oci.WithPrivileged: set the current caps, not the known caps

This change is needed for running the latest containerd inside Docker
that is not aware of the recently added caps (BPF, PERFMON, CHECKPOINT_RESTORE).

Without this change, containerd inside Docker fails to run containers with
"apply caps: operation not permitted" error.

See kubernetes-sigs/kind 2058

NOTE: The caller process of this function is now assumed to be as
privileged as possible.

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

oci/spec_opts.go

@@ -38,7 +38,6 @@ import (
 	"github.com/opencontainers/runc/libcontainer/user"
 	specs "github.com/opencontainers/runtime-spec/specs-go"
 	"github.com/pkg/errors"
-	"github.com/syndtr/gocapability/capability"
 )
 
 // SpecOpts sets spec specific information to a newly generated OCI spec
@@ -776,29 +775,6 @@ func WithCapabilities(caps []string) SpecOpts {
 	}
 }
 
-// WithAllCapabilities sets all linux capabilities for the process
-var WithAllCapabilities = func(ctx context.Context, client Client, c *containers.Container, s *Spec) error {
-	return WithCapabilities(GetAllCapabilities())(ctx, client, c, s)
-}
-
-// GetAllCapabilities returns all caps up to CAP_LAST_CAP
-// or CAP_BLOCK_SUSPEND on RHEL6
-func GetAllCapabilities() []string {
-	last := capability.CAP_LAST_CAP
-	// hack for RHEL6 which has no /proc/sys/kernel/cap_last_cap
-	if last == capability.Cap(63) {
-		last = capability.CAP_BLOCK_SUSPEND
-	}
-	var caps []string
-	for _, cap := range capability.List() {
-		if cap > last {
-			continue
-		}
-		caps = append(caps, "CAP_"+strings.ToUpper(cap.String()))
-	}
-	return caps
-}
-
 func capsContain(caps []string, s string) bool {
 	for _, c := range caps {
 		if c == s {
@@ -1132,7 +1108,7 @@ func WithDefaultUnixDevices(_ context.Context, _ Client, _ *containers.Container
 
 // WithPrivileged sets up options for a privileged container
 var WithPrivileged = Compose(
-	WithAllCapabilities,
+	WithAllCurrentCapabilities,
 	WithMaskedPaths(nil),
 	WithReadonlyPaths(nil),
 	WithWriteableSysfs,

oci/spec_opts_linux.go

@@ -25,6 +25,7 @@ import (
 	"path/filepath"
 
 	"github.com/containerd/containerd/containers"
+	"github.com/containerd/containerd/pkg/cap"
 	specs "github.com/opencontainers/runtime-spec/specs-go"
 	"golang.org/x/sys/unix"
 )
@@ -180,3 +181,19 @@ func WithCPUCFS(quota int64, period uint64) SpecOpts {
 		return nil
 	}
 }
+
+// WithAllCurrentCapabilities propagates the effective capabilities of the caller process to the container process.
+// The capability set may differ from WithAllKnownCapabilities when running in a container.
+var WithAllCurrentCapabilities = func(ctx context.Context, client Client, c *containers.Container, s *Spec) error {
+	caps, err := cap.Current()
+	if err != nil {
+		return err
+	}
+	return WithCapabilities(caps)(ctx, client, c, s)
+}
+
+// WithAllKnownCapabilities sets all the the known linux capabilities for the container process
+var WithAllKnownCapabilities = func(ctx context.Context, client Client, c *containers.Container, s *Spec) error {
+	caps := cap.Known()
+	return WithCapabilities(caps)(ctx, client, c, s)
+}

