Merge release-20200608.0-83-g3970c1274 (automated)

pkg/abi/linux/linux_abi_autogen_unsafe.go

@@ -129,7 +129,7 @@ func (s *Statx) Packed() bool {
 
 // MarshalUnsafe implements marshal.Marshallable.MarshalUnsafe.
 func (s *Statx) MarshalUnsafe(dst []byte) {
-    if s.Ctime.Packed() && s.Mtime.Packed() && s.Atime.Packed() && s.Btime.Packed() {
+    if s.Mtime.Packed() && s.Atime.Packed() && s.Btime.Packed() && s.Ctime.Packed() {
         safecopy.CopyIn(dst, unsafe.Pointer(s))
     } else {
         s.MarshalBytes(dst)
@@ -138,7 +138,7 @@ func (s *Statx) MarshalUnsafe(dst []byte) {
 
 // UnmarshalUnsafe implements marshal.Marshallable.UnmarshalUnsafe.
 func (s *Statx) UnmarshalUnsafe(src []byte) {
-    if s.Atime.Packed() && s.Btime.Packed() && s.Ctime.Packed() && s.Mtime.Packed() {
+    if s.Btime.Packed() && s.Ctime.Packed() && s.Mtime.Packed() && s.Atime.Packed() {
         safecopy.CopyOut(unsafe.Pointer(s), src)
     } else {
         s.UnmarshalBytes(src)
@@ -204,7 +204,7 @@ func (s *Statx) CopyIn(task marshal.Task, addr usermem.Addr) (int, error) {
 
 // WriteTo implements io.WriterTo.WriteTo.
 func (s *Statx) WriteTo(w io.Writer) (int64, error) {
-    if !s.Mtime.Packed() && s.Atime.Packed() && s.Btime.Packed() && s.Ctime.Packed() {
+    if !s.Atime.Packed() && s.Btime.Packed() && s.Ctime.Packed() && s.Mtime.Packed() {
         // Type Statx doesn't have a packed layout in memory, fall back to MarshalBytes.
         buf := make([]byte, s.SizeBytes())
         s.MarshalBytes(buf)

pkg/cpuid/cpuid_arm64.go

@@ -312,8 +312,9 @@ func HostFeatureSet() *FeatureSet {
 	}
 }
 
-// Reads bogomips from host /proc/cpuinfo. Must run before whitelisting.
-// This value is used to create the fake /proc/cpuinfo from a FeatureSet.
+// Reads bogomips from host /proc/cpuinfo. Must run before syscall filter
+// installation. This value is used to create the fake /proc/cpuinfo from a
+// FeatureSet.
 func initCPUInfo() {
 	cpuinfob, err := ioutil.ReadFile("/proc/cpuinfo")
 	if err != nil {

pkg/cpuid/cpuid_x86.go

@@ -1057,9 +1057,9 @@ func HostFeatureSet() *FeatureSet {
 	}
 }
 
-// Reads max cpu frequency from host /proc/cpuinfo. Must run before
-// whitelisting. This value is used to create the fake /proc/cpuinfo from a
-// FeatureSet.
+// Reads max cpu frequency from host /proc/cpuinfo. Must run before syscall
+// filter installation. This value is used to create the fake /proc/cpuinfo
+// from a FeatureSet.
 func initCPUFreq() {
 	cpuinfob, err := ioutil.ReadFile("/proc/cpuinfo")
 	if err != nil {
@@ -1106,7 +1106,6 @@ func initFeaturesFromString() {
 }
 
 func init() {
-	// initCpuFreq must be run before whitelists are enabled.
 	initCPUFreq()
 	initFeaturesFromString()
 }

pkg/seccomp/seccomp_rules.go

@@ -56,7 +56,7 @@ func (a AllowValue) String() (s string) {
 	return fmt.Sprintf("%#x ", uintptr(a))
 }
 
-// Rule stores the whitelist of syscall arguments.
+// Rule stores the allowed syscall arguments.
 //
 // For example:
 // rule := Rule {
@@ -82,7 +82,7 @@ func (r Rule) String() (s string) {
 	return
 }
 
