fuzz/fuzz_common.go - LeafOS-Project/android_build_soong - Gitiles

 // Copyright 2021 Google Inc. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

 package fuzz

 // This file contains the common code for compiling C/C++ and Rust fuzzers for Android.

 import (
 	"encoding/json"
 	"fmt"
 	"sort"
 	"strings"

 	"github.com/google/blueprint/proptools"

 	"android/soong/android"
 )

 type Lang string

 const (
 	Cc   Lang = "cc"
 	Rust Lang = "rust"
 	Java Lang = "java"
 )

 type Framework string

 const (
 	AFL              Framework = "afl"
 	LibFuzzer        Framework = "libfuzzer"
 	Jazzer           Framework = "jazzer"
 	UnknownFramework Framework = "unknownframework"
 )

 var BoolDefault = proptools.BoolDefault

 type FuzzModule struct {
 	android.ModuleBase
 	android.DefaultableModuleBase
 	android.ApexModuleBase
 }

 type FuzzPackager struct {
 	Packages                android.Paths
 	FuzzTargets             map[string]bool
 	SharedLibInstallStrings []string
 }

 type FileToZip struct {
 	SourceFilePath        android.Path
 	DestinationPathPrefix string
 	DestinationPath       string
 }

 type ArchOs struct {
 	HostOrTarget string
 	Arch         string
 	Dir          string
 }

 type Vector string

 const (
 	unknown_access_vector Vector = "unknown_access_vector"
 	// The code being fuzzed is reachable from a remote source, or using data
 	// provided by a remote source.  For example: media codecs process media files
 	// from the internet, SMS processing handles remote message data.
 	// See
 	// https://source.android.com/docs/security/overview/updates-resources#local-vs-remote
 	// for an explanation of what's considered "remote."
 	remote = "remote"
 	// The code being fuzzed can only be reached locally, such as from an
 	// installed app.  As an example, if it's fuzzing a Binder interface, it's
 	// assumed that you'd need a local app to make arbitrary Binder calls.
 	// And the app that's calling the fuzzed code does not require any privileges;
 	// any 3rd party app could make these calls.
 	local_no_privileges_required = "local_no_privileges_required"
 	// The code being fuzzed can only be called locally, and the calling process
 	// requires additional permissions that prevent arbitrary 3rd party apps from
 	// calling the code.  For instance: this requires a privileged or signature
 	// permission to reach, or SELinux restrictions prevent the untrusted_app
 	// domain from calling it.
 	local_privileges_required = "local_privileges_required"
 	// The code is only callable on a PC host, not on a production Android device.
 	// For instance, this is fuzzing code used during the build process, or
 	// tooling that does not exist on a user's actual Android device.
 	host_access = "host_access"
 	// The code being fuzzed is only reachable if the user has enabled Developer
 	// Options, or has enabled a persistent Developer Options setting.
 	local_with_developer_options = "local_with_developer_options"
 )

 func (vector Vector) isValidVector() bool {
 	switch vector {
 	case "",
 		unknown_access_vector,
 		remote,
 		local_no_privileges_required,
 		local_privileges_required,
 		host_access,
 		local_with_developer_options:
 		return true
 	}
 	return false
 }

 type ServicePrivilege string

 const (
 	unknown_service_privilege ServicePrivilege = "unknown_service_privilege"
 	// The code being fuzzed runs on a Secure Element.  This has access to some
 	// of the most privileged data on the device, such as authentication keys.
 	// Not all devices have a Secure Element.
 	secure_element = "secure_element"
 	// The code being fuzzed runs in the TEE.  The TEE is designed to be resistant
 	// to a compromised kernel, and stores sensitive data.
 	trusted_execution = "trusted_execution"
 	// The code being fuzzed has privileges beyond what arbitrary 3rd party apps
 	// have.  For instance, it's running as the System UID, or it's in an SELinux
 	// domain that's able to perform calls that can't be made by 3rd party apps.
 	privileged = "privileged"
 	// The code being fuzzed is equivalent to a 3rd party app.  It runs in the
 	// untrusted_app SELinux domain, or it only has privileges that are equivalent
 	// to what a 3rd party app could have.
 	unprivileged = "unprivileged"
 	// The code being fuzzed is significantly constrained, and even if it's
 	// compromised, it has significant restrictions that prevent it from
 	// performing most actions.  This is significantly more restricted than
 	// UNPRIVILEGED.  An example is the isolatedProcess=true setting in a 3rd
 	// party app.  Or a process that's very restricted by SELinux, such as
 	// anything in the mediacodec SELinux domain.
 	constrained = "constrained"
 	// The code being fuzzed always has Negligible Security Impact.  Even
 	// arbitrary out of bounds writes and full code execution would not be
 	// considered a security vulnerability.  This typically only makes sense if
 	// FuzzedCodeUsage is set to FUTURE_VERSION or EXPERIMENTAL, and if
 	// AutomaticallyRouteTo is set to ALWAYS_NSI.
 	nsi = "nsi"
 	// The code being fuzzed only runs on a PC host, not on a production Android
 	// device.  For instance, the fuzzer is fuzzing code used during the build
 	// process, or tooling that does not exist on a user's actual Android device.
 	host_only = "host_only"
 )

 func (service_privilege ServicePrivilege) isValidServicePrivilege() bool {
 	switch service_privilege {
 	case "",
 		unknown_service_privilege,
 		secure_element,
 		trusted_execution,
 		privileged,
 		unprivileged,
 		constrained,
 		nsi,
 		host_only:
 		return true
 	}
 	return false
 }

