Merge pull request #8659 from containers/dependabot/go_modules/github.com/opencontainers/selinux-1.7.0

Bump github.com/opencontainers/selinux from 1.6.0 to 1.7.0

14 files changed, 315 insertions, 292 deletions

diff --git a/go.mod b/go.mod
index f0efee277..a4a3df590 100644
--- a/go.mod
+++ b/go.mod
@@ -45,7 +45,7 @@ require (
 	github.com/opencontainers/runc v1.0.0-rc91.0.20200708210054-ce54a9d4d79b
 	github.com/opencontainers/runtime-spec v1.0.3-0.20200817204227-f9c09b4ea1df
 	github.com/opencontainers/runtime-tools v0.9.0
-	github.com/opencontainers/selinux v1.6.0
+	github.com/opencontainers/selinux v1.7.0
 	github.com/opentracing/opentracing-go v1.2.0
 	github.com/pkg/errors v0.9.1
 	github.com/pmezard/go-difflib v1.0.0
diff --git a/go.sum b/go.sum
index 8aa9197ae..806ebaaa1 100644
--- a/go.sum
+++ b/go.sum
@@ -439,6 +439,8 @@ github.com/opencontainers/runtime-tools v0.9.0/go.mod h1:r3f7wjNzSs2extwzU3Y+6pK
 github.com/opencontainers/selinux v1.5.1/go.mod h1:yTcKuYAh6R95iDpefGLQaPaRwJFwyzAJufJyiTt7s0g=
 github.com/opencontainers/selinux v1.6.0 h1:+bIAS/Za3q5FTwWym4fTB0vObnfCf3G/NC7K6Jx62mY=
 github.com/opencontainers/selinux v1.6.0/go.mod h1:VVGKuOLlE7v4PJyT6h7mNWvq1rzqiriPsEqVhc+svHE=
+github.com/opencontainers/selinux v1.7.0 h1:I3Qiu8dbuWHHHfwd4id7zXivJ1qWixGQx8nTvQsKnjs=
+github.com/opencontainers/selinux v1.7.0/go.mod h1:RScLhm78qiWa2gbVCcGkC7tCGdgk3ogry1nUQF8Evvo=
 github.com/openshift/imagebuilder v1.1.8 h1:gjiIl8pbNj0eC4XWvFJHATdDvYm64p9/pLDLQWoLZPA=
 github.com/openshift/imagebuilder v1.1.8/go.mod h1:9aJRczxCH0mvT6XQ+5STAQaPWz7OsWcU5/mRkt8IWeo=
 github.com/opentracing/opentracing-go v1.2.0 h1:uEJPy/1a5RIPAJ0Ov+OIO8OxWu77jEv+1B0VhjKrZUs=
@@ -558,6 +560,8 @@ github.com/vishvananda/netns v0.0.0-20191106174202-0a2b9b5464df h1:OviZH7qLw/7Zo
 github.com/vishvananda/netns v0.0.0-20191106174202-0a2b9b5464df/go.mod h1:JP3t17pCcGlemwknint6hfoeCVQrEMVwxRLRjXpq+BU=
 github.com/willf/bitset v1.1.11-0.20200630133818-d5bec3311243 h1:R43TdZy32XXSXjJn7M/HhALJ9imq6ztLnChfYJpVDnM=
 github.com/willf/bitset v1.1.11-0.20200630133818-d5bec3311243/go.mod h1:RjeCKbqT1RxIR/KWY6phxZiaY1IyutSBfGjNPySAYV4=
+github.com/willf/bitset v1.1.11 h1:N7Z7E9UvjW+sGsEl7k/SJrvY2reP1A07MrGuCjIOjRE=
+github.com/willf/bitset v1.1.11/go.mod h1:83CECat5yLh5zVOf4P1ErAgKA5UDvKtgyUABdr3+MjI=
 github.com/xeipuuv/gojsonpointer v0.0.0-20180127040702-4e3ac2762d5f/go.mod h1:N2zxlSyiKSe5eX1tZViRH5QA0qijqEDrYZiPEAiq3wU=
 github.com/xeipuuv/gojsonpointer v0.0.0-20190809123943-df4f5c81cb3b h1:6cLsL+2FW6dRAdl5iMtHgRogVCff0QpRi9653YmdcJA=
 github.com/xeipuuv/gojsonpointer v0.0.0-20190809123943-df4f5c81cb3b/go.mod h1:N2zxlSyiKSe5eX1tZViRH5QA0qijqEDrYZiPEAiq3wU=
diff --git a/vendor/github.com/opencontainers/selinux/go-selinux/label/label_selinux.go b/vendor/github.com/opencontainers/selinux/go-selinux/label/label_selinux.go
index 10ac15a85..988adc8f4 100644
--- a/vendor/github.com/opencontainers/selinux/go-selinux/label/label_selinux.go
+++ b/vendor/github.com/opencontainers/selinux/go-selinux/label/label_selinux.go
@@ -27,14 +27,14 @@ var ErrIncompatibleLabel = errors.New("Bad SELinux option z and Z can not be use
 // the container.  A list of options can be passed into this function to alter
 // the labels.  The labels returned will include a random MCS String, that is
 // guaranteed to be unique.
-func InitLabels(options []string) (plabel string, mlabel string, Err error) {
+func InitLabels(options []string) (plabel string, mlabel string, retErr error) {
 	if !selinux.GetEnabled() {
 		return "", "", nil
 	}
 	processLabel, mountLabel := selinux.ContainerLabels()
 	if processLabel != "" {
 		defer func() {
-			if Err != nil {
+			if retErr != nil {
 				selinux.ReleaseLabel(mountLabel)
 			}
 		}()
@@ -57,7 +57,6 @@ func InitLabels(options []string) (plabel string, mlabel string, Err error) {
 			con := strings.SplitN(opt, ":", 2)
 			if !validOptions[con[0]] {
 				return "", "", errors.Errorf("Bad label option %q, valid options 'disable, user, role, level, type, filetype'", con[0])
-
 			}
 			if con[0] == "filetype" {
 				mcon["type"] = con[1]
diff --git a/vendor/github.com/opencontainers/selinux/go-selinux/selinux.go b/vendor/github.com/opencontainers/selinux/go-selinux/selinux.go
index 50760dc93..d9119908b 100644
--- a/vendor/github.com/opencontainers/selinux/go-selinux/selinux.go
+++ b/vendor/github.com/opencontainers/selinux/go-selinux/selinux.go
@@ -30,6 +30,11 @@ var (
 	// ErrLevelSyntax is returned when a sensitivity or category do not have correct syntax in a level
 	ErrLevelSyntax = errors.New("invalid level syntax")
 
