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safe math

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This commit is contained in:
Hardhat Chad
2024-07-02 17:03:40 +00:00
parent 2cbcaab23c
commit 3e9150503c
2 changed files with 23 additions and 24 deletions
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45
program/src/mine.rs
View File

@@ -99,28 +99,26 @@ pub fn process_mine<'a, 'info>(
let difficulty = difficulty.saturating_sub(MIN_DIFFICULTY);
let mut reward = config
.base_reward_rate
.saturating_mul(2u64.saturating_pow(difficulty));
.checked_mul(2u64.checked_pow(difficulty).unwrap())
.unwrap();
// Apply staking multiplier.
// If user has greater than or equal to the max stake on the network, they receive 2x multiplier.
// Any stake less than this will receives between 1x and 2x multipler. The multipler is only active
// if the miner's last stake deposit was more than one minute ago.
if config.max_stake.gt(&0)
&& proof
.last_stake_at
.saturating_add(ONE_MINUTE)
.le(&clock.unix_timestamp)
{
let t = clock.unix_timestamp;
if config.max_stake.gt(&0) && proof.last_stake_at.saturating_add(ONE_MINUTE).le(&t) {
let staking_reward = proof
.balance
.min(config.max_stake)
.saturating_mul(reward)
.saturating_div(config.max_stake);
reward = reward.saturating_add(staking_reward);
.checked_mul(reward)
.unwrap()
.checked_div(config.max_stake)
.unwrap();
reward = reward.checked_add(staking_reward).unwrap();
}
// Reject spam transactions.
let t = clock.unix_timestamp;
let t_target = proof.last_hash_at.saturating_add(ONE_MINUTE);
let t_spam = t_target.saturating_sub(TOLERANCE);
if t.lt(&t_spam) {
@@ -130,11 +128,15 @@ pub fn process_mine<'a, 'info>(
// Apply liveness penalty.
let t_liveness = t_target.saturating_add(TOLERANCE);
if t.gt(&t_liveness) {
reward = reward.saturating_sub(
reward
.saturating_mul(t.saturating_sub(t_liveness) as u64)
.saturating_div(ONE_MINUTE as u64),
);
reward = reward
.checked_sub(
reward
.checked_mul(t.checked_sub(t_liveness).unwrap() as u64)
.unwrap()
.checked_div(ONE_MINUTE as u64)
.unwrap(),
)
.unwrap();
}
// Limit payout amount to whatever is left in the bus
@@ -143,9 +145,9 @@ pub fn process_mine<'a, 'info>(
let reward_actual = reward.min(bus.rewards);
// Update balances
bus.theoretical_rewards = bus.theoretical_rewards.saturating_add(reward);
bus.rewards = bus.rewards.saturating_sub(reward_actual);
proof.balance = proof.balance.saturating_add(reward_actual);
bus.theoretical_rewards = bus.theoretical_rewards.checked_add(reward).unwrap();
bus.rewards = bus.rewards.checked_sub(reward_actual).unwrap();
proof.balance = proof.balance.checked_add(reward_actual).unwrap();
// Hash recent slot hash into the next challenge to prevent pre-mining attacks
proof.last_hash = hash.h;
@@ -156,10 +158,7 @@ pub fn process_mine<'a, 'info>(
.0;
// Update time trackers
proof.last_hash_at = proof
.last_hash_at
.saturating_add(ONE_MINUTE)
.max(clock.unix_timestamp);
proof.last_hash_at = t.max(t_target);
// Update lifetime stats
proof.total_hashes = proof.total_hashes.saturating_add(1);

2
program/src/stake.rs
View File

@@ -36,7 +36,7 @@ pub fn process_stake<'a, 'info>(
// Update proof balance
let mut proof_data = proof_info.data.borrow_mut();
let proof = Proof::try_from_bytes_mut(&mut proof_data)?;
proof.balance = proof.balance.saturating_add(amount);
proof.balance = proof.balance.checked_add(amount).unwrap();
// Update deposit timestamp
let clock = Clock::get().or(Err(ProgramError::InvalidAccountData))?;