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// Copyright 2015 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.
package ipc
import (
"bufio"
"bytes"
"math/rand"
"os"
"strings"
"testing"
"time"
"github.com/google/syzkaller/csource"
"github.com/google/syzkaller/fileutil"
"github.com/google/syzkaller/prog"
)
const timeout = 10 * time.Second
func buildExecutor(t *testing.T) string {
return buildProgram(t, "../executor/executor.cc")
}
func buildSource(t *testing.T, src []byte) string {
tmp, err := fileutil.WriteTempFile(src)
if err != nil {
t.Fatalf("%v", err)
}
defer os.Remove(tmp)
return buildProgram(t, tmp)
}
func buildProgram(t *testing.T, src string) string {
bin, err := csource.Build(src)
if err != nil {
t.Fatalf("%v", err)
}
return bin
}
func initTest(t *testing.T) (rand.Source, int) {
iters := 100
if testing.Short() {
iters = 10
}
seed := int64(time.Now().UnixNano())
rs := rand.NewSource(seed)
t.Logf("seed=%v", seed)
return rs, iters
}
func TestEmptyProg(t *testing.T) {
bin := buildExecutor(t)
defer os.Remove(bin)
env, err := MakeEnv(bin, timeout, 0)
if err != nil {
t.Fatalf("failed to create env: %v", err)
}
defer env.Close()
p := new(prog.Prog)
output, strace, cov, _, failed, hanged, err := env.Exec(p)
if err != nil {
t.Fatalf("failed to run executor: %v", err)
}
if len(output) != 0 {
t.Fatalf("output on empty program")
}
if len(strace) != 0 {
t.Fatalf("strace output when not stracing")
}
if cov != nil {
t.Fatalf("haven't asked for coverage, but got it")
}
if failed || hanged {
t.Fatalf("empty program failed")
}
}
func TestStrace(t *testing.T) {
t.Skip("strace is broken")
bin := buildExecutor(t)
defer os.Remove(bin)
env, err := MakeEnv(bin, timeout, FlagStrace)
if err != nil {
t.Fatalf("failed to create env: %v", err)
}
defer env.Close()
p := new(prog.Prog)
_, strace, _, _, failed, hanged, err := env.Exec(p)
if err != nil {
t.Fatalf("failed to run executor: %v", err)
}
if len(strace) == 0 {
t.Fatalf("no strace output")
}
if failed || hanged {
t.Fatalf("empty program failed")
}
}
func TestExecute(t *testing.T) {
bin := buildExecutor(t)
defer os.Remove(bin)
rs, iters := initTest(t)
flags := []uint64{0, FlagStrace, FlagThreaded, FlagStrace | FlagThreaded}
for _, flag := range flags {
env, err := MakeEnv(bin, timeout, flag)
if err != nil {
t.Fatalf("failed to create env: %v", err)
}
defer env.Close()
for i := 0; i < iters/len(flags); i++ {
p := prog.Generate(rs, 10, nil)
_, _, _, _, _, _, err := env.Exec(p)
if err != nil {
t.Logf("program:\n%s\n", p.Serialize())
t.Fatalf("failed to run executor: %v", err)
}
}
}
}
func TestCompare(t *testing.T) {
t.Skip("flaky")
bin := buildExecutor(t)
defer os.Remove(bin)
// Sequence of syscalls that statically linked libc produces on startup.
rawTracePrefix := []string{"execve", "uname", "brk", "brk", "arch_prctl",
"readlink", "brk", "brk", "access"}
executorTracePrefix := []string{"execve", "uname", "brk", "brk", "arch_prctl",
"set_tid_address", "set_robust_list", "futex", "rt_sigaction", "rt_sigaction",
"rt_sigprocmask", "getrlimit", "readlink", "brk", "brk", "access", "mmap", "mmap"}
// These calls produce non-deterministic results, ignore them.
nondet := []string{"getrusage", "msgget", "msgrcv", "msgsnd", "shmget", "semat", "io_setup", "getpgrp",
"getpid", "getpgid", "getppid", "setsid", "ppoll", "keyctl", "ioprio_get",
"move_pages", "kcmp"}
env1, err := MakeEnv(bin, timeout, FlagStrace)
if err != nil {
t.Fatalf("failed to create env: %v", err)
}
defer env1.Close()
rs, iters := initTest(t)
for i := 0; i < iters; i++ {
p := prog.Generate(rs, 10, nil)
_, strace1, _, _, _, _, err := env1.Exec(p)
if err != nil {
t.Fatalf("failed to run executor: %v", err)
}
src := csource.Write(p, csource.Options{})
cprog := buildSource(t, src)
defer os.Remove(cprog)
env2, err := MakeEnv(cprog, timeout, FlagStrace)
if err != nil {
t.Fatalf("failed to create env: %v", err)
}
defer env2.Close() // yes, that's defer in a loop
_, strace2, _, _, _, _, err := env2.Exec(nil)
if err != nil {
t.Fatalf("failed to run c binary: %v", err)
}
stripPrefix := func(data []byte, prefix []string) string {
prefix0 := prefix
buf := new(bytes.Buffer)
s := bufio.NewScanner(bytes.NewReader(data))
for s.Scan() {
if strings.HasPrefix(s.Text(), "--- SIG") {
// Signal parameters can contain pid and pc.
continue
}
if len(prefix) == 0 {
skip := false
for _, c := range nondet {
if strings.HasPrefix(s.Text(), c) {
skip = true
break
}
}
if skip {
continue
}
buf.WriteString(s.Text())
buf.Write([]byte{'\n'})
continue
}
if !strings.HasPrefix(s.Text(), prefix[0]) {
t.Fatalf("strace output does not start with expected prefix\ngot:\n%s\nexpect prefix: %+v\ncurrent call: %v", data, prefix0, prefix[0])
}
prefix = prefix[1:]
}
if err := s.Err(); err != nil {
t.Fatalf("failed to scan strace output: %v", err)
}
return buf.String()
}
s1 := stripPrefix(strace1, executorTracePrefix)
s2 := stripPrefix(strace2, rawTracePrefix)
if s1 == "" || s1 != s2 {
t.Logf("program:\n%s\n", p.Serialize())
t.Fatalf("strace output differs:\n%s\n\n\n%s\n", s1, s2)
}
}
}
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