update runc library to v1.0.0-rc10 (CVE-2019-19921)

Notable changes:
* Fix CVE-2019-19921 (Volume mount race condition with shared mounts): https://github.com/opencontainers/runc/pull/2207
* Fix exec FIFO race: https://github.com/opencontainers/runc/pull/2185
* Basic support for cgroup v2.  Almost feature-complete, but still missing support for systemd mode in rootless.
  See also https://github.com/opencontainers/runc/issues/2209 for the known issues.

Full changes: https://github.com/opencontainers/runc/compare/v1.0.0-rc9...v1.0.0-rc10

Also updates go-selinux: 3a1f366feb...5215b1806f
(See https://github.com/containerd/cri/pull/1383#issuecomment-578227009)

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

vendor.conf

@@ -80,7 +80,7 @@ google.golang.org/grpc                              39e8a7b072a67ca2a75f57fa2e0d
 # the containerd project first, and update both after that is merged.
 # This commit does not need to match RUNC_COMMIT as it is used for helper
 # packages but should be newer or equal.
-github.com/opencontainers/runc                      d736ef14f0288d6993a1845745d6756cfc9ddd5a # v1.0.0-rc9
+github.com/opencontainers/runc                      dc9208a3303feef5b3839f4323d9beb36df0a9dd # v1.0.0-rc10
 github.com/opencontainers/runtime-spec              29686dbc5559d93fb1ef402eeda3e35c38d75af4 # v1.0.1-59-g29686db
 github.com/opencontainers/image-spec                d60099175f88c47cd379c4738d158884749ed235 # v1.0.1
 github.com/seccomp/libseccomp-golang                689e3c1541a84461afc49c1c87352a6cedf72e9c # v0.9.1
@@ -162,6 +162,6 @@ github.com/morikuni/aec                             39771216ff4c63d11f5e604076f9
 # metrics
 github.com/docker/go-metrics                        b619b3592b65de4f087d9f16863a7e6ff905973c # v0.0.1
 
-github.com/opencontainers/selinux                   3a1f366feb7aecbf7a0e71ac4cea88b31597de9e # v1.2.2
+github.com/opencontainers/selinux                   5215b1806f52b1fcc2070a8826c542c9d33cd3cf
 
 # DO NOT EDIT BELOW THIS LINE -------- reserved for downstream projects --------

vendor/github.com/opencontainers/runc/README.md

@@ -16,9 +16,13 @@ This means that `runc` 1.0.0 should implement the 1.0 version of the specificati
 
 You can find official releases of `runc` on the [release](https://github.com/opencontainers/runc/releases) page.
 
+Currently, the following features are not considered to be production-ready:
+
+* Support for cgroup v2
+
 ## Security
 
-Reporting process and disclosure communications are outlined in [/org/security](https://github.com/opencontainers/org/blob/master/security/)
+The reporting process and disclosure communications are outlined in [/org/security](https://github.com/opencontainers/org/blob/master/security/).
 
 ## Building
 
@@ -229,7 +233,14 @@ runc delete mycontainerid
 This allows higher level systems to augment the containers creation logic with setup of various settings after the container is created and/or before it is deleted. For example, the container's network stack is commonly set up after `create` but before `start`.
 
