linux-kernel - Re: [PATCH] gpu: drm: vmwgfx: fix information leak to userland

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Date:	Mon, 08 Nov 2010 16:40:59 +0100
From:	Thomas Hellstrom <thellstrom@...are.com>
To:	Vasiliy Kulikov <segooon@...il.com>
CC:	"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
	David Airlie <airlied@...ux.ie>,
	Dave Airlie <airlied@...hat.com>,
	Jakob Bornecrantz <jakob@...are.com>,
	Dan Carpenter <error27@...il.com>,
	Jerome Glisse <jglisse@...hat.com>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] gpu: drm: vmwgfx: fix information leak to userland

On 11/06/2010 03:41 PM, Vasiliy Kulikov wrote:
> Structure drm_vmw_fence_rep is copied to userland with field "pad64"
> uninitialized.  It leads to leaking of contents of kernel stack memory.
>
> Signed-off-by: Vasiliy Kulikov<segooon@...il.com>
> ---
>   Compile tested.
>
>   drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c |    1 +
>   1 files changed, 1 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
> index 51d9f9f..76954e3 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
> @@ -691,6 +691,7 @@ int vmw_execbuf_ioctl(struct drm_device *dev, void *data,
>
>   	fence_rep.error = ret;
>   	fence_rep.fence_seq = (uint64_t) sequence;
> +	fence_rep.pad64 = 0;
>
>   	user_fence_rep = (struct drm_vmw_fence_rep __user *)
>   	    (unsigned long)arg->fence_rep;
>    
Reviewed-by: Thomas Hellstrom <thellstrom@...are.com>

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