linux-kernel - Re: [PATCH ghak25 v5] audit: add subj creds to NETFILTER

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Date:   Tue, 19 May 2020 15:18:23 -0400
From:   Paul Moore <paul@...l-moore.com>
To:     Richard Guy Briggs <rgb@...hat.com>
Cc:     Linux-Audit Mailing List <linux-audit@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        netfilter-devel@...r.kernel.org, sgrubb@...hat.com,
        Ondrej Mosnacek <omosnace@...hat.com>, fw@...len.de,
        twoerner@...hat.com, Eric Paris <eparis@...isplace.org>,
        tgraf@...radead.org
Subject: Re: [PATCH ghak25 v5] audit: add subj creds to NETFILTER_CFG record
 to cover async unregister

On Tue, May 19, 2020 at 11:31 AM Richard Guy Briggs <rgb@...hat.com> wrote:
>
> Some table unregister actions seem to be initiated by the kernel to
> garbage collect unused tables that are not initiated by any userspace
> actions.  It was found to be necessary to add the subject credentials to
> cover this case to reveal the source of these actions.  A sample record:
>
> The tty, ses and exe fields have not been included since they are in the
> SYSCALL record and contain nothing useful in the non-user context.
>
>   type=NETFILTER_CFG msg=audit(2020-03-11 21:25:21.491:269) : table=nat family=bridge entries=0 op=unregister pid=153 uid=root auid=unset subj=system_u:system_r:kernel_t:s0 comm=kworker/u4:2

Based on where things were left in the discussion on the previous
draft, I think it would be good if you could explain a bit why the uid
and auid fields are useful here.

-- 
paul moore
www.paul-moore.com