+	// ErrContextMissing is returned if a requested context is not found in a file.
+	ErrContextMissing = errors.New("context does not have a match")
+	// ErrVerifierNil is returned when a context verifier function is nil.
+	ErrVerifierNil = errors.New("verifier function is nil")
+
 	// CategoryRange allows the upper bound on the category range to be adjusted
 	CategoryRange = DefaultCategoryRange
 )
@@ -63,8 +68,12 @@ func FileLabel(fpath string) (string, error) {
 	return fileLabel(fpath)
 }
 
-// SetFSCreateLabel tells kernel the label to create all file system objects
-// created by this task. Setting label="" to return to default.
+// SetFSCreateLabel tells the kernel what label to use for all file system objects
+// created by this task.
+// Set the label to an empty string to return to the default label. Calls to SetFSCreateLabel
+// should be wrapped in runtime.LockOSThread()/runtime.UnlockOSThread() until file system
+// objects created by this task are finished to guarantee another goroutine does not migrate
+// to the current thread before execution is complete.
 func SetFSCreateLabel(label string) error {
 	return setFSCreateLabel(label)
 }
@@ -113,19 +122,27 @@ func CalculateGlbLub(sourceRange, targetRange string) (string, error) {
 }
 
 // SetExecLabel sets the SELinux label that the kernel will use for any programs
-// that are executed by the current process thread, or an error.
+// that are executed by the current process thread, or an error. Calls to SetExecLabel
+// should  be wrapped in runtime.LockOSThread()/runtime.UnlockOSThread() until execution
+// of the program is finished to guarantee another goroutine does not migrate to the current
+// thread before execution is complete.
 func SetExecLabel(label string) error {
 	return setExecLabel(label)
 }
 
 // SetTaskLabel sets the SELinux label for the current thread, or an error.
-// This requires the dyntransition permission.
+// This requires the dyntransition permission. Calls to SetTaskLabel should
+// be wrapped in runtime.LockOSThread()/runtime.UnlockOSThread() to guarantee
+// the current thread does not run in a new mislabeled thread.
 func SetTaskLabel(label string) error {
 	return setTaskLabel(label)
 }
 
 // SetSocketLabel takes a process label and tells the kernel to assign the
-// label to the next socket that gets created
+// label to the next socket that gets created. Calls to SetSocketLabel
+// should be wrapped in runtime.LockOSThread()/runtime.UnlockOSThread() until
+// the the socket is created to guarantee another goroutine does not migrate
+// to the current thread before execution is complete.
 func SetSocketLabel(label string) error {
 	return setSocketLabel(label)
 }
@@ -141,7 +158,10 @@ func PeerLabel(fd uintptr) (string, error) {
 }
 
 // SetKeyLabel takes a process label and tells the kernel to assign the
-// label to the next kernel keyring that gets created
+// label to the next kernel keyring that gets created. Calls to SetKeyLabel
+// should be wrapped in runtime.LockOSThread()/runtime.UnlockOSThread() until
+// the kernel keyring is created to guarantee another goroutine does not migrate
+// to the current thread before execution is complete.
 func SetKeyLabel(label string) error {
 	return setKeyLabel(label)
 }
@@ -247,3 +267,12 @@ func DupSecOpt(src string) ([]string, error) {
 func DisableSecOpt() []string {
 	return disableSecOpt()
 }
+
+// GetDefaultContextWithLevel gets a single context for the specified SELinux user
+// identity that is reachable from the specified scon context. The context is based
+// on the per-user /etc/selinux/{SELINUXTYPE}/contexts/users/<username> if it exists,
+// and falls back to the global /etc/selinux/{SELINUXTYPE}/contexts/default_contexts
+// file.
+func GetDefaultContextWithLevel(user, level, scon string) (string, error) {
+	return getDefaultContextWithLevel(user, level, scon)
+}
diff --git a/vendor/github.com/opencontainers/selinux/go-selinux/selinux_linux.go b/vendor/github.com/opencontainers/selinux/go-selinux/selinux_linux.go
index d6b0d49db..904f5b04f 100644
--- a/vendor/github.com/opencontainers/selinux/go-selinux/selinux_linux.go
+++ b/vendor/github.com/opencontainers/selinux/go-selinux/selinux_linux.go
@@ -28,6 +28,8 @@ const (
 	minSensLen       = 2
 	contextFile      = "/usr/share/containers/selinux/contexts"
 	selinuxDir       = "/etc/selinux/"
+	selinuxUsersDir  = "contexts/users"
+	defaultContexts  = "contexts/default_contexts"
 	selinuxConfig    = selinuxDir + "config"
 	selinuxfsMount   = "/sys/fs/selinux"
 	selinuxTypeTag   = "SELINUXTYPE"
@@ -35,6 +37,8 @@ const (
 	xattrNameSelinux = "security.selinux"
 )
 
