linux-kernel - Re: [PATCH ghak90 V5 10/10] audit: NETFILTER_PKT: record each container ID associated with a netNS

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Date:   Mon, 1 Apr 2019 13:50:13 -0400
From:   Richard Guy Briggs <rgb@...hat.com>
To:     Paul Moore <paul@...l-moore.com>
Cc:     containers@...ts.linux-foundation.org, linux-api@...r.kernel.org,
        Linux-Audit Mailing List <linux-audit@...hat.com>,
        linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
        sgrubb@...hat.com, omosnace@...hat.com, dhowells@...hat.com,
        simo@...hat.com, Eric Paris <eparis@...isplace.org>,
        Serge Hallyn <serge@...lyn.com>, ebiederm@...ssion.com,
        nhorman@...driver.com
Subject: Re: [PATCH ghak90 V5 10/10] audit: NETFILTER_PKT: record each
 container ID associated with a netNS

On 2019-04-01 10:50, Paul Moore wrote:
> On Fri, Mar 15, 2019 at 2:35 PM Richard Guy Briggs <rgb@...hat.com> wrote:
> > Add audit container identifier auxiliary record(s) to NETFILTER_PKT
> > event standalone records.  Iterate through all potential audit container
> > identifiers associated with a network namespace.
> >
> > Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
> > ---
> >  include/linux/audit.h    |  5 +++++
> >  kernel/audit.c           | 41 +++++++++++++++++++++++++++++++++++++++++
> >  net/netfilter/nft_log.c  | 11 +++++++++--
> >  net/netfilter/xt_AUDIT.c | 11 +++++++++--
> >  4 files changed, 64 insertions(+), 4 deletions(-)
> 
> ...
> 
> > diff --git a/kernel/audit.c b/kernel/audit.c
> > index 7fa3194f5342..80ed323feeb5 100644
> > --- a/kernel/audit.c
> > +++ b/kernel/audit.c
> > @@ -451,6 +451,47 @@ void audit_switch_task_namespaces(struct nsproxy *ns, struct task_struct *p)
> >                 audit_netns_contid_add(new->net_ns, contid);
> >  }
> >
> > +/**
> > + * audit_log_netns_contid_list - List contids for the given network namespace
> > + * @net: the network namespace of interest
> > + * @context: the audit context to use
> > + *
> > + * Description:
> > + * Issues a CONTAINER_ID record with a CSV list of contids associated
> > + * with a network namespace to accompany a NETFILTER_PKT record.
> > + */
> > +void audit_log_netns_contid_list(struct net *net, struct audit_context *context)
> > +{
> > +       struct audit_buffer *ab = NULL;
> > +       struct audit_contid *cont;
> > +       bool first = true;
> > +       struct audit_net *aunet;
> > +
> > +       /* Generate AUDIT_CONTAINER_ID record with container ID CSV list */
> > +       rcu_read_lock();
> > +       aunet = net_generic(net, audit_net_id);
> > +       if (!aunet)
> > +               goto out;
> > +       list_for_each_entry_rcu(cont, &aunet->contid_list, list) {
> > +               if (first) {
> 
> This is borderline nit-picky, but it seems like we could get rid of
> "first" and just check to see if "ab" is still NULL.

Yes, this is a better way, thank you.

> > +                       ab = audit_log_start(context, GFP_ATOMIC,
> > +                                            AUDIT_CONTAINER_ID);
> > +                       if (!ab) {
> > +                               audit_log_lost("out of memory in audit_log_netns_contid_list");
> > +                               goto out;
> > +                       }
> > +                       audit_log_format(ab, "contid=");
> > +               } else
> > +                       audit_log_format(ab, ",");
> > +               audit_log_format(ab, "%llu", cont->id);
> > +               first = false;
> > +       }
> > +       audit_log_end(ab);
> > +out:
> > +       rcu_read_unlock();
> > +}
> > +EXPORT_SYMBOL(audit_log_netns_contid_list);
> 
> 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