在执行内存的机器code [英] Executing machine code in memory

问题描述

我试图找出如何执行存储在内存的机器code。

I'm trying to figure out how to execute machine code stored in memory.

我有以下的code：

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char* argv[])
{
    FILE* f = fopen(argv[1], "rb");

    fseek(f, 0, SEEK_END);
    unsigned int len = ftell(f);
    fseek(f, 0, SEEK_SET);

    char* bin = (char*)malloc(len);
    fread(bin, 1, len, f);

    fclose(f);

    return ((int (*)(int, char *)) bin)(argc-1, argv[1]);
}

上面的code编译海合会很好，但是当我尝试从这样的命令行执行程序：

The code above compiles fine in GCC, but when I try and execute the program from the command line like this:

./my_prog /bin/echo hello

程序段错误。我已经想通了，问题是最后一行，因为注释掉它停止了段错误。

The program segfaults. I've figured out the problem is on the last line, as commenting it out stops the segfault.

我不认为我做得很对，因为我仍然得到我的头周围的函数指针。

I don't think I'm doing it quite right, as I'm still getting my head around function pointers.

是问题的一个错误的演员，还是其他什么东西？

Is the problem a faulty cast, or something else?

推荐答案

在我看来，你在加载ELF映像，然后试图直接跳转至ELF头？ <一href=\"http://en.wikipedia.org/wiki/Executable_and_Linkable_Format\">http://en.wikipedia.org/wiki/Executable_and_Linkable_Format

It seems to me you're loading an ELF image and then trying to jump straight into the ELF header? http://en.wikipedia.org/wiki/Executable_and_Linkable_Format

如果你想执行另一个二进制，你为什么不使用的过程中创造功能的任何一个平台，你正在使用？

If you're trying to execute another binary, why don't you use the process creation functions for whichever platform you're using?

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