feat(corpus): add sender and value mutation in corpus fuzzing#12934
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mattvaux wants to merge 6 commits intofoundry-rs:masterfrom
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feat(corpus): add sender and value mutation in corpus fuzzing#12934mattvaux wants to merge 6 commits intofoundry-rs:masterfrom
mattvaux wants to merge 6 commits intofoundry-rs:masterfrom
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mattvaux
requested review from
0xrusowsky,
DaniPopes,
grandizzy,
mattsse,
onbjerg and
zerosnacks
as code owners
0xalpharush
reviewed
Dec 26, 2025
Comment on lines
+635
to
+646
| // Mutate value with 15% probability | ||
| if test_runner.rng().random_ratio(15, 100) { | ||
| // Generate random value, biased towards smaller values for practical fuzzing | ||
| let value = match test_runner.rng().random_range(0..=10) { | ||
| 0..=5 => U256::from(test_runner.rng().random_range(0..=1000)), // Small values | ||
| 6..=8 => U256::from(test_runner.rng().random_range(0..=1_000_000_000_000_000u64)), // Medium values (up to 0.001 ETH) | ||
| 9 => U256::from(test_runner.rng().random_range(0..=1_000_000_000_000_000_000u64)), // Large values (up to 1 ETH) | ||
| 10 => U256::MAX, // Edge case | ||
| _ => unreachable!(), | ||
| }; | ||
| tx.call_details.value = Some(value); | ||
| } |
Contributor
0xalpharush
reviewed
Dec 26, 2025
| tx.call_details.calldata = | ||
| function.abi_encode_input(&prev_inputs).map_err(|e| eyre!(e.to_string()))?.into(); | ||
|
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| // Mutate sender with 15% probability |
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Fixes TODO: mutate sender and value in corpus fuzzing.
Only calldata was being mutated, so we missed bugs in contracts that depend on msg.sender or msg.value. Added mutation for both fields with 15% probability each.
Added value field to CallDetails with serde default for backward compatibility.