 type UsePlatformLibs string

 const (
 	unknown_use_platform_libs UsePlatformLibs = "unknown_use_platform_libs"
 	// Use the native libraries on the device, typically in /system directory
 	use_platform_libs = "use_platform_libs"
 	// Do not use any native libraries (ART will not be initialized)
 	use_none = "use_none"
 )

 func (use_platform_libs UsePlatformLibs) isValidUsePlatformLibs() bool {
 	switch use_platform_libs {
 	case "",
 		unknown_use_platform_libs,
 		use_platform_libs,
 		use_none:
 		return true
 	}
 	return false
 }

 type UserData string

 const (
 	unknown_user_data UserData = "unknown_user_data"
 	// The process being fuzzed only handles data from a single user, or from a
 	// single process or app.  It's possible the process shuts down before
 	// handling data from another user/process/app, or it's possible the process
 	// only ever handles one user's/process's/app's data.  As an example, some
 	// print spooler processes are started for a single document and terminate
 	// when done, so each instance only handles data from a single user/app.
 	single_user = "single_user"
 	// The process handles data from multiple users, or from multiple other apps
 	// or processes.  Media processes, for instance, can handle media requests
 	// from multiple different apps without restarting.  Wi-Fi and network
 	// processes handle data from multiple users, and processes, and apps.
 	multi_user = "multi_user"
 )

 func (user_data UserData) isValidUserData() bool {
 	switch user_data {
 	case "",
 		unknown_user_data,
 		single_user,
 		multi_user:
 		return true
 	}
 	return false
 }

 type FuzzedCodeUsage string

 const (
 	undefined FuzzedCodeUsage = "undefined"
 	unknown                   = "unknown"
 	// The code being fuzzed exists in a shipped version of Android and runs on
 	// devices in production.
 	shipped = "shipped"
 	// The code being fuzzed is not yet in a shipping version of Android, but it
 	// will be at some point in the future.
 	future_version = "future_version"
 	// The code being fuzzed is not in a shipping version of Android, and there
 	// are no plans to ship it in the future.
 	experimental = "experimental"
 )

 func (fuzzed_code_usage FuzzedCodeUsage) isValidFuzzedCodeUsage() bool {
 	switch fuzzed_code_usage {
 	case "",
 		undefined,
 		unknown,
 		shipped,
 		future_version,
 		experimental:
 		return true
 	}
 	return false
 }

 type AutomaticallyRouteTo string

 const (
 	undefined_routing AutomaticallyRouteTo = "undefined_routing"
 	// Automatically route this to the Android Automotive security team for
 	// assessment.
 	android_automotive = "android_automotive"
 	// This should not be used in fuzzer configurations.  It is used internally
 	// by Severity Assigner to flag memory leak reports.
 	memory_leak = "memory_leak"
 	// Route this vulnerability to our Ittiam vendor team for assessment.
 	ittiam = "ittiam"
 	// Reports from this fuzzer are always NSI (see the NSI ServicePrivilegeEnum
 	// value for additional context).  It is not possible for this code to ever
 	// have a security vulnerability.
 	always_nsi = "always_nsi"
 	// Route this vulnerability to AIDL team for assessment.
 	aidl = "aidl"
 )

 func (automatically_route_to AutomaticallyRouteTo) isValidAutomaticallyRouteTo() bool {
 	switch automatically_route_to {
 	case "",
 		undefined_routing,
 		android_automotive,
 		memory_leak,
 		ittiam,
 		always_nsi,
 		aidl:
 		return true
 	}
 	return false
 }

 func IsValidConfig(fuzzModule FuzzPackagedModule, moduleName string) bool {
 	var config = fuzzModule.FuzzProperties.Fuzz_config
 	if config != nil {
 		if !config.Vector.isValidVector() {
 			panic(fmt.Errorf("Invalid vector in fuzz config in %s", moduleName))
 		}

 		if !config.Service_privilege.isValidServicePrivilege() {
 			panic(fmt.Errorf("Invalid service_privilege in fuzz config in %s", moduleName))
 		}

 		if !config.Users.isValidUserData() {
 			panic(fmt.Errorf("Invalid users (user_data) in fuzz config in %s", moduleName))
 		}

 		if !config.Fuzzed_code_usage.isValidFuzzedCodeUsage() {
 			panic(fmt.Errorf("Invalid fuzzed_code_usage in fuzz config in %s", moduleName))
 		}

 		if !config.Automatically_route_to.isValidAutomaticallyRouteTo() {
 			panic(fmt.Errorf("Invalid automatically_route_to in fuzz config in %s", moduleName))
 		}

 		if !config.Use_platform_libs.isValidUsePlatformLibs() {
 			panic(fmt.Errorf("Invalid use_platform_libs in fuzz config in %s", moduleName))
 		}
 	}
 	return true
 }