+var policyRoot = filepath.Join(selinuxDir, readConfig(selinuxTypeTag))
+
 type selinuxState struct {
 	enabledSet    bool
 	enabled       bool
@@ -54,6 +58,13 @@ type mlsRange struct {
 	high *level
 }
 
+type defaultSECtx struct {
+	user, level, scon   string
+	userRdr, defaultRdr io.Reader
+
+	verifier func(string) error
+}
+
 type levelItem byte
 
 const (
@@ -111,7 +122,7 @@ func verifySELinuxfsMount(mnt string) bool {
 		if err == nil {
 			break
 		}
-		if err == unix.EAGAIN {
+		if err == unix.EAGAIN || err == unix.EINTR {
 			continue
 		}
 		return false
@@ -205,28 +216,16 @@ func getEnabled() bool {
 }
 
 func readConfig(target string) string {
-	var (
-		val, key string
-		bufin    *bufio.Reader
-	)
-
 	in, err := os.Open(selinuxConfig)
 	if err != nil {
 		return ""
 	}
 	defer in.Close()
 
-	bufin = bufio.NewReader(in)
+	scanner := bufio.NewScanner(in)
 
-	for done := false; !done; {
-		var line string
-		if line, err = bufin.ReadString('\n'); err != nil {
-			if err != io.EOF {
-				return ""
-			}
-			done = true
-		}
-		line = strings.TrimSpace(line)
+	for scanner.Scan() {
+		line := strings.TrimSpace(scanner.Text())
 		if len(line) == 0 {
 			// Skip blank lines
 			continue
@@ -236,7 +235,7 @@ func readConfig(target string) string {
 			continue
 		}
 		if groups := assignRegex.FindStringSubmatch(line); groups != nil {
-			key, val = strings.TrimSpace(groups[1]), strings.TrimSpace(groups[2])
+			key, val := strings.TrimSpace(groups[1]), strings.TrimSpace(groups[2])
 			if key == target {
 				return strings.Trim(val, "\"")
 			}
@@ -245,15 +244,17 @@ func readConfig(target string) string {
 	return ""
 }
 
-func getSELinuxPolicyRoot() string {
-	return filepath.Join(selinuxDir, readConfig(selinuxTypeTag))
-}
-
 func isProcHandle(fh *os.File) error {
 	var buf unix.Statfs_t
-	err := unix.Fstatfs(int(fh.Fd()), &buf)
-	if err != nil {
-		return errors.Wrapf(err, "statfs(%q) failed", fh.Name())
+
+	for {
+		err := unix.Fstatfs(int(fh.Fd()), &buf)
+		if err == nil {
+			break
+		}
+		if err != unix.EINTR {
+			return errors.Wrapf(err, "statfs(%q) failed", fh.Name())
+		}
 	}
 	if buf.Type != unix.PROC_SUPER_MAGIC {
 		return errors.Errorf("file %q is not on procfs", fh.Name())
@@ -307,9 +308,16 @@ func setFileLabel(fpath string, label string) error {
 	if fpath == "" {
 		return ErrEmptyPath
 	}
-	if err := unix.Lsetxattr(fpath, xattrNameSelinux, []byte(label), 0); err != nil {
-		return errors.Wrapf(err, "failed to set file label on %s", fpath)
+	for {
+		err := unix.Lsetxattr(fpath, xattrNameSelinux, []byte(label), 0)
+		if err == nil {
+			break
+		}
+		if err != unix.EINTR {
+			return errors.Wrapf(err, "failed to set file label on %s", fpath)
+		}
 	}
+
 	return nil
 }
 
@@ -751,7 +759,7 @@ func reserveLabel(label string) {
 	if len(label) != 0 {
 		con := strings.SplitN(label, ":", 4)
 		if len(con) > 3 {
-			mcsAdd(con[3])
+			_ = mcsAdd(con[3])
 		}
 	}
 }
@@ -828,11 +836,11 @@ func intToMcs(id int, catRange uint32) string {
 	}
 
 	for ORD > TIER {
-		ORD = ORD - TIER
+		ORD -= TIER
 		TIER--
 	}
 	TIER = SETSIZE - TIER
-	ORD = ORD + TIER
+	ORD += TIER
 	return fmt.Sprintf("s0:c%d,c%d", TIER, ORD)
 }
 
@@ -844,16 +852,14 @@ func uniqMcs(catRange uint32) string {
 	)
 
 	for {
-		binary.Read(rand.Reader, binary.LittleEndian, &n)
+		_ = binary.Read(rand.Reader, binary.LittleEndian, &n)
 		c1 = n % catRange
-		binary.Read(rand.Reader, binary.LittleEndian, &n)
+		_ = binary.Read(rand.Reader, binary.LittleEndian, &n)
 		c2 = n % catRange
 		if c1 == c2 {
 			continue
-		} else {
-			if c1 > c2 {
-				c1, c2 = c2, c1
-			}
+		} else if c1 > c2 {
+			c1, c2 = c2, c1
 		}
 		mcs = fmt.Sprintf("s0:c%d,c%d", c1, c2)
 		if err := mcsAdd(mcs); err != nil {
@@ -884,18 +890,13 @@ func openContextFile() (*os.File, error) {
 	if f, err := os.Open(contextFile); err == nil {
 		return f, nil
 	}
-	lxcPath := filepath.Join(getSELinuxPolicyRoot(), "/contexts/lxc_contexts")
+	lxcPath := filepath.Join(policyRoot, "/contexts/lxc_contexts")
 	return os.Open(lxcPath)
 }
 
 var labels = loadLabels()
 
 func loadLabels() map[string]string {
-	var (
-		val, key string
-		bufin    *bufio.Reader
-	)
-
 	labels := make(map[string]string)
 	in, err := openContextFile()
 	if err != nil {
@@ -903,18 +904,10 @@ func loadLabels() map[string]string {
 	}
 	defer in.Close()
 
