将部分添加到ELF文件

Question

I need to be able to add an arbitrary section to an ELF file. I cannot use GPL code in this program, so BFD is out of the question. I can use libelf/gelf to read sections, but the documentation is fairly sparse for these, and I cannot figure out how to add a section. Does anybody know how to do this? I would rather not write my own ELF code.

Answer 1

There's a few (possibly) related answers in this question about ELF file headers . The accepted answer mentioned using objcopy to add sections to an ELF file, and the BSD bintools claims to have a BSD-licensed implementation of objcopy that might suit your needs.

Answer 2

I know this is an old question but i found a working example that helped me to apply it to my project. (In case anyone stumbles upon this question)

taken from Sourceware Mail Archiv

$ echo 'int main() { puts ("Hello world"); }' | gcc -x c - -c -o hello.o

$ echo "this is my special data" >mydata

$ objcopy --add-section .mydata=mydata \
          --set-section-flags .mydata=noload,readonly hello.o hello2.o

$ gcc hello2.o -o hello

$ ./hello
Hello world

$ objdump -sj .mydata hello

Answer 3

The following links could be useful:

• The tutorial " libelf by Example " has a chapter on creating new ELF objects.
• The elftoolchain project has manual pages describing libelf 's API in detail.

Answer 4

看看ELFsh，它现在是ERESI项目的一部分http://www.eresi-project.org/他们有很多文档和很酷的用途。

Answer 5

还没有尝试过（但）我自己，但你可能会看看libelf中的函数elf_newscn