Z3 was successfully installed. ; [ERROR] z3 has to be installed in order to use semantic search

[dmiller423]

Z3 was successfully installed. ; [ERROR] z3 has to be installed in order to use semantic search

[sashs]

Hi, Ropper only shows that message if z3 cannot be imported. Are the z3 python bindings installed? Can you import z3 in the python console?

[dmiller423]

looks like I tried to install the z3 module and it failed, and then built z3 and installed and failed to install python module again... thx

[dmiller423]

Even with it built and modules installed, it blows up when using semantics

`` [ERROR] Please report this error on https://github.com/sashs/ropper [ERROR] Traceback (most recent call last): File "/media/null/TEMP/_RE/FS_dumps/4.03_x86_kernel/ropper/ropper/semantic.py", line 66, in analyse irsb = pyvex.IRSB(bytes(gadget.bytes), gadget.address+thumb, gadget.arch.info, bytes_offset=thumb, num_bytes=len(gadget.bytes), opt_level=0) NameError: name 'pyvex' is not defined

During handling of the above exception, another exception occurred:

Traceback (most recent call last): File "/media/null/TEMP/_RE/FS_dumps/4.03_x86_kernel/ropper/ropper/console.py", line 62, in cmd func(self, text) File "/media/null/TEMP/_RE/FS_dumps/4.03_x86_kernel/ropper/ropper/console.py", line 1079, in do_semantic self.__rs.analyseGadgets(self.currentFile) File "/media/null/TEMP/_RE/FS_dumps/4.03_x86_kernel/ropper/ropper/service.py", line 612, in analyseGadgets g.info = analyser.analyse(g) File "/media/null/TEMP/_RE/FS_dumps/4.03_x86_kernel/ropper/ropper/semantic.py", line 73, in analyse except pyvex.PyVEXError as e: NameError: name 'pyvex' is not defined ``

[sashs]

Did you install pyvex as pointed out in the README as necessary dependendy for semantic search?

[dmiller423]

yes

[sashs]

Could you please check if it is installed correctly?

The error message says NameError: name 'pyvex' is not defined

which should be only the case if it could not be imported.

[dmiller423]

Python 3.10.7 (main, Sep  8 2022, 14:34:29) [GCC 12.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import pyvex
>>> 

[sashs]

Still the same error? Which command do you use to start ropper?

[dmiller423]

something like

./Ropper.py --file ../x86_kernel_4.03.bin.elf --semantic "r13 = r14"

It worked one time when i reinstalled the z3 python module, and then i changed the registers and it just started throwing exceptions

[dmiller423]

This shows I am using the same python interpreter, and that pyvex is not only installed that calling it does work (left out args so it blows up on purpose / simply testing it is indeed available)

null@rygar:/media/null/TEMP/_RE/FS_dumps/4.03_x86_kernel$ python3 ropper/Ropper.py --file ./x86_kernel_4.03.bin.elf --semantic "r13 = r14" [INFO] Load gadgets from cache [LOAD] loading... 100% [LOAD] removing double gadgets... 100% [ERROR] Please report this error on https://github.com/sashs/ropper [ERROR] Traceback (most recent call last): File "/media/null/TEMP/_RE/FS_dumps/4.03_x86_kernel/ropper/ropper/semantic.py", line 66, in analyse irsb = pyvex.IRSB(bytes(gadget.bytes), gadget.address+thumb, gadget.arch.info, bytes_offset=thumb, num_bytes=len(gadget.bytes), opt_level=0) NameError: name 'pyvex' is not defined

During handling of the above exception, another exception occurred:

Traceback (most recent call last): File "/media/null/TEMP/_RE/FS_dumps/4.03_x86_kernel/ropper/ropper/console.py", line 62, in cmd func(self, text) File "/media/null/TEMP/_RE/FS_dumps/4.03_x86_kernel/ropper/ropper/console.py", line 1079, in do_semantic self.__rs.analyseGadgets(self.currentFile) File "/media/null/TEMP/_RE/FS_dumps/4.03_x86_kernel/ropper/ropper/service.py", line 612, in analyseGadgets g.info = analyser.analyse(g) File "/media/null/TEMP/_RE/FS_dumps/4.03_x86_kernel/ropper/ropper/semantic.py", line 73, in analyse except pyvex.PyVEXError as e: NameError: name 'pyvex' is not defined null@rygar:/media/null/TEMP/_RE/FS_dumps/4.03_x86_kernel$ python3

Python 3.10.7 (main, Sep  8 2022, 14:34:29) [GCC 12.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import pyvex
>>> pyvex.IRSB()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: IRSB.__init__() missing 3 required positional arguments: 'data', 'mem_addr', and 'arch'
>>> 

[sashs]

I still think that this is an issue of your environment, because of the name error which says that pyvex is not known.

Could you please execute in your bash /usr/bin/env python

and there try to import pyvex. Afterwards you could try to execute ropper with your python interpreter python Ropper.py

I've just created a docker container, and installed everything (ropper, pyvex, z3) and it works fine.

[dmiller423]

I can import pyvex fine when I do that, but both the git version and the version imported via pip both give the same exception that pyvex is not defined. /shrug

[sashs]

Can you import

import z3
import pyvex
import archinfo

[dmiller423]

null@rygar:/media/null/TEMP/_RE/FS_dumps/4.03_x86_kernel$ /usr/bin/env python
Python 3.10.7 (main, Sep  8 2022, 14:34:29) [GCC 12.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import z3
>>> import pyvex
>>> import archinfo
>>> 

[sashs]

Still same behaviour if you use this python Ropper.py

[sashs]

Which OS do you use?

[dmiller423]

No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 22.10
Release:        22.10
Codename:       kinetic

[sashs]

Have you tried it with python Ropper.py?

Sorry for the inconvenience, but I need to find out what the issue is. I tried it in gentoo and in a docker container with ubuntu 22.04.1 and everything works fine.

I will try it tomorrow on ubuntu 22.10.

[dmiller423]

https://github.com/sashs/Ropper/issues/164#issuecomment-1298887445 ^ using same python for both, and using python-is-python3

[sashs]

I tried it with a fresh docker container with ubuntu 22.10 installed I installed

apt install python-is-python3 z3 python3-pip python3-z3
pip install pyvex
pip install ropper

Afterwards I tried

ropper -f /bin/ls --semantic "rax==rbx"

works without issues.

I assume there is something wrong with your environment

[sashs]

Any update?

[dmiller423]

I don't have time to debug the problem further, so I've just written it off as a non-functional feature. I tested every possible scenario I can think of and I couldn't tell you why it somehow doesn't see a package that's clearly installed and can be imported and used without trouble. There are no alternate environments except one made in pycharm and z3 / pyvex work in that venv as they do at global scope. Git repo and the version installed via pip both do the exact same thing / there is no difference that could be explained away by local conflict in one. I simply don't have any answers for you, but I'm sure the issue will come back up again at some point: they always do.

[sashs]

Ok. Nevertheless, many thanks for your support. Since I cannot reproduce the issue, even on the same operating system and python version, I will close this issue.

[friendlyJLee]

@dmiller423, If you encounter such an error, it's possible that you installed the 'z3' package instead of 'z3-solver', as both packages exist in Python with similar names. To resolve this, check your installed packages using 'pip list'. If 'z3' is installed but not 'z3-solver', first uninstall 'z3' with 'pip uninstall z3', and then install 'z3-solver' using 'pip install z3-solver'.