 type FuzzConfig struct {
 	// Email address of people to CC on bugs or contact about this fuzz target.
 	Cc []string `json:"cc,omitempty"`
 	// A brief description of what the fuzzed code does.
 	Description string `json:"description,omitempty"`
 	// Whether the code being fuzzed is remotely accessible or requires privileges
 	// to access locally.
 	Vector Vector `json:"vector,omitempty"`
 	// How privileged the service being fuzzed is.
 	Service_privilege ServicePrivilege `json:"service_privilege,omitempty"`
 	// Whether the service being fuzzed handles data from multiple users or only
 	// a single one.
 	Users UserData `json:"users,omitempty"`
 	// Specifies the use state of the code being fuzzed. This state factors into
 	// how an issue is handled.
 	Fuzzed_code_usage FuzzedCodeUsage `json:"fuzzed_code_usage,omitempty"`
 	// Comment describing how we came to these settings for this fuzzer.
 	Config_comment string
 	// Which team to route this to, if it should be routed automatically.
 	Automatically_route_to AutomaticallyRouteTo `json:"automatically_route_to,omitempty"`
 	// Can third party/untrusted apps supply data to fuzzed code.
 	Untrusted_data *bool `json:"untrusted_data,omitempty"`
 	// When code was released or will be released.
 	Production_date string `json:"production_date,omitempty"`
 	// Prevents critical service functionality like phone calls, bluetooth, etc.
 	Critical *bool `json:"critical,omitempty"`
 	// Specify whether to enable continuous fuzzing on devices. Defaults to true.
 	Fuzz_on_haiku_device *bool `json:"fuzz_on_haiku_device,omitempty"`
 	// Specify whether to enable continuous fuzzing on host. Defaults to true.
 	Fuzz_on_haiku_host *bool `json:"fuzz_on_haiku_host,omitempty"`
 	// Component in Google's bug tracking system that bugs should be filed to.
 	Componentid *int64 `json:"componentid,omitempty"`
 	// Hotlist(s) in Google's bug tracking system that bugs should be marked with.
 	Hotlists []string `json:"hotlists,omitempty"`
 	// Specify whether this fuzz target was submitted by a researcher. Defaults
 	// to false.
 	Researcher_submitted *bool `json:"researcher_submitted,omitempty"`
 	// Specify who should be acknowledged for CVEs in the Android Security
 	// Bulletin.
 	Acknowledgement []string `json:"acknowledgement,omitempty"`
 	// Additional options to be passed to libfuzzer when run in Haiku.
 	Libfuzzer_options []string `json:"libfuzzer_options,omitempty"`
 	// Additional options to be passed to HWASAN when running on-device in Haiku.
 	Hwasan_options []string `json:"hwasan_options,omitempty"`
 	// Additional options to be passed to HWASAN when running on host in Haiku.
 	Asan_options []string `json:"asan_options,omitempty"`
 	// If there's a Java fuzzer with JNI, a different version of Jazzer would
 	// need to be added to the fuzzer package than one without JNI
 	IsJni *bool `json:"is_jni,omitempty"`
 	// List of modules for monitoring coverage drops in directories (e.g. "libicu")
 	Target_modules []string `json:"target_modules,omitempty"`
 	// Specifies a bug assignee to replace default ISE assignment
 	Triage_assignee string `json:"triage_assignee,omitempty"`
 	// Specifies libs used to initialize ART (java only, 'use_none' for no initialization)
 	Use_platform_libs UsePlatformLibs `json:"use_platform_libs,omitempty"`
 	// Specifies whether fuzz target should check presubmitted code changes for crashes.
 	// Defaults to false.
 	Use_for_presubmit *bool `json:"use_for_presubmit,omitempty"`
 	// Specify which paths to exclude from fuzzing coverage reports
 	Exclude_paths_from_reports []string `json:"exclude_paths_from_reports,omitempty"`
 }

 type FuzzFrameworks struct {
 	Afl       *bool
 	Libfuzzer *bool
 	Jazzer    *bool
 }

 type FuzzProperties struct {
 	// Optional list of seed files to be installed to the fuzz target's output
 	// directory.
 	Corpus []string `android:"path"`
 	// Optional list of data files to be installed to the fuzz target's output
 	// directory. Directory structure relative to the module is preserved.
 	Data []string `android:"path"`
 	// Optional dictionary to be installed to the fuzz target's output directory.
 	Dictionary *string `android:"path"`
 	// Define the fuzzing frameworks this fuzz target can be built for. If
 	// empty then the fuzz target will be available to be  built for all fuzz
 	// frameworks available
 	Fuzzing_frameworks *FuzzFrameworks
 	// Config for running the target on fuzzing infrastructure.
 	Fuzz_config *FuzzConfig
 }

 type FuzzPackagedModule struct {
 	FuzzProperties FuzzProperties
 	Dictionary     android.Path
 	Corpus         android.Paths
 	Config         android.Path
 	Data           android.Paths
 }

 func GetFramework(ctx android.LoadHookContext, lang Lang) Framework {
 	framework := ctx.Config().Getenv("FUZZ_FRAMEWORK")

 	if lang == Cc {
 		switch strings.ToLower(framework) {
 		case "":
 			return LibFuzzer
 		case "libfuzzer":
 			return LibFuzzer
 		case "afl":
 			return AFL
 		}
 	} else if lang == Rust {
 		return LibFuzzer
 	} else if lang == Java {
 		return Jazzer
 	}

 	ctx.ModuleErrorf(fmt.Sprintf("%s is not a valid fuzzing framework for %s", framework, lang))
 	return UnknownFramework
 }

 func IsValidFrameworkForModule(targetFramework Framework, lang Lang, moduleFrameworks *FuzzFrameworks) bool {
 	if targetFramework == UnknownFramework {
 		return false
 	}

 	if moduleFrameworks == nil {
 		return true
 	}

 	switch targetFramework {
 	case LibFuzzer:
 		return proptools.BoolDefault(moduleFrameworks.Libfuzzer, true)
 	case AFL:
 		return proptools.BoolDefault(moduleFrameworks.Afl, true)
 	case Jazzer:
 		return proptools.BoolDefault(moduleFrameworks.Jazzer, true)
 	default:
 		panic("%s is not supported as a fuzz framework")
 	}
 }

 func IsValid(fuzzModule FuzzModule) bool {
 	// Discard ramdisk + vendor_ramdisk + recovery modules, they're duplicates of
 	// fuzz targets we're going to package anyway.
 	if !fuzzModule.Enabled() || fuzzModule.InRamdisk() || fuzzModule.InVendorRamdisk() || fuzzModule.InRecovery() {
 		return false
 	}

