5627e89956
Decode malformed UTF-8 consistently in UTF8Decoder::process() and UTF8Decoder::to_utf8(). This keeps lazy SourceCode decoding and bytecode cache source hashing in step with eager source text decoding when cached script source bytes contain invalid UTF-8. Cover UTF-8 encoded surrogate code points and overlong byte sequences in LibTextCodec, and add lazy SourceCode coverage for both cases.
487 lines
20 KiB
C++
487 lines
20 KiB
C++
/*
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* Copyright (c) 2026-present, the Ladybird developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/ScopeGuard.h>
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#include <LibCore/File.h>
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#include <LibCore/ImmutableBytes.h>
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#include <LibCore/StandardPaths.h>
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#include <LibCore/System.h>
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#include <LibCrypto/Hash/SHA2.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/ModuleRequest.h>
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#include <LibJS/Runtime/SharedFunctionInstanceData.h>
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#include <LibJS/Runtime/VM.h>
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#include <LibJS/RustIntegration.h>
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#include <LibJS/Script.h>
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#include <LibJS/SourceCode.h>
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#include <LibJS/SourceTextModule.h>
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#include <LibTest/TestCase.h>
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struct BytecodeCacheTestData {
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NonnullRefPtr<JS::SourceCode const> source_code;
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ByteBuffer blob;
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Crypto::Hash::SHA256::DigestType source_hash;
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};
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TEST_CASE(lazy_source_code_decoding_replaces_utf8_surrogates)
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{
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auto source_data = Vector<u8> { 0xed, 0xa0, 0x80 };
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auto source_bytes = TRY_OR_FAIL(Core::ImmutableBytes::copy(source_data.span()));
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auto source_code = JS::SourceCode::create("test.js"_string, 1, "UTF-8"_string, move(source_bytes));
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EXPECT_EQ(source_code->code().to_utf8(), "\xef\xbf\xbd"sv);
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EXPECT_EQ(source_code->source_text_from_offsets(0, 1).to_utf8(), "\xef\xbf\xbd"sv);
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}
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TEST_CASE(lazy_source_code_decoding_replaces_overlong_utf8_sequences)
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{
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auto source_data = Vector<u8> { 0xc0, 0x80 };
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auto source_bytes = TRY_OR_FAIL(Core::ImmutableBytes::copy(source_data.span()));
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auto source_code = JS::SourceCode::create("test.js"_string, 2, "UTF-8"_string, move(source_bytes));
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EXPECT_EQ(source_code->code().to_utf8(), "\xef\xbf\xbd\xef\xbf\xbd"sv);
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EXPECT_EQ(source_code->source_text_from_offsets(0, 2).to_utf8(), "\xef\xbf\xbd\xef\xbf\xbd"sv);
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}
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class BytecodeCacheBlobReader {
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public:
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explicit BytecodeCacheBlobReader(ReadonlyBytes bytes)
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: m_bytes(bytes)
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{
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}
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void skip(size_t length)
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{
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VERIFY(m_offset + length <= m_bytes.size());
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m_offset += length;
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}
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void align_to(size_t alignment)
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{
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auto padding = (alignment - (m_offset % alignment)) % alignment;
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skip(padding);
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}
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bool read_bool()
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{
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return read_u8() != 0;
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}
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u8 read_u8()
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{
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VERIFY(m_offset < m_bytes.size());
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return m_bytes[m_offset++];
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}
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u32 read_u32()
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{
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VERIFY(m_offset + sizeof(u32) <= m_bytes.size());
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auto value = static_cast<u32>(m_bytes[m_offset])
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| (static_cast<u32>(m_bytes[m_offset + 1]) << 8)
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| (static_cast<u32>(m_bytes[m_offset + 2]) << 16)
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| (static_cast<u32>(m_bytes[m_offset + 3]) << 24);
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m_offset += sizeof(u32);
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return value;
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}
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void skip_utf16()
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{
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align_to(alignof(u16));
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auto length = read_u32();
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skip(length * sizeof(u16));
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}
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void skip_utf16_vector()
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{
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auto length = read_u32();
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for (u32 i = 0; i < length; ++i)
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skip_utf16();
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}
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void skip_optional_utf16()
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{
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if (read_bool())
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skip_utf16();
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}
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void skip_optional_u32()
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{
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if (read_bool())
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skip(sizeof(u32));
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}
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size_t offset() const { return m_offset; }
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private:
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ReadonlyBytes m_bytes;
