exporter: add validation for invalid platorm

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
(cherry picked from commit d293ec3208f87fefab7a1caadffa3f3f50604796)
(cherry picked from commit 42b95935d606b262a33374eeeb452bb7c299c729)

client/client_test.go

@@ -207,6 +207,7 @@ func TestIntegration(t *testing.T) {
 		testExportLocalNoPlatformSplit,
 		testExportLocalNoPlatformSplitOverwrite,
 		testValidateNullConfig,
+		testValidateInvalidConfig,
 	)
 }
 
@@ -8490,6 +8491,7 @@ cat <<EOF > $BUILDKIT_SCAN_DESTINATION/spdx.json
 EOF
 `
 		img.Config.Cmd = []string{"/bin/sh", "-c", cmd}
+		img.Platform = p
 		config, err := json.Marshal(img)
 		if err != nil {
 			return nil, errors.Wrapf(err, "failed to marshal image config")
@@ -8768,6 +8770,7 @@ cat <<EOF > $BUILDKIT_SCAN_DESTINATION/spdx.json
 EOF
 `
 		img.Config.Cmd = []string{"/bin/sh", "-c", cmd}
+		img.Platform = p
 		config, err := json.Marshal(img)
 		if err != nil {
 			return nil, errors.Wrapf(err, "failed to marshal image config")
@@ -8820,6 +8823,7 @@ EOF
 
 		var img ocispecs.Image
 		img.Config.Cmd = []string{"/bin/sh", "-c", "cat /greeting"}
+		img.Platform = p
 		config, err := json.Marshal(img)
 		if err != nil {
 			return nil, errors.Wrapf(err, "failed to marshal image config")

client/validation_test.go

@@ -2,12 +2,14 @@ package client
 
 import (
 	"context"
+	"encoding/json"
 	"io"
 	"testing"
 
 	"github.com/moby/buildkit/client/llb"
 	"github.com/moby/buildkit/frontend/gateway/client"
 	"github.com/moby/buildkit/util/testutil/integration"
+	ocispecs "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/stretchr/testify/require"
 )
 
@@ -48,3 +50,49 @@ func testValidateNullConfig(t *testing.T, sb integration.Sandbox) {
 	require.Error(t, err)
 	require.Contains(t, err.Error(), "invalid null image config for export")
 }
+
+func testValidateInvalidConfig(t *testing.T, sb integration.Sandbox) {
+	requiresLinux(t)
+
+	ctx := sb.Context()
+
+	c, err := New(ctx, sb.Address())
+	require.NoError(t, err)
+	defer c.Close()
+
+	b := func(ctx context.Context, c client.Client) (*client.Result, error) {
+		def, err := llb.Scratch().Marshal(ctx)
+		if err != nil {
+			return nil, err
+		}
+
+		res, err := c.Solve(ctx, client.SolveRequest{
+			Evaluate:   true,
+			Definition: def.ToPB(),
+		})
+		if err != nil {
+			return nil, err
+		}
+		var img ocispecs.Image
+		img.Platform = ocispecs.Platform{
+			Architecture: "amd64",
+		}
+		dt, err := json.Marshal(img)
+		if err != nil {
+			return nil, err
+		}
+		res.AddMeta("containerimage.config", dt)
+		return res, nil
+	}
+
+	_, err = c.Build(ctx, SolveOpt{
+		Exports: []ExportEntry{
+			{
+				Type:   ExporterOCI,
+				Output: fixedWriteCloser(nopWriteCloser{io.Discard}),
+			},
+		},
+	}, "", b, nil)
+	require.Error(t, err)
+	require.Contains(t, err.Error(), "invalid image config for export: missing os")
+}

exporter/containerimage/writer.go

@@ -583,6 +583,13 @@ func patchImageConfig(dt []byte, descs []ocispecs.Descriptor, history []ocispecs
 		return nil, errors.Errorf("invalid null image config for export")
 	}
 
+	if img.OS == "" {
+		return nil, errors.Errorf("invalid image config for export: missing os")
+	}
+	if img.Architecture == "" {
+		return nil, errors.Errorf("invalid image config for export: missing architecture")
+	}
+
 	var rootFS ocispecs.RootFS
 	rootFS.Type = "layers"
 	for _, desc := range descs {