diff --git a/pkg/server/service_unix.go b/pkg/server/service_unix.go
index 920fc00e5..44f43f8c4 100644
--- a/pkg/server/service_unix.go
+++ b/pkg/server/service_unix.go
@@ -19,8 +19,8 @@
 package server
 
 import (
+	"github.com/containerd/containerd/sys"
 	cni "github.com/containerd/go-cni"
-	runcsystem "github.com/opencontainers/runc/libcontainer/system"
 	"github.com/opencontainers/selinux/go-selinux"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
@@ -34,7 +34,7 @@ const networkAttachCount = 2
 func (c *criService) initPlatform() error {
 	var err error
 
-	if runcsystem.RunningInUserNS() {
+	if sys.RunningInUserNS() {
 		if !(c.config.DisableCgroup && !c.apparmorEnabled() && c.config.RestrictOOMScoreAdj) {
 			logrus.Warn("Running containerd in a user namespace typically requires disable_cgroup, disable_apparmor, restrict_oom_score_adj set to be true")
 		}
diff --git a/vendor/github.com/opencontainers/runc/libcontainer/system/linux.go b/vendor/github.com/opencontainers/runc/libcontainer/system/linux.go
deleted file mode 100644
index a4ae8901a..000000000
--- a/vendor/github.com/opencontainers/runc/libcontainer/system/linux.go
+++ /dev/null
@@ -1,155 +0,0 @@
-// +build linux
-
-package system
-
-import (
-	"os"
-	"os/exec"
-	"syscall" // only for exec
-	"unsafe"
-
-	"github.com/opencontainers/runc/libcontainer/user"
-	"golang.org/x/sys/unix"
-)
-
-// If arg2 is nonzero, set the "child subreaper" attribute of the
-// calling process; if arg2 is zero, unset the attribute.  When a
-// process is marked as a child subreaper, all of the children
-// that it creates, and their descendants, will be marked as
-// having a subreaper.  In effect, a subreaper fulfills the role
-// of init(1) for its descendant processes.  Upon termination of
-// a process that is orphaned (i.e., its immediate parent has
-// already terminated) and marked as having a subreaper, the
-// nearest still living ancestor subreaper will receive a SIGCHLD
-// signal and be able to wait(2) on the process to discover its
-// termination status.
-const PR_SET_CHILD_SUBREAPER = 36
-
-type ParentDeathSignal int
-
-func (p ParentDeathSignal) Restore() error {
-	if p == 0 {
-		return nil
-	}
-	current, err := GetParentDeathSignal()
-	if err != nil {
-		return err
-	}
-	if p == current {
-		return nil
-	}
-	return p.Set()
-}
-
-func (p ParentDeathSignal) Set() error {
-	return SetParentDeathSignal(uintptr(p))
-}
-
-func Execv(cmd string, args []string, env []string) error {
-	name, err := exec.LookPath(cmd)
-	if err != nil {
-		return err
-	}
-
-	return syscall.Exec(name, args, env)
-}
-
-func Prlimit(pid, resource int, limit unix.Rlimit) error {
-	_, _, err := unix.RawSyscall6(unix.SYS_PRLIMIT64, uintptr(pid), uintptr(resource), uintptr(unsafe.Pointer(&limit)), uintptr(unsafe.Pointer(&limit)), 0, 0)
-	if err != 0 {
-		return err
-	}
-	return nil
-}
-
-func SetParentDeathSignal(sig uintptr) error {
-	if err := unix.Prctl(unix.PR_SET_PDEATHSIG, sig, 0, 0, 0); err != nil {
-		return err
-	}
-	return nil
-}
-
-func GetParentDeathSignal() (ParentDeathSignal, error) {
-	var sig int
-	if err := unix.Prctl(unix.PR_GET_PDEATHSIG, uintptr(unsafe.Pointer(&sig)), 0, 0, 0); err != nil {
-		return -1, err
-	}
-	return ParentDeathSignal(sig), nil
-}
-
-func SetKeepCaps() error {
-	if err := unix.Prctl(unix.PR_SET_KEEPCAPS, 1, 0, 0, 0); err != nil {
-		return err
-	}
-
-	return nil
-}
-
-func ClearKeepCaps() error {
-	if err := unix.Prctl(unix.PR_SET_KEEPCAPS, 0, 0, 0, 0); err != nil {
-		return err
-	}
-
-	return nil
-}
-
-func Setctty() error {
-	if err := unix.IoctlSetInt(0, unix.TIOCSCTTY, 0); err != nil {
-		return err
-	}
-	return nil
-}
-
-// RunningInUserNS detects whether we are currently running in a user namespace.
