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Sukchan Lee 3886891833 [MME] Crash due to a race condition 
A race condition can occur in the following situations.
In conclusion, we can use this situation to determine
whether or not the UE Context has been removed and avoiding a crash.

For example, suppose a UE Context is removed in the followings.

1. Attach Request
2. Authentication-Information-Request
3. Authentication-Information-Answer
4. Authentication Request
5. Authentication Response(MAC Failed)
6. Authentication Reject
7. UEContextReleaseCommand
8. UEContextReleaseComplete

The MME then sends a Purge-UE-request to the HSS and deletes
the UE context as soon as it receives a Purge-UE-Answer.

Suppose an Attach Request is received from the same UE
between Purge-UE-Request/Answer, then the MME and HSS start
the Authentication-Information-Request/Answer process.

This can lead to the following situations.

1. Purge-UE-Request
2. Attach Request
3. Authentication-Information-Request
4. Purge-UE-Answer
5. [UE Context Removed]
6. Authentication-Information-Answer

Since the UE Context has already been deleted
when the Authentication-Information-Answer is received,
it cannot be processed properly.

Therefore, mme_ue_cycle() is used to check
whether the UE Context has been deleted and
decide whether to process or
ignore the Authentication-Information-Answer as shown below.
 		2024-01-25 23:27:34 +09:00
.github Add CIFuzz workflow 2023-07-12 22:34:05 +09:00
configs Added open5gs-sepp in debian package 2023-12-17 10:22:39 +09:00
debian Added SEPP debian package (#2861) 2024-01-09 22:12:16 +09:00
docker [WebUI] Fix launch problem in docker (#2767) (#2769) 2023-12-04 22:16:10 +09:00
docs [PFCP] Fixed incorrect TLV names (#2887) 2024-01-19 23:40:20 +09:00
lib [MME] Crash due to a race condition 2024-01-25 23:27:34 +09:00
misc [SEPP] Initial Update for 5G Roaming (#2739) 2023-11-19 19:34:51 +09:00
src [MME] Crash due to a race condition 2024-01-25 23:27:34 +09:00
subprojects Fixed prometheus-client-c branch next to open5gs 2022-11-21 22:09:18 +09:00
tests [MME] Hangs on an invalid S1AP message 2024-01-17 20:17:55 +09:00
vagrant [WebUI] Update NodeJS installation Guide 2023-09-03 20:03:47 +09:00
webui Release v2.7.0 2023-12-04 21:14:37 +09:00
.clang-tidy [MISC] Add support for static code analysis 2022-07-01 21:38:47 +09:00
.dockerignore [build] Use local sources to build applications (#1583) 2022-06-19 18:18:09 +09:00
.editorconfig editorconfig: new file (#2746) 2023-11-27 22:21:35 +09:00
.gitignore .gitignore: Add install/ dir 2023-10-10 08:03:25 +09:00
LICENSE Change LICENSE to GNU AGPL v3.0 2017-12-18 10:35:54 +09:00
README.md Update README.md 2022-10-18 22:34:38 +09:00
meson.build Release v2.7.0 2023-12-04 21:14:37 +09:00
meson_options.txt [Fuzzing] oss-fuzz support for fuzzing (#2283) 2023-05-05 17:20:11 +09:00

README.md

Open5GS logo

Getting Started

Please follow the documentation at open5gs.org!

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Community

  • Problem with Open5GS can be filed as issues in this repository.
  • Other topics related to this project are happening on the discussions.
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Contributing

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License