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LibWasm: Fix data section initialization bounds checking

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Ali Mohammad Pur 2021-07-06 14:03:38 +04:30 • committed by Ali Mohammad Pur
parent d2212a1f51
commit 03fe50d5e7
1 changed files with 12 additions and 4 deletions
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16
Userland/Libraries/LibWasm/AbstractMachine/AbstractMachine.cpp
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@ -280,14 +280,22 @@ InstantiationResult AbstractMachine::instantiate(Module const& module, Vector<Ex
if (instantiation_result.has_value() && instantiation_result->is_error()) if (instantiation_result.has_value() && instantiation_result->is_error())
return; return;
if (main_module_instance.memories().size() <= data.index.value()) { if (main_module_instance.memories().size() <= data.index.value()) {
instantiation_result = InstantiationError { String::formatted("Data segment referenced out-of-bounds memory ({}) of max {} entries", data.index.value(), main_module_instance.memories().size()) }; instantiation_result = InstantiationError {
String::formatted("Data segment referenced out-of-bounds memory ({}) of max {} entries",
data.index.value(), main_module_instance.memories().size())
};
return; return;
} }
auto address = main_module_instance.memories()[data.index.value()]; auto address = main_module_instance.memories()[data.index.value()];
if (auto instance = m_store.get(address)) { if (auto instance = m_store.get(address)) {
if (instance->type().limits().max().value_or(data.init.size() + offset + 1) <= data.init.size() + offset) { if (auto max = instance->type().limits().max(); max.has_value()) {
instantiation_result = InstantiationError { String::formatted("Data segment attempted to write to out-of-bounds memory ({}) of max {} bytes", data.init.size() + offset, instance->type().limits().max().value()) }; if (*max < data.init.size() + offset) {
return; instantiation_result = InstantiationError {
String::formatted("Data segment attempted to write to out-of-bounds memory ({}) of max {} bytes",
data.init.size() + offset, instance->type().limits().max().value())
};
return;
}
} }
if (instance->size() < data.init.size() + offset) if (instance->size() < data.init.size() + offset)
instance->grow(data.init.size() + offset - instance->size()); instance->grow(data.init.size() + offset - instance->size());