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HAProxy - Load balancer
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A BUG_ON() is present in qcc_send_stream() to ensure that emission is never performed with a stream already closed locally. However, this function is also used for RESET_STREAM/STOP_SENDING emission. No protection exists to ensure that RS/SS is not scheduled after stream local closure, which would result in this BUG_ON() crash. This crash can be triggered with the following QUIC client sequence : 1. SS is emitted to open a new stream. QUIC-MUX schedules a RS emission by and the stream is locally closed. 2. An invalid HTTP/3 request is sent on the same stream, for example with duplicated pseudo-headers. The objective is to ensure qcc_abort_stream_read() is called after stream closure, which results in the following backtrace. 0x000055555566a620 in qcc_send_stream (qcs=0x7ffff0061420, urg=1, count=0) at src/mux_quic.c:1633 1633 BUG_ON(qcs_is_close_local(qcs)); [ ## gdb ## ] bt #0 0x000055555566a620 in qcc_send_stream (qcs=0x7ffff0061420, urg=1, count=0) at src/mux_quic.c:1633 #1 0x000055555566a921 in qcc_abort_stream_read (qcs=0x7ffff0061420) at src/mux_quic.c:1658 #2 0x0000555555685426 in h3_rcv_buf (qcs=0x7ffff0061420, b=0x7ffff748d3f0, fin=0) at src/h3.c:1454 #3 0x0000555555668a67 in qcc_decode_qcs (qcc=0x7ffff0049eb0, qcs=0x7ffff0061420) at src/mux_quic.c:1315 #4 0x000055555566c76e in qcc_recv (qcc=0x7ffff0049eb0, id=12, len=0, offset=23, fin=0 '\000', data=0x7fffe0049c1c "\366\r,\230\205\354\234\301;\2563\335\037k\306\334\037\260", <incomplete sequence \323>) at src/mux_quic.c:1901 #5 0x0000555555692551 in qc_handle_strm_frm (pkt=0x7fffe00484b0, strm_frm=0x7ffff00539e0, qc=0x7fffe0049220, fin=0 '\000') at src/quic_rx.c:635 #6 0x0000555555694530 in qc_parse_pkt_frms (qc=0x7fffe0049220, pkt=0x7fffe00484b0, qel=0x7fffe0075fc0) at src/quic_rx.c:980 #7 0x0000555555696c7a in qc_treat_rx_pkts (qc=0x7fffe0049220) at src/quic_rx.c:1324 #8 0x00005555556b781b in quic_conn_app_io_cb (t=0x7fffe0037f20, context=0x7fffe0049220, state=49232) at src/quic_conn.c:601 #9 0x0000555555d53788 in run_tasks_from_lists (budgets=0x7ffff748e2b0) at src/task.c:603 #10 0x0000555555d541ae in process_runnable_tasks () at src/task.c:886 #11 0x00005555559c39e9 in run_poll_loop () at src/haproxy.c:2858 #12 0x00005555559c41ea in run_thread_poll_loop (data=0x55555629fb40 <ha_thread_info+64>) at src/haproxy.c:3075 The proper solution is to not execute this BUG_ON() for RS/SS emission. Indeed, it is valid and can be useful to emit these frames, even after stream local closure. To implement this, qcc_send_stream() has been rewritten as a mere wrapper function around the new internal _qcc_send_stream(). The latter is used only by QMUX for STREAM, RS and SS emission. Application layer continue to use the original function for STREAM emission, with the BUG_ON() still in place there. This must be backported up to 2.8. |
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HAProxy
HAProxy is a free, very fast and reliable reverse-proxy offering high availability, load balancing, and proxying for TCP and HTTP-based applications.
Installation
The INSTALL file describes how to build HAProxy. A list of packages is also available on the wiki.
Getting help
The discourse and the mailing-list are available for questions or configuration assistance. You can also use the slack or IRC channel. Please don't use the issue tracker for these.
The issue tracker is only for bug reports or feature requests.
Documentation
The HAProxy documentation has been split into a number of different files for ease of use. It is available in text format as well as HTML. The wiki is also meant to replace the old architecture guide.
Please refer to the following files depending on what you're looking for:
- INSTALL for instructions on how to build and install HAProxy
- BRANCHES to understand the project's life cycle and what version to use
- LICENSE for the project's license
- CONTRIBUTING for the process to follow to submit contributions
The more detailed documentation is located into the doc/ directory:
- doc/intro.txt for a quick introduction on HAProxy
- doc/configuration.txt for the configuration's reference manual
- doc/lua.txt for the Lua's reference manual
- doc/SPOE.txt for how to use the SPOE engine
- doc/network-namespaces.txt for how to use network namespaces under Linux
- doc/management.txt for the management guide
- doc/regression-testing.txt for how to use the regression testing suite
- doc/peers.txt for the peers protocol reference
- doc/coding-style.txt for how to adopt HAProxy's coding style
- doc/internals for developer-specific documentation (not all up to date)
License
HAProxy is licensed under GPL 2 or any later version, the headers under LGPL 2.1. See the LICENSE file for a more detailed explanation.