Backporting #6686 and #6691 (#6712)

* v1.7.4

* Fixed potential exp len overflow (#6686)

* Fix warp sync blockers detection

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 description = "Parity Ethereum client"
 name = "parity"
-version = "1.7.3"
+version = "1.7.4"
 license = "GPL-3.0"
 authors = ["Parity Technologies <[email protected]>"]
 build = "build.rs"

ethcore/src/builtin.rs

@@ -98,18 +98,17 @@ impl Pricer for ModexpPricer {
 		let exp_len = read_len();
 		let mod_len = read_len();
 
+		if mod_len.is_zero() && base_len.is_zero() {
+			return U256::zero()
+		}
+
 		let max_len = U256::from(u32::max_value() / 2);
-		if base_len > max_len || mod_len > max_len {
+		if base_len > max_len || mod_len > max_len || exp_len > max_len {
 			return U256::max_value();
 		}
+		let (base_len, exp_len, mod_len) = (base_len.low_u64(), exp_len.low_u64(), mod_len.low_u64());
 
-		let base_len = base_len.low_u64();
-		let exp_len = exp_len.low_u64();
-		let mod_len = mod_len.low_u64();
 		let m = max(mod_len, base_len);
-		if m == 0 {
-			return U256::zero();
-		}
 		// read fist 32-byte word of the exponent.
 		let exp_low = if base_len + 96 >= input.len() as u64 { U256::zero() } else {
 			let mut buf = [0; 32];
@@ -130,8 +129,7 @@ impl ModexpPricer {
 		let bit_index = if exp_low.is_zero() { 0 } else { (255 - exp_low.leading_zeros()) as u64 };
 		if len <= 32 {
 			bit_index
-		}
-		else {
+		} else {
 			8 * (len - 32) + bit_index
 		}
 	}
@@ -712,6 +710,24 @@ mod tests {
 			native: ethereum_builtin("modexp"),
 			activate_at: 0,
 		};
+
+		// test for potential exp len overflow
+		{
+			let input = FromHex::from_hex("\
+				00000000000000000000000000000000000000000000000000000000000000ff\
+				2a1e530000000000000000000000000000000000000000000000000000000000\
+				0000000000000000000000000000000000000000000000000000000000000000"
+				).unwrap();
+
+			let mut output = vec![0u8; 32];
+			let expected = FromHex::from_hex("0000000000000000000000000000000000000000000000000000000000000000").unwrap();
+			let expected_cost = U256::max_value();
+
+			f.execute(&input[..], &mut BytesRef::Fixed(&mut output[..])).expect("Builtin should fail");
+			assert_eq!(output, expected);
+			assert_eq!(f.cost(&input[..]), expected_cost.into());
+		}
+
 		// fermat's little theorem example.
 		{
 			let input = FromHex::from_hex("\

mac/Parity.pkgproj

@@ -462,7 +462,7 @@
 				<key>OVERWRITE_PERMISSIONS</key>
 				<false/>
 				<key>VERSION</key>
-				<string>1.7.3</string>
+				<string>1.7.4</string>
 			</dict>
 			<key>UUID</key>
 			<string>2DCD5B81-7BAF-4DA1-9251-6274B089FD36</string>

nsis/installer.nsi

@@ -10,7 +10,7 @@
 !define DESCRIPTION "Fast, light, robust Ethereum implementation"
 !define VERSIONMAJOR 1
 !define VERSIONMINOR 7
-!define VERSIONBUILD 3
+!define VERSIONBUILD 4
 !define ARGS "--warp"
 !define FIRST_START_ARGS "ui --warp --mode=passive"
 