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size_t m_offset { 0 };
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};
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static void write_u32(ByteBuffer& bytes, size_t offset, u32 value)
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{
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VERIFY(offset + sizeof(u32) <= bytes.size());
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bytes[offset] = value & 0xff;
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bytes[offset + 1] = (value >> 8) & 0xff;
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bytes[offset + 2] = (value >> 16) & 0xff;
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bytes[offset + 3] = (value >> 24) & 0xff;
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}
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static BytecodeCacheTestData create_bytecode_cache_blob(StringView source)
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{
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auto source_code = JS::SourceCode::create("test.js"_string, Utf16String::from_utf8(source));
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auto source_hash = Crypto::Hash::SHA256::hash(reinterpret_cast<u8 const*>(source_code->utf16_data()), source_code->length_in_code_units() * sizeof(u16));
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auto* parsed = JS::RustIntegration::parse_program(source_code->utf16_data(), source_code->length_in_code_units(), JS::RustIntegration::ProgramType::Script);
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VERIFY(parsed);
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ArmedScopeGuard free_parsed = [&] {
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JS::RustIntegration::free_parsed_program(parsed);
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};
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EXPECT(!JS::RustIntegration::parsed_program_has_errors(parsed));
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auto* compiled = JS::RustIntegration::compile_parsed_program_fully_off_thread(parsed, source_code->length_in_code_units());
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VERIFY(compiled);
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free_parsed.disarm();
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ScopeGuard free_compiled = [&] {
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JS::RustIntegration::free_compiled_program(compiled);
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};
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auto blob = JS::RustIntegration::serialize_compiled_program_for_bytecode_cache(*compiled, JS::RustIntegration::ProgramType::Script, source_hash.bytes());
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VERIFY(!blob.is_empty());
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return {
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.source_code = source_code,
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.blob = move(blob),
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.source_hash = source_hash,
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};
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}
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static BytecodeCacheTestData create_module_bytecode_cache_blob(StringView source)
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{
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auto source_code = JS::SourceCode::create("test.mjs"_string, Utf16String::from_utf8(source));
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auto source_hash = Crypto::Hash::SHA256::hash(reinterpret_cast<u8 const*>(source_code->utf16_data()), source_code->length_in_code_units() * sizeof(u16));
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auto* parsed = JS::RustIntegration::parse_program(source_code->utf16_data(), source_code->length_in_code_units(), JS::RustIntegration::ProgramType::Module);
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VERIFY(parsed);
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ArmedScopeGuard free_parsed = [&] {
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JS::RustIntegration::free_parsed_program(parsed);
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};
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EXPECT(!JS::RustIntegration::parsed_program_has_errors(parsed));
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auto* compiled = JS::RustIntegration::compile_parsed_program_fully_off_thread(parsed, source_code->length_in_code_units());
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VERIFY(compiled);
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free_parsed.disarm();
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ScopeGuard free_compiled = [&] {
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JS::RustIntegration::free_compiled_program(compiled);
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};
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auto blob = JS::RustIntegration::serialize_compiled_program_for_bytecode_cache(*compiled, JS::RustIntegration::ProgramType::Module, source_hash.bytes());
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VERIFY(!blob.is_empty());
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return {
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.source_code = source_code,
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.blob = move(blob),
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.source_hash = source_hash,
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};
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}
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static size_t first_declaration_function_bytecode_payload_offset(ReadonlyBytes blob)
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{
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BytecodeCacheBlobReader reader { blob };
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reader.skip(8); // Magic.
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reader.skip(sizeof(u32)); // Format version.
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reader.skip(1); // Program type.
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reader.skip(32); // Source hash.
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reader.skip(1); // Has top-level await.
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reader.skip(1); // Is strict mode.
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EXPECT_EQ(reader.read_u8(), 0); // Script declaration metadata.
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reader.skip_utf16_vector(); // Lexical names.
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reader.skip_utf16_vector(); // Var names.
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reader.skip_utf16_vector(); // Function names.
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reader.skip_utf16_vector(); // Var-scoped names.
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reader.skip_utf16_vector(); // Annex B candidate names.
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auto lexical_binding_count = reader.read_u32();
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for (u32 i = 0; i < lexical_binding_count; ++i) {
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reader.skip_utf16();
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reader.skip(1);
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}
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auto declaration_function_count = reader.read_u32();
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VERIFY(declaration_function_count > 0);
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reader.skip_optional_utf16(); // Function name.
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reader.skip(sizeof(u32)); // Source text start.
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reader.skip(sizeof(u32)); // Source text end.
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reader.skip(sizeof(i32)); // Function length.
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reader.skip(sizeof(u32)); // Formal parameter count.
