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      "body": "在Linux的shell脚本中，流传着一个很有意思，当然也是相当危险的脚本段，俗称Fork炸弹(Fork Bomb)。如下：\n```shell\n:(){ :|:& };:\n```\nFork炸弹会以极快的速度创建大量的进程（进程数以指数式增长），以此消耗系统分配给予的进程可用空间，使进程表饱和。进程表饱和后，就无法运行新程序，除非终止进程表中的某一个进程；但被终止的进程，又会立刻被Fork炸弹探测到并被占用，导致仍然无法运行新的程序。Fork炸弹生成的子程序在消耗进程表空间的同时，也会占用CPU和内存，从而导致系统与现有进程运行速度放缓，响应时间也随之大幅增加，以致于无法完成正常的任务，从而使系统的正常运作受到严重影响。那么，这个由13个字符（包括两个空格字符）组成的所谓Fork炸弹，为何会有如此大的威力呢？\n\n我们来看看这几个字符都干了些什么？\n```shell\n:() # 定义函数，函数名为\":\"，不接受参数\n{ # 函数体开始标识\n: # 调用函数\":\"，即调用自身。可见是一种递归调用。\n| # 用管线(pipe)将结果输出至 ... (由于有管线操作，因此会fork一个新的进程处理)\n: # 在新的进程中的调用函数\":\"。\":|:\"表示每次调用函数\":\"，都会产生两份拷贝\n& # 调用间脱钩，以使最初的\":\"函数被关闭后，其所调用的两个\":\"函数还能继续执行\n} # 函数体结束标识\n; # \":\"函数定义结束后将要进行的操作 ...\n: # 调用\":\"函数，即引爆fork炸弹\n```\n这么一解释，发现还真是那么可怕！好在Fork炸弹本身并没有传染性，只要重启下系统也就恢复了。\n\n那么，我们有没有可能防范Fork炸弹的攻击呢？答案是显然的。Fork炸弹的攻击方式是不断占用进程数来瘫痪系统，那么，如果我们能够限制单个用户的进程数创建上限，就不至于被Fork炸弹瘫痪了。在Linux系统上，可以通过```ulimit```这个指令来实现。例如，\n```\n$ ulimit 200\n```\n表示为当前用户创建200个进程上限。",
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