+kmod 34
+=======
+
+- Improvements
+
+ - Drop pre-built .ko modules from git - distros/packages will need the
+ linux-headers to be able to run the testsuite. There was limited use
+ of the feature, while linters complained about "source-not-included"
+ or "source-contains-prebuilt-binary".
+
+ - Switch build system to meson: autotools is still supported but slated
+ for removal on next release. This is the transition release to help
+ distros and integrators to move to the new build system. Default options
+ target distros while developers can use the build-dev.ini configuration
+ file.
+
+ - Allow to load decompression libraries ondemand: liblzma.so, libz.so,
+ libxz.so and libzstd.so can now be loaded ondemand, only when there is
+ such a need. For use during early boot for loading modules, if
+ configured well it means none of these libraries are loaded: the
+ module loading logic via finit_module() will just hand over to kernel
+ the open file descriptor and kernel will use its own decompress routine.
+
+ If kernel doesn't handle decompression or if the module is compressed
+ with a different algorithm than the one configured in the kernel,
+ libkmod can still open the module by dynamically loading the
+ correspondent library.
+
+ Tools inspecting the module contents, like modinfo, will load that
+ single decompression library instead all of them.
+
+ For distros building with meson it's possible to choose the behavior
+ per library. Examples: a) -Ddlopen=all uses dlopen behavior for all
+ the libraries; b) -Ddlopen=xz, will make only xz to be dlopen'ed
+ while other enabled libraries will be linked in at build time.
+
+ The use of dlopen is annotated in the ELF file by using the ELF
+ Package Metadata spec as documented in
+ https://systemd.io/ELF_PACKAGE_METADATA/. Example:
+
+ $ dlopen-notes.py libkmod.so
+ # build/libkmod.so
+ [
+ {
+ "feature": "xz",
+ "description": "Support for uncompressing xz-compressed modules",
+ "priority": "recommended",
+ "soname": [
+ "liblzma.so.5"
+ ]
+ }
+ ]
+
+ - Add -m / --moduledir to depmod to override in runtime the module
+ directory that was already possible to set on build time. Document
+ the interaction between the dir options: base, module and output.
+
+ - Better error propagation in libkmod for its internal APIs and libc
+ functions up to the callers.
+
+ - Improve libkmod API documentation by adding new sections, documenting
+ functions previously missing, rewording existing ones, adding version
+ information, cross-referencing, etc.
+
+ - Remove deprecated arguments for depmod: --unresolved-error, --quiet,
+ --root and --map.
+
+ - Remove deprecated arguments for rmmod: -w.
+
+ - Remove deprecated arguments for insmod: -p and -s.
+
+ - Add --syslog and --force for insmod to normalize it with other tools.
+
+ - