From: Paul Moore <paul@paul-moore.com>
To: Richard Guy Briggs <rgb@redhat.com>
Cc: nhorman@tuxdriver.com, linux-api@vger.kernel.org,
containers@lists.linux-foundation.org,
LKML <linux-kernel@vger.kernel.org>,
dhowells@redhat.com,
Linux-Audit Mailing List <linux-audit@redhat.com>,
netfilter-devel@vger.kernel.org, ebiederm@xmission.com,
simo@redhat.com, netdev@vger.kernel.org,
linux-fsdevel@vger.kernel.org, Eric Paris <eparis@parisplace.org>,
mpatel@redhat.com, Serge Hallyn <serge@hallyn.com>
Subject: Re: [PATCH ghak90 V8 13/16] audit: track container nesting
Date: Thu, 13 Feb 2020 16:49:38 -0500 [thread overview]
Message-ID: <CAHC9VhTM6MDHLcBfwJ_9DCroG0VA-meO770ihjn1sVy6=0JrHw@mail.gmail.com> (raw)
In-Reply-To: <20200205235056.e5365xtgz7rbese2@madcap2.tricolour.ca>
On Wed, Feb 5, 2020 at 6:51 PM Richard Guy Briggs <rgb@redhat.com> wrote:
> On 2020-02-05 18:05, Paul Moore wrote:
> > On Thu, Jan 30, 2020 at 2:28 PM Richard Guy Briggs <rgb@redhat.com> wrote:
> > > On 2020-01-22 16:29, Paul Moore wrote:
> > > > On Tue, Dec 31, 2019 at 2:51 PM Richard Guy Briggs <rgb@redhat.com> wrote:
> > > > >
> > > > > Track the parent container of a container to be able to filter and
> > > > > report nesting.
> > > > >
> > > > > Now that we have a way to track and check the parent container of a
> > > > > container, modify the contid field format to be able to report that
> > > > > nesting using a carrat ("^") separator to indicate nesting. The
> > > > > original field format was "contid=<contid>" for task-associated records
> > > > > and "contid=<contid>[,<contid>[...]]" for network-namespace-associated
> > > > > records. The new field format is
> > > > > "contid=<contid>[^<contid>[...]][,<contid>[...]]".
> > > >
> > > > Let's make sure we always use a comma as a separator, even when
> > > > recording the parent information, for example:
> > > > "contid=<contid>[,^<contid>[...]][,<contid>[...]]"
> > >
> > > The intent here is to clearly indicate and separate nesting from
> > > parallel use of several containers by one netns. If we do away with
> > > that distinction, then we lose that inheritance accountability and
> > > should really run the list through a "uniq" function to remove the
> > > produced redundancies. This clear inheritance is something Steve was
> > > looking for since tracking down individual events/records to show that
> > > inheritance was not aways feasible due to rolled logs or search effort.
> >
> > Perhaps my example wasn't clear. I'm not opposed to the little
> > carat/hat character indicating a container's parent, I just think it
> > would be good to also include a comma *in*addition* to the carat/hat.
>
> Ah, ok. Well, I'd offer that it would be slightly shorter, slightly
> less cluttered and having already written the parser in userspace, I
> think the parser would be slightly simpler.
>
> I must admit, I was a bit puzzled by your snippet of code that was used
> as a prefix to the next item rather than as a postfix to the given item.
>
> Can you say why you prefer the comma in addition?
Generally speaking, I believe that a single delimiter is both easier
for the eyes to parse, and easier/safer for machines to parse as well.
In this particular case I think of the comma as a delimiter and the
carat as a modifier, reusing the carat as a delimiter seems like a bad
idea to me.
> > > > > diff --git a/kernel/audit.c b/kernel/audit.c
> > > > > index ef8e07524c46..68be59d1a89b 100644
> > > > > --- a/kernel/audit.c
> > > > > +++ b/kernel/audit.c
> > > >
> > > > > @@ -492,6 +493,7 @@ void audit_switch_task_namespaces(struct nsproxy *ns, struct task_struct *p)
> > > > > audit_netns_contid_add(new->net_ns, contid);
> > > > > }
> > > > >
> > > > > +void audit_log_contid(struct audit_buffer *ab, u64 contid);
> > > >
> > > > If we need a forward declaration, might as well just move it up near
> > > > the top of the file with the rest of the declarations.
