bump libcontainer to 902c012e85cdae6bb68d8c7a0df69a42f818ce96

Signed-off-by: Antonio Murdaca <amurdaca@redhat.com>

daemon/execdriver/driver.go

@@ -150,7 +150,7 @@ type Resources struct {
 	CpusetMems        string           `json:"cpuset_mems"`
 	CPUPeriod         int64            `json:"cpu_period"`
 	CPUQuota          int64            `json:"cpu_quota"`
-	BlkioWeight       int64            `json:"blkio_weight"`
+	BlkioWeight       uint16           `json:"blkio_weight"`
 	Rlimits           []*ulimit.Rlimit `json:"rlimits"`
 	OomKillDisable    bool             `json:"oom_kill_disable"`
 	MemorySwappiness  int64            `json:"memory_swappiness"`

daemon/execdriver/driver_unix.go

@@ -12,6 +12,7 @@ import (
 	"time"
 
 	"github.com/docker/docker/daemon/execdriver/native/template"
+	"github.com/docker/docker/pkg/mount"
 	"github.com/opencontainers/runc/libcontainer"
 	"github.com/opencontainers/runc/libcontainer/cgroups/fs"
 	"github.com/opencontainers/runc/libcontainer/configs"
@@ -37,7 +38,7 @@ func InitContainer(c *Command) *configs.Config {
 	container.Devices = c.AutoCreatedDevices
 	container.Rootfs = c.Rootfs
 	container.Readonlyfs = c.ReadonlyRootfs
-	container.Privatefs = true
+	container.RootPropagation = mount.RPRIVATE
 
 	// check to see if we are running in ramdisk to disable pivot root
 	container.NoPivotRoot = os.Getenv("DOCKER_RAMDISK") != ""

hack/vendor.sh

@@ -44,8 +44,8 @@ clone git github.com/endophage/gotuf 9bcdad0308e34a49f38448b8ad436ad8860825ce
 clone git github.com/jfrazelle/go 6e461eb70cb4187b41a84e9a567d7137bdbe0f16
 clone git github.com/agl/ed25519 d2b94fd789ea21d12fac1a4443dd3a3f79cda72c
 
-clone git github.com/opencontainers/runc fba07bce72e72ce5b2dd618e4f67dd86ccb49c82 # libcontainer
-# libcontainer deps (see src/github.com/docker/libcontainer/update-vendor.sh)
+clone git github.com/opencontainers/runc 902c012e85cdae6bb68d8c7a0df69a42f818ce96 # libcontainer
+# libcontainer deps (see src/github.com/opencontainers/runc/Godeps/Godeps.json)
 clone git github.com/coreos/go-systemd v3
 clone git github.com/godbus/dbus v2
 clone git github.com/syndtr/gocapability 66ef2aa7a23ba682594e2b6f74cf40c0692b49fb

pkg/mflag/flag.go

@@ -200,6 +200,24 @@ func (i *uint64Value) Get() interface{} { return uint64(*i) }
 
 func (i *uint64Value) String() string { return fmt.Sprintf("%v", *i) }
 
+// -- uint16 Value
+type uint16Value uint16
+
+func newUint16Value(val uint16, p *uint16) *uint16Value {
+	*p = val
+	return (*uint16Value)(p)
+}
+
+func (i *uint16Value) Set(s string) error {
+	v, err := strconv.ParseUint(s, 0, 16)
+	*i = uint16Value(v)
+	return err
+}
+
+func (i *uint16Value) Get() interface{} { return uint16(*i) }
+
+func (i *uint16Value) String() string { return fmt.Sprintf("%v", *i) }
+
 // -- string Value
 type stringValue string
 
@@ -757,6 +775,32 @@ func Uint64(names []string, value uint64, usage string) *uint64 {
 	return CommandLine.Uint64(names, value, usage)
 }
 
