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Message #07685
[Bug 2123870] Re: apparmor several profiles incompatible with new coreutils scheme
It might be ok. It's my understanding that the cups-browsed postinst,
which called apparmor_parser, does not change the loaded profile
(because of the undefined variable), but the last "reloading apparmor
profiles" at the end of the transaction will do it. But I'm going to
confirm that.
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https://bugs.launchpad.net/bugs/2123870
Title:
apparmor several profiles incompatible with new coreutils scheme
Status in akonadi package in Ubuntu:
In Progress
Status in apparmor package in Ubuntu:
Fix Released
Status in bind9 package in Ubuntu:
Invalid
Status in chrony package in Ubuntu:
Invalid
Status in clamav package in Ubuntu:
Invalid
Status in cups-browsed package in Ubuntu:
Confirmed
Status in digikam package in Ubuntu:
Invalid
Status in evince package in Ubuntu:
In Progress
Status in libvirt package in Ubuntu:
In Progress
Status in pollinate package in Ubuntu:
Confirmed
Status in postsrsd package in Ubuntu:
Invalid
Status in surf package in Ubuntu:
In Progress
Status in swtpm package in Ubuntu:
Invalid
Status in tcpdump package in Ubuntu:
Invalid
Status in tor package in Ubuntu:
Invalid
Status in torbrowser-launcher package in Ubuntu:
Invalid
Status in ubuntu-advantage-tools package in Ubuntu:
In Progress
Status in unbound package in Ubuntu:
Invalid
Bug description:
apparmor:5.0.0~alpha1-0ubuntu1 profiles have rules for gnu-coreutils
binaries are incompatible with gnu-coreutils v. 9.5-1ubuntu2 released
on May 08, 2025. Minimally this looks to affect wg-quick profile.
But there may be other profiles that are affected.
gnu-coreutils delivers new symlinks for /usr/bin/cat, /usr/bin/readlink and 105 other utilities in /usr/bin which point to /usr/bin/gnu<toolname>. Apparmor resolves the symlink to the real target path which then breaks any apparmor profile which referenced the format /usr/bin or /usr/sbin utility name.
The result is many DENIED operations for any symlinked gnu-coreutils command.
This bug appears to affect any apparmor profile in Ubuntu questing which happens to set file-based mediation rules for any of the symlinked utilities below:
Any profile which has specific file rules related to these utilities will likely have DENIED messages in Ubuntu questing of the format:
pe=1400 audit(1757953283.765:489): apparmor="DENIED" operation="open" class="file" profile="wg-quick" name="/usr/bin/gnusort" pid=2480 comm="wg-quick" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
2025-09-15T16:19:31.167181+00:00 cloudinit-0915-154438fmhi6o5j kernel: audit: type=1400 audit(1757953171.165:461): apparmor="DENIED" operation="open" class="file" profile="wg-quick"
name="/usr/bin/gnucat" pid=2254 comm="wg-quick" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
2025-09-15T15:55:20.116047+00:00 cloudinit-0915-154438fmhi6o5j kernel:
