fix: don't panic on universal go binaries (#2078)

If crypto settings or arch cannot be determined, still attempt to catalog packages from
the build info, rather than panicking.

Signed-off-by: Will Murphy <will.murphy@anchore.com>

syft/pkg/cataloger/golang/parse_go_binary.go

@@ -16,7 +16,6 @@ import (
 	"golang.org/x/mod/module"
 
 	"github.com/anchore/syft/internal"
-	"github.com/anchore/syft/internal/log"
 	"github.com/anchore/syft/syft/artifact"
 	"github.com/anchore/syft/syft/file"
 	"github.com/anchore/syft/syft/pkg"
@@ -57,11 +56,11 @@ func (c *goBinaryCataloger) parseGoBinary(resolver file.Resolver, _ *generic.Env
 		return nil, nil, err
 	}
 
-	mods, archs := scanFile(unionReader, reader.RealPath)
+	mods := scanFile(unionReader, reader.RealPath)
 	internal.CloseAndLogError(reader.ReadCloser, reader.RealPath)
 
-	for i, mod := range mods {
-		pkgs = append(pkgs, c.buildGoPkgInfo(resolver, reader.Location, mod, archs[i])...)
+	for _, mod := range mods {
+		pkgs = append(pkgs, c.buildGoPkgInfo(resolver, reader.Location, mod, mod.arch)...)
 	}
 	return pkgs, nil, nil
 }
@@ -151,42 +150,6 @@ func extractVersionFromLDFlags(ldflags string) (majorVersion string, fullVersion
 	return "", ""
 }
 
-// getArchs finds a binary architecture by two ways:
-// 1) reading build info from binaries compiled by go1.18+
-// 2) reading file headers from binaries compiled by < go1.18
-func getArchs(readers []io.ReaderAt, builds []*extendedBuildInfo) []string {
-	if len(readers) != len(builds) {
-		log.Trace("golang cataloger: bin parsing: number of builds and readers doesn't match")
-		return nil
-	}
-
-	if len(readers) == 0 || len(builds) == 0 {
-		log.Tracef("golang cataloger: bin parsing: %d readers and %d build info items", len(readers), len(builds))
-		return nil
-	}
-
-	archs := make([]string, len(builds))
-	for i, build := range builds {
-		archs[i] = getGOARCH(build.Settings)
-	}
-
-	// if architecture was found via build settings return
-	if archs[0] != "" {
-		return archs
-	}
-
-	for i, r := range readers {
-		a, err := getGOARCHFromBin(r)
-		if err != nil {
-			log.Tracef("golang cataloger: bin parsing: getting arch from binary: %v", err)
-			continue
-		}
-
-		archs[i] = a
-	}
-	return archs
-}
-
 func getGOARCH(settings []debug.BuildSetting) string {
 	for _, s := range settings {
 		if s.Key == GOARCH {

syft/pkg/cataloger/golang/parse_go_binary_test.go

@@ -156,18 +156,12 @@ func TestBuildGoPkgInfo(t *testing.T) {
 	tests := []struct {
 		name     string
 		mod      *extendedBuildInfo
-		arch     string
 		expected []pkg.Package
 	}{
-		{
-			name:     "parse an empty mod",
-			mod:      nil,
-			expected: []pkg.Package(nil),
-		},
 		{
 			name: "package without name",
 			mod: &extendedBuildInfo{
-				&debug.BuildInfo{
+				BuildInfo: &debug.BuildInfo{
 					Deps: []*debug.Module{
 						{
 							Path: "github.com/adrg/xdg",
@@ -177,7 +171,9 @@ func TestBuildGoPkgInfo(t *testing.T) {
 							Version: "v0.2.1",
 						},
 					},
-				}, nil,
+				},
+				cryptoSettings: nil,
+				arch:           "",
 			},
 			expected: []pkg.Package{
 				{
@@ -200,14 +196,13 @@ func TestBuildGoPkgInfo(t *testing.T) {
 		},
 		{
 			name:     "buildGoPkgInfo parses a blank mod and returns no packages",
-			mod:      &extendedBuildInfo{&debug.BuildInfo{}, nil},
+			mod:      &extendedBuildInfo{&debug.BuildInfo{}, nil, ""},
 			expected: []pkg.Package(nil),
 		},
 		{
 			name: "parse a mod without main module",
-			arch: archDetails,
 			mod: &extendedBuildInfo{
-				&debug.BuildInfo{
+				BuildInfo: &debug.BuildInfo{
 					GoVersion: goCompiledVersion,
 					Settings: []debug.BuildSetting{
 						{Key: "GOARCH", Value: archDetails},
@@ -221,7 +216,9 @@ func TestBuildGoPkgInfo(t *testing.T) {
 							Sum:     "h1:VSVdnH7cQ7V+B33qSJHTCRlNgra1607Q8PzEmnvb2Ic=",
 						},
 					},
-				}, nil,
+				},
+				cryptoSettings: nil,
+				arch:           archDetails,
 			},
 			expected: []pkg.Package{
 				{
@@ -249,9 +246,8 @@ func TestBuildGoPkgInfo(t *testing.T) {
 		},
 		{
 			name: "parse a mod with path but no main module",
-			arch: archDetails,
 			mod: &extendedBuildInfo{
-				&debug.BuildInfo{
+				BuildInfo: &debug.BuildInfo{
 					GoVersion: goCompiledVersion,
 					Settings: []debug.BuildSetting{
 						{Key: "GOARCH", Value: archDetails},
@@ -259,7 +255,9 @@ func TestBuildGoPkgInfo(t *testing.T) {
 						{Key: "GOAMD64", Value: "v1"},
 					},
 					Path: "github.com/a/b/c",
-				}, []string{"boringcrypto + fips"},
+				},
+				cryptoSettings: []string{"boringcrypto + fips"},
+				arch:           archDetails,
 			},
 			expected: []pkg.Package{
 				{
@@ -294,9 +292,8 @@ func TestBuildGoPkgInfo(t *testing.T) {
 		},
 		{
 			name: "parse a mod without packages",
-			arch: archDetails,
 			mod: &extendedBuildInfo{
-				&debug.BuildInfo{
+				BuildInfo: &debug.BuildInfo{
 					GoVersion: goCompiledVersion,
 					Main:      debug.Module{Path: "github.com/anchore/syft", Version: "(devel)"},
 					Settings: []debug.BuildSetting{
@@ -304,15 +301,16 @@ func TestBuildGoPkgInfo(t *testing.T) {
 						{Key: "GOOS", Value: "darwin"},
 						{Key: "GOAMD64", Value: "v1"},
 					},
-				}, nil,
+				},
+				cryptoSettings: nil,
+				arch:           archDetails,
 			},
 			expected: []pkg.Package{unmodifiedMain},
 		},
 		{
 			name: "parse main mod and replace devel pseudo version and ldflags exists (but contains no version)",
-			arch: archDetails,
 			mod: &extendedBuildInfo{
-				&debug.BuildInfo{
+				BuildInfo: &debug.BuildInfo{
 					GoVersion: goCompiledVersion,
 					Main:      debug.Module{Path: "github.com/anchore/syft", Version: "(devel)"},
 					Settings: []debug.BuildSetting{
@@ -323,7 +321,9 @@ func TestBuildGoPkgInfo(t *testing.T) {
 						{Key: "vcs.time", Value: "2022-10-14T19:54:57Z"},
 						{Key: "-ldflags", Value: `build	-ldflags="-w -s -extldflags '-static' -X blah=foobar`},
 					},
-				}, nil,
+				},
+				cryptoSettings: nil,
+				arch:           archDetails,
 			},
 			expected: []pkg.Package{
 				{
@@ -359,9 +359,8 @@ func TestBuildGoPkgInfo(t *testing.T) {
 		},
 		{
 			name: "parse main mod and replace devel version with one from ldflags with vcs. build settings",
-			arch: archDetails,
 			mod: &extendedBuildInfo{
-				&debug.BuildInfo{
+				BuildInfo: &debug.BuildInfo{
 					GoVersion: goCompiledVersion,
 					Main:      debug.Module{Path: "github.com/anchore/syft", Version: "(devel)"},
 					Settings: []debug.BuildSetting{
@@ -372,7 +371,9 @@ func TestBuildGoPkgInfo(t *testing.T) {
 						{Key: "vcs.time", Value: "2022-10-14T19:54:57Z"},
 						{Key: "-ldflags", Value: `build	-ldflags="-w -s -extldflags '-static' -X github.com/anchore/syft/internal/version.version=0.79.0`},
 					},
-				}, nil,
+				},
+				cryptoSettings: nil,
+				arch:           archDetails,
 			},
 			expected: []pkg.Package{
 				{
@@ -408,9 +409,8 @@ func TestBuildGoPkgInfo(t *testing.T) {
 		},
 		{
 			name: "parse main mod and replace devel version with one from ldflags without any vcs. build settings",
-			arch: archDetails,
 			mod: &extendedBuildInfo{
-				&debug.BuildInfo{
+				BuildInfo: &debug.BuildInfo{
 					GoVersion: goCompiledVersion,
 					Main:      debug.Module{Path: "github.com/anchore/syft", Version: "(devel)"},
 					Settings: []debug.BuildSetting{
@@ -419,7 +419,9 @@ func TestBuildGoPkgInfo(t *testing.T) {
 						{Key: "GOAMD64", Value: "v1"},
 						{Key: "-ldflags", Value: `build	-ldflags="-w -s -extldflags '-static' -X github.com/anchore/syft/internal/version.version=0.79.0`},
 					},
-				}, nil,
+				},
+				cryptoSettings: nil,
+				arch:           archDetails,
 			},
 			expected: []pkg.Package{
 				{
@@ -453,9 +455,8 @@ func TestBuildGoPkgInfo(t *testing.T) {
 		},
 		{
 			name: "parse main mod and replace devel version with one from ldflags main.version without any vcs. build settings",
-			arch: archDetails,
 			mod: &extendedBuildInfo{
-				&debug.BuildInfo{
+				BuildInfo: &debug.BuildInfo{
 					GoVersion: goCompiledVersion,
 					Main:      debug.Module{Path: "github.com/anchore/syft", Version: "(devel)"},
 					Settings: []debug.BuildSetting{
@@ -464,7 +465,9 @@ func TestBuildGoPkgInfo(t *testing.T) {
 						{Key: "GOAMD64", Value: "v1"},
 						{Key: "-ldflags", Value: `build	-ldflags="-w -s -extldflags '-static' -X main.version=0.79.0`},
 					},
-				}, nil,
+				},
+				cryptoSettings: nil,
+				arch:           archDetails,
 			},
 			expected: []pkg.Package{
 				{
@@ -498,9 +501,8 @@ func TestBuildGoPkgInfo(t *testing.T) {
 		},
 		{
 			name: "parse main mod and replace devel version with one from ldflags main.Version without any vcs. build settings",
-			arch: archDetails,
 			mod: &extendedBuildInfo{
-				&debug.BuildInfo{
+				BuildInfo: &debug.BuildInfo{
 					GoVersion: goCompiledVersion,
 					Main:      debug.Module{Path: "github.com/anchore/syft", Version: "(devel)"},
 					Settings: []debug.BuildSetting{
@@ -509,7 +511,9 @@ func TestBuildGoPkgInfo(t *testing.T) {
 						{Key: "GOAMD64", Value: "v1"},
 						{Key: "-ldflags", Value: `build	-ldflags="-w -s -extldflags '-static' -X main.Version=0.79.0`},
 					},
-				}, nil,
+				},
+				cryptoSettings: nil,
+				arch:           archDetails,
 			},
 			expected: []pkg.Package{
 				{
@@ -543,9 +547,8 @@ func TestBuildGoPkgInfo(t *testing.T) {
 		},
 		{
 			name: "parse main mod and replace devel version with a pseudo version",
-			arch: archDetails,
 			mod: &extendedBuildInfo{
-				&debug.BuildInfo{
+				BuildInfo: &debug.BuildInfo{
 					GoVersion: goCompiledVersion,
 					Main:      debug.Module{Path: "github.com/anchore/syft", Version: "(devel)"},
 					Settings: []debug.BuildSetting{
@@ -555,7 +558,9 @@ func TestBuildGoPkgInfo(t *testing.T) {
 						{Key: "vcs.revision", Value: "41bc6bb410352845f22766e27dd48ba93aa825a4"},
 						{Key: "vcs.time", Value: "2022-10-14T19:54:57Z"},
 					},
-				}, nil,
+				},
+				cryptoSettings: nil,
+				arch:           archDetails,
 			},
 			expected: []pkg.Package{
 				{
@@ -590,9 +595,8 @@ func TestBuildGoPkgInfo(t *testing.T) {
 		},
 		{
 			name: "parse a populated mod string and returns packages but no source info",
-			arch: archDetails,
 			mod: &extendedBuildInfo{
-				&debug.BuildInfo{
+				BuildInfo: &debug.BuildInfo{
 					GoVersion: goCompiledVersion,
 					Main:      debug.Module{Path: "github.com/anchore/syft", Version: "(devel)"},
 					Settings: []debug.BuildSetting{
@@ -612,7 +616,9 @@ func TestBuildGoPkgInfo(t *testing.T) {
 							Sum:     "h1:DYssiUV1pBmKqzKsm4mqXx8artqC0Q8HgZsVI3lMsAg=",
 						},
 					},
-				}, nil,
+				},
+				cryptoSettings: nil,
+				arch:           archDetails,
 			},
 			expected: []pkg.Package{
 				{
@@ -664,9 +670,8 @@ func TestBuildGoPkgInfo(t *testing.T) {
 		},
 		{
 			name: "parse a populated mod string and returns packages when a replace directive exists",
-			arch: archDetails,
 			mod: &extendedBuildInfo{
-				&debug.BuildInfo{
+				BuildInfo: &debug.BuildInfo{
 					GoVersion: goCompiledVersion,
 					Main:      debug.Module{Path: "github.com/anchore/syft", Version: "(devel)"},
 					Settings: []debug.BuildSetting{
@@ -691,7 +696,9 @@ func TestBuildGoPkgInfo(t *testing.T) {
 							},
 						},
 					},
-				}, nil,
+				},
+				cryptoSettings: nil,
+				arch:           archDetails,
 			},
 			expected: []pkg.Package{
 				{
@@ -756,7 +763,7 @@ func TestBuildGoPkgInfo(t *testing.T) {
 			)
 
