linux-kernel - Re: [PATCH v3 8/9] drm/rockchip: gem: Don't alloc/free gem buf when dev

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20170405162839.k6q4b3tpt6t2s3zm@art_vandelay>
Date:   Wed, 5 Apr 2017 12:28:40 -0400
From:   Sean Paul <seanpaul@...omium.org>
To:     Jeffy Chen <jeffy.chen@...k-chips.com>
Cc:     linux-kernel@...r.kernel.org, briannorris@...omium.org,
        dianders@...omium.org, tfiga@...omium.org, seanpaul@...omium.org,
        zyw@...k-chips.com, mark.yao@...k-chips.com,
        Heiko Stuebner <heiko@...ech.de>,
        dri-devel@...ts.freedesktop.org,
        linux-rockchip@...ts.infradead.org,
        David Airlie <airlied@...ux.ie>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 8/9] drm/rockchip: gem: Don't alloc/free gem buf when
 dev_private is invalid

On Wed, Apr 05, 2017 at 04:29:26PM +0800, Jeffy Chen wrote:
> After unbinding drm, the userspace may still has a chance to access
> gem buf.
> 
> Add a sanity check for a NULL dev_private to prevent that from
> happening.

I still don't understand how this is happening. You're saying that these hooks
can be called after rockchip_drm_unbind() has finished? 

Sean

> 
> Signed-off-by: Jeffy Chen <jeffy.chen@...k-chips.com>
> ---
> 
> Changes in v3:
> Address Daniel Vetter <daniel@...ll.ch>'s comments.
> Update commit message.
> 
> Changes in v2: None
> 
>  drivers/gpu/drm/rockchip/rockchip_drm_gem.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
> index df9e570..205a3dc 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
> @@ -184,6 +184,9 @@ static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj,
>  	struct drm_device *drm = obj->dev;
>  	struct rockchip_drm_private *private = drm->dev_private;
>  
> +	if (!private)
> +		return -ENODEV;
> +
>  	if (private->domain)
>  		return rockchip_gem_alloc_iommu(rk_obj, alloc_kmap);
>  	else
> @@ -208,6 +211,11 @@ static void rockchip_gem_free_dma(struct rockchip_gem_object *rk_obj)
>  
>  static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj)
>  {
> +	struct drm_device *drm = rk_obj->base.dev;
> +
> +	if (!drm->dev_private)
> +		return;
> +
>  	if (rk_obj->pages)
>  		rockchip_gem_free_iommu(rk_obj);
>  	else
> -- 
> 2.1.4
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS