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LibWeb: Prevent variadic arguments from reserving heaps of memory

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Don't try to reserve capacity for a variadic arguments list unless we
actually have enough arguments to fill it with anything. Otherwise we
may overflow to an extremely large size if, e.g., the argument count
is 0 and the start of the variadic arguments is index 1.
This commit is contained in:
Timothy Flynn 2023-03-14 12:16:33 -04:00 • committed by Linus Groh
parent 3e970540b4
commit e6dc3c291e
1 changed files with 27 additions and 15 deletions
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42
Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp
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@ -265,11 +265,14 @@ static void generate_to_deprecated_string(SourceGenerator& scoped_generator, Par
if (variadic) {
scoped_generator.append(R"~~~(
Vector<DeprecatedString> @cpp_name@;
@cpp_name@.ensure_capacity(vm.argument_count() - @js_suffix@);
for (size_t i = @js_suffix@; i < vm.argument_count(); ++i) {
auto to_string_result = TRY(vm.argument(i).to_deprecated_string(vm));
@cpp_name@.append(move(to_string_result));
if (vm.argument_count() > @js_suffix@) {
TRY_OR_THROW_OOM(vm, @cpp_name@.try_ensure_capacity(vm.argument_count() - @js_suffix@));
for (size_t i = @js_suffix@; i < vm.argument_count(); ++i) {
auto to_string_result = TRY(vm.argument(i).to_deprecated_string(vm));
@cpp_name@.unchecked_append(move(to_string_result));
}
}
)~~~");
} else if (!optional) {
@ -316,11 +319,14 @@ static void generate_to_new_string(SourceGenerator& scoped_generator, ParameterT
if (variadic) {
scoped_generator.append(R"~~~(
Vector<String> @cpp_name@;
@cpp_name@.ensure_capacity(vm.argument_count() - @js_suffix@);
for (size_t i = @js_suffix@; i < vm.argument_count(); ++i) {
auto to_string_result = TRY(vm.argument(i).to_string(vm));
@cpp_name@.append(move(to_string_result));
if (vm.argument_count() > @js_suffix@) {
TRY_OR_THROW_OOM(vm, @cpp_name@.try_ensure_capacity(vm.argument_count() - @js_suffix@));
for (size_t i = @js_suffix@; i < vm.argument_count(); ++i) {
auto to_string_result = TRY(vm.argument(i).to_string(vm));
@cpp_name@.unchecked_append(move(to_string_result));
}
}
)~~~");
} else if (!optional) {
@ -614,10 +620,13 @@ static void generate_to_cpp(SourceGenerator& generator, ParameterType& parameter
if (variadic) {
scoped_generator.append(R"~~~(
JS::MarkedVector<JS::Value> @cpp_name@ { vm.heap() };
TRY_OR_THROW_OOM(vm, @cpp_name@.try_ensure_capacity(vm.argument_count() - @js_suffix@));
for (size_t i = @js_suffix@; i < vm.argument_count(); ++i)
@cpp_name@.unchecked_append(vm.argument(i));
if (vm.argument_count() > @js_suffix@) {
TRY_OR_THROW_OOM(vm, @cpp_name@.try_ensure_capacity(vm.argument_count() - @js_suffix@));
for (size_t i = @js_suffix@; i < vm.argument_count(); ++i)
@cpp_name@.unchecked_append(vm.argument(i));
}
)~~~");
} else if (!optional) {
scoped_generator.append(R"~~~(
@ -1370,11 +1379,14 @@ static void generate_to_cpp(SourceGenerator& generator, ParameterType& parameter
} else {
union_generator.append(R"~~~(
Vector<@union_type@> @cpp_name@;
@cpp_name@.ensure_capacity(vm.argument_count() - @js_suffix@);
for (size_t i = @js_suffix@; i < vm.argument_count(); ++i) {
auto result = TRY(@js_name@@js_suffix@_to_variant(vm.argument(i)));
@cpp_name@.append(move(result));
if (vm.argument_count() > @js_suffix@) {
TRY_OR_THROW_OOM(vm, @cpp_name@.try_ensure_capacity(vm.argument_count() - @js_suffix@));
for (size_t i = @js_suffix@; i < vm.argument_count(); ++i) {
auto result = TRY(@js_name@@js_suffix@_to_variant(vm.argument(i)));
@cpp_name@.unchecked_append(move(result));
}
}
)~~~");
}