-	bufin = bufio.NewReader(in)
+	scanner := bufio.NewScanner(in)
 
-	for done := false; !done; {
-		var line string
-		if line, err = bufin.ReadString('\n'); err != nil {
-			if err == io.EOF {
-				done = true
-			} else {
-				break
-			}
-		}
-		line = strings.TrimSpace(line)
+	for scanner.Scan() {
+		line := strings.TrimSpace(scanner.Text())
 		if len(line) == 0 {
 			// Skip blank lines
 			continue
@@ -924,7 +917,7 @@ func loadLabels() map[string]string {
 			continue
 		}
 		if groups := assignRegex.FindStringSubmatch(line); groups != nil {
-			key, val = strings.TrimSpace(groups[1]), strings.TrimSpace(groups[2])
+			key, val := strings.TrimSpace(groups[1]), strings.TrimSpace(groups[2])
 			labels[key] = strings.Trim(val, "\"")
 		}
 	}
@@ -1015,7 +1008,7 @@ func copyLevel(src, dest string) (string, error) {
 		return "", err
 	}
 	mcsDelete(tcon["level"])
-	mcsAdd(scon["level"])
+	_ = mcsAdd(scon["level"])
 	tcon["level"] = scon["level"]
 	return tcon.Get(), nil
 }
@@ -1095,3 +1088,124 @@ func dupSecOpt(src string) ([]string, error) {
 func disableSecOpt() []string {
 	return []string{"disable"}
 }
+
+// findUserInContext scans the reader for a valid SELinux context
+// match that is verified with the verifier. Invalid contexts are
+// skipped. It returns a matched context or an empty string if no
+// match is found. If a scanner error occurs, it is returned.
+func findUserInContext(context Context, r io.Reader, verifier func(string) error) (string, error) {
+	fromRole := context["role"]
+	fromType := context["type"]
+	scanner := bufio.NewScanner(r)
+
+	for scanner.Scan() {
+		fromConns := strings.Fields(scanner.Text())
+		if len(fromConns) == 0 {
+			// Skip blank lines
+			continue
+		}
+
+		line := fromConns[0]
+
+		if line[0] == ';' || line[0] == '#' {
+			// Skip comments
+			continue
+		}
+
+		// user context files contexts are formatted as
+		// role_r:type_t:s0 where the user is missing.
+		lineArr := strings.SplitN(line, ":", 4)
+		// skip context with typo, or role and type do not match
+		if len(lineArr) != 3 ||
+			lineArr[0] != fromRole ||
+			lineArr[1] != fromType {
+			continue
+		}
+
+		for _, cc := range fromConns[1:] {
+			toConns := strings.SplitN(cc, ":", 4)
+			if len(toConns) != 3 {
+				continue
+			}
+
+			context["role"] = toConns[0]
+			context["type"] = toConns[1]
+
+			outConn := context.get()
+			if err := verifier(outConn); err != nil {
+				continue
+			}
+
+			return outConn, nil
+		}
+	}
+
+	if err := scanner.Err(); err != nil {
+		return "", errors.Wrap(err, "failed to scan for context")
+	}
+
+	return "", nil
+}
+
+func getDefaultContextFromReaders(c *defaultSECtx) (string, error) {
+	if c.verifier == nil {
+		return "", ErrVerifierNil
+	}
+
+	context, err := newContext(c.scon)
+	if err != nil {
+		return "", errors.Wrapf(err, "failed to create label for %s", c.scon)
+	}
+
+	// set so the verifier validates the matched context with the provided user and level.
+	context["user"] = c.user
+	context["level"] = c.level
+
+	conn, err := findUserInContext(context, c.userRdr, c.verifier)
+	if err != nil {
+		return "", err
+	}
+
+	if conn != "" {
+		return conn, nil
+	}
+
+	conn, err = findUserInContext(context, c.defaultRdr, c.verifier)
+	if err != nil {
+		return "", err
+	}
+
+	if conn != "" {
+		return conn, nil
+	}
+
+	return "", errors.Wrapf(ErrContextMissing, "context not found: %q", c.scon)
+}
+
+func getDefaultContextWithLevel(user, level, scon string) (string, error) {
+	userPath := filepath.Join(policyRoot, selinuxUsersDir, user)
+	defaultPath := filepath.Join(policyRoot, defaultContexts)
+
+	fu, err := os.Open(userPath)
+	if err != nil {
+		return "", err
+	}
+	defer fu.Close()
+
+	fd, err := os.Open(defaultPath)
+	if err != nil {
+		return "", err
+	}
+	defer fd.Close()
+
+	c := defaultSECtx{
+		user:       user,
+		level:      level,
+		scon:       scon,
+		userRdr:    fu,
+		defaultRdr: fd,
+		verifier:   securityCheckContext,
+	}
+
+	return getDefaultContextFromReaders(&c)
+}
diff --git a/vendor/github.com/opencontainers/selinux/go-selinux/selinux_stub.go b/vendor/github.com/opencontainers/selinux/go-selinux/selinux_stub.go
index c526b210f..e4b65c9e2 100644
--- a/vendor/github.com/opencontainers/selinux/go-selinux/selinux_stub.go
+++ b/vendor/github.com/opencontainers/selinux/go-selinux/selinux_stub.go
@@ -146,3 +146,7 @@ func dupSecOpt(src string) ([]string, error) {
 func disableSecOpt() []string {
 	return []string{"disable"}
 }
+
+func getDefaultContextWithLevel(user, level, scon string) (string, error) {
+	return "", nil
+}
diff --git a/vendor/github.com/opencontainers/selinux/go-selinux/xattrs.go b/vendor/github.com/opencontainers/selinux/go-selinux/xattrs.go
index de5c80ef3..2365b4bda 100644
--- a/vendor/github.com/opencontainers/selinux/go-selinux/xattrs.go
+++ b/vendor/github.com/opencontainers/selinux/go-selinux/xattrs.go
@@ -6,21 +6,21 @@ 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) {
+// lgetxattr returns a []byte slice containing the value of
+// an extended attribute attr set for path.
+func lgetxattr(path, attr string) ([]byte, error) {
 	// Start with a 128 length byte array
 	dest := make([]byte, 128)
-	sz, errno := unix.Lgetxattr(path, attr, dest)
+	sz, errno := doLgetxattr(path, attr, dest)
 	for errno == unix.ERANGE {
 		// Buffer too small, use zero-sized buffer to get the actual size
-		sz, errno = unix.Lgetxattr(path, attr, []byte{})
+		sz, errno = doLgetxattr(path, attr, []byte{})
 		if errno != nil {
 			return nil, errno
 		}
 
