在Windows批处理文件结尾简单插入符号（^）消耗的所有内存 [英] Simple caret (^) at end of Windows batch file consumes all memory

问题描述

在相对较短的时间这个简单的批处理文件占用的Windows 7（x64）的所有可用内存。这是怎么回事？并可以采取什么样的precautions抵御反对呢？

This simple batch file in relatively short order consumes all available memory on Windows 7 (x64). What's going on? and what precautions can be taken to ward against it?

any-invalid-command-you-like-here ^

显然需要preconditions展示效果：

Apparently necessary preconditions to exhibit the effect:

• 插入符号 ^ 是文件中的最后一件事，脚本不换行终止


• 插入符号是由至少2个空格或字符，例如pceded $ P $如果下面再present空间内存泄漏不会被触发点 ^ ，而这一次将 .. ^ （只是慢）

• the caret ^ is the very last thing in the file, and the script is not terminated with a newline
• the caret is preceded by at least 2 spaces or characters, e.g. if the dots in the following represent spaces the memory leak will not be triggered .^, while this one will ..^ (just slowly)

在此的的Process Explorer 的屏幕截图，该脚本已运行约30秒，消耗2.9GB，并以稳定的速度仍在攀升：

In this Process Explorer screen shot, the script had been running about 30 seconds, consumed 2.9GB, and was still climbing at a steady rate:

如果你打算用这个实验，确保您可以在关闭窗口[X]控制得到或有一个任务管理器或Process Explorer中解雇了，并准备为<大骨节病>按Ctrl-C <大骨节病>用CTRL-Break ，的Alt-F4 没有任何效果

If you're going to experiment with this, make sure you can get at the Close Window [X] control or have a Task Manager or Process Explorer fired up and ready as Ctrl-C, Ctrl-Break, Alt-F4 have no effect.

这将会出现多个插入符会导致内存使用更快地斜坡上升。我第一次遇到这种没有足够的可用内存为1或2分钟做简单的事情，像<大骨节病>使用Alt-Tab 甚至三指敬礼<大骨节病>按Ctrl-Alt-Del组合是无效的。我只好硬实力关闭机器。

It appears multiple carets will cause the memory usage to ramp up much more quickly. The first time I encountered this there wasn't enough memory available in 1 or 2 minutes to do simple things like Alt-Tab and even the 3 finger salute Ctrl-Alt-Del was ineffective. I had to hard power off the machine.

推荐答案

这样做的原因（从我的理解）是由于CMD间preTER寻找一个字符逃脱因为 ^ 是批处理转义字符。而不是正确识别在这种情况下文件 EOF 结束后，CMD只是不断循环和初始化的东西，而寻找逃跑的字符。

Thoughts

The cause of this (from my understanding) is due to the cmd interpreter looking for a character to escape since the ^ is the batch escape character. Instead of properly identifying the end of file eof in this scenario, cmd just keeps looping and initializing something while looking for the character to escape.

与 CC ^^^ （用于加快泄漏多个克拉）。

Reproduced on Windows 8 Pro (64) with cc^^^ (Multiple carats used to speed up the leak).

CC ^ 无限循环和泄漏速度很慢。

cc^ infinite loop and leaks very slowly.

CC ^^ 崩溃与正常无效命令错误。

cc^^ crashes with normal invalid command error.

CC ^^^ 无限循环和泄漏速度更快。

cc^^^ infinite loop and leaks faster.

CC ^ 无限循环和泄漏速度很慢。

cc ^ infinite loop and leaks very slowly.

CC ^^ 崩溃与正常无效命令错误。

cc ^^ crashes with normal invalid command error.

CC ^^^ 无限循环和泄漏速度更快。

cc ^^^ infinite loop and leaks faster.

CC^ 崩溃与正常无效命令错误。

cc"^ crashes with normal invalid command error.

CC^^ 崩溃与正常无效命令错误。

cc"^^ crashes with normal invalid command error.

CC^^^ 崩溃与正常无效命令错误。

cc"^^^ crashes with normal invalid command error.

• 只有无限循环和泄漏时，克拉 ^ 的字面意义（报价之外）。当报价添加脚本崩溃与标准的命令无效错误。


• 只有无限循环，当批处理文件是EN codeD为 UTF-8 或 ASCII 泄漏。当 UTF-16 ，脚本崩溃与标准的命令无效错误。


• 必须是奇数克拉为无法逃脱最后克拉。

• Only infinite loop and leaks when carats ^ are used literally (outside of quotations). When quotation added the script crashes with standard invalid command error.
• Only infinite loop and leaks when batch file is encoded as UTF-8 or ASCII. When UTF-16, the script crashes with standard invalid command error.
• Must be an odd number of carats as to not escape the last carat.

• 确保没有批处理脚本以克拉 ^ （0x5E）或至少奇数克拉的结束。


• 或EN code他们UTF-16。

• Make sure no batch scripts end with a carat ^ (0x5E) or at least an odd number of carats.
• Or encode them in UTF-16.

这篇关于在Windows批处理文件结尾简单插入符号（^）消耗的所有内存的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！