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LibWasm: Do not allow self-referencial globals

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This is written in a somewhat roundabout way in the spec, so the
initial implementation did not implement it correctly.
This commit is contained in:
Ali Mohammad Pur 2023-07-03 12:25:18 +03:30 • committed by Ali Mohammad Pur
parent 4f0f1c7c72
commit 8668851cb1
2 changed files with 15 additions and 1 deletions
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15
Userland/Libraries/LibWasm/AbstractMachine/Validator.cpp
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@ -7,6 +7,7 @@
#include <AK/HashTable.h>
#include <AK/Result.h>
#include <AK/SourceLocation.h>
#include <AK/TemporaryChange.h>
#include <AK/Try.h>
#include <LibWasm/AbstractMachine/Validator.h>
#include <LibWasm/Printer/Printer.h>
@ -56,7 +57,10 @@ ErrorOr<void, ValidationError> Validator::validate(Module& module)
},
[this](TableType const& type) { m_context.tables.append(type); },
[this](MemoryType const& type) { m_context.memories.append(type); },
[this](GlobalType const& type) { m_context.globals.append(type); });
[this](GlobalType const& type) {
m_globals_without_internal_globals.append(type);
m_context.globals.append(type);
});
}
});
@ -93,6 +97,7 @@ ErrorOr<void, ValidationError> Validator::validate(Module& module)
for (auto& memory : section.memories())
m_context.memories.unchecked_append(memory.type());
});
module.for_each_section_of_type<GlobalSection>([this](GlobalSection const& section) {
m_context.globals.ensure_capacity(m_context.globals.size() + section.entries().size());
for (auto& global : section.entries())
@ -213,12 +218,20 @@ ErrorOr<void, ValidationError> Validator::validate(ElementSection const& section
return Errors::invalid("active element initializer type"sv, ValueType(ValueType::I32), expression_result.result_types);
return {};
}));
for (auto& expression : segment.init) {
auto result = TRY(validate(expression, { segment.type }));
if (!result.is_constant)
return Errors::invalid("element initializer"sv);
}
}
return {};
}
ErrorOr<void, ValidationError> Validator::validate(GlobalSection const& section)
{
TemporaryChange omit_internal_globals { m_context.globals, m_globals_without_internal_globals };
for (auto& entry : section.entries()) {
auto& type = entry.type();
TRY(validate(type));