linux-kernel - Re: [PATCH 1/2] staging: vc04_services: Fix unportable cast in vchiq_copy_from

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Message-ID: <20161024115851.GM4418@mwanda>
Date:   Mon, 24 Oct 2016 14:58:51 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Michael Zoran <mzoran@...wfest.net>
Cc:     gregkh@...uxfoundation.org, devel@...verdev.osuosl.org,
        daniels@...labora.com, linux-kernel@...r.kernel.org,
        eric@...olt.net, noralf@...nnes.org, popcornmix@...il.com
Subject: Re: [PATCH 1/2] staging: vc04_services: Fix unportable cast in
 vchiq_copy_from_user

On Mon, Oct 24, 2016 at 04:39:49AM -0700, Michael Zoran wrote:
> On Mon, 2016-10-24 at 14:36 +0300, Dan Carpenter wrote:
> > On Mon, Oct 24, 2016 at 04:09:37AM -0700, Michael Zoran wrote:
> > > I didn't think it looked totally correct, but I'm not sure it's any
> > > more broken then what is already in the tree.
> > 
> > It's not more broken.  But better to leave the compile warning there
> > to
> > mark that it is an obvious security problem.
> > 
> > > 
> > > If you can kindly point me to some other source code or
> > > documentation
> > > to look at that is correct, I'm more then willing to fix the patch.
> > > 
> > 
> > I was hoping the maintainers could chip in, because I didn't want to
> > look at the code.  We really need to track which are use pointers and
> > which are kernel pointers.  We can't mix them like this.
> > 
> > regards,
> > dan carpenter
> > 
> 
> The problem is that I'm mostly interested in arm64 ATM, and I don't
> think the existing code works at all with 64 bit pointers.
> 
> Broken as it may be...

It's a security issue.  We'll get this fixed in a day or two.

regards,
dan carpenter