Does any one use python-sgx to develop python app with SGX?

[TaihuLight]

I build and test python-sgx https://github.com/adombeck/python-sgx , but there are many problems described in https://github.com/adombeck/python-sgx/issues/2
Could you help me?

[tarikova]

I am also trying to make it work but not much luck making basic functions such as seal work inside graphene's SGX enclaves :(

[donporter]

Can you share a more specific output or set of symptoms? Make sure to enable debugging (build with DEBUG=1) and set the debug output in the manifest to inline.

[tarikova]

Thanks for your suggestions Professor Porter. I will.

The frustrating thing is right now I get no symptoms. The programs exits without any output. In fact, I put a debug print statement inside the python function. That does print outputs when I called the _sealing_swing.seal function from the generated _sealing_swig.so file, which is supposed to run the underlying sgx_seal_data function from sgx_tseal.h

[tarikova]

@donporter I compiled graphene with DEBUG=1 and then tried running the swig sealing program by @adombeck
I get an assertion error in shim_namei.c--more specifically assert(start->state & DENTRY_ISDIRECTORY); on line 97. Unclear if it has anything to do with the library.

[donporter]

Interesting. Can you share any more details about how to reproduce this error?

[mkow]

We (ITL) have a working fix for exactly this issue, we'll send a PR fixing this next week (hopefully). The problem is caused by a few bugs in reference counting, leading to use-after-free on one of dentry structures.