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#2
wog2011-04-12 23:01
这一楼的内容转自看雪
【背景介绍】:二进制拆弹实验是卡内基-梅隆(CMU)开设的：计算机系统导论(ICS)课程的一道实验题,下面是《深入理解计算机系统》上面对这个实验的文字说明: 二进制炸弹是一个作为目标代码文件提供给学生们的程序。运行时，它提示用户输入6个不同的字符串。如果其中的任何一个不正确，炸弹就会“爆炸”，打印出一条错误信息，并在一个分级(gradin）服务器上记录事件日志。学生们必须通过对程序的反汇编和逆向工程来测定应该是哪6个串，从而解除他们各自炸弹的雷管。该实验教会学生理解汇编语言，并且强制他们学习怎样使用调试器  程序代码：FILE *infile; int main(int argc, char *argv[]) { char *input; /* Note to self: remember to port this bomb to Windows and put a * fantastic GUI on it. */ /* When run with no arguments, the bomb reads its input lines * from standard input. */ if (argc == 1) { infile = stdin; } /* When run with one argument <file>, the bomb reads from <file> * until EOF, and then switches to standard input. Thus, as you * defuse each phase, you can add its defusing string to <file> and * avoid having to retype it. */ else if (argc == 2) { if (!(infile = fopen(argv[1], "r"))) { printf("%s: Error: Couldn't open %s\n", argv[0], argv[1]); exit(8); } } /* You can't call the bomb with more than 1 command line argument. */ else { printf("Usage: %s [<input_file>]\n", argv[0]); exit(8); } /* Do all sorts of secret stuff that makes the bomb harder to defuse. */ initialize_bomb(); printf("Welcome to my fiendish little bomb. You have 6 phases with\n"); printf("which to blow yourself up. Have a nice day!\n"); /* Hmm... Six phases must be more secure than one phase! */ input = read_line(); /* Get input */ phase_1(input); /* Run the phase */ phase_defused(); /* Drat! They figured it out! * Let me know how they did it. */ printf("Phase 1 defused. How about the next one?\n"); /* The second phase is harder. No one will ever figure out * how to defuse this... */ input = read_line(); phase_2(input); phase_defused(); printf("That's number 2. Keep going!\n"); /* I guess this is too easy so far. Some more complex code will * confuse people. */ input = read_line(); phase_3(input); phase_defused(); printf("Halfway there!\n"); /* Oh yeah? Well, how good is your math? Try on this saucy problem! */ input = read_line(); phase_4(input); phase_defused(); printf("So you got that one. Try this one.\n"); /* Round and 'round in memory we go, where we stop, the bomb blows! */ input = read_line(); phase_5(input); phase_defused(); printf("Good work! On to the next...\n"); /* This phase will never be used, since no one will get past the * earlier ones. But just in case, make this one extra hard. */ input = read_line(); phase_6(input); phase_defused(); /* Wow, they got it! But isn't something... missing? Perhaps * something they overlooked? Mua ha ha ha ha! */ return 0; } |
我了个去，硬着头皮看咯
结果看得我头皮都麻了也硬是没搞懂，
然后又找了本操作系统，悲剧再次上演……
再换
计算机组成原理，这个能看懂，不过更喜欢汇编
闲话少说
上正餐：
之所以会学汇编，跟着个贴子也有关
http://bbs.
当初看不懂，觉得好厉害，最近学完了GAS的语法，自然是拿他先练手咯
ps：初学，接受所有批评和意见
ps2：绝对没有提前看答案
ps3：如果后面的拆不出来，太监了，大家也请见谅
PSP：再次感谢看雪，感谢编程论坛
PSP2000:怎么传不了附件啊
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[ 本帖最后由 wog 于 2011-4-13 18:37 编辑 ]
