mirror of
https://github.com/reactos/syzkaller.git
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96 lines
2.1 KiB
Go
96 lines
2.1 KiB
Go
// Copyright 2019 syzkaller project authors. All rights reserved.
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// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
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// +build linux
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package build
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import (
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"bytes"
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"os"
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"strings"
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"sync"
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"testing"
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"text/template"
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"github.com/google/syzkaller/pkg/osutil"
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)
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func TestElfBinarySignature(t *testing.T) {
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t.Parallel()
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enumerateFlags(t, nil, []string{"-g", "-O1", "-O2", "-no-pie", "-static"})
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}
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func enumerateFlags(t *testing.T, flags, allFlags []string) {
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if len(allFlags) != 0 {
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enumerateFlags(t, flags, allFlags[1:])
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enumerateFlags(t, append(flags, allFlags[0]), allFlags[1:])
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return
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}
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t.Run(strings.Join(flags, "-"), func(t *testing.T) {
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t.Parallel()
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sign1, sign2 := "", ""
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var wg sync.WaitGroup
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wg.Add(2)
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go func() {
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sign1 = sign(t, flags, false, false)
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wg.Done()
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}()
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go func() {
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sign2 = sign(t, flags, false, true)
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wg.Done()
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}()
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sign3 := sign(t, flags, true, false)
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wg.Wait()
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if sign1 != sign2 {
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t.Errorf("signature has changed after a comment-only change")
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}
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if sign1 == sign3 {
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t.Errorf("signature has not changed after a change")
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}
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})
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}
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func sign(t *testing.T, flags []string, changed, comment bool) string {
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buf := new(bytes.Buffer)
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if err := srcTemplate.Execute(buf, SrcParams{Changed: changed, Comment: comment}); err != nil {
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t.Fatal(err)
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}
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src := buf.Bytes()
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bin, err := osutil.TempFile("syz-build-test")
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if err != nil {
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t.Fatal(err)
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}
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defer os.Remove(bin)
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cmd := osutil.Command("gcc", append(flags, "-pthread", "-o", bin, "-x", "c", "-")...)
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cmd.Stdin = buf
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out, err := cmd.CombinedOutput()
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if err != nil {
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t.Fatalf("compiler failed: %v\n%s\n\n%s", err, src, out)
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}
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sign, err := elfBinarySignature(bin)
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if err != nil {
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t.Fatal(err)
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}
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return sign
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}
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type SrcParams struct {
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Changed bool
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Comment bool
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}
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var srcTemplate = template.Must(template.New("").Parse(`
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#include <stdio.h>
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#include <pthread.h>
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int main() {
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int x = {{if .Changed}}0{{else}}1{{end}};
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{{if .Comment}}
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// Some comment goes here.
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// It affects line numbers in debug info.
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{{end}}
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printf("%d %p\n", x, pthread_create);
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}
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`))
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