netdev - Re: [RFC PATCH ghak90 (was ghak32) V3 02/10] audit: log container info of syscalls

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Message-ID: <20180723151148.hyu4jqy2etp5afpt@madcap2.tricolour.ca>
Date:   Mon, 23 Jul 2018 11:11:48 -0400
From:   Richard Guy Briggs <rgb@...hat.com>
To:     Steve Grubb <sgrubb@...hat.com>
Cc:     Paul Moore <paul@...l-moore.com>, cgroups@...r.kernel.org,
        containers@...ts.linux-foundation.org, linux-api@...r.kernel.org,
        linux-audit@...hat.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        ebiederm@...ssion.com, luto@...nel.org, carlos@...hat.com,
        dhowells@...hat.com, viro@...iv.linux.org.uk, simo@...hat.com,
        Eric Paris <eparis@...isplace.org>, serge@...lyn.com
Subject: Re: [RFC PATCH ghak90 (was ghak32) V3 02/10] audit: log container
 info of syscalls

On 2018-07-23 09:19, Steve Grubb wrote:
> On Sunday, July 22, 2018 4:55:10 PM EDT Richard Guy Briggs wrote:
> > On 2018-07-22 09:32, Steve Grubb wrote:
> > > On Saturday, July 21, 2018 4:29:30 PM EDT Richard Guy Briggs 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));
> > > > > 
> > > > > Can you explain your reason for including an "op" field in this
> > > > > record
> > > > > type?  I've been looking at the rest of the patches in this patchset
> > > > > and it seems to be used more as an indicator of the record's
> > > > > generating context rather than any sort of audit container ID
> > > > > operation.
> > > > 
> > > > "action" might work, but that's netfilter and numeric... "kind"?
> > > > Nothing else really seems to fit from a field name, type or lack of
> > > > searchability perspective.
> > > > 
> > > > Steve, do you have an opinion?
> > > 
> > > We only have 1 sample event where we have op=task. What are the other
> > > possible values?
> > 
> > For the AUDIT_CONTAINER record we have op= "task", "target" (from the
> > ptrace and signals patch), "tty".
> > 
> > For the AUDIT_CONTAINER_ID record we have "op=set".
> 
> Since the purpose of this record is to log the container id, I think that is 
> all that is needed. We can get the context from the other records in the 
> event. I'd suggest dropping the "op" field.

Ok, the information above it for two different audit container
identifier records.  Which one should drop the "op=" field?  Both?  Or
just the AUDIT_CONTAINER record?  The AUDIT_CONTAINER_ID record (which
might be renamed) could use it to distinguish a "set" record from a
dropped audit container identifier that is no longer registered by any
task or namespace.

> -Steve

- 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