linux-kernel - Re: [PATCH] gpio: prevent potential speculation leaks in gpio_device_get

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Date: Fri, 17 May 2024 08:00:54 +0000
From: Hagar Hemdan <hagarhem@...zon.com>
To: Kent Gibson <warthog618@...il.com>
CC: Norbert Manthey <nmanthey@...zon.de>, Bartosz Golaszewski <brgl@...ev.pl>,
	Linus Walleij <linus.walleij@...aro.org>, <linux-gpio@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <hagarhem@...zon.com>
Subject: Re: [PATCH] gpio: prevent potential speculation leaks in
 gpio_device_get_desc()

On Fri, May 17, 2024 at 12:22:39AM +0800, Kent Gibson wrote:
> On Thu, May 16, 2024 at 10:55:40PM +0800, Kent Gibson wrote:
> > On Thu, May 16, 2024 at 12:57:42PM +0000, Hagar Hemdan wrote:
> > > On Tue, May 14, 2024 at 08:42:21PM +0800, Kent Gibson wrote:
> >
> > Now I need to test your patch to see what it actually does.
> >
> 
> Tested.  Fails.  It does what I thought it would - clamps the offset into
> bounds BEFORE the call to gpio_device_get_desc().
> 
> The appropriate place for this fix is in gpio_device_get_desc(), after
> the bounds check.
> 
> Cheers,
> Kent.
>
yes, you are right. The speculation macro should be after the bounds
check. I missed this property this time.
I will fix it in v2.

Thanks,
Hagar Hemdan