 #### Rootless containers
-`runc` has the ability to run containers without root privileges. This is called `rootless`. You need to pass some parameters to `runc` in order to run rootless containers. See below and compare with the previous version. Run the following commands as an ordinary user:
+`runc` has the ability to run containers without root privileges. This is called `rootless`. You need to pass some parameters to `runc` in order to run rootless containers. See below and compare with the previous version.
+
+**Note:** In order to use this feature, "User Namespaces" must be compiled and enabled in your kernel. There are various ways to do this depending on your distribution:
+- Confirm `CONFIG_USER_NS=y` is set in your kernel configuration (normally found in `/proc/config.gz`)
+- Arch/Debian: `echo 1 > /proc/sys/kernel/unprivileged_userns_clone`
+- RHEL/CentOS 7: `echo 28633 > /proc/sys/user/max_user_namespaces`
+
+Run the following commands as an ordinary user:
 ```bash
 # Same as the first example
 mkdir ~/mycontainer

vendor/github.com/opencontainers/runc/libcontainer/cgroups/cgroups.go

@@ -37,8 +37,18 @@ type Manager interface {
 	// restore the object later.
 	GetPaths() map[string]string
 
+	// GetUnifiedPath returns the unified path when running in unified mode.
+	// The value corresponds to the all values of GetPaths() map.
+	//
+	// GetUnifiedPath returns error when running in hybrid mode as well as
+	// in legacy mode.
+	GetUnifiedPath() (string, error)
+
 	// Sets the cgroup as configured.
 	Set(container *configs.Config) error
+
+	// Gets the cgroup as configured.
+	GetCgroups() (*configs.Cgroup, error)
 }
 
 type NotFoundError struct {

vendor/github.com/opencontainers/runc/libcontainer/cgroups/utils.go

@@ -20,8 +20,9 @@ import (
 )
 
 const (
-	CgroupNamePrefix = "name="
-	CgroupProcesses  = "cgroup.procs"
+	CgroupNamePrefix  = "name="
+	CgroupProcesses   = "cgroup.procs"
+	unifiedMountpoint = "/sys/fs/cgroup"
 )
 
 var (
@@ -40,7 +41,7 @@ var HugePageSizeUnitList = []string{"B", "KB", "MB", "GB", "TB", "PB"}
 func IsCgroup2UnifiedMode() bool {
 	isUnifiedOnce.Do(func() {
 		var st syscall.Statfs_t
-		if err := syscall.Statfs("/sys/fs/cgroup", &st); err != nil {
+		if err := syscall.Statfs(unifiedMountpoint, &st); err != nil {
 			panic("cannot statfs cgroup root")
 		}
 		isUnified = st.Type == unix.CGROUP2_SUPER_MAGIC
@@ -50,6 +51,9 @@ func IsCgroup2UnifiedMode() bool {
 
 // https://www.kernel.org/doc/Documentation/cgroup-v1/cgroups.txt
 func FindCgroupMountpoint(cgroupPath, subsystem string) (string, error) {
+	if IsCgroup2UnifiedMode() {
+		return unifiedMountpoint, nil
+	}
 	mnt, _, err := FindCgroupMountpointAndRoot(cgroupPath, subsystem)
 	return mnt, err
 }
@@ -235,8 +239,8 @@ func GetCgroupMounts(all bool) ([]Mount, error) {
 			return nil, err
 		}
 		m := Mount{
-			Mountpoint: "/sys/fs/cgroup",
-			Root:       "/sys/fs/cgroup",
+			Mountpoint: unifiedMountpoint,
+			Root:       unifiedMountpoint,
 			Subsystems: availableControllers,
 		}
 		return []Mount{m}, nil
@@ -262,6 +266,21 @@ func GetCgroupMounts(all bool) ([]Mount, error) {
 
 // GetAllSubsystems returns all the cgroup subsystems supported by the kernel
 func GetAllSubsystems() ([]string, error) {
+	// /proc/cgroups is meaningless for v2
+	// https://github.com/torvalds/linux/blob/v5.3/Documentation/admin-guide/cgroup-v2.rst#deprecated-v1-core-features
+	if IsCgroup2UnifiedMode() {
+		// "pseudo" controllers do not appear in /sys/fs/cgroup/cgroup.controllers.
+		// - devices: implemented in kernel 4.15
+		// - freezer: implemented in kernel 5.2
+		// We assume these are always available, as it is hard to detect availability.
+		pseudo := []string{"devices", "freezer"}
+		data, err := ioutil.ReadFile("/sys/fs/cgroup/cgroup.controllers")
+		if err != nil {
+			return nil, err
+		}
+		subsystems := append(pseudo, strings.Fields(string(data))...)
+		return subsystems, nil
+	}
 	f, err := os.Open("/proc/cgroups")
 	if err != nil {
 		return nil, err

vendor/github.com/opencontainers/runc/vendor.conf

@@ -26,3 +26,6 @@ golang.org/x/sys                        9eafafc0a87e0fd0aeeba439a4573537970c44c7
 # console dependencies
 github.com/containerd/console           0650fd9eeb50bab4fc99dceb9f2e14cf58f36e7f
 github.com/pkg/errors                   ba968bfe8b2f7e042a574c888954fccecfa385b4 # v0.8.1
+
+# ebpf dependencies
+github.com/cilium/ebpf                  95b36a581eed7b0f127306ed1d16cc0ddc06cf67

vendor/github.com/opencontainers/selinux/go-selinux/label/label_selinux.go