+// Uint16Var defines a uint16 flag with specified name, default value, and usage string.
+// The argument p points to a uint16 variable in which to store the value of the flag.
+func (fs *FlagSet) Uint16Var(p *uint16, names []string, value uint16, usage string) {
+	fs.Var(newUint16Value(value, p), names, usage)
+}
+
+// Uint16Var defines a uint16 flag with specified name, default value, and usage string.
+// The argument p points to a uint16 variable in which to store the value of the flag.
+func Uint16Var(p *uint16, names []string, value uint16, usage string) {
+	CommandLine.Var(newUint16Value(value, p), names, usage)
+}
+
+// Uint16 defines a uint16 flag with specified name, default value, and usage string.
+// The return value is the address of a uint16 variable that stores the value of the flag.
+func (fs *FlagSet) Uint16(names []string, value uint16, usage string) *uint16 {
+	p := new(uint16)
+	fs.Uint16Var(p, names, value, usage)
+	return p
+}
+
+// Uint16 defines a uint16 flag with specified name, default value, and usage string.
+// The return value is the address of a uint16 variable that stores the value of the flag.
+func Uint16(names []string, value uint16, usage string) *uint16 {
+	return CommandLine.Uint16(names, value, usage)
+}
+
 // StringVar defines a string flag with specified name, default value, and usage string.
 // The argument p points to a string variable in which to store the value of the flag.
 func (fs *FlagSet) StringVar(p *string, names []string, value string, usage string) {

runconfig/hostconfig.go

@@ -226,7 +226,7 @@ type HostConfig struct {
 	CpusetCpus        string                // CpusetCpus 0-2, 0,1
 	CpusetMems        string                // CpusetMems 0-2, 0,1
 	CPUQuota          int64                 `json:"CpuQuota"` // CPU CFS (Completely Fair Scheduler) quota
-	BlkioWeight       int64                 // Block IO weight (relative weight vs. other containers)
+	BlkioWeight       uint16                // Block IO weight (relative weight vs. other containers)
 	OomKillDisable    bool                  // Whether to disable OOM Killer or not
 	MemorySwappiness  *int64                // Tuning container memory swappiness behaviour
 	Privileged        bool                  // Is the container in privileged mode

runconfig/parse.go

@@ -86,7 +86,7 @@ func Parse(cmd *flag.FlagSet, args []string) (*Config, *HostConfig, *flag.FlagSe
 		flCPUQuota          = cmd.Int64([]string{"-cpu-quota"}, 0, "Limit CPU CFS (Completely Fair Scheduler) quota")
 		flCpusetCpus        = cmd.String([]string{"#-cpuset", "-cpuset-cpus"}, "", "CPUs in which to allow execution (0-3, 0,1)")
 		flCpusetMems        = cmd.String([]string{"-cpuset-mems"}, "", "MEMs in which to allow execution (0-3, 0,1)")
-		flBlkioWeight       = cmd.Int64([]string{"-blkio-weight"}, 0, "Block IO (relative weight), between 10 and 1000")
+		flBlkioWeight       = cmd.Uint16([]string{"-blkio-weight"}, 0, "Block IO (relative weight), between 10 and 1000")
 		flSwappiness        = cmd.Int64([]string{"-memory-swappiness"}, -1, "Tuning container memory swappiness (0 to 100)")
 		flNetMode           = cmd.String([]string{"-net"}, "default", "Set the Network mode for the container")
 		flMacAddress        = cmd.String([]string{"-mac-address"}, "", "Container MAC address (e.g. 92:d0:c6:0a:29:33)")

vendor/src/github.com/opencontainers/runc/libcontainer/cgroups/fs/blkio.go

@@ -32,33 +32,41 @@ func (s *BlkioGroup) Apply(d *data) error {
 
 func (s *BlkioGroup) Set(path string, cgroup *configs.Cgroup) error {
 	if cgroup.BlkioWeight != 0 {
-		if err := writeFile(path, "blkio.weight", strconv.FormatInt(cgroup.BlkioWeight, 10)); err != nil {
+		if err := writeFile(path, "blkio.weight", strconv.FormatUint(uint64(cgroup.BlkioWeight), 10)); err != nil {
 			return err
 		}
 	}
 
