Use arbitrary config object in full_stack_target fuzzer

As we've added more and more configuration parameters which change
our behavior, we're increasingly missing coverage in the general
`full_stack_target` fuzzer. Sadly, a reachable `unwrap` slipped in
uncaught that should have been stopped by the `full_stack_target`.

Here, we update the `full_stack_target` fuzzer to read a full
config object to substantially increase coverage.

diff --git a/fuzz/src/full_stack.rs b/fuzz/src/full_stack.rs
index 2df63cf5453b0b63903c5214f5561f2bb3709fa9..c7afd69bb3b5741fcf2ed84b9943eeaf0fad351e 100644 (file)
--- a/fuzz/src/full_stack.rs
+++ b/fuzz/src/full_stack.rs
@@ -48,11 +48,11 @@ use lightning::onion_message::messenger::{Destination, MessageRouter, OnionMessa
 use lightning::routing::gossip::{P2PGossipSync, NetworkGraph};
 use lightning::routing::utxo::UtxoLookup;
 use lightning::routing::router::{InFlightHtlcs, PaymentParameters, Route, RouteParameters, Router};
-use lightning::util::config::{UserConfig, MaxDustHTLCExposure};
+use lightning::util::config::UserConfig;
 use lightning::util::errors::APIError;
 use lightning::util::test_channel_signer::{TestChannelSigner, EnforcementState};
 use lightning::util::logger::Logger;
-use lightning::util::ser::{ReadableArgs, Writeable};
+use lightning::util::ser::{Readable, ReadableArgs, Writeable};
 
 use crate::utils::test_logger;
 use crate::utils::test_persister::TestPersister;
@@ -438,7 +438,17 @@ impl SignerProvider for KeyProvider {
 }
 
 #[inline]
-pub fn do_test(data: &[u8], logger: &Arc<dyn Logger>) {
+pub fn do_test(mut data: &[u8], logger: &Arc<dyn Logger>) {
+       if data.len() < 32 { return; }
+
+       let our_network_key = match SecretKey::from_slice(&data[..32]) {
+               Ok(key) => key,
+               Err(e) => return,
+       };
+       data = &data[32..];
+
+       let config: UserConfig = if let Ok(config) = Readable::read(&mut data) { config } else { return; };
+
        let input = Arc::new(InputData {
                data: data.to_vec(),
                read_pos: AtomicUsize::new(0),
@@ -466,10 +476,6 @@ pub fn do_test(data: &[u8], logger: &Arc<dyn Logger>) {
                }
        }
 
-       let our_network_key = match SecretKey::from_slice(get_slice!(32)) {
-               Ok(key) => key,
-               Err(_) => return,
-       };
 
        let inbound_payment_key = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 42];
 
@@ -483,10 +489,6 @@ pub fn do_test(data: &[u8], logger: &Arc<dyn Logger>) {
                counter: AtomicU64::new(0),
                signer_state: RefCell::new(HashMap::new())
        });
-       let mut config = UserConfig::default();
-       config.channel_config.forwarding_fee_proportional_millionths =  slice_to_be32(get_slice!(4));
-       config.channel_config.max_dust_htlc_exposure = MaxDustHTLCExposure::FeeRateMultiplier(5_000_000 / 253);
-       config.channel_handshake_config.announced_channel = get_slice!(1)[0] != 0;
        let network = Network::Bitcoin;
        let best_block_timestamp = genesis_block(network).header.time;
        let params = ChainParameters {
@@ -782,8 +784,7 @@ mod tests {
                // Writing new code generating transactions and see a new failure ? Don't forget to add input for the FuzzEstimator !
 
