Bomb Lab: Phase 1

Assembly

0000000000401440 <phase_1>:
b0:
  401440:	48 83 ec 08          	sub    $0x8,%rsp
  401444:	48 8d 35 05 1d 00 00 	lea    0x1d05(%rip),%rsi        # 403150 <_IO_stdin_used+0x150>
  40144b:	e8 43 04 00 00       	callq  401893 <strings_not_equal>
  401450:	85 c0                	test   %eax,%eax
  401452:	74 05                	je     401459 <phase_1+0x19>
  401454:	e8 03 07 00 00       	callq  401b5c <explode_bomb>
b1:
  401459:	48 83 c4 08          	add    $0x8,%rsp
  40145d:	c3                   	retq

翻译为 C

void phase_1() {
b0:
  rsp -= 8;
  rsi = rip + 0x1d05;
  rax = strings_not_equal(rdi, rsi);
  if (rax == 0)  // 32-bit
    goto b1;
  explode_bomb();
b1:
  rsp += 8;
  return;
}

Optimize

void phase_1(char* rdi) {
  char* rsi = 0x403150; // 403150 <_IO_stdin_used+0x150>
  if (strings_not_equal(rdi, rsi)) explode_bomb();
  return;
}

Hack

(gdb) x/s 0x403150
0x403150:       "I am not part of the problem. I am a Republican."

Solution

I am not part of the problem. I am a Republican.