 	// Discard modules that are in an unavailable namespace.
 	if !fuzzModule.ExportedToMake() {
 		return false
 	}

 	return true
 }

 func (s *FuzzPackager) PackageArtifacts(ctx android.SingletonContext, module android.Module, fuzzModule FuzzPackagedModule, archDir android.OutputPath, builder *android.RuleBuilder) []FileToZip {
 	// Package the corpora into a zipfile.
 	var files []FileToZip
 	if fuzzModule.Corpus != nil {
 		corpusZip := archDir.Join(ctx, module.Name()+"_seed_corpus.zip")
 		command := builder.Command().BuiltTool("soong_zip").
 			Flag("-j").
 			FlagWithOutput("-o ", corpusZip)
 		rspFile := corpusZip.ReplaceExtension(ctx, "rsp")
 		command.FlagWithRspFileInputList("-r ", rspFile, fuzzModule.Corpus)
 		files = append(files, FileToZip{SourceFilePath: corpusZip})
 	}

 	// Package the data into a zipfile.
 	if fuzzModule.Data != nil {
 		dataZip := archDir.Join(ctx, module.Name()+"_data.zip")
 		command := builder.Command().BuiltTool("soong_zip").
 			FlagWithOutput("-o ", dataZip)
 		for _, f := range fuzzModule.Data {
 			intermediateDir := strings.TrimSuffix(f.String(), f.Rel())
 			command.FlagWithArg("-C ", intermediateDir)
 			command.FlagWithInput("-f ", f)
 		}
 		files = append(files, FileToZip{SourceFilePath: dataZip})
 	}

 	// The dictionary.
 	if fuzzModule.Dictionary != nil {
 		files = append(files, FileToZip{SourceFilePath: fuzzModule.Dictionary})
 	}

 	// Additional fuzz config.
 	if fuzzModule.Config != nil && IsValidConfig(fuzzModule, module.Name()) {
 		files = append(files, FileToZip{SourceFilePath: fuzzModule.Config})
 	}

 	return files
 }

 func (s *FuzzPackager) BuildZipFile(ctx android.SingletonContext, module android.Module, fuzzModule FuzzPackagedModule, files []FileToZip, builder *android.RuleBuilder, archDir android.OutputPath, archString string, hostOrTargetString string, archOs ArchOs, archDirs map[ArchOs][]FileToZip) ([]FileToZip, bool) {
 	fuzzZip := archDir.Join(ctx, module.Name()+".zip")

 	command := builder.Command().BuiltTool("soong_zip").
 		Flag("-j").
 		FlagWithOutput("-o ", fuzzZip)

 	for _, file := range files {
 		if file.DestinationPathPrefix != "" {
 			command.FlagWithArg("-P ", file.DestinationPathPrefix)
 		} else {
 			command.Flag("-P ''")
 		}
 		if file.DestinationPath != "" {
 			command.FlagWithArg("-e ", file.DestinationPath)
 		}
 		command.FlagWithInput("-f ", file.SourceFilePath)
 	}

 	builder.Build("create-"+fuzzZip.String(),
 		"Package "+module.Name()+" for "+archString+"-"+hostOrTargetString)

 	if config := fuzzModule.FuzzProperties.Fuzz_config; config != nil {
 		if strings.Contains(hostOrTargetString, "host") && !BoolDefault(config.Fuzz_on_haiku_host, true) {
 			return archDirs[archOs], false
 		} else if !strings.Contains(hostOrTargetString, "host") && !BoolDefault(config.Fuzz_on_haiku_device, true) {
 			return archDirs[archOs], false
 		}
 	}

 	s.FuzzTargets[module.Name()] = true
 	archDirs[archOs] = append(archDirs[archOs], FileToZip{SourceFilePath: fuzzZip})

 	return archDirs[archOs], true
 }

 func (f *FuzzConfig) String() string {
 	b, err := json.Marshal(f)
 	if err != nil {
 		panic(err)
 	}

 	return string(b)
 }

 func (s *FuzzPackager) CreateFuzzPackage(ctx android.SingletonContext, archDirs map[ArchOs][]FileToZip, fuzzType Lang, pctx android.PackageContext) {
 	var archOsList []ArchOs
 	for archOs := range archDirs {
 		archOsList = append(archOsList, archOs)
 	}
 	sort.Slice(archOsList, func(i, j int) bool { return archOsList[i].Dir < archOsList[j].Dir })

 	for _, archOs := range archOsList {
 		filesToZip := archDirs[archOs]
 		arch := archOs.Arch
 		hostOrTarget := archOs.HostOrTarget
 		builder := android.NewRuleBuilder(pctx, ctx)
 		zipFileName := "fuzz-" + hostOrTarget + "-" + arch + ".zip"
 		if fuzzType == Rust {
 			zipFileName = "fuzz-rust-" + hostOrTarget + "-" + arch + ".zip"
 		}
 		if fuzzType == Java {
 			zipFileName = "fuzz-java-" + hostOrTarget + "-" + arch + ".zip"
 		}

 		outputFile := android.PathForOutput(ctx, zipFileName)

 		s.Packages = append(s.Packages, outputFile)

 		command := builder.Command().BuiltTool("soong_zip").
 			Flag("-j").
 			FlagWithOutput("-o ", outputFile).
 			Flag("-L 0") // No need to try and re-compress the zipfiles.

 		for _, fileToZip := range filesToZip {
 			if fileToZip.DestinationPathPrefix != "" {
 				command.FlagWithArg("-P ", fileToZip.DestinationPathPrefix)
 			} else {
 				command.Flag("-P ''")
 			}
 			command.FlagWithInput("-f ", fileToZip.SourceFilePath)