                // 0100000000000000000000000000000000000000000000000000000000000000 - our network key
-               // 00000000 - fee_proportional_millionths
-               // 01 - announce_channels_publicly
+               // 0000000000900000000000000000640001000000000001ffff0000000000000000ffffffffffffffffffffffffffffffff0000000000000000ffffffffffffffff000000ffffffff00ffff1a000400010000020400000000040200000a08ffffffffffffffff0001000000 - config
                //
                // 00 - new outbound connection with id 0
                // 030000000000000000000000000000000000000000000000000000000000000002 - peer's pubkey
@@ -793,7 +794,7 @@ mod tests {
                // 030012 - inbound read from peer id 0 of len 18
                // 0010 03000000000000000000000000000000 - message header indicating message length 16
                // 030020 - inbound read from peer id 0 of len 32
-               // 0010 00021aaa 0008aaaaaaaaaaaa9aaa 03000000000000000000000000000000 - init message (type 16) with static_remotekey required and other bits optional and mac
+               // 0010 00021aaa 0008aaa20aaa2a0a9aaa 03000000000000000000000000000000 - init message (type 16) with static_remotekey required, no channel_type/anchors/taproot, and other bits optional and mac
                //
                // 030012 - inbound read from peer id 0 of len 18
                // 0147 03000000000000000000000000000000 - message header indicating message length 327
@@ -841,7 +842,7 @@ mod tests {
                // 030112 - inbound read from peer id 1 of len 18
                // 0010 01000000000000000000000000000000 - message header indicating message length 16
                // 030120 - inbound read from peer id 1 of len 32
-               // 0010 00021aaa 0008aaaaaaaaaaaa9aaa 01000000000000000000000000000000 - init message (type 16) with static_remotekey required and other bits optional and mac
+               // 0010 00021aaa 0008aaa20aaa2a0a9aaa 01000000000000000000000000000000 - init message (type 16) with static_remotekey required, no channel_type/anchors/taproot, and other bits optional and mac
                //
                // 05 01 030200000000000000000000000000000000000000000000000000000000000000 00c350 0003e8 - create outbound channel to peer 1 for 50k sat
                // 00fd - One feerate requests (all returning min feerate) (gonna be ingested by FuzzEstimator)
@@ -855,8 +856,6 @@ mod tests {
                //
                // 0a - create the funding transaction (client should send funding_created now)
                //
-               // 00fd00fd - Two feerate requests (calculating max dust exposure) (all returning min feerate) (gonna be ingested by FuzzEstimator)
-               //
                // 030112 - inbound read from peer id 1 of len 18
                // 0062 01000000000000000000000000000000 - message header indicating message length 98
                // 030172 - inbound read from peer id 1 of len 114
@@ -885,8 +884,6 @@ mod tests {
                // 0300c1 - inbound read from peer id 0 of len 193
                // ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff ab00000000000000000000000000000000000000000000000000000000000000 03000000000000000000000000000000 - end of update_add_htlc from 0 to 1 via client and mac
                //
-               // 00fd - One feerate request (calculating max dust exposure) (all returning min feerate) (gonna be ingested by FuzzEstimator)
-               //
                // 030012 - inbound read from peer id 0 of len 18
                // 0064 03000000000000000000000000000000 - message header indicating message length 100
                // 030074 - inbound read from peer id 0 of len 116
@@ -901,8 +898,6 @@ mod tests {
                // 07 - process the now-pending HTLC forward
                // - client now sends id 1 update_add_htlc and commitment_signed (CHECK 7: UpdateHTLCs event for node 03020000 with 1 HTLCs for channel 3f000000)
                //
-               // 00fd00fd - Two feerate requests (calculating max dust exposure) (all returning min feerate) (gonna be ingested by FuzzEstimator)
-               //
                // - we respond with commitment_signed then revoke_and_ack (a weird, but valid, order)
                // 030112 - inbound read from peer id 1 of len 18
                // 0064 01000000000000000000000000000000 - message header indicating message length 100
@@ -946,8 +941,6 @@ mod tests {
                // 0300c1 - inbound read from peer id 0 of len 193
                // ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff ab00000000000000000000000000000000000000000000000000000000000000 03000000000000000000000000000000 - end of update_add_htlc from 0 to 1 via client and mac
                //
-               // 00fd - One feerate request (calculating max dust exposure) (all returning min feerate) (gonna be ingested by FuzzEstimator)
-               //
                // - now respond to the update_fulfill_htlc+commitment_signed messages the client sent to peer 0
                // 030012 - inbound read from peer id 0 of len 18
                // 0063 03000000000000000000000000000000 - message header indicating message length 99
@@ -969,8 +962,6 @@ mod tests {
                // - client now sends id 1 update_add_htlc and commitment_signed (CHECK 7 duplicate)
                // - we respond with revoke_and_ack, then commitment_signed, then update_fail_htlc
                //
-               // 00fd00fd - Two feerate requests (calculating max dust exposure) (all returning min feerate) (gonna be ingested by FuzzEstimator)
-               //
                // 030112 - inbound read from peer id 1 of len 18
                // 0064 01000000000000000000000000000000 - message header indicating message length 100
                // 030174 - inbound read from peer id 1 of len 116
@@ -1026,8 +1017,6 @@ mod tests {
                // 0300c1 - inbound read from peer id 0 of len 193
                // ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff 5300000000000000000000000000000000000000000000000000000000000000 03000000000000000000000000000000 - end of update_add_htlc from 0 to 1 via client and mac
                //
-               // 00fd - One feerate request (calculating max dust exposure) (all returning min feerate) (gonna be ingested by FuzzEstimator)
-               //
                // 030012 - inbound read from peer id 0 of len 18
                // 00a4 03000000000000000000000000000000 - message header indicating message length 164
                // 0300b4 - inbound read from peer id 0 of len 180
@@ -1042,8 +1031,6 @@ mod tests {
                // 07 - process the now-pending HTLC forward
                // - client now sends id 1 update_add_htlc and commitment_signed (CHECK 7 duplicate)
                //
-               // 00fd00fd - Two feerate requests (calculating max dust exposure) (all returning min feerate) (gonna be ingested by FuzzEstimator)
-               //
                // 0c007d - connect a block with one transaction of len 125
                // 02000000013a000000000000000000000000000000000000000000000000000000000000000000000000000000800258020000000000002200204b0000000000000000000000000000000000000000000000000000000000000014c0000000000000160014280000000000000000000000000000000000000005000020 - the commitment transaction for channel 3f00000000000000000000000000000000000000000000000000000000000000
                //
@@ -1059,7 +1046,7 @@ mod tests {
                // - client now fails the HTLC backwards as it was unable to extract the payment preimage (CHECK 9 duplicate and CHECK 10)
 
