123 lines
3.9 KiB
Go
123 lines
3.9 KiB
Go
// Copyright 2020 The gVisor Authors.
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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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package devtmpfs
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import (
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"testing"
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"gvisor.dev/gvisor/pkg/abi/linux"
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"gvisor.dev/gvisor/pkg/fspath"
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"gvisor.dev/gvisor/pkg/sentry/contexttest"
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"gvisor.dev/gvisor/pkg/sentry/fsimpl/tmpfs"
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"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
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"gvisor.dev/gvisor/pkg/sentry/vfs"
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)
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func TestDevtmpfs(t *testing.T) {
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ctx := contexttest.Context(t)
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creds := auth.CredentialsFromContext(ctx)
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vfsObj := &vfs.VirtualFilesystem{}
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if err := vfsObj.Init(); err != nil {
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t.Fatalf("VFS init: %v", err)
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}
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// Register tmpfs just so that we can have a root filesystem that isn't
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// devtmpfs.
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vfsObj.MustRegisterFilesystemType("tmpfs", tmpfs.FilesystemType{}, &vfs.RegisterFilesystemTypeOptions{
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AllowUserMount: true,
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})
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vfsObj.MustRegisterFilesystemType("devtmpfs", &FilesystemType{}, &vfs.RegisterFilesystemTypeOptions{
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AllowUserMount: true,
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})
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// Create a test mount namespace with devtmpfs mounted at "/dev".
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const devPath = "/dev"
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mntns, err := vfsObj.NewMountNamespace(ctx, creds, "tmpfs" /* source */, "tmpfs" /* fsTypeName */, &vfs.GetFilesystemOptions{})
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if err != nil {
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t.Fatalf("failed to create tmpfs root mount: %v", err)
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}
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defer mntns.DecRef()
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root := mntns.Root()
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defer root.DecRef()
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devpop := vfs.PathOperation{
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Root: root,
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Start: root,
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Path: fspath.Parse(devPath),
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}
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if err := vfsObj.MkdirAt(ctx, creds, &devpop, &vfs.MkdirOptions{
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Mode: 0755,
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}); err != nil {
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t.Fatalf("failed to create mount point: %v", err)
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}
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if err := vfsObj.MountAt(ctx, creds, "devtmpfs" /* source */, &devpop, "devtmpfs" /* fsTypeName */, &vfs.MountOptions{}); err != nil {
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t.Fatalf("failed to mount devtmpfs: %v", err)
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}
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a, err := NewAccessor(ctx, vfsObj, creds, "devtmpfs")
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if err != nil {
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t.Fatalf("failed to create devtmpfs.Accessor: %v", err)
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}
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defer a.Release()
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// Create "userspace-initialized" files using a devtmpfs.Accessor.
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if err := a.UserspaceInit(ctx); err != nil {
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t.Fatalf("failed to userspace-initialize devtmpfs: %v", err)
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}
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// Created files should be visible in the test mount namespace.
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abspath := devPath + "/fd"
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target, err := vfsObj.ReadlinkAt(ctx, creds, &vfs.PathOperation{
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Root: root,
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Start: root,
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Path: fspath.Parse(abspath),
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})
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if want := "/proc/self/fd"; err != nil || target != want {
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t.Fatalf("readlink(%q): got (%q, %v), wanted (%q, nil)", abspath, target, err, want)
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}
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// Create a dummy device special file using a devtmpfs.Accessor.
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const (
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pathInDev = "dummy"
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kind = vfs.CharDevice
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major = 12
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minor = 34
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perms = 0600
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wantMode = linux.S_IFCHR | perms
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)
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if err := a.CreateDeviceFile(ctx, pathInDev, kind, major, minor, perms); err != nil {
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t.Fatalf("failed to create device file: %v", err)
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}
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// The device special file should be visible in the test mount namespace.
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abspath = devPath + "/" + pathInDev
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stat, err := vfsObj.StatAt(ctx, creds, &vfs.PathOperation{
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Root: root,
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Start: root,
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Path: fspath.Parse(abspath),
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}, &vfs.StatOptions{
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Mask: linux.STATX_TYPE | linux.STATX_MODE,
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})
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if err != nil {
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t.Fatalf("failed to stat device file at %q: %v", abspath, err)
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}
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if stat.Mode != wantMode {
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t.Errorf("device file mode: got %v, wanted %v", stat.Mode, wantMode)
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}
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if stat.RdevMajor != major {
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t.Errorf("major device number: got %v, wanted %v", stat.RdevMajor, major)
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}
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if stat.RdevMinor != minor {
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t.Errorf("minor device number: got %v, wanted %v", stat.RdevMinor, minor)
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}
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}
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