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// Copyright 2022 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 linux || (freebsd && amd64)
package sanitizers_test
import (
"internal/testenv"
"strings"
"testing"
)
func TestLibFuzzer(t *testing.T) {
testenv.MustHaveGoBuild(t)
testenv.MustHaveCGO(t)
goos, err := goEnv("GOOS")
if err != nil {
t.Fatal(err)
}
goarch, err := goEnv("GOARCH")
if err != nil {
t.Fatal(err)
}
if !libFuzzerSupported(goos, goarch) {
t.Skipf("skipping on %s/%s; libfuzzer option is not supported.", goos, goarch)
}
config := configure("fuzzer")
config.skipIfCSanitizerBroken(t)
cases := []struct {
goSrc string
cSrc string
expectedError string
}{
{goSrc: "libfuzzer1.go", expectedError: "panic: found it"},
{goSrc: "libfuzzer2.go", cSrc: "libfuzzer2.c", expectedError: "panic: found it"},
}
for _, tc := range cases {
tc := tc
name := strings.TrimSuffix(tc.goSrc, ".go")
t.Run(name, func(t *testing.T) {
t.Parallel()
dir := newTempDir(t)
defer dir.RemoveAll(t)
// build Go code in libfuzzer mode to a c-archive
outPath := dir.Join(name)
archivePath := dir.Join(name + ".a")
mustRun(t, config.goCmd("build", "-buildmode=c-archive", "-o", archivePath, srcPath(tc.goSrc)))
// build C code (if any) and link with Go code
cmd, err := cc(config.cFlags...)
if err != nil {
t.Fatalf("error running cc: %v", err)
}
cmd.Args = append(cmd.Args, config.ldFlags...)
cmd.Args = append(cmd.Args, "-o", outPath, "-I", dir.Base())
if tc.cSrc != "" {
cmd.Args = append(cmd.Args, srcPath(tc.cSrc))
}
cmd.Args = append(cmd.Args, archivePath)
mustRun(t, cmd)
cmd = hangProneCmd(outPath)
cmd.Dir = dir.Base()
outb, err := cmd.CombinedOutput()
out := string(outb)
if err == nil {
t.Fatalf("fuzzing succeeded unexpectedly; output:\n%s", out)
}
if !strings.Contains(out, tc.expectedError) {
t.Errorf("exited without expected error %q; got\n%s", tc.expectedError, out)
}
})
}
}
// libFuzzerSupported is a copy of the function internal/platform.FuzzInstrumented,
// because the internal package can't be used here.
func libFuzzerSupported(goos, goarch string) bool {
switch goarch {
case "amd64", "arm64":
// TODO(#14565): support more architectures.
switch goos {
case "darwin", "freebsd", "linux", "windows":
return true
default:
return false
}
default:
return false
}
}