                let logger = Arc::new(TrackingLogger { lines: Mutex::new(HashMap::new()) });
-               super::do_test(&<Vec<u8>>::from_hex("01000000000000000000000000000000000000000000000000000000000000000000000001000300000000000000000000000000000000000000000000000000000000000000020300320003000000000000000000000000000000000000000000000000000000000000000203000000000000000000000000000000030012001003000000000000000000000000000000030020001000021aaa0008aaaaaaaaaaaa9aaa030000000000000000000000000000000300120147030000000000000000000000000000000300fe00206fe28c0ab6f1b372c1a6a246ae63f74f931e8365e15a089c68d6190000000000ff4f00f805273c1b203bb5ebf8436bfde57b3be8c2f5e95d9491dbb181909679000000000000c35000000000000000000000000000000162ffffffffffffffff00000000000002220000000000000000000000fd000601e3030000000000000000000000000000000000000000000000000000000000000001030000000000000000000000000000000000000000000000000000000000000002030000000000000000000000000000000000000000000000000000000000000003030000000000000000000000000000000000000000000000000000000000000004030059030000000000000000000000000000000000000000000000000000000000000005020900000000000000000000000000000000000000000000000000000000000000010000010210000300000000000000000000000000000000fd0300120084030000000000000000000000000000000300940022ff4f00f805273c1b203bb5ebf8436bfde57b3be8c2f5e95d9491dbb1819096793d00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000210100000000000000000000000000000000000000000000000000000000000000030000000000000000000000000000000c005e020000000100000000000000000000000000000000000000000000000000000000000000000000000000ffffffff0150c3000000000000220020ae00000000000000000000000000000000000000000000000000000000000000000000000c00000c00000c00000c00000c00000c00000c00000c00000c00000c00000c00000c000003001200430300000000000000000000000000000003005300243d0000000000000000000000000000000000000000000000000000000000000002080000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000010301320003000000000000000000000000000000000000000000000000000000000000000703000000000000000000000000000000030142000302000000000000000000000000000000000000000000000000000000000000000300000000000000000000000000000003000000000000000000000000000000030112001001000000000000000000000000000000030120001000021aaa0008aaaaaaaaaaaa9aaa01000000000000000000000000000000050103020000000000000000000000000000000000000000000000000000000000000000c3500003e800fd0301120112010000000000000000000000000000000301ff00210000000000000000000000000000000000000000000000000000000000000e05000000000000016200000000004c4b4000000000000003e800000000000003e80000000203f000050300000000000000000000000000000000000000000000000000000000000001000300000000000000000000000000000000000000000000000000000000000002000300000000000000000000000000000000000000000000000000000000000003000300000000000000000000000000000000000000000000000000000000000004000300000000000000000000000000000000000000000000000000000000000005000266000000000000000000000000000003012300000000000000000000000000000000000000010000000000000000000000000000000a00fd00fd03011200620100000000000000000000000000000003017200233a00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000007c0001000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000b03011200430100000000000000000000000000000003015300243a000000000000000000000000000000000000000000000000000000000000000267000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000003001205ac030000000000000000000000000000000300ff00803d0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003e80ff00000000000000000000000000000000000000000000000000000000000000000003f00003000000000000000000000000000000000000000000000000000000000000055511020203e80401a0060800000e00000100000a00000000000000000000000000000000000000000000000000000000000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff0300ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff0300fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff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&(Arc::clone(&logger) as Arc<dyn Logger>));
