068 seems to be fine.

The kernel will hang during or after the EFI stub runs:

BdsDxe: starting Boot0002 "UEFI Misc Device 2" from PciRoot(0x0)/Pci(0x1,0x3)/Pci(0x0,0x0)
error: no suitable video mode found.
Loading Linux 4.4.0-265-generic ...
Loading initial ramdisk ...
EFI stub: Booting Linux Kernel...
EFI stub: Using DTB from configuration table
EFI stub: Exiting boot services and installing virtual address map...

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Invalid

** Affects: linux (Ubuntu Xenial)
     Importance: Undecided
         Status: Triaged

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu)
       Status: New => Invalid

** Changed in: linux (Ubuntu Xenial)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/2098704

Title:
  Xenial backport of upstream patch breaks arm64 boot

Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Xenial:
  Triaged

Bug description:
  The backport of upstream stable commit 05412471beba "bpf: Take return
  from set_memory_ro() into account with bpf_prog_lock_ro()"
  (linux-6.9.y) for xenial breaks the boot on arm64 machines in security
  cycle s2025.01.13. Note that the backport for bionic that was
  submitted together with the xenial version to fix CVE-2024-42068 seems
  to be fine.

  The kernel will hang during or after the EFI stub runs:

  BdsDxe: starting Boot0002 "UEFI Misc Device 2" from PciRoot(0x0)/Pci(0x1,0x3)/Pci(0x0,0x0)
  error: no suitable video mode found.
  Loading Linux 4.4.0-265-generic ...
  Loading initial ramdisk ...
  EFI stub: Booting Linux Kernel...
  EFI stub: Using DTB from configuration table
  EFI stub: Exiting boot services and installing virtual address map...

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