From the previous reply, I think I misunderstood your question regarding kernel command line. Here’s "cat /proc/cmdline” results for distributions that I’ve experimented.
Ubuntu 14.04 (64-bit):
BOOT_IMAGE=/boot/vmlinuz-3.13.0-58-generic root=UUID=7505f862-ce46-49e5-9d1c-e4e307844889 ro text quiet splash vt.handoff=7
Ubuntu 12.04 (64-bit):
BOOT_IMAGE=/boot/vmlinuz-3.13.0-32-generic root=UUID=5be789be-9b0c-463e-bd18-42bfa79fb24c ro quiet splash
CentOS 7 (64-bit):
BOOT_IMAGE=/vmlinuz-3.10.0-229.el7.x86_64 root=/dev/mapper/centos-root ro rd.lvm.lv=centos/root rd.lvm.lv=centos/swap crashkernel=auto rhgb quiet LANG=en_US.UTF-8
CentOS 6 (64-bit):
ro root=UUID=a7d44560-adcc-4000-9584-8b9fcf2afd74 rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=129M@0M KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet
I don’t see any audit=<value> entries from all examples above.
/Kangkook
On Sep 11, 2015, at 5:50 AM, Richard Guy Briggs <
rgb@redhat.com> wrote:
On 15/09/10, Kangkook Jee wrote:Hi all,
I debugged a bit further to identify distributions that are affected by the issue.
I repeated the same experiment with sshd from 3 more distributions.
CentOS Linux release 7.1.1503 (64-bit, 3.10.0-229.el7.x86_64): Problem NOT reproduced
CentOS release 6.6 (64-bit, 2.6.32-504.el6.x86_64): Problem NOT reproduced
Ubuntu 12.04.5 LTS (64-bit, 3.13.0-32-generic): Problem reproduced
For each of these examples, what is the value of the kernel command line"audit=<value>" if it is even present? It is possible that the CentOSexamples include "audit=1" while Ubuntu omits the line. "cat/proc/cmdline" should tell you the answer.After all, Ubuntu family are affected by the issue and I could confirm
that results are inconsistent across two different distribution
families.
I would be curious what your results are with a recent Debian and with arecent Fedora.If you can let us know how can we workaround the issue, it will be a great help.
Regards, Kangkook
On Sep 9, 2015, at 11:50 PM, Kangkook Jee <aixer77@gmail.com> wrote:
Dear all,
We are developing custom user space audit agent to gather system wide system
call trace. While experimenting with various programs, we found out that
processes (daemons) that started early (along with the system bootstrapping) do
not report any audit events at all. These processes typically fall into PID
range of less than 2000. Here’s how I reproduced the symptom with sshd daemon.
1. Reboot the system
2. Add and enable audit events
# /sbin/auditctl -a exit,always -F arch=b64 -S clone -S close -S creat -S dup
-S dup2 -S dup3 -S execve -S exit -S exit_group -S fork -S open -S openat
-S unlink -S unlinkat -S vfork -S 288 -S accept -S bind -S connect
-S listen -S socket -S socketpair
# /sbin/auditctl -e1 -b 102400
3. Connect to the system via ssh
Audit messages generated only from child processes and none are seen from
the original daemon.
4. Restart sshd
# restart ssh
5. Connect again to the system via ssh
Now, we see audit messages from both parent and child processes.
I did the experiment from Ubuntu 14.04.2 LTS distribution (64-bit, kernel
version 3.13.0-58-generic).
I first wonder whether this is intended behavior of audit framework or
not. If it is intended, I also want to know how can we configure auditd
differently to capture system calls from all processes.
Thanks a lot for your help in advance!
Regards, Kangkook
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