oci/spec_opts_nonlinux.go

@@ -0,0 +1,38 @@
+// +build !linux
+
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package oci
+
+import (
+	"context"
+
+	"github.com/containerd/containerd/containers"
+)
+
+// WithAllCurrentCapabilities propagates the effective capabilities of the caller process to the container process.
+// The capability set may differ from WithAllKnownCapabilities when running in a container.
+//nolint: deadcode, unused
+var WithAllCurrentCapabilities = func(ctx context.Context, client Client, c *containers.Container, s *Spec) error {
+	return WithCapabilities(nil)(ctx, client, c, s)
+}
+
+// WithAllKnownCapabilities sets all the the known linux capabilities for the container process
+//nolint: deadcode, unused
+var WithAllKnownCapabilities = func(ctx context.Context, client Client, c *containers.Container, s *Spec) error {
+	return WithCapabilities(nil)(ctx, client, c, s)
+}

oci/spec_opts_test.go

@@ -574,7 +574,7 @@ func TestDropCaps(t *testing.T) {
 
 	var s specs.Spec
 
-	if err := WithAllCapabilities(context.Background(), nil, nil, &s); err != nil {
+	if err := WithAllKnownCapabilities(context.Background(), nil, nil, &s); err != nil {
 		t.Fatal(err)
 	}
 	if err := WithDroppedCapabilities([]string{"CAP_CHOWN"})(context.Background(), nil, nil, &s); err != nil {
@@ -593,7 +593,7 @@ func TestDropCaps(t *testing.T) {
 	}
 
 	// Add all capabilities back and drop a different cap.
-	if err := WithAllCapabilities(context.Background(), nil, nil, &s); err != nil {
+	if err := WithAllKnownCapabilities(context.Background(), nil, nil, &s); err != nil {
 		t.Fatal(err)
 	}
 	if err := WithDroppedCapabilities([]string{"CAP_FOWNER"})(context.Background(), nil, nil, &s); err != nil {

oci/spec_test.go

@@ -23,6 +23,7 @@ import (
 
 	"github.com/containerd/containerd/containers"
 	"github.com/containerd/containerd/namespaces"
+	"github.com/containerd/containerd/pkg/testutil"
 	specs "github.com/opencontainers/runtime-spec/specs-go"
 )
 
@@ -251,6 +252,10 @@ func TestPopulateDefaultUnixSpec(t *testing.T) {
 
 func TestWithPrivileged(t *testing.T) {
 	t.Parallel()
+	if runtime.GOOS == "linux" {
+		// because WithPrivileged depends on CapEff in /proc/self/status
+		testutil.RequiresRoot(t)
+	}
 
 	ctx := namespaces.WithNamespace(context.Background(), "testing")
 
@@ -272,6 +277,10 @@ func TestWithPrivileged(t *testing.T) {
 		t.Fatal(err)
 	}
 
+	if runtime.GOOS != "linux" {
+		return
+	}
+
 	if len(s.Process.Capabilities.Bounding) == 0 {
 		t.Error("Expected capabilities to be set with privileged")
 	}

