Invalid instructions when reading from a rust x64 binary

[RadonCoding]

I'm reading the .text section of a rust x64 binary and getting the following invalid instructions.

Here is my code https://paste.ofcode.org/6rTPNCdgRzRZN6VdVvfk98

41 FE FF
FE FB
DD FC FF
FF EE
82 FD
C6 FD
FF 38
8D FE
FF ED
4F FF FF
C5 FD FF FF
82 FE
60 FD
FF DE
8F FF FF FF
FF DA
F0 FD
FF D8
FF EF
44 FF FF
FF BD
FF B8
EA FC
27 FC
3F FC
17 FD
2F FD
8F FD FF FF
07 FE
1F FE
37 FE
4F FE FF
FF 3F
8C FF
FF B9
FF FB
0E FD
FF 7B
FF 3B
CE FD
FF DB
DB FD
C5 FC FF FF
67 FE FF
C7 FA
D6 FA
FF FC
FF DF
FE FE
FF 7E
FF BC
FF 7C
FE FF
8E FF
FF FF

[RadonCoding]

My goal is to decode the instructions then modify them and encode

[wtfsck]

Compilers add data to the code section too so you can't just assume everything is valid code.

You have to figure out which bytes are code and which aren't. Start at some known locations that you know are code, then disassemble that code, follow branches etc, to find new code (see Instruction::flow_control() method). Whatever hasn't been decoded could still be code but it's e.g. referenced from some data. Or it's just data.

[RadonCoding]

thanks