Automated rollback of changelist 261387276

PiperOrigin-RevId: 266491264

5 files changed, 13 insertions, 113 deletions

diff --git a/pkg/sentry/fs/tty/BUILD b/pkg/sentry/fs/tty/BUILD
index 291164986..5e9327aec 100644
--- a/pkg/sentry/fs/tty/BUILD
+++ b/pkg/sentry/fs/tty/BUILD
@@ -23,7 +23,6 @@ go_library(
         "//pkg/sentry/device",
         "//pkg/sentry/fs",
         "//pkg/sentry/fs/fsutil",
-        "//pkg/sentry/kernel",
         "//pkg/sentry/kernel/auth",
         "//pkg/sentry/safemem",
         "//pkg/sentry/socket/unix/transport",
diff --git a/pkg/sentry/fs/tty/dir.go b/pkg/sentry/fs/tty/dir.go
index 2f639c823..1d128532b 100644
--- a/pkg/sentry/fs/tty/dir.go
+++ b/pkg/sentry/fs/tty/dir.go
@@ -129,9 +129,6 @@ func newDir(ctx context.Context, m *fs.MountSource) *fs.Inode {
 
 // Release implements fs.InodeOperations.Release.
 func (d *dirInodeOperations) Release(ctx context.Context) {
-	d.mu.Lock()
-	defer d.mu.Unlock()
-
 	d.master.DecRef()
 	if len(d.slaves) != 0 {
 		panic(fmt.Sprintf("devpts directory still contains active terminals: %+v", d))
diff --git a/pkg/sentry/fs/tty/master.go b/pkg/sentry/fs/tty/master.go
index 19b7557d5..92ec1ca18 100644
--- a/pkg/sentry/fs/tty/master.go
+++ b/pkg/sentry/fs/tty/master.go
@@ -172,19 +172,6 @@ func (mf *masterFileOperations) Ioctl(ctx context.Context, _ *fs.File, io userme
 		return 0, mf.t.ld.windowSize(ctx, io, args)
 	case linux.TIOCSWINSZ:
 		return 0, mf.t.ld.setWindowSize(ctx, io, args)
-	case linux.TIOCSCTTY:
-		// Make the given terminal the controlling terminal of the
-		// calling process.
-		return 0, mf.t.setControllingTTY(ctx, io, args, true /* isMaster */)
-	case linux.TIOCNOTTY:
-		// Release this process's controlling terminal.
-		return 0, mf.t.releaseControllingTTY(ctx, io, args, true /* isMaster */)
-	case linux.TIOCGPGRP:
-		// Get the foreground process group.
-		return mf.t.foregroundProcessGroup(ctx, io, args, true /* isMaster */)
-	case linux.TIOCSPGRP:
-		// Set the foreground process group.
-		return mf.t.setForegroundProcessGroup(ctx, io, args, true /* isMaster */)
 	default:
 		maybeEmitUnimplementedEvent(ctx, cmd)
 		return 0, syserror.ENOTTY
@@ -198,6 +185,8 @@ func maybeEmitUnimplementedEvent(ctx context.Context, cmd uint32) {
 		linux.TCSETS,
 		linux.TCSETSW,
 		linux.TCSETSF,
+		linux.TIOCGPGRP,
+		linux.TIOCSPGRP,
 		linux.TIOCGWINSZ,
 		linux.TIOCSWINSZ,
 		linux.TIOCSETD,
@@ -211,6 +200,8 @@ func maybeEmitUnimplementedEvent(ctx context.Context, cmd uint32) {
 		linux.TIOCEXCL,
 		linux.TIOCNXCL,
 		linux.TIOCGEXCL,
+		linux.TIOCNOTTY,
+		linux.TIOCSCTTY,
 		linux.TIOCGSID,
 		linux.TIOCGETD,
 		linux.TIOCVHANGUP,
diff --git a/pkg/sentry/fs/tty/slave.go b/pkg/sentry/fs/tty/slave.go
index 944c4ada1..e30266404 100644
--- a/pkg/sentry/fs/tty/slave.go
+++ b/pkg/sentry/fs/tty/slave.go
@@ -152,16 +152,9 @@ func (sf *slaveFileOperations) Ioctl(ctx context.Context, _ *fs.File, io usermem
 	case linux.TIOCSCTTY:
 		// Make the given terminal the controlling terminal of the
 		// calling process.
-		return 0, sf.si.t.setControllingTTY(ctx, io, args, false /* isMaster */)
-	case linux.TIOCNOTTY:
-		// Release this process's controlling terminal.
-		return 0, sf.si.t.releaseControllingTTY(ctx, io, args, false /* isMaster */)
-	case linux.TIOCGPGRP:
-		// Get the foreground process group.
-		return sf.si.t.foregroundProcessGroup(ctx, io, args, false /* isMaster */)
-	case linux.TIOCSPGRP:
-		// Set the foreground process group.
-		return sf.si.t.setForegroundProcessGroup(ctx, io, args, false /* isMaster */)
+		// TODO(b/129283598): Implement once we have support for job
+		// control.
+		return 0, nil
 	default:
 		maybeEmitUnimplementedEvent(ctx, cmd)
 		return 0, syserror.ENOTTY
diff --git a/pkg/sentry/fs/tty/terminal.go b/pkg/sentry/fs/tty/terminal.go
index ff8138820..b7cecb2ed 100644
--- a/pkg/sentry/fs/tty/terminal.go
+++ b/pkg/sentry/fs/tty/terminal.go
@@ -17,10 +17,7 @@ package tty
 import (
 	"gvisor.dev/gvisor/pkg/abi/linux"
 	"gvisor.dev/gvisor/pkg/refs"
-	"gvisor.dev/gvisor/pkg/sentry/arch"
 	"gvisor.dev/gvisor/pkg/sentry/context"
-	"gvisor.dev/gvisor/pkg/sentry/kernel"
-	"gvisor.dev/gvisor/pkg/sentry/usermem"
 )
 