 			c := goBinaryCataloger{}
-			pkgs := c.buildGoPkgInfo(fileresolver.Empty{}, location, test.mod, test.arch)
+			pkgs := c.buildGoPkgInfo(fileresolver.Empty{}, location, test.mod, test.mod.arch)
 			assert.Equal(t, test.expected, pkgs)
 		})
 	}

syft/pkg/cataloger/golang/scan_binary.go

@@ -15,16 +15,17 @@ import (
 type extendedBuildInfo struct {
 	*debug.BuildInfo
 	cryptoSettings []string
+	arch           string
 }
 
 // scanFile scans file to try to report the Go and module versions.
-func scanFile(reader unionreader.UnionReader, filename string) ([]*extendedBuildInfo, []string) {
+func scanFile(reader unionreader.UnionReader, filename string) []*extendedBuildInfo {
 	// NOTE: multiple readers are returned to cover universal binaries, which are files
 	// with more than one binary
 	readers, err := unionreader.GetReaders(reader)
 	if err != nil {
 		log.WithFields("error", err).Warnf("failed to open a golang binary")
-		return nil, nil
+		return nil
 	}
 
 	var builds []*extendedBuildInfo
@@ -34,6 +35,7 @@ func scanFile(reader unionreader.UnionReader, filename string) ([]*extendedBuild
 			log.WithFields("file", filename, "error", err).Trace("unable to read golang buildinfo")
 			continue
 		}
+		// it's possible the reader just isn't a go binary, in which case just skip it
 		if bi == nil {
 			continue
 		}
@@ -41,15 +43,22 @@ func scanFile(reader unionreader.UnionReader, filename string) ([]*extendedBuild
 		v, err := getCryptoInformation(r)
 		if err != nil {
 			log.WithFields("file", filename, "error", err).Trace("unable to read golang version info")
-			continue
+			// don't skip this build info.
+			// we can still catalog packages, even if we can't get the crypto information
+		}
+		arch := getGOARCH(bi.Settings)
+		if arch == "" {
+			arch, err = getGOARCHFromBin(r)
+			if err != nil {
+				log.WithFields("file", filename, "error", err).Trace("unable to read golang arch info")
+				// don't skip this build info.
+				// we can still catalog packages, even if we can't get the arch information
+			}
 		}
 
-		builds = append(builds, &extendedBuildInfo{bi, v})
+		builds = append(builds, &extendedBuildInfo{bi, v, arch})
 	}
-
-	archs := getArchs(readers, builds)
-
-	return builds, archs
+	return builds
 }
 
 func getCryptoInformation(reader io.ReaderAt) ([]string, error) {