linux-kernel - Re: [PATCH] drm/ttm: make sure format string cannot leak in

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Message-ID: <CANq1E4Q7mSFyj0chxjH1=wE+ZOL4_WKDwzkvm0GPGunYAfTmBQ@mail.gmail.com>
Date:	Fri, 12 Sep 2014 10:28:11 +0200
From:	David Herrmann <dh.herrmann@...il.com>
To:	Kees Cook <keescook@...omium.org>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	David Airlie <airlied@...ux.ie>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH] drm/ttm: make sure format string cannot leak in

Hi

On Thu, Sep 11, 2014 at 10:53 PM, Kees Cook <keescook@...omium.org> wrote:
> While zone->name is currently hard coded, the call to kobject_init_and_add()
> should follow the more defensive argument list usage (as already done in
> other places in ttm_memory.c) where "%s" is used instead of directly passing
> in a variable as a format string.
>
> Signed-off-by: Kees Cook <keescook@...omium.org>

Reviewed-by: David Herrmann <dh.herrmann@...il.com>

Thanks
David

> ---
>  drivers/gpu/drm/ttm/ttm_memory.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/ttm/ttm_memory.c b/drivers/gpu/drm/ttm/ttm_memory.c
> index fa53df487875..1e688b603e46 100644
> --- a/drivers/gpu/drm/ttm/ttm_memory.c
> +++ b/drivers/gpu/drm/ttm/ttm_memory.c
> @@ -300,7 +300,8 @@ static int ttm_mem_init_highmem_zone(struct ttm_mem_global *glob,
>         zone->glob = glob;
>         glob->zone_highmem = zone;
>         ret = kobject_init_and_add(
> -               &zone->kobj, &ttm_mem_zone_kobj_type, &glob->kobj, zone->name);
> +               &zone->kobj, &ttm_mem_zone_kobj_type, &glob->kobj, "%s",
> +               zone->name);
>         if (unlikely(ret != 0)) {
>                 kobject_put(&zone->kobj);
>                 return ret;
> --
> 1.9.1
>
>
> --
> Kees Cook
> Chrome OS Security
> --
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