The patch below does not apply to the 5.8-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 119c53d2d4044c59c450c4f5a568d80b9d861856 Mon Sep 17 00:00:00 2001
From: Chris Wilson chris@chris-wilson.co.uk Date: Wed, 8 Jul 2020 16:49:11 +0100 Subject: [PATCH] drm/vgem: Replace opencoded version of drm_gem_dumb_map_offset()
drm_gem_dumb_map_offset() now exists and does everything vgem_gem_dump_map does and *ought* to do.
In particular, vgem_gem_dumb_map() was trying to reject mmapping an imported dmabuf by checking the existence of obj->filp. Unfortunately, we always allocated an obj->filp, even if unused for an imported dmabuf. Instead, the drm_gem_dumb_map_offset(), since commit 90378e589192 ("drm/gem: drm_gem_dumb_map_offset(): reject dma-buf"), uses the obj->import_attach to reject such invalid mmaps.
This prevents vgem from allowing userspace mmapping the dumb handle and attempting to incorrectly fault in remote pages belonging to another device, where there may not even be a struct page.
v2: Use the default drm_gem_dumb_map_offset() callback
Fixes: af33a9190d02 ("drm/vgem: Enable dmabuf import interfaces") Signed-off-by: Chris Wilson chris@chris-wilson.co.uk Reviewed-by: Daniel Vetter daniel.vetter@ffwll.ch Cc: stable@vger.kernel.org # v4.13+ Link: https://patchwork.freedesktop.org/patch/msgid/20200708154911.21236-1-chris@c...
diff --git a/drivers/gpu/drm/vgem/vgem_drv.c b/drivers/gpu/drm/vgem/vgem_drv.c index e4dc7b267a0b..a775feda1cc7 100644 --- a/drivers/gpu/drm/vgem/vgem_drv.c +++ b/drivers/gpu/drm/vgem/vgem_drv.c @@ -230,32 +230,6 @@ static int vgem_gem_dumb_create(struct drm_file *file, struct drm_device *dev, return 0; }
-static int vgem_gem_dumb_map(struct drm_file *file, struct drm_device *dev, - uint32_t handle, uint64_t *offset) -{ - struct drm_gem_object *obj; - int ret; - - obj = drm_gem_object_lookup(file, handle); - if (!obj) - return -ENOENT; - - if (!obj->filp) { - ret = -EINVAL; - goto unref; - } - - ret = drm_gem_create_mmap_offset(obj); - if (ret) - goto unref; - - *offset = drm_vma_node_offset_addr(&obj->vma_node); -unref: - drm_gem_object_put(obj); - - return ret; -} - static struct drm_ioctl_desc vgem_ioctls[] = { DRM_IOCTL_DEF_DRV(VGEM_FENCE_ATTACH, vgem_fence_attach_ioctl, DRM_RENDER_ALLOW), DRM_IOCTL_DEF_DRV(VGEM_FENCE_SIGNAL, vgem_fence_signal_ioctl, DRM_RENDER_ALLOW), @@ -446,7 +420,6 @@ static struct drm_driver vgem_driver = { .fops = &vgem_driver_fops,
.dumb_create = vgem_gem_dumb_create, - .dumb_map_offset = vgem_gem_dumb_map,
.prime_handle_to_fd = drm_gem_prime_handle_to_fd, .prime_fd_to_handle = drm_gem_prime_fd_to_handle,