0b2edc4097
The fuzzer found a couple of cases that exploited comments of the
form:
function test() {
const re = /*.../;
const str = '...*/...';
let result;
try { result = re.exec(str); } catch (e) { /* ... */ }
}
Note that the first line does not contain a regexp literal, it starts
a comment instead. The second line terminates the comment.
This fixes detection of such cases by initializing `result` to null.
TBR=yangguo@chromium.org
Bug: chromium:805970
Change-Id: I5d46db9892e2b4e71cdc2907cebf07a2e33b7a0e
Reviewed-on: https://chromium-review.googlesource.com/894403
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50991}
438 lines
15 KiB
C++
438 lines
15 KiB
C++
// Copyright 2017 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include <limits.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <functional>
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#include <string>
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#include "include/v8.h"
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#include "src/factory.h"
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#include "src/objects-inl.h"
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#include "src/objects.h"
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#include "src/regexp/jsregexp.h"
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#include "test/fuzzer/fuzzer-support.h"
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// This is a hexdump of test/fuzzer/regexp_builtins/mjsunit.js generated using
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// `xxd -i mjsunit.js`. It contains the `assertEquals` JS function used below.
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#include "test/fuzzer/regexp_builtins/mjsunit.js.h"
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namespace v8 {
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namespace internal {
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namespace {
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constexpr bool kVerbose = false; // For debugging, verbose error messages.
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#define REGEXP_BUILTINS(V) \
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V(Exec, exec) \
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V(Match, Symbol.match) \
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V(Replace, Symbol.replace) \
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V(Search, Symbol.search) \
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V(Split, Symbol.split) \
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V(Test, test)
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struct FuzzerArgs {
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FuzzerArgs(const uint8_t* input_data, size_t input_length,
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v8::Local<v8::Context> context, Isolate* isolate)
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: input_cursor(0),
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input_data(input_data),
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input_length(input_length),
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context(context),
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isolate(isolate) {}
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size_t input_cursor;
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const uint8_t* const input_data;
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const size_t input_length;
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v8::Local<v8::Context> context;
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Isolate* const isolate;
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};
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enum RegExpBuiltin {
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#define CASE(name, ...) kRegExpPrototype##name,
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REGEXP_BUILTINS(CASE)
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#undef CASE
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kRegExpBuiltinCount,
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};
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#define CASE(name, ...) void TestRegExpPrototype##name(FuzzerArgs* args);
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REGEXP_BUILTINS(CASE)
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#undef CASE
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v8::Local<v8::String> v8_str(const char* s) {
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return v8::String::NewFromUtf8(v8::Isolate::GetCurrent(), s,
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v8::NewStringType::kNormal)
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.ToLocalChecked();
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}
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v8::MaybeLocal<v8::Value> CompileRun(v8::Local<v8::Context> context,
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const char* source) {
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v8::Local<v8::Script> script;
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v8::MaybeLocal<v8::Script> maybe_script =
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v8::Script::Compile(context, v8_str(source));
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if (!maybe_script.ToLocal(&script)) return v8::MaybeLocal<v8::Value>();
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return script->Run(context);
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}
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uint8_t RandomByte(FuzzerArgs* args) {
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// Silently wraps to the beginning of input data. Ideally, input data should
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// be long enough to avoid that.
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const size_t index = args->input_cursor;
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CHECK(index < args->input_length);
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args->input_cursor = (index + 1) % args->input_length;
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return args->input_data[index];
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}
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void CompileMjsunit(const FuzzerArgs* args) {
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std::string source(
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reinterpret_cast<const char*>(test_fuzzer_regexp_builtins_mjsunit_js),
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test_fuzzer_regexp_builtins_mjsunit_js_len);
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CompileRun(args->context, source.c_str()).ToLocalChecked();
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}
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std::string NaiveEscape(const std::string& input, char escaped_char) {
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std::string out;
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for (size_t i = 0; i < input.size(); i++) {
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// Just omit newlines and \0 chars and naively replace other escaped chars.