pkg/cap/cap_linux.go

@@ -0,0 +1,172 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+// Package cap provides Linux capability utility
+package cap
+
+import (
+	"bufio"
+	"io"
+	"os"
+	"strconv"
+	"strings"
+
+	"github.com/pkg/errors"
+	"github.com/syndtr/gocapability/capability"
+)
+
+// FromUint64 parses an integer into string slice like
+// []{"CAP_SYS_ADMIN", ...}.
+//
+// Unknown cap numbers are returned as []int.
+func FromUint64(v uint64) ([]string, []int) {
+	var (
+		res     []string
+		unknown []int
+	)
+	knownList := capability.List()
+	known := make(map[string]struct{}, len(knownList))
+	for _, f := range knownList {
+		known[f.String()] = struct{}{}
+	}
+	for i := 0; i <= 63; i++ {
+		if b := (v >> i) & 0x1; b == 0x1 {
+			c := capability.Cap(i)
+			sRaw := c.String()
+			if _, ok := known[sRaw]; ok {
+				s := "CAP_" + strings.ToUpper(sRaw)
+				res = append(res, s)
+			} else {
+				unknown = append(unknown, i)
+			}
+		}
+	}
+	return res, unknown
+}
+
+// ParseProcPIDStatus returns uint64 value from /proc/<PID>/status file
+func ParseProcPIDStatus(r io.Reader) (map[capability.CapType]uint64, error) {
+	res := make(map[capability.CapType]uint64)
+	scanner := bufio.NewScanner(r)
+	for scanner.Scan() {
+		line := scanner.Text()
+		pair := strings.SplitN(line, ":", 2)
+		if len(pair) != 2 {
+			continue
+		}
+		k := strings.TrimSpace(pair[0])
+		v := strings.TrimSpace(pair[1])
+		switch k {
+		case "CapInh", "CapPrm", "CapEff", "CapBnd", "CapAmb":
+			ui64, err := strconv.ParseUint(v, 16, 64)
+			if err != nil {
+				return nil, errors.Errorf("failed to parse line %q", line)
+			}
+			switch k {
+			case "CapInh":
+				res[capability.INHERITABLE] = ui64
+			case "CapPrm":
+				res[capability.PERMITTED] = ui64
+			case "CapEff":
+				res[capability.EFFECTIVE] = ui64
+			case "CapBnd":
+				res[capability.BOUNDING] = ui64
+			case "CapAmb":
+				res[capability.AMBIENT] = ui64
+			}
+		}
+	}
+	if err := scanner.Err(); err != nil {
+		return nil, err
+	}
+	return res, nil
+}
+
+// Current returns the list of the effective and the known caps of
+// the current process.
+//
+// The result is like []string{"CAP_SYS_ADMIN", ...}.
+//
+// The result does not contain caps that are not recognized by
+// the "github.com/syndtr/gocapability" library.
+func Current() ([]string, error) {
+	f, err := os.Open("/proc/self/status")
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+	caps, err := ParseProcPIDStatus(f)
+	if err != nil {
+		return nil, err
+	}
+	capEff := caps[capability.EFFECTIVE]
+	names, _ := FromUint64(capEff)
+	return names, nil
+}
+
+var (
+	// caps35 is the caps of kernel 3.5 (37 entries)
+	caps35 = []string{
+		"CAP_CHOWN",            // 2.2
+		"CAP_DAC_OVERRIDE",     // 2.2
+		"CAP_DAC_READ_SEARCH",  // 2.2
+		"CAP_FOWNER",           // 2.2
+		"CAP_FSETID",           // 2.2
+		"CAP_KILL",             // 2.2
+		"CAP_SETGID",           // 2.2
+		"CAP_SETUID",           // 2.2
+		"CAP_SETPCAP",          // 2.2
+		"CAP_LINUX_IMMUTABLE",  // 2.2
+		"CAP_NET_BIND_SERVICE", // 2.2
+		"CAP_NET_BROADCAST",    // 2.2
+		"CAP_NET_ADMIN",        // 2.2
+		"CAP_NET_RAW",          // 2.2
+		"CAP_IPC_LOCK",         // 2.2
+		"CAP_IPC_OWNER",        // 2.2
+		"CAP_SYS_MODULE",       // 2.2
+		"CAP_SYS_RAWIO",        // 2.2
+		"CAP_SYS_CHROOT",       // 2.2
+		"CAP_SYS_PTRACE",       // 2.2
+		"CAP_SYS_PACCT",        // 2.2
+		"CAP_SYS_ADMIN",        // 2.2
+		"CAP_SYS_BOOT",         // 2.2
+		"CAP_SYS_NICE",         // 2.2
+		"CAP_SYS_RESOURCE",     // 2.2
+		"CAP_SYS_TIME",         // 2.2
+		"CAP_SYS_TTY_CONFIG",   // 2.2
+		"CAP_MKNOD",            // 2.4
+		"CAP_LEASE",            // 2.4
+		"CAP_AUDIT_WRITE",      // 2.6.11
+		"CAP_AUDIT_CONTROL",    // 2.6.11
+		"CAP_SETFCAP",          // 2.6.24
+		"CAP_MAC_OVERRIDE",     // 2.6.25
+		"CAP_MAC_ADMIN",        // 2.6.25
+		"CAP_SYSLOG",           // 2.6.37
+		"CAP_WAKE_ALARM",       // 3.0
+		"CAP_BLOCK_SUSPEND",    // 3.5
+	}
+	// caps316 is the caps of kernel 3.16 (38 entries)
+	caps316 = append(caps35, "CAP_AUDIT_READ")
+	// caps58 is the caps of kernel 5.8 (40 entries)
+	caps58 = append(caps316, []string{"CAP_PERFMON", "CAP_BPF"}...)
+	// caps59 is the caps of kernel 5.9 (41 entries)
+	caps59 = append(caps58, "CAP_CHECKPOINT_RESTORE")
+)
+
+// Known returns the known cap strings as of kernel 5.9
+func Known() []string {
+	return caps59
+}