-// Originally copied from github.com/lxc/lxd/shared/util.go
-func RunningInUserNS() bool {
-	uidmap, err := user.CurrentProcessUIDMap()
-	if err != nil {
-		// This kernel-provided file only exists if user namespaces are supported
-		return false
-	}
-	return UIDMapInUserNS(uidmap)
-}
-
-func UIDMapInUserNS(uidmap []user.IDMap) bool {
-	/*
-	 * We assume we are in the initial user namespace if we have a full
-	 * range - 4294967295 uids starting at uid 0.
-	 */
-	if len(uidmap) == 1 && uidmap[0].ID == 0 && uidmap[0].ParentID == 0 && uidmap[0].Count == 4294967295 {
-		return false
-	}
-	return true
-}
-
-// GetParentNSeuid returns the euid within the parent user namespace
-func GetParentNSeuid() int64 {
-	euid := int64(os.Geteuid())
-	uidmap, err := user.CurrentProcessUIDMap()
-	if err != nil {
-		// This kernel-provided file only exists if user namespaces are supported
-		return euid
-	}
-	for _, um := range uidmap {
-		if um.ID <= euid && euid <= um.ID+um.Count-1 {
-			return um.ParentID + euid - um.ID
-		}
-	}
-	return euid
-}
-
-// SetSubreaper sets the value i as the subreaper setting for the calling process
-func SetSubreaper(i int) error {
-	return unix.Prctl(PR_SET_CHILD_SUBREAPER, uintptr(i), 0, 0, 0)
-}
-
-// GetSubreaper returns the subreaper setting for the calling process
-func GetSubreaper() (int, error) {
-	var i uintptr
-
-	if err := unix.Prctl(unix.PR_GET_CHILD_SUBREAPER, uintptr(unsafe.Pointer(&i)), 0, 0, 0); err != nil {
-		return -1, err
-	}
-
-	return int(i), nil
-}
diff --git a/vendor/github.com/opencontainers/runc/libcontainer/system/proc.go b/vendor/github.com/opencontainers/runc/libcontainer/system/proc.go
deleted file mode 100644
index 79232a437..000000000
--- a/vendor/github.com/opencontainers/runc/libcontainer/system/proc.go
+++ /dev/null
@@ -1,113 +0,0 @@
-package system
-
-import (
-	"fmt"
-	"io/ioutil"
-	"path/filepath"
-	"strconv"
-	"strings"
-)
-
-// State is the status of a process.
-type State rune
-
-const ( // Only values for Linux 3.14 and later are listed here
-	Dead        State = 'X'
-	DiskSleep   State = 'D'
-	Running     State = 'R'
-	Sleeping    State = 'S'
-	Stopped     State = 'T'
-	TracingStop State = 't'
-	Zombie      State = 'Z'
-)
-
-// String forms of the state from proc(5)'s documentation for
-// /proc/[pid]/status' "State" field.
-func (s State) String() string {
-	switch s {
-	case Dead:
-		return "dead"
-	case DiskSleep:
-		return "disk sleep"
-	case Running:
-		return "running"
-	case Sleeping:
-		return "sleeping"
-	case Stopped:
-		return "stopped"
-	case TracingStop:
-		return "tracing stop"
-	case Zombie:
-		return "zombie"
-	default:
-		return fmt.Sprintf("unknown (%c)", s)
-	}
-}
-
-// Stat_t represents the information from /proc/[pid]/stat, as
-// described in proc(5) with names based on the /proc/[pid]/status
-// fields.
-type Stat_t struct {
-	// PID is the process ID.
-	PID uint
-
-	// Name is the command run by the process.
-	Name string
-
-	// State is the state of the process.
-	State State
-
-	// StartTime is the number of clock ticks after system boot (since
-	// Linux 2.6).
-	StartTime uint64
-}
-
-// Stat returns a Stat_t instance for the specified process.
