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276cdc11e8
A test on MIPS64 revealed that the following reg tests would all fail at the same place in htx_replace_stline() when updating parts of the request line: reg-tests/cache/if-modified-since.vtc reg-tests/http-rules/h1or2_to_h1c.vtc reg-tests/http-rules/http_after_response.vtc reg-tests/http-rules/normalize_uri.vtc reg-tests/http-rules/path_and_pathq.vtc While the status line is normally aligned since it's the first block of the HTX, it may become unaligned once replaced. The problem is, it is a structure which contains some u16 and u32, and dereferencing them on machines not natively supporting unaligned accesses makes them crash or handle crap. Typically, MIPS/MIPS64/SPARC will crash, ARMv5 will either crash or (more likely) return swapped values and do crap, and RISCV will trap and turn to slow emulation. We can assign the htx_sl struct the packed attribute, but then this also causes the ints to fill the 2-bytes gap before them, always causing unaligned accesses for this part on such machines. The patch does a bit better, by explicitly filling this two-bytes hole, and packing the struct. This should be backported to all versions.
The HAProxy documentation has been split into a number of different files for ease of use. 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)