> > >
> > > Ok.
> > >
> > > > > +void audit_log_contid(struct audit_buffer *ab, u64 contid)
> > > > > +{
> > > > > + struct audit_contobj *cont = NULL, *prcont = NULL;
> > > > > + int h;
> > > >
> > > > It seems safer to pass the audit container ID object and not the u64.
> > >
> > > It would also be faster, but in some places it isn't available such as
> > > for ptrace and signal targets. This also links back to the drop record
> > > refcounts to hold onto the contobj until process exit, or signal
> > > delivery.
> > >
> > > What we could do is to supply two potential parameters, a contobj and/or
> > > a contid, and have it use the contobj if it is valid, otherwise, use the
> > > contid, as is done for names and paths supplied to audit_log_name().
> >
> > Let's not do multiple parameters, that begs for misuse, let's take the
> > wrapper function route:
> >
> > func a(int id) {
> > // important stuff
> > }
> >
> > func ao(struct obj) {
> > a(obj.id);
> > }
> >
> > ... and we can add a comment that you *really* should be using the
> > variant that passes an object.
>
> I was already doing that where it available, and dereferencing the id
> for the call. But I see an advantage to having both parameters supplied
> to the function, since it saves us the trouble of dereferencing it,
> searching for the id in the hash list and re-locating the object if the
> object is already available.
I strongly prefer we not do multiple parameters for the same "thing";
I would much rather do the wrapper approach as described above. I
would also like to see us use the audit container ID object as much as
possible, using a bare integer should be a last resort.
--
paul moore
www.paul-moore.com
next prev parent reply other threads:[~2020-02-13 21:49 UTC|newest]
Thread overview: 102+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-31 19:48 [PATCH ghak90 V8 00/16] audit: implement container identifier Richard Guy Briggs
2019-12-31 19:48 ` [PATCH ghak90 V8 01/16] audit: collect audit task parameters Richard Guy Briggs
2019-12-31 19:48 ` [PATCH ghak90 V8 02/16] audit: add container id Richard Guy Briggs
2020-01-22 21:28 ` Paul Moore
2020-01-30 17:53 ` Richard Guy Briggs
2019-12-31 19:48 ` [PATCH ghak90 V8 03/16] audit: read container ID of a process Richard Guy Briggs
2019-12-31 19:48 ` [PATCH ghak90 V8 04/16] audit: convert to contid list to check for orch/engine ownership Richard Guy Briggs
2020-01-22 21:28 ` Paul Moore
2020-02-04 22:51 ` Richard Guy Briggs
2020-02-05 22:40 ` Paul Moore
2019-12-31 19:48 ` [PATCH ghak90 V8 05/16] audit: log drop of contid on exit of last task Richard Guy Briggs
2020-01-22 21:28 ` Paul Moore
2020-02-04 23:02 ` Richard Guy Briggs
2019-12-31 19:48 ` [PATCH ghak90 V8 06/16] audit: log container info of syscalls Richard Guy Briggs
2019-12-31 19:48 ` [PATCH ghak90 V8 07/16] audit: add contid support for signalling the audit daemon Richard Guy Briggs
2020-01-22 21:28 ` Paul Moore
2020-01-23 16:29 ` Richard Guy Briggs
2020-01-23 17:09 ` Paul Moore
2020-01-23 20:04 ` Richard Guy Briggs
2020-01-23 21:35 ` Paul Moore
2020-02-04 23:14 ` Richard Guy Briggs
2020-02-05 22:50 ` Paul Moore
2020-02-12 22:38 ` Steve Grubb
2020-02-13 0:09 ` Paul Moore
2020-02-13 21:44 ` Paul Moore
2020-03-12 19:30 ` Richard Guy Briggs
2020-03-13 16:29 ` Paul Moore
