linux-kernel - Re: [PATCH 1/3 RESEND] sched: Remove _

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Date:   Mon, 25 May 2020 23:34:21 +0530
From:   Amol Grover <frextrite@...il.com>
To:     Richard Guy Briggs <rgb@...hat.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        James Morris <jamorris@...ux.microsoft.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jann Horn <jannh@...gle.com>,
        David Howells <dhowells@...hat.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Paul Moore <paul@...l-moore.com>,
        Eric Paris <eparis@...hat.com>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        linux-kernel@...r.kernel.org,
        Madhuparna Bhowmik <madhuparnabhowmik10@...il.com>,
        linux-audit@...hat.com, Joel Fernandes <joel@...lfernandes.org>,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [PATCH 1/3 RESEND] sched: Remove __rcu annotation from cred
 pointer

On Mon, May 25, 2020 at 09:17:41AM -0400, Richard Guy Briggs wrote:
> On 2020-05-24 13:41, Amol Grover wrote:
> > On Thu, Apr 02, 2020 at 11:26:38AM +0530, Amol Grover wrote:
> > > task_struct::cred (subjective credentials) is *always* used
> > > task-synchronously, hence, does not require RCU semantics.
> > > 
> > > task_struct::real_cred (objective credentials) can be used in
> > > RCU context and its __rcu annotation is retained.
> > > 
> > > However, task_struct::cred and task_struct::real_cred *may*
> > > point to the same object, hence, the object pointed to by
> > > task_struct::cred *may* have RCU delayed freeing.
> > > 
> > > Suggested-by: Jann Horn <jannh@...gle.com>
> > > Co-developed-by: Joel Fernandes (Google) <joel@...lfernandes.org>
> > > Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
> > > Signed-off-by: Amol Grover <frextrite@...il.com>
> > 
> > Hello everyone,
> > 
> > Could you please go through patches 1/3 and 2/3 and if deemed OK, give
> > your acks. I sent the original patch in beginning of February (~4 months
> > back) and resent the patches again in beginning of April due to lack of
> > traffic. Paul Moore was kind enough to ack twice - the 3/3 and its
> > resend patch. However these 2 patches still remain. I'd really
> > appreciate if someone reviewed them.
> 
> I asked on April 3 which upstream tree you expect this patchset to go
> through and I did not see a reply.  Do you have a specific target or is
> the large addressee list assuming someone else is taking this set?  All
> we have seen is that it is not intended to go through the audit tree.
> 

Apologies for it. As Paul Moore replied, initially I assumed this
patchset to not go through the audit tree as the audit specific changes
were secondary to the main change (though certainly I did not think
which upstream tree the patchset would go through). But now I am okay
with the patchset making it to upstream via audit tree if it is fine by
the maintainers.

Thanks
Amol

> > Thanks
> > Amol
> 
> - 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
>