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// Copyright 2017 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <limits.h>
#include <stddef.h>
#include <stdint.h>
#include <functional>
#include <string>
#include "include/v8.h"
#include "src/heap/factory.h"
#include "src/objects/objects-inl.h"
#include "src/regexp/regexp.h"
#include "test/fuzzer/fuzzer-support.h"
// This is a hexdump of test/fuzzer/regexp_builtins/mjsunit.js generated using
// `xxd -i mjsunit.js`. It contains the `assertEquals` JS function used below.
#include "test/fuzzer/regexp_builtins/mjsunit.js.h"
namespace v8 {
namespace internal {
namespace {
constexpr bool kVerbose = false; // For debugging, verbose error messages.
constexpr uint32_t kRegExpBuiltinsFuzzerHashSeed = 83;
#define REGEXP_BUILTINS(V) \
V(Exec, exec) \
V(Match, Symbol.match) \
V(Replace, Symbol.replace) \
V(Search, Symbol.search) \
V(Split, Symbol.split) \
V(Test, test)
struct FuzzerArgs {
FuzzerArgs(const uint8_t* input_data, size_t input_length,
v8::Local<v8::Context> context, Isolate* isolate)
: input_cursor(0),
input_data(input_data),
input_length(input_length),
context(context),
isolate(isolate) {}
size_t input_cursor;
const uint8_t* const input_data;
const size_t input_length;
v8::Local<v8::Context> context;
Isolate* const isolate;
};
enum RegExpBuiltin {
#define CASE(name, ...) kRegExpPrototype##name,
REGEXP_BUILTINS(CASE)
#undef CASE
kRegExpBuiltinCount,
};
#define CASE(name, ...) void TestRegExpPrototype##name(FuzzerArgs* args);
REGEXP_BUILTINS(CASE)
#undef CASE
v8::Local<v8::String> v8_str(v8::Isolate* isolate, const char* s) {
return v8::String::NewFromUtf8(isolate, s, v8::NewStringType::kNormal)
.ToLocalChecked();
}
v8::MaybeLocal<v8::Value> CompileRun(v8::Local<v8::Context> context,
const char* source) {
v8::Local<v8::Script> script;
v8::MaybeLocal<v8::Script> maybe_script =
v8::Script::Compile(context, v8_str(context->GetIsolate(), source));
if (!maybe_script.ToLocal(&script)) return v8::MaybeLocal<v8::Value>();
return script->Run(context);
}
uint8_t RandomByte(FuzzerArgs* args) {
// Silently wraps to the beginning of input data. Ideally, input data should
// be long enough to avoid that.
const size_t index = args->input_cursor;
CHECK(index < args->input_length);
args->input_cursor = (index + 1) % args->input_length;
return args->input_data[index];
}
void CompileMjsunit(const FuzzerArgs* args) {
std::string source(
reinterpret_cast<const char*>(test_fuzzer_regexp_builtins_mjsunit_js),
test_fuzzer_regexp_builtins_mjsunit_js_len);
CompileRun(args->context, source.c_str()).ToLocalChecked();
}
std::string NaiveEscape(const std::string& input, char escaped_char) {
std::string out;
for (size_t i = 0; i < input.size(); i++) {
// Just omit newlines and \0 chars and naively replace other escaped chars.
const char c = input[i];
if (c == '\r' || c == '\n' || c == '\0') continue;
out += (input[i] == escaped_char) ? '_' : c;
}
// Disallow trailing backslashes as they mess with our naive source string
// concatenation.
if (!out.empty() && out.back() == '\\') out.back() = '_';
return out;
}
std::string GenerateRandomString(FuzzerArgs* args, size_t length) {
// Limited to an ASCII subset for now.
std::string s(length, '\0');
for (size_t i = 0; i < length; i++) {
s[i] = static_cast<char>((RandomByte(args) % 0x5F) + 0x20);
}
return s;
}
std::string GenerateRandomPattern(FuzzerArgs* args) {
const int kMaxPatternLength = 16;
std::string s =
GenerateRandomString(args, (RandomByte(args) % kMaxPatternLength) + 1);
// A leading '*' would be a comment instead of a regexp literal.
if (s[0] == '*') s[0] = '.';
return s;
}
std::string PickRandomPresetPattern(FuzzerArgs* args) {
static const char* preset_patterns[] = {
".", // Always matches.
