Vector35 / Vector35/binaryninja-api
`__chkstk` screws up stack pointer analysis
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Component: Core
Effort: Medium
Impact: Low
- Dominant language
- C++
- Stars
- 1.3k
- Forks
- 298
- Avg merge
- 5d 5h
- Merged PRs (30d)
- 19
Description
In the screenshot, we see that rsp becomes a variable due to the __chkstk call:
If we patch and remove the code the stack variables are correctly analyzed:
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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 by reproducing the report with the attached BEDaisy.sys.zip and inspect the stack-pointer analysis around the __chkstk call. Compare the result with the patched version shown in the screenshots; done means rsp is analyzed correctly and stack variables are recovered without removing the call.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- reverse-engineering
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100