 		}
 		builder.Build("create-fuzz-package-"+arch+"-"+hostOrTarget,
 			"Create fuzz target packages for "+arch+"-"+hostOrTarget)
 	}
 }

 func (s *FuzzPackager) PreallocateSlice(ctx android.MakeVarsContext, targets string) {
 	fuzzTargets := make([]string, 0, len(s.FuzzTargets))
 	for target, _ := range s.FuzzTargets {
 		fuzzTargets = append(fuzzTargets, target)
 	}

 	sort.Strings(fuzzTargets)
 	ctx.Strict(targets, strings.Join(fuzzTargets, " "))
 }
	// Copyright 2021 Google Inc. All rights reserved.
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.

	package fuzz

	// This file contains the common code for compiling C/C++ and Rust fuzzers for Android.

	import (
	"encoding/json"
	"fmt"
	"sort"
	"strings"

	"github.com/google/blueprint/proptools"

	"android/soong/android"
	)

	type Lang string

	const (
	Cc Lang = "cc"
	Rust Lang = "rust"
	Java Lang = "java"
	)

	type Framework string

	const (
	AFL Framework = "afl"
	LibFuzzer Framework = "libfuzzer"
	Jazzer Framework = "jazzer"
	UnknownFramework Framework = "unknownframework"
	)

	var BoolDefault = proptools.BoolDefault

	type FuzzModule struct {
	android.ModuleBase
	android.DefaultableModuleBase
	android.ApexModuleBase
	}

	type FuzzPackager struct {
	Packages android.Paths
	FuzzTargets map[string]bool
	SharedLibInstallStrings []string
	}

	type FileToZip struct {
	SourceFilePath android.Path
	DestinationPathPrefix string
	DestinationPath string
	}

	type ArchOs struct {
	HostOrTarget string
	Arch string
	Dir string
	}

	type Vector string

	const (
	unknown_access_vector Vector = "unknown_access_vector"
	// The code being fuzzed is reachable from a remote source, or using data
	// provided by a remote source. For example: media codecs process media files
	// from the internet, SMS processing handles remote message data.
	// See
	// https://source.android.com/docs/security/overview/updates-resources#local-vs-remote
	// for an explanation of what's considered "remote."
	remote = "remote"
	// The code being fuzzed can only be reached locally, such as from an
	// installed app. As an example, if it's fuzzing a Binder interface, it's
	// assumed that you'd need a local app to make arbitrary Binder calls.
	// And the app that's calling the fuzzed code does not require any privileges;
	// any 3rd party app could make these calls.
	local_no_privileges_required = "local_no_privileges_required"
	// The code being fuzzed can only be called locally, and the calling process
	// requires additional permissions that prevent arbitrary 3rd party apps from
	// calling the code. For instance: this requires a privileged or signature
	// permission to reach, or SELinux restrictions prevent the untrusted_app
	// domain from calling it.
	local_privileges_required = "local_privileges_required"
	// The code is only callable on a PC host, not on a production Android device.
	// For instance, this is fuzzing code used during the build process, or
	// tooling that does not exist on a user's actual Android device.
	host_access = "host_access"
	// The code being fuzzed is only reachable if the user has enabled Developer
	// Options, or has enabled a persistent Developer Options setting.
	local_with_developer_options = "local_with_developer_options"
	)

	func (vector Vector) isValidVector() bool {
	switch vector {
	case "",
	unknown_access_vector,
	remote,
	local_no_privileges_required,
	local_privileges_required,
	host_access,
	local_with_developer_options:
	return true
	}
	return false
	}

	type ServicePrivilege string

	const (
	unknown_service_privilege ServicePrivilege = "unknown_service_privilege"
	// The code being fuzzed runs on a Secure Element. This has access to some
	// of the most privileged data on the device, such as authentication keys.
	// Not all devices have a Secure Element.
	secure_element = "secure_element"
	// The code being fuzzed runs in the TEE. The TEE is designed to be resistant
	// to a compromised kernel, and stores sensitive data.
	trusted_execution = "trusted_execution"
	// The code being fuzzed has privileges beyond what arbitrary 3rd party apps
	// have. For instance, it's running as the System UID, or it's in an SELinux
	// domain that's able to perform calls that can't be made by 3rd party apps.
	privileged = "privileged"
	// The code being fuzzed is equivalent to a 3rd party app. It runs in the
	// untrusted_app SELinux domain, or it only has privileges that are equivalent
	// to what a 3rd party app could have.
	unprivileged = "unprivileged"
	// The code being fuzzed is significantly constrained, and even if it's
	// compromised, it has significant restrictions that prevent it from
	// performing most actions. This is significantly more restricted than
	// UNPRIVILEGED. An example is the isolatedProcess=true setting in a 3rd
	// party app. Or a process that's very restricted by SELinux, such as
	// anything in the mediacodec SELinux domain.
	constrained = "constrained"
	// The code being fuzzed always has Negligible Security Impact. Even
	// arbitrary out of bounds writes and full code execution would not be
	// considered a security vulnerability. This typically only makes sense if
	// FuzzedCodeUsage is set to FUTURE_VERSION or EXPERIMENTAL, and if
	// AutomaticallyRouteTo is set to ALWAYS_NSI.
	nsi = "nsi"
	// The code being fuzzed only runs on a PC host, not on a production Android
	// device. For instance, the fuzzer is fuzzing code used during the build
	// process, or tooling that does not exist on a user's actual Android device.
	host_only = "host_only"
	)

	func (service_privilege ServicePrivilege) isValidServicePrivilege() bool {
	switch service_privilege {
	case "",
	unknown_service_privilege,
	secure_element,
	trusted_execution,
	privileged,
	unprivileged,
	constrained,
	nsi,
	host_only:
	return true
	}
	return false
	}

