Derek McGowan
243
core/mount/mount_idmapped_linux_test.go
Normal file
243
core/mount/mount_idmapped_linux_test.go
Normal file
@@ -0,0 +1,243 @@
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/*
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Copyright The containerd Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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 mount
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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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"syscall"
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"testing"
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kernel "github.com/containerd/containerd/v2/contrib/seccomp/kernelversion"
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"github.com/containerd/continuity/testutil"
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"github.com/stretchr/testify/require"
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"golang.org/x/sys/unix"
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)
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var (
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testUIDMaps = []syscall.SysProcIDMap{
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{ContainerID: 1000, HostID: 0, Size: 100},
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{ContainerID: 5000, HostID: 2000, Size: 100},
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{ContainerID: 10000, HostID: 3000, Size: 100},
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}
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testGIDMaps = []syscall.SysProcIDMap{
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{ContainerID: 1000, HostID: 0, Size: 100},
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{ContainerID: 5000, HostID: 2000, Size: 100},
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{ContainerID: 10000, HostID: 3000, Size: 100},
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}
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)
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func TestGetUsernsFD(t *testing.T) {
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testutil.RequiresRoot(t)
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k512 := kernel.KernelVersion{Kernel: 5, Major: 12}
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ok, err := kernel.GreaterEqualThan(k512)
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require.NoError(t, err)
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if !ok {
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t.Skip("GetUsernsFD requires kernel >= 5.12")
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}
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t.Run("basic", testGetUsernsFDBasic)
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t.Run("when kill child process before write u[g]id maps", testGetUsernsFDKillChildWhenWriteUGIDMaps)
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t.Run("when kill child process after open u[g]id_map file", testGetUsernsFDKillChildAfterOpenUGIDMapFiles)
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}
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func testGetUsernsFDBasic(t *testing.T) {
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for idx, tc := range []struct {
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uidMaps string
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gidMaps string
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hasErr bool
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}{
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{
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uidMaps: "0:1000:100",
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gidMaps: "0:1000:100",
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hasErr: false,
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},
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{
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uidMaps: "100:1000:100",
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gidMaps: "0:-1:100",
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hasErr: true,
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},
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{
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uidMaps: "100:1000:100",
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gidMaps: "-1:1000:100",
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hasErr: true,
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},
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{
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uidMaps: "100:1000:100",
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gidMaps: "0:1000:-1",
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hasErr: true,
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},
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} {
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t.Run(fmt.Sprintf("#%v", idx), func(t *testing.T) {
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_, err := GetUsernsFD(tc.uidMaps, tc.gidMaps)
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if tc.hasErr {
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require.Error(t, err)
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} else {
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require.NoError(t, err)
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}
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})
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}
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}
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func testGetUsernsFDKillChildWhenWriteUGIDMaps(t *testing.T) {
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hookFunc := func(reap bool) func(uintptr, *os.File) {
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return func(_pid uintptr, pidFD *os.File) {
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err := unix.PidfdSendSignal(int(pidFD.Fd()), unix.SIGKILL, nil, 0)
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require.NoError(t, err)
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if reap {
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pidfdWaitid(pidFD)
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}
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}
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}
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for _, tcReap := range []bool{true, false} {
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t.Run(fmt.Sprintf("#reap=%v", tcReap), func(t *testing.T) {
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updateTestHookKillForGetUsernsFD(t, nil, hookFunc(tcReap))
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usernsFD, err := getUsernsFD(testUIDMaps, testGIDMaps)
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require.NoError(t, err)
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defer usernsFD.Close()
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srcDir, checkFunc := initIDMappedChecker(t, testUIDMaps, testGIDMaps)
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destDir := t.TempDir()
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defer func() {
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require.NoError(t, UnmountAll(destDir, 0))
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}()
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err = IDMapMount(srcDir, destDir, int(usernsFD.Fd()))
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usernsFD.Close()
