Okay adding the suggested rule
works for me. So it would seem dhclient is treating denied access to comm as a
fatal error.
Interestingly I also had it throw a rejection for capability sys_module
[ 1645.480546] audit: type=1400 audit(1616847221.859:73):
apparmor="DENIED" operation="capable" profile="/{,usr/}sbin/dhclient"
pid=3380 comm="dhclient" capability=16 capname="sys_module"
which should not generally be required anymore. See
https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1759032
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https://bugs.launchpad.net/bugs/1918410
Title:
isc-dhcp-client denied by apparmor
Status in isc-dhcp package in Ubuntu:
Confirmed
Bug description:
Hi, I get weird errors in the audit log, seeing dhclient is being
denied reading its comm or the comm of one of its tasks:
[1383307.827378] audit: type=1400 audit(1615367094.054:162):
apparmor="DENIED" operation="open" profile="/{,usr/}sbin/dhclient"
name="/proc/1095210/task/1095213/comm" pid=1095210 comm="dhclient"
requested_mask="wr" denied_mask="wr" fsuid=0 ouid=0
This might or might not be linked with the fact that I can't get an
IPv4 on this interface. Note that it happened to other, see this
comment:
https://bugs.launchpad.net/ubuntu/+source/apparmor/+bug/1413232/comments/8
Or even an article recommending disabling apparmor for dhclient(!):
https://blog.anthony-jacob.com/perte-dip-v4-sous-ubuntu-20-04-apparmor-et-dhclient/
As I said, I'm not sure this is the root cause of the lack of IPv4 renewal,
because running it manually *does* succeed in getting an IP. And running it in
strace shows the EACCES failure:
[pid 1095210] openat(AT_FDCWD, "/proc/self/task/1095211/comm", O_RDWRstrace:
Process 1095211 attached
) = -1 EACCES (Permission non accordée)
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