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Diffstat (limited to 'runsc/boot/loader_test.go')
-rw-r--r--runsc/boot/loader_test.go721
1 files changed, 0 insertions, 721 deletions
diff --git a/runsc/boot/loader_test.go b/runsc/boot/loader_test.go
deleted file mode 100644
index b77b4762e..000000000
--- a/runsc/boot/loader_test.go
+++ /dev/null
@@ -1,721 +0,0 @@
-// Copyright 2018 The gVisor Authors.
-//
-// 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 boot
-
-import (
- "fmt"
- "math/rand"
- "os"
- "reflect"
- "syscall"
- "testing"
- "time"
-
- specs "github.com/opencontainers/runtime-spec/specs-go"
- "golang.org/x/sys/unix"
- "gvisor.dev/gvisor/pkg/control/server"
- "gvisor.dev/gvisor/pkg/fd"
- "gvisor.dev/gvisor/pkg/fspath"
- "gvisor.dev/gvisor/pkg/log"
- "gvisor.dev/gvisor/pkg/p9"
- "gvisor.dev/gvisor/pkg/sentry/contexttest"
- "gvisor.dev/gvisor/pkg/sentry/fs"
- "gvisor.dev/gvisor/pkg/sentry/vfs"
- "gvisor.dev/gvisor/pkg/sync"
- "gvisor.dev/gvisor/pkg/unet"
- "gvisor.dev/gvisor/runsc/config"
- "gvisor.dev/gvisor/runsc/fsgofer"
-)
-
-func init() {
- log.SetLevel(log.Debug)
- rand.Seed(time.Now().UnixNano())
- if err := fsgofer.OpenProcSelfFD(); err != nil {
- panic(err)
- }
- config.RegisterFlags()
-}
-
-func testConfig() *config.Config {
- conf, err := config.NewFromFlags()
- if err != nil {
- panic(err)
- }
- // Change test defaults.
- conf.RootDir = "unused_root_dir"
- conf.Network = config.NetworkNone
- conf.DisableSeccomp = true
- return conf
-}
-
-// testSpec returns a simple spec that can be used in tests.
-func testSpec() *specs.Spec {
- return &specs.Spec{
- // The host filesystem root is the sandbox root.
- Root: &specs.Root{
- Path: "/",
- Readonly: true,
- },
- Process: &specs.Process{
- Args: []string{"/bin/true"},
- },
- }
-}
-
-// startGofer starts a new gofer routine serving 'root' path. It returns the
-// sandbox side of the connection, and a function that when called will stop the
-// gofer.
-func startGofer(root string) (int, func(), error) {
- fds, err := syscall.Socketpair(syscall.AF_UNIX, syscall.SOCK_STREAM|syscall.SOCK_CLOEXEC, 0)
- if err != nil {
- return 0, nil, err
- }
- sandboxEnd, goferEnd := fds[0], fds[1]
-
- socket, err := unet.NewSocket(goferEnd)
- if err != nil {
- syscall.Close(sandboxEnd)
- syscall.Close(goferEnd)
- return 0, nil, fmt.Errorf("error creating server on FD %d: %v", goferEnd, err)
- }
- at, err := fsgofer.NewAttachPoint(root, fsgofer.Config{ROMount: true})
- if err != nil {
- return 0, nil, err
- }
- go func() {
- s := p9.NewServer(at)
- if err := s.Handle(socket); err != nil {
- log.Infof("Gofer is stopping. FD: %d, err: %v\n", goferEnd, err)
- }
- }()
- // Closing the gofer socket will stop the gofer and exit goroutine above.
- cleanup := func() {
- if err := socket.Close(); err != nil {
- log.Warningf("Error closing gofer socket: %v", err)
- }
- }
- return sandboxEnd, cleanup, nil
-}
-
-func createLoader(vfsEnabled bool, spec *specs.Spec) (*Loader, func(), error) {
- fd, err := server.CreateSocket(ControlSocketAddr(fmt.Sprintf("%010d", rand.Int())[:10]))
- if err != nil {
- return nil, nil, err
- }
- conf := testConfig()
- conf.VFS2 = vfsEnabled
-
- sandEnd, cleanup, err := startGofer(spec.Root.Path)
- if err != nil {
- return nil, nil, err
- }
-
- // Loader takes ownership of stdio.