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const char c = input[i];
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if (c == '\r' || c == '\n' || c == '\0') continue;
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out += (input[i] == escaped_char) ? '_' : c;
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}
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// Disallow trailing backslashes as they mess with our naive source string
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// concatenation.
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if (out.back() == '\\') out.back() = '_';
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return out;
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}
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std::string GenerateRandomString(FuzzerArgs* args, size_t length) {
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// Limited to an ASCII subset for now.
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std::string s(length, '\0');
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for (size_t i = 0; i < length; i++) {
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s[i] = static_cast<char>((RandomByte(args) % 0x5F) + 0x20);
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}
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return s;
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}
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std::string GenerateRandomPattern(FuzzerArgs* args) {
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const int kMaxPatternLength = 16;
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return GenerateRandomString(args, (RandomByte(args) % kMaxPatternLength) + 1);
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}
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std::string PickRandomPresetPattern(FuzzerArgs* args) {
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static const char* preset_patterns[] = {
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".", // Always matches.
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"\\P{Any}", // Never matches.
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"^", // Zero-width assertion, matches once.
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"(?=.)", // Zero-width assertion, matches at every position.
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"\\b", // Zero-width assertion, matches at each word boundary.
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"()", // Zero-width assertion, matches at every position with groups.
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"(?<a>)", // Likewise but with named groups.
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"((((.).).).)", "(?<a>(?<b>(?<c>(?<d>.).).).)",
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// Copied from
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// https://cs.chromium.org/chromium/src/testing/libfuzzer/fuzzers/dicts/regexp.dict
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"?", "abc", "()", "[]", "abc|def", "abc|def|ghi", "^xxx$",
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"ab\\b\\d\\bcd", "\\w|\\d", "a*?", "abc+", "abc+?", "xyz?", "xyz??",
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"xyz{0,1}", "xyz{0,1}?", "xyz{93}", "xyz{1,32}", "xyz{1,32}?", "xyz{1,}",
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"xyz{1,}?", "a\\fb\\nc\\rd\\te\\vf", "a\\nb\\bc", "(?:foo)", "(?: foo )",
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"foo|(bar|baz)|quux", "foo(?=bar)baz", "foo(?!bar)baz", "foo(?<=bar)baz",
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"foo(?<!bar)baz", "()", "(?=)", "[]", "[x]", "[xyz]", "[a-zA-Z0-9]",
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"[-123]", "[^123]", "]", "}", "[a-b-c]", "[x\\dz]", "[\\d-z]",
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"[\\d-\\d]", "[z-\\d]", "\\cj\\cJ\\ci\\cI\\ck\\cK", "\\c!", "\\c_",
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"\\c~", "[\\c!]", "[\\c_]", "[\\c~]", "[\\ca]", "[\\cz]", "[\\cA]",
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"[\\cZ]", "[\\c1]", "\\[\\]\\{\\}\\(\\)\\%\\^\\#\\ ",
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"[\\[\\]\\{\\}\\(\\)\\%\\^\\#\\ ]", "\\8", "\\9", "\\11", "\\11a",
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"\\011", "\\118", "\\111", "\\1111", "(x)(x)(x)\\1", "(x)(x)(x)\\2",
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"(x)(x)(x)\\3", "(x)(x)(x)\\4", "(x)(x)(x)\\1*", "(x)(x)(x)\\3*",
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"(x)(x)(x)\\4*", "(x)(x)(x)(x)(x)(x)(x)(x)(x)(x)\\10",
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"(x)(x)(x)(x)(x)(x)(x)(x)(x)(x)\\11", "(a)\\1", "(a\\1)", "(\\1a)",
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"(\\2)(\\1)", "(?=a){0,10}a", "(?=a){1,10}a", "(?=a){9,10}a", "(?!a)?a",