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reader.skip(1); // Function kind.
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reader.skip(1); // Strict mode.
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reader.skip(1); // Arrow function.
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if (reader.read_bool())
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reader.skip_utf16_vector();
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reader.skip(1); // Uses this.
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reader.skip(1); // Uses this from environment.
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if (reader.read_bool()) {
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reader.skip_utf16();
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reader.skip(1);
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}
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reader.skip(3); // Function metadata bools.
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reader.skip(sizeof(u64)); // Function environment bindings count.
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reader.skip(sizeof(u64)); // Var environment bindings count.
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reader.skip(2); // Function metadata bools.
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reader.align_to(alignof(u16));
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auto executable_length = reader.read_u32();
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VERIFY(executable_length > 0);
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reader.skip(1); // Executable strict mode.
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reader.skip(sizeof(u32)); // Number of registers.
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reader.skip(sizeof(u32)); // Number of arguments.
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reader.skip(5 * sizeof(u32)); // Cache counters.
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reader.skip(1); // This value needs environment resolution.
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reader.skip_optional_u32(); // Length identifier.
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auto bytecode_length = reader.read_u32();
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VERIFY(bytecode_length > 0);
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return reader.offset();
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}
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static size_t first_declaration_function_source_text_start_offset(ReadonlyBytes blob)
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{
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BytecodeCacheBlobReader reader { blob };
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reader.skip(8); // Magic.
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reader.skip(sizeof(u32)); // Format version.
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reader.skip(1); // Program type.
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reader.skip(32); // Source hash.
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reader.skip(1); // Has top-level await.
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reader.skip(1); // Is strict mode.
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EXPECT_EQ(reader.read_u8(), 0); // Script declaration metadata.
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reader.skip_utf16_vector(); // Lexical names.
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reader.skip_utf16_vector(); // Var names.
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reader.skip_utf16_vector(); // Function names.
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reader.skip_utf16_vector(); // Var-scoped names.
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reader.skip_utf16_vector(); // Annex B candidate names.
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auto lexical_binding_count = reader.read_u32();
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for (u32 i = 0; i < lexical_binding_count; ++i) {
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reader.skip_utf16();
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reader.skip(1);
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}
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auto declaration_function_count = reader.read_u32();
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VERIFY(declaration_function_count > 0);
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reader.skip_optional_utf16(); // Function name.
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return reader.offset();
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}
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TEST_CASE(bytecode_cache_materialization_failure_has_parser_error)
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{
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auto vm = JS::VM::create();
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auto root_execution_context = JS::create_simple_execution_context<JS::GlobalObject>(*vm);
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auto& realm = *root_execution_context->realm;
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auto test_data = create_bytecode_cache_blob("1;"sv);
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auto corrupted_blob = MUST(ByteBuffer::copy(test_data.blob.bytes()));
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// For this minimal script, the encoded top-level bytecode payload begins
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// after the cache header, empty declaration metadata, and executable
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// metadata. Corrupting the payload keeps the blob structurally decodable
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// while causing executable validation to reject it during materialization.
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constexpr size_t bytecode_payload_offset_for_empty_script = 112;
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VERIFY(corrupted_blob.size() > bytecode_payload_offset_for_empty_script);
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corrupted_blob[bytecode_payload_offset_for_empty_script] ^= 0xff;
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// Structural decode still succeeds because the blob is internally well-formed; the corruption is in the bytecode
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// payload, which is only checked by the validator that runs during materialization.
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auto* decoded_blob = JS::RustIntegration::decode_bytecode_cache_blob(corrupted_blob.bytes(), JS::RustIntegration::ProgramType::Script, test_data.source_hash.bytes());
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VERIFY(decoded_blob);
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auto materialized = JS::RustIntegration::materialize_bytecode_cache_script(decoded_blob, test_data.source_code, realm);
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EXPECT(materialized.has_value());
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EXPECT(materialized->is_error());
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EXPECT(!materialized->error().is_empty());
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EXPECT_EQ(materialized->error().first().message, "Failed to materialize bytecode cache"_string);
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}
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TEST_CASE(bytecode_cache_rejects_corrupt_declaration_function)
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{
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auto vm = JS::VM::create();
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auto root_execution_context = JS::create_simple_execution_context<JS::GlobalObject>(*vm);
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auto& realm = *root_execution_context->realm;
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auto test_data = create_bytecode_cache_blob("function f() { return 1; } f();"_string);
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auto corrupted_blob = MUST(ByteBuffer::copy(test_data.blob.bytes()));
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auto declaration_function_bytecode_offset = first_declaration_function_bytecode_payload_offset(corrupted_blob.bytes());
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VERIFY(declaration_function_bytecode_offset < corrupted_blob.size());
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corrupted_blob[declaration_function_bytecode_offset] ^= 0xff;
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// Structural decode still succeeds (the blob layout is intact); the corruption is in a function's bytecode payload
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// and is only caught when the materializer asks the validator to check it.
