使用内存消毒器与libstdc ++ [英] Using memory sanitizer with libstdc++

问题描述

我希望使用clang中的 -fsanitize = memory 标志来分析以下程序：

I wish to use the -fsanitize=memory flag in clang to analyse a program like the following:

#include <string>
#include <iostream>
#include <fstream>
using namespace std;

void writeToFile(){
    ofstream o;
    o.open("dum");
    o<<"test"<<endl; //The error is here.
                     //It does not matter if the file is opened this way,
                     //or with o("dum");
    o.close();
}
int main(){
    writeToFile();
}

据我所知，这个程序是正确的， code> clang ++ san.cpp -fsanitize = memory 它在运行时失败：

As far as I know, this program is correct, but when I use clang++ san.cpp -fsanitize=memory It fails (at runtime) with:

UMR in __interceptor_write at offset 0 inside [0x64800000e000, +5)  
==9685== WARNING: MemorySanitizer: use-of-uninitialized-value  
    #0 0x7f48d0899ae5 (/usr/lib/x86_64-linux-gnu/libstdc++.so.6+0x7bae5)  
    #1 0x7f48d08d1787 (/usr/lib/x86_64-linux-gnu/libstdc++.so.6+0xb3787)  
    #2 0x7f48d08d21e2 (/usr/lib/x86_64-linux-gnu/libstdc++.so.6+0xb41e2)  
    #3 0x7f48d08cfd1e (/usr/lib/x86_64-linux-gnu/libstdc++.so.6+0xb1d1e)  
    #4 0x7f48d08b1f2d (/usr/lib/x86_64-linux-gnu/libstdc++.so.6+0x93f2d)  
    #5 0x7f48d16d60f5 in writeToFile() /home/daniel/programming/test/santest.cpp:10  
    #6 0x7f48d16d61f4 in main /home/daniel/programming/test/santest.cpp:15  
    #7 0x7f48d0261de4 (/lib/x86_64-linux-gnu/libc.so.6+0x21de4)  
    #8 0x7f48d16d5e42 in _start (/home/daniel/programming/test/a.out+0x61e42)  

SUMMARY: MemorySanitizer: use-of-uninitialized-value ??:0 ??

如何使这项功能正常运作？

How can I make this work properly?

Clang版本3.5，stdlibc ++版本6

Clang version 3.5, stdlibc++ version 6

推荐答案

代码很好，但是很多类似的错误是由以下原因引起的：需要clang的内存消毒器工具：

The code is fine, of course but many similar errors are cause by the following requirement of clang's memory sanitizer tool:

MemorySanitizer（没有动态组件）要求整个程序
代码包括库，除了libc / libm / libpthread，在某种程度上）。

MemorySanitizer (without a dynamic component) requires that the entire program code including libraries, (except libc/libm/libpthread, to some extent), is instrumented.

从这里

使用libstdc ++的cplusplus运行时是unistrumented并导致错误。你将不得不遵循一个有点费力的过程，如链接所述重建一个仪器化的libstdc ++或切换到libc ++（易于ish）

The cplusplus runtime you are using libstdc++ is unistrumented and causes errors. You will unfortunately have to follow a somewhat fiddly process as described at that link to rebuild an instrumented libstdc++ or switch to libc++ (easier-ish)

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