"\\P{Any}", // Never matches.
"^", // Zero-width assertion, matches once.
"(?=.)", // Zero-width assertion, matches at every position.
"\\b", // Zero-width assertion, matches at each word boundary.
"()", // Zero-width assertion, matches at every position with groups.
"(?<a>)", // Likewise but with named groups.
"((((.).).).)", "(?<a>(?<b>(?<c>(?<d>.).).).)",
// Copied from
// https://cs.chromium.org/chromium/src/testing/libfuzzer/fuzzers/dicts/regexp.dict
"?", "abc", "()", "[]", "abc|def", "abc|def|ghi", "^xxx$",
"ab\\b\\d\\bcd", "\\w|\\d", "a*?", "abc+", "abc+?", "xyz?", "xyz??",
"xyz{0,1}", "xyz{0,1}?", "xyz{93}", "xyz{1,32}", "xyz{1,32}?", "xyz{1,}",
"xyz{1,}?", "a\\fb\\nc\\rd\\te\\vf", "a\\nb\\bc", "(?:foo)", "(?: foo )",
"foo|(bar|baz)|quux", "foo(?=bar)baz", "foo(?!bar)baz", "foo(?<=bar)baz",
"foo(?<!bar)baz", "()", "(?=)", "[]", "[x]", "[xyz]", "[a-zA-Z0-9]",
"[-123]", "[^123]", "]", "}", "[a-b-c]", "[x\\dz]", "[\\d-z]",
"[\\d-\\d]", "[z-\\d]", "\\cj\\cJ\\ci\\cI\\ck\\cK", "\\c!", "\\c_",
"\\c~", "[\\c!]", "[\\c_]", "[\\c~]", "[\\ca]", "[\\cz]", "[\\cA]",
"[\\cZ]", "[\\c1]", "\\[\\]\\{\\}\\(\\)\\%\\^\\#\\ ",
"[\\[\\]\\{\\}\\(\\)\\%\\^\\#\\ ]", "\\8", "\\9", "\\11", "\\11a",
"\\011", "\\118", "\\111", "\\1111", "(x)(x)(x)\\1", "(x)(x)(x)\\2",
"(x)(x)(x)\\3", "(x)(x)(x)\\4", "(x)(x)(x)\\1*", "(x)(x)(x)\\3*",
"(x)(x)(x)\\4*", "(x)(x)(x)(x)(x)(x)(x)(x)(x)(x)\\10",
"(x)(x)(x)(x)(x)(x)(x)(x)(x)(x)\\11", "(a)\\1", "(a\\1)", "(\\1a)",
"(\\2)(\\1)", "(?=a){0,10}a", "(?=a){1,10}a", "(?=a){9,10}a", "(?!a)?a",
"\\1(a)", "(?!(a))\\1", "(?!\\1(a\\1)\\1)\\1",
"\\1\\2(a(?:\\1(b\\1\\2))\\2)\\1", "[\\0]", "[\\11]", "[\\11a]",
"[\\011]", "[\\00011]", "[\\118]", "[\\111]", "[\\1111]", "\\x60",
"\\x3z", "\\c", "\\u0034", "\\u003z", "foo[z]*", "\\u{12345}",
"\\u{12345}\\u{23456}", "\\u{12345}{3}", "\\u{12345}*", "\\ud808\\udf45*",
"[\\ud808\\udf45-\\ud809\\udccc]", "a", "a|b", "a\\n", "a$", "a\\b!",
"a\\Bb", "a*?", "a?", "a??", "a{0,1}?", "a{1,2}?", "a+?", "(a)", "(a)\\1",