-	if cgroup.BlkioWeightDevice != "" {
-		if err := writeFile(path, "blkio.weight_device", cgroup.BlkioWeightDevice); err != nil {
+	if cgroup.BlkioLeafWeight != 0 {
+		if err := writeFile(path, "blkio.leaf_weight", strconv.FormatUint(uint64(cgroup.BlkioLeafWeight), 10)); err != nil {
 			return err
 		}
 	}
-	if cgroup.BlkioThrottleReadBpsDevice != "" {
-		if err := writeFile(path, "blkio.throttle.read_bps_device", cgroup.BlkioThrottleReadBpsDevice); err != nil {
+	for _, wd := range cgroup.BlkioWeightDevice {
+		if err := writeFile(path, "blkio.weight_device", wd.WeightString()); err != nil {
+			return err
+		}
+		if err := writeFile(path, "blkio.leaf_weight_device", wd.LeafWeightString()); err != nil {
+			return err
+		}
+	}
+	for _, td := range cgroup.BlkioThrottleReadBpsDevice {
+		if err := writeFile(path, "blkio.throttle.read_bps_device", td.String()); err != nil {
 			return err
 		}
 	}
-	if cgroup.BlkioThrottleWriteBpsDevice != "" {
-		if err := writeFile(path, "blkio.throttle.write_bps_device", cgroup.BlkioThrottleWriteBpsDevice); err != nil {
+	for _, td := range cgroup.BlkioThrottleWriteBpsDevice {
+		if err := writeFile(path, "blkio.throttle.write_bps_device", td.String()); err != nil {
 			return err
 		}
 	}
-	if cgroup.BlkioThrottleReadIOpsDevice != "" {
-		if err := writeFile(path, "blkio.throttle.read_iops_device", cgroup.BlkioThrottleReadIOpsDevice); err != nil {
+	for _, td := range cgroup.BlkioThrottleReadIOPSDevice {
+		if err := writeFile(path, "blkio.throttle.read_iops_device", td.String()); err != nil {
 			return err
 		}
 	}
-	if cgroup.BlkioThrottleWriteIOpsDevice != "" {
-		if err := writeFile(path, "blkio.throttle.write_iops_device", cgroup.BlkioThrottleWriteIOpsDevice); err != nil {
+	for _, td := range cgroup.BlkioThrottleWriteIOPSDevice {
+		if err := writeFile(path, "blkio.throttle.write_iops_device", td.String()); err != nil {
 			return err
 		}
 	}

vendor/src/github.com/opencontainers/runc/libcontainer/cgroups/fs/hugetlb.go

@@ -29,7 +29,7 @@ func (s *HugetlbGroup) Apply(d *data) error {
 
 func (s *HugetlbGroup) Set(path string, cgroup *configs.Cgroup) error {
 	for _, hugetlb := range cgroup.HugetlbLimit {
-		if err := writeFile(path, strings.Join([]string{"hugetlb", hugetlb.Pagesize, "limit_in_bytes"}, "."), strconv.Itoa(hugetlb.Limit)); err != nil {
+		if err := writeFile(path, strings.Join([]string{"hugetlb", hugetlb.Pagesize, "limit_in_bytes"}, "."), strconv.FormatUint(hugetlb.Limit, 10)); err != nil {
 			return err
 		}
 	}

vendor/src/github.com/opencontainers/runc/libcontainer/cgroups/fs/name.go

@@ -0,0 +1,25 @@
+package fs
+
+import (
+	"github.com/opencontainers/runc/libcontainer/cgroups"
+	"github.com/opencontainers/runc/libcontainer/configs"
+)
+
+type NameGroup struct {
+}
+
+func (s *NameGroup) Apply(d *data) error {
+	return nil
+}
+
+func (s *NameGroup) Set(path string, cgroup *configs.Cgroup) error {
+	return nil
+}
+
+func (s *NameGroup) Remove(d *data) error {
+	return nil
+}
+
+func (s *NameGroup) GetStats(path string, stats *cgroups.Stats) error {
+	return nil
+}

vendor/src/github.com/opencontainers/runc/libcontainer/cgroups/systemd/apply_systemd.go