+               super::do_test(&<Vec<u8>>::from_hex("01000000000000000000000000000000000000000000000000000000000000000000000000900000000000000000640001000000000001ffff0000000000000000ffffffffffffffffffffffffffffffff0000000000000000ffffffffffffffff000000ffffffff00ffff1a000400010000020400000000040200000a08ffffffffffffffff0001000000000300000000000000000000000000000000000000000000000000000000000000020300320003000000000000000000000000000000000000000000000000000000000000000203000000000000000000000000000000030012001003000000000000000000000000000000030020001000021aaa0008aaa20aaa2a0a9aaa030000000000000000000000000000000300120147030000000000000000000000000000000300fe00206fe28c0ab6f1b372c1a6a246ae63f74f931e8365e15a089c68d6190000000000ff4f00f805273c1b203bb5ebf8436bfde57b3be8c2f5e95d9491dbb181909679000000000000c35000000000000000000000000000000162ffffffffffffffff00000000000002220000000000000000000000fd000601e3030000000000000000000000000000000000000000000000000000000000000001030000000000000000000000000000000000000000000000000000000000000002030000000000000000000000000000000000000000000000000000000000000003030000000000000000000000000000000000000000000000000000000000000004030059030000000000000000000000000000000000000000000000000000000000000005020900000000000000000000000000000000000000000000000000000000000000010000010210000300000000000000000000000000000000fd0300120084030000000000000000000000000000000300940022ff4f00f805273c1b203bb5ebf8436bfde57b3be8c2f5e95d9491dbb1819096793d00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000210100000000000000000000000000000000000000000000000000000000000000030000000000000000000000000000000c005e020000000100000000000000000000000000000000000000000000000000000000000000000000000000ffffffff0150c3000000000000220020ae00000000000000000000000000000000000000000000000000000000000000000000000c00000c00000c00000c00000c00000c00000c00000c00000c00000c00000c00000c000003001200430300000000000000000000000000000003005300243d0000000000000000000000000000000000000000000000000000000000000002080000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000010301320003000000000000000000000000000000000000000000000000000000000000000703000000000000000000000000000000030142000302000000000000000000000000000000000000000000000000000000000000000300000000000000000000000000000003000000000000000000000000000000030112001001000000000000000000000000000000030120001000021aaa0008aaa20aaa2a0a9aaa01000000000000000000000000000000050103020000000000000000000000000000000000000000000000000000000000000000c3500003e800fd0301120112010000000000000000000000000000000301ff00210000000000000000000000000000000000000000000000000000000000000e05000000000000016200000000004c4b4000000000000003e800000000000003e80000000203f000050300000000000000000000000000000000000000000000000000000000000001000300000000000000000000000000000000000000000000000000000000000002000300000000000000000000000000000000000000000000000000000000000003000300000000000000000000000000000000000000000000000000000000000004000300000000000000000000000000000000000000000000000000000000000005000266000000000000000000000000000003012300000000000000000000000000000000000000010000000000000000000000000000000a03011200620100000000000000000000000000000003017200233a00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000007c0001000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000b03011200430100000000000000000000000000000003015300243a000000000000000000000000000000000000000000000000000000000000000267000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000003001205ac030000000000000000000000000000000300ff00803d0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003e80ff00000000000000000000000000000000000000000000000000000000000000000003f00003000000000000000000000000000000000000000000000000000000000000055511020203e80401a0060800000e00000100000a00000000000000000000000000000000000000000000000000000000000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff0300ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff0300fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff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&(Arc::clone(&logger) as Arc<dyn Logger>));
 
