llse does not work

[jiak94]

The error is std::regex_error, it seems like the regular expression in main.c is incorrect.

[jiak94]

After compiling with g++6.3, llse works, but it gives me a segmentation fault

[Ch3nYe]

The same Segmentation fault (core dumped) occurred to my llse. It crush in in symengine.cpp line64, and the gdb shows:

(gdb) r loop1000.txt loop1001.txt
Starting program: /root/CryptoHunt/llse loop1000.txt loop1001.txt
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
0x000055555558d0a4 in Value::isSymbol (this=0x0) at symengine.cpp:64
64           if (this->valty == SYMBOL)
(gdb) exit

[Ch3nYe]

I have found the reason cause this issue.
In symengine.cpp, ctx is defined in SEEngine Class.

ctx = { {"eax", NULL}, {"ebx", NULL}, {"ecx", NULL}, {"edx", NULL},
        {"esi", NULL}, {"edi", NULL}, {"esp", NULL}, {"ebp", NULL}
      };

when the right value access the ctx with the key dose not exist, the C++ make a defualt value with the key.
Unfortunately, when parse instructions like mov cv, 0x4, the key 'cx' is used for accessing ctx, the value is create by C++ with default 0x0, but it should be a point for struct Value. In this case, the code try to access a Value variable in 0x0, it cased the a segmentation fault.

In other word, this code is not suitable for real world instruction code, any register not in the ctx defination is unexpected. You could never run the code with binary in the wild, since the other components mentioned in their paper are not released.