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Merge pull request #11899 from ethereum/move-check-keccak-gas

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Resolving Keccak-256: check if arguments are identifiers early.
This commit is contained in:
Harikrishnan Mulackal 2021-09-06 14:28:42 +02:00 committed by GitHub
commit e9b70b168a
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3 changed files with 21 additions and 7 deletions
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1
Changelog.md
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@ -12,6 +12,7 @@ Compiler Features:
* SMTChecker: Add constraints to better correlate ``address(this).balance`` and ``msg.value``.
* SMTChecker: Support the ``value`` option for external function calls.
* Commandline Interface: Disallowed the ``--experimental-via-ir`` option to be used with Standard Json, Assembler and Linker modes.
* Yul Optimizer: Fix a crash in LoadResolver, when ``keccak256`` has particular non-identifier arguments.
Bugfixes:

14
libyul/optimiser/LoadResolver.cpp
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@ -97,6 +97,13 @@ void LoadResolver::tryEvaluateKeccak(
std::vector<Expression> const& _arguments
)
{
yulAssert(_arguments.size() == 2, "");
Identifier const* memoryKey = std::get_if<Identifier>(&_arguments.at(0));
Identifier const* length = std::get_if<Identifier>(&_arguments.at(1));
if (!memoryKey || !length)
return;
// The costs are only correct for hashes of 32 bytes or 1 word (when rounded up).
GasMeter gasMeter{
dynamic_cast<EVMDialect const&>(m_dialect),
@ -122,13 +129,6 @@ void LoadResolver::tryEvaluateKeccak(
if (costOfLiteral > costOfKeccak)
return;
yulAssert(_arguments.size() == 2, "");
Identifier const* memoryKey = std::get_if<Identifier>(&_arguments.at(0));
Identifier const* length = std::get_if<Identifier>(&_arguments.at(1));
if (!memoryKey || !length)
return;
auto memoryValue = util::valueOrNullptr(m_memory, memoryKey->name);
if (memoryValue && inScope(*memoryValue))
{

13
test/libyul/yulOptimizerTests/loadResolver/keccak_crash.yul Normal file
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@ -0,0 +1,13 @@
// This test used to crash: https://github.com/ethereum/solidity/issues/11801
{
for {} addmod(keccak256(0x0,create(0x0, 0x0, 0x0)), 0x0, 0x0) {} {}
}
// ----
// step: loadResolver
//
// {
// for { }
// addmod(keccak256(0x0, create(0x0, 0x0, 0x0)), 0x0, 0x0)
// { }
// { }
// }