Merge release-20200818.0-100-g723fb5c11 (automated)

5 files changed, 68 insertions, 64 deletions

diff --git a/pkg/sentry/fs/tty/line_discipline.go b/pkg/sentry/fs/tty/line_discipline.go
index 2e9dd2d55..b6bc011a9 100644
--- a/pkg/sentry/fs/tty/line_discipline.go
+++ b/pkg/sentry/fs/tty/line_discipline.go
@@ -21,6 +21,7 @@ import (
 	"gvisor.dev/gvisor/pkg/abi/linux"
 	"gvisor.dev/gvisor/pkg/context"
 	"gvisor.dev/gvisor/pkg/sentry/arch"
+	"gvisor.dev/gvisor/pkg/sentry/kernel"
 	"gvisor.dev/gvisor/pkg/sync"
 	"gvisor.dev/gvisor/pkg/syserror"
 	"gvisor.dev/gvisor/pkg/usermem"
@@ -115,27 +116,23 @@ func newLineDiscipline(termios linux.KernelTermios) *lineDiscipline {
 }
 
 // getTermios gets the linux.Termios for the tty.
-func (l *lineDiscipline) getTermios(ctx context.Context, io usermem.IO, args arch.SyscallArguments) (uintptr, error) {
+func (l *lineDiscipline) getTermios(task *kernel.Task, args arch.SyscallArguments) (uintptr, error) {
 	l.termiosMu.RLock()
 	defer l.termiosMu.RUnlock()
 	// We must copy a Termios struct, not KernelTermios.
 	t := l.termios.ToTermios()
-	_, err := usermem.CopyObjectOut(ctx, io, args[2].Pointer(), t, usermem.IOOpts{
-		AddressSpaceActive: true,
-	})
+	_, err := t.CopyOut(task, args[2].Pointer())
 	return 0, err
 }
 
 // setTermios sets a linux.Termios for the tty.
-func (l *lineDiscipline) setTermios(ctx context.Context, io usermem.IO, args arch.SyscallArguments) (uintptr, error) {
+func (l *lineDiscipline) setTermios(task *kernel.Task, args arch.SyscallArguments) (uintptr, error) {
 	l.termiosMu.Lock()
 	defer l.termiosMu.Unlock()
 	oldCanonEnabled := l.termios.LEnabled(linux.ICANON)
 	// We must copy a Termios struct, not KernelTermios.
 	var t linux.Termios
-	_, err := usermem.CopyObjectIn(ctx, io, args[2].Pointer(), &t, usermem.IOOpts{
-		AddressSpaceActive: true,
-	})
+	_, err := t.CopyIn(task, args[2].Pointer())
 	l.termios.FromTermios(t)
 
 	// If canonical mode is turned off, move bytes from inQueue's wait
@@ -152,21 +149,17 @@ func (l *lineDiscipline) setTermios(ctx context.Context, io usermem.IO, args arc
 	return 0, err
 }
 
-func (l *lineDiscipline) windowSize(ctx context.Context, io usermem.IO, args arch.SyscallArguments) error {
+func (l *lineDiscipline) windowSize(t *kernel.Task, args arch.SyscallArguments) error {
 	l.sizeMu.Lock()
 	defer l.sizeMu.Unlock()
-	_, err := usermem.CopyObjectOut(ctx, io, args[2].Pointer(), l.size, usermem.IOOpts{
-		AddressSpaceActive: true,
-	})
+	_, err := l.size.CopyOut(t, args[2].Pointer())
 	return err
 }
 
-func (l *lineDiscipline) setWindowSize(ctx context.Context, io usermem.IO, args arch.SyscallArguments) error {
+func (l *lineDiscipline) setWindowSize(t *kernel.Task, args arch.SyscallArguments) error {
 	l.sizeMu.Lock()
 	defer l.sizeMu.Unlock()
-	_, err := usermem.CopyObjectIn(ctx, io, args[2].Pointer(), &l.size, usermem.IOOpts{
-		AddressSpaceActive: true,
-	})
+	_, err := l.size.CopyIn(t, args[2].Pointer())
 	return err
 }
 
@@ -182,8 +175,8 @@ func (l *lineDiscipline) slaveReadiness() waiter.EventMask {
 	return l.outQueue.writeReadiness(&l.termios) | l.inQueue.readReadiness(&l.termios)
 }
 
