Merge 682fd2d6 (automated)

3 files changed, 104 insertions, 5 deletions

diff --git a/pkg/sentry/fs/dev/dev.go b/pkg/sentry/fs/dev/dev.go
index d4bbd9807..f739c476c 100644
--- a/pkg/sentry/fs/dev/dev.go
+++ b/pkg/sentry/fs/dev/dev.go
@@ -38,12 +38,20 @@ const (
 	urandomDevMinor uint32 = 9
 )
 
-func newCharacterDevice(ctx context.Context, iops fs.InodeOperations, msrc *fs.MountSource) *fs.Inode {
+// TTY major device number comes from include/uapi/linux/major.h.
+const (
+	ttyDevMinor = 0
+	ttyDevMajor = 5
+)
+
+func newCharacterDevice(ctx context.Context, iops fs.InodeOperations, msrc *fs.MountSource, major uint16, minor uint32) *fs.Inode {
 	return fs.NewInode(ctx, iops, msrc, fs.StableAttr{
-		DeviceID:  devDevice.DeviceID(),
-		InodeID:   devDevice.NextIno(),
-		BlockSize: usermem.PageSize,
-		Type:      fs.CharacterDevice,
+		DeviceID:        devDevice.DeviceID(),
+		InodeID:         devDevice.NextIno(),
+		BlockSize:       usermem.PageSize,
+		Type:            fs.CharacterDevice,
+		DeviceFileMajor: major,
+		DeviceFileMinor: minor,
 	})
 }
 
@@ -114,6 +122,8 @@ func New(ctx context.Context, msrc *fs.MountSource) *fs.Inode {
 		// If no devpts is mounted, this will simply be a dangling
 		// symlink, which is fine.
 		"ptmx": newSymlink(ctx, "pts/ptmx", msrc),
+
+		"tty": newCharacterDevice(ctx, newTTYDevice(ctx, fs.RootOwner, 0666), msrc, ttyDevMajor, ttyDevMinor),
 	}
 
 	iops := ramfs.NewDir(ctx, contents, fs.RootOwner, fs.FilePermsFromMode(0555))
diff --git a/pkg/sentry/fs/dev/dev_state_autogen.go b/pkg/sentry/fs/dev/dev_state_autogen.go
index 0afbc170f..a997f3ecf 100755
--- a/pkg/sentry/fs/dev/dev_state_autogen.go
+++ b/pkg/sentry/fs/dev/dev_state_autogen.go
@@ -95,6 +95,26 @@ func (x *randomFileOperations) afterLoad() {}
 func (x *randomFileOperations) load(m state.Map) {
 }
 
+func (x *ttyInodeOperations) beforeSave() {}
+func (x *ttyInodeOperations) save(m state.Map) {
+	x.beforeSave()
+	m.Save("InodeSimpleAttributes", &x.InodeSimpleAttributes)
+}
+
+func (x *ttyInodeOperations) afterLoad() {}
+func (x *ttyInodeOperations) load(m state.Map) {
+	m.Load("InodeSimpleAttributes", &x.InodeSimpleAttributes)
+}
+
+func (x *ttyFileOperations) beforeSave() {}
+func (x *ttyFileOperations) save(m state.Map) {
+	x.beforeSave()
+}
+
+func (x *ttyFileOperations) afterLoad() {}
+func (x *ttyFileOperations) load(m state.Map) {
+}
+
 func init() {
 	state.Register("dev.filesystem", (*filesystem)(nil), state.Fns{Save: (*filesystem).save, Load: (*filesystem).load})
 	state.Register("dev.fullDevice", (*fullDevice)(nil), state.Fns{Save: (*fullDevice).save, Load: (*fullDevice).load})
@@ -105,4 +125,6 @@ func init() {
 	state.Register("dev.zeroFileOperations", (*zeroFileOperations)(nil), state.Fns{Save: (*zeroFileOperations).save, Load: (*zeroFileOperations).load})
 	state.Register("dev.randomDevice", (*randomDevice)(nil), state.Fns{Save: (*randomDevice).save, Load: (*randomDevice).load})
 	state.Register("dev.randomFileOperations", (*randomFileOperations)(nil), state.Fns{Save: (*randomFileOperations).save, Load: (*randomFileOperations).load})
+	state.Register("dev.ttyInodeOperations", (*ttyInodeOperations)(nil), state.Fns{Save: (*ttyInodeOperations).save, Load: (*ttyInodeOperations).load})
+	state.Register("dev.ttyFileOperations", (*ttyFileOperations)(nil), state.Fns{Save: (*ttyFileOperations).save, Load: (*ttyFileOperations).load})
 }
diff --git a/pkg/sentry/fs/dev/tty.go b/pkg/sentry/fs/dev/tty.go
new file mode 100644
index 000000000..87d80e292
--- /dev/null
+++ b/pkg/sentry/fs/dev/tty.go
@@ -0,0 +1,67 @@
+// Copyright 2019 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package dev
+
+import (
+	"gvisor.dev/gvisor/pkg/abi/linux"
+	"gvisor.dev/gvisor/pkg/sentry/context"
+	"gvisor.dev/gvisor/pkg/sentry/fs"
+	"gvisor.dev/gvisor/pkg/sentry/fs/fsutil"
+	"gvisor.dev/gvisor/pkg/waiter"
+)
+
+// +stateify savable
+type ttyInodeOperations struct {
+	fsutil.InodeGenericChecker       `state:"nosave"`
+	fsutil.InodeNoExtendedAttributes `state:"nosave"`
+	fsutil.InodeNoopAllocate         `state:"nosave"`
+	fsutil.InodeNoopRelease          `state:"nosave"`
+	fsutil.InodeNoopTruncate         `state:"nosave"`
+	fsutil.InodeNoopWriteOut         `state:"nosave"`
+	fsutil.InodeNotDirectory         `state:"nosave"`
+	fsutil.InodeNotMappable          `state:"nosave"`
+	fsutil.InodeNotOpenable          `state:"nosave"`
+	fsutil.InodeNotSocket            `state:"nosave"`
+	fsutil.InodeNotSymlink           `state:"nosave"`
+	fsutil.InodeVirtual              `state:"nosave"`
+
+	fsutil.InodeSimpleAttributes
+}
+
+var _ fs.InodeOperations = (*ttyInodeOperations)(nil)
+
+func newTTYDevice(ctx context.Context, owner fs.FileOwner, mode linux.FileMode) *ttyInodeOperations {
+	return &ttyInodeOperations{
+		InodeSimpleAttributes: fsutil.NewInodeSimpleAttributes(ctx, owner, fs.FilePermsFromMode(mode), linux.TMPFS_MAGIC),
+	}
+}
+
+// +stateify savable
+type ttyFileOperations struct {
+	fsutil.FileNoSeek               `state:"nosave"`
+	fsutil.FileNoIoctl              `state:"nosave"`
+	fsutil.FileNoMMap               `state:"nosave"`
+	fsutil.FileNoSplice             `state:"nosave"`
+	fsutil.FileNoopFlush            `state:"nosave"`
+	fsutil.FileNoopFsync            `state:"nosave"`
+	fsutil.FileNoopRelease          `state:"nosave"`
+	fsutil.FileNoopWrite            `state:"nosave"`
+	fsutil.FileNoopRead             `state:"nosave"`
+	fsutil.FileNotDirReaddir        `state:"nosave"`
+	fsutil.FileUseInodeUnstableAttr `state:"nosave"`
+	waiter.AlwaysReady              `state:"nosave"`
+}
+
+var _ fs.FileOperations = (*ttyFileOperations)(nil)