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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
#include <climits>
#include <cmath>
#include "FuzzingTraits.h"
#include "jsapi.h"
#include "jsfriendapi.h"
#include "js/CharacterEncoding.h"
#include "js/Exception.h"
#include "js/PropertyAndElement.h" // JS_Enumerate, JS_GetProperty, JS_GetPropertyById, JS_SetProperty, JS_SetPropertyById
#include "prenv.h"
#include "MessageManagerFuzzer.h"
#include "mozilla/ErrorResult.h"
#include "nsComponentManagerUtils.h"
#include "nsDebug.h"
#include "nsError.h"
#include "nsFrameMessageManager.h"
#include "nsJSUtils.h"
#include "nsXULAppAPI.h"
#include "nsNetCID.h"
#include "nsString.h"
#include "nsUnicharUtils.h"
#include "nsIFile.h"
#include "nsIFileStreams.h"
#include "nsILineInputStream.h"
#include "nsLocalFile.h"
#include "nsTArray.h"
#ifdef IsLoggingEnabled
// This is defined in the Windows SDK urlmon.h
# undef IsLoggingEnabled
#endif
#define MESSAGEMANAGER_FUZZER_DEFAULT_MUTATION_PROBABILITY 2
#define MSGMGR_FUZZER_LOG(fmt, args...) \
if (MessageManagerFuzzer::IsLoggingEnabled()) { \
printf_stderr("[MessageManagerFuzzer] " fmt "\n", ##args); \
}
namespace mozilla {
namespace dom {
using namespace fuzzing;
using namespace ipc;
/* static */
void MessageManagerFuzzer::ReadFile(const char* path,
nsTArray<nsCString>& aArray) {
nsCOMPtr<nsIFile> file;
nsresult rv =
NS_NewLocalFile(NS_ConvertUTF8toUTF16(path), getter_AddRefs(file));
NS_ENSURE_SUCCESS_VOID(rv);
bool exists = false;
rv = file->Exists(&exists);
if (NS_FAILED(rv) || !exists) {
return;
}
nsCOMPtr<nsIFileInputStream> fileStream(
do_CreateInstance(NS_LOCALFILEINPUTSTREAM_CONTRACTID, &rv));
NS_ENSURE_SUCCESS_VOID(rv);
rv = fileStream->Init(file, -1, -1, false);
NS_ENSURE_SUCCESS_VOID(rv);
nsCOMPtr<nsILineInputStream> lineStream(do_QueryInterface(fileStream, &rv));
NS_ENSURE_SUCCESS_VOID(rv);
nsAutoCString line;
bool more = true;
do {
rv = lineStream->ReadLine(line, &more);
NS_ENSURE_SUCCESS_VOID(rv);
aArray.AppendElement(line);
} while (more);
}
/* static */
bool MessageManagerFuzzer::IsMessageNameBlacklisted(
const nsAString& aMessageName) {
static bool sFileLoaded = false;
static nsTArray<nsCString> valuesInFile;
if (!sFileLoaded) {
ReadFile(PR_GetEnv("MESSAGEMANAGER_FUZZER_BLACKLIST"), valuesInFile);
sFileLoaded = true;
}
if (valuesInFile.Length() == 0) {
return false;
}
return valuesInFile.Contains(NS_ConvertUTF16toUTF8(aMessageName).get());
}
/* static */
nsCString MessageManagerFuzzer::GetFuzzValueFromFile() {
static bool sFileLoaded = false;
static nsTArray<nsCString> valuesInFile;
if (!sFileLoaded) {
ReadFile(PR_GetEnv("MESSAGEMANAGER_FUZZER_STRINGSFILE"), valuesInFile);
sFileLoaded = true;
}
// If something goes wrong with importing the file we return an empty string.
if (valuesInFile.Length() == 0) {
return nsCString();
}
unsigned randIdx = RandomIntegerRange<unsigned>(0, valuesInFile.Length());
return valuesInFile.ElementAt(randIdx);
}
/* static */
void MessageManagerFuzzer::MutateObject(JSContext* aCx,
JS::Handle<JS::Value> aValue,
unsigned short int aRecursionCounter) {
JS::Rooted<JSObject*> object(aCx, &aValue.toObject());
JS::Rooted<JS::IdVector> ids(aCx, JS::IdVector(aCx));
if (!JS_Enumerate(aCx, object, &ids)) {
return;
}
for (size_t i = 0, n = ids.length(); i < n; i++) {
// Retrieve Property name.
nsAutoJSString propName;
if (!propName.init(aCx, ids[i])) {
continue;
}
MSGMGR_FUZZER_LOG("%*s- Property: %s", aRecursionCounter * 4, "",
NS_ConvertUTF16toUTF8(propName).get());
// The likelihood when a value gets fuzzed of this object.
if (!FuzzingTraits::Sometimes(DefaultMutationProbability())) {
continue;
}
// Retrieve Property value.