"(\\1a)", "\\1(a)", "a\\s", "a\\S", "a\\D", "a\\w", "a\\W", "a.", "a\\q",
"a[a]", "a[^a]", "a[a-z]", "a(?:b)", "a(?=b)", "a(?!b)", "\\x60",
"\\u0060", "\\cA", "\\q", "\\1112", "(a)\\1", "(?!a)?a\\1",
"(?:(?=a))a\\1", "a{}", "a{,}", "a{", "a{z}", "a{12z}", "a{12,",
"a{12,3b", "{}", "{,}", "{", "{z}", "{1z}", "{12,", "{12,3b", "a", "abc",
"a[bc]d", "a|bc", "ab|c", "a||bc", "(?:ab)", "(?:ab|cde)", "(?:ab)|cde",
"(ab)", "(ab|cde)", "(ab)\\1", "(ab|cde)\\1", "(?:ab)?", "(?:ab)+", "a?",
"a+", "a??", "a*?", "a+?", "(?:a?)?", "(?:a+)?", "(?:a?)+", "(?:a*)+",
"(?:a+)+", "(?:a?)*", "(?:a*)*", "(?:a+)*", "a{0}", "(?:a+){0,0}", "a*b",
"a+b", "a*b|c", "a+b|c", "(?:a{5,1000000}){3,1000000}", "(?:ab){4,7}",
"a\\bc", "a\\sc", "a\\Sc", "a(?=b)c", "a(?=bbb|bb)c", "a(?!bbb|bb)c",
"\xe2\x81\xa3", "[\xe2\x81\xa3]", "\xed\xb0\x80", "\xed\xa0\x80",
"(\xed\xb0\x80)\x01", "((\xed\xa0\x80))\x02", "\xf0\x9f\x92\xa9", "\x01",
"\x0f", "[-\xf0\x9f\x92\xa9]+", "[\xf0\x9f\x92\xa9-\xf4\x8f\xbf\xbf]",
"(?<=)", "(?<=a)", "(?<!)", "(?<!a)", "(?<a>)", "(?<a>.)",
"(?<a>.)\\k<a>", "\\p{Script=Greek}", "\\P{sc=Greek}",
"\\p{Script_Extensions=Greek}", "\\P{scx=Greek}",
"\\p{General_Category=Decimal_Number}", "\\P{gc=Decimal_Number}",
"\\p{gc=Nd}", "\\P{Decimal_Number}", "\\p{Nd}", "\\P{Any}",
"\\p{Changes_When_NFKC_Casefolded}",
};
static constexpr int preset_pattern_count = arraysize(preset_patterns);
STATIC_ASSERT(preset_pattern_count < 0xFF);
return std::string(preset_patterns[RandomByte(args) % preset_pattern_count]);
}
std::string PickPattern(FuzzerArgs* args) {
if ((RandomByte(args) & 3) == 0) {
return NaiveEscape(GenerateRandomPattern(args), '/');
} else {
return PickRandomPresetPattern(args);
}
}
std::string GenerateRandomString(FuzzerArgs* args) {
const int kMaxStringLength = 64;
return GenerateRandomString(args, RandomByte(args) % kMaxStringLength);
}
std::string PickSubjectString(FuzzerArgs* args) {
if ((RandomByte(args) & 0xF) == 0) {
// Sometimes we have a two-byte subject string.