pkg/cap/cap_linux_test.go

@@ -0,0 +1,161 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package cap
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/syndtr/gocapability/capability"
+)
+
+func TestCapsList(t *testing.T) {
+	assert.Len(t, caps316, 38)
+	assert.Len(t, caps58, 40)
+	assert.Len(t, caps59, 41)
+}
+
+func TestFromUint64(t *testing.T) {
+	type testCase struct {
+		comment    string
+		v          uint64
+		knownNames []string
+		unknown    []int
+	}
+	testCases := []testCase{
+		{
+			comment: "No cap",
+			v:       0x0000000000000000,
+		},
+		{
+			// 3.10 (same caps as 3.5) is the oldest kernel version we want to support
+			comment:    "All caps on kernel 3.5 (last = CAP_BLOCK_SUSPEND)",
+			v:          0x0000001fffffffff,
+			knownNames: caps35,
+		},
+		{
+			comment:    "All caps on kernel 3.16 (last = CAP_AUDIT_READ)",
+			v:          0x0000003fffffffff,
+			knownNames: caps316,
+		},
+		{
+			comment:    "All caps on kernel 5.8 (last = CAP_BPF)",
+			v:          0x000000ffffffffff,
+			knownNames: caps58,
+		},
+		{
+			comment:    "All caps on kernel 5.9 (last = CAP_CHECKPOINT_RESTORE)",
+			v:          0x000001ffffffffff,
+			knownNames: caps59,
+		},
+		{
+			comment:    "Unknown caps",
+			v:          0xf00001ffffffffff,
+			knownNames: caps59,
+			unknown:    []int{60, 61, 62, 63},
+		},
+	}
+
+	for _, tc := range testCases {
+		knownNames, unknown := FromUint64(tc.v)
+		t.Logf("[%s] v=0x%x, got=%+v (%d entries), unknown=%v",
+			tc.comment, tc.v, knownNames, len(knownNames), unknown)
+		assert.Equal(t, tc.knownNames, knownNames)
+		assert.Equal(t, tc.unknown, unknown)
+	}
+}
+
+func TestParseProcPIDStatus(t *testing.T) {
+	procPIDStatus := `Name:   cat
+Umask:  0022
+State:  R (running)
+Tgid:   170065
+Ngid:   0
+Pid:    170065
+PPid:   170064
+TracerPid:      0
+Uid:    0       0       0       0
+Gid:    0       0       0       0
+FDSize: 64
+Groups: 0
+NStgid: 170065
+NSpid:  170065
+NSpgid: 170064
+NSsid:  3784
+VmPeak:     8216 kB
+VmSize:     8216 kB
+VmLck:         0 kB
+VmPin:         0 kB
+VmHWM:       676 kB
+VmRSS:       676 kB
+RssAnon:              72 kB
+RssFile:             604 kB
+RssShmem:              0 kB
+VmData:      324 kB
+VmStk:       132 kB
+VmExe:        20 kB
+VmLib:      1612 kB
+VmPTE:        56 kB
+VmSwap:        0 kB
+HugetlbPages:          0 kB
+CoreDumping:    0
+THP_enabled:    1
+Threads:        1
+SigQ:   0/63692
+SigPnd: 0000000000000000
+ShdPnd: 0000000000000000
+SigBlk: 0000000000000000
+SigIgn: 0000000000000000
+SigCgt: 0000000000000000
+CapInh: 0000000000000000
+CapPrm: 000000ffffffffff
+CapEff: 000000ffffffffff
+CapBnd: 000000ffffffffff
+CapAmb: 0000000000000000
+NoNewPrivs:     0
+Seccomp:        0
+Speculation_Store_Bypass:       thread vulnerable
+Cpus_allowed:   00000000,00000000,00000000,0000000f
+Cpus_allowed_list:      0-3
+Mems_allowed:   00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000001
+Mems_allowed_list:      0
+voluntary_ctxt_switches:        0
+nonvoluntary_ctxt_switches:     0
+`
+	res, err := ParseProcPIDStatus(strings.NewReader(procPIDStatus))
+	assert.NoError(t, err)
+	expected := map[capability.CapType]uint64{
+		capability.INHERITABLE: 0,
+		capability.PERMITTED:   0xffffffffff,
+		capability.EFFECTIVE:   0xffffffffff,
+		capability.BOUNDING:    0xffffffffff,
+		capability.AMBIENT:     0,
+	}
+	assert.EqualValues(t, expected, res)
+}
+
+func TestCurrent(t *testing.T) {
+	caps, err := Current()
+	assert.NoError(t, err)
+	t.Logf("verify the result manually: %+v", caps)
+}
+
+func TestKnown(t *testing.T) {
+	caps := Known()
+	assert.EqualValues(t, caps59, caps)
+}