                let log_entries = logger.lines.lock().unwrap();
                assert_eq!(log_entries.get(&("lightning::ln::peer_handler".to_string(), "Handling SendAcceptChannel event in peer_handler for node 030000000000000000000000000000000000000000000000000000000000000002 for channel ff4f00f805273c1b203bb5ebf8436bfde57b3be8c2f5e95d9491dbb181909679".to_string())), Some(&1)); // 1

diff --git a/lightning/src/util/config.rs b/lightning/src/util/config.rs
index 13284113d2ca03469166bf959ba6607d66aaef4c..2c8f03b93c89528798249868d98178cf0e23c052 100644 (file)
--- a/lightning/src/util/config.rs
+++ b/lightning/src/util/config.rs
@@ -13,6 +13,9 @@
 use crate::ln::channel::MAX_FUNDING_SATOSHIS_NO_WUMBO;
 use crate::ln::channelmanager::{BREAKDOWN_TIMEOUT, MAX_LOCAL_BREAKDOWN_TIMEOUT};
 
+#[cfg(fuzzing)]
+use crate::util::ser::Readable;
+
 /// Configuration we set when applicable.
 ///
 /// Default::default() provides sane defaults.
@@ -210,6 +213,27 @@ impl Default for ChannelHandshakeConfig {
        }
 }
 
+// When fuzzing, we want to allow the fuzzer to pick any configuration parameters. Thus, we
+// implement Readable here in a naive way (which is a bit easier for the fuzzer to handle). We
+// don't really want to ever expose this to users (if we did we'd want to use TLVs).
+#[cfg(fuzzing)]
+impl Readable for ChannelHandshakeConfig {
+       fn read<R: crate::io::Read>(reader: &mut R) -> Result<Self, crate::ln::msgs::DecodeError> {
+               Ok(Self {
+                       minimum_depth: Readable::read(reader)?,
+                       our_to_self_delay: Readable::read(reader)?,
+                       our_htlc_minimum_msat: Readable::read(reader)?,
+                       max_inbound_htlc_value_in_flight_percent_of_channel: Readable::read(reader)?,
+                       negotiate_scid_privacy: Readable::read(reader)?,
+                       announced_channel: Readable::read(reader)?,
+                       commit_upfront_shutdown_pubkey: Readable::read(reader)?,
+                       their_channel_reserve_proportional_millionths: Readable::read(reader)?,
+                       negotiate_anchors_zero_fee_htlc_tx: Readable::read(reader)?,
+                       our_max_accepted_htlcs: Readable::read(reader)?,
+               })
+       }
+}
+
 /// Optional channel limits which are applied during channel creation.
 ///
 /// These limits are only applied to our counterparty's limits, not our own.
@@ -315,6 +339,27 @@ impl Default for ChannelHandshakeLimits {
        }
 }
 
+// When fuzzing, we want to allow the fuzzer to pick any configuration parameters. Thus, we
+// implement Readable here in a naive way (which is a bit easier for the fuzzer to handle). We
+// don't really want to ever expose this to users (if we did we'd want to use TLVs).
+#[cfg(fuzzing)]
+impl Readable for ChannelHandshakeLimits {
+       fn read<R: crate::io::Read>(reader: &mut R) -> Result<Self, crate::ln::msgs::DecodeError> {
+               Ok(Self {
+                       min_funding_satoshis: Readable::read(reader)?,
+                       max_funding_satoshis: Readable::read(reader)?,
+                       max_htlc_minimum_msat: Readable::read(reader)?,
+                       min_max_htlc_value_in_flight_msat: Readable::read(reader)?,
+                       max_channel_reserve_satoshis: Readable::read(reader)?,
+                       min_max_accepted_htlcs: Readable::read(reader)?,
+                       trust_own_funding_0conf: Readable::read(reader)?,
+                       max_minimum_depth: Readable::read(reader)?,
+                       force_announced_channel_preference: Readable::read(reader)?,
+                       their_to_self_delay: Readable::read(reader)?,
+               })
+       }
+}
+
 /// Options for how to set the max dust HTLC exposure allowed on a channel. See
 /// [`ChannelConfig::max_dust_htlc_exposure`] for details.
 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
@@ -781,3 +826,22 @@ impl Default for UserConfig {
                }
        }
 }
+
+// When fuzzing, we want to allow the fuzzer to pick any configuration parameters. Thus, we
+// implement Readable here in a naive way (which is a bit easier for the fuzzer to handle). We
+// don't really want to ever expose this to users (if we did we'd want to use TLVs).
+#[cfg(fuzzing)]
+impl Readable for UserConfig {
+       fn read<R: crate::io::Read>(reader: &mut R) -> Result<Self, crate::ln::msgs::DecodeError> {
+               Ok(Self {
+                       channel_handshake_config: Readable::read(reader)?,
+                       channel_handshake_limits: Readable::read(reader)?,
+                       channel_config: Readable::read(reader)?,
+                       accept_forwards_to_priv_channels: Readable::read(reader)?,
+                       accept_inbound_channels: Readable::read(reader)?,
+                       manually_accept_inbound_channels: Readable::read(reader)?,
+                       accept_intercept_htlcs: Readable::read(reader)?,
+                       accept_mpp_keysend: Readable::read(reader)?,
+               })
+       }
+}