audit: type=1400 audit(1757951720.114:447): apparmor="DENIED"
operation="open" class="file" profile="wg-quick"
name="/usr/bin/gnureadlink" pid=1977 comm="wg-quick"
requested_mask="r" denied_mask="r" fsuid=0 ouid=0
Symlinked utilities due to gnu-coreutils:
/usr/bin/arch
/usr/bin/b2sum
/usr/bin/base32
/usr/bin/base64
/usr/bin/basename
/usr/bin/basenc
/usr/bin/cat
/usr/bin/chcon
/usr/bin/chgrp
/usr/bin/chmod
/usr/bin/chown
/usr/bin/cksum
/usr/bin/comm
/usr/bin/cp
/usr/bin/csplit
/usr/bin/cut
/usr/bin/date
/usr/bin/dd
/usr/bin/df
/usr/bin/dir
/usr/bin/dircolors
/usr/bin/dirname
/usr/bin/du
/usr/bin/echo
/usr/bin/env
/usr/bin/expand
/usr/bin/expr
/usr/bin/factor
/usr/bin/false
/usr/bin/fmt
/usr/bin/fold
/usr/bin/groups
/usr/bin/head
/usr/bin/hostid
/usr/bin/id
/usr/bin/install
/usr/bin/join
/usr/bin/link
/usr/bin/ln
/usr/bin/logname
/usr/bin/ls
/usr/bin/md5sum
/usr/bin/mkdir
/usr/bin/mkfifo
/usr/bin/mknod
/usr/bin/mktemp
/usr/bin/mv
/usr/bin/nice
/usr/bin/nl
/usr/bin/nohup
/usr/bin/nproc
/usr/bin/numfmt
/usr/bin/od
/usr/bin/paste
/usr/bin/pathchk
/usr/bin/pinky
/usr/bin/pr
/usr/bin/printenv
/usr/bin/printf
/usr/bin/ptx
/usr/bin/pwd
/usr/bin/readlink
/usr/bin/realpath
/usr/bin/rm
/usr/bin/rmdir
/usr/bin/runcon
/usr/bin/seq
/usr/bin/sha1sum
/usr/bin/sha224sum
/usr/bin/sha256sum
/usr/bin/sha384sum
/usr/bin/sha512sum
/usr/bin/shred
/usr/bin/shuf
/usr/bin/sleep
/usr/bin/sort
/usr/bin/split
/usr/bin/stat
/usr/bin/stdbuf
/usr/bin/stty
/usr/bin/sum
/usr/bin/sync
/usr/bin/tac
/usr/bin/tail
/usr/bin/tee
/usr/bin/test
/usr/bin/timeout
/usr/bin/touch
/usr/bin/tr
/usr/bin/true
/usr/bin/truncate
/usr/bin/tsort
/usr/bin/tty
/usr/bin/uname
/usr/bin/unexpand
/usr/bin/uniq
/usr/bin/unlink
/usr/bin/users
/usr/bin/vdir
/usr/bin/wc
/usr/bin/who
/usr/bin/whoami
/usr/bin/yes
/usr/sbin/chroot
### steps to reproduce
lxc launch ubuntu-daily:questing --vm kvm-q
lxc exec kvm-q bash
apt-get update --yes
apt-get install wireguard-tools --yes
modprobe wireguard
su - ubuntu
umask 077
wg genkey > wg0.key
wg pubkey < wg0.key > wg0.pub
<CTRL-D>
root@kvm-q:~# KEY=`cat /home/ubuntu/wg0.key`
root@kvm-q:~# PUBKEY=`cat /home/ubuntu/wg0.pub`
root@kvm-q:~# cat > /etc/wireguard/wg0.conf <<EOF
[Interface]
Address = 192.168.254.1/32
ListenPort = 51820
PrivateKey = ${KEY}
[Peer]
PublicKey = ${PUBKEY}
AllowedIPs = 192.168.254.2/32
EOF
systemctl restart wg-quick@wg
echo $?
journalctl -u wg-quick@wg.service
```
Sep 15 17:49:19 kvm-q systemd[1]: Starting wg-quick@wg.service - WireGuard via wg-quick(8) for wg...
Sep 15 17:49:19 kvm-q wg-quick[1574]: /usr/bin/wg-quick: line 11: /usr/bin/readlink: Permission denied
Sep 15 17:49:19 kvm-q systemd[1]: wg-quick@wg.service: Main process exited, code=exited, status=126/n/a
Sep 15 17:49:19 kvm-q systemd[1]: wg-quick@wg.service: Failed with result 'exit-code'.
Sep 15 17:49:19 kvm-q systemd[1]: Failed to start wg-quick@wg.service - WireGuard via wg-quick(8) for wg.
```
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