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 FuzzType string

 const (
 	Cc   FuzzType = ""
 	Rust FuzzType = "rust"
 	Java FuzzType = "java"
 	AFL  FuzzType = "AFL"
 )

 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
 	FuzzType                FuzzType
 }

 type FileToZip struct {
 	SourceFilePath        android.Path
 	DestinationPathPrefix string
 }

 type ArchOs struct {
 	HostOrTarget string
 	Arch         string
 	Dir          string
 }

 type PrivilegedLevel string

 const (
 	// Environment with the most minimal permissions.
 	Constrained PrivilegedLevel = "Constrained"
 	// Typical execution environment running unprivileged code.
 	Unprivileged = "Unprivileged"
 	// May have access to elevated permissions.
 	Privileged = "Privileged"
 	// Trusted computing base.
 	Tcb = "TCB"
 	// Bootloader chain.
 	Bootloader = "Bootloader"
 	// Tusted execution environment.
 	Tee = "Tee"
 	// Secure enclave.
 	Se = "Se"
 	// Other.
 	Other = "Other"
 )

 func IsValidConfig(fuzzModule FuzzPackagedModule, moduleName string) bool {
 	var config = fuzzModule.FuzzProperties.Fuzz_config
 	if config != nil {
 		var level = PrivilegedLevel(config.Privilege_level)
 		if level != "" {
 			switch level {
 			case Constrained, Unprivileged, Privileged, Tcb, Bootloader, Tee, Se, Other:
 				return true
 			}
 			panic(fmt.Errorf("Invalid privileged level in fuzz config in %s", moduleName))
 		}
 		return true
 	} else {
 		return false
 	}
 }

 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"`
 	// Can this code be triggered remotely or only locally.
 	Remotely_accessible *bool `json:"remotely_accessible,omitempty"`
 	// Is the fuzzed code host only, i.e. test frameworks or support utilities.
 	Host_only *bool `json:"host_only,omitempty"`
 	// Can third party/untrusted apps supply data to fuzzed code.
 	Untrusted_data *bool `json:"untrusted_data,omitempty"`
 	// Is the code being fuzzed in a privileged, constrained or any other
 	// context from:
 	// https://source.android.com/security/overview/updates-resources#context_types.
 	Privilege_level PrivilegedLevel `json:"privilege_level,omitempty"`
 	// Can the fuzzed code isolated or can be called by multiple users/processes.
 	Isolated *bool `json:"users_isolation,omitempty"`
 	// When code was relaeased 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"`
 	// Hotlists 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"`
 }

 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"`
 	// Config for running the target on fuzzing infrastructure.
 	Fuzz_config *FuzzConfig
 }

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

 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{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{dataZip, ""})
 	}

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

 	// Additional fuzz config.
 	if fuzzModule.Config != nil && IsValidConfig(fuzzModule, module.Name()) {
 		files = append(files, FileToZip{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 ''")
 		}
 		command.FlagWithInput("-f ", file.SourceFilePath)
 	}

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

 	// Don't add modules to 'make haiku-rust' that are set to not be
 	// exported to the fuzzing infrastructure.
 	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 !BoolDefault(config.Fuzz_on_haiku_device, true) {
 			return archDirs[archOs], false
 		}
 	}

 	s.FuzzTargets[module.Name()] = true
 	archDirs[archOs] = append(archDirs[archOs], FileToZip{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 FuzzType, 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"
 		}
 		if fuzzType == AFL {
 			zipFileName = "fuzz-afl-" + 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, " "))
 }

 // CollectAllSharedDependencies performs a breadth-first search over the provided module's
 // dependencies using `visitDirectDeps` to enumerate all shared library
 // dependencies. We require breadth-first expansion, as otherwise we may
 // incorrectly use the core libraries (sanitizer runtimes, libc, libdl, etc.)
 // from a dependency. This may cause issues when dependencies have explicit
 // sanitizer tags, as we may get a dependency on an unsanitized libc, etc.
 func CollectAllSharedDependencies(ctx android.SingletonContext, module android.Module, unstrippedOutputFile func(module android.Module) android.Path, isValidSharedDependency func(dependency android.Module) bool) android.Paths {
 	var fringe []android.Module

 	seen := make(map[string]bool)

 	// Enumerate the first level of dependencies, as we discard all non-library
 	// modules in the BFS loop below.
 	ctx.VisitDirectDeps(module, func(dep android.Module) {
 		if isValidSharedDependency(dep) {
 			fringe = append(fringe, dep)
 		}
 	})

 	var sharedLibraries android.Paths

 	for i := 0; i < len(fringe); i++ {
 		module := fringe[i]
 		if seen[module.Name()] {
 			continue
 		}
 		seen[module.Name()] = true

 		sharedLibraries = append(sharedLibraries, unstrippedOutputFile(module))
 		ctx.VisitDirectDeps(module, func(dep android.Module) {
 			if isValidSharedDependency(dep) && !seen[dep.Name()] {
 				fringe = append(fringe, dep)
 			}
 		})
 	}

 	return sharedLibraries
 }
	// 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 FuzzType string

	const (
	Cc FuzzType = ""
	Rust FuzzType = "rust"
	Java FuzzType = "java"
	AFL FuzzType = "AFL"
	)

