[Bug 2107332] Re: AppArmor denied audit messages related to __pycache__ in dmesg

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: subiquity (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/2107332

Title:
  AppArmor denied audit messages related to __pycache__ in dmesg

Status in subiquity package in Ubuntu:
  Confirmed
Status in ubuntu-advantage-tools package in Ubuntu:
  Triaged

Bug description:
  Description of the problem
  Every night AppArmor denial logs related to trying to write to /lib/python3/dist-packages/uaclient/__pycache__/ are reported in the kernel logs. 

  Steps to reproduce:
  1. Install latest server version of Ubuntu 24.04?

  Expected result:
  Kernel logs to only have unusual messages.

  Actual result:
  Each night output like the following appears in the kernel logs:
  [592502.661712] kauditd_printk_skb: 89 callbacks suppressed
  [592502.661714] audit: type=1400 audit(1744604059.356:1017): apparmor="DENIED" operation="mknod" class="file" profile="ubuntu_pro_apt_news" name="/usr/lib/python3/dist-packages/uaclient/__pycache__/__init__.cpython-312.pyc.126322914539312" pid=91895 comm="python3" requested_mask="c" denied_mask="c" fsuid=0 ouid=0
  [592502.667012] audit: type=1400 audit(1744604059.361:1018): apparmor="DENIED" operation="mknod" class="file" profile="ubuntu_pro_apt_news" name="/usr/lib/python3/dist-packages/uaclient/__pycache__/apt.cpython-312.pyc.126322914712960" pid=91895 comm="python3" requested_mask="c" denied_mask="c" fsuid=0 ouid=0
  [592502.676280] audit: type=1400 audit(1744604059.370:1019): apparmor="DENIED" operation="mknod" class="file" profile="ubuntu_pro_esm_cache" name="/usr/lib/python3/dist-packages/uaclient/__pycache__/__init__.cpython-312.pyc.135222400273840" pid=91896 comm="python3" requested_mask="c" denied_mask="c" fsuid=0 ouid=0
  [592502.677457] audit: type=1400 audit(1744604059.372:1020): apparmor="DENIED" operation="mknod" class="file" profile="ubuntu_pro_esm_cache" name="/usr/lib/python3/dist-packages/uaclient/__pycache__/log.cpython-312.pyc.135222401808656" pid=91896 comm="python3" requested_mask="c" denied_mask="c" fsuid=0 ouid=0
  [592502.684794] audit: type=1400 audit(1744604059.379:1021): apparmor="DENIED" operation="mknod" class="file" profile="ubuntu_pro_esm_cache" name="/usr/lib/python3/dist-packages/uaclient/__pycache__/defaults.cpython-312.pyc.135222399178672" pid=91896 comm="python3" requested_mask="c" denied_mask="c" fsuid=0 ouid=0
  [592502.685174] audit: type=1400 audit(1744604059.379:1022): apparmor="DENIED" operation="mknod" class="file" profile="ubuntu_pro_esm_cache" name="/usr/lib/python3/dist-packages/uaclient/__pycache__/secret_manager.cpython-312.pyc.135222399178672" pid=91896 comm="python3" requested_mask="c" denied_mask="c" fsuid=0 ouid=0
  [592502.689781] audit: type=1400 audit(1744604059.384:1023): apparmor="DENIED" operation="mknod" class="file" profile="ubuntu_pro_esm_cache" name="/usr/lib/python3/dist-packages/uaclient/__pycache__/system.cpython-312.pyc.135222399180720" pid=91896 comm="python3" requested_mask="c" denied_mask="c" fsuid=0 ouid=0
  [592502.699986] audit: type=1400 audit(1744604059.394:1024): apparmor="DENIED" operation="mknod" class="file" profile="ubuntu_pro_esm_cache" name="/usr/lib/python3/dist-packages/uaclient/__pycache__/exceptions.cpython-312.pyc.135222399544752" pid=91896 comm="python3" requested_mask="c" denied_mask="c" fsuid=0 ouid=0
  [592502.706501] audit: type=1400 audit(1744604059.401:1025): apparmor="DENIED" operation="mknod" class="file" profile="ubuntu_pro_esm_cache" name="/usr/lib/python3/dist-packages/uaclient/messages/__pycache__/__init__.cpython-312.pyc.135222398418480" pid=91896 comm="python3" requested_mask="c" denied_mask="c" fsuid=0 ouid=0
  [592502.706551] audit: type=1400 audit(1744604059.401:1026): apparmor="DENIED" operation="mknod" class="file" profile="ubuntu_pro_apt_news" name="/usr/lib/python3/dist-packages/uaclient/__pycache__/event_logger.cpython-312.pyc.126322909730864" pid=91895 comm="python3" requested_mask="c" denied_mask="c" fsuid=0 ouid=0

  How reproducible is the problem?
  The problem happens every day.

  Version information
  Ubuntu 24.04.2 LTS
  ubuntu-pro-client 34~24.04 amd64

  Additional information
  Running
  sudo systemctl restart apt-news.service
  makes the messages appear in the logs straightaway.

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