pkg/cri/opts/spec_linux.go

@@ -354,7 +354,7 @@ func WithDevices(osi osinterface.OS, config *runtime.ContainerConfig) oci.SpecOp
 }
 
 // WithCapabilities sets the provided capabilities from the security context
-func WithCapabilities(sc *runtime.LinuxContainerSecurityContext) oci.SpecOpts {
+func WithCapabilities(sc *runtime.LinuxContainerSecurityContext, allCaps []string) oci.SpecOpts {
 	capabilities := sc.GetCapabilities()
 	if capabilities == nil {
 		return nullOpt
@@ -366,7 +366,7 @@ func WithCapabilities(sc *runtime.LinuxContainerSecurityContext) oci.SpecOpts {
 	// AddCapabilities: []string{"ALL"}, DropCapabilities: []string{"CHOWN"}
 	// will be all capabilities without `CAP_CHOWN`.
 	if util.InStringSlice(capabilities.GetAddCapabilities(), "ALL") {
-		opts = append(opts, oci.WithAllCapabilities)
+		opts = append(opts, oci.WithCapabilities(allCaps))
 	}
 	if util.InStringSlice(capabilities.GetDropCapabilities(), "ALL") {
 		opts = append(opts, oci.WithCapabilities(nil))

pkg/cri/server/container_create_linux.go

@@ -217,10 +217,12 @@ func (c *criService) containerSpec(
 			specOpts = append(specOpts, oci.WithHostDevices, oci.WithAllDevicesAllowed)
 		} else {
 			// add requested devices by the config as host devices are not automatically added
-			specOpts = append(specOpts, customopts.WithDevices(c.os, config), customopts.WithCapabilities(securityContext))
+			specOpts = append(specOpts, customopts.WithDevices(c.os, config),
+				customopts.WithCapabilities(securityContext, c.allCaps))
 		}
 	} else { // not privileged
-		specOpts = append(specOpts, customopts.WithDevices(c.os, config), customopts.WithCapabilities(securityContext))
+		specOpts = append(specOpts, customopts.WithDevices(c.os, config),
+			customopts.WithCapabilities(securityContext, c.allCaps))
 	}
 
