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https://github.com/NVIDIA/nvidia-container-toolkit
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0c8723a93a
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. In general the creation of these devices is cosmetic as a container does not have the required cgroup access for the devices. Signed-off-by: Evan Lezar <elezar@nvidia.com>
64 lines
2.1 KiB
Go
64 lines
2.1 KiB
Go
//go:build linux
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/**
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# SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
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# SPDX-License-Identifier: Apache-2.0
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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**/
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package disabledevicenodemodification
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import (
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"fmt"
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"os"
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"path/filepath"
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"github.com/opencontainers/runc/libcontainer/utils"
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"golang.org/x/sys/unix"
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)
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func createParamsFileInContainer(containerRootDirPath string, contents []byte) error {
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tmpRoot, err := os.MkdirTemp("", "nvct-empty-dir*")
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if err != nil {
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return fmt.Errorf("failed to create temp root: %w", err)
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}
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if err := createTmpFs(tmpRoot, len(contents)); err != nil {
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return fmt.Errorf("failed to create tmpfs mount for params file: %w", err)
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}
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modifiedParamsFile, err := os.OpenFile(filepath.Join(tmpRoot, "nvct-params"), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0444)
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if err != nil {
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return fmt.Errorf("failed to open modified params file: %w", err)
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}
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defer modifiedParamsFile.Close()
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if _, err := modifiedParamsFile.Write(contents); err != nil {
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return fmt.Errorf("failed to write temporary params file: %w", err)
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}
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err = utils.WithProcfd(containerRootDirPath, nvidiaDriverParamsPath, func(nvidiaDriverParamsFdPath string) error {
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return unix.Mount(modifiedParamsFile.Name(), nvidiaDriverParamsFdPath, "", unix.MS_BIND|unix.MS_RDONLY|unix.MS_NODEV|unix.MS_PRIVATE|unix.MS_NOSYMFOLLOW, "")
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})
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if err != nil {
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return fmt.Errorf("failed to mount modified params file: %w", err)
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}
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return nil
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}
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func createTmpFs(target string, size int) error {
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return unix.Mount("tmpfs", target, "tmpfs", 0, fmt.Sprintf("size=%d", size))
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}
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