-// SyscallRules stores a map of OR'ed whitelist rules indexed by the syscall number.
+// SyscallRules stores a map of OR'ed argument rules indexed by the syscall number.
 // If the 'Rules' is empty, we treat it as any argument is allowed.
 //
 // For example:

pkg/sentry/fs/filesystems.go

@@ -87,20 +87,6 @@ func RegisterFilesystem(f Filesystem) {
 	filesystems.registered[f.Name()] = f
 }
 
-// UnregisterFilesystem removes a file system from the global set. To keep the
-// file system set compatible with save/restore, UnregisterFilesystem must be
-// called before save/restore methods.
-//
-// For instance, packages may unregister their file system after it is mounted.
-// This makes sense for pseudo file systems that should not be visible or
-// mountable. See whitelistfs in fs/host/fs.go for one example.
-func UnregisterFilesystem(name string) {
-	filesystems.mu.Lock()
-	defer filesystems.mu.Unlock()
-
-	delete(filesystems.registered, name)
-}
-
 // FindFilesystem returns a Filesystem registered at name or (nil, false) if name
 // is not a file system type that can be found in /proc/filesystems.
 func FindFilesystem(name string) (Filesystem, bool) {

pkg/sentry/fsimpl/host/host.go

@@ -476,8 +476,9 @@ func (i *inode) open(ctx context.Context, d *vfs.Dentry, mnt *vfs.Mount, flags u
 		return unixsocket.NewFileDescription(ep, ep.Type(), flags, mnt, d, &i.locks)
 	}
 
-	// TODO(gvisor.dev/issue/1672): Whitelist specific file types here, so that
-	// we don't allow importing arbitrary file types without proper support.
+	// TODO(gvisor.dev/issue/1672): Allow only specific file types here, so
+	// that we don't allow importing arbitrary file types without proper
+	// support.
 	if i.isTTY {
 		fd := &TTYFileDescription{
 			fileDescription: fileDescription{inode: i},

pkg/sentry/socket/hostinet/socket.go

@@ -324,7 +324,7 @@ func (s *socketOpsCommon) GetSockOpt(t *kernel.Task, level int, name int, outPtr
 		return nil, syserr.ErrInvalidArgument
 	}
 
-	// Whitelist options and constrain option length.
+	// Only allow known and safe options.
 	optlen := getSockOptLen(t, level, name)
 	switch level {
 	case linux.SOL_IP:
@@ -369,7 +369,7 @@ func (s *socketOpsCommon) GetSockOpt(t *kernel.Task, level int, name int, outPtr
 
 // SetSockOpt implements socket.Socket.SetSockOpt.
 func (s *socketOpsCommon) SetSockOpt(t *kernel.Task, level int, name int, opt []byte) *syserr.Error {
-	// Whitelist options and constrain option length.
+	// Only allow known and safe options.
 	optlen := setSockOptLen(t, level, name)
 	switch level {
 	case linux.SOL_IP:
@@ -415,7 +415,7 @@ func (s *socketOpsCommon) SetSockOpt(t *kernel.Task, level int, name int, opt []
 
 // RecvMsg implements socket.Socket.RecvMsg.
 func (s *socketOpsCommon) RecvMsg(t *kernel.Task, dst usermem.IOSequence, flags int, haveDeadline bool, deadline ktime.Time, senderRequested bool, controlLen uint64) (int, int, linux.SockAddr, uint32, socket.ControlMessages, *syserr.Error) {
-	// Whitelist flags.
+	// Only allow known and safe flags.
 	//
 	// FIXME(jamieliu): We can't support MSG_ERRQUEUE because it uses ancillary
 	// messages that gvisor/pkg/tcpip/transport/unix doesn't understand. Kill the
@@ -537,7 +537,7 @@ func (s *socketOpsCommon) RecvMsg(t *kernel.Task, dst usermem.IOSequence, flags
 
 // SendMsg implements socket.Socket.SendMsg.
 func (s *socketOpsCommon) SendMsg(t *kernel.Task, src usermem.IOSequence, to []byte, flags int, haveDeadline bool, deadline ktime.Time, controlMessages socket.ControlMessages) (int, *syserr.Error) {
-	// Whitelist flags.
+	// Only allow known and safe flags.
 	if flags&^(syscall.MSG_DONTWAIT|syscall.MSG_EOR|syscall.MSG_FASTOPEN|syscall.MSG_MORE|syscall.MSG_NOSIGNAL) != 0 {
 		return 0, syserr.ErrInvalidArgument
 	}