e4ff240001
Fixes #6067 pc_actions_UMUL computed the product at operand width, so the extracted "high half" was always zero and CF/OF (OF = CF) were constantly 0: lo = (cc_dep1 * cc_dep2)[nbits-1:0] # truncated to nbits hi = (lo >> nbits)[nbits-1:0] # lo is nbits wide -> always 0 The sibling pc_actions_SMUL is correct because it widens first (sign_extend). Mirror it with zero_extend: multiply the operands widened to 2*nbits and take the high half. For CC_OP_MUL{B,W,L,Q}, CF = OF = (high half != 0) per the Intel SDM. This is why `imul` reported CF/OF correctly while `mul` did not (issue #6067: `mul %ebx` left CF clear). |
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| angr | ||
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| docs | ||
| native | ||
| tests | ||
| .dockerignore | ||
| .git-blame-ignore-revs | ||
| .gitignore | ||
| .pre-commit-config.yaml | ||
| .readthedocs.yml | ||
| Cargo.lock | ||
| Cargo.toml | ||
| COPYRIGHT | ||
| LICENSE | ||
| MANIFEST.in | ||
| pyproject.toml | ||
| README.md | ||
| rust-toolchain.toml | ||
| SECURITY.md | ||
| setup.py | ||
angr
angr is a platform-agnostic binary analysis framework. It is brought to you by the Computer Security Lab at UC Santa Barbara, SEFCOM at Arizona State University, their associated CTF team, Shellphish, the open source community, and @rhelmot.
Project Links
Homepage: https://angr.io
Project repository: https://github.com/angr/angr
Documentation: https://docs.angr.io
API Documentation: https://docs.angr.io/en/latest/api.html
What is angr?
angr is a suite of Python 3 libraries that let you load a binary and do a lot of cool things to it:
- Disassembly and intermediate-representation lifting
- Program instrumentation
- Symbolic execution
- Control-flow analysis
- Data-dependency analysis
- Value-set analysis (VSA)
- Decompilation
The most common angr operation is loading a binary: p = angr.Project('/bin/bash') If you do this in an enhanced REPL like IPython, you can use tab-autocomplete to browse the top-level-accessible methods and their docstrings.
The short version of "how to install angr" is mkvirtualenv --python=$(which python3) angr && python -m pip install angr.
Example
angr does a lot of binary analysis stuff. To get you started, here's a simple example of using symbolic execution to get a flag in a CTF challenge.
import angr
project = angr.Project("angr-doc/examples/defcamp_r100/r100", auto_load_libs=False)
@project.hook(0x400844)
def print_flag(state):
print("FLAG SHOULD BE:", state.posix.dumps(0))
project.terminate_execution()
project.execute()
Quick Start
- Install Instructions
- Documentation as HTML and sources in the angr Github repository
- Dive right in: top-level-accessible methods
- Examples using angr to solve CTF challenges.
- API Reference
- awesome-angr repo