Currently the wutmp abstraction has the following rules: /var/log/lastlog rwk, /var/log/wtmp wk, @{run}/utmp rwk,
According to what I see in my apparmor profiles, just a few apps want to interact with the files listed above, especially with the /var/log/wtmp . But when the apps do this, they sometimes want the read access to this file. An example could be the last command. Is there any reason for not having the r in the rule? The second thing is the file /var/log/btmp (which isn't included in the abstracion). Whenever I see an app, which wants to access the /var/log/wtmp file, it also tries to interact with the /var/log/btmp file, for instance lightdm/sddm or su . Most of the time they need just wk permissions, but sometimes apps need also r on this file, an example could be the lastb command, which is just a link to last.
Signed-off-by: John Johansen john.johansen@canonical.com