- var stdio []int
- for _, f := range []*os.File{os.Stdin, os.Stdout, os.Stderr} {
- newFd, err := unix.Dup(int(f.Fd()))
- if err != nil {
- return nil, nil, err
- }
- stdio = append(stdio, newFd)
- }
-
- args := Args{
- ID: "foo",
- Spec: spec,
- Conf: conf,
- ControllerFD: fd,
- GoferFDs: []int{sandEnd},
- StdioFDs: stdio,
- }
- l, err := New(args)
- if err != nil {
- cleanup()
- return nil, nil, err
- }
- return l, cleanup, nil
-}
-
-// TestRun runs a simple application in a sandbox and checks that it succeeds.
-func TestRun(t *testing.T) {
- doRun(t, false)
-}
-
-// TestRunVFS2 runs TestRun in VFSv2.
-func TestRunVFS2(t *testing.T) {
- doRun(t, true)
-}
-
-func doRun(t *testing.T, vfsEnabled bool) {
- l, cleanup, err := createLoader(vfsEnabled, testSpec())
- if err != nil {
- t.Fatalf("error creating loader: %v", err)
- }
-
- defer l.Destroy()
- defer cleanup()
-
- // Start a goroutine to read the start chan result, otherwise Run will
- // block forever.
- var resultChanErr error
- var wg sync.WaitGroup
- wg.Add(1)
- go func() {
- resultChanErr = <-l.ctrl.manager.startResultChan
- wg.Done()
- }()
-
- // Run the container.
- if err := l.Run(); err != nil {
- t.Errorf("error running container: %v", err)
- }
-
- // We should have not gotten an error on the startResultChan.
- wg.Wait()
- if resultChanErr != nil {
- t.Errorf("error on startResultChan: %v", resultChanErr)
- }
-
- // Wait for the application to exit. It should succeed.
- if status := l.WaitExit(); status.Code != 0 || status.Signo != 0 {
- t.Errorf("application exited with status %+v, want 0", status)
- }
-}
-
-// TestStartSignal tests that the controller Start message will cause
-// WaitForStartSignal to return.
-func TestStartSignal(t *testing.T) {
- doStartSignal(t, false)
-}
-
-// TestStartSignalVFS2 does TestStartSignal with VFS2.
-func TestStartSignalVFS2(t *testing.T) {
- doStartSignal(t, true)
-}
-
-func doStartSignal(t *testing.T, vfsEnabled bool) {
- l, cleanup, err := createLoader(vfsEnabled, testSpec())
- if err != nil {
- t.Fatalf("error creating loader: %v", err)
- }
- defer l.Destroy()
- defer cleanup()
-
- // We aren't going to wait on this application, so the control server
- // needs to be shut down manually.
- defer l.ctrl.srv.Stop()
-
- // Start a goroutine that calls WaitForStartSignal and writes to a
- // channel when it returns.
- waitFinished := make(chan struct{})
- go func() {
- l.WaitForStartSignal()
- // Pretend that Run() executed and returned no error.
- l.ctrl.manager.startResultChan <- nil
- waitFinished <- struct{}{}
- }()
-
- // Nothing has been written to the channel, so waitFinished should not
- // return. Give it a little bit of time to make sure the goroutine has
- // started.
- select {
- case <-waitFinished:
- t.Errorf("WaitForStartSignal completed but it should not have")
- case <-time.After(50 * time.Millisecond):
- // OK.
- }
-
- // Trigger the control server StartRoot method.
- cid := "foo"
- if err := l.ctrl.manager.StartRoot(&cid, nil); err != nil {
- t.Errorf("error calling StartRoot: %v", err)
- }
-
- // Now WaitForStartSignal should return (within a short amount of
- // time).
- select {
- case <-waitFinished:
- // OK.
- case <-time.After(50 * time.Millisecond):
- t.Errorf("WaitForStartSignal did not complete but it should have")
- }
-
-}
-
-type CreateMountTestcase struct {
- name string
- // Spec that will be used to create the mount manager. Note
- // that we can't mount procfs without a kernel, so each spec
- // MUST contain something other than procfs mounted at /proc.
