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Certain system packages contain functions which may be a possible source of non-determinism

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Originally posted by @github-code-scanning in cosmos/cosmos-sdk#13176 (comment)

0x41B45F8Be2316aF8Ab8Fa001180f44a3B0630D9e > No description provided.

/**
*Submitted for verification at polygonscan.com on 2021-12-16
*/

// File: openzeppelin-solidity/contracts/math/SafeMath.sol

pragma solidity ^0.5.2;

/**

• @title SafeMath

• @dev Unsigned math operations with safety checks that revert on error
  /
  library SafeMath {
  /*

  • @dev Multiplies two unsigned integers, reverts on overflow.
    */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
    // benefit is lost if 'b' is also tested.
    // See: OpenZeppelin/openzeppelin-contracts#522
    if (a == 0) {
    return 0;
    }

    uint256 c = a * b;
    require(c / a == b);

    return c;
    }

  /**

  • @dev Integer division of two unsigned integers truncating the quotient, reverts on division by zero.
    */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
    // Solidity only automatically asserts when dividing by 0
    require(b > 0);
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold

    return c;
    }

  /**

  • @dev Subtracts two unsigned integers, reverts on overflow (i.e. if subtrahend is greater than minuend).
    */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b <= a);
    uint256 c = a - b;

    return c;
    }

  /**

  • @dev Adds two unsigned integers, reverts on overflow.
    */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    require(c >= a);

    return c;
    }

  /**

  • @dev Divides two unsigned integers and returns the remainder (unsigned integer modulo),
  • reverts when dividing by zero.
    */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b != 0);
    return a % b;
    }
    }

// File: openzeppelin-solidity/contracts/ownership/Ownable.sol

pragma solidity ^0.5.2;

/**

• @title Ownable

• @dev The Ownable contract has an owner address, and provides basic authorization control

• functions, this simplifies the implementation of "user permissions".
  */
  contract Ownable {
  address private _owner;

  event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

  /**

  • @dev The Ownable constructor sets the original owner of the contract to the sender
  • account.
    */
    constructor () internal {
    _owner = msg.sender;
    emit OwnershipTransferred(address(0), _owner);
    }

  /**

  • @return the address of the owner.
    */
    function owner() public view returns (address) {
    return _owner;
    }

  /**

  • @dev Throws if called by any account other than the owner.
    */
    modifier onlyOwner() {
    require(isOwner());
    _;
    }

  /**

  • @return true if msg.sender is the owner of the contract.
    */
    function isOwner() public view returns (bool) {
    return msg.sender == _owner;
    }

  /**

  • @dev Allows the current owner to relinquish control of the contract.
  • It will not be possible to call the functions with the onlyOwner
  • modifier anymore.
  • @notice Renouncing ownership will leave the contract without an owner,
  • thereby removing any functionality that is only available to the owner.
    */
    function renounceOwnership() public onlyOwner {
    emit OwnershipTransferred(_owner, address(0));
    _owner = address(0);
    }

  /**

  • @dev Allows the current owner to transfer control of the contract to a newOwner.
  • @param newOwner The address to transfer ownership to.
    */
    function transferOwnership(address newOwner) public onlyOwner {
    _transferOwnership(newOwner);
    }

  /**

  • @dev Transfers control of the contract to a newOwner.
  • @param newOwner The address to transfer ownership to.
    */
    function _transferOwnership(address newOwner) internal {
    require(newOwner != address(0));
    emit OwnershipTransferred(_owner, newOwner);
    _owner = newOwner;
    }
    }

// File: contracts/common/mixin/ChainIdMixin.sol

pragma solidity ^0.5.2;

contract ChainIdMixin {
bytes constant public networkId = hex"89";
uint256 constant public CHAINID = 137;
}

// File: contracts/child/misc/EIP712.sol

pragma solidity ^0.5.2;

contract LibEIP712Domain is ChainIdMixin {
string internal constant EIP712_DOMAIN_SCHEMA = "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)";
bytes32 public constant EIP712_DOMAIN_SCHEMA_HASH = keccak256(
abi.encodePacked(EIP712_DOMAIN_SCHEMA)
);

string internal constant EIP712_DOMAIN_NAME = "Matic Network";
string internal constant EIP712_DOMAIN_VERSION = "1";
uint256 internal constant EIP712_DOMAIN_CHAINID = CHAINID;

bytes32 public EIP712_DOMAIN_HASH;

constructor() public {
    EIP712_DOMAIN_HASH = keccak256(
        abi.encode(
            EIP712_DOMAIN_SCHEMA_HASH,
            keccak256(bytes(EIP712_DOMAIN_NAME)),
            keccak256(bytes(EIP712_DOMAIN_VERSION)),
            EIP712_DOMAIN_CHAINID,
            address(this)
        )
    );
}

function hashEIP712Message(bytes32 hashStruct)
    internal
    view
    returns (bytes32 result)
{
    bytes32 domainHash = EIP712_DOMAIN_HASH;

