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out-of-tree/pew.go

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// Copyright 2023 Mikhail Klementev. All rights reserved.
// Use of this source code is governed by a AGPLv3 license
// (or later) that can be found in the LICENSE file.
package main
import (
"bufio"
"database/sql"
"errors"
"fmt"
"io"
"io/ioutil"
"math/rand"
"os"
"os/exec"
"strings"
"time"
"github.com/otiai10/copy"
"github.com/remeh/sizedwaitgroup"
"github.com/rs/zerolog"
"github.com/rs/zerolog/log"
"gopkg.in/logrusorgru/aurora.v2"
"code.dumpstack.io/tools/out-of-tree/config"
"code.dumpstack.io/tools/out-of-tree/qemu"
)
type PewCmd struct {
Max int64 `help:"test no more than X kernels" default:"100500"`
Runs int64 `help:"runs per each kernel" default:"1"`
Kernel string `help:"override kernel regex"`
Guess bool `help:"try all defined kernels"`
Shuffle bool `help:"randomize kernels test order"`
Binary string `help:"use binary, do not build"`
Test string `help:"override path for test"`
Dist string `help:"build result path" default:"/dev/null"`
Threads int `help:"threads" default:"1"`
Tag string `help:"log tagging"`
Timeout time.Duration `help:"timeout after tool will not spawn new tests"`
ArtifactConfig string `help:"path to artifact config" type:"path"`
QemuTimeout time.Duration `help:"timeout for qemu"`
DockerTimeout time.Duration `help:"timeout for docker"`
Threshold float64 `help:"reliablity threshold for exit code" default:"1.00"`
db *sql.DB
kcfg config.KernelConfig
timeoutDeadline time.Time
}
func (cmd *PewCmd) Run(g *Globals) (err error) {
cmd.kcfg, err = config.ReadKernelConfig(g.Config.Kernels)
if err != nil {
log.Fatal().Err(err).Msg("read kernels config")
}
if cmd.Timeout != 0 {
log.Info().Msgf("Set global timeout to %s", cmd.Timeout)
cmd.timeoutDeadline = time.Now().Add(cmd.Timeout)
}
cmd.db, err = openDatabase(g.Config.Database)
if err != nil {
log.Fatal().Err(err).
Msgf("Cannot open database %s", g.Config.Database)
}
defer cmd.db.Close()
var configPath string
if cmd.ArtifactConfig == "" {
configPath = g.WorkDir + "/.out-of-tree.toml"
} else {
configPath = cmd.ArtifactConfig
}
ka, err := config.ReadArtifactConfig(configPath)
if err != nil {
return
}
if ka.SourcePath == "" {
ka.SourcePath = g.WorkDir
}
if cmd.Kernel != "" {
var km config.KernelMask
km, err = kernelMask(cmd.Kernel)
if err != nil {
return
}
ka.SupportedKernels = []config.KernelMask{km}
}
if cmd.Guess {
ka.SupportedKernels, err = genAllKernels()
if err != nil {
return
}
}
if cmd.QemuTimeout != 0 {
log.Info().Msgf("Set qemu timeout to %s", cmd.QemuTimeout)
} else {
cmd.QemuTimeout = g.Config.Qemu.Timeout.Duration
}
if cmd.DockerTimeout != 0 {
log.Info().Msgf("Set docker timeout to %s", cmd.DockerTimeout)
} else {
cmd.DockerTimeout = g.Config.Docker.Timeout.Duration
}
if cmd.Tag == "" {
cmd.Tag = fmt.Sprintf("%d", time.Now().Unix())
}
log.Info().Str("tag", cmd.Tag).Msg("log")
err = cmd.performCI(ka)
if err != nil {
return
}
log.Info().Msgf("Success rate: %.02f, Threshold: %.02f",
successRate(state), cmd.Threshold)
if successRate(state) < cmd.Threshold {
err = errors.New("reliability threshold not met")
}
return
}
type runstate struct {
Overall, Success float64
}
var (
state runstate
)
func successRate(state runstate) float64 {
return state.Success / state.Overall
}
const pathDevNull = "/dev/null"
func sh(workdir, command string) (output string, err error) {
flog := log.With().
