From 1e3177de220b1590704c96572fce820bfc87281e Mon Sep 17 00:00:00 2001
From: James Prestwich <10149425+prestwich@users.noreply.github.com>
Date: Tue, 7 Mar 2023 06:20:04 -0800
Subject: [PATCH] accounts/usbwallet: mitigate ledger app chunking issue
 (#26773)

This PR mitigates an issue with Ledger's on-device RLP deserialization, see
https://github.com/LedgerHQ/app-ethereum/issues/409

Ledger's RLP deserialization code does not validate the length of the RLP list received,
and it may prematurely enter the signing flow when a APDU chunk boundary falls immediately
before the EIP-155 chain_id when deserializing a transaction. Since the chain_id is
uninitialized, it is 0 during this signing flow. This may cause the user to accidentally
sign the transaction with chain_id = 0. That signature would be returned from the device 1
packet earlier than expected by the communication loop. The device blocks the
second-to-last packet waiting for the signer flow, and then errors on the successive
packet (which contains the chain_id, zeroed r, and zeroed s)

Since the signature's early arrival causes successive errors during the communication
process, geth does not parse the improper signature produced by the device, and therefore
no improperly-signed transaction can be created. User funds are not at risk.

We mitigate by selecting the highest chunk size that leaves at least 4 bytes in the
final chunk.
---
 accounts/usbwallet/ledger.go | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/accounts/usbwallet/ledger.go b/accounts/usbwallet/ledger.go
index cda94280fdd2..723df0f2b352 100644
--- a/accounts/usbwallet/ledger.go
+++ b/accounts/usbwallet/ledger.go
@@ -59,6 +59,8 @@ const (
 	ledgerP1InitTransactionData     ledgerParam1 = 0x00 // First transaction data block for signing
 	ledgerP1ContTransactionData     ledgerParam1 = 0x80 // Subsequent transaction data block for signing
 	ledgerP2DiscardAddressChainCode ledgerParam2 = 0x00 // Do not return the chain code along with the address
+
+	ledgerEip155Size int = 3 // Size of the EIP-155 chain_id,r,s in unsigned transactions
 )
 
 // errLedgerReplyInvalidHeader is the error message returned by a Ledger data exchange
@@ -347,9 +349,15 @@ func (w *ledgerDriver) ledgerSign(derivationPath []uint32, tx *types.Transaction
 		op    = ledgerP1InitTransactionData
 		reply []byte
 	)
+
+	// Chunk size selection to mitigate an underlying RLP deserialization issue on the ledger app.
+	// https://github.com/LedgerHQ/app-ethereum/issues/409
+	chunk := 255
+	for ; len(payload)%chunk <= ledgerEip155Size; chunk-- {
+	}
+
 	for len(payload) > 0 {
 		// Calculate the size of the next data chunk
-		chunk := 255
 		if chunk > len(payload) {
 			chunk = len(payload)
 		}