-func Stat(pid int) (stat Stat_t, err error) {
-	bytes, err := ioutil.ReadFile(filepath.Join("/proc", strconv.Itoa(pid), "stat"))
-	if err != nil {
-		return stat, err
-	}
-	return parseStat(string(bytes))
-}
-
-// GetProcessStartTime is deprecated.  Use Stat(pid) and
-// Stat_t.StartTime instead.
-func GetProcessStartTime(pid int) (string, error) {
-	stat, err := Stat(pid)
-	if err != nil {
-		return "", err
-	}
-	return fmt.Sprintf("%d", stat.StartTime), nil
-}
-
-func parseStat(data string) (stat Stat_t, err error) {
-	// From proc(5), field 2 could contain space and is inside `(` and `)`.
-	// The following is an example:
-	// 89653 (gunicorn: maste) S 89630 89653 89653 0 -1 4194560 29689 28896 0 3 146 32 76 19 20 0 1 0 2971844 52965376 3920 18446744073709551615 1 1 0 0 0 0 0 16781312 137447943 0 0 0 17 1 0 0 0 0 0 0 0 0 0 0 0 0 0
-	i := strings.LastIndex(data, ")")
-	if i <= 2 || i >= len(data)-1 {
-		return stat, fmt.Errorf("invalid stat data: %q", data)
-	}
-
-	parts := strings.SplitN(data[:i], "(", 2)
-	if len(parts) != 2 {
-		return stat, fmt.Errorf("invalid stat data: %q", data)
-	}
-
-	stat.Name = parts[1]
-	_, err = fmt.Sscanf(parts[0], "%d", &stat.PID)
-	if err != nil {
-		return stat, err
-	}
-
-	// parts indexes should be offset by 3 from the field number given
-	// proc(5), because parts is zero-indexed and we've removed fields
-	// one (PID) and two (Name) in the paren-split.
-	parts = strings.Split(data[i+2:], " ")
-	var state int
-	fmt.Sscanf(parts[3-3], "%c", &state)
-	stat.State = State(state)
-	fmt.Sscanf(parts[22-3], "%d", &stat.StartTime)
-	return stat, nil
-}
diff --git a/vendor/github.com/opencontainers/runc/libcontainer/system/syscall_linux_32.go b/vendor/github.com/opencontainers/runc/libcontainer/system/syscall_linux_32.go
deleted file mode 100644
index c5ca5d862..000000000
--- a/vendor/github.com/opencontainers/runc/libcontainer/system/syscall_linux_32.go
+++ /dev/null
@@ -1,26 +0,0 @@
-// +build linux
-// +build 386 arm
-
-package system
-
-import (
-	"golang.org/x/sys/unix"
-)
-
-// Setuid sets the uid of the calling thread to the specified uid.
-func Setuid(uid int) (err error) {
-	_, _, e1 := unix.RawSyscall(unix.SYS_SETUID32, uintptr(uid), 0, 0)
-	if e1 != 0 {
-		err = e1
-	}
-	return
-}
-
-// Setgid sets the gid of the calling thread to the specified gid.
-func Setgid(gid int) (err error) {
-	_, _, e1 := unix.RawSyscall(unix.SYS_SETGID32, uintptr(gid), 0, 0)
-	if e1 != 0 {
-		err = e1
-	}
-	return
-}
diff --git a/vendor/github.com/opencontainers/runc/libcontainer/system/syscall_linux_64.go b/vendor/github.com/opencontainers/runc/libcontainer/system/syscall_linux_64.go
deleted file mode 100644
index e05e30adc..000000000
--- a/vendor/github.com/opencontainers/runc/libcontainer/system/syscall_linux_64.go
+++ /dev/null
@@ -1,26 +0,0 @@
-// +build linux
-// +build arm64 amd64 mips mipsle mips64 mips64le ppc ppc64 ppc64le riscv64 s390x
-
-package system
-
-import (
-	"golang.org/x/sys/unix"
-)
-
-// Setuid sets the uid of the calling thread to the specified uid.
-func Setuid(uid int) (err error) {
-	_, _, e1 := unix.RawSyscall(unix.SYS_SETUID, uintptr(uid), 0, 0)
-	if e1 != 0 {
-		err = e1
-	}
-	return
-}
-
-// Setgid sets the gid of the calling thread to the specified gid.
