GEF (pronounced ʤɛf - "Jeff") is a set of commands for x86/64, ARM, MIPS, PowerPC and SPARC to assist exploit developers and reverse-engineers when using old school GDB. It provides additional features to GDB using the Python API to assist during the process of dynamic analysis and exploit development. Application developers will also benefit from it, as GEF lifts a great part of regular GDB obscurity, avoiding repeating traditional commands, or bringing out the relevant information from the debugging runtime.
Simply make sure you have GDB 7.7 or higher compiled with Python3 bindings, then:
# via the install script ## using curl $ sh -c "$(curl -fsSL http://gef.blah.cat/sh)" ## using wget $ sh -c "$(wget http://gef.blah.cat/sh -O -)" # or manually $ wget -O ~/.gdbinit-gef.py -q http://gef.blah.cat/py $ echo source ~/.gdbinit-gef.py >> ~/.gdbinit # or alternatively from inside gdb directly $ gdb -q (gdb) pi import urllib.request as u, tempfile as t; g=t.NamedTemporaryFile(suffix='-gef.py'); open(g.name, 'wb+').write(u.urlopen('https://tinyurl.com/gef-master').read()); gdb.execute('source %s' % g.name)
Note: to fetch the latest of GEF (i.e. from the
dev branch), simply replace in the URL to http://gef.blah.cat/dev.
You can immediately see that GEF is correctly installed by launching GDB:
$ gdb -q /path/to/my/bin GEF for linux ready, type `gef' to start, `gef config' to configure 80 commands loaded for GDB 9.1 using Python engine 3.8 gef➤ gef help
Note: As of January 2020, GEF doesn't officially support Python 2 any longer, due to Python 2 becoming officially deprecated.
If you really need GDB+Python2, use
All those channels are bridged together via MatterBridge. Even if you don't see people in one specific channel (say Slack), members on other channels (say IRC) will still receive your questions/remarks so feel free to chat! There's always people around!
A few of
GEF features include:
- One single GDB script
- Entirely OS Agnostic, NO dependencies:
GEFis battery-included and is installable instantly
- Fast limiting the number of dependencies and optimizing code to make the commands as fast as possible
- Provides a great variety of commands to drastically change your experience in GDB.
- Easily extensible to create other commands by providing more comprehensible layout to GDB Python API.
- Full Python3 support (Python2 support was dropped - see
- Built around an architecture abstraction layer, so all commands work in any GDB-supported architecture such as x86-32/64, ARMv5/6/7, AARCH64, SPARC, MIPS, PowerPC, etc.
- Suited for real-life apps debugging, exploit development, just as much as CTF