Public bug reported:
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
** Affects: apparmor (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2072811
Title:
Apparmor: New update broke flatpak with `apparmor="DENIED"`
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