parity/configuration.rs

@@ -23,7 +23,6 @@ use std::cmp::max;
 use std::str::FromStr;
 use cli::{Args, ArgsError};
 use util::{Hashable, H256, U256, Bytes, version_data, Address};
-use util::journaldb::Algorithm;
 use util::Colour;
 use ethsync::{NetworkConfiguration, is_valid_node_url, AllowIP};
 use ethcore::ethstore::ethkey::{Secret, Public};
@@ -37,7 +36,7 @@ use parity_rpc::NetworkSettings;
 use cache::CacheConfig;
 use helpers::{to_duration, to_mode, to_block_id, to_u256, to_pending_set, to_price, replace_home, replace_home_and_local,
 geth_ipc_path, parity_ipc_path, to_bootnodes, to_addresses, to_address, to_gas_limit, to_queue_strategy};
-use params::{SpecType, ResealPolicy, AccountsConfig, GasPricerConfig, MinerExtras, Pruning, Switch};
+use params::{SpecType, ResealPolicy, AccountsConfig, GasPricerConfig, MinerExtras};
 use ethcore_logger::Config as LogConfig;
 use dir::{self, Directories, default_hypervisor_path, default_local_path, default_data_path};
 use dapps::Configuration as DappsConfiguration;
@@ -123,15 +122,8 @@ impl Configuration {
 		let fat_db = self.args.flag_fat_db.parse()?;
 		let compaction = self.args.flag_db_compaction.parse()?;
 		let wal = !self.args.flag_fast_and_loose;
-		match self.args.flag_warp {
-			// Logging is not initialized yet, so we print directly to stderr
-			Some(true) if fat_db == Switch::On => writeln!(&mut stderr(), "Warning: Warp Sync is disabled because Fat DB is turned on").expect("Error writing to stderr"),
-			Some(true) if tracing == Switch::On => writeln!(&mut stderr(), "Warning: Warp Sync is disabled because tracing is turned on").expect("Error writing to stderr"),
-			Some(true) if pruning == Pruning::Specific(Algorithm::Archive) => writeln!(&mut stderr(), "Warning: Warp Sync is disabled because pruning mode is set to archive").expect("Error writing to stderr"),
-			_ => {},
-		};
 		let public_node = self.args.flag_public_node;
-		let warp_sync = !self.args.flag_no_warp && fat_db != Switch::On && tracing != Switch::On && pruning != Pruning::Specific(Algorithm::Archive);
+		let warp_sync = !self.args.flag_no_warp;
 		let geth_compatibility = self.args.flag_geth;
 		let mut dapps_conf = self.dapps_config();
 		let ipfs_conf = self.ipfs_config();

parity/run.rs

@@ -38,6 +38,7 @@ use parity_reactor::EventLoop;
 use parity_rpc::{NetworkSettings, informant, is_major_importing};
 use updater::{UpdatePolicy, Updater};
 use util::{Colour, version, Mutex, Condvar};
+use util::journaldb::Algorithm;
 
 use params::{
 	SpecType, Pruning, AccountsConfig, GasPricerConfig, MinerExtras, Switch,
@@ -474,7 +475,21 @@ pub fn execute(cmd: RunCmd, can_restart: bool, logger: Arc<RotatingLogger>) -> R
 	}
 
 	sync_config.fork_block = spec.fork_block();
-	sync_config.warp_sync = spec.engine.supports_warp() && cmd.warp_sync;
+	let mut warp_sync = cmd.warp_sync;
+	if warp_sync {
+		// Logging is not initialized yet, so we print directly to stderr
+		if fat_db {
+			warn!("Warning: Warp Sync is disabled because Fat DB is turned on.");
+			warp_sync = false;
+		} else if tracing {
+			warn!("Warning: Warp Sync is disabled because tracing is turned on.");
+			warp_sync = false;
+		} else if algorithm != Algorithm::OverlayRecent {
+			warn!("Warning: Warp Sync is disabled because of non-default pruning mode.");
+			warp_sync = false;
+		}
+	}
+	sync_config.warp_sync = spec.engine.supports_warp() && warp_sync;
 	sync_config.download_old_blocks = cmd.download_old_blocks;
 	sync_config.serve_light = cmd.serve_light;
 

util/Cargo.toml

@@ -3,7 +3,7 @@ description = "Ethcore utility library"
 homepage = "http://parity.io"
 license = "GPL-3.0"
 name = "ethcore-util"
-version = "1.7.3"
+version = "1.7.4"
 authors = ["Parity Technologies <[email protected]>"]
 build = "build.rs"