 // Terminal is a pseudoterminal.
@@ -29,100 +26,23 @@ import (
 type Terminal struct {
 	refs.AtomicRefCount
 
-	// n is the terminal index. It is immutable.
+	// n is the terminal index.
 	n uint32
 
-	// d is the containing directory. It is immutable.
+	// d is the containing directory.
 	d *dirInodeOperations
 
-	// ld is the line discipline of the terminal. It is immutable.
+	// ld is the line discipline of the terminal.
 	ld *lineDiscipline
-
-	// masterKTTY contains the controlling process of the master end of
-	// this terminal. This field is immutable.
-	masterKTTY *kernel.TTY
-
-	// slaveKTTY contains the controlling process of the slave end of this
-	// terminal. This field is immutable.
-	slaveKTTY *kernel.TTY
 }
 
 func newTerminal(ctx context.Context, d *dirInodeOperations, n uint32) *Terminal {
 	termios := linux.DefaultSlaveTermios
 	t := Terminal{
-		d:          d,
-		n:          n,
-		ld:         newLineDiscipline(termios),
-		masterKTTY: &kernel.TTY{},
-		slaveKTTY:  &kernel.TTY{},
+		d:  d,
+		n:  n,
+		ld: newLineDiscipline(termios),
 	}
 	t.EnableLeakCheck("tty.Terminal")
 	return &t
 }
-
-// setControllingTTY makes tm the controlling terminal of the calling thread
-// group.
-func (tm *Terminal) setControllingTTY(ctx context.Context, io usermem.IO, args arch.SyscallArguments, isMaster bool) error {
-	task := kernel.TaskFromContext(ctx)
-	if task == nil {
-		panic("setControllingTTY must be called from a task context")
-	}
-
-	return task.ThreadGroup().SetControllingTTY(tm.tty(isMaster), args[2].Int())
-}
-
-// releaseControllingTTY removes tm as the controlling terminal of the calling
-// thread group.
-func (tm *Terminal) releaseControllingTTY(ctx context.Context, io usermem.IO, args arch.SyscallArguments, isMaster bool) error {
-	task := kernel.TaskFromContext(ctx)
-	if task == nil {
-		panic("releaseControllingTTY must be called from a task context")
-	}
-
-	return task.ThreadGroup().ReleaseControllingTTY(tm.tty(isMaster))
-}
-
-// foregroundProcessGroup gets the process group ID of tm's foreground process.
-func (tm *Terminal) foregroundProcessGroup(ctx context.Context, io usermem.IO, args arch.SyscallArguments, isMaster bool) (uintptr, error) {
-	task := kernel.TaskFromContext(ctx)
-	if task == nil {
-		panic("foregroundProcessGroup must be called from a task context")
-	}
-
-	ret, err := task.ThreadGroup().ForegroundProcessGroup(tm.tty(isMaster))
-	if err != nil {
-		return 0, err
-	}
-
-	// Write it out to *arg.
-	_, err = usermem.CopyObjectOut(ctx, io, args[2].Pointer(), int32(ret), usermem.IOOpts{
-		AddressSpaceActive: true,
-	})
-	return 0, err
-}
-
-// foregroundProcessGroup sets tm's foreground process.
-func (tm *Terminal) setForegroundProcessGroup(ctx context.Context, io usermem.IO, args arch.SyscallArguments, isMaster bool) (uintptr, error) {
-	task := kernel.TaskFromContext(ctx)
-	if task == nil {
-		panic("setForegroundProcessGroup must be called from a task context")
-	}
-
-	// Read in the process group ID.
-	var pgid int32
-	if _, err := usermem.CopyObjectIn(ctx, io, args[2].Pointer(), &pgid, usermem.IOOpts{
-		AddressSpaceActive: true,
-	}); err != nil {
-		return 0, err
-	}
-
-	ret, err := task.ThreadGroup().SetForegroundProcessGroup(tm.tty(isMaster), kernel.ProcessGroupID(pgid))
-	return uintptr(ret), err
-}
-
-func (tm *Terminal) tty(isMaster bool) *kernel.TTY {
-	if isMaster {
-		return tm.masterKTTY
-	}
-	return tm.slaveKTTY
-}