From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Hellstrom Date: Mon, 08 Nov 2010 15:40:59 +0000 Subject: Re: [PATCH] gpu: drm: vmwgfx: fix information leak to userland Message-Id: <4CD81A0B.30209@vmware.com> List-Id: References: <1289054477-18100-1-git-send-email-segooon@gmail.com> In-Reply-To: <1289054477-18100-1-git-send-email-segooon@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Vasiliy Kulikov Cc: Dan Carpenter , "kernel-janitors@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "dri-devel@lists.freedesktop.org" , Jerome Glisse , Dave Airlie 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 > --- > 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