Run shellcode from Ruby

extconf.rb

require 'mkmf'
create_makefile('shellcode')

sc.rb

require 'shellcode'

"\x48\x31\xd2\x48\xbb\x2f\x2f\x62\x69\x6e\x2f\x73\x68\x48\xc1\xeb\x08\x53\x48\x89\xe7\x50\x57\x48\x89\xe6\xb0\x3b\x0f\x05".exec

# http://shell-storm.org/shellcode/files/shellcode-603.php

shellcode.c

#include "ruby/ruby.h"

#ifdef unix
#include <sys/mman.h>
#endif

VALUE exec_s_m(VALUE self) ;

void Init_shellcode(void) {
    VALUE cString = rb_define_class("String", rb_cObject);
    rb_define_method(cString, "exec", exec_s_m, 0);
}

VALUE exec_s_m(VALUE self) {
#ifdef unix
    char *sc = RSTRING_PTR(self);

    intptr_t p = sc;
    p = p ^ (p & 0xfff);
    
    mprotect(p, 0x1000, PROT_READ | PROT_WRITE | PROT_EXEC);
    (*(void (*)()) sc)();
    return Qtrue;
#else
    return Qfalse;
#endif
}