return "f\\uD83D\\uDCA9ba\\u2603";
} else {
return NaiveEscape(GenerateRandomString(args), '\'');
}
}
std::string PickReplacementForReplace(FuzzerArgs* args) {
static const char* candidates[] = {
"'X'",
"'$1$2$3'",
"'$$$&$`$\\'$1'",
"() => 'X'",
"(arg0, arg1, arg2, arg3, arg4) => arg0 + arg1 + arg2 + arg3 + arg4",
"() => 42",
};
static const int candidate_count = arraysize(candidates);
if ((RandomByte(args) & 1) == 0) {
return candidates[RandomByte(args) % candidate_count];
} else {
return std::string("'") + NaiveEscape(GenerateRandomString(args), '\'') +
std::string("'");
}
}
std::string PickLimitForSplit(FuzzerArgs* args) {
// clang-format off
switch (RandomByte(args) & 0x3) {
case 0: return "undefined";
case 1: return "'not a number'";
case 2: return std::to_string(Smi::kMaxValue + RandomByte(args));
case 3: return std::to_string(RandomByte(args));
default: UNREACHABLE();
} // clang-format on
}
std::string GenerateRandomFlags(FuzzerArgs* args) {
constexpr size_t kFlagCount = JSRegExp::kFlagCount;
CHECK_EQ(JSRegExp::kDotAll, 1 << (kFlagCount - 1));
STATIC_ASSERT((1 << kFlagCount) - 1 < 0xFF);
const size_t flags = RandomByte(args) & ((1 << kFlagCount) - 1);
int cursor = 0;
char buffer[kFlagCount] = {'\0'};
if (flags & JSRegExp::kGlobal) buffer[cursor++] = 'g';
if (flags & JSRegExp::kIgnoreCase) buffer[cursor++] = 'i';
if (flags & JSRegExp::kMultiline) buffer[cursor++] = 'm';
if (flags & JSRegExp::kSticky) buffer[cursor++] = 'y';
if (flags & JSRegExp::kUnicode) buffer[cursor++] = 'u';
if (flags & JSRegExp::kDotAll) buffer[cursor++] = 's';
return std::string(buffer, cursor);
}
std::string GenerateRandomLastIndex(FuzzerArgs* args) {
static const char* candidates[] = {
"undefined", "-1", "0",
"1", "2", "3",
"4", "5", "6",
"7", "8", "9",
"50", "4294967296", "2147483647",
"2147483648", "NaN", "Not a Number",
};
static const int candidate_count = arraysize(candidates);
return candidates[RandomByte(args) % candidate_count];
}
void RunTest(FuzzerArgs* args) {
switch (RandomByte(args) % kRegExpBuiltinCount) {
#define CASE(name, ...) \
case kRegExpPrototype##name: \
TestRegExpPrototype##name(args); \
break;
REGEXP_BUILTINS(CASE)
#undef CASE
default:
UNREACHABLE();
}
}
std::string GenerateSourceString(FuzzerArgs* args, const std::string& test) {
std::string pattern = PickPattern(args);
std::string flags = GenerateRandomFlags(args);
std::string last_index = GenerateRandomLastIndex(args);
std::string subject = PickSubjectString(args);
// clang-format off
std::stringstream ss;
ss << "function test() {\n"
<< " const re = /" << pattern<< "/"
<< flags << ";\n"
<< " re.lastIndex = " << last_index << ";\n"
<< " const str = '" << subject << "';\n"
<< " let result = null;\n"
<< " let exception = null;\n"
<< " try {\n"
<< " result = " << test << "\n"
<< " } catch (e) {\n"
<< " exception = e;\n"
<< " }\n"
<< " return { result: result, re: re, exception: exception };\n"
<< "}\n"
<< "%SetForceSlowPath(false);\n"
<< "test(); // Run once ahead of time to compile the regexp.\n"
<< "const fast = test();\n"
<< "%SetForceSlowPath(true);\n"
<< "const slow = test();\n"
<< "%SetForceSlowPath(false);\n";
// clang-format on
std::string source = ss.str();
if (kVerbose) {
fprintf(stderr, "Generated source:\n```\n%s\n```\n", source.c_str());
}
return source;
}
void PrintExceptionMessage(v8::Isolate* isolate, v8::TryCatch* try_catch) {
CHECK(try_catch->HasCaught());
static const int kBufferLength = 256;
char buffer[kBufferLength + 1];
try_catch->Message()->Get()->WriteOneByte(
isolate, reinterpret_cast<uint8_t*>(&buffer[0]), 0, kBufferLength);
fprintf(stderr, "%s\n", buffer);
}
bool ResultsAreIdentical(FuzzerArgs* args) {
std::string source =
"assertEquals(fast.exception, slow.exception);\n"
"assertEquals(fast.result, slow.result);\n"
"if (fast.result !== null) {\n"
" assertEquals(fast.result.groups, slow.result.groups);\n"
" assertEquals(fast.result.indices, slow.result.indices);\n"
" if (fast.result.indices !== undefined) {\n"
" assertEquals(fast.result.indices.groups,\n"
" slow.result.indices.groups);\n"
" }\n"
"}\n"
"assertEquals(fast.re.lastIndex, slow.re.lastIndex);\n";
v8::Local<v8::Value> result;
v8::Isolate* isolate = reinterpret_cast<v8::Isolate*>(args->isolate);
v8::TryCatch try_catch(isolate);
if (!CompileRun(args->context, source.c_str()).ToLocal(&result)) {
PrintExceptionMessage(isolate, &try_catch);
args->isolate->clear_pending_exception();
return false;
}
return true;
}
void CompileRunAndVerify(FuzzerArgs* args, const std::string& source) {
v8::Local<v8::Value> result;
v8::Isolate* isolate = reinterpret_cast<v8::Isolate*>(args->isolate);
v8::TryCatch try_catch(isolate);
if (!CompileRun(args->context, source.c_str()).ToLocal(&result)) {
args->isolate->clear_pending_exception();
// No need to verify result if an exception was thrown here, since that
// implies a syntax error somewhere in the pattern or string. We simply
// ignore those.
