ReassemblerBackend Error
pfsun opened this issue · 10 comments
Hi,
I just install and try patcherex. When I try the example "modifies the binary CADET_00003 so that it prints "HI!" ", if I use backend = DetourBackend, everything compiles and runs well. However, if I use backend = ReassemblerBackend, there will be the following error:
Traceback (most recent call last):
File "test_sun.py", line 38, in <module>
backend.save("/tmp/CADET_00003_mod1")
File "/var/home/psun/fla/angr-rw/patcherex/patcherex/backends/reassembler_backend.py", line 134, in save
raise CompilationError("File: %s Error: %s" % (tmp_file_path,res))
patcherex.errors.CompilationError: File: /tmp/CADET_000032Yp69w.s Error: ('', 'bash: /var/home/psun/.virtualenvs/angr-rw/local/lib/python2.7/site-packages/compilerex/../assemble.sh: No such file or directory\n')
You also need compilerex to automatically compile things.
Also, at the moment, Patcherex does not work with the latest angr on master (after a gigantic merge occurred earlier this morning). I hope we will fix it soon.
Here is compilerex: https://github.com/mechaphish/compilerex
I do install compilerex. It looks the reason is path problem "/var/home/psun/.virtualenvs/angr-rw/local/lib/python2.7/site-packages/compilerex/../assemble.sh". When I install compilerrex, the assemble.sh will not copy to ../site-packages/
It looks like a problem of the setup.py in compilerex. It will be fixed. Thanks for reporting.
For now, please manually copy the script there.
PS: I wish I could move issues across repos!
Now I copy the assemble.sh to this dir. And I also check the $DIR in assemble.sh (You may also fix it). If I don't change it, the error cannot find clang line 29: /var/home/psun/.virtualenvs/angr rw/local/lib/python2.7/site-packages/compilerex/../bin/clang: No such file or directory\n.
After I modify $DIR. There is error for "error: instruction requires: Not 64-bit mode". Do you use Patcherex in 32bit machine or 64bit machine?
raise CompilationError("File: %s Error: %s" % (tmp_file_path,res))
patcherex.errors.CompilationError: File: /tmp/CADET_00003UFltFE.s Error: ('/usr\n/var/home/psun/.virtualenvs/angr-rw/local/lib/python2.7/site-packages/compilerex/..\n/var/home/psun/.virtualenvs/angr-rw/lib/python2.7/site-packages\n', '/tmp/CADET_00003UFltFE.s:11:1: error: instruction requires: Not 64-bit mode\npushal\n^\n/tmp/CADET_00003UFltFE.s:18:1: error: instruction requires: Not 64-bit mode\npopal\n^\n/tmp/CADET_00003UFltFE.s:19:1: error: instruction requires: Not 64-bit mode\nretl\n^\n/tmp/CADET_00003UFltFE.s:29:2: error: instruction requires: Not 64-bit mode\n pushl %ebp\n ^\n/tmp/CADET_00003UFltFE.s:53:2: error: instruction requires: Not 64-bit mode\n calll s
And then I add -m32 flag. The error is like:
raise CompilationError("File: %s Error: %s" % (tmp_file_path,res))
patcherex.errors.CompilationError: File: /tmp/CADET_00003FVjDDf.s Error: ('/usr\n/var/home/psun/.virtualenvs/angr-rw/local/lib/python2.7/site-packages/compilerex/..\n/var/home/psun/.virtualenvs/angr-rw/lib/python2.7/site-packages\n', '/usr/bin/ld.bfd.real: unrecognised emulation mode: cgc_i386\nSupported emulations: elf_x86_64 elf32_x86_64 elf_i386 i386linux elf_l1om elf_k1om i386pep i386pe\nclang: error: linker command failed with exit code 1 (use -v to see invocation)\n')
The test case you are running uses a CGC binary, which uses x86 instructions internally. You'll want to use the CGC-version clang. It supports the emulation mode cgc_i386.
Have you tried it successfully?why I use cgc clang and it also doesn't support the cgc_i386 mode.
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