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-rw-r--r--pkg/sentry/fs/gofer/cache_policy.go7
-rw-r--r--runsc/boot/config.go9
-rw-r--r--runsc/boot/fs.go62
-rw-r--r--runsc/boot/loader_test.go36
-rw-r--r--runsc/container/container_test.go207
-rw-r--r--runsc/main.go6
-rw-r--r--runsc/sandbox/sandbox.go8
-rw-r--r--runsc/test/testutil/testutil.go1
8 files changed, 261 insertions, 75 deletions
diff --git a/pkg/sentry/fs/gofer/cache_policy.go b/pkg/sentry/fs/gofer/cache_policy.go
index 52d97b54f..fa8abf51c 100644
--- a/pkg/sentry/fs/gofer/cache_policy.go
+++ b/pkg/sentry/fs/gofer/cache_policy.go
@@ -35,10 +35,9 @@ const (
// fs agent immediately.
cacheAllWritethrough
- // Use virtual file system cache for everything, but reload dirents
- // from the remote filesystem on each lookup. Thus, if the remote
- // filesystem has changed, the returned dirent will have the updated
- // state.
+ // Use the (host) page cache for reads/writes, but don't cache anything
+ // else. This allows the sandbox filesystem to stay in sync with any
+ // changes to the remote filesystem.
//
// This policy should *only* be used with remote filesystems that
// donate their host FDs to the sandbox and thus use the host page
diff --git a/runsc/boot/config.go b/runsc/boot/config.go
index 074cd6a63..6c69a7c38 100644
--- a/runsc/boot/config.go
+++ b/runsc/boot/config.go
@@ -64,6 +64,11 @@ const (
// requests and forwards them to the host.
FileAccessProxy FileAccessType = iota
+ // FileAccessProxyExclusive is the same as FileAccessProxy, but enables
+ // extra caching for improved performance. It should only be used if
+ // the sandbox has exclusive access to the filesystem.
+ FileAccessProxyExclusive
+
// FileAccessDirect connects the sandbox directly to the host filesystem.
FileAccessDirect
)
@@ -73,6 +78,8 @@ func MakeFileAccessType(s string) (FileAccessType, error) {
switch s {
case "proxy":
return FileAccessProxy, nil
+ case "proxy-exclusive":
+ return FileAccessProxyExclusive, nil
case "direct":
return FileAccessDirect, nil
default:
@@ -84,6 +91,8 @@ func (f FileAccessType) String() string {
switch f {
case FileAccessProxy:
return "proxy"
+ case FileAccessProxyExclusive:
+ return "proxy-exclusive"
case FileAccessDirect:
return "direct"
default:
diff --git a/runsc/boot/fs.go b/runsc/boot/fs.go
index e596c739f..eea2ec1f5 100644
--- a/runsc/boot/fs.go
+++ b/runsc/boot/fs.go
@@ -17,6 +17,7 @@ package boot
import (
"fmt"
"path/filepath"
+ "strconv"
"strings"
// Include filesystem types that OCI spec might mount.
@@ -54,6 +55,9 @@ type fdDispenser struct {
}
func (f *fdDispenser) remove() int {
+ if f.empty() {
+ panic("fdDispenser out of fds")
+ }
rv := f.fds[0]
f.fds = f.fds[1:]
return rv
@@ -160,8 +164,6 @@ func compileMounts(spec *specs.Spec) []specs.Mount {
// setMounts iterates over mounts and mounts them in the specified
// mount namespace.
func setMounts(ctx context.Context, conf *Config, mns *fs.MountNamespace, fds *fdDispenser, mounts []specs.Mount) error {
-
- // Mount all submounts from mounts.
