diff --git a/frontend/dockerfile/instructions/commands.go b/frontend/dockerfile/instructions/commands.go
index 87252f9f17dd..c5b1762f7187 100644
--- a/frontend/dockerfile/instructions/commands.go
+++ b/frontend/dockerfile/instructions/commands.go
@@ -3,9 +3,8 @@ package instructions
 import (
 	"strings"
 
-	"github.com/docker/docker/api/types/container"
-	"github.com/docker/docker/api/types/strslice"
 	"github.com/moby/buildkit/frontend/dockerfile/parser"
+	dockerspec "github.com/moby/docker-image-spec/specs-go/v1"
 	"github.com/pkg/errors"
 )
 
@@ -325,7 +324,7 @@ type ShellInlineFile struct {
 
 // ShellDependantCmdLine represents a cmdline optionally prepended with the shell
 type ShellDependantCmdLine struct {
-	CmdLine      strslice.StrSlice
+	CmdLine      []string
 	Files        []ShellInlineFile
 	PrependShell bool
 }
@@ -368,7 +367,7 @@ type CmdCommand struct {
 //	HEALTHCHECK <health-config>
 type HealthCheckCommand struct {
 	withNameAndCode
-	Health *container.HealthConfig
+	Health *dockerspec.HealthcheckConfig
 }
 
 // EntrypointCommand sets the default entrypoint of the container to use the
@@ -479,7 +478,7 @@ func (c *ArgCommand) Expand(expander SingleWordExpander) error {
 //	SHELL bash -e -c
 type ShellCommand struct {
 	withNameAndCode
-	Shell strslice.StrSlice
+	Shell []string
 }
 
 // Stage represents a bundled collection of commands.
diff --git a/frontend/dockerfile/instructions/parse.go b/frontend/dockerfile/instructions/parse.go
index b3d684f0d69b..7e34730c6a0a 100644
--- a/frontend/dockerfile/instructions/parse.go
+++ b/frontend/dockerfile/instructions/parse.go
@@ -12,12 +12,11 @@ import (
 	"strings"
 	"time"
 
-	"github.com/docker/docker/api/types/container"
-	"github.com/docker/docker/api/types/strslice"
 	"github.com/moby/buildkit/frontend/dockerfile/command"
 	"github.com/moby/buildkit/frontend/dockerfile/linter"
 	"github.com/moby/buildkit/frontend/dockerfile/parser"
 	"github.com/moby/buildkit/util/suggest"
+	dockerspec "github.com/moby/docker-image-spec/specs-go/v1"
 	"github.com/pkg/errors"
 )
 
@@ -475,12 +474,11 @@ func parseShellDependentCommand(req parseRequest, command string, emptyAsNil boo
 	}
 
 	args := handleJSONArgs(req.args, req.attributes)
-	cmd := strslice.StrSlice(args)
-	if emptyAsNil && len(cmd) == 0 {
-		cmd = nil
+	if emptyAsNil && len(args) == 0 {
+		args = nil
 	}
 	return ShellDependantCmdLine{
-		CmdLine:      cmd,
+		CmdLine:      args,
 		Files:        files,
 		PrependShell: !req.attributes["json"],
 	}, nil
@@ -563,8 +561,10 @@ func parseOptInterval(f *Flag) (time.Duration, error) {
 	if d == 0 {
 		return 0, nil
 	}
-	if d < container.MinimumDuration {
-		return 0, errors.Errorf("Interval %#v cannot be less than %s", f.name, container.MinimumDuration)
+
+	const minimumDuration = time.Millisecond
+	if d < minimumDuration {
+		return 0, errors.Errorf("Interval %#v cannot be less than %s", f.name, minimumDuration)
 	}
 	return d, nil
 }
@@ -582,12 +582,11 @@ func parseHealthcheck(req parseRequest) (*HealthCheckCommand, error) {
 		if len(args) != 0 {
 			return nil, errors.New("HEALTHCHECK NONE takes no arguments")
 		}
-		test := strslice.StrSlice{typ}
-		cmd.Health = &container.HealthConfig{
-			Test: test,
+		cmd.Health = &dockerspec.HealthcheckConfig{
+			Test: []string{typ},
 		}
 	} else {
-		healthcheck := container.HealthConfig{}
+		healthcheck := dockerspec.HealthcheckConfig{}
 
 		flInterval := req.flags.AddString("interval", "")
 		flTimeout := req.flags.AddString("timeout", "")
@@ -610,7 +609,7 @@ func parseHealthcheck(req parseRequest) (*HealthCheckCommand, error) {
 				typ = "CMD-SHELL"
 			}
 
