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Always reject duplicate key-images from second txid

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This commit is contained in:
Lee Clagett 2020-03-26 12:24:45 +00:00
parent babf25d2ec
commit 571546067f
3 changed files with 55 additions and 25 deletions
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22
src/cryptonote_core/tx_pool.cpp
View file

@ -210,7 +210,7 @@ namespace cryptonote
// TODO: Investigate why not?
if(!kept_by_block)
{
if(have_tx_keyimges_as_spent(tx))
if(have_tx_keyimges_as_spent(tx, id))
{
mark_double_spend(tx);
LOG_PRINT_L1("Transaction with id= "<< id << " used already spent key images");
@ -253,7 +253,7 @@ namespace cryptonote
meta.last_relayed_time = time(NULL);
meta.relayed = relayed;
meta.set_relay_method(tx_relay);
meta.double_spend_seen = have_tx_keyimges_as_spent(tx);
meta.double_spend_seen = have_tx_keyimges_as_spent(tx, id);
meta.pruned = tx.pruned;
meta.bf_padding = 0;
memset(meta.padding, 0, sizeof(meta.padding));
@ -1098,30 +1098,32 @@ namespace cryptonote
return m_blockchain.get_db().txpool_has_tx(id, tx_category);
}
//---------------------------------------------------------------------------------
bool tx_memory_pool::have_tx_keyimges_as_spent(const transaction& tx) const
bool tx_memory_pool::have_tx_keyimges_as_spent(const transaction& tx, const crypto::hash& txid) const
{
CRITICAL_REGION_LOCAL(m_transactions_lock);
CRITICAL_REGION_LOCAL1(m_blockchain);
for(const auto& in: tx.vin)
{
CHECKED_GET_SPECIFIC_VARIANT(in, const txin_to_key, tokey_in, true);//should never fail
if(have_tx_keyimg_as_spent(tokey_in.k_image))
if(have_tx_keyimg_as_spent(tokey_in.k_image, txid))
return true;
}
return false;
}
//---------------------------------------------------------------------------------
bool tx_memory_pool::have_tx_keyimg_as_spent(const crypto::key_image& key_im) const
bool tx_memory_pool::have_tx_keyimg_as_spent(const crypto::key_image& key_im, const crypto::hash& txid) const
{
CRITICAL_REGION_LOCAL(m_transactions_lock);
bool spent = false;
const auto found = m_spent_key_images.find(key_im);
if (found != m_spent_key_images.end())
if (found != m_spent_key_images.end() && !found->second.empty())
{
for (const crypto::hash& tx_hash : found->second)
spent |= m_blockchain.txpool_tx_matches_category(tx_hash, relay_category::broadcasted);
// If another tx is using the key image, always return as spent.
// See `insert_key_images`.
if (1 < found->second.size() || *(found->second.cbegin()) != txid)
return true;
return m_blockchain.txpool_tx_matches_category(txid, relay_category::broadcasted);
}
return spent;
return false;
}
//---------------------------------------------------------------------------------
void tx_memory_pool::lock() const

6
src/cryptonote_core/tx_pool.h
View file

@ -470,10 +470,11 @@ namespace cryptonote
* @brief check if a transaction in the pool has a given spent key image
*
* @param key_im the spent key image to look for
* @param txid hash of the new transaction where `key_im` was seen.
*
* @return true if the spent key image is present, otherwise false
*/
bool have_tx_keyimg_as_spent(const crypto::key_image& key_im) const;
bool have_tx_keyimg_as_spent(const crypto::key_image& key_im, const crypto::hash& txid) const;
/**
* @brief check if any spent key image in a transaction is in the pool
@ -484,10 +485,11 @@ namespace cryptonote
* @note see tx_pool::have_tx_keyimg_as_spent
*
* @param tx the transaction to check spent key images of
* @param txid hash of `tx`.
*
* @return true if any spent key images are present in the pool, otherwise false
*/
bool have_tx_keyimges_as_spent(const transaction& tx) const;
bool have_tx_keyimges_as_spent(const transaction& tx, const crypto::hash& txid) const;
/**
* @brief forget a transaction's spent key images