for _, m := range mounts {
if err := mountSubmount(ctx, conf, mns, fds, m, mounts); err != nil {
return err
@@ -181,11 +183,12 @@ func createRootMount(ctx context.Context, spec *specs.Spec, conf *Config, fds *f
)
switch conf.FileAccess {
- case FileAccessProxy:
+ case FileAccessProxy, FileAccessProxyExclusive:
fd := fds.remove()
log.Infof("Mounting root over 9P, ioFD: %d", fd)
hostFS := mustFindFilesystem("9p")
- rootInode, err = hostFS.Mount(ctx, rootDevice, mf, fmt.Sprintf("trans=fd,rfdno=%d,wfdno=%d,privateunixsocket=true", fd, fd))
+ opts := p9MountOptions(conf, fd)
+ rootInode, err = hostFS.Mount(ctx, rootDevice, mf, strings.Join(opts, ","))
if err != nil {
return nil, fmt.Errorf("failed to generate root mount point: %v", err)
}
@@ -242,13 +245,16 @@ func addOverlay(ctx context.Context, conf *Config, lower *fs.Inode, name string,
return fs.NewOverlayRoot(ctx, upper, lower, lowerFlags)
}
-// getMountNameAndOptions retrieves the fsName, data, and useOverlay values
+// getMountNameAndOptions retrieves the fsName, opts, and useOverlay values
// used for mounts.
func getMountNameAndOptions(conf *Config, m specs.Mount, fds *fdDispenser) (string, []string, bool, error) {
- var fsName string
- var data []string
- var useOverlay bool
- var err error
+ var (
+ fsName string
+ opts []string
+ useOverlay bool
+ err error
+ )
+
switch m.Type {
case "devpts", "devtmpfs", "proc", "sysfs":
fsName = m.Type
@@ -258,17 +264,17 @@ func getMountNameAndOptions(conf *Config, m specs.Mount, fds *fdDispenser) (stri
fsName = m.Type
// tmpfs has some extra supported options that we must pass through.
- data, err = parseAndFilterOptions(m.Options, "mode", "uid", "gid")
+ opts, err = parseAndFilterOptions(m.Options, "mode", "uid", "gid")
case "bind":
switch conf.FileAccess {
- case FileAccessProxy:
+ case FileAccessProxy, FileAccessProxyExclusive:
fd := fds.remove()
fsName = "9p"
- data = []string{"trans=fd", fmt.Sprintf("rfdno=%d", fd), fmt.Sprintf("wfdno=%d", fd), "privateunixsocket=true"}
+ opts = p9MountOptions(conf, fd)
case FileAccessDirect:
fsName = "whitelistfs"
- data = []string{"root=" + m.Source, "dont_translate_ownership=true"}
+ opts = []string{"root=" + m.Source, "dont_translate_ownership=true"}
default:
err = fmt.Errorf("invalid file access type: %v", conf.FileAccess)
}
@@ -282,13 +288,13 @@ func getMountNameAndOptions(conf *Config, m specs.Mount, fds *fdDispenser) (stri
// we do not support.
log.Warningf("ignoring unknown filesystem type %q", m.Type)
}
- return fsName, data, useOverlay, err
+ return fsName, opts, useOverlay, err
}
func mountSubmount(ctx context.Context, conf *Config, mns *fs.MountNamespace, fds *fdDispenser, m specs.Mount, mounts []specs.Mount) error {
// Map mount type to filesystem name, and parse out the options that we are
// capable of dealing with.
- fsName, data, useOverlay, err := getMountNameAndOptions(conf, m, fds)
+ fsName, opts, useOverlay, err := getMountNameAndOptions(conf, m, fds)
// Return the error or nil that corresponds to the default case in getMountNameAndOptions.
if err != nil {
@@ -307,7 +313,7 @@ func mountSubmount(ctx context.Context, conf *Config, mns *fs.MountNamespace, fd
mf.ReadOnly = true
}
- inode, err := filesystem.Mount(ctx, mountDevice(m), mf, strings.Join(data, ","))
+ inode, err := filesystem.Mount(ctx, mountDevice(m), mf, strings.Join(opts, ","))
if err != nil {
return fmt.Errorf("failed to create mount with source %q: %v", m.Source, err)
}
@@ -387,6 +393,20 @@ func mkdirAll(ctx context.Context, mns *fs.MountNamespace, path string) error {
return nil
}
+// p9MountOptions creates a slice of options for a p9 mount.
