Jason Wang
2021-Apr-13 09:15 UTC
[PATCH] vhost-vdpa: fix vm_flags for virtqueue doorbell mapping
The virtqueue doorbell is usually implemented via registeres but we
don't provide the necessary vma->flags like VM_PFNMAP. This may cause
several issues e.g when userspace tries to map the doorbell via vhost
IOTLB, kernel may panic due to the page is not backed by page
structure. This patch fixes this by setting the necessary
vm_flags. With this patch, try to map doorbell via IOTLB will fail
with bad address.
Cc: stable at vger.kernel.org
Fixes: ddd89d0a059d ("vhost_vdpa: support doorbell mapping via mmap")
Signed-off-by: Jason Wang <jasowang at redhat.com>
---
drivers/vhost/vdpa.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index e0a27e336293..865eab69cb71 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -989,6 +989,7 @@ static int vhost_vdpa_mmap(struct file *file, struct
vm_area_struct *vma)
if (vma->vm_end - vma->vm_start != notify.size)
return -ENOTSUPP;
+ vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP;
vma->vm_ops = &vhost_vdpa_vm_ops;
return 0;
}
--
2.25.1