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Merge pull request #14269 from blishko/smtchecker-fix-analysis-external-calls

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[SMTChecker] Remember verification targets from trusted external calls
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Leo 2023-05-30 13:45:37 +02:00 committed by GitHub
commit ceab4dfee5
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4 changed files with 31 additions and 5 deletions
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2
Changelog.md
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@ -15,7 +15,7 @@ Compiler Features:
Bugfixes:
* Commandline Interface: It is no longer possible to specify both ``--optimize-yul`` and ``--no-optimize-yul`` at the same time.
* SMTChecker: Fix encoding of side-effects inside ``if`` and ``ternary conditional``statements in the BMC engine.
* SMTChecker: Fix false negative when a verification target can be violated only by trusted external call from another public function.
AST Changes:
* AST: Add the ``experimentalSolidity`` field to the ``SourceUnit`` nodes, which indicate whether the experimental parsing mode has been enabled via ``pragma experimental solidity``.

6
libsolidity/formal/CHC.cpp
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@ -1000,6 +1000,12 @@ void CHC::externalFunctionCallToTrustedCode(FunctionCall const& _funCall)
if (!function)
return;
// Remember the external call in the call graph to properly detect verification targets for the current function
if (m_currentFunction && !m_currentFunction->isConstructor())
m_callGraph[m_currentFunction].insert(function);
else
m_callGraph[m_currentContract].insert(function);
// External call creates a new transaction.
auto originalTx = state().tx();
Expression const* value = valueOption(callOptions);

5
test/libsolidity/smtCheckerTests/deployment/deploy_trusted_flow.sol
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@ -21,11 +21,8 @@ contract C {
// SMTIgnoreOS: macos
// ----
// Warning 4984: (47-50): CHC: Overflow (resulting value larger than 2**256 - 1) might happen here.
// Warning 6328: (167-185): CHC: Assertion violation might happen here.
// Warning 6328: (215-233): CHC: Assertion violation might happen here.
// Warning 6328: (267-285): CHC: Assertion violation might happen here.
// Warning 6328: (304-322): CHC: Assertion violation happens here.
// Info 1391: CHC: 2 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.
// Warning 2661: (47-50): BMC: Overflow (resulting value larger than 2**256 - 1) happens here.
// Warning 4661: (167-185): BMC: Assertion violation happens here.
// Warning 4661: (215-233): BMC: Assertion violation happens here.
// Warning 4661: (267-285): BMC: Assertion violation happens here.

23
test/libsolidity/smtCheckerTests/external_calls/underflow_only_in_external_call.sol Normal file
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@ -0,0 +1,23 @@
contract C {
uint v;
bool guard = true;
function dec() public returns (uint) {
if (guard) return 0;
--v;
return v;
}
function f() public returns (uint) {
guard = false;
uint ret = this.dec();
guard = true;
return ret;
}
}
// ====
// SMTEngine: chc
// SMTTargets: underflow
// ----
// Warning 3944: (109-112): CHC: Underflow (resulting value less than 0) happens here.