 		dest = make([]byte, sz)
-		sz, errno = unix.Lgetxattr(path, attr, dest)
+		sz, errno = doLgetxattr(path, attr, dest)
 	}
 	if errno != nil {
 		return nil, errno
@@ -28,3 +28,13 @@ func lgetxattr(path string, attr string) ([]byte, error) {
 
 	return dest[:sz], nil
 }
+
+// doLgetxattr is a wrapper that retries on EINTR
+func doLgetxattr(path, attr string, dest []byte) (int, error) {
+	for {
+		sz, err := unix.Lgetxattr(path, attr, dest)
+		if err != unix.EINTR {
+			return sz, err
+		}
+	}
+}
diff --git a/vendor/github.com/opencontainers/selinux/pkg/pwalk/pwalk.go b/vendor/github.com/opencontainers/selinux/pkg/pwalk/pwalk.go
index 63fde1842..437b12b3e 100644
--- a/vendor/github.com/opencontainers/selinux/pkg/pwalk/pwalk.go
+++ b/vendor/github.com/opencontainers/selinux/pkg/pwalk/pwalk.go
@@ -20,17 +20,16 @@ type WalkFunc = filepath.WalkFunc
 //
 // Note that this implementation only supports primitive error handling:
 //
-// * no errors are ever passed to WalkFn
+// - no errors are ever passed to WalkFn;
 //
-// * once a walkFn returns any error, all further processing stops
-//   and the error is returned to the caller of Walk;
+// - once a walkFn returns any error, all further processing stops
+// and the error is returned to the caller of Walk;
 //
-// * filepath.SkipDir is not supported;
-//
-// * if more than one walkFn instance will return an error, only one
-//   of such errors will be propagated and returned by Walk, others
-//   will be silently discarded.
+// - filepath.SkipDir is not supported;
 //
+// - if more than one walkFn instance will return an error, only one
+// of such errors will be propagated and returned by Walk, others
+// will be silently discarded.
 func Walk(root string, walkFn WalkFunc) error {
 	return WalkN(root, walkFn, runtime.NumCPU()*2)
 }
@@ -38,6 +37,8 @@ func Walk(root string, walkFn WalkFunc) error {
 // WalkN is a wrapper for filepath.Walk which can call multiple walkFn
 // in parallel, allowing to handle each item concurrently. A maximum of
 // num walkFn will be called at any one time.
+//
+// Please see Walk documentation for caveats of using this function.
 func WalkN(root string, walkFn WalkFunc, num int) error {
 	// make sure limit is sensible
 	if num < 1 {
diff --git a/vendor/github.com/willf/bitset/Makefile b/vendor/github.com/willf/bitset/Makefile
deleted file mode 100644
index db8377106..000000000
--- a/vendor/github.com/willf/bitset/Makefile
+++ /dev/null
@@ -1,191 +0,0 @@
-# MAKEFILE
-#
-# @author      Nicola Asuni <info@tecnick.com>
-# @link        https://github.com/willf/bitset
-# ------------------------------------------------------------------------------
-
-# List special make targets that are not associated with files
-.PHONY: help all test format fmtcheck vet lint coverage cyclo ineffassign misspell structcheck varcheck errcheck gosimple astscan qa deps clean nuke
-
-# Use bash as shell (Note: Ubuntu now uses dash which doesn't support PIPESTATUS).
-SHELL=/bin/bash
-
-# CVS path (path to the parent dir containing the project)
-CVSPATH=github.com/willf
-
-# Project owner
-OWNER=willf
-
-# Project vendor
-VENDOR=willf
-
-# Project name
-PROJECT=bitset
-
-# Project version
-VERSION=$(shell cat VERSION)
-
-# Name of RPM or DEB package
-PKGNAME=${VENDOR}-${PROJECT}
-
-# Current directory
-CURRENTDIR=$(shell pwd)
-
-# GO lang path
-ifneq ($(GOPATH),)
-	ifeq ($(findstring $(GOPATH),$(CURRENTDIR)),)
-		# the defined GOPATH is not valid
-		GOPATH=
-	endif
-endif
-ifeq ($(GOPATH),)
-	# extract the GOPATH
-	GOPATH=$(firstword $(subst /src/, ,$(CURRENTDIR)))
-endif
-
-# --- MAKE TARGETS ---
-
-# Display general help about this command
-help:
-	@echo ""
-	@echo "$(PROJECT) Makefile."
-	@echo "GOPATH=$(GOPATH)"
-	@echo "The following commands are available:"
-	@echo ""
-	@echo "    make qa          : Run all the tests"
-	@echo "    make test        : Run the unit tests"
-	@echo ""
-	@echo "    make format      : Format the source code"
-	@echo "    make fmtcheck    : Check if the source code has been formatted"
-	@echo "    make vet         : Check for suspicious constructs"
-	@echo "    make lint        : Check for style errors"
-	@echo "    make coverage    : Generate the coverage report"
-	@echo "    make cyclo       : Generate the cyclomatic complexity report"
-	@echo "    make ineffassign : Detect ineffectual assignments"
-	@echo "    make misspell    : Detect commonly misspelled words in source files"
-	@echo "    make structcheck : Find unused struct fields"
-	@echo "    make varcheck    : Find unused global variables and constants"
-	@echo "    make errcheck    : Check that error return values are used"