- spec specs.Spec
- // Paths that are expected to exist in the resulting fs.
- expectedPaths []string
-}
-
-func createMountTestcases() []*CreateMountTestcase {
- testCases := []*CreateMountTestcase{
- {
- // Only proc.
- name: "only proc mount",
- spec: specs.Spec{
- Root: &specs.Root{
- Path: os.TempDir(),
- Readonly: true,
- },
- Mounts: []specs.Mount{
- {
- Destination: "/proc",
- Type: "tmpfs",
- },
- },
- },
- // /proc, /dev, and /sys should always be mounted.
- expectedPaths: []string{"/proc", "/dev", "/sys"},
- },
- {
- // Mount at a deep path, with many components that do
- // not exist in the root.
- name: "deep mount path",
- spec: specs.Spec{
- Root: &specs.Root{
- Path: os.TempDir(),
- Readonly: true,
- },
- Mounts: []specs.Mount{
- {
- Destination: "/some/very/very/deep/path",
- Type: "tmpfs",
- },
- {
- Destination: "/proc",
- Type: "tmpfs",
- },
- },
- },
- // /some/deep/path should be mounted, along with /proc, /dev, and /sys.
- expectedPaths: []string{"/some/very/very/deep/path", "/proc", "/dev", "/sys"},
- },
- {
- // Mounts are nested inside each other.
- name: "nested mounts",
- spec: specs.Spec{
- Root: &specs.Root{
- Path: os.TempDir(),
- Readonly: true,
- },
- Mounts: []specs.Mount{
- {
- Destination: "/proc",
- Type: "tmpfs",
- },
- {
- Destination: "/foo",
- Type: "tmpfs",
- },
- {
- Destination: "/foo/qux",
- Type: "tmpfs",
- },
- {
- // File mounts with the same prefix.
- Destination: "/foo/qux-quz",
- Type: "tmpfs",
- },
- {
- Destination: "/foo/bar",
- Type: "tmpfs",
- },
- {
- Destination: "/foo/bar/baz",
- Type: "tmpfs",
- },
- {
- // A deep path that is in foo but not the other mounts.
- Destination: "/foo/some/very/very/deep/path",
- Type: "tmpfs",
- },
- },
- },
- expectedPaths: []string{"/foo", "/foo/bar", "/foo/bar/baz", "/foo/qux",
- "/foo/qux-quz", "/foo/some/very/very/deep/path", "/proc", "/dev", "/sys"},
- },
- {
- name: "mount inside /dev",
- spec: specs.Spec{
- Root: &specs.Root{
- Path: os.TempDir(),
- Readonly: true,
- },
- Mounts: []specs.Mount{
- {
- Destination: "/proc",
- Type: "tmpfs",
- },
- {
- Destination: "/dev",
- Type: "tmpfs",
- },
- {
- // Mounted by runsc by default.
- Destination: "/dev/fd",
- Type: "tmpfs",
- },
- {
- // Mount with the same prefix.
- Destination: "/dev/fd-foo",
- Type: "tmpfs",
- },
- {
- // Unsupported fs type.
- Destination: "/dev/mqueue",
- Type: "mqueue",
- },
- {
- Destination: "/dev/foo",
- Type: "tmpfs",
- },
- {
- Destination: "/dev/bar",
- Type: "tmpfs",
- },
- },
- },
- expectedPaths: []string{"/proc", "/dev", "/dev/fd-foo", "/dev/foo", "/dev/bar", "/sys"},
- },
- {
- name: "mounts inside mandatory mounts",
- spec: specs.Spec{
- Root: &specs.Root{
- Path: os.TempDir(),
- Readonly: true,
- },
- Mounts: []specs.Mount{
- {
- Destination: "/proc",
- Type: "tmpfs",
- },
- {
- Destination: "/sys/bar",
- Type: "tmpfs",
- },
- {
- Destination: "/tmp/baz",
- Type: "tmpfs",
- },
- {
- Destination: "/dev/goo",
- Type: "tmpfs",
- },
- },
- },
- expectedPaths: []string{"/proc", "/sys", "/sys/bar", "/tmp", "/tmp/baz", "/dev/goo"},
- },
- }
-
- return testCases
-}
-
-// Test that MountNamespace can be created with various specs.