if (kVerbose) {
PrintExceptionMessage(isolate, &try_catch);
fprintf(stderr, "Failed to run script:\n```\n%s\n```\n", source.c_str());
}
return;
}
if (!ResultsAreIdentical(args)) {
uint32_t hash = StringHasher::HashSequentialString(
args->input_data, static_cast<int>(args->input_length),
kRegExpBuiltinsFuzzerHashSeed);
FATAL("!ResultAreIdentical(args); RegExpBuiltinsFuzzerHash=%x", hash);
}
}
void TestRegExpPrototypeExec(FuzzerArgs* args) {
std::string test = "re.exec(str);";
std::string source = GenerateSourceString(args, test);
CompileRunAndVerify(args, source);
}
void TestRegExpPrototypeMatch(FuzzerArgs* args) {
std::string test = "re[Symbol.match](str);";
std::string source = GenerateSourceString(args, test);
CompileRunAndVerify(args, source);
}
void TestRegExpPrototypeReplace(FuzzerArgs* args) {
std::string replacement = PickReplacementForReplace(args);
std::string test = "re[Symbol.replace](str, " + replacement + ");";
std::string source = GenerateSourceString(args, test);
CompileRunAndVerify(args, source);
}
void TestRegExpPrototypeSearch(FuzzerArgs* args) {
std::string test = "re[Symbol.search](str);";
std::string source = GenerateSourceString(args, test);
CompileRunAndVerify(args, source);
}
void TestRegExpPrototypeSplit(FuzzerArgs* args) {
std::string limit = PickLimitForSplit(args);
std::string test = "re[Symbol.split](str, " + limit + ");";
std::string source = GenerateSourceString(args, test);
CompileRunAndVerify(args, source);
}
void TestRegExpPrototypeTest(FuzzerArgs* args) {
std::string test = "re.test(str);";
std::string source = GenerateSourceString(args, test);
CompileRunAndVerify(args, source);
}
#undef REGEXP_BUILTINS
} // namespace
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
if (size < 64) return 0; // Need a minimal amount of randomness to do stuff.
// Flag definitions.
FLAG_allow_natives_syntax = true;
// V8 setup.
v8_fuzzer::FuzzerSupport* support = v8_fuzzer::FuzzerSupport::Get();
v8::Isolate* isolate = support->GetIsolate();
Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
v8::Isolate::Scope isolate_scope(isolate);
v8::HandleScope handle_scope(isolate);
v8::Local<v8::Context> context = support->GetContext();
v8::Context::Scope context_scope(context);
v8::TryCatch try_catch(isolate);
CHECK(!i_isolate->has_pending_exception());
// And run.
FuzzerArgs args(data, size, context, i_isolate);
CompileMjsunit(&args);
RunTest(&args);
CHECK(!i_isolate->has_pending_exception());
return 0;
}
} // namespace internal
} // namespace v8