-	@echo "    make gosimple    : Suggest code simplifications"
-	@echo "    make astscan     : GO AST scanner"
-	@echo ""
-	@echo "    make docs        : Generate source code documentation"
-	@echo ""
-	@echo "    make deps        : Get the dependencies"
-	@echo "    make clean       : Remove any build artifact"
-	@echo "    make nuke        : Deletes any intermediate file"
-	@echo ""
-
-# Alias for help target
-all: help
-
-# Run the unit tests
-test:
-	@mkdir -p target/test
-	@mkdir -p target/report
-	GOPATH=$(GOPATH) \
-	go test \
-	-covermode=atomic \
-	-bench=. \
-	-race \
-	-cpuprofile=target/report/cpu.out \
-	-memprofile=target/report/mem.out \
-	-mutexprofile=target/report/mutex.out \
-	-coverprofile=target/report/coverage.out \
-	-v ./... | \
-	tee >(PATH=$(GOPATH)/bin:$(PATH) go-junit-report > target/test/report.xml); \
-	test $${PIPESTATUS[0]} -eq 0
-
-# Format the source code
-format:
-	@find . -type f -name "*.go" -exec gofmt -s -w {} \;
-
-# Check if the source code has been formatted
-fmtcheck:
-	@mkdir -p target
-	@find . -type f -name "*.go" -exec gofmt -s -d {} \; | tee target/format.diff
-	@test ! -s target/format.diff || { echo "ERROR: the source code has not been formatted - please use 'make format' or 'gofmt'"; exit 1; }
-
-# Check for syntax errors
-vet:
-	GOPATH=$(GOPATH) go vet .
-
-# Check for style errors
-lint:
-	GOPATH=$(GOPATH) PATH=$(GOPATH)/bin:$(PATH) golint .
-
-# Generate the coverage report
-coverage:
-	@mkdir -p target/report
-	GOPATH=$(GOPATH) \
-	go tool cover -html=target/report/coverage.out -o target/report/coverage.html
-
-# Report cyclomatic complexity
-cyclo:
-	@mkdir -p target/report
-	GOPATH=$(GOPATH) gocyclo -avg ./ | tee target/report/cyclo.txt ; test $${PIPESTATUS[0]} -eq 0
-
-# Detect ineffectual assignments
-ineffassign:
-	@mkdir -p target/report
-	GOPATH=$(GOPATH) ineffassign ./ | tee target/report/ineffassign.txt ; test $${PIPESTATUS[0]} -eq 0
-
-# Detect commonly misspelled words in source files
-misspell:
-	@mkdir -p target/report
-	GOPATH=$(GOPATH) misspell -error ./  | tee target/report/misspell.txt ; test $${PIPESTATUS[0]} -eq 0
-
-# Find unused struct fields
-structcheck:
-	@mkdir -p target/report
-	GOPATH=$(GOPATH) structcheck -a ./  | tee target/report/structcheck.txt
-
-# Find unused global variables and constants
-varcheck:
-	@mkdir -p target/report
-	GOPATH=$(GOPATH) varcheck -e ./  | tee target/report/varcheck.txt
-
-# Check that error return values are used
-errcheck:
-	@mkdir -p target/report
-	GOPATH=$(GOPATH) errcheck ./  | tee target/report/errcheck.txt
-
-# AST scanner
-astscan:
-	@mkdir -p target/report
-	GOPATH=$(GOPATH) gosec . | tee target/report/astscan.txt ; test $${PIPESTATUS[0]} -eq 0 || true
-
-# Generate source docs
-docs:
-	@mkdir -p target/docs
-	nohup sh -c 'GOPATH=$(GOPATH) godoc -http=127.0.0.1:6060' > target/godoc_server.log 2>&1 &
-	wget --directory-prefix=target/docs/ --execute robots=off --retry-connrefused --recursive --no-parent --adjust-extension --page-requisites --convert-links http://127.0.0.1:6060/pkg/github.com/${VENDOR}/${PROJECT}/ ; kill -9 `lsof -ti :6060`
-	@echo '<html><head><meta http-equiv="refresh" content="0;./127.0.0.1:6060/pkg/'${CVSPATH}'/'${PROJECT}'/index.html"/></head><a href="./127.0.0.1:6060/pkg/'${CVSPATH}'/'${PROJECT}'/index.html">'${PKGNAME}' Documentation ...</a></html>' > target/docs/index.html
-
-# Alias to run all quality-assurance checks
-qa: fmtcheck test vet lint coverage cyclo ineffassign misspell structcheck varcheck errcheck gosimple astscan
-
-# --- INSTALL ---
-
-# Get the dependencies
-deps:
-	GOPATH=$(GOPATH) go get ./...
-	GOPATH=$(GOPATH) go get golang.org/x/lint/golint
-	GOPATH=$(GOPATH) go get github.com/jstemmer/go-junit-report
-	GOPATH=$(GOPATH) go get github.com/axw/gocov/gocov
-	GOPATH=$(GOPATH) go get github.com/fzipp/gocyclo
-	GOPATH=$(GOPATH) go get github.com/gordonklaus/ineffassign
-	GOPATH=$(GOPATH) go get github.com/client9/misspell/cmd/misspell
-	GOPATH=$(GOPATH) go get github.com/opennota/check/cmd/structcheck
-	GOPATH=$(GOPATH) go get github.com/opennota/check/cmd/varcheck
-	GOPATH=$(GOPATH) go get github.com/kisielk/errcheck
-	GOPATH=$(GOPATH) go get github.com/securego/gosec/cmd/gosec/...
-
-# Remove any build artifact
-clean:
-	GOPATH=$(GOPATH) go clean ./...
-
-# Deletes any intermediate file
-nuke:
-	rm -rf ./target
-	GOPATH=$(GOPATH) go clean -i ./...
diff --git a/vendor/github.com/willf/bitset/README.md b/vendor/github.com/willf/bitset/README.md
index 6c62b20c6..50338e71d 100644
--- a/vendor/github.com/willf/bitset/README.md
+++ b/vendor/github.com/willf/bitset/README.md
@@ -2,10 +2,10 @@
 