-func TestCreateMountNamespace(t *testing.T) {
- for _, tc := range createMountTestcases() {
- t.Run(tc.name, func(t *testing.T) {
- conf := testConfig()
- ctx := contexttest.Context(t)
-
- sandEnd, cleanup, err := startGofer(tc.spec.Root.Path)
- if err != nil {
- t.Fatalf("failed to create gofer: %v", err)
- }
- defer cleanup()
-
- mntr := newContainerMounter(&tc.spec, []*fd.FD{fd.New(sandEnd)}, nil, &podMountHints{})
- mns, err := mntr.createMountNamespace(ctx, conf)
- if err != nil {
- t.Fatalf("failed to create mount namespace: %v", err)
- }
- ctx = fs.WithRoot(ctx, mns.Root())
- if err := mntr.mountSubmounts(ctx, conf, mns); err != nil {
- t.Fatalf("failed to create mount namespace: %v", err)
- }
-
- root := mns.Root()
- defer root.DecRef(ctx)
- for _, p := range tc.expectedPaths {
- maxTraversals := uint(0)
- if d, err := mns.FindInode(ctx, root, root, p, &maxTraversals); err != nil {
- t.Errorf("expected path %v to exist with spec %v, but got error %v", p, tc.spec, err)
- } else {
- d.DecRef(ctx)
- }
- }
- })
- }
-}
-
-// Test that MountNamespace can be created with various specs.
-func TestCreateMountNamespaceVFS2(t *testing.T) {
- for _, tc := range createMountTestcases() {
- t.Run(tc.name, func(t *testing.T) {
- spec := testSpec()
- spec.Mounts = tc.spec.Mounts
- spec.Root = tc.spec.Root
-
- t.Logf("Using root: %q", spec.Root.Path)
- l, loaderCleanup, err := createLoader(true /* VFS2 Enabled */, spec)
- if err != nil {
- t.Fatalf("failed to create loader: %v", err)
- }
- defer l.Destroy()
- defer loaderCleanup()
-
- mntr := newContainerMounter(l.root.spec, l.root.goferFDs, l.k, l.mountHints)
- if err := mntr.processHints(l.root.conf, l.root.procArgs.Credentials); err != nil {
- t.Fatalf("failed process hints: %v", err)
- }
-
- ctx := l.k.SupervisorContext()
- mns, err := mntr.mountAll(l.root.conf, &l.root.procArgs)
- if err != nil {
- t.Fatalf("mountAll: %v", err)
- }
-
- root := mns.Root()
- root.IncRef()
- defer root.DecRef(ctx)
- for _, p := range tc.expectedPaths {
- target := &vfs.PathOperation{
- Root: root,
- Start: root,
- Path: fspath.Parse(p),
- }
-
- if d, err := l.k.VFS().GetDentryAt(ctx, l.root.procArgs.Credentials, target, &vfs.GetDentryOptions{}); err != nil {
- t.Errorf("expected path %v to exist with spec %v, but got error %v", p, tc.spec, err)
- } else {
- d.DecRef(ctx)
- }
- }
- })
- }
-}
-
-// TestRestoreEnvironment tests that the correct mounts are collected from the spec and config
-// in order to build the environment for restoring.
