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Add test that runs
runsc do inside a non-gVisor container.
This is used in contexts such as Dangerzone: https://gvisor.dev/blog/2024/09/23/safe-ride-into-the-dangerzone/ Updates issue #10944. PiperOrigin-RevId: 681229280
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,236 @@ | ||
| // Copyright 2024 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 integration provides end-to-end integration tests for runsc. | ||
| package integration | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "slices" | ||
| "strings" | ||
| "testing" | ||
|
|
||
| "github.com/docker/docker/api/types/mount" | ||
| "gvisor.dev/gvisor/pkg/test/dockerutil" | ||
| "gvisor.dev/gvisor/pkg/test/testutil" | ||
| ) | ||
|
|
||
| // testVariant is a variant of the gVisor in Docker test. | ||
| type testVariant struct { | ||
| Name string | ||
| User string | ||
| WorkDir string | ||
| CapAdd []string | ||
| Args []string | ||
| MountCgroupfs bool | ||
| } | ||
|
|
||
| // run runs the test variant. | ||
| func (test testVariant) run(ctx context.Context, logger testutil.Logger, runscPath string) (string, error) { | ||
| d := dockerutil.MakeNativeContainer(ctx, logger) | ||
| defer d.CleanUp(ctx) | ||
| opts := dockerutil.RunOpts{ | ||
| Image: "basic/integrationtest", | ||
| User: test.User, | ||
| WorkDir: test.WorkDir, | ||
| SecurityOpts: []string{ | ||
| // Disable default seccomp filter which blocks `mount(2)` and others. | ||
| "seccomp=unconfined", | ||
|
|
||
| // Disable AppArmor which also blocks mounts. | ||
| "apparmor=unconfined", | ||
|
|
||
| // Set correct SELinux label; this allows ptrace. | ||
| "label=type:container_engine_t", | ||
| }, | ||
| CapAdd: test.CapAdd, | ||
| Mounts: []mount.Mount{ | ||
| // Mount the runtime binary. | ||
| { | ||
| Type: mount.TypeBind, | ||
| Source: runscPath, | ||
| Target: "/runtime", | ||
| ReadOnly: true, | ||
| }, | ||
| }, | ||
| } | ||
| if test.MountCgroupfs { | ||
| opts.Mounts = append(opts.Mounts, mount.Mount{ | ||
| Type: mount.TypeBind, | ||
| Source: "/sys/fs/cgroup", | ||
| Target: "/sys/fs/cgroup", | ||
| ReadOnly: false, | ||
| }) | ||
| } | ||
| // Mount an unobstructed view of procfs at /proc2 so that the runtime | ||
| // can mount a fresh procfs. | ||
| // TODO(gvisor.dev/issue/10944): Remove this once issue is fixed. | ||
| opts.Mounts = append(opts.Mounts, mount.Mount{ | ||
| Type: mount.TypeBind, | ||
| Source: "/proc", | ||
| Target: "/proc2", | ||
| ReadOnly: false, | ||
| BindOptions: &mount.BindOptions{ | ||
| NonRecursive: true, | ||
| }, | ||
| }) | ||
| const wantMessage = "It became a jumble of words, a litany, almost a kind of glossolalia." | ||
| args := []string{ | ||
| "/runtime", | ||
| "--debug=true", | ||
| "--debug-log=/dev/stderr", | ||
| } | ||
| args = append(args, test.Args...) | ||
| args = append(args, "do", "/bin/echo", wantMessage) | ||
| logger.Logf("Running: %v", args) | ||
| got, err := d.Run(ctx, opts, args...) | ||
| got = strings.TrimSpace(got) | ||
| if err != nil { | ||
| return got, err | ||
| } | ||
| if !strings.Contains(got, wantMessage) { | ||
| return got, fmt.Errorf("did not observe substring %q in logs", wantMessage) | ||
| } | ||
| return got, nil | ||
| } | ||
|
|
||
| // failureCases returns modified versions of this same test that are expected | ||
| // to fail. Verifying that these variants fail ensures that each test variant | ||
| // runs with the minimal amount of deviations from the default configuration. | ||
| func (test testVariant) failureCases() []testVariant { | ||
| failureCase := func(name string) testVariant { | ||
| copy := test | ||
| copy.Name = name | ||
| return copy | ||
| } | ||
| var failureCases []testVariant | ||
