From a3f5756384a7aa11eaccd55c7f7da67702bdb126 Mon Sep 17 00:00:00 2001
From: gajinder <develop@g11tech.io>
Date: Fri, 3 May 2024 17:31:34 +0530
Subject: [PATCH] Update EIP-3935: restrict contract input to 8 bytes to
 prevent overflow in checks

---
 EIPS/eip-2935.md | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/EIPS/eip-2935.md b/EIPS/eip-2935.md
index 3ab311ccd6029c..1c3bedde8b79e6 100644
--- a/EIPS/eip-2935.md
+++ b/EIPS/eip-2935.md
@@ -71,8 +71,8 @@ def resolve_blockhash(block: Block, state: State, arg: uint64):
 Exact evm assembly that can be used for the contract to resolve `BLOCKHASH`
 
 ```
-// check if inputsize>32 revert
-push1 0x20
+// check if inputsize>8 revert
+push1 0x08
 calldatasize
 gt
 push1 0x31
@@ -88,7 +88,7 @@ gt
 push1 0x29
 jumpi
 
-// check if blocknumber > input + 8192 then return 0
+// check if blocknumber > input + 8192 then return 0, no overflow expected for input of 8 bytes
 push0
 calldataload
 push2 0x2000
@@ -130,6 +130,8 @@ revert
 stop
 ```
 
+<!-- TODO: bytecode is based off on first version and will be updated once assembley is locked down as it changes contract sender and address -->
+
 Corresponding bytecode:
 `60203611603157600143035f35116029575f356120000143116029576120005f3506545f5260205ff35b5f5f5260205ff35b5f5ffd00`