+func p9MountOptions(conf *Config, fd int) []string {
+ opts := []string{
+ "trans=fd",
+ "rfdno=" + strconv.Itoa(fd),
+ "wfdno=" + strconv.Itoa(fd),
+ "privateunixsocket=true",
+ }
+ if conf.FileAccess == FileAccessProxy {
+ opts = append(opts, "cache=remote_revalidating")
+ }
+ return opts
+}
+
// parseAndFilterOptions parses a MountOptions slice and filters by the allowed
// keys.
func parseAndFilterOptions(opts []string, allowedKeys ...string) ([]string, error) {
@@ -436,8 +456,7 @@ func mountDevice(m specs.Mount) string {
// addRestoreMount adds a mount to the MountSources map used for restoring a
// checkpointed container.
func addRestoreMount(conf *Config, renv *fs.RestoreEnvironment, m specs.Mount, fds *fdDispenser) error {
- fsName, data, _, err := getMountNameAndOptions(conf, m, fds)
- dataString := strings.Join(data, ",")
+ fsName, opts, _, err := getMountNameAndOptions(conf, m, fds)
// Return the error or nil that corresponds to the default case in getMountNameAndOptions.
if err != nil {
@@ -452,7 +471,7 @@ func addRestoreMount(conf *Config, renv *fs.RestoreEnvironment, m specs.Mount, f
newMount := fs.MountArgs{
Dev: mountDevice(m),
Flags: mountFlags(m.Options),
- Data: dataString,
+ Data: strings.Join(opts, ","),
}
renv.MountSources[fsName] = append(renv.MountSources[fsName], newMount)
log.Infof("Added mount at %q: %+v", fsName, newMount)
@@ -473,7 +492,8 @@ func createRestoreEnvironment(spec *specs.Spec, conf *Config, fds *fdDispenser)
// Add root mount.
fd := fds.remove()
- dataString := strings.Join([]string{"trans=fd", fmt.Sprintf("rfdno=%d", fd), fmt.Sprintf("wfdno=%d", fd), "privateunixsocket=true"}, ",")
+ opts := p9MountOptions(conf, fd)
+
mf := fs.MountSourceFlags{}
if spec.Root.Readonly {
mf.ReadOnly = true
@@ -482,7 +502,7 @@ func createRestoreEnvironment(spec *specs.Spec, conf *Config, fds *fdDispenser)
rootMount := fs.MountArgs{
Dev: rootDevice,
Flags: mf,
- Data: dataString,
+ Data: strings.Join(opts, ","),
}
renv.MountSources[rootFsName] = append(renv.MountSources[rootFsName], rootMount)
diff --git a/runsc/boot/loader_test.go b/runsc/boot/loader_test.go
index 7ea2e1ee5..f2f690b5d 100644
--- a/runsc/boot/loader_test.go
+++ b/runsc/boot/loader_test.go
@@ -398,7 +398,7 @@ func TestRestoreEnvironment(t *testing.T) {
{
Dev: "9pfs-/",
Flags: fs.MountSourceFlags{ReadOnly: true},
- Data: "trans=fd,rfdno=0,wfdno=0,privateunixsocket=true",
+ Data: "trans=fd,rfdno=0,wfdno=0,privateunixsocket=true,cache=remote_revalidating",
},
},
"tmpfs": {
@@ -458,11 +458,11 @@ func TestRestoreEnvironment(t *testing.T) {
{
Dev: "9pfs-/",
Flags: fs.MountSourceFlags{ReadOnly: true},
- Data: "trans=fd,rfdno=0,wfdno=0,privateunixsocket=true",
+ Data: "trans=fd,rfdno=0,wfdno=0,privateunixsocket=true,cache=remote_revalidating",
},
{
Dev: "9pfs-/dev/fd-foo",
- Data: "trans=fd,rfdno=1,wfdno=1,privateunixsocket=true",
+ Data: "trans=fd,rfdno=1,wfdno=1,privateunixsocket=true,cache=remote_revalidating",
},
},
"tmpfs": {
@@ -522,7 +522,7 @@ func TestRestoreEnvironment(t *testing.T) {
{
Dev: "9pfs-/",
Flags: fs.MountSourceFlags{ReadOnly: true},
- Data: "trans=fd,rfdno=0,wfdno=0,privateunixsocket=true",
+ Data: "trans=fd,rfdno=0,wfdno=0,privateunixsocket=true,cache=remote_revalidating",
},
},
"tmpfs": {
@@ -606,21 +606,21 @@ func TestRestoreEnvironment(t *testing.T) {
errorExpected: true,
},
}
-
for _, tc := range testCases {
- fds := &fdDispenser{fds: tc.ioFDs}
-
- actualRenv, err := createRestoreEnvironment(tc.spec, tc.conf, fds)
- 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.Fatalf("expected an error, but no error occurred.")
