Adding ID check to make sure a dma-buf is exported externally
since hyper_dmabuf only allows to export a dmabuf to a different
VM.
Signed-off-by: Dongwon Kim <dongwon.kim@xxxxxxxxx>
---
drivers/xen/hyper_dmabuf/hyper_dmabuf_ioctl.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/xen/hyper_dmabuf/hyper_dmabuf_ioctl.c b/drivers/xen/hyper_dmabuf/hyper_dmabuf_ioctl.c
index 12f7ce4..b77b156 100644
--- a/drivers/xen/hyper_dmabuf/hyper_dmabuf_ioctl.c
+++ b/drivers/xen/hyper_dmabuf/hyper_dmabuf_ioctl.c
@@ -103,6 +103,12 @@ static int hyper_dmabuf_export_remote_ioctl(struct file *filp, void *data)
export_remote_attr = (struct ioctl_hyper_dmabuf_export_remote *)data;
+ if (hyper_dmabuf_private.domid == export_remote_attr->remote_domain) {
+ dev_err(hyper_dmabuf_private.device,
+ "exporting to the same VM is not permitted\n");
+ return -EINVAL;
+ }
+
dma_buf = dma_buf_get(export_remote_attr->dmabuf_fd);
if (IS_ERR(dma_buf)) {
--
2.7.4
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