@@ -34,17 +34,18 @@ type subsystem interface {
 }
 
 var subsystems = map[string]subsystem{
-	"devices":    &fs.DevicesGroup{},
-	"memory":     &fs.MemoryGroup{},
-	"cpu":        &fs.CpuGroup{},
-	"cpuset":     &fs.CpusetGroup{},
-	"cpuacct":    &fs.CpuacctGroup{},
-	"blkio":      &fs.BlkioGroup{},
-	"hugetlb":    &fs.HugetlbGroup{},
-	"perf_event": &fs.PerfEventGroup{},
-	"freezer":    &fs.FreezerGroup{},
-	"net_prio":   &fs.NetPrioGroup{},
-	"net_cls":    &fs.NetClsGroup{},
+	"devices":      &fs.DevicesGroup{},
+	"memory":       &fs.MemoryGroup{},
+	"cpu":          &fs.CpuGroup{},
+	"cpuset":       &fs.CpusetGroup{},
+	"cpuacct":      &fs.CpuacctGroup{},
+	"blkio":        &fs.BlkioGroup{},
+	"hugetlb":      &fs.HugetlbGroup{},
+	"perf_event":   &fs.PerfEventGroup{},
+	"freezer":      &fs.FreezerGroup{},
+	"net_prio":     &fs.NetPrioGroup{},
+	"net_cls":      &fs.NetClsGroup{},
+	"name=systemd": &fs.NameGroup{},
 }
 
 const (
@@ -176,7 +177,6 @@ func (m *Manager) Apply(pid int) error {
 		properties = append(properties,
 			newProp("MemoryLimit", uint64(c.Memory)))
 	}
-	// TODO: MemoryReservation and MemorySwap not available in systemd
 
 	if c.CpuShares != 0 {
 		properties = append(properties,
@@ -212,6 +212,7 @@ func (m *Manager) Apply(pid int) error {
 		return err
 	}
 
+	// TODO: MemoryReservation and MemorySwap not available in systemd
 	if err := joinMemory(c, pid); err != nil {
 		return err
 	}
@@ -236,6 +237,10 @@ func (m *Manager) Apply(pid int) error {
 	if err := joinHugetlb(c, pid); err != nil {
 		return err
 	}
+
+	if err := joinPerfEvent(c, pid); err != nil {
+		return err
+	}
 	// FIXME: Systemd does have `BlockIODeviceWeight` property, but we got problem
 	// using that (at least on systemd 208, see https://github.com/opencontainers/runc/libcontainer/pull/354),
 	// so use fs work around for now.
@@ -505,6 +510,12 @@ func joinMemory(c *configs.Cgroup, pid int) error {
 			return err
 		}
 	}
+	if c.MemoryReservation > 0 {
+		err = writeFile(path, "memory.soft_limit_in_bytes", strconv.FormatInt(c.MemoryReservation, 10))
+		if err != nil {
+			return err
+		}
+	}
 	if c.OomKillDisable {
 		if err := writeFile(path, "memory.oom_control", "1"); err != nil {
 			return err
@@ -547,28 +558,37 @@ func joinBlkio(c *configs.Cgroup, pid int) error {
 	if err != nil {
 		return err
 	}
-	if c.BlkioWeightDevice != "" {
-		if err := writeFile(path, "blkio.weight_device", c.BlkioWeightDevice); err != nil {
+	// systemd doesn't directly support this in the dbus properties
+	if c.BlkioLeafWeight != 0 {
+		if err := writeFile(path, "blkio.leaf_weight", strconv.FormatUint(uint64(c.BlkioLeafWeight), 10)); err != nil {
+			return err
+		}
+	}
+	for _, wd := range c.BlkioWeightDevice {
+		if err := writeFile(path, "blkio.weight_device", wd.WeightString()); err != nil {
+			return err
+		}
+		if err := writeFile(path, "blkio.leaf_weight_device", wd.LeafWeightString()); err != nil {
 			return err
 		}
 	}
-	if c.BlkioThrottleReadBpsDevice != "" {
-		if err := writeFile(path, "blkio.throttle.read_bps_device", c.BlkioThrottleReadBpsDevice); err != nil {
+	for _, td := range c.BlkioThrottleReadBpsDevice {
+		if err := writeFile(path, "blkio.throttle.read_bps_device", td.String()); err != nil {
 			return err
 		}
 	}
-	if c.BlkioThrottleWriteBpsDevice != "" {
-		if err := writeFile(path, "blkio.throttle.write_bps_device", c.BlkioThrottleWriteBpsDevice); err != nil {
+	for _, td := range c.BlkioThrottleWriteBpsDevice {
+		if err := writeFile(path, "blkio.throttle.write_bps_device", td.String()); err != nil {
 			return err
 		}
 	}
-	if c.BlkioThrottleReadIOpsDevice != "" {
-		if err := writeFile(path, "blkio.throttle.read_iops_device", c.BlkioThrottleReadIOpsDevice); err != nil {
+	for _, td := range c.BlkioThrottleReadIOPSDevice {
+		if err := writeFile(path, "blkio.throttle.read_iops_device", td.String()); err != nil {
 			return err
 		}
 	}
-	if c.BlkioThrottleWriteIOpsDevice != "" {
-		if err := writeFile(path, "blkio.throttle.write_iops_device", c.BlkioThrottleWriteIOpsDevice); err != nil {
+	for _, td := range c.BlkioThrottleWriteIOPSDevice {
+		if err := writeFile(path, "blkio.throttle.write_iops_device", td.String()); err != nil {
 			return err
 		}
 	}
@@ -585,3 +605,13 @@ func joinHugetlb(c *configs.Cgroup, pid int) error {
 	hugetlb := subsystems["hugetlb"]
 	return hugetlb.Set(path, c)
 }
+
+func joinPerfEvent(c *configs.Cgroup, pid int) error {
+	path, err := join(c, "perf_event", pid)
+	if err != nil && !cgroups.IsNotFound(err) {
+		return err
+	}
+
+	perfEvent := subsystems["perf_event"]
+	return perfEvent.Set(path, c)
+}

