Trivial cleanups in full_stack_target/fuzztarget

fuzz/Cargo.toml

@@ -13,6 +13,7 @@ cargo-fuzz = true
 [features]
 afl_fuzz = ["afl"]
 honggfuzz_fuzz = ["honggfuzz"]
+libfuzzer_fuzz = ["libfuzzer-sys"]
 
 [dependencies]
 afl = { version = "0.4", optional = true }
@@ -22,6 +23,7 @@ bitcoin_hashes = { git = "https://github.com/TheBlueMatt/bitcoin_hashes", branch
 hex = "0.3"
 honggfuzz = { version = "0.5", optional = true }
 secp256k1 = { version = "0.11", features=["fuzztarget"] }
+libfuzzer-sys = { git = "https://github.com/rust-fuzz/libfuzzer-sys.git", optional = true }
 
 [build-dependencies]
 cc = "1.0"

fuzz/fuzz_targets/full_stack_target.rs

@@ -1,3 +1,12 @@
+//! Test that no series of bytes received over the wire/connections created/payments sent can
+//! result in a crash. We do this by standing up a node and then reading bytes from input to denote
+//! actions such as creating new inbound/outbound connections, bytes to be read from a connection,
+//! or payments to send/ways to handle events generated.
+//! This test has been very useful, though due to its complexity good starting inputs are critical.
+
+//Uncomment this for libfuzzer builds:
+//#![no_main]
+
 extern crate bitcoin;
 extern crate bitcoin_hashes;
 extern crate lightning;
@@ -9,11 +18,12 @@ use bitcoin::blockdata::script::{Builder, Script};
 use bitcoin::blockdata::opcodes;
 use bitcoin::consensus::encode::deserialize;
 use bitcoin::network::constants::Network;
-use bitcoin::util::hash::{BitcoinHash, Sha256dHash, Hash160};
+use bitcoin::util::hash::{BitcoinHash, Sha256dHash};
 
 use bitcoin_hashes::Hash as TraitImport;
 use bitcoin_hashes::HashEngine as TraitImportEngine;
 use bitcoin_hashes::sha256::Hash as Sha256;
+use bitcoin_hashes::hash160::Hash as Hash160;
 
 use lightning::chain::chaininterface::{BroadcasterInterface,ConfirmationTarget,ChainListener,FeeEstimator,ChainWatchInterfaceUtil};
 use lightning::chain::transaction::OutPoint;
@@ -235,7 +245,7 @@ impl KeysInterface for KeyProvider {
 	fn get_destination_script(&self) -> Script {
 		let secp_ctx = Secp256k1::signing_only();
 		let channel_monitor_claim_key = SecretKey::from_slice(&secp_ctx, &hex::decode("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap();
-		let our_channel_monitor_claim_key_hash = Hash160::from_data(&PublicKey::from_secret_key(&secp_ctx, &channel_monitor_claim_key).serialize());
+		let our_channel_monitor_claim_key_hash = Hash160::hash(&PublicKey::from_secret_key(&secp_ctx, &channel_monitor_claim_key).serialize());
 		Builder::new().push_opcode(opcodes::All::OP_PUSHBYTES_0).push_slice(&our_channel_monitor_claim_key_hash[..]).into_script()
 	}
 
@@ -540,6 +550,14 @@ fn main() {
 	}
 }
 
+#[cfg(feature = "libfuzzer_fuzz")]
+#[macro_use] extern crate libfuzzer_sys;
+#[cfg(feature = "libfuzzer_fuzz")]
+fuzz_target!(|data: &[u8]| {
+	let logger: Arc<Logger> = Arc::new(test_logger::TestLogger{});
+	do_test(data, &logger);
+});
+
 extern crate hex;
 #[cfg(test)]
 mod tests {

src/util/byte_utils.rs

@@ -10,6 +10,7 @@ pub fn slice_to_be32(v: &[u8]) -> u32 {
 	((v[2] as u32) << 8*1) |
 	((v[3] as u32) << 8*0)
 }
+#[cfg(not(feature = "fuzztarget"))] // Used only by poly1305
 #[inline]
 pub fn slice_to_le32(v: &[u8]) -> u32 {
 	((v[0] as u32) << 8*0) |
@@ -54,6 +55,7 @@ pub fn be32_to_array(u: u32) -> [u8; 4] {
 	v[3] = ((u >> 8*0) & 0xff) as u8;
 	v
 }
+#[cfg(not(feature = "fuzztarget"))] // Used only by poly1305
 #[inline]
 pub fn le32_to_array(u: u32) -> [u8; 4] {
 	let mut v = [0; 4];

src/util/mod.rs

@@ -6,6 +6,7 @@ pub mod ser;
 
 pub(crate) mod byte_utils;
 pub(crate) mod chacha20;
+#[cfg(not(feature = "fuzztarget"))]
 pub(crate) mod poly1305;
 pub(crate) mod chacha20poly1305rfc;
 pub(crate) mod internal_traits;