JS::Rooted<JS::Value> propertyValue(aCx);
JS_GetPropertyById(aCx, object, ids[i], &propertyValue);
JS::Rooted<JS::Value> newPropValue(aCx);
MutateValue(aCx, propertyValue, &newPropValue, aRecursionCounter);
JS_SetPropertyById(aCx, object, ids[i], newPropValue);
}
}
/* static */
bool MessageManagerFuzzer::MutateValue(
JSContext* aCx, JS::Handle<JS::Value> aValue,
JS::MutableHandle<JS::Value> aOutMutationValue,
unsigned short int aRecursionCounter) {
if (aValue.isInt32()) {
if (FuzzingTraits::Sometimes(DefaultMutationProbability() * 2)) {
aOutMutationValue.set(JS::Int32Value(RandomNumericLimit<int>()));
} else {
aOutMutationValue.set(JS::Int32Value(RandomInteger<int>()));
}
MSGMGR_FUZZER_LOG("%*s! Mutated value of type |int32|: '%d' to '%d'",
aRecursionCounter * 4, "", aValue.toInt32(),
aOutMutationValue.toInt32());
return true;
}
if (aValue.isDouble()) {
aOutMutationValue.set(JS::DoubleValue(RandomFloatingPoint<double>()));
MSGMGR_FUZZER_LOG("%*s! Mutated value of type |double|: '%f' to '%f'",
aRecursionCounter * 4, "", aValue.toDouble(),
aOutMutationValue.toDouble());
return true;
}
if (aValue.isBoolean()) {
aOutMutationValue.set(JS::BooleanValue(bool(RandomIntegerRange(0, 2))));
MSGMGR_FUZZER_LOG("%*s! Mutated value of type |boolean|: '%d' to '%d'",
aRecursionCounter * 4, "", aValue.toBoolean(),
aOutMutationValue.toBoolean());
return true;
}
if (aValue.isString()) {
nsCString x = GetFuzzValueFromFile();
if (x.IsEmpty()) {
return false;
}
JSString* str = JS_NewStringCopyZ(aCx, x.get());
aOutMutationValue.set(JS::StringValue(str));
JS::Rooted<JSString*> rootedValue(aCx, aValue.toString());
JS::UniqueChars valueChars = JS_EncodeStringToUTF8(aCx, rootedValue);
MSGMGR_FUZZER_LOG("%*s! Mutated value of type |string|: '%s' to '%s'",
aRecursionCounter * 4, "", valueChars.get(), x.get());
return true;
}
if (aValue.isObject()) {
aRecursionCounter++;
MSGMGR_FUZZER_LOG("%*s<Enumerating found object>", aRecursionCounter * 4,
"");
MutateObject(aCx, aValue, aRecursionCounter);
aOutMutationValue.set(aValue);
return true;
}
return false;
}
/* static */
bool MessageManagerFuzzer::Mutate(JSContext* aCx, const nsAString& aMessageName,
ipc::StructuredCloneData* aData,
const JS::Value& aTransfer) {
MSGMGR_FUZZER_LOG("Message: %s in process: %d",
NS_ConvertUTF16toUTF8(aMessageName).get(),
XRE_GetProcessType());
unsigned short int aRecursionCounter = 0;
ErrorResult rv;
JS::Rooted<JS::Value> t(aCx, aTransfer);
/* Read original StructuredCloneData. */
JS::Rooted<JS::Value> scdContent(aCx);
aData->Read(aCx, &scdContent, rv);
if (NS_WARN_IF(rv.Failed())) {
rv.SuppressException();
JS_ClearPendingException(aCx);
return false;
}
JS::Rooted<JS::Value> scdMutationContent(aCx);
bool isMutated =
MutateValue(aCx, scdContent, &scdMutationContent, aRecursionCounter);
/* Write mutated StructuredCloneData. */
ipc::StructuredCloneData mutatedStructuredCloneData;
mutatedStructuredCloneData.Write(aCx, scdMutationContent, t,
JS::CloneDataPolicy(), rv);
if (NS_WARN_IF(rv.Failed())) {
rv.SuppressException();
JS_ClearPendingException(aCx);
return false;
}
aData->Copy(mutatedStructuredCloneData);
/* Mutated and successfully written to StructuredCloneData object. */
if (isMutated) {
JS::Rooted<JSString*> str(aCx, JS_ValueToSource(aCx, scdMutationContent));
JS::UniqueChars strChars = JS_EncodeStringToUTF8(aCx, str);
MSGMGR_FUZZER_LOG("Mutated '%s' Message: %s",
NS_ConvertUTF16toUTF8(aMessageName).get(),
strChars.get());
}
return true;
}
/* static */
unsigned int MessageManagerFuzzer::DefaultMutationProbability() {
static unsigned long sPropValue =
MESSAGEMANAGER_FUZZER_DEFAULT_MUTATION_PROBABILITY;
static bool sInitialized = false;
if (sInitialized) {
return sPropValue;
}
sInitialized = true;
// Defines the likelihood of fuzzing a message.
const char* probability =
PR_GetEnv("MESSAGEMANAGER_FUZZER_MUTATION_PROBABILITY");
if (probability) {
long n = std::strtol(probability, nullptr, 10);
if (n != 0) {
sPropValue = n;
return sPropValue;
}
}
return sPropValue;
}
/* static */
bool MessageManagerFuzzer::IsLoggingEnabled() {
static bool sInitialized = false;
static bool sIsLoggingEnabled = false;
if (!sInitialized) {
sIsLoggingEnabled = !!PR_GetEnv("MESSAGEMANAGER_FUZZER_ENABLE_LOGGING");
sInitialized = true;
}
return sIsLoggingEnabled;
}
/* static */
bool MessageManagerFuzzer::IsEnabled() {
return !!PR_GetEnv("MESSAGEMANAGER_FUZZER_ENABLE") && XRE_IsContentProcess();
}
/* static */
void MessageManagerFuzzer::TryMutate(JSContext* aCx,
const nsAString& aMessageName,
ipc::StructuredCloneData* aData,
const JS::Value& aTransfer) {
if (!IsEnabled()) {
return;
}
if (IsMessageNameBlacklisted(aMessageName)) {
MSGMGR_FUZZER_LOG("Blacklisted message: %s",
NS_ConvertUTF16toUTF8(aMessageName).get());
return;
}
Mutate(aCx, aMessageName, aData, aTransfer);
}
} // namespace dom
} // namespace mozilla