2020-03-13 18:59 ` Richard Guy Briggs
2020-03-18 20:56 ` Paul Moore
2020-03-18 21:26 ` Richard Guy Briggs
2020-03-18 21:42 ` Paul Moore
2020-03-18 21:55 ` Richard Guy Briggs
2020-03-18 22:06 ` Paul Moore
2020-03-19 22:02 ` Richard Guy Briggs
2020-03-24 0:16 ` Paul Moore
2020-03-24 21:01 ` Richard Guy Briggs
2020-03-29 3:11 ` Paul Moore
2020-03-30 13:47 ` Richard Guy Briggs
2020-03-30 14:26 ` Paul Moore
2020-03-30 16:21 ` Richard Guy Briggs
2020-03-30 17:34 ` Paul Moore
2020-03-30 17:49 ` Richard Guy Briggs
2020-03-30 19:55 ` Paul Moore
2020-04-16 20:33 ` Eric W. Biederman
2020-04-16 21:53 ` Paul Moore
2020-04-17 22:23 ` Eric W. Biederman
2020-04-22 17:24 ` Paul Moore
2020-06-08 18:03 ` Richard Guy Briggs
2020-06-17 21:33 ` Paul Moore
2020-06-19 15:22 ` Richard Guy Briggs
2020-03-12 20:27 ` Richard Guy Briggs
2020-03-13 16:42 ` Paul Moore
2020-03-13 16:45 ` Steve Grubb
2020-03-13 16:49 ` Paul Moore
2020-03-13 19:23 ` Richard Guy Briggs
2020-03-18 21:01 ` Paul Moore
2020-03-18 21:41 ` Richard Guy Briggs
2020-03-18 21:47 ` Paul Moore
2020-03-19 21:47 ` Richard Guy Briggs
2020-03-20 21:56 ` Paul Moore
2020-03-25 12:29 ` Richard Guy Briggs
2020-03-29 3:17 ` Paul Moore
2020-03-30 15:23 ` Richard Guy Briggs
2019-12-31 19:48 ` [PATCH ghak90 V8 08/16] audit: add support for non-syscall auxiliary records Richard Guy Briggs
2019-12-31 19:48 ` [PATCH ghak90 V8 09/16] audit: add containerid support for user records Richard Guy Briggs
2019-12-31 19:48 ` [PATCH ghak90 V8 10/16] audit: add containerid filtering Richard Guy Briggs
2019-12-31 19:48 ` [PATCH ghak90 V8 11/16] audit: add support for containerid to network namespaces Richard Guy Briggs
2020-01-22 21:28 ` Paul Moore
2020-02-04 23:42 ` Richard Guy Briggs
2020-02-05 22:51 ` Paul Moore
2019-12-31 19:48 ` [PATCH ghak90 V8 12/16] audit: contid check descendancy and nesting Richard Guy Briggs
2020-01-22 21:29 ` Paul Moore
2020-01-23 21:02 ` Richard Guy Briggs
2020-01-23 21:47 ` Paul Moore
2019-12-31 19:48 ` [PATCH ghak90 V8 13/16] audit: track container nesting Richard Guy Briggs
2020-01-22 21:29 ` Paul Moore
2020-01-30 19:27 ` Richard Guy Briggs
2020-02-05 23:05 ` Paul Moore
2020-02-05 23:50 ` Richard Guy Briggs
2020-02-13 21:49 ` Paul Moore [this message]
2020-03-12 20:51 ` Richard Guy Briggs
2020-03-13 16:47 ` Paul Moore
2020-03-14 22:42 ` Richard Guy Briggs
2020-03-17 18:28 ` Richard Guy Briggs
2020-03-18 21:08 ` Paul Moore
2020-01-31 14:50 ` Steve Grubb
2020-02-04 13:19 ` Richard Guy Briggs
2020-02-04 15:47 ` Steve Grubb
2020-02-04 15:52 ` Paul Moore
2020-02-04 18:12 ` Steve Grubb
2020-02-05 22:57 ` Paul Moore
2019-12-31 19:48 ` [PATCH ghak90 V8 14/16] audit: check contid depth and add limit config param Richard Guy Briggs
2020-01-22 21:29 ` Paul Moore
2019-12-31 19:48 ` [PATCH ghak90 V8 15/16] audit: check contid count per netns and add config param limit Richard Guy Briggs
2020-01-22 21:29 ` Paul Moore
2019-12-31 19:48 ` [PATCH ghak90 V8 16/16] audit: add capcontid to set contid outside init_user_ns Richard Guy Briggs
2020-01-22 21:29 ` Paul Moore
2020-02-05 0:39 ` Richard Guy Briggs
2020-02-05 22:56 ` Paul Moore
2020-02-06 12:51 ` Richard Guy Briggs
2020-02-13 21:58 ` Paul Moore
2020-03-12 21:58 ` Richard Guy Briggs
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