    // Assembly for more efficient computing:
    // keccak256(abi.encode(
    //     EIP191_HEADER,
    //     domainHash,
    //     hashStruct
    // ));

    assembly {
        // Load free memory pointer
        let memPtr := mload(64)

        mstore(
            memPtr,
            0x1901000000000000000000000000000000000000000000000000000000000000
        ) // EIP191 header
        mstore(add(memPtr, 2), domainHash) // EIP712 domain hash
        mstore(add(memPtr, 34), hashStruct) // Hash of struct

        // Compute hash
        result := keccak256(memPtr, 66)
    }
    return result;
}

}

// File: contracts/child/misc/LibTokenTransferOrder.sol

pragma solidity ^0.5.2;

contract LibTokenTransferOrder is LibEIP712Domain {
string internal constant EIP712_TOKEN_TRANSFER_ORDER_SCHEMA = "TokenTransferOrder(address spender,uint256 tokenIdOrAmount,bytes32 data,uint256 expiration)";
bytes32 public constant EIP712_TOKEN_TRANSFER_ORDER_SCHEMA_HASH = keccak256(
abi.encodePacked(EIP712_TOKEN_TRANSFER_ORDER_SCHEMA)
);

struct TokenTransferOrder {
    address spender;
    uint256 tokenIdOrAmount;
    bytes32 data;
    uint256 expiration;
}

function getTokenTransferOrderHash(
    address spender,
    uint256 tokenIdOrAmount,
    bytes32 data,
    uint256 expiration
) public view returns (bytes32 orderHash) {
    orderHash = hashEIP712Message(
        hashTokenTransferOrder(spender, tokenIdOrAmount, data, expiration)
    );
}

function hashTokenTransferOrder(
    address spender,
    uint256 tokenIdOrAmount,
    bytes32 data,
    uint256 expiration
) internal pure returns (bytes32 result) {
    bytes32 schemaHash = EIP712_TOKEN_TRANSFER_ORDER_SCHEMA_HASH;

    // Assembly for more efficiently computing:
    // return keccak256(abi.encode(
    //   schemaHash,
    //   spender,
    //   tokenIdOrAmount,
    //   data,
    //   expiration
    // ));

    assembly {
        // Load free memory pointer
        let memPtr := mload(64)

        mstore(memPtr, schemaHash) // hash of schema
        mstore(
            add(memPtr, 32),
            and(spender, 0xffffffffffffffffffffffffffffffffffffffff)
        ) // spender
        mstore(add(memPtr, 64), tokenIdOrAmount) // tokenIdOrAmount
        mstore(add(memPtr, 96), data) // hash of data
        mstore(add(memPtr, 128), expiration) // expiration

        // Compute hash
        result := keccak256(memPtr, 160)
    }
    return result;
}

}

// File: contracts/child/ChildToken.sol

pragma solidity ^0.5.2;

contract ChildToken is Ownable, LibTokenTransferOrder {
using SafeMath for uint256;

// ERC721/ERC20 contract token address on root chain
address public token;
address public parent;
address public parentOwner;

mapping(bytes32 => bool) public disabledHashes;

modifier isParentOwner() {
    require(msg.sender == parentOwner);
    _;
}

function deposit(address user, uint256 amountOrTokenId) public;
function withdraw(uint256 amountOrTokenId) public payable;
function setParent(address _parent) public;

event LogFeeTransfer(
    address indexed token,
    address indexed from,
    address indexed to,
    uint256 amount,
    uint256 input1,
    uint256 input2,
    uint256 output1,
    uint256 output2
);

function ecrecovery(bytes32 hash, bytes memory sig)
    public
    pure
    returns (address result)
{
    bytes32 r;
    bytes32 s;
    uint8 v;
    if (sig.length != 65) {
        return address(0x0);
    }
    assembly {
        r := mload(add(sig, 32))
        s := mload(add(sig, 64))
        v := and(mload(add(sig, 65)), 255)
    }
    // https://github.com/ethereum/go-ethereum/issues/2053
    if (v < 27) {
        v += 27;
    }
    if (v != 27 && v != 28) {
        return address(0x0);
    }
    // get address out of hash and signature
    result = ecrecover(hash, v, r, s);
    // ecrecover returns zero on error
    require(result != address(0x0), "Error in ecrecover");
}