 	// Clear all ambient capabilities. The implication of non-root + caps

pkg/cri/server/container_create_linux_test.go

@@ -39,6 +39,7 @@ import (
 	"github.com/stretchr/testify/require"
 	runtime "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"
 
+	"github.com/containerd/containerd/pkg/cap"
 	"github.com/containerd/containerd/pkg/cri/annotations"
 	"github.com/containerd/containerd/pkg/cri/config"
 	"github.com/containerd/containerd/pkg/cri/opts"
@@ -191,6 +192,7 @@ func TestContainerCapabilities(t *testing.T) {
 	testSandboxID := "sandbox-id"
 	testContainerName := "container-name"
 	testPid := uint32(1234)
+	allCaps := cap.Known()
 	for desc, test := range map[string]struct {
 		capability *runtime.Capability
 		includes   []string
@@ -208,20 +210,20 @@ func TestContainerCapabilities(t *testing.T) {
 			capability: &runtime.Capability{
 				AddCapabilities: []string{"ALL"},
 			},
-			includes: oci.GetAllCapabilities(),
+			includes: allCaps,
 		},
 		"should be able to drop all capabilities": {
 			capability: &runtime.Capability{
 				DropCapabilities: []string{"ALL"},
 			},
-			excludes: oci.GetAllCapabilities(),
+			excludes: allCaps,
 		},
 		"should be able to drop capabilities with add all": {
 			capability: &runtime.Capability{
 				AddCapabilities:  []string{"ALL"},
 				DropCapabilities: []string{"CHOWN"},
 			},
-			includes: util.SubtractStringSlice(oci.GetAllCapabilities(), "CAP_CHOWN"),
+			includes: util.SubtractStringSlice(allCaps, "CAP_CHOWN"),
 			excludes: []string{"CAP_CHOWN"},
 		},
 		"should be able to add capabilities with drop all": {
@@ -230,13 +232,14 @@ func TestContainerCapabilities(t *testing.T) {
 				DropCapabilities: []string{"ALL"},
 			},
 			includes: []string{"CAP_SYS_ADMIN"},
-			excludes: util.SubtractStringSlice(oci.GetAllCapabilities(), "CAP_SYS_ADMIN"),
+			excludes: util.SubtractStringSlice(allCaps, "CAP_SYS_ADMIN"),
 		},
 	} {
 		t.Logf("TestCase %q", desc)
 		containerConfig, sandboxConfig, imageConfig, specCheck := getCreateContainerTestData()
 		ociRuntime := config.Runtime{}
 		c := newTestCRIService()
+		c.allCaps = allCaps
 
 		containerConfig.Linux.SecurityContext.Capabilities = test.capability
 		spec, err := c.containerSpec(testID, testSandboxID, testPid, "", testContainerName, testImageName, containerConfig, sandboxConfig, imageConfig, nil, ociRuntime)

pkg/cri/server/service.go

@@ -101,6 +101,9 @@ type criService struct {
 	cniNetConfMonitor *cniNetConfSyncer
 	// baseOCISpecs contains cached OCI specs loaded via `Runtime.BaseRuntimeSpec`
 	baseOCISpecs map[string]*oci.Spec
+	// allCaps is the list of the capabilities.
+	// When nil, parsed from CapEff of /proc/self/status.
+	allCaps []string // nolint
 }
 
 // NewCRIService returns a new instance of CRIService

pkg/cri/server/service_linux.go

@@ -17,6 +17,7 @@
 package server
 
 import (
+	"github.com/containerd/containerd/pkg/cap"
 	"github.com/containerd/containerd/sys"
 	cni "github.com/containerd/go-cni"
 	"github.com/opencontainers/selinux/go-selinux"
@@ -61,6 +62,13 @@ func (c *criService) initPlatform() error {
 		return errors.Wrap(err, "failed to initialize cni")
 	}
 
+	if c.allCaps == nil {
+		c.allCaps, err = cap.Current()
+		if err != nil {
+			return errors.Wrap(err, "failed to get caps")
+		}
+	}
+
 	return nil
 }