	type UsePlatformLibs string

	const (
	unknown_use_platform_libs UsePlatformLibs = "unknown_use_platform_libs"
	// Use the native libraries on the device, typically in /system directory
	use_platform_libs = "use_platform_libs"
	// Do not use any native libraries (ART will not be initialized)
	use_none = "use_none"
	)

	func (use_platform_libs UsePlatformLibs) isValidUsePlatformLibs() bool {
	switch use_platform_libs {
	case "",
	unknown_use_platform_libs,
	use_platform_libs,
	use_none:
	return true
	}
	return false
	}

	type UserData string

	const (
	unknown_user_data UserData = "unknown_user_data"
	// The process being fuzzed only handles data from a single user, or from a
	// single process or app. It's possible the process shuts down before
	// handling data from another user/process/app, or it's possible the process
	// only ever handles one user's/process's/app's data. As an example, some
	// print spooler processes are started for a single document and terminate
	// when done, so each instance only handles data from a single user/app.
	single_user = "single_user"
	// The process handles data from multiple users, or from multiple other apps
	// or processes. Media processes, for instance, can handle media requests
	// from multiple different apps without restarting. Wi-Fi and network
	// processes handle data from multiple users, and processes, and apps.
	multi_user = "multi_user"
	)

	func (user_data UserData) isValidUserData() bool {
	switch user_data {
	case "",
	unknown_user_data,
	single_user,
	multi_user:
	return true
	}
	return false
	}

	type FuzzedCodeUsage string

	const (
	undefined FuzzedCodeUsage = "undefined"
	unknown = "unknown"
	// The code being fuzzed exists in a shipped version of Android and runs on
	// devices in production.
	shipped = "shipped"
	// The code being fuzzed is not yet in a shipping version of Android, but it
	// will be at some point in the future.
	future_version = "future_version"
	// The code being fuzzed is not in a shipping version of Android, and there
	// are no plans to ship it in the future.
	experimental = "experimental"
	)

	func (fuzzed_code_usage FuzzedCodeUsage) isValidFuzzedCodeUsage() bool {
	switch fuzzed_code_usage {
	case "",
	undefined,
	unknown,
	shipped,
	future_version,
	experimental:
	return true
	}
	return false
	}

	type AutomaticallyRouteTo string

	const (
	undefined_routing AutomaticallyRouteTo = "undefined_routing"
	// Automatically route this to the Android Automotive security team for
	// assessment.
	android_automotive = "android_automotive"
	// This should not be used in fuzzer configurations. It is used internally
	// by Severity Assigner to flag memory leak reports.
	memory_leak = "memory_leak"
	// Route this vulnerability to our Ittiam vendor team for assessment.
	ittiam = "ittiam"
	// Reports from this fuzzer are always NSI (see the NSI ServicePrivilegeEnum
	// value for additional context). It is not possible for this code to ever
	// have a security vulnerability.
	always_nsi = "always_nsi"
	// Route this vulnerability to AIDL team for assessment.
	aidl = "aidl"
	)

	func (automatically_route_to AutomaticallyRouteTo) isValidAutomaticallyRouteTo() bool {
	switch automatically_route_to {
	case "",
	undefined_routing,
	android_automotive,
	memory_leak,
	ittiam,
	always_nsi,
	aidl:
	return true
	}
	return false
	}

	func IsValidConfig(fuzzModule FuzzPackagedModule, moduleName string) bool {
	var config = fuzzModule.FuzzProperties.Fuzz_config
	if config != nil {
	if !config.Vector.isValidVector() {
	panic(fmt.Errorf("Invalid vector in fuzz config in %s", moduleName))
	}

	if !config.Service_privilege.isValidServicePrivilege() {
	panic(fmt.Errorf("Invalid service_privilege in fuzz config in %s", moduleName))
	}

	if !config.Users.isValidUserData() {
	panic(fmt.Errorf("Invalid users (user_data) in fuzz config in %s", moduleName))
	}

	if !config.Fuzzed_code_usage.isValidFuzzedCodeUsage() {
	panic(fmt.Errorf("Invalid fuzzed_code_usage in fuzz config in %s", moduleName))
	}

	if !config.Automatically_route_to.isValidAutomaticallyRouteTo() {
	panic(fmt.Errorf("Invalid automatically_route_to in fuzz config in %s", moduleName))
	}

	if !config.Use_platform_libs.isValidUsePlatformLibs() {
	panic(fmt.Errorf("Invalid use_platform_libs in fuzz config in %s", moduleName))
	}
	}
	return true
	}