@@ -13,11 +13,12 @@ import (
 
 // Valid Label Options
 var validOptions = map[string]bool{
-	"disable": true,
-	"type":    true,
-	"user":    true,
-	"role":    true,
-	"level":   true,
+	"disable":  true,
+	"type":     true,
+	"filetype": true,
+	"user":     true,
+	"role":     true,
+	"level":    true,
 }
 
 var ErrIncompatibleLabel = fmt.Errorf("Bad SELinux option z and Z can not be used together")
@@ -51,13 +52,16 @@ func InitLabels(options []string) (plabel string, mlabel string, Err error) {
 				return "", mountLabel, nil
 			}
 			if i := strings.Index(opt, ":"); i == -1 {
-				return "", "", fmt.Errorf("Bad label option %q, valid options 'disable' or \n'user, role, level, type' followed by ':' and a value", opt)
+				return "", "", fmt.Errorf("Bad label option %q, valid options 'disable' or \n'user, role, level, type, filetype' followed by ':' and a value", opt)
 			}
 			con := strings.SplitN(opt, ":", 2)
 			if !validOptions[con[0]] {
-				return "", "", fmt.Errorf("Bad label option %q, valid options 'disable, user, role, level, type'", con[0])
+				return "", "", fmt.Errorf("Bad label option %q, valid options 'disable, user, role, level, type, filetype'", con[0])
 
 			}
+			if con[0] == "filetype" {
+				mcon["type"] = con[1]
+			}
 			pcon[con[0]] = con[1]
 			if con[0] == "level" || con[0] == "user" {
 				mcon[con[0]] = con[1]

vendor/github.com/opencontainers/selinux/go-selinux/selinux_linux.go

@@ -18,6 +18,8 @@ import (
 	"strings"
 	"sync"
 	"syscall"
+
+	"golang.org/x/sys/unix"
 )
 
 const (
@@ -252,6 +254,12 @@ func getSELinuxPolicyRoot() string {
 	return filepath.Join(selinuxDir, readConfig(selinuxTypeTag))
 }
 
+func isProcHandle(fh *os.File) (bool, error) {
+	var buf unix.Statfs_t
+	err := unix.Fstatfs(int(fh.Fd()), &buf)
+	return buf.Type == unix.PROC_SUPER_MAGIC, err
+}
+
 func readCon(fpath string) (string, error) {
 	if fpath == "" {
 		return "", ErrEmptyPath
@@ -263,6 +271,12 @@ func readCon(fpath string) (string, error) {
 	}
 	defer in.Close()
 
+	if ok, err := isProcHandle(in); err != nil {
+		return "", err
+	} else if !ok {
+		return "", fmt.Errorf("%s not on procfs", fpath)
+	}
+
 	var retval string
 	if _, err := fmt.Fscanf(in, "%s", &retval); err != nil {
 		return "", err
@@ -345,6 +359,12 @@ func writeCon(fpath string, val string) error {
 	}
 	defer out.Close()
 
+	if ok, err := isProcHandle(out); err != nil {
+		return err
+	} else if !ok {
+		return fmt.Errorf("%s not on procfs", fpath)
+	}
+
 	if val != "" {
 		_, err = out.Write([]byte(val))
 	} else {
@@ -392,6 +412,14 @@ func SetExecLabel(label string) error {
 	return writeCon(fmt.Sprintf("/proc/self/task/%d/attr/exec", syscall.Gettid()), label)
 }
 
+/*
+SetTaskLabel sets the SELinux label for the current thread, or an error.
+This requires the dyntransition permission.
+*/
+func SetTaskLabel(label string) error {
+	return writeCon(fmt.Sprintf("/proc/self/task/%d/attr/current", syscall.Gettid()), label)
+}
+
 // SetSocketLabel takes a process label and tells the kernel to assign the
 // label to the next socket that gets created
 func SetSocketLabel(label string) error {
@@ -403,6 +431,11 @@ func SocketLabel() (string, error) {
 	return readCon(fmt.Sprintf("/proc/self/task/%d/attr/sockcreate", syscall.Gettid()))
 }
 
+// PeerLabel retrieves the label of the client on the other side of a socket
+func PeerLabel(fd uintptr) (string, error) {
+	return unix.GetsockoptString(int(fd), syscall.SOL_SOCKET, syscall.SO_PEERSEC)
+}
+
 // SetKeyLabel takes a process label and tells the kernel to assign the
 // label to the next kernel keyring that gets created
 func SetKeyLabel(label string) error {

vendor/github.com/opencontainers/selinux/go-selinux/selinux_stub.go

@@ -96,6 +96,14 @@ func SetExecLabel(label string) error {
 	return nil
 }
 
+/*
+SetTaskLabel sets the SELinux label for the current thread, or an error.
+This requires the dyntransition permission.
+*/
+func SetTaskLabel(label string) error {
+        return nil
+}
+
 /*
 SetSocketLabel sets the SELinux label that the kernel will use for any programs
 that are executed by the current process thread, or an error.
@@ -109,6 +117,11 @@ func SocketLabel() (string, error) {
 	return "", nil
 }
 
+// PeerLabel retrieves the label of the client on the other side of a socket
+func PeerLabel(fd uintptr) (string, error) {
+	return "", nil
+}
+
 // SetKeyLabel takes a process label and tells the kernel to assign the
 // label to the next kernel keyring that gets created
 func SetKeyLabel(label string) error {