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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 csource
import (
"fmt"
"math/rand"
"os"
"regexp"
"runtime"
"strings"
"sync/atomic"
"testing"
"github.com/google/syzkaller/pkg/testutil"
"github.com/google/syzkaller/prog"
_ "github.com/google/syzkaller/sys"
"github.com/google/syzkaller/sys/targets"
"github.com/stretchr/testify/assert"
)
func init() {
// csource tests consume too much memory under race detector (>1GB),
// and periodically timeout on Travis. So we skip them.
if testutil.RaceEnabled {
for _, arg := range os.Args[1:] {
if strings.Contains(arg, "-test.short") {
fmt.Printf("skipping race testing in short mode\n")
os.Exit(0)
}
}
}
}
func TestGenerate(t *testing.T) {
t.Parallel()
checked := make(map[string]bool)
for _, target := range prog.AllTargets() {
target := target
sysTarget := targets.Get(target.OS, target.Arch)
if runtime.GOOS != sysTarget.BuildOS {
continue
}
t.Run(target.OS+"/"+target.Arch, func(t *testing.T) {
full := !checked[target.OS]
if !full && testing.Short() {
return
}
if err := sysTarget.BrokenCompiler; err != "" {
t.Skipf("target compiler is broken: %v", err)
}
checked[target.OS] = true
t.Parallel()
testTarget(t, target, full)
testPseudoSyscalls(t, target)
})
}
}
func testPseudoSyscalls(t *testing.T, target *prog.Target) {
// Use options that are as minimal as possible.
// We want to ensure that the code can always be compiled.
opts := Options{
Slowdown: 1,
}
rs := testutil.RandSource(t)
for _, meta := range target.PseudoSyscalls() {
p := target.GenSampleProg(meta, rs)
t.Run(fmt.Sprintf("single_%s", meta.CallName), func(t *testing.T) {
t.Parallel()
testOne(t, p, opts)
})
}
}
func testTarget(t *testing.T, target *prog.Target, full bool) {
rs := testutil.RandSource(t)
p := target.Generate(rs, 10, target.DefaultChoiceTable())
// Turns out that fully minimized program can trigger new interesting warnings,
// e.g. about NULL arguments for functions that require non-NULL arguments in syz_ functions.
// We could append both AllSyzProg as-is and a minimized version of it,
// but this makes the NULL argument warnings go away (they showed up in ".constprop" versions).
// Testing 2 programs takes too long since we have lots of options permutations and OS/arch.
// So we use the as-is in short tests and minimized version in full tests.
syzProg := target.GenerateAllSyzProg(rs)
var opts []Options
if !full || testing.Short() {
p.Calls = append(p.Calls, syzProg.Calls...)
opts = allOptionsSingle(target.OS)
opts = append(opts, ExecutorOpts)
} else {
minimized, _ := prog.Minimize(syzProg, -1, false, func(p *prog.Prog, call int) bool {
return len(p.Calls) == len(syzProg.Calls)
})
p.Calls = append(p.Calls, minimized.Calls...)
opts = allOptionsPermutations(target.OS)
}
// Test various call properties.
if len(p.Calls) > 0 {
p.Calls[0].Props.FailNth = 1
}
if len(p.Calls) > 1 {
p.Calls[1].Props.Async = true
}
if len(p.Calls) > 2 {
p.Calls[2].Props.Rerun = 4
}
for opti, opts := range opts {
if testing.Short() && opts.HandleSegv {
// HandleSegv can radically increase compilation time/memory consumption on large programs.
// For example, for one program captured from this test enabling HandleSegv increases
// compilation time from 1.94s to 104.73s and memory consumption from 136MB to 8116MB.
continue
}
opts := opts
t.Run(fmt.Sprintf("%v", opti), func(t *testing.T) {
t.Parallel()
testOne(t, p, opts)
})
}
}
var failedTests uint32
func testOne(t *testing.T, p *prog.Prog, opts Options) {
// Each failure produces lots of output (including full C source).
// Frequently lots of tests fail at the same, which produces/tmp/log
// tens of thounds of lines of output. Limit amount of output.
maxFailures := uint32(10)
if os.Getenv("CI") != "" {
maxFailures = 1
}
if atomic.LoadUint32(&failedTests) > maxFailures {
return
}
src, err := Write(p, opts)
if err != nil {
if atomic.AddUint32(&failedTests, 1) > maxFailures {
t.Fatal()
}
t.Logf("opts: %+v\nprogram:\n%s\n", opts, p.Serialize())
t.Fatalf("%v", err)
}
bin, err := Build(p.Target, src)
if err != nil {
if atomic.AddUint32(&failedTests, 1) > maxFailures {
t.Fatal()
}
t.Logf("opts: %+v\nprogram:\n%s\n", opts, p.Serialize())
t.Fatalf("%v", err)
}
defer os.Remove(bin)
}
func TestExecutorMacros(t *testing.T) {
// Ensure that executor does not mis-spell any of the SYZ_* macros.