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require.NoError(t, err)
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checkFunc(destDir)
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})
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}
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}
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func testGetUsernsFDKillChildAfterOpenUGIDMapFiles(t *testing.T) {
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hookFunc := func(reap bool) func(uintptr, *os.File) {
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return func(_pid uintptr, pidFD *os.File) {
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err := unix.PidfdSendSignal(int(pidFD.Fd()), unix.SIGKILL, nil, 0)
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require.NoError(t, err)
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if reap {
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pidfdWaitid(pidFD)
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}
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}
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}
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for _, tc := range []struct {
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reap bool
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expected error
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}{
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{
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reap: false,
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expected: nil,
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},
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{
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reap: true,
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expected: syscall.ESRCH,
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},
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} {
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t.Run(fmt.Sprintf("#reap=%v", tc.reap), func(t *testing.T) {
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updateTestHookKillForGetUsernsFD(t, hookFunc(tc.reap), nil)
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usernsFD, err := getUsernsFD(testUIDMaps, testGIDMaps)
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if tc.expected != nil {
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require.Error(t, tc.expected, err)
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return
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}
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require.NoError(t, err)
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defer usernsFD.Close()
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srcDir, checkFunc := initIDMappedChecker(t, testUIDMaps, testGIDMaps)
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destDir := t.TempDir()
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defer func() {
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require.NoError(t, UnmountAll(destDir, 0))
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}()
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err = IDMapMount(srcDir, destDir, int(usernsFD.Fd()))
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usernsFD.Close()
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require.NoError(t, err)
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checkFunc(destDir)
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})
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}
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}
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func updateTestHookKillForGetUsernsFD(t *testing.T, newBeforeFunc, newAfterFunc func(uintptr, *os.File)) {
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testHookLock.Lock()
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oldBefore := testHookKillChildBeforePidfdSendSignal
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oldAfter := testHookKillChildAfterPidfdSendSignal
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t.Cleanup(func() {
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testHookKillChildBeforePidfdSendSignal = oldBefore
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testHookKillChildAfterPidfdSendSignal = oldAfter
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testHookLock.Unlock()
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})
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if newBeforeFunc != nil {
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testHookKillChildBeforePidfdSendSignal = newBeforeFunc
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}
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if newAfterFunc != nil {
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testHookKillChildAfterPidfdSendSignal = newAfterFunc
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}
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}
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func initIDMappedChecker(t *testing.T, uidMaps, gidMaps []syscall.SysProcIDMap) (_srcDir string, _verifyFunc func(destDir string)) {
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testutil.RequiresRoot(t)
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srcDir := t.TempDir()
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require.Equal(t, len(uidMaps), len(gidMaps))
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for idx := range uidMaps {
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file := filepath.Join(srcDir, fmt.Sprintf("%v", idx))
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f, err := os.Create(file)
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require.NoError(t, err, fmt.Sprintf("create file %s", file))
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defer f.Close()
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uid, gid := uidMaps[idx].ContainerID, gidMaps[idx].ContainerID
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err = f.Chown(uid, gid)
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require.NoError(t, err, fmt.Sprintf("chown %v:%v for file %s", uid, gid, file))
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}
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||||
return srcDir, func(destDir string) {
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||||
for idx := range uidMaps {
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||||
file := filepath.Join(destDir, fmt.Sprintf("%v", idx))
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||||
|
||||
f, err := os.Open(file)
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||||
require.NoError(t, err, fmt.Sprintf("open file %s", file))
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||||
defer f.Close()
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||||
|
||||
stat, err := f.Stat()
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||||
require.NoError(t, err, fmt.Sprintf("stat file %s", file))
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|
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sysStat := stat.Sys().(*syscall.Stat_t)
|
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|
||||
uid, gid := uidMaps[idx].HostID, gidMaps[idx].HostID
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require.Equal(t, uint32(uid), sysStat.Uid, fmt.Sprintf("check file %s uid", file))
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||||
require.Equal(t, uint32(gid), sysStat.Gid, fmt.Sprintf("check file %s gid", file))
|
||||
t.Logf("IDMapped File %s uid=%v, gid=%v", file, uid, gid)
|
||||
}
|
||||
}
|
||||
}
|
||||
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