vendor/src/github.com/opencontainers/runc/libcontainer/configs/blkio_device.go

@@ -0,0 +1,61 @@
+package configs
+
+import "fmt"
+
+// blockIODevice holds major:minor format supported in blkio cgroup
+type blockIODevice struct {
+	// Major is the device's major number
+	Major int64 `json:"major"`
+	// Minor is the device's minor number
+	Minor int64 `json:"minor"`
+}
+
+// WeightDevice struct holds a `major:minor weight`|`major:minor leaf_weight` pair
+type WeightDevice struct {
+	blockIODevice
+	// Weight is the bandwidth rate for the device, range is from 10 to 1000
+	Weight uint16 `json:"weight"`
+	// LeafWeight is the bandwidth rate for the device while competing with the cgroup's child cgroups, range is from 10 to 1000, cfq scheduler only
+	LeafWeight uint16 `json:"leafWeight"`
+}
+
+// NewWeightDevice returns a configured WeightDevice pointer
+func NewWeightDevice(major, minor int64, weight, leafWeight uint16) *WeightDevice {
+	wd := &WeightDevice{}
+	wd.Major = major
+	wd.Minor = minor
+	wd.Weight = weight
+	wd.LeafWeight = leafWeight
+	return wd
+}
+
+// WeightString formats the struct to be writable to the cgroup specific file
+func (wd *WeightDevice) WeightString() string {
+	return fmt.Sprintf("%d:%d %d", wd.Major, wd.Minor, wd.Weight)
+}
+
+// LeafWeightString formats the struct to be writable to the cgroup specific file
+func (wd *WeightDevice) LeafWeightString() string {
+	return fmt.Sprintf("%d:%d %d", wd.Major, wd.Minor, wd.LeafWeight)
+}
+
+// ThrottleDevice struct holds a `major:minor rate_per_second` pair
+type ThrottleDevice struct {
+	blockIODevice
+	// Rate is the IO rate limit per cgroup per device
+	Rate uint64 `json:"rate"`
+}
+
+// NewThrottleDevice returns a configured ThrottleDevice pointer
+func NewThrottleDevice(major, minor int64, rate uint64) *ThrottleDevice {
+	td := &ThrottleDevice{}
+	td.Major = major
+	td.Minor = minor
+	td.Rate = rate
+	return td
+}
+
+// String formats the struct to be writable to the cgroup specific file
+func (td *ThrottleDevice) String() string {
+	return fmt.Sprintf("%d:%d %d", td.Major, td.Minor, td.Rate)
+}