	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
	FuzzType FuzzType
	}

	type FileToZip struct {
	SourceFilePath android.Path
	DestinationPathPrefix string
	}

	type ArchOs struct {
	HostOrTarget string
	Arch string
	Dir string
	}

	type PrivilegedLevel string

	const (
	// Environment with the most minimal permissions.
	Constrained PrivilegedLevel = "Constrained"
	// Typical execution environment running unprivileged code.
	Unprivileged = "Unprivileged"
	// May have access to elevated permissions.
	Privileged = "Privileged"
	// Trusted computing base.
	Tcb = "TCB"
	// Bootloader chain.
	Bootloader = "Bootloader"
	// Tusted execution environment.
	Tee = "Tee"
	// Secure enclave.
	Se = "Se"
	// Other.
	Other = "Other"
	)

	func IsValidConfig(fuzzModule FuzzPackagedModule, moduleName string) bool {
	var config = fuzzModule.FuzzProperties.Fuzz_config
	if config != nil {
	var level = PrivilegedLevel(config.Privilege_level)
	if level != "" {
	switch level {
	case Constrained, Unprivileged, Privileged, Tcb, Bootloader, Tee, Se, Other:
	return true
	}
	panic(fmt.Errorf("Invalid privileged level in fuzz config in %s", moduleName))
	}
	return true
	} else {
	return false
	}
	}

	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"`
	// Can this code be triggered remotely or only locally.
	Remotely_accessible *bool `json:"remotely_accessible,omitempty"`
	// Is the fuzzed code host only, i.e. test frameworks or support utilities.
	Host_only *bool `json:"host_only,omitempty"`
	// Can third party/untrusted apps supply data to fuzzed code.
	Untrusted_data *bool `json:"untrusted_data,omitempty"`
	// Is the code being fuzzed in a privileged, constrained or any other
	// context from:
	// https://source.android.com/security/overview/updates-resources#context_types.
	Privilege_level PrivilegedLevel `json:"privilege_level,omitempty"`
	// Can the fuzzed code isolated or can be called by multiple users/processes.
	Isolated *bool `json:"users_isolation,omitempty"`
	// When code was relaeased 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"`
	// Hotlists 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"`
	}

	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"`
	// Config for running the target on fuzzing infrastructure.
	Fuzz_config *FuzzConfig
	}

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

	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{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{dataZip, ""})
	}

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

	// Additional fuzz config.
	if fuzzModule.Config != nil && IsValidConfig(fuzzModule, module.Name()) {
	files = append(files, FileToZip{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 ''")
	}
	command.FlagWithInput("-f ", file.SourceFilePath)
	}

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

	// Don't add modules to 'make haiku-rust' that are set to not be
	// exported to the fuzzing infrastructure.
	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 !BoolDefault(config.Fuzz_on_haiku_device, true) {
	return archDirs[archOs], false
	}
	}

	s.FuzzTargets[module.Name()] = true
	archDirs[archOs] = append(archDirs[archOs], FileToZip{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 FuzzType, 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"
	}
	if fuzzType == AFL {
	zipFileName = "fuzz-afl-" + 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, " "))
	}

	// CollectAllSharedDependencies performs a breadth-first search over the provided module's
	// dependencies using `visitDirectDeps` to enumerate all shared library
	// dependencies. We require breadth-first expansion, as otherwise we may
	// incorrectly use the core libraries (sanitizer runtimes, libc, libdl, etc.)
	// from a dependency. This may cause issues when dependencies have explicit
	// sanitizer tags, as we may get a dependency on an unsanitized libc, etc.
	func CollectAllSharedDependencies(ctx android.SingletonContext, module android.Module, unstrippedOutputFile func(module android.Module) android.Path, isValidSharedDependency func(dependency android.Module) bool) android.Paths {
	var fringe []android.Module

	seen := make(map[string]bool)

	// Enumerate the first level of dependencies, as we discard all non-library
	// modules in the BFS loop below.
	ctx.VisitDirectDeps(module, func(dep android.Module) {
	if isValidSharedDependency(dep) {
	fringe = append(fringe, dep)
	}
	})

	var sharedLibraries android.Paths

	for i := 0; i < len(fringe); i++ {
	module := fringe[i]
	if seen[module.Name()] {
	continue
	}
	seen[module.Name()] = true

	sharedLibraries = append(sharedLibraries, unstrippedOutputFile(module))
	ctx.VisitDirectDeps(module, func(dep android.Module) {
	if isValidSharedDependency(dep) && !seen[dep.Name()] {
	fringe = append(fringe, dep)
	}
	})
	}

	return sharedLibraries
	}