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auto* decoded_blob = JS::RustIntegration::decode_bytecode_cache_blob(corrupted_blob.bytes(), JS::RustIntegration::ProgramType::Script, test_data.source_hash.bytes());
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VERIFY(decoded_blob);
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auto materialized = JS::RustIntegration::materialize_bytecode_cache_script(decoded_blob, test_data.source_code, realm);
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EXPECT(materialized.has_value());
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EXPECT(materialized->is_error());
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EXPECT(!materialized->error().is_empty());
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EXPECT_EQ(materialized->error().first().message, "Failed to materialize bytecode cache"_string);
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}
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TEST_CASE(bytecode_cache_rejects_out_of_range_declaration_function_source_span)
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{
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auto vm = JS::VM::create();
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auto root_execution_context = JS::create_simple_execution_context<JS::GlobalObject>(*vm);
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auto& realm = *root_execution_context->realm;
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auto test_data = create_bytecode_cache_blob("function f() { return 1; } f();"_string);
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auto corrupted_blob = MUST(ByteBuffer::copy(test_data.blob.bytes()));
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auto source_text_start_offset = first_declaration_function_source_text_start_offset(corrupted_blob.bytes());
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write_u32(corrupted_blob, source_text_start_offset, test_data.source_code->length_in_code_units() + 1);
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// The source hash still matches and the blob layout is intact, but the cached function source span points outside
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// the current SourceCode. Materialization should reject it as a cache miss instead of handing the range to C++.
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auto* decoded_blob = JS::RustIntegration::decode_bytecode_cache_blob(corrupted_blob.bytes(), JS::RustIntegration::ProgramType::Script, test_data.source_hash.bytes());
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VERIFY(decoded_blob);
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auto materialized = JS::RustIntegration::materialize_bytecode_cache_script(decoded_blob, test_data.source_code, realm);
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EXPECT(materialized.has_value());
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EXPECT(materialized->is_error());
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EXPECT(!materialized->error().is_empty());
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EXPECT_EQ(materialized->error().first().message, "Failed to materialize bytecode cache"_string);
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}
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TEST_CASE(bytecode_cache_materializes_function_executables_lazily)
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{
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auto vm = JS::VM::create();
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auto root_execution_context = JS::create_simple_execution_context<JS::GlobalObject>(*vm);
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auto& realm = *root_execution_context->realm;
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auto test_data = create_bytecode_cache_blob("let f = function lazy() { return 1; }; f();"_string);
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auto* decoded_blob = JS::RustIntegration::decode_bytecode_cache_blob(test_data.blob.bytes(), JS::RustIntegration::ProgramType::Script, test_data.source_hash.bytes());
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VERIFY(decoded_blob);
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auto script_or_error = JS::Script::create_from_bytecode_cache(decoded_blob, test_data.source_code, realm);
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VERIFY(!script_or_error.is_error());
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auto script = script_or_error.release_value();
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auto* executable = script->cached_executable();
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VERIFY(executable);
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VERIFY(!executable->shared_function_data.is_empty());
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auto& shared_data = *executable->shared_function_data[0];
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EXPECT(!shared_data.m_executable);
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EXPECT(shared_data.m_cached_bytecode_executable);
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auto result = vm->run(script);
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VERIFY(!result.is_throw_completion());
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EXPECT(shared_data.m_executable);
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EXPECT(!shared_data.m_cached_bytecode_executable);
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}
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TEST_CASE(bytecode_cache_materializes_from_mapped_blob)
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{
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auto vm = JS::VM::create();
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auto root_execution_context = JS::create_simple_execution_context<JS::GlobalObject>(*vm);
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auto& realm = *root_execution_context->realm;