	type FuzzConfig struct {
	// Email address of people to CC on bugs or contact about this fuzz target.
	Cc []string `json:"cc,omitempty"`
	// A brief description of what the fuzzed code does.
	Description string `json:"description,omitempty"`
	// Whether the code being fuzzed is remotely accessible or requires privileges
	// to access locally.
	Vector Vector `json:"vector,omitempty"`
	// How privileged the service being fuzzed is.
	Service_privilege ServicePrivilege `json:"service_privilege,omitempty"`
	// Whether the service being fuzzed handles data from multiple users or only
	// a single one.
	Users UserData `json:"users,omitempty"`
	// Specifies the use state of the code being fuzzed. This state factors into
	// how an issue is handled.
	Fuzzed_code_usage FuzzedCodeUsage `json:"fuzzed_code_usage,omitempty"`
	// Comment describing how we came to these settings for this fuzzer.
	Config_comment string
	// Which team to route this to, if it should be routed automatically.
	Automatically_route_to AutomaticallyRouteTo `json:"automatically_route_to,omitempty"`
	// Can third party/untrusted apps supply data to fuzzed code.
	Untrusted_data *bool `json:"untrusted_data,omitempty"`
	// When code was released or will be released.
	Production_date string `json:"production_date,omitempty"`
	// Prevents critical service functionality like phone calls, bluetooth, etc.
	Critical *bool `json:"critical,omitempty"`
	// Specify whether to enable continuous fuzzing on devices. Defaults to true.
	Fuzz_on_haiku_device *bool `json:"fuzz_on_haiku_device,omitempty"`
	// Specify whether to enable continuous fuzzing on host. Defaults to true.
	Fuzz_on_haiku_host *bool `json:"fuzz_on_haiku_host,omitempty"`
	// Component in Google's bug tracking system that bugs should be filed to.
	Componentid *int64 `json:"componentid,omitempty"`
	// Hotlist(s) in Google's bug tracking system that bugs should be marked with.
	Hotlists []string `json:"hotlists,omitempty"`
	// Specify whether this fuzz target was submitted by a researcher. Defaults
	// to false.
	Researcher_submitted *bool `json:"researcher_submitted,omitempty"`
	// Specify who should be acknowledged for CVEs in the Android Security
	// Bulletin.
	Acknowledgement []string `json:"acknowledgement,omitempty"`
	// Additional options to be passed to libfuzzer when run in Haiku.
	Libfuzzer_options []string `json:"libfuzzer_options,omitempty"`
	// Additional options to be passed to HWASAN when running on-device in Haiku.
	Hwasan_options []string `json:"hwasan_options,omitempty"`
	// Additional options to be passed to HWASAN when running on host in Haiku.
	Asan_options []string `json:"asan_options,omitempty"`
	// If there's a Java fuzzer with JNI, a different version of Jazzer would
	// need to be added to the fuzzer package than one without JNI
	IsJni *bool `json:"is_jni,omitempty"`
	// List of modules for monitoring coverage drops in directories (e.g. "libicu")
	Target_modules []string `json:"target_modules,omitempty"`
	// Specifies a bug assignee to replace default ISE assignment
	Triage_assignee string `json:"triage_assignee,omitempty"`
	// Specifies libs used to initialize ART (java only, 'use_none' for no initialization)
	Use_platform_libs UsePlatformLibs `json:"use_platform_libs,omitempty"`
	// Specifies whether fuzz target should check presubmitted code changes for crashes.
	// Defaults to false.
	Use_for_presubmit *bool `json:"use_for_presubmit,omitempty"`
	// Specify which paths to exclude from fuzzing coverage reports
	Exclude_paths_from_reports []string `json:"exclude_paths_from_reports,omitempty"`
	}

	type FuzzFrameworks struct {
	Afl *bool
	Libfuzzer *bool
	Jazzer *bool
	}

	type FuzzProperties struct {
	// Optional list of seed files to be installed to the fuzz target's output
	// directory.
	Corpus []string `android:"path"`
	// Optional list of data files to be installed to the fuzz target's output
	// directory. Directory structure relative to the module is preserved.
	Data []string `android:"path"`
	// Optional dictionary to be installed to the fuzz target's output directory.
	Dictionary *string `android:"path"`
	// Define the fuzzing frameworks this fuzz target can be built for. If
	// empty then the fuzz target will be available to be built for all fuzz
	// frameworks available
	Fuzzing_frameworks *FuzzFrameworks
	// Config for running the target on fuzzing infrastructure.
	Fuzz_config *FuzzConfig
	}

	type FuzzPackagedModule struct {
	FuzzProperties FuzzProperties
	Dictionary android.Path
	Corpus android.Paths
	Config android.Path
	Data android.Paths
	}

	func GetFramework(ctx android.LoadHookContext, lang Lang) Framework {
	framework := ctx.Config().Getenv("FUZZ_FRAMEWORK")

	if lang == Cc {
	switch strings.ToLower(framework) {
	case "":
	return LibFuzzer
	case "libfuzzer":
	return LibFuzzer
	case "afl":
	return AFL
	}
	} else if lang == Rust {
	return LibFuzzer
	} else if lang == Java {
	return Jazzer
	}

	ctx.ModuleErrorf(fmt.Sprintf("%s is not a valid fuzzing framework for %s", framework, lang))
	return UnknownFramework
	}

	func IsValidFrameworkForModule(targetFramework Framework, lang Lang, moduleFrameworks *FuzzFrameworks) bool {
	if targetFramework == UnknownFramework {
	return false
	}

	if moduleFrameworks == nil {
	return true
	}

	switch targetFramework {
	case LibFuzzer:
	return proptools.BoolDefault(moduleFrameworks.Libfuzzer, true)
	case AFL:
	return proptools.BoolDefault(moduleFrameworks.Afl, true)
	case Jazzer:
	return proptools.BoolDefault(moduleFrameworks.Jazzer, true)
	default:
	panic("%s is not supported as a fuzz framework")
	}
	}

	func IsValid(fuzzModule FuzzModule) bool {
	// Discard ramdisk + vendor_ramdisk + recovery modules, they're duplicates of
	// fuzz targets we're going to package anyway.
	if !fuzzModule.Enabled() \|\| fuzzModule.InRamdisk() \|\| fuzzModule.InVendorRamdisk() \|\| fuzzModule.InRecovery() {
	return false
	}

