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core: bound the amount of entries in bad tx semantics cache

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This is to prevent unbounded memory use. Since I don't think there
is a container that has quick insert, quick lookup, and automatic
FIFO, I use two and swap every N, clearing the oldest one.
This commit is contained in:
moneromooo-monero 2017-02-23 20:15:52 +00:00
parent 240054a7f8
commit 9effa55311
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GPG key ID: 686F07454D6CEFC3
2 changed files with 16 additions and 6 deletions
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14
src/cryptonote_core/cryptonote_core.cpp
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@ -60,6 +60,8 @@ DISABLE_VS_WARNINGS(4355)
#define MERROR_VER(x) MCERROR("verify", x)
#define BAD_SEMANTICS_TXES_MAX_SIZE 100
namespace cryptonote
{
@ -496,12 +498,15 @@ namespace cryptonote
}
//std::cout << "!"<< tx.vin.size() << std::endl;
if (bad_semantics_txes.find(tx_hash) != bad_semantics_txes.end())
for (int idx = 0; idx < 2; ++idx)
{
if (bad_semantics_txes[idx].find(tx_hash) != bad_semantics_txes[idx].end())
{
LOG_PRINT_L1("Transaction already seen with bad semantics, rejected");
tvc.m_verifivation_failed = true;
return false;
}
}
uint8_t version = m_blockchain_storage.get_current_hard_fork_version();
const size_t max_tx_version = version == 1 ? 1 : 2;
@ -551,8 +556,13 @@ namespace cryptonote
if(!check_tx_semantic(tx, keeped_by_block))
{
LOG_PRINT_L1("WRONG TRANSACTION BLOB, Failed to check tx " << tx_hash << " semantic, rejected");
bad_semantics_txes.insert(tx_hash);
tvc.m_verifivation_failed = true;
bad_semantics_txes[0].insert(tx_hash);
if (bad_semantics_txes[0].size() >= BAD_SEMANTICS_TXES_MAX_SIZE)
{
std::swap(bad_semantics_txes[0], bad_semantics_txes[1]);
bad_semantics_txes[0].clear();
}
return false;
}

2
src/cryptonote_core/cryptonote_core.h
View file

@ -836,7 +836,7 @@ namespace cryptonote
time_t start_time;
std::unordered_set<crypto::hash> bad_semantics_txes;
std::unordered_set<crypto::hash> bad_semantics_txes[2];
enum {
UPDATES_DISABLED,