Str("workdir", workdir).
Str("command", command).
Logger()
cmd := exec.Command("sh", "-c", "cd "+workdir+" && "+command)
flog.Debug().Msgf("%v", cmd)
stdout, err := cmd.StdoutPipe()
if err != nil {
return
}
cmd.Stderr = cmd.Stdout
err = cmd.Start()
if err != nil {
return
}
go func() {
scanner := bufio.NewScanner(stdout)
for scanner.Scan() {
m := scanner.Text()
output += m + "\n"
flog.Trace().Str("stdout", m).Msg("")
}
}()
err = cmd.Wait()
if err != nil {
e := fmt.Sprintf("%v %v output: %v", cmd, err, output)
err = errors.New(e)
}
return
}
func applyPatches(src string, ka config.Artifact) (err error) {
for i, patch := range ka.Patches {
name := fmt.Sprintf("patch_%02d", i)
path := src + "/" + name + ".diff"
if patch.Source != "" && patch.Path != "" {
err = errors.New("path and source are mutually exclusive")
return
} else if patch.Source != "" {
err = os.WriteFile(path, []byte(patch.Source), 0644)
if err != nil {
return
}
} else if patch.Path != "" {
err = copy.Copy(patch.Path, path)
if err != nil {
return
}
}
if patch.Source != "" || patch.Path != "" {
_, err = sh(src, "patch < "+path)
if err != nil {
return
}
}
if patch.Script != "" {
script := src + "/" + name + ".sh"
err = os.WriteFile(script, []byte(patch.Script), 0755)
if err != nil {
return
}
_, err = sh(src, script)
if err != nil {
return
}
}
}
return
}
func build(tmp string, ka config.Artifact, ki config.KernelInfo,
dockerTimeout time.Duration) (outdir, outpath, output string, err error) {
target := fmt.Sprintf("%d_%s", rand.Int(), ki.KernelRelease)
outdir = tmp + "/source"
err = copy.Copy(ka.SourcePath, outdir)
if err != nil {
return
}
err = applyPatches(outdir, ka)
if err != nil {
return
}
outpath = outdir + "/" + target
if ka.Type == config.KernelModule {
outpath += ".ko"
}
kernel := "/lib/modules/" + ki.KernelRelease + "/build"
if ki.KernelSource != "" {
kernel = ki.KernelSource
}
buildCommand := "make KERNEL=" + kernel + " TARGET=" + target
if ka.Make.Target != "" {
buildCommand += " " + ka.Make.Target
}
if ki.ContainerName != "" {
var c container
c, err = NewContainer(ki.ContainerName, dockerTimeout)
if err != nil {
log.Fatal().Err(err).Msg("container creation failure")
}
output, err = c.Run(outdir, buildCommand+" && chmod -R 777 /work")
} else {
cmd := exec.Command("bash", "-c", "cd "+outdir+" && "+
buildCommand)
log.Debug().Msgf("%v", cmd)
timer := time.AfterFunc(dockerTimeout, func() {
cmd.Process.Kill()
})
defer timer.Stop()
var raw []byte
raw, err = cmd.CombinedOutput()
if err != nil {
e := fmt.Sprintf("error `%v` for cmd `%v` with output `%v`",
err, buildCommand, string(raw))
err = errors.New(e)
return
}
output = string(raw)
}
return
}
func runScript(q *qemu.System, script string) (output string, err error) {
return q.Command("root", script)
}
func testKernelModule(q *qemu.System, ka config.Artifact,
test string) (output string, err error) {
output, err = q.Command("root", test)
// TODO generic checks for WARNING's and so on
return
}
func testKernelExploit(q *qemu.System, ka config.Artifact,
test, exploit string) (output string, err error) {
output, err = q.Command("user", "chmod +x "+exploit)
if err != nil {
return
}
randFilePath := fmt.Sprintf("/root/%d", rand.Int())
cmd := fmt.Sprintf("%s %s %s", test, exploit, randFilePath)