-			healthcheck.Test = strslice.StrSlice(append([]string{typ}, cmdSlice...))
+			healthcheck.Test = append([]string{typ}, cmdSlice...)
 		default:
 			return nil, errors.Errorf("Unknown type %#v in HEALTHCHECK (try CMD)", typ)
 		}
@@ -774,7 +773,7 @@ func parseShell(req parseRequest) (*ShellCommand, error) {
 		// SHELL ["powershell", "-command"]
 
 		return &ShellCommand{
-			Shell:           strslice.StrSlice(shellSlice),
+			Shell:           shellSlice,
 			withNameAndCode: newWithNameAndCode(req),
 		}, nil
 	default:
diff --git a/frontend/dockerfile/instructions/parse_heredoc_test.go b/frontend/dockerfile/instructions/parse_heredoc_test.go
index 28cf034ee9ce..78595c5c9751 100644
--- a/frontend/dockerfile/instructions/parse_heredoc_test.go
+++ b/frontend/dockerfile/instructions/parse_heredoc_test.go
@@ -4,7 +4,6 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/docker/docker/api/types/strslice"
 	"github.com/moby/buildkit/frontend/dockerfile/parser"
 	"github.com/stretchr/testify/require"
 )
@@ -179,22 +178,22 @@ func TestRunHeredoc(t *testing.T) {
 	cases := []struct {
 		dockerfile string
 		shell      bool
-		command    strslice.StrSlice
+		command    []string
 		files      []ShellInlineFile
 	}{
 		{
 			dockerfile: `RUN ["ls", "/"]`,
-			command:    strslice.StrSlice{"ls", "/"},
+			command:    []string{"ls", "/"},
 			shell:      false,
 		},
 		{
 			dockerfile: `RUN ["<<EOF"]`,
-			command:    strslice.StrSlice{"<<EOF"},
+			command:    []string{"<<EOF"},
 			shell:      false,
 		},
 		{
 			dockerfile: "RUN ls /",
-			command:    strslice.StrSlice{"ls /"},
+			command:    []string{"ls /"},
 			shell:      true,
 		},
 		{
@@ -202,7 +201,7 @@ func TestRunHeredoc(t *testing.T) {
 ls /
 whoami
 EOF`,
-			command: strslice.StrSlice{"<<EOF"},
+			command: []string{"<<EOF"},
 			files: []ShellInlineFile{
 				{
 					Name: "EOF",
@@ -216,7 +215,7 @@ EOF`,
 print("hello")
 print("world")
 EOF`,
-			command: strslice.StrSlice{"<<'EOF' | python"},
+			command: []string{"<<'EOF' | python"},
 			files: []ShellInlineFile{
 				{
 					Name: "EOF",
@@ -231,7 +230,7 @@ print("world")
 			dockerfile: `RUN <<-EOF
 	echo test
 EOF`,
-			command: strslice.StrSlice{"<<-EOF"},
+			command: []string{"<<-EOF"},
 			files: []ShellInlineFile{
 				{
 					Name:  "EOF",
diff --git a/solver/llbsolver/history.go b/solver/llbsolver/history.go
index fc4a8ecdb4df..13aed089d331 100644
--- a/solver/llbsolver/history.go
+++ b/solver/llbsolver/history.go
@@ -21,6 +21,7 @@ import (
 	"github.com/moby/buildkit/cmd/buildkitd/config"
 	"github.com/moby/buildkit/identity"
 	containerdsnapshot "github.com/moby/buildkit/snapshot/containerd"
+	"github.com/moby/buildkit/util/iohelper"
 	"github.com/moby/buildkit/util/leaseutil"
 	digest "github.com/opencontainers/go-digest"
 	ocispecs "github.com/opencontainers/image-spec/specs-go/v1"
@@ -254,7 +255,7 @@ func (h *HistoryQueue) migrateBlobV2(ctx context.Context, id string, detectSkipL
 		return false, nil // allow skipping
 	}
 	defer ra.Close()
-	if err := content.Copy(ctx, w, &reader{ReaderAt: ra}, 0, dgst, content.WithLabels(labels)); err != nil {
+	if err := content.Copy(ctx, w, iohelper.ReadCloser(ra), 0, dgst, content.WithLabels(labels)); err != nil {
 		return false, err
 	}
 
@@ -460,9 +461,11 @@ func (h *HistoryQueue) Status(ctx context.Context, ref string, st chan<- *client
 	if err != nil {
 		return err
 	}
-	defer ra.Close()
 
-	brdr := bufio.NewReader(&reader{ReaderAt: ra})
+	rc := iohelper.ReadCloser(ra)
+	defer rc.Close()
+
+	brdr := bufio.NewReader(rc)
 
 	buf := make([]byte, 32*1024)
 
