.

pkg/pclntab/pclntab_elf.go

@@ -0,0 +1,57 @@
+//go:build linux
+
+package pclntab
+
+import (
+	"debug/elf"
+	"fmt"
+)
+
+func readPclntabSection(binaryPath string) ([]byte, error) {
+	f, err := elf.Open(binaryPath)
+	if err != nil {
+		return nil, fmt.Errorf("pclntab: failed to open ELF: %w", err)
+	}
+	defer f.Close()
+
+	sectionNames := []string{
+		".gopclntab",
+		"runtime.pclntab",
+		"runtime.pclntab_v1",
+	}
+
+	for _, name := range sectionNames {
+		section := f.Section(name)
+		if section != nil {
+			data, err := section.Data()
+			if err != nil {
+				return nil, fmt.Errorf("pclntab: failed to read section %s: %w", name, err)
+			}
+			buf := make([]byte, len(data))
+			copy(buf, data)
+			return buf, nil
+		}
+	}
+
+	for _, section := range f.Sections {
+		data, err := section.Data()
+		if err != nil {
+			continue
+		}
+		if len(data) >= 8 {
+			for _, magic := range pclntabMagics {
+				if len(data) >= len(magic) && bytesEqual(data[:len(magic)], magic) {
+					buf := make([]byte, len(data))
+					copy(buf, data)
+					return buf, nil
+				}
+			}
+		}
+	}
+
+	return nil, nil
+}
+
+func WriteCorruptedPclntab(binaryPath string, corrupted []byte, outputPath string) error {
+	return fmt.Errorf("pclntab: offline ELF patching not yet implemented; use runtime corruption instead")
+}