Automated rollback of changelist 213307171

PiperOrigin-RevId: 213504354
Change-Id: Iadd42f0ca4b7e7a9eae780bee9900c7233fb4f3f

5 files changed, 25 insertions, 39 deletions

diff --git a/runsc/boot/controller.go b/runsc/boot/controller.go
index dc9359092..f5b0d371c 100644
--- a/runsc/boot/controller.go
+++ b/runsc/boot/controller.go
@@ -186,10 +186,8 @@ type StartArgs struct {
 	// CID is the ID of the container to start.
 	CID string
 
-	// FilePayload contains, in order:
-	//   * stdin, stdout, and stderr.
-	//   * the file descriptor over which the sandbox will
-	//     request files from its root filesystem.
+	// FilePayload contains the file descriptor over which the sandbox will
+	// request files from its root filesystem.
 	urpc.FilePayload
 }
 
@@ -217,8 +215,8 @@ func (cm *containerManager) Start(args *StartArgs, _ *struct{}) error {
 	if path.Clean(args.CID) != args.CID {
 		return fmt.Errorf("container ID shouldn't contain directory traversals such as \"..\": %q", args.CID)
 	}
-	if len(args.FilePayload.Files) < 4 {
-		return fmt.Errorf("start arguments must contain stdin, stderr, and stdout followed by at least one file for the container root gofer")
+	if len(args.FilePayload.Files) == 0 {
+		return fmt.Errorf("start arguments must contain at least one file for the container root")
 	}
 
 	err := cm.l.startContainer(cm.l.k, args.Spec, args.Conf, args.CID, args.FilePayload.Files)
@@ -320,7 +318,7 @@ func (cm *containerManager) Restore(o *RestoreOpts, _ *struct{}) error {
 	cm.l.k = k
 
 	// Set up the restore environment.
-	fds := &fdDispenser{fds: cm.l.goferFDs}
+	fds := &fdDispenser{fds: cm.l.ioFDs}
 	renv, err := createRestoreEnvironment(cm.l.spec, cm.l.conf, fds)
 	if err != nil {
 		return fmt.Errorf("error creating RestoreEnvironment: %v", err)
diff --git a/runsc/boot/fds.go b/runsc/boot/fds.go
index 91c698fea..9de5a78b1 100644
--- a/runsc/boot/fds.go
+++ b/runsc/boot/fds.go
@@ -16,6 +16,7 @@ package boot
 
 import (
 	"fmt"
+	"syscall"
 
 	"gvisor.googlesource.com/gvisor/pkg/sentry/context"
 	"gvisor.googlesource.com/gvisor/pkg/sentry/fs"
@@ -27,19 +28,15 @@ import (
 
 // createFDMap creates an fd map that contains stdin, stdout, and stderr. If
 // console is true, then ioctl calls will be passed through to the host fd.
-func createFDMap(ctx context.Context, k *kernel.Kernel, l *limits.LimitSet, console bool, stdioFDs []int) (*kernel.FDMap, error) {
-	if len(stdioFDs) != 3 {
-		return nil, fmt.Errorf("stdioFDs should contain exactly 3 FDs (stdin, stdout, and stderr), but %d FDs received", len(stdioFDs))
-	}
-
+func createFDMap(ctx context.Context, k *kernel.Kernel, l *limits.LimitSet, console bool) (*kernel.FDMap, error) {
 	fdm := k.NewFDMap()
 	defer fdm.DecRef()
 
 	// Maps sandbox fd to host fd.
 	fdMap := map[int]int{
-		0: stdioFDs[0],
-		1: stdioFDs[1],
-		2: stdioFDs[2],
+		0: syscall.Stdin,
+		1: syscall.Stdout,
+		2: syscall.Stderr,
 	}
 	mounter := fs.FileOwnerFromContext(ctx)
 
diff --git a/runsc/boot/fs.go b/runsc/boot/fs.go
index 45843fe7b..5ec9a7d03 100644
--- a/runsc/boot/fs.go
+++ b/runsc/boot/fs.go
@@ -82,7 +82,7 @@ func (f *fdDispenser) empty() bool {
 
