[Bug 997269] Re: dovecot imap broken by apparmor policy

[Janne Snabb]

I am able to reproduce this on a fresh install some times but not
reliably. It would be great if someone who has some apparmor experience
could have a look at this.

Steps to re-produce:

1. Install Ubuntu 12.04 Server from amd64 ISO in a virtual machine and make sure it is up to date:
# apt-get update && apt-get upgrade
# reboot

2. Install dovecot imapd and fetchmail for testing:
# apt-get install dovecot-imapd fetchmail
(I possibly needed to issue "service dovecot start" separately.)

3. Create user who receives mail:
# adduser foobar

4. Make mail directories for the user:
# mkdir -p /home/foobar/Maildir/{cur,new,tmp}

5. Send one e-mail to our user:
# (echo From: foo; echo; echo bar) > /home/foobar/Maildir/new/foo

6. Ensure correct ownership:
# chown -R foobar /home/foobar/Maildir

7. Try to retrieve the mail:
# fetchmail --user foobar --mda cat localhost
Observe success. Ignore warning about certificate. The mail should be output to stdout.

8. Install apparmor-profiles:
# apt-get install apparmor-profiles

9. Reboot to ensure fresh state:
# reboot

10. Send another e-mail:
# (echo From: foo; echo; echo bar) > /home/foobar/Maildir/new/foo2

11. Again, change ownership:
# chown foobar /home/foobar/Maildir/new/foo2

12. Try fetching mail again:
# fetchmail --user foobar --mda cat localhost
You may or may not see a failure here.

13. If there was no failure, open another terminal and log in as foobar, and create a pile of e-mails:
while true ; do ( echo From: foo; echo; echo bar ) > /home/foobar/Maildir/new/foo$SECONDS.$RANDOM ; done
Hit ctrl-C after some time.

14. Try fetching mail again:
# fetchmail --user foobar --mda cat localhost

15. If there was no failure, repeat steps 13 and 14 until the failure is
observed. There will be error entries in /var/log/mail.err when the
problem appears.

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https://bugs.launchpad.net/bugs/997269

Title:
  dovecot imap broken by apparmor policy

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