If ESIL emulation of an insn is incorrect, how to hotfix?

[jstaursky]

This came up at work the other day, I was emulating some shellcode and noticed an instruction did not compute correctly. I don't recall the exact instruction and it might be fixed on the current version, but is there a way to hotfix esil instructions? Its not very easy to upgrade r2 in my workplace...

[trufae]

There are different ways:

• anal hints . Replace any instruction esil with (ahe command)
• Anal pins, execute a script when pc reaches a specific address
• create an arch plugin with the fixed esil and load it when you need it

Ideally updating r2 should be the way to go

[jstaursky]

Thanks! Could you give an example of doing it via anal hints?