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"\\1(a)", "(?!(a))\\1", "(?!\\1(a\\1)\\1)\\1",
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"\\1\\2(a(?:\\1(b\\1\\2))\\2)\\1", "[\\0]", "[\\11]", "[\\11a]",
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"[\\011]", "[\\00011]", "[\\118]", "[\\111]", "[\\1111]", "\\x60",
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"\\x3z", "\\c", "\\u0034", "\\u003z", "foo[z]*", "\\u{12345}",
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"\\u{12345}\\u{23456}", "\\u{12345}{3}", "\\u{12345}*", "\\ud808\\udf45*",
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"[\\ud808\\udf45-\\ud809\\udccc]", "a", "a|b", "a\\n", "a$", "a\\b!",
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"a\\Bb", "a*?", "a?", "a??", "a{0,1}?", "a{1,2}?", "a+?", "(a)", "(a)\\1",
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"(\\1a)", "\\1(a)", "a\\s", "a\\S", "a\\D", "a\\w", "a\\W", "a.", "a\\q",
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"a[a]", "a[^a]", "a[a-z]", "a(?:b)", "a(?=b)", "a(?!b)", "\\x60",
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"\\u0060", "\\cA", "\\q", "\\1112", "(a)\\1", "(?!a)?a\\1",
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"(?:(?=a))a\\1", "a{}", "a{,}", "a{", "a{z}", "a{12z}", "a{12,",
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"a{12,3b", "{}", "{,}", "{", "{z}", "{1z}", "{12,", "{12,3b", "a", "abc",
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"a[bc]d", "a|bc", "ab|c", "a||bc", "(?:ab)", "(?:ab|cde)", "(?:ab)|cde",
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"(ab)", "(ab|cde)", "(ab)\\1", "(ab|cde)\\1", "(?:ab)?", "(?:ab)+", "a?",
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"a+", "a??", "a*?", "a+?", "(?:a?)?", "(?:a+)?", "(?:a?)+", "(?:a*)+",
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"(?:a+)+", "(?:a?)*", "(?:a*)*", "(?:a+)*", "a{0}", "(?:a+){0,0}", "a*b",
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"a+b", "a*b|c", "a+b|c", "(?:a{5,1000000}){3,1000000}", "(?:ab){4,7}",
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"a\\bc", "a\\sc", "a\\Sc", "a(?=b)c", "a(?=bbb|bb)c", "a(?!bbb|bb)c",
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"\xe2\x81\xa3", "[\xe2\x81\xa3]", "\xed\xb0\x80", "\xed\xa0\x80",
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"(\xed\xb0\x80)\x01", "((\xed\xa0\x80))\x02", "\xf0\x9f\x92\xa9", "\x01",
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"\x0f", "[-\xf0\x9f\x92\xa9]+", "[\xf0\x9f\x92\xa9-\xf4\x8f\xbf\xbf]",
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"(?<=)", "(?<=a)", "(?<!)", "(?<!a)", "(?<a>)", "(?<a>.)",
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"(?<a>.)\\k<a>", "\\p{Script=Greek}", "\\P{sc=Greek}",
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"\\p{Script_Extensions=Greek}", "\\P{scx=Greek}",
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"\\p{General_Category=Decimal_Number}", "\\P{gc=Decimal_Number}",
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"\\p{gc=Nd}", "\\P{Decimal_Number}", "\\p{Nd}", "\\P{Any}",
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"\\p{Changes_When_NFKC_Casefolded}",
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};
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static constexpr int preset_pattern_count = arraysize(preset_patterns);
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STATIC_ASSERT(preset_pattern_count < 0xFF);
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return std::string(preset_patterns[RandomByte(args) % preset_pattern_count]);
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}
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std::string PickPattern(FuzzerArgs* args) {
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if ((RandomByte(args) & 3) == 0) {
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return NaiveEscape(GenerateRandomPattern(args), '/');
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} else {
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return PickRandomPresetPattern(args);
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}
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}
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std::string GenerateRandomString(FuzzerArgs* args) {
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const int kMaxStringLength = 64;
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return GenerateRandomString(args, RandomByte(args) % kMaxStringLength);
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}
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std::string PickSubjectString(FuzzerArgs* args) {
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if ((RandomByte(args) & 0xF) == 0) {
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// Sometimes we have a two-byte subject string.