 // createMountNamespace creates a mount namespace containing the root filesystem
 // and all mounts. 'rootCtx' is used to walk directories to find mount points.
-func createMountNamespace(userCtx context.Context, rootCtx context.Context, spec *specs.Spec, conf *Config, goferFDs []int) (*fs.MountNamespace, error) {
+func createMountNamespace(userCtx context.Context, rootCtx context.Context, spec *specs.Spec, conf *Config, ioFDs []int) (*fs.MountNamespace, error) {
 	mounts := compileMounts(spec)
 	// Create a tmpfs mount where we create and mount a root filesystem for
 	// each child container.
@@ -90,7 +90,7 @@ func createMountNamespace(userCtx context.Context, rootCtx context.Context, spec
 		Type:        tmpfs,
 		Destination: childContainersDir,
 	})
-	fds := &fdDispenser{fds: goferFDs}
+	fds := &fdDispenser{fds: ioFDs}
 	rootInode, err := createRootMount(rootCtx, spec, conf, fds, mounts)
 	if err != nil {
 		return nil, fmt.Errorf("failed to create root mount: %v", err)
@@ -595,13 +595,13 @@ func subtargets(root string, mnts []specs.Mount) []string {
 
 // setFileSystemForProcess is used to set up the file system and amend the procArgs accordingly.
 // procArgs are passed by reference and the FDMap field is modified.
-func setFileSystemForProcess(procArgs *kernel.CreateProcessArgs, spec *specs.Spec, conf *Config, stdioFDs, goferFDs []int, console bool, creds *auth.Credentials, ls *limits.LimitSet, k *kernel.Kernel, cid string) error {
+func setFileSystemForProcess(procArgs *kernel.CreateProcessArgs, spec *specs.Spec, conf *Config, ioFDs []int, console bool, creds *auth.Credentials, ls *limits.LimitSet, k *kernel.Kernel, cid string) error {
 	ctx := procArgs.NewContext(k)
 
 	// Create the FD map, which will set stdin, stdout, and stderr.  If
 	// console is true, then ioctl calls will be passed through to the host
 	// fd.
-	fdm, err := createFDMap(ctx, k, ls, console, stdioFDs)
+	fdm, err := createFDMap(ctx, k, ls, console)
 	if err != nil {
 		return fmt.Errorf("error importing fds: %v", err)
 	}
@@ -625,7 +625,7 @@ func setFileSystemForProcess(procArgs *kernel.CreateProcessArgs, spec *specs.Spe
 	mns := k.RootMountNamespace()
 	if mns == nil {
 		// Create the virtual filesystem.
-		mns, err := createMountNamespace(ctx, rootCtx, spec, conf, goferFDs)
+		mns, err := createMountNamespace(ctx, rootCtx, spec, conf, ioFDs)
 		if err != nil {
 			return fmt.Errorf("error creating mounts: %v", err)
 		}
@@ -637,7 +637,7 @@ func setFileSystemForProcess(procArgs *kernel.CreateProcessArgs, spec *specs.Spe
 
 	// Create the container's root filesystem mount.
 	log.Infof("Creating new process in child container.")
-	fds := &fdDispenser{fds: append([]int{}, goferFDs...)}
+	fds := &fdDispenser{fds: append([]int{}, ioFDs...)}
 	rootInode, err := createRootMount(rootCtx, spec, conf, fds, nil)
 	if err != nil {
 		return fmt.Errorf("error creating filesystem for container: %v", err)
diff --git a/runsc/boot/loader.go b/runsc/boot/loader.go
index faaf3e800..623d04171 100644
--- a/runsc/boot/loader.go
+++ b/runsc/boot/loader.go
@@ -79,11 +79,8 @@ type Loader struct {
 
 	watchdog *watchdog.Watchdog
 
-	// stdioFDs contains stdin, stdout, and stderr.
-	stdioFDs []int
-
-	// goferFDs are the FDs that attach the sandbox to the gofers.
-	goferFDs []int
+	// ioFDs are the FDs that attach the sandbox to the gofers.
+	ioFDs []int
 
