drm: vmwgfx: fix information leak to userland

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@gmail.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
index 51d9f9f..76954e3 100644 (file)
--- 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;