EIP-3455: SUDO Opcode


  Ethereum Improvement Proposals
        
        
          
            
              
            
          
        

        AllCoreNetworkingInterfaceERCMetaInformational

      



      
        
  
    

  
    
      🚧 Stagnant
    
    
    
    
    
      Standards Track: Core
    
  
  
    
      EIP-3455: SUDO Opcode
    
    
      
        
      
    
    
      
        
      
    
  

  A new opcode is introduced to allow calling from an arbitrary sender address.

  	Authors	William Morriss (@wjmelements), Baptiste Vauthey (@thabaptiser)
	Created	2021-04-01
	Discussion Link	https://ethereum-magicians.org/t/eip-3455-sudo-opcode/5860


  


  

  
    Table of Contents

    	Abstract
	Motivation
	Specification
	Rationale
	Security Considerations
	Copyright



  


  
      
      
         Abstract
      
      
    

A new opcode, SUDO, is introduced with the same parameters as CALL, plus another parameter to specify the sender address.

  
    
      
      
         Motivation
      
      
    

There are many use cases for being able to set the sender.


Many tokens are stuck irretrievably because nobody has the key for the owner address.
In particular, at address zero there is approximately 17 billion USD in tokens and ether, according to etherscan.
With SUDO, anyone could free that value, leading to an economic boom that would end poverty and world hunger.
Instead it is sitting there idle like the gold in Fort Knox.
SUDO fixes this.


It is a common mistake to send ERC-20 tokens to the token address instead of the intended recipient.
This happens because users paste the token address into the recipient fields.
Currently there is no way to recover these tokens.
SUDO fixes this.


Many scammers have fraudulently received tokens and ETH via trust-trading.
Their victims currently have no way to recover their funds.
SUDO fixes this.


Large amounts of users have accidentally locked up tokens and ether by losing their private keys.
This is inefficient and provides a bad user experience.
To accommodate new and inexperienced users, there needs to be a way to recover funds after the private key has been lost.
SUDO fixes this.


Finally, there are many tokens and ether sitting in smart contracts locked due to a bug.
We could finally close EIP issue #156.
We cannot currently reclaim ether from stuck accounts.
SUDO fixes this.

  
    
      
      
         Specification
      
      
    

Adds a new opcode (SUDO) at 0xf8.
SUDO pops 8 parameters from the stack.
Besides the sender parameter, the parameters shall match CALL.


	Gas: Integer; Maximum gas allowance for message call, safely using current gas counter if the counter is lower
	Sender: Address, truncated to lower 40 bytes; Sets CALLER inside the call frame
	To: Address, truncated to lower 40 bytes; sets ADDRESS
	Value: Integer, raises exception amount specified is less than the value in Sender account; transferred with call to recipient balance, sets CALLVALUE
	InStart: Integer; beginning of memory to use for CALLDATA
	InSize: Integer; length of memory to use for CALLDATA
	OutStart: Integer; beginning of memory to replace with RETURNDATA
	OutSize: Integer; maximum RETURNDATA to place in memory



Following execution, SUDO pushes a result value to the stack, indicating success or failure.
If the call ended with STOP, RETURN, or SELFDESTRUCT, 1 is pushed.
If the call ended with REVERT, INVALID, or an EVM assertion, 0 is pushed.

  
    
      
      
         Rationale
      
      
    

The GAS parameter is first so that callers can tediously compute how much of their remaining gas to send at the last possible moment.
The remaining parameters inherited from CALL are in the same order, with sender inserted between.

  
    
      
      
         Security Considerations
      
      
    

It will be fine.

  
    
      
      
         Copyright
      
      
    

Copyright and related rights waived via CC0.


  Citation

  Please cite this document as:

  
  William Morriss (@wjmelements), Baptiste Vauthey (@thabaptiser), "EIP-3455: SUDO Opcode [DRAFT]," Ethereum Improvement Proposals, no. 3455, April 2021. [Online serial]. Available: https://eips.ethereum.org/EIPS/eip-3455.






      
    
  

  

    Ethereum Improvement Proposals


    
      
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        Ethereum Improvement Proposals (EIPs) describe standards for the Ethereum platform, including core protocol specifications, client APIs, and contract standards.