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Since b1242c3 a server stream seeded from a session stream shares the parent's SSL_CTX. Two callbacks on that context were registered with the parent's stream as their argument: the ALPN select callback and, on Windows without a CA file, the certificate verify callback. Closing the parent before the child completed its handshake left them reading freed memory, and the child silently negotiated no ALPN protocol. Look up the handshake's own stream from the SSL ex_data, as verify_callback and the SNI callback do, and give the child its own copy of the ALPN protocol list.
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Submitted upstream as php#25211. |
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Since b1242c3, a server stream seeded from a session stream shares the parent's
SSL_CTX, whose ALPN select callback holds the parent's netstream data. Closing the parent before the child's handshake makes the callback read freed memory; if peer data refills the slot, the process segfaults.Found reviewing php#25194. Reproduced on PHP-8.6 release and ASAN builds. 8.5 and older are unaffected; this needs to reach PHP-8.6.0 before GA.