Utilize anti-DoS headers download strategy

Avoid permanently storing headers from a peer, unless the headers are part of a
chain with sufficiently high work. This prevents memory attacks using low-work
headers.

Designed and co-authored with Pieter Wuille.

1 files changed, 2 insertions, 1 deletions

diff --git a/test/functional/p2p_dos_header_tree.py b/test/functional/p2p_dos_header_tree.py
index fde1e4bfa2..7e26994511 100755
--- a/test/functional/p2p_dos_header_tree.py
+++ b/test/functional/p2p_dos_header_tree.py
@@ -22,6 +22,7 @@ class RejectLowDifficultyHeadersTest(BitcoinTestFramework):
         self.setup_clean_chain = True
         self.chain = 'testnet3'  # Use testnet chain because it has an early checkpoint
         self.num_nodes = 2
+        self.extra_args = [["-minimumchainwork=0x0"], ["-minimumchainwork=0x0"]]
 
     def add_options(self, parser):
         parser.add_argument(
@@ -62,7 +63,7 @@ class RejectLowDifficultyHeadersTest(BitcoinTestFramework):
 
         self.log.info("Feed all fork headers (succeeds without checkpoint)")
         # On node 0 it succeeds because checkpoints are disabled
-        self.restart_node(0, extra_args=['-nocheckpoints'])
+        self.restart_node(0, extra_args=['-nocheckpoints', "-minimumchainwork=0x0"])
         peer_no_checkpoint = self.nodes[0].add_p2p_connection(P2PInterface())
         peer_no_checkpoint.send_and_ping(msg_headers(self.headers_fork))
         assert {