 *Go language library to map between non-negative integers and boolean values*
 
-[![Master Build Status](https://secure.travis-ci.org/willf/bitset.png?branch=master)](https://travis-ci.org/willf/bitset?branch=master)
+[![Test](https://github.com/willf/bitset/workflows/Test/badge.svg)](https://github.com/willf/bitset/actions?query=workflow%3ATest)
 [![Master Coverage Status](https://coveralls.io/repos/willf/bitset/badge.svg?branch=master&service=github)](https://coveralls.io/github/willf/bitset?branch=master)
 [![Go Report Card](https://goreportcard.com/badge/github.com/willf/bitset)](https://goreportcard.com/report/github.com/willf/bitset)
-[![GoDoc](https://godoc.org/github.com/willf/bitset?status.svg)](http://godoc.org/github.com/willf/bitset)
+[![PkgGoDev](https://pkg.go.dev/badge/github.com/willf/bitset?tab=doc)](https://pkg.go.dev/github.com/willf/bitset?tab=doc)
 
 
 ## Description
@@ -63,8 +63,11 @@ func main() {
 
 As an alternative to BitSets, one should check out the 'big' package, which provides a (less set-theoretical) view of bitsets.
 
-Godoc documentation is at: https://godoc.org/github.com/willf/bitset
+Package documentation is at: https://pkg.go.dev/github.com/willf/bitset?tab=doc
 
+## Memory Usage
+
+The memory usage of a bitset using N bits is at least N/8 bytes. The number of bits in a bitset is at least as large as one plus the greatest bit index you have accessed. Thus it is possible to run out of memory while using a bitset. If you have lots of bits, you might prefer compressed bitsets, like the [Roaring bitmaps](http://roaringbitmap.org) and its [Go implementation](https://github.com/RoaringBitmap/roaring).
 
 ## Implementation Note
 
@@ -82,15 +85,10 @@ go get github.com/willf/bitset
 
 If you wish to contribute to this project, please branch and issue a pull request against master ("[GitHub Flow](https://guides.github.com/introduction/flow/)")
 
-This project include a Makefile that allows you to test and build the project with simple commands.
-To see all available options:
-```bash
-make help
-```
-
 ## Running all tests
 
-Before committing the code, please check if it passes all tests using (note: this will install some dependencies):
+Before committing the code, please check if it passes tests, has adequate coverage, etc.
 ```bash
-make qa
+go test
+go test -cover
 ```
diff --git a/vendor/github.com/willf/bitset/bitset.go b/vendor/github.com/willf/bitset/bitset.go
index 22e5d42e5..21e889da2 100644
--- a/vendor/github.com/willf/bitset/bitset.go
+++ b/vendor/github.com/willf/bitset/bitset.go
@@ -138,6 +138,9 @@ func (b *BitSet) Len() uint {
 // extendSetMaybe adds additional words to incorporate new bits if needed
 func (b *BitSet) extendSetMaybe(i uint) {
 	if i >= b.length { // if we need more bits, make 'em
+		if i >= Cap() {
+			panic("You are exceeding the capacity")
+		}
 		nsize := wordsNeeded(i + 1)
 		if b.set == nil {
 			b.set = make([]uint64, nsize)
@@ -160,7 +163,12 @@ func (b *BitSet) Test(i uint) bool {
 	return b.set[i>>log2WordSize]&(1<<(i&(wordSize-1))) != 0
 }
 
-// Set bit i to 1
+// Set bit i to 1, the capacity of the bitset is automatically
+// increased accordingly.
+// If i>= Cap(), this function will panic.
+// Warning: using a very large value for 'i'
+// may lead to a memory shortage and a panic: the caller is responsible
+// for providing sensible parameters in line with their memory capacity.
 func (b *BitSet) Set(i uint) *BitSet {
 	b.extendSetMaybe(i)
 	b.set[i>>log2WordSize] |= 1 << (i & (wordSize - 1))
@@ -176,7 +184,11 @@ func (b *BitSet) Clear(i uint) *BitSet {
 	return b
 }
 
-// SetTo sets bit i to value
+// SetTo sets bit i to value.
+// If i>= Cap(), this function will panic.
+// Warning: using a very large value for 'i'
+// may lead to a memory shortage and a panic: the caller is responsible
+// for providing sensible parameters in line with their memory capacity.
 func (b *BitSet) SetTo(i uint, value bool) *BitSet {
 	if value {
 		return b.Set(i)
@@ -184,7 +196,11 @@ func (b *BitSet) SetTo(i uint, value bool) *BitSet {
 	return b.Clear(i)
 }
 
-// Flip bit at i
+// Flip bit at i.
+// If i>= Cap(), this function will panic.
+// Warning: using a very large value for 'i'
+// may lead to a memory shortage and a panic: the caller is responsible
+// for providing sensible parameters in line with their memory capacity.
 func (b *BitSet) Flip(i uint) *BitSet {
 	if i >= b.length {
 		return b.Set(i)
@@ -193,26 +209,51 @@ func (b *BitSet) Flip(i uint) *BitSet {
 	return b
 }
 
