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