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Merge pull request #5123

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089c7637 cryptonote: rework block blob size sanity check (moneromooo-monero)
This commit is contained in:
Riccardo Spagni
2019-04-11 12:41:07 +02:00
parent 7d3cb10838 089c7637a6
commit 76fbcfe2dd
10 changed files with 100 additions and 16 deletions
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src/cryptonote_core/cryptonote_core.cpp
+18 -8
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@@ -62,6 +62,9 @@ DISABLE_VS_WARNINGS(4355)
#define BAD_SEMANTICS_TXES_MAX_SIZE 100
// basically at least how many bytes the block itself serializes to without the miner tx
#define BLOCK_SIZE_SANITY_LEEWAY 100
namespace cryptonote
{
const command_line::arg_descriptor<bool, false> arg_testnet_on = {
@@ -1417,18 +1420,21 @@ namespace cryptonote
{
TRY_ENTRY();
// load json & DNS checkpoints every 10min/hour respectively,
// and verify them with respect to what blocks we already have
CHECK_AND_ASSERT_MES(update_checkpoints(), false, "One or more checkpoints loaded from json or dns conflicted with existing checkpoints.");
bvc = boost::value_initialized<block_verification_context>();
if(block_blob.size() > get_max_block_size())
if (!check_incoming_block_size(block_blob))
{
LOG_PRINT_L1("WRONG BLOCK BLOB, too big size " << block_blob.size() << ", rejected");
bvc.m_verifivation_failed = true;
return false;
}
if (((size_t)-1) <= 0xffffffff && block_blob.size() >= 0x3fffffff)
MWARNING("This block's size is " << block_blob.size() << ", closing on the 32 bit limit");
// load json & DNS checkpoints every 10min/hour respectively,
// and verify them with respect to what blocks we already have
CHECK_AND_ASSERT_MES(update_checkpoints(), false, "One or more checkpoints loaded from json or dns conflicted with existing checkpoints.");
block lb;
if (!b)
{
@@ -1453,9 +1459,13 @@ namespace cryptonote
// block_blob
bool core::check_incoming_block_size(const blobdata& block_blob) const
{
if(block_blob.size() > get_max_block_size())
// note: we assume block weight is always >= block blob size, so we check incoming
// blob size against the block weight limit, which acts as a sanity check without
// having to parse/weigh first; in fact, since the block blob is the block header
// plus the tx hashes, the weight will typically be much larger than the blob size
if(block_blob.size() > m_blockchain_storage.get_current_cumulative_block_weight_limit() + BLOCK_SIZE_SANITY_LEEWAY)
{
LOG_PRINT_L1("WRONG BLOCK BLOB, too big size " << block_blob.size() << ", rejected");
LOG_PRINT_L1("WRONG BLOCK BLOB, sanity check failed on size " << block_blob.size() << ", rejected");
return false;
}
return true;