Add a hook to update nvidia params

If required, this hook creates a modified params file (with ModifyDeviceFiles: 0) in a tmpfs
and mounts this over /proc/driver/nvidia/params.

This prevents device node creation when running tools such as nvidia-smi.

Signed-off-by: Evan Lezar <elezar@nvidia.com>

cmd/nvidia-cdi-hook/update-nvidia-params/mount_linux.go

@@ -0,0 +1,34 @@
+//go:build linux
+// +build linux
+
+/**
+# Copyright (c) 2025, NVIDIA CORPORATION.  All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+**/
+
+package nvidiaparams
+
+import (
+	"fmt"
+
+	"golang.org/x/sys/unix"
+)
+
+func createTmpFs(target string, size int) error {
+	return unix.Mount("tmpfs", target, "tmpfs", 0, fmt.Sprintf("size=%d", size))
+}
+
+func bindMountReadonly(source string, target string) error {
+	return unix.Mount(source, target, "", unix.MS_BIND|unix.MS_RDONLY|unix.MS_NOSYMFOLLOW, "")
+}