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How to use Serialize method of kconfig Package

Best Syzkaller code snippet using kconfig.Serialize

linux.go

Source:linux.go

...123	}124	linuxAlterConfigs(cf, tags)125	env := &BisectEnv{126		Compiler:     filepath.Join(binDir, "gcc-"+linuxCompilerVersion(tags), "bin", "gcc"),127		KernelConfig: cf.Serialize(),128	}129	// v4.0 doesn't boot with our config nor with defconfig, it halts on an interrupt in x86_64_start_kernel.130	if !tags["v4.1"] {131		_, err := ctx.git.git("cherry-pick", "--no-commit", "99124e4db5b7b70daeaaf1d88a6a8078a0004c6e")132		if err != nil {133			return nil, err134		}135	}136	return env, nil137}138func linuxCompilerVersion(tags map[string]bool) string {139	switch {140	case tags["v5.9"]:141		return "10.1.0"142	case tags["v4.12"]:143		return "8.1.0"144	case tags["v4.11"]:145		return "7.3.0"146	default:147		return "5.5.0"148	}149}150func linuxAlterConfigs(cf *kconfig.ConfigFile, tags map[string]bool) {151	const disableAlways = "disable-always"152	// If tags is nil, disable only configs marked as disableAlways.153	checkTag := func(tag string) bool {154		return tags != nil && !tags[tag] ||155			tags == nil && tag == disableAlways156	}157	disable := map[string]string{158		// 5.2 has CONFIG_SECURITY_TOMOYO_INSECURE_BUILTIN_SETTING which allows to test tomoyo better.159		// This config also enables CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER160		// but we need it disabled to boot older kernels.161		"SECURITY_TOMOYO_OMIT_USERSPACE_LOADER": "v5.2",162		// Kernel is boot broken before 4.15 due to double-free in vudc_probe:163		// https://lkml.org/lkml/2018/9/7/648164		// Fixed by e28fd56ad5273be67d0fae5bedc7e1680e729952.165		"USBIP_VUDC": "v4.15",166		// CONFIG_CAN causes:167		// all runs: crashed: INFO: trying to register non-static key in can_notifier168		// for v4.11..v4.12 and v4.12..v4.13 ranges.169		// Fixed by 74b7b490886852582d986a33443c2ffa50970169.170		"CAN": "v4.13",171		// Setup of network devices is broken before v4.12 with a "WARNING in hsr_get_node".172		// Fixed by 675c8da049fd6556eb2d6cdd745fe812752f07a8.173		"HSR": "v4.12",174		// Setup of network devices is broken before v4.12 with a "WARNING: ODEBUG bug in __sk_destruct"175		// coming from smc_release.176		"SMC": "v4.12",177		// Kernel is boot broken before 4.10 with a lockdep warning in vhci_hcd_probe.178		"USBIP_VHCI_HCD": "v4.10",179		"BT_HCIVHCI":     "v4.10",180		// Setup of network devices is broken before v4.7 with a deadlock involving team.181		"NET_TEAM": "v4.7",182		// Setup of network devices is broken before v4.5 with a warning in batadv_tvlv_container_remove.183		"BATMAN_ADV": "v4.5",184		// UBSAN is broken in multiple ways before v5.3, see:185		// https://github.com/google/syzkaller/issues/1523#issuecomment-696514105186		"UBSAN": "v5.3",187		// First, we disable coverage in pkg/bisect because it fails machine testing starting from 4.7.188		// Second, at 6689da155bdcd17abfe4d3a8b1e245d9ed4b5f2c CONFIG_KCOV selects CONFIG_GCC_PLUGIN_SANCOV189		// (why?), which is build broken for hundreds of revisions.190		"KCOV": disableAlways,191		// This helps to produce stable binaries in presence of kernel tag changes.192		"LOCALVERSION_AUTO": disableAlways,193		// BTF fails lots of builds with:194		// pahole version v1.9 is too old, need at least v1.13195		// Failed to generate BTF for vmlinux. Try to disable CONFIG_DEBUG_INFO_BTF.196		"DEBUG_INFO_BTF": disableAlways,197		// This config only adds debug output. It should not be enabled at all,198		// but it was accidentially enabled on some instances for some periods of time,199		// and kernel is boot-broken for prolonged ranges of commits with deadlock200		// which makes bisections take weeks.201		"DEBUG_KOBJECT": disableAlways,202		// This config is causing problems to kernel signature calculation as new initramfs is generated203		// as a part of every build. Due to this init.data section containing this generated initramfs204		// is differing between builds causing signture being random number.205		"BLK_DEV_INITRD": disableAlways,206	}207	for cfg, tag := range disable {208		if checkTag(tag) {209			