core: verify genesis extradata for clique (#24470)

* Add extra-data checks for clique genesis * Update genesis.go * Update genesis.go * core: simplify clique genesis check Co-authored-by: Felix Lange <fjl@twurst.com> Co-authored-by: Martin Holst Swende <martin@swende.se>
ethereum · Mar 30, 2022 · 8cacb42 · 8cacb42
1 parent 9f75994
commit 8cacb42
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/core/genesis.go b/core/genesis.go
@@ -397,7 +397,7 @@ func (g *Genesis) Commit(db ethdb.Database) (*types.Block, error) {
 	if err := config.CheckConfigForkOrder(); err != nil {
 		return nil, err
 	}
-	if config.Clique != nil && len(block.Extra()) == 0 {
+	if config.Clique != nil && len(block.Extra()) < 32+crypto.SignatureLength {
 		return nil, errors.New("can't start clique chain without signers")
 	}
 	if err := g.Alloc.write(db, block.Hash()); err != nil {