ELF格式操作 [英] ELF format manipulation

问题描述

我有一个要求，我想将 index 与文件(某种格式)相关联.我想知道我是否可以进行任何ELF操作，并且仍然确保保持一致性，因此该文件在Linux上可以正常工作.这里的想法是创建一种文件格式，该文件格式可以由某个API(自定义)查询以获取索引.

I have a requirement where I want to associate an index with a file(in a certain format). I was wondering if I can do any ELF manipulation and still ensure that, consistency is maintained so, the file works fine on linux. The idea here is to create a file format which can be queried by a certain API[self-defined] to get me the index.

a)是否可以修改ELF标头以存储索引(如上所述).

a)is it possible to modify the ELF header to store the index(mentioned above).

b)如果是，请问该如何处理?

b)if yes, what is the process?

推荐答案

您可以将具有所需数据的新ELF节添加到现有可执行文件中.例如

You can add a new ELF section with whatever data you want to an existing executable. e.g.

$ echo 42 > /tmp/index
$ objcopy --add-section .my_index=/tmp/index /bin/ls myls
$ objdump -s myls | tail
.
.
. 

Contents of section .my_index:
 0000 34320a                               42.    

然后您可以使用libelf找出从何处读取此数据.

You can then figure out where to read this data from using libelf.

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