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return "f\\uD83D\\uDCA9ba\\u2603";
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} else {
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return NaiveEscape(GenerateRandomString(args), '\'');
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}
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}
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std::string PickReplacementForReplace(FuzzerArgs* args) {
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static const char* candidates[] = {
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"'X'",
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"'$1$2$3'",
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"'$$$&$`$\\'$1'",
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"() => 'X'",
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"(arg0, arg1, arg2, arg3, arg4) => arg0 + arg1 + arg2 + arg3 + arg4",
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"() => 42",
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};
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static const int candidate_count = arraysize(candidates);
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if ((RandomByte(args) & 1) == 0) {
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return candidates[RandomByte(args) % candidate_count];
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} else {
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return std::string("'") + NaiveEscape(GenerateRandomString(args), '\'') +
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std::string("'");
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}
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}
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std::string PickLimitForSplit(FuzzerArgs* args) {
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// clang-format off
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switch (RandomByte(args) & 0x3) {
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case 0: return "undefined";
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case 1: return "'not a number'";
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case 2: return std::to_string(Smi::kMaxValue + RandomByte(args));
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case 3: return std::to_string(RandomByte(args));
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default: UNREACHABLE();
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} // clang-format on
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}
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std::string GenerateRandomFlags(FuzzerArgs* args) {
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constexpr size_t kFlagCount = JSRegExp::FlagCount();
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CHECK_EQ(JSRegExp::kDotAll, 1 << (kFlagCount - 1));
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STATIC_ASSERT((1 << kFlagCount) - 1 < 0xFF);
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const size_t flags = RandomByte(args) & ((1 << kFlagCount) - 1);
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int cursor = 0;
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char buffer[kFlagCount] = {'\0'};
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if (flags & JSRegExp::kGlobal) buffer[cursor++] = 'g';
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if (flags & JSRegExp::kIgnoreCase) buffer[cursor++] = 'i';
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if (flags & JSRegExp::kMultiline) buffer[cursor++] = 'm';
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if (flags & JSRegExp::kSticky) buffer[cursor++] = 'y';
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if (flags & JSRegExp::kUnicode) buffer[cursor++] = 'u';
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if (flags & JSRegExp::kDotAll) buffer[cursor++] = 's';
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return std::string(buffer, cursor);
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}
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std::string GenerateRandomLastIndex(FuzzerArgs* args) {
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static const char* candidates[] = {
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"undefined", "-1", "0",
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"1", "2", "3",
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"4", "5", "6",
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"7", "8", "9",
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"50", "4294967296", "2147483647",
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"2147483648", "NaN", "Not a Number",
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};
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static const int candidate_count = arraysize(candidates);
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return candidates[RandomByte(args) % candidate_count];
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}
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void RunTest(FuzzerArgs* args) {
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switch (RandomByte(args) % kRegExpBuiltinCount) {
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#define CASE(name, ...) \
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case kRegExpPrototype##name: \
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TestRegExpPrototype##name(args); \
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break;
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REGEXP_BUILTINS(CASE)
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#undef CASE
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default:
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UNREACHABLE();
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}
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}
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std::string GenerateSourceString(FuzzerArgs* args, const std::string& test) {
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std::string pattern = PickPattern(args);
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std::string flags = GenerateRandomFlags(args);
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std::string last_index = GenerateRandomLastIndex(args);
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std::string subject = PickSubjectString(args);
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// clang-format off
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std::stringstream ss;
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ss << "function test() {\n"
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<< " const re = /" << pattern<< "/"
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<< flags << ";\n"
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<< " re.lastIndex = " << last_index << ";\n"
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<< " const str = '" << subject << "';\n"
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<< " let result = null;\n"
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<< " let exception = null;\n"
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<< " try {\n"
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<< " result = " << test << "\n"