target, _ := prog.GetTarget(targets.TestOS, targets.TestArch64)
p := target.Generate(rand.NewSource(0), 1, target.DefaultChoiceTable())
expected := commonDefines(p, Options{})
expected["SYZ_EXECUTOR"] = true
expected["SYZ_HAVE_SETUP_LOOP"] = true
expected["SYZ_HAVE_RESET_LOOP"] = true
expected["SYZ_HAVE_SETUP_TEST"] = true
expected["SYZ_TEST_COMMON_EXT_EXAMPLE"] = true
macros := regexp.MustCompile("SYZ_[A-Za-z0-9_]+").FindAllString(commonHeader, -1)
for _, macro := range macros {
if strings.HasPrefix(macro, "SYZ_HAVE_") {
continue
}
if _, ok := expected[macro]; !ok {
t.Errorf("unexpected macro: %v", macro)
}
}
}
func TestSource(t *testing.T) {
t.Parallel()
target, err := prog.GetTarget(targets.TestOS, targets.TestArch64)
if err != nil {
t.Fatal(err)
}
type Test struct {
input string
output string
}
tests := []Test{
{
input: `
r0 = csource0(0x1)
csource1(r0)
`,
output: `
res = syscall(SYS_csource0, /*num=*/1);
if (res != -1)
r[0] = res;
syscall(SYS_csource1, /*fd=*/r[0]);
`,
},
{
input: `
csource2(&AUTO="12345678")
csource3(&AUTO)
csource4(&AUTO)
csource5(&AUTO)
csource6(&AUTO)
`,
output: fmt.Sprintf(`
NONFAILING(memcpy((void*)0x%x, "\x12\x34\x56\x78", 4));
syscall(SYS_csource2, /*buf=*/0x%xul);
NONFAILING(memset((void*)0x%x, 0, 10));
syscall(SYS_csource3, /*buf=*/0x%xul);
NONFAILING(memset((void*)0x%x, 48, 10));
syscall(SYS_csource4, /*buf=*/0x%xul);
NONFAILING(memcpy((void*)0x%x, "0101010101", 10));
syscall(SYS_csource5, /*buf=*/0x%xul);
NONFAILING(memcpy((void*)0x%x, "101010101010", 12));
syscall(SYS_csource6, /*buf=*/0x%xul);
`,
target.DataOffset+0x40, target.DataOffset+0x40,
target.DataOffset+0x80, target.DataOffset+0x80,
target.DataOffset+0xc0, target.DataOffset+0xc0,
target.DataOffset+0x100, target.DataOffset+0x100,
target.DataOffset+0x140, target.DataOffset+0x140),
},
{
input: `
csource7(0x0)
csource7(0x1)
csource7(0x2)
csource7(0x3)
csource7(0x4)
csource7(0x5)
`,
output: `
syscall(SYS_csource7, /*flag=*/0ul);
syscall(SYS_csource7, /*flag=BIT_0*/1ul);
syscall(SYS_csource7, /*flag=BIT_1*/2ul);
syscall(SYS_csource7, /*flag=BIT_0_AND_1*/3ul);
syscall(SYS_csource7, /*flag=*/4ul);
syscall(SYS_csource7, /*flag=BIT_0|0x4*/5ul);
`,
},
}
for i, test := range tests {
t.Run(fmt.Sprint(i), func(t *testing.T) {
p, err := target.Deserialize([]byte(test.input), prog.Strict)
if err != nil {
t.Fatal(err)
}
ctx := &context{
p: p,
target: target,
sysTarget: targets.Get(target.OS, target.Arch),
}
calls, _, err := ctx.generateProgCalls(p, false)
if err != nil {
t.Fatal(err)
}
got := regexp.MustCompile(`(\n|^)\t`).ReplaceAllString(strings.Join(calls, ""), "\n")
if test.output != got {
t.Fatalf("input:\n%v\nwant:\n%v\ngot:\n%v", test.input, test.output, got)
}
})
}
}
func generateSandboxFunctionSignatureTestCase(t *testing.T, sandbox string, sandboxArg int, expected, message string) {
actual := generateSandboxFunctionSignature(sandbox, sandboxArg)
assert.Equal(t, actual, expected, message)
}
func TestGenerateSandboxFunctionSignature(t *testing.T) {
// This test-case intentionally omits the following edge cases:
// - sandbox name as whitespaces, tabs
// - control chars \r, \n and unprintables
// - unsuitable chars - punctuation, emojis, '#', '*', etc
// - character case mismatching function prototype defined in common_linux.h.
// For example 'do_sandbox_android' and 'AnDroid'.
// - non english letters, unicode compound characters
// and focuses on correct handling of sandboxes supporting and not 'sandbox_arg'
// config setting.
generateSandboxFunctionSignatureTestCase(t,
"", // sandbox name
0, // sandbox arg
"loop();", // expected
"Empty sandbox name should produce 'loop();'")
generateSandboxFunctionSignatureTestCase(t,
"abrakadabra", // sandbox name
0, // sandbox arg
"do_sandbox_abrakadabra();", // expected
"Empty sandbox name should produce 'loop();'")
generateSandboxFunctionSignatureTestCase(t,
"android", // sandbox name
-1234, // sandbox arg
"do_sandbox_android(-1234);", // expected
"Android sandbox function requires an argument")
}
|
