[Bug 2064007] Re: execve from NetworkManager fails - wrong path in app-armor profile?

[Christopher J. Ruwe]

Hi Seth,


sorry to reply that late, had been rather occupied @dayjob. Thanks for your explanation. Th system I noticed the problem on is a box which I steadily bump since 20.4, perhaps even since 19.10. I did not notice the change of the default DHCP-client and do not have any particular fondness for the one over the other, so I just changed the DHCP client.

I will not have the time required to implement and accompany a fix for
the ISC DHCP-client, regrettably.

In any case, thank you very much for your effort.

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https://bugs.launchpad.net/bugs/2064007

Title:
  execve from NetworkManager fails - wrong path in app-armor profile?

Status in isc-dhcp package in Ubuntu:
  New

Bug description:
  Linux <hostname> 6.8.0-31-generic #31-Ubuntu SMP PREEMPT_DYNAMIC Sat
  Apr 20 00:40:06 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux

  
  ```/etc/os-release
  PRETTY_NAME="Ubuntu 24.04 LTS"
  NAME="Ubuntu"
  VERSION_ID="24.04"
  VERSION="24.04 LTS (Noble Numbat)"
  VERSION_CODENAME=noble
  ID=ubuntu
  ID_LIKE=debian
  HOME_URL="https://www.ubuntu.com/"
  SUPPORT_URL="https://help.ubuntu.com/"
  BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
  PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
  UBUNTU_CODENAME=noble
  LOGO=ubuntu-logo
  ```

  
  ```/etc/apparmor.d/sbin.dhclient
  [...]
    # Support the new executable helper from NetworkManager.
    /usr/lib/NetworkManager/nm-dhcp-helper          Pxrm,
    signal (receive) peer=/usr/lib/NetworkManager/nm-dhcp-helper,
  [...]
  ```

  Starting network manager results in
  ```
  /var/log/syslog:2024-04-28T13:35:22.453634+02:00 <hostname> dhclient[<pid>]: execve (/usr/libexec/nm-dhcp-helper, ...): Permission denied
  ```

  `/usr/lib/NetworkManager/nm-dhcp-helper` does not exist on the system.

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