 	// spec is the base configuration for the root container.
 	spec *specs.Spec
@@ -143,7 +140,7 @@ func init() {
 
 // New initializes a new kernel loader configured by spec.
 // New also handles setting up a kernel for restoring a container.
-func New(spec *specs.Spec, conf *Config, controllerFD, deviceFD int, goferFDs []int, console bool) (*Loader, error) {
+func New(spec *specs.Spec, conf *Config, controllerFD, deviceFD int, ioFDs []int, console bool) (*Loader, error) {
 	if err := usage.Init(); err != nil {
 		return nil, fmt.Errorf("Error setting up memory usage: %v", err)
 	}
@@ -277,8 +274,7 @@ func New(spec *specs.Spec, conf *Config, controllerFD, deviceFD int, goferFDs []
 		conf:                  conf,
 		console:               console,
 		watchdog:              watchdog,
-		stdioFDs:              []int{syscall.Stdin, syscall.Stdout, syscall.Stderr},
-		goferFDs:              goferFDs,
+		ioFDs:                 ioFDs,
 		spec:                  spec,
 		startSignalForwarding: startSignalForwarding,
 		rootProcArgs:          procArgs,
@@ -390,8 +386,7 @@ func (l *Loader) run() error {
 			&l.rootProcArgs,
 			l.spec,
 			l.conf,
-			l.stdioFDs,
-			l.goferFDs,
+			l.ioFDs,
 			l.console,
 			l.rootProcArgs.Credentials,
 			l.rootProcArgs.Limits,
@@ -479,8 +474,7 @@ func (l *Loader) startContainer(k *kernel.Kernel, spec *specs.Spec, conf *Config
 		&procArgs,
 		spec,
 		conf,
-		ioFDs[:3], // stdioFDs
-		ioFDs[3:], // goferFDs
+		ioFDs,
 		false,
 		creds,
 		procArgs.Limits,
diff --git a/runsc/sandbox/sandbox.go b/runsc/sandbox/sandbox.go
index 3b10fd20e..21625a7c6 100644
--- a/runsc/sandbox/sandbox.go
+++ b/runsc/sandbox/sandbox.go
@@ -100,8 +100,8 @@ func (s *Sandbox) StartRoot(spec *specs.Spec, conf *boot.Config) error {
 }
 
 // Start starts running a non-root container inside the sandbox.
-func (s *Sandbox) Start(spec *specs.Spec, conf *boot.Config, cid string, goferFiles []*os.File) error {
-	for _, f := range goferFiles {
+func (s *Sandbox) Start(spec *specs.Spec, conf *boot.Config, cid string, ioFiles []*os.File) error {
+	for _, f := range ioFiles {
 		defer f.Close()
 	}
 
@@ -112,15 +112,12 @@ func (s *Sandbox) Start(spec *specs.Spec, conf *boot.Config, cid string, goferFi
 	}
 	defer sandboxConn.Close()
 
-	// The payload must container stdin/stdout/stderr followed by gofer
-	// files.
-	files := append([]*os.File{os.Stdin, os.Stdout, os.Stderr}, goferFiles...)
 	// Start running the container.
 	args := boot.StartArgs{
 		Spec:        spec,
 		Conf:        conf,
 		CID:         cid,
-		FilePayload: urpc.FilePayload{Files: files},
+		FilePayload: urpc.FilePayload{Files: ioFiles},
 	}
 	if err := sandboxConn.Call(boot.ContainerStart, &args, nil); err != nil {
 		return fmt.Errorf("error starting non-root container %v: %v", spec.Process.Args, err)