+ t.Run(tc.name, func(t *testing.T) {
+ fds := &fdDispenser{fds: tc.ioFDs}
+ actualRenv, err := createRestoreEnvironment(tc.spec, tc.conf, fds)
+ 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)
+ }
}
- } else {
- if !reflect.DeepEqual(*actualRenv, tc.expectedRenv) {
- t.Fatalf("restore environments did not match for test:%s\ngot:%+v\nwant:%+v\n", tc.name, *actualRenv, tc.expectedRenv)
- }
- }
+ })
}
}
diff --git a/runsc/container/container_test.go b/runsc/container/container_test.go
index 11edcd615..33c53e189 100644
--- a/runsc/container/container_test.go
+++ b/runsc/container/container_test.go
@@ -227,33 +227,43 @@ func findUDSApp() (string, error) {
return matches[0], nil
}
-type configOptions int
+type configOption int
const (
- overlay configOptions = 1 << iota
+ overlay configOption = iota
kvm
+ nonExclusiveFS
)
-const all = overlay | kvm
+
+var all = []configOption{overlay, kvm, nonExclusiveFS}
// configs generates different configurations to run tests.
-func configs(opts configOptions) []*boot.Config {
- cs := []*boot.Config{testutil.TestConfig(), testutil.TestConfig()}
- return cs
+func configs(opts ...configOption) []*boot.Config {
+ // Always load the default config.
+ cs := []*boot.Config{testutil.TestConfig()}
- if opts&overlay != 0 {
+ for _, o := range opts {
c := testutil.TestConfig()
- c.Overlay = true
+ switch o {
+ case overlay:
+ c.Overlay = true
+ case kvm:
+ // TODO: KVM tests are flaky. Disable until fixed.
+ continue
+
+ // TODO: KVM doesn't work with --race.
+ if testutil.RaceEnabled {
+ continue
+ }
+ c.Platform = boot.PlatformKVM
+ case nonExclusiveFS:
+ c.FileAccess = boot.FileAccessProxy
+ default:
+ panic(fmt.Sprintf("unknown config option %v", o))
+
+ }
cs = append(cs, c)
}
-
- // TODO: KVM tests are flaky. Disable until fixed.
- // // TODO: KVM doesn't work with --race.
- // if !testutil.RaceEnabled && opts&kvm != 0 {
- // c := testutil.TestConfig()
- // c.Platform = boot.PlatformKVM
- // cs = append(cs, c)
- // }
-
return cs
}
@@ -261,7 +271,7 @@ func configs(opts configOptions) []*boot.Config {
// It verifies after each step that the container can be loaded from disk, and
// has the correct status.
func TestLifecycle(t *testing.T) {
- for _, conf := range configs(all) {
+ for _, conf := range configs(all...) {
t.Logf("Running test with conf: %+v", conf)
// The container will just sleep for a long time. We will kill it before
// it finishes sleeping.
@@ -1049,10 +1059,11 @@ func TestPauseResumeStatus(t *testing.T) {
// - Running exec as non-root with CAP_DAC_OVERRIDE succeeds because it skips
// this check.
func TestCapabilities(t *testing.T) {
- const uid = 343
- const gid = 2401
+ // Pick uid/gid different than ours.
