Comments (8)
muellerberndt
commented on May 18, 2024
It looks like there are invalid characters in the input. One thing that may cause this are address placeholders in the byte code (those look like ___[contract-name]_____________). Mythril should replace those automatically, but maybe something isn't working as it should.
Not sure if you want to provide the bytecode you're analyzing? If you can, it would make debugging this easier.
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lsaether
commented on May 18, 2024
That would make a lot of sense if that's what is going on. I'm analyzing solidity code which makes heavy use of libraries so the compiler may not be linking those automatically when I run Mythril on them.
What I'll do is run the contracts through the compiler first and make sure everything is linked then run the bytecode through Mythril like you're suggesting.
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muellerberndt
commented on May 18, 2024
Hi @lsaether, were you able to solve the problem?
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muellerberndt
commented on May 18, 2024
Closing due to inactivity.
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recontrapablo
commented on May 18, 2024
I stumbled the same issue trying out mythril 0.15.8 on Ubuntu. I was able to track it down to the fact that my contract is importing a second .sol that defines a library.
I created a gist with 2 simple .sol files that trigger the error when one line is un-commented: https://gist.github.com/pablorubinstein/8e6d04c1bd9222f9e8f2819f93ad70e2
When running myth -x contract.sol I get
ValueError: non-hexadecimal number found in fromhex() arg at position 242
being the offending value:
hex_decoded_string: '[...]b600073__lib.sol:MyLib_________________________63b1a[...]'
@b-mueller: oddily, I'm able to trigger the issue outside the contract constructor, but the same code works properly in the constructor itself...
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muellerberndt
commented on May 18, 2024
oddily, I'm able to trigger the issue outside the contract constructor, but the same code works properly in the constructor itself...
This makes sense because the constructor code is not included in the runtime bytecode, and is therefore currently not analyzed (this will however change at some point).
I think at this point it doesn't make sense to implement support for ___-style linking. We're planning to implement a lightweight NodeJS version of Mythril for developers soon, which will be focused on supporting common development environments. The Solidity/Truffle support of the myth CLI was tacked on and doesn't work properly in many situations.
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muellerberndt
commented on May 18, 2024
The crash is resolved in 0.17.0 by relaxing the regex for detecting solo-style placeholders. Note that these are currently simply replaced by an all-zeroes address, so the linked library is not included in the analysis.
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p0n1
commented on May 18, 2024
Contract Code:
pragma solidity 0.4.24;
library Math {
function add(uint256 a, uint256 b) public pure returns (uint256) {
return a+b;
}
}
contract Test {
function add(uint256 a, uint256 b) public pure {
Math.add(a, b);
}
}Bytecode:
======= lib-test.sol:Test =======
Binary:
608060405234801561001057600080fd5b5061015c806100206000396000f300608060405260043610610041576000357c0100000000000000000000000000000000000000000000000000000000900463ffffffff168063771602f714610046575b600080fd5b34801561005257600080fd5b5061007b600480360381019080803590602001909291908035906020019092919050505061007d565b005b73__lib-test.sol:Math_____________________63771602f783836040518363ffffffff167c0100000000000000000000000000000000000000000000000000000000028152600401808381526020018281526020019250505060206040518083038186803b1580156100f057600080fd5b505af4158015610104573d6000803e3d6000fd5b505050506040513d602081101561011a57600080fd5b81019080805190602001909291905050505050505600a165627a7a72305820d8d824b475836c42c695a914c4658820b06e1da85e762f7aac0a1a78752353000029
Panic Reson:
65b005b73__lib-test.sol:Math_____________________63771602f78383604
Panic Log:
Traceback (most recent call last):
File "/Users/tam/Work/mythril_dev/mythril/myth", line 9, in <module>
mythril.interfaces.cli.main()
File "/Users/tam/Work/mythril_dev/mythril/mythril/interfaces/cli.py", line 177, in main
address, _ = mythril.load_from_solidity(args.solidity_file) # list of files
File "/Users/tam/Work/mythril_dev/mythril/mythril/mythril.py", line 329, in load_from_solidity
for contract in get_contracts_from_file(file, solc_args=self.solc_args):
File "/Users/tam/Work/mythril_dev/mythril/mythril/ether/soliditycontract.py", line 36, in get_contracts_from_file
yield SolidityContract(input_file, name, solc_args)
File "/Users/tam/Work/mythril_dev/mythril/mythril/ether/soliditycontract.py", line 92, in __init__
super().__init__(code, creation_code, name=name)
File "/Users/tam/Work/mythril_dev/mythril/mythril/ether/ethcontract.py", line 24, in __init__
self.creation_disassembly = Disassembly(creation_code, enable_online_lookup=enable_online_lookup)
File "/Users/tam/Work/mythril_dev/mythril/mythril/disassembler/disassembly.py", line 9, in __init__
self.instruction_list = asm.disassemble(util.safe_decode(code))
File "/Users/tam/Work/mythril_dev/mythril/mythril/ether/util.py", line 16, in safe_decode
return bytes.fromhex(hex_encoded_string)
ValueError: non-hexadecimal number found in fromhex() arg at position 318
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