}

// File: contracts/child/BaseERC20Fix.sol

pragma solidity ^0.5.2;

contract BaseERC20 is ChildToken {
event Deposit(
address indexed token,
address indexed from,
uint256 amount,
uint256 input1,
uint256 output1
);

event Withdraw(
    address indexed token,
    address indexed from, uint256 amount,
    uint256 input1,
    uint256 output1
);

event LogTransfer(
    address indexed token,
    address indexed from,
    address indexed to,
    uint256 amount,
    uint256 input1,
    uint256 input2,
    uint256 output1,
    uint256 output2
);

constructor() public {}

function transferWithSig(
    bytes calldata sig,
    uint256 amount,
    bytes32 data,
    uint256 expiration,
    address to
) external returns (address from) {
revert("Disabled feature");
}

function balanceOf(address account) external view returns (uint256);
function _transfer(address sender, address recipient, uint256 amount)
    internal;

/// @param from Address from where tokens are withdrawn.
/// @param to Address to where tokens are sent.
/// @param value Number of tokens to transfer.
/// @return Returns success of function call.
function _transferFrom(address from, address to, uint256 value)
    internal
    returns (bool)
{
    uint256 input1 = this.balanceOf(from);
    uint256 input2 = this.balanceOf(to);
    _transfer(from, to, value);
    emit LogTransfer(
        token,
        from,
        to,
        value,
        input1,
        input2,
        this.balanceOf(from),
        this.balanceOf(to)
    );
    return true;
}

}

// File: contracts/child/MRC20.sol

pragma solidity ^0.5.11;

/**

• @title Matic token contract

• @notice This contract is an ECR20 like wrapper over native ether (matic token) transfers on the matic chain

• @dev ERC20 methods have been made payable while keeping their method signature same as other ChildERC20s on Matic
  */
  contract MRC20 is BaseERC20 {
  event Transfer(address indexed from, address indexed to, uint256 value);

  uint256 public currentSupply = 0;
  uint8 private constant DECIMALS = 18;
  bool isInitialized;

  constructor() public {}

  function initialize(address _childChain, address _token) public {
  // Todo: once BorValidator(@0x1000) contract added uncomment me
  // require(msg.sender == address(0x1000));
  require(!isInitialized, "The contract is already initialized");
  isInitialized = true;
  token = _token;
  _transferOwnership(_childChain);
  }

  function setParent(address) public {
  revert("Disabled feature");
  }

  function deposit(address user, uint256 amount) public onlyOwner {
  // check for amount and user
  require(
  amount > 0 && user != address(0x0),
  "Insufficient amount or invalid user"
  );

   // input balance
   uint256 input1 = balanceOf(user);
  
   // transfer amount to user
   address payable _user = address(uint160(user));
   _user.transfer(amount);
  
   currentSupply = currentSupply.add(amount);
  
   // deposit events
   emit Deposit(token, user, amount, input1, balanceOf(user));
  

  }

  function withdraw(uint256 amount) public payable {
  address user = msg.sender;
  // input balance
  uint256 input = balanceOf(user);

   currentSupply = currentSupply.sub(amount);
   // check for amount
   require(
       amount > 0 && msg.value == amount,
       "Insufficient amount"
   );
  
   // withdraw event
   emit Withdraw(token, user, amount, input, balanceOf(user));
  

  }

  function name() public pure returns (string memory) {
  return "Matic Token";
  }

  function symbol() public pure returns (string memory) {
  return "MATIC";
  }

  function decimals() public pure returns (uint8) {
  return DECIMALS;
  }

  function totalSupply() public view returns (uint256) {
  return 10000000000 * 10**uint256(DECIMALS);
  }

  function balanceOf(address account) public view returns (uint256) {
  return account.balance;
  }

  /// @dev Function that is called when a user or another contract wants to transfer funds.
  /// @param to Address of token receiver.
  /// @param value Number of tokens to transfer.
  /// @return Returns success of function call.
  function transfer(address to, uint256 value) public payable returns (bool) {
  if (msg.value != value) {
  return false;
  }
  return _transferFrom(msg.sender, to, value);
  }

  /**

  • @dev _transfer is invoked by _transferFrom method that is inherited from BaseERC20.
  • This enables us to transfer MaticEth between users while keeping the interface same as that of an ERC20 Token.
    */
    function _transfer(address sender, address recipient, uint256 amount)
    internal
    {
    require(recipient != address(this), "can't send to MRC20");
    address(uint160(recipient)).transfer(amount);
    emit Transfer(sender, recipient, amount);
    }
    }

Originally posted by @Arastoi in eveem-org/panoramix#87 (comment)