linux-kernel - Re: [PATCH v2 6/7] audit: Use task_is_in_init_pid

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Message-ID: <20211215190912.GU1550715@madcap2.tricolour.ca>
Date:   Wed, 15 Dec 2021 14:09:12 -0500
From:   Richard Guy Briggs <rgb@...hat.com>
To:     Paul Moore <paul@...l-moore.com>
Cc:     Leo Yan <leo.yan@...aro.org>, codalist@...emann.coda.cs.cmu.edu,
        Jan Harkes <jaharkes@...cmu.edu>,
        Leon Romanovsky <leon@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        netdev@...r.kernel.org, Balbir Singh <bsingharora@...il.com>,
        linux-kernel@...r.kernel.org, Eric Paris <eparis@...hat.com>,
        coda@...cmu.edu, linux-audit@...hat.com,
        coresight@...ts.linaro.org, Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        linux-arm-kernel@...ts.infradead.org,
        Mike Leach <mike.leach@...aro.org>
Subject: Re: [PATCH v2 6/7] audit: Use task_is_in_init_pid_ns()

On 2021-12-14 17:35, Paul Moore wrote:
> On Wed, Dec 8, 2021 at 3:33 AM Leo Yan <leo.yan@...aro.org> wrote:
> >
> > Replace open code with task_is_in_init_pid_ns() for checking root PID
> > namespace.
> >
> > Signed-off-by: Leo Yan <leo.yan@...aro.org>
> > ---
> >  kernel/audit.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> I'm not sure how necessary this is, but it looks correct to me.

I had the same thought.  I looks correct to me.  I could see the value
if it permitted init_pid_ns to not be global.

> Acked-by: Paul Moore <paul@...l-moore.com>

Reviewed-by: Richard Guy Briggs <rgb@...hat.com>

> > diff --git a/kernel/audit.c b/kernel/audit.c
> > index 121d37e700a6..56ea91014180 100644
> > --- a/kernel/audit.c
> > +++ b/kernel/audit.c
> > @@ -1034,7 +1034,7 @@ static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type)
> >         case AUDIT_MAKE_EQUIV:
> >                 /* Only support auditd and auditctl in initial pid namespace
> >                  * for now. */
> > -               if (task_active_pid_ns(current) != &init_pid_ns)
> > +               if (!task_is_in_init_pid_ns(current))
> >                         return -EPERM;
> >
> >                 if (!netlink_capable(skb, CAP_AUDIT_CONTROL))
> > --
> > 2.25.1
> 
> 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