[Bug 2099811] Re: Os-prober segmentation fault one message for each partition on same PC

[Alex Murray]

Ah thank for noticing that John, it entirely slipped by me - so in that
case I don't think this is the appropriate fix - the AppArmor team has
worked hard to remove the busybox and other similar profiles that
allowed this bypass so I don't think we should do the same for os-
prober. Instead, since os-prober is not used by default anymore, and the
original use of unshare in os-prober was to make it more robust on
desktop systems etc - why not just remove the use of unshare from it? I
feel this has a small risk of regression AND it avoids introducing an
escape hatch for the unprivileged userns restrictions.

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https://bugs.launchpad.net/bugs/2099811

Title:
  Os-prober segmentation fault one message for each partition on same PC

Status in apparmor package in Ubuntu:
  Confirmed
Status in os-prober package in Ubuntu:
  Confirmed

Bug description:
  Reporting this bug on os-prober, my bug https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/2099662
  was incorrectly attributed to grub

  corrado at corrado-n3-pp-0223:~$ sudo os-prober
  [sudo] password for corrado: 
  find: Failed to restore initial working directory: /home/corrado: Permission denied
  Segmentation fault
  Segmentation fault
  Segmentation fault
  Segmentation fault
  Segmentation fault
  Segmentation fault
  Segmentation fault
  Segmentation fault
  Segmentation fault
  Segmentation fault
  Segmentation fault
  Segmentation fault
  Segmentation fault
  Segmentation fault
  Segmentation fault
  Segmentation fault
  Segmentation fault
  Segmentation fault
  Segmentation fault
  corrado at corrado-n3-pp-0223:~$ 

  Attaching related journal

  ProblemType: Bug
  DistroRelease: Ubuntu 25.04
  Package: os-prober 1.83ubuntu2
  ProcVersionSignature: Ubuntu 6.12.0-15.15-generic 6.12.11
  Uname: Linux 6.12.0-15-generic x86_64
  ApportVersion: 2.31.0+git20250220-0ubuntu2
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Feb 23 15:46:27 2025
  InstallationDate: Installed on 2025-02-23 (0 days ago)
  InstallationMedia: Ubuntu 25.04 "Plucky Puffin" - Daily amd64 (20250223)
  ProcEnviron:
   LANG=en_US.UTF-8
   PATH=(custom, no user)
   SHELL=/bin/bash
   TERM=xterm-256color
   XDG_RUNTIME_DIR=<set>
  SourcePackage: os-prober
  UpgradeStatus: No upgrade log present (probably fresh install)

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