	// Discard modules that are in an unavailable namespace.
	if !fuzzModule.ExportedToMake() {
	return false
	}

	return true
	}

	func (s FuzzPackager) PackageArtifacts(ctx android.SingletonContext, module android.Module, fuzzModule FuzzPackagedModule, archDir android.OutputPath, builder android.RuleBuilder) []FileToZip {
	// Package the corpora into a zipfile.
	var files []FileToZip
	if fuzzModule.Corpus != nil {
	corpusZip := archDir.Join(ctx, module.Name()+"_seed_corpus.zip")
	command := builder.Command().BuiltTool("soong_zip").
	Flag("-j").
	FlagWithOutput("-o ", corpusZip)
	rspFile := corpusZip.ReplaceExtension(ctx, "rsp")
	command.FlagWithRspFileInputList("-r ", rspFile, fuzzModule.Corpus)
	files = append(files, FileToZip{SourceFilePath: corpusZip})
	}

	// Package the data into a zipfile.
	if fuzzModule.Data != nil {
	dataZip := archDir.Join(ctx, module.Name()+"_data.zip")
	command := builder.Command().BuiltTool("soong_zip").
	FlagWithOutput("-o ", dataZip)
	for _, f := range fuzzModule.Data {
	intermediateDir := strings.TrimSuffix(f.String(), f.Rel())
	command.FlagWithArg("-C ", intermediateDir)
	command.FlagWithInput("-f ", f)
	}
	files = append(files, FileToZip{SourceFilePath: dataZip})
	}

	// The dictionary.
	if fuzzModule.Dictionary != nil {
	files = append(files, FileToZip{SourceFilePath: fuzzModule.Dictionary})
	}

	// Additional fuzz config.
	if fuzzModule.Config != nil && IsValidConfig(fuzzModule, module.Name()) {
	files = append(files, FileToZip{SourceFilePath: fuzzModule.Config})
	}

	return files
	}

	func (s FuzzPackager) BuildZipFile(ctx android.SingletonContext, module android.Module, fuzzModule FuzzPackagedModule, files []FileToZip, builder android.RuleBuilder, archDir android.OutputPath, archString string, hostOrTargetString string, archOs ArchOs, archDirs map[ArchOs][]FileToZip) ([]FileToZip, bool) {
	fuzzZip := archDir.Join(ctx, module.Name()+".zip")

	command := builder.Command().BuiltTool("soong_zip").
	Flag("-j").
	FlagWithOutput("-o ", fuzzZip)

	for _, file := range files {
	if file.DestinationPathPrefix != "" {
	command.FlagWithArg("-P ", file.DestinationPathPrefix)
	} else {
	command.Flag("-P ''")
	}
	if file.DestinationPath != "" {
	command.FlagWithArg("-e ", file.DestinationPath)
	}
	command.FlagWithInput("-f ", file.SourceFilePath)
	}

	builder.Build("create-"+fuzzZip.String(),
	"Package "+module.Name()+" for "+archString+"-"+hostOrTargetString)

	if config := fuzzModule.FuzzProperties.Fuzz_config; config != nil {
	if strings.Contains(hostOrTargetString, "host") && !BoolDefault(config.Fuzz_on_haiku_host, true) {
	return archDirs[archOs], false
	} else if !strings.Contains(hostOrTargetString, "host") && !BoolDefault(config.Fuzz_on_haiku_device, true) {
	return archDirs[archOs], false
	}
	}

	s.FuzzTargets[module.Name()] = true
	archDirs[archOs] = append(archDirs[archOs], FileToZip{SourceFilePath: fuzzZip})

	return archDirs[archOs], true
	}

	func (f *FuzzConfig) String() string {
	b, err := json.Marshal(f)
	if err != nil {
	panic(err)
	}

	return string(b)
	}

	func (s *FuzzPackager) CreateFuzzPackage(ctx android.SingletonContext, archDirs map[ArchOs][]FileToZip, fuzzType Lang, pctx android.PackageContext) {
	var archOsList []ArchOs
	for archOs := range archDirs {
	archOsList = append(archOsList, archOs)
	}
	sort.Slice(archOsList, func(i, j int) bool { return archOsList[i].Dir < archOsList[j].Dir })

	for _, archOs := range archOsList {
	filesToZip := archDirs[archOs]
	arch := archOs.Arch
	hostOrTarget := archOs.HostOrTarget
	builder := android.NewRuleBuilder(pctx, ctx)
	zipFileName := "fuzz-" + hostOrTarget + "-" + arch + ".zip"
	if fuzzType == Rust {
	zipFileName = "fuzz-rust-" + hostOrTarget + "-" + arch + ".zip"
	}
	if fuzzType == Java {
	zipFileName = "fuzz-java-" + hostOrTarget + "-" + arch + ".zip"
	}

	outputFile := android.PathForOutput(ctx, zipFileName)

	s.Packages = append(s.Packages, outputFile)

	command := builder.Command().BuiltTool("soong_zip").
	Flag("-j").
	FlagWithOutput("-o ", outputFile).
	Flag("-L 0") // No need to try and re-compress the zipfiles.

	for _, fileToZip := range filesToZip {
	if fileToZip.DestinationPathPrefix != "" {
	command.FlagWithArg("-P ", fileToZip.DestinationPathPrefix)
	} else {
	command.Flag("-P ''")
	}
	command.FlagWithInput("-f ", fileToZip.SourceFilePath)

	}
	builder.Build("create-fuzz-package-"+arch+"-"+hostOrTarget,
	"Create fuzz target packages for "+arch+"-"+hostOrTarget)
	}
	}

	func (s *FuzzPackager) PreallocateSlice(ctx android.MakeVarsContext, targets string) {
	fuzzTargets := make([]string, 0, len(s.FuzzTargets))
	for target, _ := range s.FuzzTargets {
	fuzzTargets = append(fuzzTargets, target)
	}

	sort.Strings(fuzzTargets)
	ctx.Strict(targets, strings.Join(fuzzTargets, " "))
	}