我们如何使用dyninst来执行特定指令?

问题描述

使用Dyninst API，我们可以执行静态和动态二进制检测.
在静态检测中，我们可以重写二进制文件，并在特定位置注入额外的代码(代码段).
我已经测试了以下代码，以修补二进制代码.但是，此代码将片段插入了感兴趣的函数的输入区，即foo.
如何在特定地址插入代码段?
这是代码(链接到原始代码)

Using Dyninst API, we can perform both static and dynamic binary instrumentation.
In static instrumentation, we can rewrite a binary file and inject an extra code (snippets) at a specific points.
I have tested the following code in order to patch a binary code. However, this code inject the snippets at the entery of the interested function, i.e. foo.
How can we inject a snippets at a specific address?
this is the code (link to original code)

#include <stdio.h>
#include "BPatch.h"
#include "BPatch_addressSpace.h"
#include "BPatch_function.h"
#include "BPatch_binaryEdit.h"
#include "BPatch_point.h"

int main(int argc, const char *argv[]) {

    // Use BPatch_* classes to initialize
    BPatch bpatch;
    BPatch_addressSpace *app = bpatch.openBinary("hello", true);
    bool flag = false;
    flag = app->loadLibrary("liblib.so");

    BPatch_image* image = app->getImage();

    std::vector<BPatch_function*> func;
    image->findFunction("code_to_inject", func);

    std::cout<<"\nFunction is: "<<func[0]->getName()<<std::endl;

    std::vector<BPatch_snippet*> openArgs;
    BPatch_funcCallExpr enter_call(*(func[0]), openArgs);

    func.clear();
    std::vector<BPatch_point *> *points;
    image->findFunction("foo1", func);
    points = func[0]->findPoint(BPatch_entry);

    app->insertSnippet(enter_call, *points);

    BPatch_binaryEdit *appBin = dynamic_cast<BPatch_binaryEdit *>(app);

    appBin->writeFile("newbinary");

    return 0;
}

我尝试过的事情:

我认为我们应该使用BPatch_function并传递一个特定的地址，但是我用字段来修饰修改后的代码.也许我们应该使用Dyninst :: Address.
感谢您的帮助

What I have tried:

I think we should use BPatch_function and pass a specific address, but i field to comiple the modified code. Maybe we should use Dyninst::Address.
Thanks for helps

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