openssl: fix the data race when sharing an SSL session between threads #14751
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The SSL_Session object is mutated during connection inside openssl, and it might not be thread-safe. Besides, according to documentation of openssl: ``` SSL_SESSION objects keep internal link information about the session cache list, when being inserted into one SSL_CTX object's session cache. One SSL_SESSION object, regardless of its reference count, must therefore only be used with one SSL_CTX object (and the SSL objects created from this SSL_CTX object). ``` If I understand correctly, it is not safe to share it even in a single thread. Instead, serialize the SSL_SESSION before adding it to the cache, and deserialize it after retrieving it from the cache, so that no concurrent write to the same object is infeasible. Also - add a ci test for thread sanitizer - add a test for sharing ssl sessions concurrently - avoid redefining memory functions when not building libcurl, but including the soruce in libtest - increase the concurrent connections limit in sws Notice that there are fix for a global data race for openssl which is not yet release. The fix is cherry pick for the ci test with thread sanitizer. openssl/openssl@d8def79
vszakats
reviewed
Sep 1, 2024
bagder
reviewed
Sep 1, 2024
vszakats
reviewed
Sep 1, 2024
Co-authored-by: Viktor Szakats <vszakats@users.noreply.github.com>
bagder
reviewed
Sep 2, 2024
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I believe this PR makes a necessary change. Well done. |
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Thanks! |
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The SSL_Session object is mutated during connection inside openssl, and it might not be thread-safe. Besides, according to documentation of openssl:
If I understand correctly, it is not safe to share it even in a single thread.
Instead, serialize the SSL_SESSION before adding it to the cache, and deserialize it after retrieving it from the cache, so that concurrent write to the same object is infeasible.
Also
Notice that there are fix for a global data race for openssl which is not yet release. The fix is cherry pick for the ci test with thread sanitizer.
openssl/openssl@d8def79