README.md

GoPatch

Tool to easily patch binary files.

Build

To build the tool:

$ go build main.go
$ strip main
$ mv main /usr/bin/gopatch

Usage

To patch a binary:

$ gopatch <binary> <patchfile>

Patchfile

A patchfile should follow the below syntax:

1 <address>:
2 0x<bytes>

Example:

1 0x12345678:
2 0x5058
3 0xe9
4
5 0x23456789:
6 0x45

This patches will happen at specified binary addresses, and the bytes will be written in order.

Example

Here is an example of gopatch being used:

patch.txt

1 0x0:
2 0x67
3 0x6869

$ xxd binary
00000000: 6162 630a 6465 660a                      abc.def.

$ gopatch binary patch.txt

$ xxd binary
00000000: 6768 690a 6465 660a                      ghi.def.