vendor/src/github.com/opencontainers/runc/libcontainer/configs/cgroup.go

@@ -57,23 +57,26 @@ type Cgroup struct {
 	// MEM to use
 	CpusetMems string `json:"cpuset_mems"`
 
+	// Specifies per cgroup weight, range is from 10 to 1000.
+	BlkioWeight uint16 `json:"blkio_weight"`
+
+	// Specifies tasks' weight in the given cgroup while competing with the cgroup's child cgroups, range is from 10 to 1000, cfq scheduler only
+	BlkioLeafWeight uint16 `json:"blkio_leaf_weight"`
+
+	// Weight per cgroup per device, can override BlkioWeight.
+	BlkioWeightDevice []*WeightDevice `json:"blkio_weight_device"`
+
 	// IO read rate limit per cgroup per device, bytes per second.
-	BlkioThrottleReadBpsDevice string `json:"blkio_throttle_read_bps_device"`
+	BlkioThrottleReadBpsDevice []*ThrottleDevice `json:"blkio_throttle_read_bps_device"`
 
 	// IO write rate limit per cgroup per divice, bytes per second.
-	BlkioThrottleWriteBpsDevice string `json:"blkio_throttle_write_bps_device"`
+	BlkioThrottleWriteBpsDevice []*ThrottleDevice `json:"blkio_throttle_write_bps_device"`
 
 	// IO read rate limit per cgroup per device, IO per second.
-	BlkioThrottleReadIOpsDevice string `json:"blkio_throttle_read_iops_device"`
+	BlkioThrottleReadIOPSDevice []*ThrottleDevice `json:"blkio_throttle_read_iops_device"`
 
 	// IO write rate limit per cgroup per device, IO per second.
-	BlkioThrottleWriteIOpsDevice string `json:"blkio_throttle_write_iops_device"`
-
-	// Specifies per cgroup weight, range is from 10 to 1000.
-	BlkioWeight int64 `json:"blkio_weight"`
-
-	// Weight per cgroup per device, can override BlkioWeight.
-	BlkioWeightDevice string `json:"blkio_weight_device"`
+	BlkioThrottleWriteIOPSDevice []*ThrottleDevice `json:"blkio_throttle_write_iops_device"`
 
 	// set the freeze value for the process
 	Freezer FreezerState `json:"freezer"`

vendor/src/github.com/opencontainers/runc/libcontainer/configs/config.go

@@ -92,8 +92,8 @@ type Config struct {
 	// bind mounts are writtable.
 	Readonlyfs bool `json:"readonlyfs"`
 
-	// Privatefs will mount the container's rootfs as private where mount points from the parent will not propogate
-	Privatefs bool `json:"privatefs"`
+	// Specifies the mount propagation flags to be applied to /.
+	RootPropagation int `json:"rootPropagation"`
 
 	// Mounts specify additional source and destination paths that will be mounted inside the container's
 	// rootfs and mount namespace if specified

vendor/src/github.com/opencontainers/runc/libcontainer/configs/config_unix.go

@@ -21,7 +21,7 @@ func (c Config) HostUID() (int, error) {
 	return 0, nil
 }
 
-// Gets the root uid for the process on host which could be non-zero
+// Gets the root gid for the process on host which could be non-zero
 // when user namespaces are enabled.
 func (c Config) HostGID() (int, error) {
 	if c.Namespaces.Contains(NEWUSER) {
@@ -30,11 +30,11 @@ func (c Config) HostGID() (int, error) {
 		}
 		id, found := c.hostIDFromMapping(0, c.GidMappings)
 		if !found {
-			return -1, fmt.Errorf("User namespaces enabled, but no root user mapping found.")
+			return -1, fmt.Errorf("User namespaces enabled, but no root group mapping found.")
 		}
 		return id, nil
 	}
-	// Return default root uid 0
+	// Return default root gid 0
 	return 0, nil
 }
 

