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blockchain: keep block template timestamp not below recent median

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Such a template would yield an invalid block, though would require
an attacker to have mined a long blockchain with drifting times
(assuming the miner's clock is roughly correct)

Fixed by crCr62U0
This commit is contained in:
moneromooo-monero 2019-09-10 13:36:09 +00:00
parent d0d76f771a
commit b9da0234e9
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GPG Key ID: 686F07454D6CEFC3
1 changed files with 3 additions and 1 deletions
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4
src/cryptonote_core/blockchain.cpp
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@ -1385,7 +1385,9 @@ bool Blockchain::create_block_template(block& b, const crypto::hash *from_block,
if (!memcmp(&miner_address, &m_btc_address, sizeof(cryptonote::account_public_address)) && m_btc_nonce == ex_nonce if (!memcmp(&miner_address, &m_btc_address, sizeof(cryptonote::account_public_address)) && m_btc_nonce == ex_nonce
&& m_btc_pool_cookie == m_tx_pool.cookie() && m_btc.prev_id == get_tail_id()) { && m_btc_pool_cookie == m_tx_pool.cookie() && m_btc.prev_id == get_tail_id()) {
MDEBUG("Using cached template"); MDEBUG("Using cached template");
m_btc.timestamp = time(NULL); // update timestamp unconditionally const uint64_t now = time(NULL);
if (m_btc.timestamp < now) // ensures it can't get below the median of the last few blocks
m_btc.timestamp = now;
b = m_btc; b = m_btc;
diffic = m_btc_difficulty; diffic = m_btc_difficulty;
height = m_btc_height; height = m_btc_height;