When Things Go Wrong¶
Turn on debugging output to get more error information:
python -d pyarmor.py ... PYTHONDEBUG=y pyarmor ...
In the following cases, obfuscated scripts will crash
- Running obfuscated script by the debug version Python
- Obfuscating scripts by Python 2.6 but running the obfuscated scripts by Python 2.7
After PyArmor 5.5.0, some machines may be crashed because of advanced mode. A quick workaround is to diable advanced mode by editing the file pytransform.py which locates in the installed path of pyarmor , in the function _load_library, uncomment about line 202. The final code looks like this:
# Disable advanced mode if required m.set_option(5, c_char_p(1))
Could not find _pytransform¶
Generally, the dynamic library _pytransform is in the same path of obfuscated scripts. It may be:
- _pytransform.so in Linux
- _pytransform.dll in Windows
- _pytransform.dylib in MacOS
First check whether the file exists. If it exists:
Check the permissions of dynamic library
If there is no execute permissions in Windows, it will complain: [Error 5] Access is denied
Check whether ctypes could load _pytransform:
from pytransform import _load_library m = _load_library(path='/path/to/dist')
Try to set the runtime path in the Bootstrap Code of entry script:
from pytransform import pyarmor_runtime pyarmor_runtime('/path/to/dist')
Still doesn’t work, report an issue
The license.lic generated doesn’t work¶
The key is that the capsule used to obfuscate scripts must be same as the capsule used to generate licenses.
If obfuscate scripts by command pyarmor obfuscate, Global Capsule is used implicitly. If obfuscate scripts by command pyarmor build, the project capsule is used.
When generating new licenses for obfuscated scripts, if run command pyarmor licenses in project path, the project capsule is used implicitly, otherwise Global Capsule.
The Global Capsule will be changed if the trial license file of PyArmor is replaced with normal one, or it’s deleted occasionally (which will be generated implicitly as running command pyarmor obfuscate next time).
In any cases, generating new license file with the different capsule will not work for the obfuscated scripts before. If the old capsule is gone, one solution is to obfuscate these scripts by the new capsule again.
NameError: name ‘__pyarmor__’ is not defined¶
No Bootstrap Code are executed before importing obfuscated scripts.
When creating new process by Popen or Process in mod subprocess or multiprocessing, to be sure that Bootstrap Code will be called before importing any obfuscated code in sub-process. Otherwise it will raise this exception.
Marshal loads failed when running xxx.py¶
- Check whether the version of Python to run obfuscated scripts is same as the version of Python to obfuscate script
- Check whether the capsule is generated based on current license of PyArmor. Try to move global capsule ~/.pyarmor_capsule.zip to any other path, then obfuscate scripts again.
- Be sure the capsule used to generated the license file is same as the capsule used to obfuscate the scripts. The filename of the capsule will be shown in the console when the command is running.
_pytransform can not be loaded twice¶
When the function pyarmor_runtime is called twice, it will complaint _pytransform can not be loaded twice
For example, if an obfuscated module includes the following lines:
from pytransform import pyarmor_runtime pyarmor_runtime() __pyarmor__(....)
When importing this module from entry script, it will report this error. The first 2 lines should be in the entry script only, not in the other module.
This limitation is introduced from v5.1, to disable this check, just edit pytransform.py and comment these lines in function pyarmor_runtime:
if _pytransform is not None: raise PytransformError('_pytransform can not be loaded twice')
This limitation has been removed from v5.3.5.
Check restrict mode failed¶
Use obfuscated scripts in wrong way, by default all the obfuscated scripts can’t be changed any more.
Besides packing the obfuscated scripts will report this error either. Do not pack the obfuscated scripts, but pack the plain scripts directly.
For more information, refer to Restrict Mode
Protection Fault: unexpected xxx¶
Use obfuscated scripts in wrong way, by default, all the runtime files can’t be changed any more. Do not touch the following files
For more information, refer to Special Handling of Entry Script
Warning: code object xxxx isn’t wrapped¶
It means this function isn’t been obfuscated, because it includes some special instructions.
For example, there is 2-bytes instruction JMP 255, after the code object is obfuscated, the operand is increased to 267, and the instructions will be changed to:
EXTEND 1 JMP 11
In this case, it’s complex to obfuscate the code object with wrap mode. So the code object is left as it’s, but all the other code objects still are obfuscated.
In later version, it will be obfuscated with non wrap mode.
In current version add some unused code in this function so that the operand isn’t the critical value may avoid this warning.
Check license failed: Invalid input packet.¶
If print this error as running the obfuscated scripts, check if there is any of license.lic or pytransform.key in the current path. To be sure they’re generated for the obfuscated scripts. If not, rename them or move them to other path.
Because the obfuscated scripts will first search the current path, then search the path of runtime module pytransform.py to find the file license.lic and pytransform.key. If they’re not generated for the obfuscated script, this error will be reported.
‘XXX’ codec can’t decode byte 0xXX¶
Add the exact source encode at the begin of the script. For example:
# -*- coding: utf-8 -*-
/lib64/libc.so.6: version ‘GLIBC_2.14’ not found¶
In some machines there is no GLIBC_2.14, it will raise this exception.
One solution is patching _pytransform.so by the following way.
First check version information:
readelf -V /path/to/_pytransform.so ... Version needs section '.gnu.version_r' contains 2 entries: Addr: 0x00000000000056e8 Offset: 0x0056e8 Link: 4 (.dynstr) 000000: Version: 1 File: libdl.so.2 Cnt: 1 0x0010: Name: GLIBC_2.2.5 Flags: none Version: 7 0x0020: Version: 1 File: libc.so.6 Cnt: 6 0x0030: Name: GLIBC_2.7 Flags: none Version: 8 0x0040: Name: GLIBC_2.14 Flags: none Version: 6 0x0050: Name: GLIBC_2.4 Flags: none Version: 5 0x0060: Name: GLIBC_2.3.4 Flags: none Version: 4 0x0070: Name: GLIBC_2.2.5 Flags: none Version: 3 0x0080: Name: GLIBC_2.3 Flags: none Version: 2
Then replace the entry of GLIBC_2.14 with GLIBC_2.2.5:
- Copy 4 bytes at 0x56e8+0x10=0x56f8 to 0x56e8+0x40=0x5728
- Copy 4 bytes at 0x56e8+0x18=0x5700 to 0x56e8+0x48=0x5730
Here are sample commands:
xxd -s 0x56f8 -l 4 _pytransform.so | sed "s/56f8/5728/" | xxd -r - _pytransform.so xxd -s 0x5700 -l 4 _pytransform.so | sed "s/5700/5730/" | xxd -r - _pytransform.so