openresty / openresty/lua-nginx-module
May trigger coredump when ngx_http_set_builtin_multi_header and subrequest？
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- Dominant language
- C
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Description
1 ngx_http_set_builtin_multi_header will destroy and reinit multi header array in the main request, but the header address is reserved in header variable of the subrequest
2 if ngx_array_destroy really release the memory and reuse by other logic， then subrequest access the headers may cause error
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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 tracing ngx_http_set_builtin_multi_header in the main request and how the subrequest retains the header address. Verify whether destroying and reinitializing the multi-header array can leave the subrequest accessing released memory; done means confirming the failure and documenting or testing the required safe behavior.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- c
- Domain
- backend
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100