Wrong dynamic library soname parsing
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- Dominant language
- Rust
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Description
Hello everyone,
I wanted to get the soname of a shared library and readelf was able to correctly determine the name,
but goblin wasn't able to do so. It just showed that the library had no soname. So I dug a bit in the elf
file specification and was able to get the correct value. With goblin I could simply call
elf.dynstrtab.get_at(elf.dynamic.unwrap().info.soname) and get the correct result. While implementing
lazy parsing, I encountered that goblin refuses to set a soname if dyninfo.soname is zero. So checking for
0 isn't correct here:
https://github.com/m4b/goblin/blob/b43b93ed2243b75043d6fb1021ad9aec227df1f5/src/elf/mod.rs#L297
I'm not sure how to correctly check if there isn't any soname.
Have a nice day everyone and thanks for the great library!
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start in src/elf/mod.rs around the soname handling referenced in the issue, then compare its zero-value check with the ELF specification and readelf's result. Verify that a valid soname is returned through the dynamic string table while a genuinely absent soname remains absent.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- reverse-engineering
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100