-func (l *lineDiscipline) inputQueueReadSize(ctx context.Context, io usermem.IO, args arch.SyscallArguments) error {
-	return l.inQueue.readableSize(ctx, io, args)
+func (l *lineDiscipline) inputQueueReadSize(t *kernel.Task, args arch.SyscallArguments) error {
+	return l.inQueue.readableSize(t, args)
 }
 
 func (l *lineDiscipline) inputQueueRead(ctx context.Context, dst usermem.IOSequence) (int64, error) {
@@ -217,8 +210,8 @@ func (l *lineDiscipline) inputQueueWrite(ctx context.Context, src usermem.IOSequ
 	return 0, syserror.ErrWouldBlock
 }
 
-func (l *lineDiscipline) outputQueueReadSize(ctx context.Context, io usermem.IO, args arch.SyscallArguments) error {
-	return l.outQueue.readableSize(ctx, io, args)
+func (l *lineDiscipline) outputQueueReadSize(t *kernel.Task, args arch.SyscallArguments) error {
+	return l.outQueue.readableSize(t, args)
 }
 
 func (l *lineDiscipline) outputQueueRead(ctx context.Context, dst usermem.IOSequence) (int64, error) {
diff --git a/pkg/sentry/fs/tty/master.go b/pkg/sentry/fs/tty/master.go
index e00746017..175457297 100644
--- a/pkg/sentry/fs/tty/master.go
+++ b/pkg/sentry/fs/tty/master.go
@@ -20,10 +20,12 @@ import (
 	"gvisor.dev/gvisor/pkg/sentry/arch"
 	"gvisor.dev/gvisor/pkg/sentry/fs"
 	"gvisor.dev/gvisor/pkg/sentry/fs/fsutil"
+	"gvisor.dev/gvisor/pkg/sentry/kernel"
 	"gvisor.dev/gvisor/pkg/sentry/unimpl"
 	"gvisor.dev/gvisor/pkg/syserror"
 	"gvisor.dev/gvisor/pkg/usermem"
 	"gvisor.dev/gvisor/pkg/waiter"
+	"gvisor.dev/gvisor/tools/go_marshal/primitive"
 )
 
 // LINT.IfChange
@@ -152,46 +154,51 @@ func (mf *masterFileOperations) Write(ctx context.Context, _ *fs.File, src userm
 
 // Ioctl implements fs.FileOperations.Ioctl.
 func (mf *masterFileOperations) Ioctl(ctx context.Context, _ *fs.File, io usermem.IO, args arch.SyscallArguments) (uintptr, error) {
+	t := kernel.TaskFromContext(ctx)
+	if t == nil {
+		// ioctl(2) may only be called from a task goroutine.
+		return 0, syserror.ENOTTY
+	}
+
 	switch cmd := args[1].Uint(); cmd {
 	case linux.FIONREAD: // linux.FIONREAD == linux.TIOCINQ
 		// Get the number of bytes in the output queue read buffer.
-		return 0, mf.t.ld.outputQueueReadSize(ctx, io, args)
+		return 0, mf.t.ld.outputQueueReadSize(t, args)
 	case linux.TCGETS:
 		// N.B. TCGETS on the master actually returns the configuration
 		// of the slave end.
-		return mf.t.ld.getTermios(ctx, io, args)
+		return mf.t.ld.getTermios(t, args)
 	case linux.TCSETS:
 		// N.B. TCSETS on the master actually affects the configuration
 		// of the slave end.
-		return mf.t.ld.setTermios(ctx, io, args)
+		return mf.t.ld.setTermios(t, args)
 	case linux.TCSETSW:
 		// TODO(b/29356795): This should drain the output queue first.
-		return mf.t.ld.setTermios(ctx, io, args)
+		return mf.t.ld.setTermios(t, args)
 	case linux.TIOCGPTN:
-		_, err := usermem.CopyObjectOut(ctx, io, args[2].Pointer(), uint32(mf.t.n), usermem.IOOpts{
-			AddressSpaceActive: true,
-		})
+		nP := primitive.Uint32(mf.t.n)
+		_, err := nP.CopyOut(t, args[2].Pointer())
 		return 0, err
 	case linux.TIOCSPTLCK:
 		// TODO(b/29356795): Implement pty locking. For now just pretend we do.
 		return 0, nil
 	case linux.TIOCGWINSZ:
-		return 0, mf.t.ld.windowSize(ctx, io, args)
+		return 0, mf.t.ld.windowSize(t, args)
 	case linux.TIOCSWINSZ:
-		return 0, mf.t.ld.setWindowSize(ctx, io, args)
+		return 0, mf.t.ld.setWindowSize(t, 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 */)
+		return 0, mf.t.setControllingTTY(ctx, args, true /* isMaster */)
 	case linux.TIOCNOTTY:
 		// Release this process's controlling terminal.
-		return 0, mf.t.releaseControllingTTY(ctx, io, args, true /* isMaster */)
+		return 0, mf.t.releaseControllingTTY(ctx, args, true /* isMaster */)
 	case linux.TIOCGPGRP:
 		// Get the foreground process group.
-		return mf.t.foregroundProcessGroup(ctx, io, args, true /* isMaster */)
+		return mf.t.foregroundProcessGroup(ctx, args, true /* isMaster */)
 	case linux.TIOCSPGRP:
 		// Set the foreground process group.
-		return mf.t.setForegroundProcessGroup(ctx, io, args, true /* isMaster */)
+		return mf.t.setForegroundProcessGroup(ctx, args, true /* isMaster */)
 	default:
 		maybeEmitUnimplementedEvent(ctx, cmd)
 		return 0, syserror.ENOTTY
diff --git a/pkg/sentry/fs/tty/queue.go b/pkg/sentry/fs/tty/queue.go
index c5d7ec717..f0a18c75a 100644
--- a/pkg/sentry/fs/tty/queue.go
+++ b/pkg/sentry/fs/tty/queue.go
@@ -19,10 +19,12 @@ import (
 	"gvisor.dev/gvisor/pkg/context"
 	"gvisor.dev/gvisor/pkg/safemem"
 	"gvisor.dev/gvisor/pkg/sentry/arch"
+	"gvisor.dev/gvisor/pkg/sentry/kernel"
 	"gvisor.dev/gvisor/pkg/sync"
 	"gvisor.dev/gvisor/pkg/syserror"
 	"gvisor.dev/gvisor/pkg/usermem"
 	"gvisor.dev/gvisor/pkg/waiter"
+	"gvisor.dev/gvisor/tools/go_marshal/primitive"
 )
 
 // LINT.IfChange
@@ -85,17 +87,15 @@ func (q *queue) writeReadiness(t *linux.KernelTermios) waiter.EventMask {
 }
 
 // readableSize writes the number of readable bytes to userspace.
-func (q *queue) readableSize(ctx context.Context, io usermem.IO, args arch.SyscallArguments) error {
+func (q *queue) readableSize(t *kernel.Task, args arch.SyscallArguments) error {
 	q.mu.Lock()
 	defer q.mu.Unlock()
-	var size int32
+	size := primitive.Int32(0)
 	if q.readable {
-		size = int32(len(q.readBuf))
+		size = primitive.Int32(len(q.readBuf))
 	}
 
-	_, err := usermem.CopyObjectOut(ctx, io, args[2].Pointer(), size, usermem.IOOpts{
-		AddressSpaceActive: true,
-	})
+	_, err := size.CopyOut(t, args[2].Pointer())
 	return err
 
 }
diff --git a/pkg/sentry/fs/tty/slave.go b/pkg/sentry/fs/tty/slave.go
index 7c7292687..933d2c3ff 100644
--- a/pkg/sentry/fs/tty/slave.go
+++ b/pkg/sentry/fs/tty/slave.go
@@ -20,9 +20,11 @@ import (
 	"gvisor.dev/gvisor/pkg/sentry/arch"
 	"gvisor.dev/gvisor/pkg/sentry/fs"
 	"gvisor.dev/gvisor/pkg/sentry/fs/fsutil"
+	"gvisor.dev/gvisor/pkg/sentry/kernel"
 	"gvisor.dev/gvisor/pkg/syserror"
 	"gvisor.dev/gvisor/pkg/usermem"
 	"gvisor.dev/gvisor/pkg/waiter"
+	"gvisor.dev/gvisor/tools/go_marshal/primitive"
 )
 
 // LINT.IfChange
@@ -136,39 +138,44 @@ func (sf *slaveFileOperations) Write(ctx context.Context, _ *fs.File, src userme
 