+ uid := auth.KUID(os.Getuid() + 1)
+ gid := auth.KGID(os.Getgid() + 1)
- for _, conf := range configs(all) {
+ for _, conf := range configs(all...) {
t.Logf("Running test with conf: %+v", conf)
spec := testutil.NewSpecWithArgs("sleep", "100")
@@ -1142,7 +1153,7 @@ func TestCapabilities(t *testing.T) {
// Test that an tty FD is sent over the console socket if one is provided.
func TestConsoleSocket(t *testing.T) {
- for _, conf := range configs(all) {
+ for _, conf := range configs(all...) {
t.Logf("Running test with conf: %+v", conf)
spec := testutil.NewSpecWithArgs("true")
rootDir, bundleDir, err := testutil.SetupContainer(spec, conf)
@@ -1303,8 +1314,6 @@ func TestReadonlyRoot(t *testing.T) {
defer os.RemoveAll(rootDir)
defer os.RemoveAll(bundleDir)
- conf.Overlay = true
-
// Create, start and wait for the container.
s, err := container.Create(testutil.UniqueContainerID(), spec, conf, bundleDir, "", "")
if err != nil {
@@ -1348,8 +1357,6 @@ func TestReadonlyMount(t *testing.T) {
defer os.RemoveAll(rootDir)
defer os.RemoveAll(bundleDir)
- conf.Overlay = true
-
// Create, start and wait for the container.
s, err := container.Create(testutil.UniqueContainerID(), spec, conf, bundleDir, "", "")
if err != nil {
@@ -1430,7 +1437,7 @@ func TestAbbreviatedIDs(t *testing.T) {
// TestMultiContainerSanity checks that it is possible to run 2 dead-simple
// containers in the same sandbox.
func TestMultiContainerSanity(t *testing.T) {
- for _, conf := range configs(all) {
+ for _, conf := range configs(all...) {
t.Logf("Running test with conf: %+v", conf)
containerIDs := []string{
@@ -1619,3 +1626,149 @@ func TestMultiContainerWait(t *testing.T) {
wg.Wait()
}
+
+// Check that modifications to a volume mount are propigated into and out of
+// the sandbox.
+func TestContainerVolumeContentsShared(t *testing.T) {
+ // Only run this test with shared proxy, since that is the only
+ // behavior it is testing.
+ conf := testutil.TestConfig()
+ conf.FileAccess = boot.FileAccessProxy
+ t.Logf("Running test with conf: %+v", conf)
+
+ // Main process just sleeps. We will use "exec" to probe the state of
+ // the filesystem.
+ spec := testutil.NewSpecWithArgs("sleep", "1000")
+
+ // Mount host temp dir inside the sandbox at '/tmp2'.
+ hostTmpDir, err := ioutil.TempDir("", "root-fs-test")
+ sandboxTmpDir := "/tmp2"
+ if err != nil {
+ t.Fatalf("TempDir failed: %v", err)
+ }
+ spec.Mounts = append(spec.Mounts, specs.Mount{
+ Type: "bind",
+ Destination: sandboxTmpDir,
+ Source: hostTmpDir,
+ })
+
+ rootDir, bundleDir, err := testutil.SetupContainer(spec, conf)
+ if err != nil {
+ t.Fatalf("error setting up container: %v", err)
+ }
+ defer os.RemoveAll(rootDir)
+ defer os.RemoveAll(bundleDir)
+
+ // Create and start the container.
+ c, err := container.Create(testutil.UniqueContainerID(), spec, conf, bundleDir, "", "")
+ if err != nil {
+ t.Fatalf("error creating container: %v", err)
+ }
+ defer c.Destroy()
+ if err := c.Start(conf); err != nil {
+ t.Fatalf("error starting container: %v", err)
+ }
+
+ // File that will be used to check consistency inside/outside sandbox.
+ hostFilename := filepath.Join(hostTmpDir, "file")
+ sandboxFilename := filepath.Join(sandboxTmpDir, "file")
+
+ // File does not exist yet. Reading from the sandbox should fail.
+ execArgsTestFile := control.ExecArgs{
+ Filename: "/usr/bin/test",
+ Argv: []string{"test", "-f", sandboxFilename},
+ }
+ if ws, err := c.Execute(&execArgsTestFile); err != nil {
+ t.Fatalf("unexpected error testing file %q: %v", sandboxFilename, err)
+ } else if ws.ExitStatus() == 0 {
+ t.Errorf("test %q exited with code %v, wanted not zero", ws.ExitStatus(), err)
+ }
+
+ // Create the file from outside of the sandbox.
