feat: support zImage and bzImage in linux-kernel-cataloger (#4751)

Signed-off-by: Nadim Zubidat <nadimz@users.noreply.github.com>

syft/pkg/cataloger/kernel/capabilities.yaml

@@ -31,6 +31,10 @@ catalogers:
           - '**/vmlinux-*'
           - '**/vmlinuz'
           - '**/vmlinuz-*'
+          - '**/bzImage'
+          - '**/bzImage-*'
+          - '**/zImage'
+          - '**/zImage-*'
           - '**/lib/modules/**/*.ko'
     metadata_types: # AUTO-GENERATED
       - pkg.LinuxKernel

syft/pkg/cataloger/kernel/cataloger.go

@@ -39,6 +39,10 @@ var kernelArchiveGlobs = []string{
 	"**/vmlinux-*",
 	"**/vmlinuz",
 	"**/vmlinuz-*",
+	"**/bzImage",
+	"**/bzImage-*",
+	"**/zImage",
+	"**/zImage-*",
 }
 
 var kernelModuleGlobs = []string{

syft/pkg/cataloger/kernel/parse_linux_kernel_file_test.go

@@ -0,0 +1,37 @@
+package kernel
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestParseLinuxKernelMetadata_bzImage_PositiveCase(t *testing.T) {
+	magicType := []string{
+		"Linux kernel",
+		"x86 boot executable",
+		"bzImage",
+		"version 4.12.29-17011406-standard (oe-user@oe-host) #1 SMP Tue Apr 20 22:18:27 UTC 2021",
+	}
+
+	got := parseLinuxKernelMetadata(magicType)
+
+	assert.Equal(t, "x86", got.Architecture)
+	assert.Equal(t, "bzImage", got.Format)
+	assert.Equal(t, "4.12.29-17011406-standard", got.Version)
+	assert.NotEmpty(t, got.ExtendedVersion)
+}
+
+func TestParseLinuxKernelMetadata_bzImage_EmptyVersion(t *testing.T) {
+	magicType := []string{
+		"Linux kernel",
+		"x86 boot executable",
+		"bzImage",
+		// no "version ..." token
+	}
+
+	got := parseLinuxKernelMetadata(magicType)
+
+	assert.Equal(t, "bzImage", got.Format)
+	assert.Empty(t, got.Version, "version should be empty when no version token is present")
+}