 // Ioctl implements fs.FileOperations.Ioctl.
 func (sf *slaveFileOperations) Ioctl(ctx context.Context, _ *fs.File, io usermem.IO, args arch.SyscallArguments) (uintptr, error) {
+	t := kernel.TaskFromContext(ctx)
+	if t == nil {
+		// ioctl(2) may only be called from a task goroutine.
+		return 0, syserror.ENOTTY
+	}
+
 	switch cmd := args[1].Uint(); cmd {
 	case linux.FIONREAD: // linux.FIONREAD == linux.TIOCINQ
 		// Get the number of bytes in the input queue read buffer.
-		return 0, sf.si.t.ld.inputQueueReadSize(ctx, io, args)
+		return 0, sf.si.t.ld.inputQueueReadSize(t, args)
 	case linux.TCGETS:
-		return sf.si.t.ld.getTermios(ctx, io, args)
+		return sf.si.t.ld.getTermios(t, args)
 	case linux.TCSETS:
-		return sf.si.t.ld.setTermios(ctx, io, args)
+		return sf.si.t.ld.setTermios(t, args)
 	case linux.TCSETSW:
 		// TODO(b/29356795): This should drain the output queue first.
-		return sf.si.t.ld.setTermios(ctx, io, args)
+		return sf.si.t.ld.setTermios(t, args)
 	case linux.TIOCGPTN:
-		_, err := usermem.CopyObjectOut(ctx, io, args[2].Pointer(), uint32(sf.si.t.n), usermem.IOOpts{
-			AddressSpaceActive: true,
-		})
+		nP := primitive.Uint32(sf.si.t.n)
+		_, err := nP.CopyOut(t, args[2].Pointer())
 		return 0, err
 	case linux.TIOCGWINSZ:
-		return 0, sf.si.t.ld.windowSize(ctx, io, args)
+		return 0, sf.si.t.ld.windowSize(t, args)
 	case linux.TIOCSWINSZ:
-		return 0, sf.si.t.ld.setWindowSize(ctx, io, args)
+		return 0, sf.si.t.ld.setWindowSize(t, args)
 	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 */)
+		return 0, sf.si.t.setControllingTTY(ctx, args, false /* isMaster */)
 	case linux.TIOCNOTTY:
 		// Release this process's controlling terminal.
-		return 0, sf.si.t.releaseControllingTTY(ctx, io, args, false /* isMaster */)
+		return 0, sf.si.t.releaseControllingTTY(ctx, args, false /* isMaster */)
 	case linux.TIOCGPGRP:
 		// Get the foreground process group.
-		return sf.si.t.foregroundProcessGroup(ctx, io, args, false /* isMaster */)
+		return sf.si.t.foregroundProcessGroup(ctx, args, false /* isMaster */)
 	case linux.TIOCSPGRP:
 		// Set the foreground process group.
-		return sf.si.t.setForegroundProcessGroup(ctx, io, args, false /* isMaster */)
+		return sf.si.t.setForegroundProcessGroup(ctx, args, false /* isMaster */)
 	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 ddcccf4da..56b59632d 100644
--- a/pkg/sentry/fs/tty/terminal.go
+++ b/pkg/sentry/fs/tty/terminal.go
@@ -20,7 +20,7 @@ import (
 	"gvisor.dev/gvisor/pkg/refs"
 	"gvisor.dev/gvisor/pkg/sentry/arch"
 	"gvisor.dev/gvisor/pkg/sentry/kernel"
-	"gvisor.dev/gvisor/pkg/usermem"
+	"gvisor.dev/gvisor/tools/go_marshal/primitive"
 )
 
 // LINT.IfChange
@@ -64,7 +64,7 @@ func newTerminal(ctx context.Context, d *dirInodeOperations, n uint32) *Terminal
 
 // 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 {
+func (tm *Terminal) setControllingTTY(ctx context.Context, args arch.SyscallArguments, isMaster bool) error {
 	task := kernel.TaskFromContext(ctx)
 	if task == nil {
 		panic("setControllingTTY must be called from a task context")
@@ -75,7 +75,7 @@ func (tm *Terminal) setControllingTTY(ctx context.Context, io usermem.IO, args a
 
 // 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 {
+func (tm *Terminal) releaseControllingTTY(ctx context.Context, args arch.SyscallArguments, isMaster bool) error {
 	task := kernel.TaskFromContext(ctx)
 	if task == nil {
 		panic("releaseControllingTTY must be called from a task context")
@@ -85,7 +85,7 @@ func (tm *Terminal) releaseControllingTTY(ctx context.Context, io usermem.IO, ar
 }
 
 // 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) {
+func (tm *Terminal) foregroundProcessGroup(ctx context.Context, args arch.SyscallArguments, isMaster bool) (uintptr, error) {
 	task := kernel.TaskFromContext(ctx)
 	if task == nil {
 		panic("foregroundProcessGroup must be called from a task context")
@@ -97,24 +97,21 @@ func (tm *Terminal) foregroundProcessGroup(ctx context.Context, io usermem.IO, a
 	}
 
 	// Write it out to *arg.
-	_, err = usermem.CopyObjectOut(ctx, io, args[2].Pointer(), int32(ret), usermem.IOOpts{
-		AddressSpaceActive: true,
-	})
+	retP := primitive.Int32(ret)
+	_, err = retP.CopyOut(task, args[2].Pointer())
 	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) {
+func (tm *Terminal) setForegroundProcessGroup(ctx context.Context, 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 {
+	var pgid primitive.Int32
+	if _, err := pgid.CopyIn(task, args[2].Pointer()); err != nil {
 		return 0, err
 	}