-// Shrink shrinks BitSet to desired length in bits. It clears all bits > length
-// and reduces the size and length of the set.
+// Shrink shrinks BitSet so that the provided value is the last possible
+// set value. It clears all bits > the provided index and reduces the size
+// and length of the set.
+//
+// Note that the parameter value is not the new length in bits: it is the
+// maximal value that can be stored in the bitset after the function call.
+// The new length in bits is the parameter value + 1. Thus it is not possible
+// to use this function to set the length to 0, the minimal value of the length
+// after this function call is 1.
 //
 // A new slice is allocated to store the new bits, so you may see an increase in
 // memory usage until the GC runs. Normally this should not be a problem, but if you
 // have an extremely large BitSet its important to understand that the old BitSet will
 // remain in memory until the GC frees it.
-func (b *BitSet) Shrink(length uint) *BitSet {
-	idx := wordsNeeded(length + 1)
+func (b *BitSet) Shrink(lastbitindex uint) *BitSet {
+	length := lastbitindex + 1
+	idx := wordsNeeded(length)
 	if idx > len(b.set) {
 		return b
 	}
 	shrunk := make([]uint64, idx)
 	copy(shrunk, b.set[:idx])
 	b.set = shrunk
-	b.length = length + 1
-	b.set[idx-1] &= (allBits >> (uint64(64) - uint64(length&(wordSize-1)) - 1))
+	b.length = length
+	b.set[idx-1] &= (allBits >> (uint64(64) - uint64(length&(wordSize-1))))
 	return b
 }
 
+// Compact shrinks BitSet to so that we preserve all set bits, while minimizing
+// memory usage. Compact calls Shrink.
+func (b *BitSet) Compact() *BitSet {
+	idx := len(b.set) - 1
+	for ; idx >= 0 && b.set[idx] == 0; idx-- {
+	}
+	newlength := uint((idx + 1) << log2WordSize)
+	if newlength >= b.length {
+		return b // nothing to do
+	}
+	if newlength > 0 {
+		return b.Shrink(newlength - 1)
+	}
+	// We preserve one word
+	return b.Shrink(63)
+}
+
 // InsertAt takes an index which indicates where a bit should be
 // inserted. Then it shifts all the bits in the set to the left by 1, starting
 // from the given index position, and sets the index position to 0.
@@ -323,6 +364,9 @@ func (b *BitSet) DeleteAt(i uint) *BitSet {
 // including possibly the current index
 // along with an error code (true = valid, false = no set bit found)
 // for i,e := v.NextSet(0); e; i,e = v.NextSet(i + 1) {...}
+//
+// Users concerned with performance may want to use NextSetMany to
+// retrieve several values at once.
 func (b *BitSet) NextSet(i uint) (uint, bool) {
 	x := int(i >> log2WordSize)
 	if x >= len(b.set) {
@@ -358,6 +402,14 @@ func (b *BitSet) NextSet(i uint) (uint, bool) {
 //     j += 1
 //    }
 //
+//
+// It is possible to retrieve all set bits as follow:
+//
+//    indices := make([]uint, bitmap.Count())
+//    bitmap.NextSetMany(0, indices)
+//
+// However if bitmap.Count() is large, it might be preferable to
+// use several calls to NextSetMany, for performance reasons.
 func (b *BitSet) NextSetMany(i uint, buffer []uint) (uint, []uint) {
 	myanswer := buffer
 	capacity := cap(buffer)
@@ -809,7 +861,7 @@ func (b *BitSet) ReadFrom(stream io.Reader) (int64, error) {
 	newset := New(uint(length))
 
 	if uint64(newset.length) != length {
-		return 0, errors.New("Unmarshalling error: type mismatch")
+		return 0, errors.New("unmarshalling error: type mismatch")
 	}
 
 	// Read remaining bytes as set
diff --git a/vendor/github.com/willf/bitset/go.mod b/vendor/github.com/willf/bitset/go.mod
new file mode 100644
index 000000000..583ecab78
--- /dev/null
+++ b/vendor/github.com/willf/bitset/go.mod
@@ -0,0 +1,3 @@
+module github.com/willf/bitset
+
+go 1.14
diff --git a/vendor/github.com/willf/bitset/go.sum b/vendor/github.com/willf/bitset/go.sum
new file mode 100644
index 000000000..e69de29bb
--- /dev/null
+++ b/vendor/github.com/willf/bitset/go.sum
diff --git a/vendor/modules.txt b/vendor/modules.txt
index c5a61fc51..422a6d88d 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -459,7 +459,7 @@ github.com/opencontainers/runtime-tools/generate
 github.com/opencontainers/runtime-tools/generate/seccomp
 github.com/opencontainers/runtime-tools/specerror
 github.com/opencontainers/runtime-tools/validate
-# github.com/opencontainers/selinux v1.6.0
+# github.com/opencontainers/selinux v1.7.0
 github.com/opencontainers/selinux/go-selinux
 github.com/opencontainers/selinux/go-selinux/label
 github.com/opencontainers/selinux/pkg/pwalk
@@ -568,7 +568,7 @@ github.com/vishvananda/netlink
 github.com/vishvananda/netlink/nl
 # github.com/vishvananda/netns v0.0.0-20191106174202-0a2b9b5464df
 github.com/vishvananda/netns
-# github.com/willf/bitset v1.1.11-0.20200630133818-d5bec3311243
+# github.com/willf/bitset v1.1.11
 github.com/willf/bitset
 # github.com/xeipuuv/gojsonpointer v0.0.0-20190809123943-df4f5c81cb3b
 github.com/xeipuuv/gojsonpointer