+ if err := ioutil.WriteFile(hostFilename, []byte("foobar"), 0777); err != nil {
+ t.Fatalf("error writing to file %q: %v", hostFilename, err)
+ }
+
+ // Now we should be able to test the file from within the sandbox.
+ if ws, err := c.Execute(&execArgsTestFile); err != nil {
+ t.Fatalf("unexpected error testing file %q: %v", sandboxFilename, err)
+ } else if ws.ExitStatus() != 0 {
+ t.Errorf("test %q exited with code %v, wanted zero", sandboxFilename, ws.ExitStatus())
+ }
+
+ // Rename the file from outside of the sandbox.
+ newHostFilename := filepath.Join(hostTmpDir, "newfile")
+ newSandboxFilename := filepath.Join(sandboxTmpDir, "newfile")
+ if err := os.Rename(hostFilename, newHostFilename); err != nil {
+ t.Fatalf("os.Rename(%q, %q) failed: %v", hostFilename, newHostFilename, err)
+ }
+
+ // File should no longer exist at the old path within the sandbox.
+ if ws, err := c.Execute(&execArgsTestFile); err != nil {
+ t.Fatalf("unexpected error testing file %q: %v", sandboxFilename, err)
+ } else if ws.ExitStatus() == 0 {
+ t.Errorf("test %q exited with code %v, wanted not zero", sandboxFilename, ws.ExitStatus())
+ }
+
+ // We should be able to test the new filename from within the sandbox.
+ execArgsTestNewFile := control.ExecArgs{
+ Filename: "/usr/bin/test",
+ Argv: []string{"test", "-f", newSandboxFilename},
+ }
+ if ws, err := c.Execute(&execArgsTestNewFile); err != nil {
+ t.Fatalf("unexpected error testing file %q: %v", newSandboxFilename, err)
+ } else if ws.ExitStatus() != 0 {
+ t.Errorf("test %q exited with code %v, wanted zero", newSandboxFilename, ws.ExitStatus())
+ }
+
+ // Delete the renamed file from outside of the sandbox.
+ if err := os.Remove(newHostFilename); err != nil {
+ t.Fatalf("error removing file %q: %v", hostFilename, err)
+ }
+
+ // Renamed file should no longer exist at the old path within the sandbox.
+ if ws, err := c.Execute(&execArgsTestNewFile); err != nil {
+ t.Fatalf("unexpected error testing file %q: %v", newSandboxFilename, err)
+ } else if ws.ExitStatus() == 0 {
+ t.Errorf("test %q exited with code %v, wanted not zero", newSandboxFilename, ws.ExitStatus())
+ }
+
+ // Now create the file from WITHIN the sandbox.
+ execArgsTouch := control.ExecArgs{
+ Filename: "/usr/bin/touch",
+ Argv: []string{"touch", sandboxFilename},
+ KUID: auth.KUID(os.Getuid()),
+ KGID: auth.KGID(os.Getgid()),
+ }
+ if ws, err := c.Execute(&execArgsTouch); err != nil {
+ t.Fatalf("unexpected error touching file %q: %v", sandboxFilename, err)
+ } else if ws.ExitStatus() != 0 {
+ t.Errorf("touch %q exited with code %v, wanted zero", sandboxFilename, ws.ExitStatus())
+ }
+
+ // File should exist outside the sandbox.
+ if _, err := os.Stat(hostFilename); err != nil {
+ t.Errorf("stat %q got error %v, wanted nil", hostFilename, err)
+ }
+
+ // File should exist outside the sandbox.
+ if _, err := os.Stat(hostFilename); err != nil {
+ t.Errorf("stat %q got error %v, wanted nil", hostFilename, err)
+ }
+
+ // Delete the file from within the sandbox.
