Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
MIME-Version: 1.0
References: <cover.1529003588.git.rgb@redhat.com> <907e32319825bb6336a662f4f6f6d173f56f3226.1529003588.git.rgb@redhat.com>
 <CAHC9VhSKcxHScr-ZNQU3iVrqhU4CDKW7tpn3e+NBKAAmnpRP4g@mail.gmail.com>
 <20180712214608.ed4chli7mdc7ymin@madcap2.tricolour.ca> <20180723164035.wkazolpmpf3mvdxw@madcap2.tricolour.ca>
 <CAHC9VhQ3qxHQ6mHhs1JNMg5qr3qJJh2DpD147QWnfsXdM7=rGA@mail.gmail.com> <20180724130203.by5ev4xhaixgzvq5@madcap2.tricolour.ca>
In-Reply-To: <20180724130203.by5ev4xhaixgzvq5@madcap2.tricolour.ca>
From:   Paul Moore <paul@paul-moore.com>
Date:   Tue, 24 Jul 2018 16:17:19 -0400
Message-ID: <CAHC9VhS_QwH+SG9kuVQn3GZ+N=FAuFU-d+TUDn+G4Qkm5xOvHw@mail.gmail.com>
Subject: Re: [RFC PATCH ghak59 V1 3/6] audit: exclude user records from
 syscall context
To:     rgb@redhat.com
Cc:     Eric Paris <eparis@parisplace.org>, linux-audit@redhat.com,
        linux-kernel@vger.kernel.org, sgrubb@redhat.com
Content-Type: text/plain; charset="UTF-8"
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Tue, Jul 24, 2018 at 9:05 AM Richard Guy Briggs <rgb@redhat.com> wrote:
> On 2018-07-23 17:00, Paul Moore wrote:
> > On Mon, Jul 23, 2018 at 12:43 PM Richard Guy Briggs <rgb@redhat.com> wrote:
> > > On 2018-07-12 17:46, Richard Guy Briggs wrote:
> > > > On 2018-06-28 18:11, Paul Moore wrote:
> > > > > On Thu, Jun 14, 2018 at 4:23 PM Richard Guy Briggs <rgb@redhat.com> wrote:
> > > > > > Since the function audit_log_common_recv_msg() is shared by a number of
> > > > > > AUDIT_CONFIG_CHANGE and the entire range of AUDIT_USER_* record types,
> > > > > > and since the AUDIT_CONFIG_CHANGE message type has been converted to a
> > > > > > syscall accompanied record type, special-case the AUDIT_USER_* range of
> > > > > > messages so they remain standalone records.
> > > > > >
> > > > > > See: https://github.com/linux-audit/audit-kernel/issues/59
> > > > > > Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
> > > > > > ---
> > > > > >  kernel/audit.c | 12 +++++++++---
> > > > > >  1 file changed, 9 insertions(+), 3 deletions(-)
> > > > >
> > > > > I think this is fine, but see my previous comment about combining 2/6
> > > > > and 3/6 as a safety measure.
> > > >
> > > > This one I left as a seperate patch for discussion.  We'd previously
> > > > talked about connecting all possible records with syscall records if
> > > > they exist, but this one I'm unsure about, since we don't really care
> > > > what userspace process is issuing this message.  It is just the message
> > > > content itself that is important.  Or is it?  Are we concerned about
> > > > CAP_AUDIT_WRITE holders/abusers and want as much info about them as we
> > > > can get in case they go rogue or pear-shaped?
> > >
> > > I'm waiting on re-spinning this patchset because of this open question.
> > >
> > > Is connecting AUDIT_USER* records desirable or a liability?
> >
> > Like I said, I think special casing the AUDIT_USER* records so they
> > are *not* associated with other records is okay, and perhaps even the
> > right thing to do.  The problem is that we don't have the necessary
> > context (har har) to match any kernel events (and there is the
> > possibility that there are none) to the userspace generated
> > AUDIT_USER* event.  Further, I don't think this is something we would
> > ever be able to solve in a reasonable manner.
>
> Ok, having said that, I think I'd still prefer to keep this patch
> seperate, partly to retain the simplicity of the previous patch and make
> very clear what each one is doing, and partly if we decide to change our
> mind in the future that these AUDIT_USER* records should be autonomous.

Okay, I'll buy that argument.

-- 
paul moore
www.paul-moore.com