[Bug 1994936] [NEW] initramfs need to mount efivarfs because kernel 6.0 deprecated 'efivars' sysfs interface

[Cyrus Lien]

Public bug reported:

[ Impact ]

kernel 6.0 deprecated efivars sysfs interface [1]. For Intel VROC RAID,
mdadm needs initramfs to mount efivarfs instead.

[1] The commit:
commit 0f5b2c69a4cbe4166ca24b76d5ada98ed2867741
Author: Ard Biesheuvel <ardb at kernel.org>
Date: Mon Jun 20 13:34:03 2022 +0200

    efi: vars: Remove deprecated 'efivars' sysfs interface

[ Test Plan ]

1. Install initramfs-tools
2. update-initramfs -u
3. unmkinitramfs initrd.img-`uname -r` /tmp/extract-initramfs
4. Check if boot script 00_mount_efivarfs exists in directory /tmp/extract-initramfs/main/scripts/init-top/
5. Check /tmp/extract-initramfs/main/scripts/init-top/ORDER if the boot script 00_mount_efivarfs will be execute before udev.

[ Where problems could occur ]

Not sure if there any other tools/utilities also need to mount efivarfs as early as mdadm but the probability of file conflict should be very low.
Also, there are no impact mounting efivarfs multiple times.
mount: /sys/firmware/efi/efivars: efivarfs already mounted on /sys/firmware/efi/efivars.

[ Scope ]

Jammy, Kinetic

[ Other Info ]

The private bug link https://bugs.launchpad.net/somerville/+bug/1990231

debian MR:
https://salsa.debian.org/kernel-team/initramfs-tools/-/merge_requests/66

** Affects: oem-priority
     Importance: Critical
     Assignee: Cyrus Lien (cyruslien)
         Status: Confirmed

** Affects: initramfs-tools (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: initramfs-tools (Debian)
     Importance: Unknown
         Status: Unknown


** Tags: oem-priority

** Also affects: oem-priority
   Importance: Undecided
       Status: New

** Changed in: oem-priority
       Status: New => Confirmed

** Changed in: oem-priority
   Importance: Undecided => Critical

** Changed in: oem-priority
     Assignee: (unassigned) => Cyrus Lien (cyruslien)

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https://bugs.launchpad.net/bugs/1994936

Title:
  initramfs need to mount efivarfs because kernel 6.0 deprecated
  'efivars' sysfs interface

Status in OEM Priority Project:
  Confirmed
Status in initramfs-tools package in Ubuntu:
  New
Status in initramfs-tools package in Debian:
  Unknown

Bug description:
  [ Impact ]

  kernel 6.0 deprecated efivars sysfs interface [1]. For Intel VROC
  RAID, mdadm needs initramfs to mount efivarfs instead.

  [1] The commit:
  commit 0f5b2c69a4cbe4166ca24b76d5ada98ed2867741
  Author: Ard Biesheuvel <ardb at kernel.org>
  Date: Mon Jun 20 13:34:03 2022 +0200

      efi: vars: Remove deprecated 'efivars' sysfs interface

  [ Test Plan ]

  1. Install initramfs-tools
  2. update-initramfs -u
  3. unmkinitramfs initrd.img-`uname -r` /tmp/extract-initramfs
  4. Check if boot script 00_mount_efivarfs exists in directory /tmp/extract-initramfs/main/scripts/init-top/
  5. Check /tmp/extract-initramfs/main/scripts/init-top/ORDER if the boot script 00_mount_efivarfs will be execute before udev.

  [ Where problems could occur ]

  Not sure if there any other tools/utilities also need to mount efivarfs as early as mdadm but the probability of file conflict should be very low.
  Also, there are no impact mounting efivarfs multiple times.
  mount: /sys/firmware/efi/efivars: efivarfs already mounted on /sys/firmware/efi/efivars.

  [ Scope ]

  Jammy, Kinetic

  [ Other Info ]

  The private bug link
  https://bugs.launchpad.net/somerville/+bug/1990231

  debian MR:
  https://salsa.debian.org/kernel-team/initramfs-tools/-/merge_requests/66

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