+ execArgsRemove := control.ExecArgs{
+ Filename: "/bin/rm",
+ Argv: []string{"rm", sandboxFilename},
+ }
+ if ws, err := c.Execute(&execArgsRemove); err != nil {
+ t.Fatalf("unexpected error removing file %q: %v", sandboxFilename, err)
+ } else if ws.ExitStatus() != 0 {
+ t.Errorf("remove %q exited with code %v, wanted zero", sandboxFilename, ws.ExitStatus())
+ }
+
+ // File should not exist outside the sandbox.
+ if _, err := os.Stat(hostFilename); !os.IsNotExist(err) {
+ t.Errorf("stat %q got error %v, wanted ErrNotExist", hostFilename, err)
+ }
+}
diff --git a/runsc/main.go b/runsc/main.go
index 10ae44b5e..b36100cca 100644
--- a/runsc/main.go
+++ b/runsc/main.go
@@ -57,7 +57,7 @@ var (
// Flags that control sandbox runtime behavior.
platform = flag.String("platform", "ptrace", "specifies which platform to use: ptrace (default), kvm")
network = flag.String("network", "sandbox", "specifies which network to use: sandbox (default), host, none. Using network inside the sandbox is more secure because it's isolated from the host network.")
- fileAccess = flag.String("file-access", "proxy", "specifies which filesystem to use: proxy (default), direct. Using a proxy is more secure because it disallows the sandbox from opennig files directly in the host.")
+ fileAccess = flag.String("file-access", "proxy-exclusive", "specifies which filesystem to use: proxy-exclusive (default), proxy-shared, or direct. Using a proxy is more secure because it disallows the sandbox from opening files directly in the host. Setting 'proxy-shared' will disable caches and should be used if external modifications to the filesystem are expected.")
overlay = flag.Bool("overlay", false, "wrap filesystem mounts with writable overlay. All modifications are stored in memory inside the sandbox.")
multiContainer = flag.Bool("multi-container", false, "enable *experimental* multi-container support.")
watchdogAction = flag.String("watchdog-action", "log", "sets what action the watchdog takes when triggered: log (default), panic.")
@@ -119,6 +119,10 @@ func main() {
cmd.Fatalf("%v", err)
}
+ if *fileAccess == "proxy" && *overlay {
+ cmd.Fatalf("overlay flag is incompatible with file-access=proxy")
+ }
+
// Create a new Config from the flags.
conf := &boot.Config{
RootDir: *rootDir,
diff --git a/runsc/sandbox/sandbox.go b/runsc/sandbox/sandbox.go
index 196949f11..2b043d412 100644
--- a/runsc/sandbox/sandbox.go
+++ b/runsc/sandbox/sandbox.go
@@ -233,7 +233,7 @@ func (s *Sandbox) connError(err error) error {
}
func (s *Sandbox) createGoferProcess(spec *specs.Spec, conf *boot.Config, bundleDir, binPath string) ([]*os.File, error) {
- if conf.FileAccess != boot.FileAccessProxy {
+ if conf.FileAccess == boot.FileAccessDirect {
// Don't start a gofer. The sandbox will access host FS directly.
return nil, nil
}
@@ -369,11 +369,11 @@ func (s *Sandbox) createSandboxProcess(spec *specs.Spec, conf *boot.Config, bund
nss = append(nss, specs.LinuxNamespace{Type: specs.PIDNamespace})
}
- if conf.FileAccess == boot.FileAccessProxy {
+ if conf.FileAccess == boot.FileAccessDirect {
+ log.Infof("Sandbox will be started in the current mount namespace")
+ } else {
log.Infof("Sandbox will be started in new mount namespace")
nss = append(nss, specs.LinuxNamespace{Type: specs.MountNamespace})
- } else {
- log.Infof("Sandbox will be started in the current mount namespace")
}
// Joins the network namespace if network is enabled. the sandbox talks
diff --git a/runsc/test/testutil/testutil.go b/runsc/test/testutil/testutil.go
index 4e7ab3760..d2b39b58c 100644
--- a/runsc/test/testutil/testutil.go
+++ b/runsc/test/testutil/testutil.go
@@ -81,6 +81,7 @@ func TestConfig() *boot.Config {
Network: boot.NetworkNone,
Strace: true,
MultiContainer: true,
+ FileAccess: boot.FileAccessProxyExclusive,
}
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-13 08:18:13 +0000