| if test.MountCgroupfs { | ||
| copy := failureCase("without cgroupfs mounted") | ||
| copy.MountCgroupfs = false | ||
| failureCases = append(failureCases, copy) | ||
| } | ||
| for i, capAdd := range test.CapAdd { | ||
| copy := failureCase(fmt.Sprintf("without capability %s", capAdd)) | ||
| copy.CapAdd = append(append([]string(nil), test.CapAdd[:i]...), test.CapAdd[i+1:]...) | ||
| failureCases = append(failureCases, copy) | ||
| } | ||
| for _, tryRemoveArg := range []string{ | ||
| "--rootless=true", | ||
| "--ignore-cgroups=true", | ||
| } { | ||
| if index := slices.Index(test.Args, tryRemoveArg); index != -1 { | ||
| copy := failureCase(fmt.Sprintf("without argument %s", tryRemoveArg)) | ||
| copy.Args = append(append([]string(nil), test.Args[:index]...), test.Args[index+1:]...) | ||
| failureCases = append(failureCases, copy) | ||
| } | ||
| } | ||
| return failureCases | ||
| } | ||
|
|
||
| // TestGVisorInDocker runs `runsc` inside a non-gVisor container. | ||
| // This is used in contexts such as Dangerzone: | ||
| // https://gvisor.dev/blog/2024/09/23/safe-ride-into-the-dangerzone/ | ||
| func TestGVisorInDocker(t *testing.T) { | ||
| ctx := context.Background() | ||
| runscPath, err := dockerutil.RuntimePath() | ||
| if err != nil { | ||
| t.Fatalf("Cannot locate runtime path: %v", err) | ||
| } | ||
| for _, test := range []testVariant{ | ||
| { | ||
| Name: "Rootful", | ||
| User: "root", | ||
| CapAdd: []string{ | ||
| // Necessary to set up networking (creating veth devices). | ||
| "NET_ADMIN", | ||
| // Necessary to set up networking, which calls `ip netns add` which | ||
| // calls `mount(2)`. | ||
| "SYS_ADMIN", | ||
| }, | ||
| // Mount cgroupfs as writable, otherwise the runtime won't be able to | ||
| // set up cgroups. | ||
| MountCgroupfs: true, | ||
| }, | ||
| { | ||
| Name: "Rootful without networking", | ||
| User: "root", | ||
| CapAdd: []string{ | ||
| // "Can't run sandbox process in minimal chroot since we don't have CAP_SYS_ADMIN" | ||
| "SYS_ADMIN", | ||
| }, | ||
| Args: []string{ | ||
| "--network=none", | ||
| }, | ||
| MountCgroupfs: true, | ||
| }, | ||
| { | ||
| Name: "Rootful with host networking", | ||
| User: "root", | ||
| CapAdd: []string{ | ||
| // Necessary to set up networking (creating veth devices). | ||
| "NET_ADMIN", | ||
| // Necessary to set up networking, which calls `ip netns add` which | ||
| // calls `mount(2)`. | ||
| "SYS_ADMIN", | ||
| }, | ||
| Args: []string{ | ||
| "--network=host", | ||
| }, | ||
| MountCgroupfs: true, | ||
| }, | ||
| { | ||
| Name: "Rootful without networking and cgroupfs", | ||
| User: "root", | ||
| CapAdd: []string{ | ||
| // "Can't run sandbox process in minimal chroot since we don't have CAP_SYS_ADMIN" | ||
| "SYS_ADMIN", | ||
| }, | ||
| Args: []string{ | ||
| "--network=none", | ||
| "--ignore-cgroups=true", | ||
| }, | ||
| }, | ||
| { | ||
| Name: "Rootless", | ||
| User: "nonroot", | ||
| WorkDir: "/home/nonroot", | ||
| Args: []string{ | ||
| "--rootless=true", | ||
| }, | ||
| }, | ||
| { | ||
| Name: "Rootless without networking", | ||
| User: "nonroot", | ||
| WorkDir: "/home/nonroot", | ||
| Args: []string{ | ||
| "--rootless=true", | ||
| "--network=none", | ||
| }, | ||
| }, | ||
| } { | ||
| t.Run(test.Name, func(t *testing.T) { | ||
| if logs, err := test.run(ctx, t, runscPath); err != nil { | ||
| t.Fatalf("Error: %v; logs:\n%s", err, logs) | ||
| } | ||
| for _, failureCase := range test.failureCases() { | ||
| t.Run(failureCase.Name, func(t *testing.T) { | ||
| if logs, err := failureCase.run(ctx, t, runscPath); err == nil { | ||
| t.Fatalf("Failure case unexpectedly succeeded; logs:\n%s", logs) | ||
| } | ||
| }) | ||
| } | ||
| }) | ||
| } | ||
| } |