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HAProxy - Load balancer
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trahs chunks are buffers but not allocated from the buffers pool. And the
"trash" chunk is static and thread-local. It is two reason to not swap it
with a regular buffer allocated from the buffers pool.
Unfortunatly, it is exactly what is performed in the FCGI mux when a STDERR
record is handled. b_xfer() is used to copy data from the demux buffer to
the trash to format the error message. A zeor-copy via a swap may be
performed. In this case, this leads to a memory corruption and a crash
because, some time later, the demux buffer is released because it is
empty. And it is in fact the trash chunk.
b_force_xfer() must be used instead. This function forces the copy.
This patch must be backported as far as 2.2. For 2.4 and 2.2, b_force_xfer()
does not exist. For these versions, the following commit must be backported
too:
*
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| .github | ||
| addons | ||
| admin | ||
| dev | ||
| doc | ||
| examples | ||
| include | ||
| reg-tests | ||
| scripts | ||
| src | ||
| tests | ||
| .cirrus.yml | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .travis.yml | ||
| BRANCHES | ||
| BSDmakefile | ||
| CHANGELOG | ||
| CONTRIBUTING | ||
| INSTALL | ||
| LICENSE | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
| SUBVERS | ||
| VERDATE | ||
| VERSION | ||
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)