-func TestRestoreEnvironment(t *testing.T) {
- testCases := []struct {
- name string
- spec *specs.Spec
- ioFDs []int
- errorExpected bool
- expectedRenv fs.RestoreEnvironment
- }{
- {
- name: "basic spec test",
- spec: &specs.Spec{
- Root: &specs.Root{
- Path: os.TempDir(),
- Readonly: true,
- },
- Mounts: []specs.Mount{
- {
- Destination: "/some/very/very/deep/path",
- Type: "tmpfs",
- },
- {
- Destination: "/proc",
- Type: "tmpfs",
- },
- },
- },
- ioFDs: []int{0},
- errorExpected: false,
- expectedRenv: fs.RestoreEnvironment{
- MountSources: map[string][]fs.MountArgs{
- "9p": {
- {
- Dev: "9pfs-/",
- Flags: fs.MountSourceFlags{ReadOnly: true},
- DataString: "trans=fd,rfdno=0,wfdno=0,privateunixsocket=true",
- },
- },
- "tmpfs": {
- {
- Dev: "none",
- },
- {
- Dev: "none",
- },
- {
- Dev: "none",
- },
- },
- "devtmpfs": {
- {
- Dev: "none",
- },
- },
- "devpts": {
- {
- Dev: "none",
- },
- },
- "sysfs": {
- {
- Dev: "none",
- },
- },
- },
- },
- },
- {
- name: "bind type test",
- spec: &specs.Spec{
- Root: &specs.Root{
- Path: os.TempDir(),
- Readonly: true,
- },
- Mounts: []specs.Mount{
- {
- Destination: "/dev/fd-foo",
- Type: "bind",
- },
- },
- },
- ioFDs: []int{0, 1},
- errorExpected: false,
- expectedRenv: fs.RestoreEnvironment{
- MountSources: map[string][]fs.MountArgs{
- "9p": {
- {
- Dev: "9pfs-/",
- Flags: fs.MountSourceFlags{ReadOnly: true},
- DataString: "trans=fd,rfdno=0,wfdno=0,privateunixsocket=true",
- },
- {
- Dev: "9pfs-/dev/fd-foo",
- DataString: "trans=fd,rfdno=1,wfdno=1,privateunixsocket=true,cache=remote_revalidating",
- },
- },
- "tmpfs": {
- {
- Dev: "none",
- },
- },
- "devtmpfs": {
- {
- Dev: "none",
- },
- },
- "devpts": {
- {
- Dev: "none",
- },
- },
- "proc": {
- {
- Dev: "none",
- },
- },
- "sysfs": {
- {
- Dev: "none",
- },
- },
- },
- },
- },
- {
- name: "options test",
- spec: &specs.Spec{
- Root: &specs.Root{
- Path: os.TempDir(),
- Readonly: true,
- },
- Mounts: []specs.Mount{
- {
- Destination: "/dev/fd-foo",
- Type: "tmpfs",
- Options: []string{"uid=1022", "noatime"},
- },
- },
- },
- ioFDs: []int{0},
- errorExpected: false,
- expectedRenv: fs.RestoreEnvironment{
- MountSources: map[string][]fs.MountArgs{
- "9p": {
- {
- Dev: "9pfs-/",
- Flags: fs.MountSourceFlags{ReadOnly: true},
- DataString: "trans=fd,rfdno=0,wfdno=0,privateunixsocket=true",
- },
- },
- "tmpfs": {
- {
- Dev: "none",
- Flags: fs.MountSourceFlags{NoAtime: true},
- DataString: "uid=1022",
- },
- {
- Dev: "none",
- },
- },
- "devtmpfs": {
- {
- Dev: "none",
- },
- },
- "devpts": {
- {
- Dev: "none",
- },
- },
- "proc": {
- {
- Dev: "none",
- },
- },
- "sysfs": {
- {
- Dev: "none",
- },
- },
- },
- },
- },
- }
- for _, tc := range testCases {
- t.Run(tc.name, func(t *testing.T) {
- conf := testConfig()
- var ioFDs []*fd.FD
- for _, ioFD := range tc.ioFDs {
- ioFDs = append(ioFDs, fd.New(ioFD))
- }
- mntr := newContainerMounter(tc.spec, ioFDs, nil, &podMountHints{})
- actualRenv, err := mntr.createRestoreEnvironment(conf)
- if !tc.errorExpected && err != nil {
- t.Fatalf("could not create restore environment for test:%s", tc.name)
- } else if tc.errorExpected {
- if err == nil {
- t.Errorf("expected an error, but no error occurred.")
- }
- } else {
- if !reflect.DeepEqual(*actualRenv, tc.expectedRenv) {
- t.Errorf("restore environments did not match for test:%s\ngot:%+v\nwant:%+v\n", tc.name, *actualRenv, tc.expectedRenv)
- }
- }
- })
- }
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-06 04:36:26 +0000