linux-kernel - Re: [PATCH v1 OPT1] driver core: Fix use-after-free and double free on glue directory

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Message-ID: <20190704054126.GD347@kroah.com>
Date:   Thu, 4 Jul 2019 07:41:26 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:     Muchun Song <smuchun@...il.com>, rafael@...nel.org,
        prsood@...eaurora.org, mojha@...eaurora.org, gkohli@...eaurora.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 OPT1] driver core: Fix use-after-free and double free
 on glue directory

On Thu, Jul 04, 2019 at 08:57:53AM +1000, Benjamin Herrenschmidt wrote:
> On Wed, 2019-07-03 at 21:37 +0200, Greg KH wrote:
> > Ok, I guess I have to take this patch, as the other one is so bad :)
> > 
> > But, I need a very large comment here saying why we are poking around in
> > a kref and why we need to do this, at the expense of anything else.
> > 
> > So can you respin this patch with a comment here to help explain it so
> > we have a chance to understand it when we run across this line in 10
> > years?
> 
> Also are we confident that an open dir on the glue dir from userspace
> won't keep the kref up ?

How do you "open" a directory which raises the kref?

thanks,

greg k-h