为了制作病毒文件，我们需要一个ELF文件感染器，用于制造第一个带毒文件。对于ELF文件感染技术，在Silvio Cesare的《UNIX ELF PARASITES AND VIRUS》一文中已经有了一个非常好的分析、描述，在这方面我还没有发现可以对其进行补充的地方，因此在这里我把Silvio Cesare对ELF Infection过程的总结贴出来，以供参考： The final algorithm is using this information is.
* Increase p_shoff by PAGE_SIZE in the ELF header
* Patch the insertion code (parasite) to jump to the entry point
(original)
* Locate the text segment program header
* Modify the entry point of the ELF header to point to the new
code (p_vaddr + p_filesz)
* Increase p_filesz by account for the new code (parasite)
* Increase p_memsz to account for the new code (parasite)
* For each phdr who's segment is after the insertion (text segment)
* increase p_offset by PAGE_SIZE
* For the last shdr in the text segment
* increase sh_len by the parasite length
* For each shdr who's section resides after the insertion
* Increase sh_offset by PAGE_SIZE
* Physically insert the new code (parasite) and pad to PAGE_SIZE, into
the file - text segment p_offset + p_filesz (original)
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