vendor/src/github.com/opencontainers/runc/libcontainer/configs/hugepage_limit.go

@@ -5,5 +5,5 @@ type HugepageLimit struct {
 	Pagesize string `json:"page_size"`
 
 	// usage limit for hugepage.
-	Limit int `json:"limit"`
+	Limit uint64 `json:"limit"`
 }

vendor/src/github.com/opencontainers/runc/libcontainer/nsenter/nsexec.c

@@ -23,7 +23,7 @@ struct clone_arg {
 	 * Reserve some space for clone() to locate arguments
 	 * and retcode in this place
 	 */
-	char stack[4096] __attribute__ ((aligned(8)));
+	char stack[4096] __attribute__ ((aligned(16)));
 	char stack_ptr[0];
 	jmp_buf *env;
 };

vendor/src/github.com/opencontainers/runc/libcontainer/rootfs_linux.go

@@ -13,6 +13,7 @@ import (
 	"syscall"
 	"time"
 
+	"github.com/docker/docker/pkg/mount"
 	"github.com/docker/docker/pkg/symlink"
 	"github.com/opencontainers/runc/libcontainer/cgroups"
 	"github.com/opencontainers/runc/libcontainer/configs"
@@ -341,7 +342,7 @@ func setupDevSymlinks(rootfs string) error {
 // symlinks are resolved locally.
 func reOpenDevNull() error {
 	var stat, devNullStat syscall.Stat_t
-	file, err := os.Open("/dev/null")
+	file, err := os.OpenFile("/dev/null", os.O_RDWR, 0)
 	if err != nil {
 		return fmt.Errorf("Failed to open /dev/null - %s", err)
 	}
@@ -420,14 +421,89 @@ func mknodDevice(dest string, node *configs.Device) error {
 	return syscall.Chown(dest, int(node.Uid), int(node.Gid))
 }
 
+func getMountInfo(mountinfo []*mount.Info, dir string) *mount.Info {
+	for _, m := range mountinfo {
+		if m.Mountpoint == dir {
+			return m
+		}
+	}
+	return nil
+}
+
+// Get the parent mount point of directory passed in as argument. Also return
+// optional fields.
+func getParentMount(rootfs string) (string, string, error) {
+	var path string
+
+	mountinfos, err := mount.GetMounts()
+	if err != nil {
+		return "", "", err
+	}
+
+	mountinfo := getMountInfo(mountinfos, rootfs)
+	if mountinfo != nil {
+		return rootfs, mountinfo.Optional, nil
+	}
+
+	path = rootfs
+	for {
+		path = filepath.Dir(path)
+
+		mountinfo = getMountInfo(mountinfos, path)
+		if mountinfo != nil {
+			return path, mountinfo.Optional, nil
+		}
+
+		if path == "/" {
+			break
+		}
+	}
+
+	// If we are here, we did not find parent mount. Something is wrong.
+	return "", "", fmt.Errorf("Could not find parent mount of %s", rootfs)
+}
+
+// Make parent mount private if it was shared
+func rootfsParentMountPrivate(config *configs.Config) error {
+	sharedMount := false
+
+	parentMount, optionalOpts, err := getParentMount(config.Rootfs)
+	if err != nil {
+		return err
+	}
+
+	optsSplit := strings.Split(optionalOpts, " ")
+	for _, opt := range optsSplit {
+		if strings.HasPrefix(opt, "shared:") {
+			sharedMount = true
+			break
+		}
+	}
+
+	// Make parent mount PRIVATE if it was shared. It is needed for two
+	// reasons. First of all pivot_root() will fail if parent mount is
+	// shared. Secondly when we bind mount rootfs it will propagate to
+	// parent namespace and we don't want that to happen.
+	if sharedMount {
+		return syscall.Mount("", parentMount, "", syscall.MS_PRIVATE, "")
+	}
+
+	return nil
+}
+
 func prepareRoot(config *configs.Config) error {
 	flag := syscall.MS_SLAVE | syscall.MS_REC
-	if config.Privatefs {
-		flag = syscall.MS_PRIVATE | syscall.MS_REC
+	if config.RootPropagation != 0 {
+		flag = config.RootPropagation
 	}
 	if err := syscall.Mount("", "/", "", uintptr(flag), ""); err != nil {
 		return err
 	}
+
+	if err := rootfsParentMountPrivate(config); err != nil {
+		return err
+	}
+
 	return syscall.Mount(config.Rootfs, config.Rootfs, "bind", syscall.MS_BIND|syscall.MS_REC, "")
 }
 
