libnfuzz uses the mainnet RuntimeConfig (the default one might differ in subtle ways)

Author: zah

nfuzz/libnfuzz.nim

@@ -3,6 +3,7 @@
 
 import
   stew/ptrops, stew/ranges/ptr_arith, chronicles,
+  ../beacon_chain/networking/network_metadata,
   ../beacon_chain/spec/datatypes/phase0,
   ../beacon_chain/spec/[
     beaconstate, eth2_ssz_serialization, forks, validator, state_transition,
@@ -102,7 +103,7 @@ proc nfuzz_attestation(input: openArray[byte], xoutput: ptr byte,
 proc nfuzz_attester_slashing(input: openArray[byte], xoutput: ptr byte,
     xoutput_size: ptr uint, disable_bls: bool): bool {.exportc, raises: [FuzzCrashError, Defect].} =
   decodeAndProcess(AttesterSlashingInput):
-    process_attester_slashing(defaultRuntimeConfig, data.state, data.attesterSlashing, flags, cache).isOk
+    process_attester_slashing(mainnetMetadata.cfg, data.state, data.attesterSlashing, flags, cache).isOk
 
 proc nfuzz_block(input: openArray[byte], xoutput: ptr byte,
     xoutput_size: ptr uint, disable_bls: bool): bool {.exportc, raises: [FuzzCrashError, Defect].} =
@@ -126,7 +127,7 @@ proc nfuzz_block(input: openArray[byte], xoutput: ptr byte,
 
   decodeAndProcess(BlockInput):
     state_transition(
-      defaultRuntimeConfig, data, data.beaconBlock, flags, noRollback).isOk
+      mainnetMetadata.cfg, data, data.beaconBlock, flags, noRollback).isOk
 
 proc nfuzz_block_header(input: openArray[byte], xoutput: ptr byte,
     xoutput_size: ptr uint, disable_bls: bool): bool {.exportc, raises: [FuzzCrashError, Defect].} =
@@ -136,17 +137,17 @@ proc nfuzz_block_header(input: openArray[byte], xoutput: ptr byte,
 proc nfuzz_deposit(input: openArray[byte], xoutput: ptr byte,
     xoutput_size: ptr uint, disable_bls: bool): bool {.exportc, raises: [FuzzCrashError, Defect].} =
   decodeAndProcess(DepositInput):
-    process_deposit(defaultRuntimeConfig, data.state, data.deposit, flags).isOk
+    process_deposit(mainnetMetadata.cfg, data.state, data.deposit, flags).isOk
 
 proc nfuzz_proposer_slashing(input: openArray[byte], xoutput: ptr byte,
     xoutput_size: ptr uint, disable_bls: bool): bool {.exportc, raises: [FuzzCrashError, Defect].} =
   decodeAndProcess(ProposerSlashingInput):
-    process_proposer_slashing(defaultRuntimeConfig, data.state, data.proposerSlashing, flags, cache).isOk
+    process_proposer_slashing(mainnetMetadata.cfg, data.state, data.proposerSlashing, flags, cache).isOk
 
 proc nfuzz_voluntary_exit(input: openArray[byte], xoutput: ptr byte,
     xoutput_size: ptr uint, disable_bls: bool): bool {.exportc, raises: [FuzzCrashError, Defect].} =
   decodeAndProcess(VoluntaryExitInput):
-    process_voluntary_exit(defaultRuntimeConfig, data.state, data.exit, flags, cache).isOk
+    process_voluntary_exit(mainnetMetadata.cfg, data.state, data.exit, flags, cache).isOk
 
 # Note: Could also accept raw input pointer and access list_size + seed here.
 # However, list_size needs to be known also outside this proc to allocate xoutput.