linux-kernel - Re: [PATCH] rcu: kasan: record and print kvfree_call

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Message-ID: <20201120115935.GA8042@pc636>
Date:   Fri, 20 Nov 2020 12:59:35 +0100
From:   Uladzislau Rezki <urezki@...il.com>
To:     Zqiang <qiang.zhang@...driver.com>
Cc:     "Paul E. McKenney" <paulmck@...nel.org>, josh@...htriplett.org,
        rostedt@...dmis.org, joel@...lfernandes.org, rcu@...r.kernel.org,
        linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com,
        urezki@...il.com
Subject: Re: [PATCH] rcu: kasan: record and print kvfree_call_rcu call stack

On Thu, Nov 19, 2020 at 01:49:34PM -0800, Paul E. McKenney wrote:
> On Wed, Nov 18, 2020 at 11:53:09AM +0800, qiang.zhang@...driver.com wrote:
> > From: Zqiang <qiang.zhang@...driver.com>
> > 
> > Add kasan_record_aux_stack function for kvfree_call_rcu function to
> > record call stacks.
> > 
> > Signed-off-by: Zqiang <qiang.zhang@...driver.com>
> 
> Thank you, but this does not apply on the "dev" branch of the -rcu tree.
> See file:///home/git/kernel.org/rcutodo.html for more info.
> 
> Adding others on CC who might have feedback on the general approach.
> 
> 							Thanx, Paul
> 
> > ---
> >  kernel/rcu/tree.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
> > index da3414522285..a252b2f0208d 100644
> > --- a/kernel/rcu/tree.c
> > +++ b/kernel/rcu/tree.c
> > @@ -3506,7 +3506,7 @@ void kvfree_call_rcu(struct rcu_head *head, rcu_callback_t func)
> >  		success = true;
> >  		goto unlock_return;
> >  	}
> > -
> > +	kasan_record_aux_stack(ptr);
Is that save to invoke it on vmalloced ptr.?

--
Vlad Rezki