@@ -469,6 +545,13 @@ func pivotRoot(rootfs, pivotBaseDir string) error {
 	}
 	// path to pivot dir now changed, update
 	pivotDir = filepath.Join(pivotBaseDir, filepath.Base(pivotDir))
+
+	// Make pivotDir rprivate to make sure any of the unmounts don't
+	// propagate to parent.
+	if err := syscall.Mount("", pivotDir, "", syscall.MS_PRIVATE|syscall.MS_REC, ""); err != nil {
+		return err
+	}
+
 	if err := syscall.Unmount(pivotDir, syscall.MNT_DETACH); err != nil {
 		return fmt.Errorf("unmount pivot_root dir %s", err)
 	}

vendor/src/github.com/opencontainers/runc/libcontainer/user/user.go

@@ -349,21 +349,26 @@ func GetExecUser(userSpec string, defaults *ExecUser, passwd, group io.Reader) (
 	return user, nil
 }
 
-// GetAdditionalGroups looks up a list of groups by name or group id against
-// against the given /etc/group formatted data. If a group name cannot be found,
-// an error will be returned. If a group id cannot be found, it will be returned
-// as-is.
+// GetAdditionalGroups looks up a list of groups by name or group id
+// against the given /etc/group formatted data. If a group name cannot
+// be found, an error will be returned. If a group id cannot be found,
+// or the given group data is nil, the id will be returned as-is
+// provided it is in the legal range.
 func GetAdditionalGroups(additionalGroups []string, group io.Reader) ([]int, error) {
-	groups, err := ParseGroupFilter(group, func(g Group) bool {
-		for _, ag := range additionalGroups {
-			if g.Name == ag || strconv.Itoa(g.Gid) == ag {
-				return true
+	var groups = []Group{}
+	if group != nil {
+		var err error
+		groups, err = ParseGroupFilter(group, func(g Group) bool {
+			for _, ag := range additionalGroups {
+				if g.Name == ag || strconv.Itoa(g.Gid) == ag {
+					return true
+				}
 			}
+			return false
+		})
+		if err != nil {
+			return nil, fmt.Errorf("Unable to find additional groups %v: %v", additionalGroups, err)
 		}
-		return false
-	})
-	if err != nil {
-		return nil, fmt.Errorf("Unable to find additional groups %v: %v", additionalGroups, err)
 	}
 
 	gidMap := make(map[int]struct{})
@@ -401,13 +406,13 @@ func GetAdditionalGroups(additionalGroups []string, group io.Reader) ([]int, err
 	return gids, nil
 }
 
-// Wrapper around GetAdditionalGroups that opens the groupPath given and gives
-// it as an argument to GetAdditionalGroups.
+// GetAdditionalGroupsPath is a wrapper around GetAdditionalGroups
+// that opens the groupPath given and gives it as an argument to
+// GetAdditionalGroups.
 func GetAdditionalGroupsPath(additionalGroups []string, groupPath string) ([]int, error) {
 	group, err := os.Open(groupPath)
-	if err != nil {
-		return nil, fmt.Errorf("Failed to open group file: %v", err)
+	if err == nil {
+		defer group.Close()
 	}
-	defer group.Close()
 	return GetAdditionalGroups(additionalGroups, group)
 }