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VM memory hashing support for differential fuzzing #358

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VM memory hashing support for differential fuzzing #358

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cb9462b
Add memory log support
hrvoje-osec Aug 29, 2025
2607497
Fix memory log function names
hrvoje-osec Aug 29, 2025
4231cd5
Remove unused import
hrvoje-osec Aug 29, 2025
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23 changes: 23 additions & 0 deletions src/txn_fuzzer.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ use solana_account::{AccountSharedData, ReadableAccount};
use solana_accounts_db::accounts_db::AccountsDbConfig;
use solana_accounts_db::accounts_file::StorageAccess;
use solana_accounts_db::accounts_index::{AccountsIndexConfig, IndexLimitMb};
use solana_bpf_loader_program;
use solana_clock::MAX_PROCESSING_AGE;
use solana_epoch_schedule::EpochSchedule;
use solana_genesis_config::GenesisConfig;
Expand Down Expand Up @@ -540,6 +541,21 @@ pub fn execute_transaction(context: &TxnContext) -> Option<TxnResult> {
.map(|message| message.account_keys.clone())
.unwrap_or_default();

let memory_log = solana_bpf_loader_program::sol_compat_get_memory_log();
solana_bpf_loader_program::sol_compat_reset_memory_log();
let memory_log_account = AcctState {
address: [0x41; 32].to_vec(),
lamports: 0,
data: memory_log
.into_iter()
.flat_map(|x| x.to_le_bytes().to_vec())
.collect(),
executable: false,
rent_epoch: u64::MAX,
owner: [0x41; 32].to_vec(),
seed_addr: None,
};

let mut txn_result = output_txn_result_from_result(result, sanitized_transaction.message());
if let Some(relevant_accounts) = &mut txn_result.resulting_state {
let mut loaded_account_keys = AHashSet::<Pubkey>::new();
Expand Down Expand Up @@ -570,8 +586,15 @@ pub fn execute_transaction(context: &TxnContext) -> Option<TxnResult> {
let pubkey = Pubkey::new_from_array(account.address.clone().try_into().unwrap());
loaded_account_keys.contains(&pubkey)
});
relevant_accounts.acct_states.push(memory_log_account);

txn_result.resulting_state = Some(relevant_accounts.clone());
} else {
txn_result.resulting_state = Some(ResultingState {
acct_states: vec![memory_log_account],
rent_debits: vec![],
transaction_rent: 0,
});
}

Some(txn_result)
Expand Down