Vector35 / Vector35/binaryninja-api
Automatically infer the size of the stucture based on outlined memcpy/memset
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- Dominant language
- C++
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- Merged PRs (30d)
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Description
We already infer the size of a structure if it comes from a known memory allocation routine, e.g., malloc. The same thing can be done when a buffer is referenced in the following code pattern:
__builtin_memset(s: &var_58_125, c: 0xff, n: 0x38)
We can automatically set the size of the struct to 0x38 in this case
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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 locating the existing structure-size inference for known allocation routines and the handling of outlined __builtin_memcpy/__builtin_memset calls. Compare the shown memset pattern with that path. Done means a buffer referenced by the pattern infers the structure size from n, such as 0x38 in the example.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- reverse-engineering
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100