cf.Unset(cfg)210		}211	}212	alter := []struct {213		From string214		To   string215		Tag  string216	}{217		// Even though ORC unwinder was introduced a long time ago, it might have been broken for218		// some time. 5.4 is chosen as a version tag, where ORC unwinder seems to work properly.219		{"UNWINDER_ORC", "UNWINDER_FRAME_POINTER", "v5.4"},220	}221	for _, a := range alter {222		if checkTag(a.Tag) {223			cf.Unset(a.From)224			cf.Set(a.To, kconfig.Yes)225		}226	}227}228func (ctx *linux) Bisect(bad, good string, dt debugtracer.DebugTracer, pred func() (BisectResult,229	error)) ([]*Commit, error) {230	commits, err := ctx.git.Bisect(bad, good, dt, pred)231	if len(commits) == 1 {232		ctx.addMaintainers(commits[0])233	}234	return commits, err235}236func (ctx *linux) addMaintainers(com *Commit) {237	if len(com.Recipients) > 2 {238		return239	}240	mtrs := ctx.getMaintainers(com.Hash, false)241	if len(mtrs) < 3 {242		mtrs = ctx.getMaintainers(com.Hash, true)243	}244	com.Recipients = append(com.Recipients, mtrs...)245	sort.Sort(com.Recipients)246}247func (ctx *linux) getMaintainers(hash string, blame bool) Recipients {248	// See #1441 re --git-min-percent.249	args := "git show " + hash + " | " +250		filepath.FromSlash("scripts/get_maintainer.pl") +251		" --git-min-percent=20"252	if blame {253		args += " --git-blame"254	}255	output, err := osutil.RunCmd(time.Minute, ctx.git.dir, "bash", "-c", args)256	if err != nil {257		return nil258	}259	return ParseMaintainersLinux(output)260}261func ParseMaintainersLinux(text []byte) Recipients {262	lines := strings.Split(string(text), "\n")263	reRole := regexp.MustCompile(` \([^)]+\)$`)264	var mtrs Recipients265	// LMKL is To by default, but it changes to Cc if there's also a subsystem list.266	lkmlType := To267	foundLkml := false268	for _, line := range lines {269		role := reRole.FindString(line)270		address := strings.Replace(line, role, "", 1)271		addr, err := mail.ParseAddress(address)272		if err != nil {273			continue274		}275		var roleType RecipientType276		if addr.Address == "linux-kernel@vger.kernel.org" {277			foundLkml = true278			continue279		} else if strings.Contains(role, "list") {280			lkmlType = Cc281			roleType = To282		} else if strings.Contains(role, "maintainer") || strings.Contains(role, "supporter") {283			roleType = To284		} else {285			roleType = Cc // Reviewer or other role; default to Cc.286		}287		mtrs = append(mtrs, RecipientInfo{*addr, roleType})288	}289	if foundLkml {290		mtrs = append(mtrs, RecipientInfo{mail.Address{Address: "linux-kernel@vger.kernel.org"}, lkmlType})291	}292	sort.Sort(mtrs)293	return mtrs294}295const configBisectTag = "# Minimized by syzkaller"296func (ctx *linux) Minimize(target *targets.Target, original, baseline []byte,297	dt debugtracer.DebugTracer, pred func(test []byte) (BisectResult, error)) ([]byte, error) {298	if bytes.HasPrefix(original, []byte(configBisectTag)) {299		dt.Log("# configuration already minimized\n")300		return original, nil301	}302	kconf, err := kconfig.Parse(target, filepath.Join(ctx.git.dir, "Kconfig"))303	if err != nil {304		return nil, fmt.Errorf("failed to parse Kconfig: %v", err)305	}306	originalConfig, err := kconfig.ParseConfigData(original, "original")307	if err != nil {308		return nil, err309	}310	baselineConfig, err := kconfig.ParseConfigData(baseline, "baseline")311	if err != nil {312		return nil, err313	}314	linuxAlterConfigs(originalConfig, nil)315	linuxAlterConfigs(baselineConfig, nil)316	kconfPred := func(candidate *kconfig.ConfigFile) (bool, error) {317		res, err := pred(serialize(candidate))318		return res == BisectBad, err319	}320	minConfig, err := kconf.Minimize(baselineConfig, originalConfig, kconfPred, dt)321	if err != nil {322		return nil, err323	}324	return serialize(minConfig), nil325}326func serialize(cf *kconfig.ConfigFile) []byte {327	return []byte(fmt.Sprintf("%v, rev: %v\n%s", configBisectTag, prog.GitRevision, cf.Serialize()))328}...

minconfig.go

Source:minconfig.go

...52	res, err := kconf.Minimize(base, full, pred, gt)53	if err != nil {54		tool.Fail(err)55	}56	os.Stdout.Write(res.Serialize())57}...

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