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auto test_data = create_bytecode_cache_blob("let f = function mapped() { return 1; }; f();"_string);
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auto path = ByteString::formatted("{}/bytecode-cache-test-{}.blob", Core::StandardPaths::tempfile_directory(), Core::System::getpid());
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ScopeGuard remove_file = [&] {
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(void)Core::System::unlink(path);
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};
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{
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auto file = TRY_OR_FAIL(Core::File::open(path, Core::File::OpenMode::Write | Core::File::OpenMode::Truncate));
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TRY_OR_FAIL(file->write_until_depleted(test_data.blob.bytes()));
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}
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auto file = TRY_OR_FAIL(Core::File::open(path, Core::File::OpenMode::Read));
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auto mapped_blob = TRY_OR_FAIL(Core::ImmutableBytes::map_from_fd_range_and_close(file->leak_fd(), path, 0, test_data.blob.size()));
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EXPECT(mapped_blob.is_file_backed());
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auto* decoded_blob = JS::RustIntegration::decode_bytecode_cache_blob(mapped_blob, JS::RustIntegration::ProgramType::Script, test_data.source_hash.bytes());
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VERIFY(decoded_blob);
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auto script_or_error = JS::Script::create_from_bytecode_cache(decoded_blob, test_data.source_code, realm);
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VERIFY(!script_or_error.is_error());
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auto result = vm->run(script_or_error.release_value());
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VERIFY(!result.is_throw_completion());
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}
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TEST_CASE(fresh_precompiled_function_executables_materialize_lazily)
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{
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auto vm = JS::VM::create();
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auto root_execution_context = JS::create_simple_execution_context<JS::GlobalObject>(*vm);
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auto& realm = *root_execution_context->realm;
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|
|
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auto source_code = JS::SourceCode::create("test.js"_string, Utf16String::from_utf8("let f = function lazy() { return 1; }; f();"_string));
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auto* parsed = JS::RustIntegration::parse_program(source_code->utf16_data(), source_code->length_in_code_units(), JS::RustIntegration::ProgramType::Script);
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VERIFY(parsed);
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ArmedScopeGuard free_parsed = [&] {
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JS::RustIntegration::free_parsed_program(parsed);
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};
|
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EXPECT(!JS::RustIntegration::parsed_program_has_errors(parsed));
|
|
|
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auto* compiled = JS::RustIntegration::compile_parsed_program_fully_off_thread(parsed, source_code->length_in_code_units());
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VERIFY(compiled);
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|
free_parsed.disarm();
|
|
|
|
auto script_or_error = JS::Script::create_from_compiled(compiled, source_code, realm);
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|
VERIFY(!script_or_error.is_error());
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|
auto script = script_or_error.release_value();
|
|
|
|
auto* executable = script->cached_executable();
|
|
VERIFY(executable);
|
|
VERIFY(!executable->shared_function_data.is_empty());
|
|
auto& shared_data = *executable->shared_function_data[0];
|
|
EXPECT(!shared_data.m_executable);
|
|
EXPECT(shared_data.m_precompiled_bytecode_executable);
|
|
|
|
auto result = vm->run(script);
|
|
VERIFY(!result.is_throw_completion());
|
|
EXPECT(shared_data.m_executable);
|
|
EXPECT(!shared_data.m_precompiled_bytecode_executable);
|
|
}
|
|
|
|
TEST_CASE(bytecode_cache_preserves_re_exported_import_names)
|
|
{
|
|
auto vm = JS::VM::create();
|
|
auto root_execution_context = JS::create_simple_execution_context<JS::GlobalObject>(*vm);
|
|
auto& realm = *root_execution_context->realm;
|
|
|
|
auto test_data = create_module_bytecode_cache_blob("import { pass as renamed } from './source.mjs'; export { renamed as default };"sv);
|
|
|
|
auto* decoded_blob = JS::RustIntegration::decode_bytecode_cache_blob(test_data.blob.bytes(), JS::RustIntegration::ProgramType::Module, test_data.source_hash.bytes());
|
|
VERIFY(decoded_blob);
|
|
|
|
auto source_module = JS::SourceTextModule::parse("export function pass() {}"sv, realm, "./source.mjs"sv).release_value();
|
|
source_module->set_status(JS::ModuleStatus::Unlinked);
|
|
|
|
auto cached_module = JS::SourceTextModule::parse_from_bytecode_cache(decoded_blob, test_data.source_code, realm).release_value();
|
|
cached_module->set_status(JS::ModuleStatus::Unlinked);
|
|
cached_module->loaded_modules().append(JS::LoadedModuleRequest {
|
|
.specifier = Utf16String::from_utf8("./source.mjs"sv),
|
|
.attributes = {},
|
|
.module = source_module,
|
|
});
|
|
|
|
auto resolution = cached_module->resolve_export(*vm, "default"_utf16_fly_string);
|
|
EXPECT(resolution.is_valid());
|
|
EXPECT_EQ(resolution.module.ptr(), source_module.ptr());
|
|
EXPECT_EQ(resolution.export_name, "pass"sv);
|
|
}
|