radare2/doc/rapatch.md

RAPATCH

Human friendly text format to apply patches to binary files.

Patch format

Those patches must be written in files and the syntax looks like the following:

^# -> comments
. -> execute command
! -> execute command
OFFSET { code block }
OFFSET "string"
OFFSET 01020304
OFFSET : assembly
+ {code}|"str"|0210|: asm

Example scripts

This script will run the ?e .. command in r2 and then write the string 'Hello' at 0x200 offset

# rapatch example
:?e hello world
0x200 "Hello"

Running rapatches

$ r2 -P rapatch.txt target-program.txt

Or for scripted patching like patch(1):

$ r2 -w -q -P rapatch.txt target-program.txt