如何关闭Glibc运行时保护？ [英] How to turn off Glibc run-time protections?

问题描述

我试图了解代码漏洞，并且测试一些我写的简单程序。但是，Glibc在运行时捕获的许多问题（例如Stack-Smashing，Double Free等）。因此，我想能够运行我的程序没有Glibc的运行时检测错误。有没有办法关闭Glibc的检测？ （像编译器标志等）。

I am trying to learn about code vulnerabilities, and am testing some simple programs I wrote. However, many of the issues Glibc catches during runtime (e.g. Stack-Smashing, Double Free, etc.). Thus I would like to be able to run my programs without Glibc's runtime detection errors. Is there a way to turn off Glibc's detection? (like with a compiler flag, etc).

在前面的链接中我看到了如何关闭ASLR和Canaries，但这不是我想要的喜欢做，因为它仍然停止错误像一个Double Free和一些其他堆错误我想尝试（http://stackoverflow.com/questions/2340259/how-to-turn-off-gcc-compiler-optimization-使能缓冲器溢出）。

I saw in a previous link it is described how to turn off ASLR and Canaries, but this is not what I'd like to do, since it still stops errors like a Double Free and some other heap errors I want to try out (http://stackoverflow.com/questions/2340259/how-to-turn-off-gcc-compiler-optimization-to-enable-buffer-overflow).

我也知道你可以使用-w标志关闭编译时警告，但这似乎不是我想要的。我试过阅读GCC标志和查找Glibc的信息，但我还没有到任何地方。因此，我非常感谢任何帮助。感谢。

I also know you can turn off compile-time warnings with the -w flags but that doesn't seem to be what I want either. I've tried reading over the GCC flags and looking up information about Glibc, but I haven't gotten anywhere yet. Thus I would greatly appreciate any help. Thanks.

推荐答案

检查malloc（3）的手册页以了解MALLOC_CHECK_环境变量的用法。使用这个，你可以关闭中止这些双重的自由错误和不能玩的东西。

Check the man page for malloc(3) for usage of the MALLOC_CHECK_ environment variable. Using this, you can turn off 'aborts' for those double free errors and whatnot to play with things.

man malloc

所以如果你的程序被称为'badfree'，你可以设置MALLOC_CHECK_命令，或只是设置它每次执行badfree。

So if your program was called 'badfree', you can either set MALLOC_CHECK_ (note trailing underscore) with an export command, or just set it every execution of badfree.

export MALLOC_CHECK_=0
./badfree

- 或 -

MALLOC_CHECK_=0 ./badfree

记住如果你使用第一个方法，对于在shell中运行的任何程序。

Just remember if you use the first method, it's set for ANY program you run in that shell.

malloc（3）手册页中的MALLOC_CHECK_的设置是：

Settings for MALLOC_CHECK_ from the malloc(3) man page are:

MALLOC_CHECK_ =
 0  Silently ignore any issues
 1  Send error message to stderr
 2  abort() is called immediately, killing your program.
 3  Do both '1' and '2' (MALLOC_CHECK_ is a bitfield)

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