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<< " } catch (e) {\n"
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<< " exception = e;\n"
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<< " }\n"
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<< " return { result: result, re: re, exception: exception };\n"
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<< "}\n"
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<< "%SetForceSlowPath(false);\n"
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<< "test(); // Run once ahead of time to compile the regexp.\n"
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<< "const fast = test();\n"
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<< "%SetForceSlowPath(true);\n"
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<< "const slow = test();\n"
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<< "%SetForceSlowPath(false);\n";
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// clang-format on
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return ss.str();
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}
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void PrintExceptionMessage(v8::TryCatch* try_catch) {
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CHECK(try_catch->HasCaught());
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static const int kBufferLength = 256;
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char buffer[kBufferLength + 1];
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try_catch->Message()->Get()->WriteOneByte(
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reinterpret_cast<uint8_t*>(&buffer[0]), 0, kBufferLength);
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fprintf(stderr, "%s\n", buffer);
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}
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bool ResultsAreIdentical(FuzzerArgs* args) {
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std::string source =
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"assertEquals(fast.exception, slow.exception);\n"
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"assertEquals(fast.result, slow.result);\n"
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"if (fast.result !== null)\n"
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" assertEquals(fast.result.groups, slow.result.groups);\n"
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"assertEquals(fast.re.lastIndex, slow.re.lastIndex);\n";
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v8::Local<v8::Value> result;
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v8::TryCatch try_catch(reinterpret_cast<v8::Isolate*>(args->isolate));
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if (!CompileRun(args->context, source.c_str()).ToLocal(&result)) {
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PrintExceptionMessage(&try_catch);
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args->isolate->clear_pending_exception();
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return false;
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}
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return true;
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}
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void CompileRunAndVerify(FuzzerArgs* args, const std::string& source) {
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v8::Local<v8::Value> result;
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v8::TryCatch try_catch(reinterpret_cast<v8::Isolate*>(args->isolate));
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if (!CompileRun(args->context, source.c_str()).ToLocal(&result)) {
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args->isolate->clear_pending_exception();
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// No need to verify result if an exception was thrown here, since that
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// implies a syntax error somewhere in the pattern or string. We simply
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// ignore those.
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if (kVerbose) {
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PrintExceptionMessage(&try_catch);
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fprintf(stderr, "Failed to run script:\n```\n%s\n```\n", source.c_str());
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}
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return;
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}
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CHECK(ResultsAreIdentical(args));
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}
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void TestRegExpPrototypeExec(FuzzerArgs* args) {
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std::string test = "re.exec(str);";
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std::string source = GenerateSourceString(args, test);
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CompileRunAndVerify(args, source);
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}
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void TestRegExpPrototypeMatch(FuzzerArgs* args) {
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std::string test = "re[Symbol.match](str);";
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std::string source = GenerateSourceString(args, test);
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CompileRunAndVerify(args, source);
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}
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void TestRegExpPrototypeReplace(FuzzerArgs* args) {
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std::string replacement = PickReplacementForReplace(args);
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std::string test = "re[Symbol.replace](str, " + replacement + ");";
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std::string source = GenerateSourceString(args, test);
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CompileRunAndVerify(args, source);
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}
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void TestRegExpPrototypeSearch(FuzzerArgs* args) {
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std::string test = "re[Symbol.search](str);";
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std::string source = GenerateSourceString(args, test);
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CompileRunAndVerify(args, source);
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}
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void TestRegExpPrototypeSplit(FuzzerArgs* args) {
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std::string limit = PickLimitForSplit(args);
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std::string test = "re[Symbol.split](str, " + limit + ");";
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std::string source = GenerateSourceString(args, test);
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CompileRunAndVerify(args, source);
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}
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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
|