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// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build go1.18
// +build go1.18
package buildinfo
// Code in this package is dervied from src/cmd/go/internal/version/version.go
// and cmd/go/internal/version/exe.go.
import (
"debug/buildinfo"
"errors"
"fmt"
"io"
"net/url"
"runtime/debug"
"strings"
"golang.org/x/tools/go/packages"
"golang.org/x/vuln/internal/gosym"
)
func debugModulesToPackagesModules(debugModules []*debug.Module) []*packages.Module {
packagesModules := make([]*packages.Module, len(debugModules))
for i, mod := range debugModules {
packagesModules[i] = &packages.Module{
Path: mod.Path,
Version: mod.Version,
}
if mod.Replace != nil {
packagesModules[i].Replace = &packages.Module{
Path: mod.Replace.Path,
Version: mod.Replace.Version,
}
}
}
return packagesModules
}
type Symbol struct {
Pkg string `json:"pkg,omitempty"`
Name string `json:"name,omitempty"`
}
// ExtractPackagesAndSymbols extracts symbols, packages, modules from
// bin as well as bin's metadata.
//
// If the symbol table is not available, such as in the case of stripped
// binaries, returns module and binary info but without the symbol info.
func ExtractPackagesAndSymbols(bin io.ReaderAt) ([]*packages.Module, []Symbol, *debug.BuildInfo, error) {
bi, err := buildinfo.Read(bin)
if err != nil {
return nil, nil, nil, err
}
funcSymName := gosym.FuncSymName(bi.GoVersion)
if funcSymName == "" {
return nil, nil, nil, fmt.Errorf("binary built using unsupported Go version: %q", bi.GoVersion)
}
x, err := openExe(bin)
if err != nil {
return nil, nil, nil, err
}
value, base, r, err := x.SymbolInfo(funcSymName)
if err != nil {
if errors.Is(err, ErrNoSymbols) {
// bin is stripped, so return just module info and metadata.
return debugModulesToPackagesModules(bi.Deps), nil, bi, nil
}
return nil, nil, nil, fmt.Errorf("reading %v: %v", funcSymName, err)
}
pclntab, textOffset := x.PCLNTab()
if pclntab == nil {
// If we have build information, but not PCLN table, fall
// back to much higher granularity vulnerability checking.
return debugModulesToPackagesModules(bi.Deps), nil, bi, nil
}
lineTab := gosym.NewLineTable(pclntab, textOffset)
if lineTab == nil {
return nil, nil, nil, errors.New("invalid line table")
}
tab, err := gosym.NewTable(nil, lineTab)
if err != nil {
return nil, nil, nil, err
}
pkgSyms := make(map[Symbol]bool)
for _, f := range tab.Funcs {
if f.Func == nil {
continue
}
pkgName, symName, err := parseName(f.Func.Sym)
if err != nil {
return nil, nil, nil, err
}
pkgSyms[Symbol{pkgName, symName}] = true
// Collect symbols that were inlined in f.
it, err := lineTab.InlineTree(&f, value, base, r)
if err != nil {
return nil, nil, nil, fmt.Errorf("InlineTree: %v", err)
}
for _, ic := range it {
pkgName, symName, err := parseName(&gosym.Sym{Name: ic.Name})
if err != nil {
return nil, nil, nil, err
}
pkgSyms[Symbol{pkgName, symName}] = true
}
}
var syms []Symbol
for ps := range pkgSyms {
syms = append(syms, ps)
}
return debugModulesToPackagesModules(bi.Deps), syms, bi, nil
}
func parseName(s *gosym.Sym) (pkg, sym string, err error) {
symName := s.BaseName()
if r := s.ReceiverName(); r != "" {
if strings.HasPrefix(r, "(*") {
r = strings.Trim(r, "(*)")
}
symName = fmt.Sprintf("%s.%s", r, symName)
}
pkgName := s.PackageName()
if pkgName != "" {
pkgName, err = url.PathUnescape(pkgName)
if err != nil {
return "", "", err
}
}
return pkgName, symName, nil
}
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