Re: Early processes (daemons) do not report audit events

[Kangkook Jee <aixer77@gmail.com>]

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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

After all, Ubuntu family are affected by the issue and I could confirm that results are inconsistent 
across two different distribution families. 

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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