@@ -906,14 +909,3 @@ func (p *channel[T]) close() {
 		close(p.done)
 	})
 }
-
-type reader struct {
-	io.ReaderAt
-	pos int64
-}
-
-func (r *reader) Read(p []byte) (int, error) {
-	n, err := r.ReaderAt.ReadAt(p, r.pos)
-	r.pos += int64(len(p))
-	return n, err
-}
diff --git a/source/containerimage/ocilayout.go b/source/containerimage/ocilayout.go
index 7ade6af55788..820dacfbe7ea 100644
--- a/source/containerimage/ocilayout.go
+++ b/source/containerimage/ocilayout.go
@@ -12,6 +12,7 @@ import (
 	"github.com/moby/buildkit/session"
 	sessioncontent "github.com/moby/buildkit/session/content"
 	"github.com/moby/buildkit/util/imageutil"
+	"github.com/moby/buildkit/util/iohelper"
 	ocispecs "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/pkg/errors"
 )
@@ -51,7 +52,7 @@ func (r *ociLayoutResolver) Fetch(ctx context.Context, desc ocispecs.Descriptor)
 		if err != nil {
 			return err
 		}
-		rc = &readerAtWrapper{readerAt: readerAt}
+		rc = iohelper.ReadCloser(readerAt)
 		return nil
 	})
 	return rc, err
@@ -137,18 +138,3 @@ func (r *ociLayoutResolver) withCaller(ctx context.Context, f func(context.Conte
 		return f(ctx, caller)
 	})
 }
-
-// readerAtWrapper wraps a ReaderAt to give a Reader
-type readerAtWrapper struct {
-	offset   int64
-	readerAt content.ReaderAt
-}
-
-func (r *readerAtWrapper) Read(p []byte) (n int, err error) {
-	n, err = r.readerAt.ReadAt(p, r.offset)
-	r.offset += int64(n)
-	return
-}
-func (r *readerAtWrapper) Close() error {
-	return r.readerAt.Close()
-}
diff --git a/util/compression/compression.go b/util/compression/compression.go
index 2155db4d5715..9569cf6fed95 100644
--- a/util/compression/compression.go
+++ b/util/compression/compression.go
@@ -251,5 +251,5 @@ func decompress(ctx context.Context, cs content.Store, desc ocispecs.Descriptor)
 			return nil, err
 		}
 	}
-	return &iohelper.ReadCloser{ReadCloser: r, CloseFunc: ra.Close}, nil
+	return iohelper.WithCloser(r, ra.Close), nil
 }
diff --git a/util/compression/uncompressed.go b/util/compression/uncompressed.go
index 9242154854b6..a232e58d0c69 100644
--- a/util/compression/uncompressed.go
+++ b/util/compression/uncompressed.go
@@ -6,7 +6,6 @@ import (
 
 	"github.com/containerd/containerd/content"
 	"github.com/containerd/containerd/images"
-	"github.com/docker/docker/pkg/ioutils"
 	"github.com/moby/buildkit/util/iohelper"
 	ocispecs "github.com/opencontainers/image-spec/specs-go/v1"
 )
@@ -22,8 +21,7 @@ func (c uncompressedType) Decompress(ctx context.Context, cs content.Store, desc
 	if err != nil {
 		return nil, err
 	}
-	rdr := io.NewSectionReader(ra, 0, ra.Size())
-	return ioutils.NewReadCloserWrapper(rdr, ra.Close), nil
+	return iohelper.ReadCloser(ra), nil
 }
 
 func (c uncompressedType) NeedsConversion(ctx context.Context, cs content.Store, desc ocispecs.Descriptor) (bool, error) {
diff --git a/util/iohelper/helper.go b/util/iohelper/helper.go
index e0ebaf9bb584..e910c324639b 100644
--- a/util/iohelper/helper.go
+++ b/util/iohelper/helper.go
@@ -15,18 +15,26 @@ func (w *NopWriteCloser) Close() error {
 	return nil
 }
 
-type ReadCloser struct {
-	io.ReadCloser
-	CloseFunc func() error
+type closeFunc func() error
+
+func (c closeFunc) Close() error {
+	return c()
 }
 
-func (rc *ReadCloser) Close() error {
-	err1 := rc.ReadCloser.Close()
-	err2 := rc.CloseFunc()
-	if err1 != nil {
-		return errors.Wrapf(err1, "failed to close: %v", err2)
+// WithCloser returns a ReadCloser with additional closer function.
+func WithCloser(r io.ReadCloser, closer func() error) io.ReadCloser {
+	var f closeFunc = func() error {
+		err1 := r.Close()
+		err2 := closer()
+		if err1 != nil {
+			return errors.Wrapf(err1, "failed to close: %v", err2)
+		}
+		return err2
+	}
+	return &readCloser{
+		Reader: r,
+		Closer: f,
 	}
-	return err2
 }
 
 type WriteCloser struct {
@@ -61,3 +69,22 @@ func (c *Counter) Size() (n int64) {
 	c.mu.Unlock()
 	return
 }
+
+type ReaderAtCloser interface {
+	io.ReaderAt
+	io.Closer
+	Size() int64
+}
+
+// ReadCloser returns a ReadCloser from ReaderAtCloser.
+func ReadCloser(in ReaderAtCloser) io.ReadCloser {
+	return &readCloser{
+		Reader: io.NewSectionReader(in, 0, in.Size()),
+		Closer: in,
+	}
+}
+
+type readCloser struct {
+	io.Reader
+	io.Closer
+}