[Bug 2072811] Re: Apparmor: New update broke flatpak with `apparmor="DENIED"`

Thu Aug 15 01:16:50 UTC 2024

Hello klo, or anyone else affected,

Accepted apparmor into noble-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/apparmor/4.0.1really4.0.1-0ubuntu0.24.04.3
in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
noble to verification-done-noble. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-noble. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: apparmor (Ubuntu Noble)
       Status: Fix Released => Fix Committed

** Tags removed: verification-done verification-done-noble
** Tags added: verification-needed verification-needed-noble

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https://bugs.launchpad.net/bugs/2072811

Title:
  Apparmor: New update broke flatpak with `apparmor="DENIED"`

Status in apparmor package in Ubuntu:
  Fix Released
Status in apparmor source package in Noble:
  Fix Committed
Status in apparmor source package in Oracular:
  Fix Released

Bug description:
  The recent apparmor update appear to have broken some flatpak's ability to save file, e.g.:
  - org.keepassxc.KeePassXC
  - org.ksnip.ksnip

  It seems update introduced a new profile ("/etc/apparmor.d/bwrap-
  userns-restrict"), which is causing the issue below.

  **** To reproduce ****

  (I'm using KeepassXC as example, but same issue for ksnip):

  1. Install and run KeepassXC

  ```bash
  flatpak install org.keepassxc.KeePassXC
  flatpak run org.keepassxc.KeePassXC
  ```

  2. Got error: "Access error for config file
  /home/****/.var/app/org.keepassxc.KeePassXC/config/keepassxc/keepassxc.ini"

  Looking at `journalctl -f`, I see these apparmor DENIED entries:

  ```txt
  Jul 12 09:44:36 ubuntu2404 systemd[2144]: Started app-flatpak-org.keepassxc.KeePassXC-4010.scope.
  Jul 12 09:44:37 ubuntu2404 kernel: kauditd_printk_skb: 6 callbacks suppressed
  Jul 12 09:44:37 ubuntu2404 kernel: audit: type=1400 audit(1720741477.106:310): apparmor="DENIED" operation="link" class="file" info="Failed name lookup - deleted entry" error=-2 profile="bwrap" name="/home/****/.var/app/org.keepassxc.KeePassXC/config/keepassxc/#317211" pid=4021 comm="keepassxc" requested_mask="l" denied_mask="l" fsuid=1000 ouid=1000
  Jul 12 09:44:37 ubuntu2404 kernel: audit: type=1400 audit(1720741477.106:311): apparmor="DENIED" operation="link" class="file" profile="bwrap" name="/home/****/.var/app/org.keepassxc.KeePassXC/config/keepassxc/keepassxc.ini" pid=4021 comm="keepassxc" requested_mask="l" denied_mask="l" fsuid=1000 ouid=1000 target="/home/****/.var/app/org.keepassxc.KeePassXC/config/keepassxc/#317211"
  Jul 12 09:44:37 ubuntu2404 kernel: audit: type=1400 audit(1720741477.106:312): apparmor="DENIED" operation="link" class="file" info="Failed name lookup - deleted entry" error=-2 profile="unpriv_bwrap" name="/home/****/.var/app/org.keepassxc.KeePassXC/config/keepassxc/#317211" pid=4021 comm="keepassxc" requested_mask="l" denied_mask="l" fsuid=1000 ouid=1000
  Jul 12 09:44:37 ubuntu2404 kernel: audit: type=1400 audit(1720741477.106:313): apparmor="DENIED" operation="link" class="file" profile="unpriv_bwrap" name="/home/****/.var/app/org.keepassxc.KeePassXC/config/keepassxc/keepassxc.ini" pid=4021 comm="keepassxc" requested_mask="l" denied_mask="l" fsuid=1000 ouid=1000 target="/home/****/.var/app/org.keepassxc.KeePassXC/config/keepassxc/#317211"
  Jul 12 09:44:37 ubuntu2404 kernel: audit: type=1400 audit(1720741477.341:314): apparmor="DENIED" operation="link" class="file" info="Failed name lookup - deleted entry" error=-2 profile="bwrap" name="/home/****/.var/app/org.keepassxc.KeePassXC/config/keepassxc/#317214" pid=4021 comm="keepassxc" requested_mask="l" denied_mask="l" fsuid=1000 ouid=1000
  Jul 12 09:44:37 ubuntu2404 kernel: audit: type=1400 audit(1720741477.341:315): apparmor="DENIED" operation="link" class="file" profile="bwrap" name="/home/****/.var/app/org.keepassxc.KeePassXC/config/keepassxc/keepassxc.ini" pid=4021 comm="keepassxc" requested_mask="l" denied_mask="l" fsuid=1000 ouid=1000 target="/home/****/.var/app/org.keepassxc.KeePassXC/config/keepassxc/#317214"
  Jul 12 09:44:37 ubuntu2404 kernel: audit: type=1400 audit(1720741477.341:316): apparmor="DENIED" operation="link" class="file" info="Failed name lookup - deleted entry" error=-2 profile="unpriv_bwrap" name="/home/****/.var/app/org.keepassxc.KeePassXC/config/keepassxc/#317214" pid=4021 comm="keepassxc" requested_mask="l" denied_mask="l" fsuid=1000 ouid=1000
  Jul 12 09:44:37 ubuntu2404 kernel: audit: type=1400 audit(1720741477.341:317): apparmor="DENIED" operation="link" class="file" profile="unpriv_bwrap" name="/home/****/.var/app/org.keepassxc.KeePassXC/config/keepassxc/keepassxc.ini" pid=4021 comm="keepassxc" requested_mask="l" denied_mask="l" fsuid=1000 ouid=1000 target="/home/****/.var/app/org.keepassxc.KeePassXC/config/keepassxc/#317214"
  Jul 12 09:44:38 ubuntu2404 kernel: audit: type=1400 audit(1720741478.704:318): apparmor="DENIED" operation="link" class="file" info="Failed name lookup - deleted entry" error=-2 profile="bwrap" name="/home/****/.var/app/org.keepassxc.KeePassXC/config/keepassxc/#317217" pid=4021 comm="keepassxc" requested_mask="l" denied_mask="l" fsuid=1000 ouid=1000
  Jul 12 09:44:38 ubuntu2404 kernel: audit: type=1400 audit(1720741478.704:319): apparmor="DENIED" operation="link" class="file" profile="bwrap" name="/home/****/.var/app/org.keepassxc.KeePassXC/config/keepassxc/keepassxc.ini" pid=4021 comm="keepassxc" requested_mask="l" denied_mask="l" fsuid=1000 ouid=1000 target="/home/****/.var/app/org.keepassxc.KeePassXC/config/keepassxc/#317217"
  ```

  **** Workaround ****

  For now, work-around is by disabling "/etc/apparmor.d/bwrap-userns-
  restrict" profile.

  ```bash
  sudo aa-disable /usr/bin/bwrap
  ```

  **** Version info ****
  $ lsb_release -rd
  No LSB modules are available.
  Description:	Ubuntu 24.04 LTS
  Release:	24.04

  $ apt-cache policy apparmor
  apparmor:
    Installed: 4.0.1-0ubuntu0.24.04.2
    Candidate: 4.0.1-0ubuntu0.24.04.2
    Version table:
   *** 4.0.1-0ubuntu0.24.04.2 500 (phased 70%)
          500 http://au.archive.ubuntu.com/ubuntu noble-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       4.0.0-beta3-0ubuntu3 500
          500 http://au.archive.ubuntu.com/ubuntu noble/main amd64 Packages

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