output, err = q.Command("user", cmd)
if err != nil {
return
}
_, err = q.Command("root", "stat "+randFilePath)
if err != nil {
return
}
return
}
func genOkFail(name string, ok bool) (aurv aurora.Value) {
state.Overall += 1
s := " " + name
if name == "" {
s = ""
}
if ok {
state.Success += 1
s += " SUCCESS "
aurv = aurora.BgGreen(aurora.Black(s))
} else {
s += " FAILURE "
aurv = aurora.BgRed(aurora.White(aurora.Bold(s)))
}
return
}
type phasesResult struct {
BuildDir string
BuildArtifact string
Build, Run, Test struct {
Output string
Ok bool
}
}
func copyFile(sourcePath, destinationPath string) (err error) {
sourceFile, err := os.Open(sourcePath)
if err != nil {
return
}
defer sourceFile.Close()
destinationFile, err := os.Create(destinationPath)
if err != nil {
return err
}
if _, err := io.Copy(destinationFile, sourceFile); err != nil {
destinationFile.Close()
return err
}
return destinationFile.Close()
}
func dumpResult(q *qemu.System, ka config.Artifact, ki config.KernelInfo,
res *phasesResult, dist, tag, binary string, db *sql.DB) {
// TODO merge (problem is it's not 100% same) with log.go:logLogEntry
distroInfo := fmt.Sprintf("%s-%s {%s}", ki.DistroType,
ki.DistroRelease, ki.KernelRelease)
colored := ""
switch ka.Type {
case config.KernelExploit:
colored = aurora.Sprintf("[*] %40s: %s %s", distroInfo,
genOkFail("BUILD", res.Build.Ok),
genOkFail("LPE", res.Test.Ok))
case config.KernelModule:
colored = aurora.Sprintf("[*] %40s: %s %s %s", distroInfo,
genOkFail("BUILD", res.Build.Ok),
genOkFail("INSMOD", res.Run.Ok),
genOkFail("TEST", res.Test.Ok))
case config.Script:
colored = aurora.Sprintf("[*] %40s: %s", distroInfo,
genOkFail("", res.Test.Ok))
}
additional := ""
if q.KernelPanic {
additional = "(panic)"
} else if q.KilledByTimeout {
additional = "(timeout)"
}
if additional != "" {
fmt.Println(colored, additional)
} else {
fmt.Println(colored)
}
err := addToLog(db, q, ka, ki, res, tag)
if err != nil {
log.Warn().Err(err).Msgf("[db] addToLog (%v)", ka)
}
if binary == "" && dist != pathDevNull {
err = os.MkdirAll(dist, os.ModePerm)
if err != nil {
log.Warn().Err(err).Msgf("os.MkdirAll (%v)", ka)
}
path := fmt.Sprintf("%s/%s-%s-%s", dist, ki.DistroType,
ki.DistroRelease, ki.KernelRelease)
if ka.Type != config.KernelExploit {
path += ".ko"
}
err = copyFile(res.BuildArtifact, path)
if err != nil {
log.Warn().Err(err).Msgf("copy file (%v)", ka)
}
}
}
func copyArtifactAndTest(slog zerolog.Logger, q *qemu.System, ka config.Artifact,
res *phasesResult, remoteTest string) (err error) {
// Copy all test files to the remote machine
for _, f := range ka.TestFiles {
if f.Local[0] != '/' {
if res.BuildDir != "" {
f.Local = res.BuildDir + "/" + f.Local
}
}
err = q.CopyFile(f.User, f.Local, f.Remote)
if err != nil {
slog.Error().Err(err).Msg("copy test file")
return
}
}
switch ka.Type {
case config.KernelModule:
res.Run.Output, err = q.CopyAndInsmod(res.BuildArtifact)
if err != nil {
slog.Error().Err(err).Msg(res.Run.Output)
return
}
res.Run.Ok = true
res.Test.Output, err = testKernelModule(q, ka, remoteTest)
if err != nil {
slog.Error().Err(err).Msg(res.Test.Output)
return
}
res.Test.Ok = true
case config.KernelExploit:
remoteExploit := fmt.Sprintf("/tmp/exploit_%d", rand.Int())
err = q.CopyFile("user", res.BuildArtifact, remoteExploit)
if err != nil {
return
}
res.Test.Output, err = testKernelExploit(q, ka, remoteTest,
remoteExploit)
if err != nil {
slog.Error().Err(err).Msg(res.Test.Output)
return
}
res.Run.Ok = true // does not really used
res.Test.Ok = true
case config.Script:
res.Test.Output, err = runScript(q, remoteTest)
if err != nil {
slog.Error().Err(err).Msg(res.Test.Output)
return
}
slog.Info().Msg(res.Test.Output)
res.Run.Ok = true
res.Test.Ok = true
default:
slog.Fatal().Msg("Unsupported artifact type")
}
return
}
func copyTest(q *qemu.System, testPath string, ka config.Artifact) (
remoteTest string, err error) {
remoteTest = fmt.Sprintf("/tmp/test_%d", rand.Int())
err = q.CopyFile("user", testPath, remoteTest)
if err != nil {
if ka.Type == config.KernelExploit {
q.Command("user",
"echo -e '#!/bin/sh\necho touch $2 | $1' "+
"> "+remoteTest+
" && chmod +x "+remoteTest)
} else {
q.Command("user", "echo '#!/bin/sh' "+
"> "+remoteTest+" && chmod +x "+remoteTest)
}
}
_, err = q.Command("root", "chmod +x "+remoteTest)
return
}
func copyStandardModules(q *qemu.System, ki config.KernelInfo) (err error) {
_, err = q.Command("root", "mkdir -p /lib/modules")
if err != nil {
return
}
files, err := ioutil.ReadDir(ki.ModulesPath)
if err != nil {
return
}
// FIXME scp cannot ignore symlinks
for _, f := range files {
if f.Mode()&os.ModeSymlink == os.ModeSymlink {
continue
}
path := ki.ModulesPath + "/" + f.Name()
err = q.CopyDirectory("root", path, "/lib/modules/"+ki.KernelRelease+"/")
if err != nil {
return
}
}
return
}
func (cmd PewCmd) testArtifact(swg *sizedwaitgroup.SizedWaitGroup,
ka config.Artifact, ki config.KernelInfo) {
defer swg.Done()
slog := log.With().
Str("distro_type", ki.DistroType.String()).
Str("distro_release", ki.DistroRelease).
Str("kernel", ki.KernelRelease).
Logger()
slog.Info().Msg("start")
kernel := qemu.Kernel{KernelPath: ki.KernelPath, InitrdPath: ki.InitrdPath}
q, err := qemu.NewSystem(qemu.X86x64, kernel, ki.RootFS)
if err != nil {
slog.Error().Err(err).Msg("qemu init")
return
}
q.Timeout = cmd.QemuTimeout
if ka.Qemu.Timeout.Duration != 0 {
q.Timeout = ka.Qemu.Timeout.Duration
}
if ka.Qemu.Cpus != 0 {
q.Cpus = ka.Qemu.Cpus
}
if ka.Qemu.Memory != 0 {
q.Memory = ka.Qemu.Memory
}
if ka.Docker.Timeout.Duration != 0 {
cmd.DockerTimeout = ka.Docker.Timeout.Duration
}
q.SetKASLR(!ka.Mitigations.DisableKaslr)
q.SetSMEP(!ka.Mitigations.DisableSmep)
q.SetSMAP(!ka.Mitigations.DisableSmap)
q.SetKPTI(!ka.Mitigations.DisableKpti)
err = q.Start()
if err != nil {
slog.Error().Err(err).Msg("qemu start")
return
}
defer q.Stop()
go func() {
for !q.Died {
time.Sleep(time.Minute)
slog.Debug().Msg("still alive")
}
}()
tmp, err := ioutil.TempDir(tempDirBase, "out-of-tree_")
if err != nil {
slog.Error().Err(err).Msg("making tmp directory")
return
}
defer os.RemoveAll(tmp)
result := phasesResult{}
defer dumpResult(q, ka, ki, &result, cmd.Dist, cmd.Tag, cmd.Binary, cmd.db)
if ka.Type == config.Script {
result.Build.Ok = true
cmd.Test = ka.Script
} else if cmd.Binary == "" {
// TODO: build should return structure
start := time.Now()
result.BuildDir, result.BuildArtifact, result.Build.Output, err =
build(tmp, ka, ki, cmd.DockerTimeout)
slog.Debug().Str("duration", time.Now().Sub(start).String()).
