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core: from v12, require consistent ring size for mixable txes

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We're supposed to have a fixed ring size now

Already checked by MLSAG verification, but here seems more intuitive
This commit is contained in:
moneromooo-monero 2019-04-13 23:37:55 +00:00
parent 26072f1393
commit 555dc7c394
No known key found for this signature in database
GPG Key ID: 686F07454D6CEFC3
2 changed files with 24 additions and 8 deletions
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1
src/cryptonote_config.h
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@ -151,6 +151,7 @@
#define HF_VERSION_LONG_TERM_BLOCK_WEIGHT 10 #define HF_VERSION_LONG_TERM_BLOCK_WEIGHT 10
#define HF_VERSION_MIN_2_OUTPUTS 12 #define HF_VERSION_MIN_2_OUTPUTS 12
#define HF_VERSION_MIN_V2_COINBASE_TX 12 #define HF_VERSION_MIN_V2_COINBASE_TX 12
#define HF_VERSION_SAME_MIXIN 12
#define PER_KB_FEE_QUANTIZATION_DECIMALS 8 #define PER_KB_FEE_QUANTIZATION_DECIMALS 8

31
src/cryptonote_core/blockchain.cpp
View File

@ -2860,7 +2860,8 @@ bool Blockchain::check_tx_inputs(transaction& tx, tx_verification_context &tvc,
if (hf_version >= 2) if (hf_version >= 2)
{ {
size_t n_unmixable = 0, n_mixable = 0; size_t n_unmixable = 0, n_mixable = 0;
size_t mixin = std::numeric_limits<size_t>::max(); size_t min_actual_mixin = std::numeric_limits<size_t>::max();
size_t max_actual_mixin = 0;
const size_t min_mixin = hf_version >= HF_VERSION_MIN_MIXIN_10 ? 10 : hf_version >= HF_VERSION_MIN_MIXIN_6 ? 6 : hf_version >= HF_VERSION_MIN_MIXIN_4 ? 4 : 2; const size_t min_mixin = hf_version >= HF_VERSION_MIN_MIXIN_10 ? 10 : hf_version >= HF_VERSION_MIN_MIXIN_6 ? 6 : hf_version >= HF_VERSION_MIN_MIXIN_4 ? 4 : 2;
for (const auto& txin : tx.vin) for (const auto& txin : tx.vin)
{ {
@ -2885,29 +2886,43 @@ bool Blockchain::check_tx_inputs(transaction& tx, tx_verification_context &tvc,
else else
++n_mixable; ++n_mixable;
} }
if (in_to_key.key_offsets.size() - 1 < mixin) size_t ring_mixin = in_to_key.key_offsets.size() - 1;
mixin = in_to_key.key_offsets.size() - 1; if (ring_mixin < min_actual_mixin)
min_actual_mixin = ring_mixin;
if (ring_mixin > max_actual_mixin)
max_actual_mixin = ring_mixin;
}
}
MDEBUG("Mixin: " << min_actual_mixin << "-" << max_actual_mixin);
if (hf_version >= HF_VERSION_SAME_MIXIN)
{
if (min_actual_mixin != max_actual_mixin)
{
MERROR_VER("Tx " << get_transaction_hash(tx) << " has varying ring size (" << (min_actual_mixin + 1) << "-" << (max_actual_mixin + 1) << "), it should be constant");
tvc.m_low_mixin = true;
return false;
} }
} }
if (((hf_version == HF_VERSION_MIN_MIXIN_10 || hf_version == HF_VERSION_MIN_MIXIN_10+1) && mixin != 10) || (hf_version >= HF_VERSION_MIN_MIXIN_10+2 && mixin > 10)) if (((hf_version == HF_VERSION_MIN_MIXIN_10 || hf_version == HF_VERSION_MIN_MIXIN_10+1) && min_actual_mixin != 10) || (hf_version >= HF_VERSION_MIN_MIXIN_10+2 && min_actual_mixin > 10))
{ {
MERROR_VER("Tx " << get_transaction_hash(tx) << " has invalid ring size (" << (mixin + 1) << "), it should be 11"); MERROR_VER("Tx " << get_transaction_hash(tx) << " has invalid ring size (" << (min_actual_mixin + 1) << "), it should be 11");
tvc.m_low_mixin = true; tvc.m_low_mixin = true;
return false; return false;
} }
if (mixin < min_mixin) if (min_actual_mixin < min_mixin)
{ {
if (n_unmixable == 0) if (n_unmixable == 0)
{ {
MERROR_VER("Tx " << get_transaction_hash(tx) << " has too low ring size (" << (mixin + 1) << "), and no unmixable inputs"); MERROR_VER("Tx " << get_transaction_hash(tx) << " has too low ring size (" << (min_actual_mixin + 1) << "), and no unmixable inputs");
tvc.m_low_mixin = true; tvc.m_low_mixin = true;
return false; return false;
} }
if (n_mixable > 1) if (n_mixable > 1)
{ {
MERROR_VER("Tx " << get_transaction_hash(tx) << " has too low ring size (" << (mixin + 1) << "), and more than one mixable input with unmixable inputs"); MERROR_VER("Tx " << get_transaction_hash(tx) << " has too low ring size (" << (min_actual_mixin + 1) << "), and more than one mixable input with unmixable inputs");
tvc.m_low_mixin = true; tvc.m_low_mixin = true;
return false; return false;
} }