mmap() shellcode

// example to use mmap() to exec shellcode
//credits: s3my0n
#include <stdio.h>
#include <sys/mman.h>
#include <string.h>
#include <stdlib.h>

int (*sc)();
char shellcode[] =
"\x31\xc0"              // xor    %eax,%eax
"\xb0\x04"              // mov    $0x4,%al
"\x31\xdb"              // xor    %ebx,%ebx
"\x53"                  // push   %ebx
"\x43"                  // inc    %ebx
"\x6a\x6f"              // push   $0x6f
"\x68\x4d\x75\x6e\x64"  // push   $0x646e754d
"\x68\x41\x6c\x6f\x20"  // push   $0x206f6c41
"\x89\xe1"              // mov    %esp,%ecx
"\x31\xd2"              // xor    %edx,%edx
"\xb2\x0a"              // mov    $0xa,%dl
"\xcd\x80"              // int    $0x80
"\x31\xc0"              // xor    %eax,%eax
"\x31\xdb"              // xor    %ebx,%ebx
"\x40"                  // inc    %eax
"\xcd\x80"              // int    $0x80
;

int main(int argc, char **argv) {

    void *ptr = mmap(0, sizeof(shellcode),PROT_EXEC | PROT_WRITE | PROT_READ, MAP_ANON | MAP_PRIVATE, -1, 0);

    if(ptr == MAP_FAILED)
    {
     perror("mmap");
     exit(-1);
    }

    memcpy(ptr, shellcode, sizeof(shellcode));
    sc = ptr;

    sc();

    return 0;
}