Msg("build done")
if err != nil {
log.Error().Err(err).Msg("build")
return
}
result.Build.Ok = true
} else {
result.BuildArtifact = cmd.Binary
result.Build.Ok = true
}
if cmd.Test == "" {
cmd.Test = result.BuildArtifact + "_test"
if !exists(cmd.Test) {
cmd.Test = tmp + "/source/" + "test.sh"
}
}
err = q.WaitForSSH(cmd.QemuTimeout)
if err != nil {
return
}
remoteTest, err := copyTest(q, cmd.Test, ka)
if err != nil {
return
}
if ka.StandardModules {
// Module depends on one of the standard modules
start := time.Now()
err = copyStandardModules(q, ki)
if err != nil {
slog.Fatal().Err(err).Msg("copy standard modules")
return
}
slog.Debug().Str("duration", time.Now().Sub(start).String()).
Msg("copy standard modules")
}
err = preloadModules(q, ka, ki, cmd.DockerTimeout)
if err != nil {
slog.Error().Err(err).Msg("preload modules")
return
}
start := time.Now()
copyArtifactAndTest(slog, q, ka, &result, remoteTest)
slog.Debug().Str("duration", time.Now().Sub(start).String()).
Msg("test completed")
}
func shuffleKernels(a []config.KernelInfo) []config.KernelInfo {
// FisherYates shuffle
for i := len(a) - 1; i > 0; i-- {
j := rand.Intn(i + 1)
a[i], a[j] = a[j], a[i]
}
return a
}
func (cmd PewCmd) performCI(ka config.Artifact) (err error) {
found := false
max := cmd.Max
swg := sizedwaitgroup.New(cmd.Threads)
if cmd.Shuffle {
cmd.kcfg.Kernels = shuffleKernels(cmd.kcfg.Kernels)
}
for _, kernel := range cmd.kcfg.Kernels {
if max <= 0 {
break
}
var supported bool
supported, err = ka.Supported(kernel)
if err != nil {
return
}
if supported {
found = true
max--
for i := int64(0); i < cmd.Runs; i++ {
if !cmd.timeoutDeadline.IsZero() &&
time.Now().After(cmd.timeoutDeadline) {
break
}
swg.Add()
go cmd.testArtifact(&swg, ka, kernel)
}
}
}
swg.Wait()
if !found {
err = errors.New("No supported kernels found")
}
return
}
func exists(path string) bool {
if _, err := os.Stat(path); err != nil {
log.Debug().Msgf("%s does not exist", path)
return false
}
log.Debug().Msgf("%s exist", path)
return true
}
func kernelMask(kernel string) (km config.KernelMask, err error) {
parts := strings.Split(kernel, ":")
if len(parts) != 2 {
err = errors.New("Kernel is not 'distroType:regex'")
return
}
dt, err := config.NewDistroType(parts[0])
if err != nil {
return
}
km = config.KernelMask{DistroType: dt, ReleaseMask: parts[1]}
return
}
func genAllKernels() (sk []config.KernelMask, err error) {
for _, dType := range config.DistroTypeStrings {
var dt config.DistroType
dt, err = config.NewDistroType(dType)
if err != nil {
return
}
sk = append(sk, config.KernelMask{
DistroType: dt,
ReleaseMask: ".*",
})
}
return
}