-func Setgid(gid int) (err error) {
-	_, _, e1 := unix.RawSyscall(unix.SYS_SETGID, uintptr(gid), 0, 0)
-	if e1 != 0 {
-		err = e1
-	}
-	return
-}
diff --git a/vendor/github.com/opencontainers/runc/libcontainer/system/sysconfig.go b/vendor/github.com/opencontainers/runc/libcontainer/system/sysconfig.go
deleted file mode 100644
index b8434f105..000000000
--- a/vendor/github.com/opencontainers/runc/libcontainer/system/sysconfig.go
+++ /dev/null
@@ -1,12 +0,0 @@
-// +build cgo,linux
-
-package system
-
-/*
-#include <unistd.h>
-*/
-import "C"
-
-func GetClockTicks() int {
-	return int(C.sysconf(C._SC_CLK_TCK))
-}
diff --git a/vendor/github.com/opencontainers/runc/libcontainer/system/sysconfig_notcgo.go b/vendor/github.com/opencontainers/runc/libcontainer/system/sysconfig_notcgo.go
deleted file mode 100644
index d93b5d5fd..000000000
--- a/vendor/github.com/opencontainers/runc/libcontainer/system/sysconfig_notcgo.go
+++ /dev/null
@@ -1,15 +0,0 @@
-// +build !cgo windows
-
-package system
-
-func GetClockTicks() int {
-	// TODO figure out a better alternative for platforms where we're missing cgo
-	//
-	// TODO Windows. This could be implemented using Win32 QueryPerformanceFrequency().
-	// https://msdn.microsoft.com/en-us/library/windows/desktop/ms644905(v=vs.85).aspx
-	//
-	// An example of its usage can be found here.
-	// https://msdn.microsoft.com/en-us/library/windows/desktop/dn553408(v=vs.85).aspx
-
-	return 100
-}
diff --git a/vendor/github.com/opencontainers/runc/libcontainer/system/unsupported.go b/vendor/github.com/opencontainers/runc/libcontainer/system/unsupported.go
deleted file mode 100644
index b94be74a6..000000000
--- a/vendor/github.com/opencontainers/runc/libcontainer/system/unsupported.go
+++ /dev/null
@@ -1,27 +0,0 @@
-// +build !linux
-
-package system
-
-import (
-	"os"
-
-	"github.com/opencontainers/runc/libcontainer/user"
-)
-
-// RunningInUserNS is a stub for non-Linux systems
-// Always returns false
-func RunningInUserNS() bool {
-	return false
-}
-
-// UIDMapInUserNS is a stub for non-Linux systems
-// Always returns false
-func UIDMapInUserNS(uidmap []user.IDMap) bool {
-	return false
-}
-
-// GetParentNSeuid returns the euid within the parent user namespace
-// Always returns os.Geteuid on non-linux
-func GetParentNSeuid() int {
-	return os.Geteuid()
-}
diff --git a/vendor/github.com/opencontainers/runc/libcontainer/system/xattrs_linux.go b/vendor/github.com/opencontainers/runc/libcontainer/system/xattrs_linux.go
deleted file mode 100644
index a6823fc99..000000000
--- a/vendor/github.com/opencontainers/runc/libcontainer/system/xattrs_linux.go
+++ /dev/null
@@ -1,35 +0,0 @@
-package system
-
-import "golang.org/x/sys/unix"
-
-// Returns a []byte slice if the xattr is set and nil otherwise
-// Requires path and its attribute as arguments
-func Lgetxattr(path string, attr string) ([]byte, error) {
-	var sz int
-	// Start with a 128 length byte array
-	dest := make([]byte, 128)
-	sz, errno := unix.Lgetxattr(path, attr, dest)
-
-	switch {
-	case errno == unix.ENODATA:
-		return nil, errno
-	case errno == unix.ENOTSUP:
-		return nil, errno
-	case errno == unix.ERANGE:
-		// 128 byte array might just not be good enough,
-		// A dummy buffer is used to get the real size
-		// of the xattrs on disk
-		sz, errno = unix.Lgetxattr(path, attr, []byte{})
-		if errno != nil {
-			return nil, errno
-		}
-		dest = make([]byte, sz)
-		sz, errno = unix.Lgetxattr(path, attr, dest)
-		if errno != nil {
-			return nil, errno
-		}
-	case errno != nil:
-		return nil, errno
-	}
-	return dest[:sz], nil
-}