f0c839ace5
3d1004cb9bhttp: throttle per-connection reads while a request is in flight (Matthew Zipkin) Pull request description: This patches a memory exhaustion scenario found while auditing the new http server with kimi-k3. A shallow version of this scenario was addressed in #35735 (See https://github.com/bitcoin/bitcoin/pull/35735#discussion_r3720177656 and https://github.com/bitcoin/bitcoin/pull/35735#issuecomment-5217000202) but a OOM vector still remained. On master when the sever is busy handling a request from a client, it will still read data from that client and "queue up" the next request. In #35735 we handled the scenario where that additional incoming data was an invalid HTTP request by not attempting to parse the data. However, we didn't add a size limit. A misbehaving client could block its request queue with something like `waitforblock` and then flood the server with nonsense data without any limit. The solution in this patch is to not even read from the socket at all if we are busy with a request. Similar to the intent of #35735, the kernel will buffer incoming data until backpressure kicks in and the TCP window drops to 0. If unaddressed, the attack vector is still limited to authenticated clients: unauthenticated REST requests don't block for very long, so the server *should* be able to drain the receive buffer. ACKs for top commit: jeanpablojp: tACK3d1004cb9bfrankomosh: ACK3d1004cb9bhodlinator: ACK3d1004cb9bwinterrdog: tACK3d1004cb9bsedited: ACK3d1004cb9bTree-SHA512: 56f7678a9ab6789aa542c1f252df0b6ccf9137cb426ff915a0a3fe8285200fdb62b7a47c476ed8617c3592e7a7eac18158cd8c0dac309cdcf4e5fd887e016209
Bitcoin Core integration/staging tree
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