trailofbits/manticore

Report only used calldata

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#977 opened on Jul 14, 2018

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 (0 comments) (0 reactions) (0 assignees)Python (3,469 stars) (481 forks)batch import
ethereumhelp wanted

Description

Track what is used of the calldata so the ports look better. ex. only 4 bytes used here:

Transactions Nr. 2
Type: CALL (0)
From: attacker(0x1bfa530d5d685155e98cd7d9dd23f7b6a801cfef) 
To: contract0(0x67518339e369ab3d591d3569ab0a0d83b2ff5198) 
Value: 0 (*)
Data: 633ab5e063636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363636363 (*)

Contributor guide

Tech stack
python
Domain
tooling
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
under 1 hour
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Python
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70
Research direction
Investigate the report generation code in manticore, likely in manticore/core or manticore/ethereum modules. Identify where full calldata is printed and modify it to only show the bytes that are actually used by the contract. The example shows the first 4 bytes (function selector) are used; implement logic to detect used bytes based on execution trace or calldata consumption.