CLE crashes when trying to load FASM-compiled executables

[ViktorMKa]

>>> b=angr.Project('./garbage_bytes2.EXE')
ERROR   | 2015-12-15 16:57:25,594 | cle.loader | Loading error when loading /home/viktor/tool/angrtest/garbage_bytes2.EXE with backend Blob
Traceback (most recent call last): File "/home/viktor/.virtualenvs/angr3/local/lib/python2.7/site-packages/cle/loader.py", line 230, in load_object loaded = backend(path,compatible_with=compatible_with, filetype=filetype, is_main_bin=is_main_bin, **options)
  File "/home/viktor/.virtualenvs/angr3/local/lib/python2.7/site-packages/cle/backends/blob.py", line 25, in __init__raise CLEError("Must specify custom_arch when loading blob!")
CLEError: Must specify custom_arch when loading blob!
Traceback (most recent call last):    
  File "<stdin>", line 1, in <module>
  File "/home/viktor/.virtualenvs/angr3/local/lib/python2.7/site-packages/angr/project.py", line 98, in __init__
self.loader = cle.Loader(self.filename, **load_options)
File "/home/viktor/.virtualenvs/angr3/local/lib/python2.7/site-packages/cle/loader.py", line 88, in __init__
self._load_main_binary()
File "/home/viktor/.virtualenvs/angr3/local/lib/python2.7/site-packages/cle/loader.py", line 139, in _load_main_binary
self.main_bin = self.load_object(self._main_binary_path, self._main_opts, is_main_bin=True)
File "/home/viktor/.virtualenvs/angr3/local/lib/python2.7/site-packages/cle/loader.py", line 236, in load_object
raise CLEError("All backends failed loading %s!" % path)
cle.errors.CLEError: All backends failed loading /home/viktor/tools/angrtest/garbage_bytes2.EXE!

Not sure if this is my error or whether it is on angr/CLE. I made a fresh virtualenv to try and fix this. Didn't help.

garbage_bytes.txt

[rhelmot]

Could you provide the compiled binary? What's happening is that CLE can't tell what kind of file it is (all its magic number checks fail), and also the blob backend fails because you didn't specify the architecture it's for, so CLE can't load it.

[ViktorMKa]

garbage_bytes2.EXE.zip
This is the file in question. I'm not sure about specifying the architecture, i only dabbled in assembler to produce some small testcase files.

[zardus]

rhelmot is the only one with a chance at solving this :-)

[rhelmot]

Alright so the answer here is that this is a MS-DOS executable, which is not currently supported by CLE. It wouldn't be too hard to write a loader for this format, since there's no metadata and it's basically a flat binary minus the header if I'm not mistaken.

[ltfish]

Do we support running 16-bit programs (or is that part open sourced)?

[rhelmot]

Ronny's stuff is in fact released, so there shouldn't be an issue here.

[ltfish]

Nice! I guess we are still lacking simulation for MS-DOS environments, but that's not a big issue.

[ViktorMKa]

It is honestly not a big priority to me. I've switched over to gcc for my assembler needs, which works just dandy since it produces ELF files. Still thank you for the explanations you provided.

[trietptm]

It would be nice to have angr CLE support for MS-DOS executable.