netdev - Re: [PATCH ghak90 (was ghak32) V4 03/10] audit: log container info of syscalls

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Message-ID: <20181025122732.4j4rbychjse3gemt@madcap2.tricolour.ca>
Date:   Thu, 25 Oct 2018 08:27:32 -0400
From:   Richard Guy Briggs <rgb@...hat.com>
To:     Paul Moore <paul@...l-moore.com>
Cc:     sgrubb@...hat.com, simo@...hat.com, carlos@...hat.com,
        linux-api@...r.kernel.org, containers@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, dhowells@...hat.com,
        linux-audit@...hat.com, netfilter-devel@...r.kernel.org,
        ebiederm@...ssion.com, luto@...nel.org, netdev@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, Eric Paris <eparis@...isplace.org>,
        Serge Hallyn <serge@...lyn.com>, viro@...iv.linux.org.uk
Subject: Re: [PATCH ghak90 (was ghak32) V4 03/10] audit: log container info
 of syscalls

On 2018-10-25 06:49, Paul Moore wrote:
> On Thu, Oct 25, 2018 at 2:06 AM Steve Grubb <sgrubb@...hat.com> wrote:
> > On Wed, 24 Oct 2018 20:42:55 -0400
> > Richard Guy Briggs <rgb@...hat.com> wrote:
> > > On 2018-10-24 16:55, Paul Moore wrote:
> > > > On Wed, Oct 24, 2018 at 11:15 AM Richard Guy Briggs
> > > > <rgb@...hat.com> wrote:
> > > > > On 2018-10-19 19:16, Paul Moore wrote:
> > > > > > On Sun, Aug 5, 2018 at 4:32 AM Richard Guy Briggs
> > > > > > <rgb@...hat.com> wrote:
> 
> ...
> 
> > > > > > > +/*
> > > > > > > + * audit_log_contid - report container info
> > > > > > > + * @tsk: task to be recorded
> > > > > > > + * @context: task or local context for record
> > > > > > > + * @op: contid string description
> > > > > > > + */
> > > > > > > +int audit_log_contid(struct task_struct *tsk,
> > > > > > > +                            struct audit_context *context,
> > > > > > > char *op) +{
> > > > > > > +       struct audit_buffer *ab;
> > > > > > > +
> > > > > > > +       if (!audit_contid_set(tsk))
> > > > > > > +               return 0;
> > > > > > > +       /* Generate AUDIT_CONTAINER record with container ID
> > > > > > > */
> > > > > > > +       ab = audit_log_start(context, GFP_KERNEL,
> > > > > > > AUDIT_CONTAINER);
> > > > > > > +       if (!ab)
> > > > > > > +               return -ENOMEM;
> > > > > > > +       audit_log_format(ab, "op=%s contid=%llu",
> > > > > > > +                        op, audit_get_contid(tsk));
> > > > > > > +       audit_log_end(ab);
> > > > > > > +       return 0;
> > > > > > > +}
> > > > > > > +EXPORT_SYMBOL(audit_log_contid);
> > > > > >
> > > > > > As discussed in the previous iteration of the patch, I prefer
> > > > > > AUDIT_CONTAINER_ID here over AUDIT_CONTAINER.  If you feel
> > > > > > strongly about keeping it as-is with AUDIT_CONTAINER I suppose
> > > > > > I could live with that, but it is isn't my first choice.
> > > > >
> > > > > I don't have a strong opinion on this one, mildly preferring the
> > > > > shorter one only because it is shorter.
> > > >
> > > > We already have multiple AUDIT_CONTAINER* record types, so it seems
> > > > as though we should use "AUDIT_CONTAINER" as a prefix of sorts,
> > > > rather than a type itself.
> > >
> > > I'm fine with that.  I'd still like to hear Steve's input.  He had
> > > stronger opinions than me.
> >
> > The creation event should be separate and distinct from the continuing
> > use when its used as a supplemental record. IOW, binding the ID to a
> > container is part of the lifecycle and needs to be kept distinct.
> 
> Steve's comment is pretty ambiguous when it comes to AUDIT_CONTAINER
> vs AUDIT_CONTAINER_ID, but one could argue that AUDIT_CONTAINER_ID
> helps distinguish the audit container id marking record and gets to
> what I believe is the spirit of Steve's comment.  Taking this in
> context with my previous remarks, let's switch to using
> AUDIT_CONTAINER_ID.

I suspect Steve is mixing up AUDIT_CONTAINER_OP with AUDIT_CONTAINER_ID,
confusing the fact that they are two seperate records.  As a summary,
the suggested records are:
	CONTAINER_OP	audit container identifier creation
	CONTAINER	audit container identifier aux record to an event

and what Paul is suggesting (which is fine by me) is:
	CONTAINER_OP	audit container identifier creation event
	CONTAINER_ID	audit container identifier aux record to an event

Steve, please indicate you are fine with this.

> paul moore

- RGB

--
Richard Guy Briggs <rgb@...hat.com>
Sr. S/W Engineer, Kernel Security, Base Operating Systems
Remote, Ottawa, Red Hat Canada
IRC: rgb, SunRaycer
Voice: +1.647.777.2635, Internal: (81) 32635