openstreetmap / openstreetmap/mod_tile
Segfault on X-forwarded-for
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- Dominant language
- C++
- Stars
- 318
- Forks
- 199
- PR merge metrics
- No merged PRs in 30d
Description
When enabling ModTileEnableTileThrottlingXForward 1 or 2, mod_tile segfault.
No problem with ModTileEnableTileThrottlingXForward 0
Exemple with request X-forwarded-for header : 127.0.0.1
Apache error.log
[Fri Nov 08 21:00:57.764068 2019] [core:notice] [pid 6250:tid 139682593230912] AH00052: child pid 6253 exit signal Segmentation fault (11)
Contributor guide
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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 crash in mod_tile with ModTileEnableTileThrottlingXForward set to 1 or 2 and an X-forwarded-for header such as 127.0.0.1. Trace the Apache request-handling path for this directive and compare it with value 0. Done means the request no longer segfaults and throttling handles the forwarded address correctly.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- apache, cpp
- Domain
- backend, networking
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 42/100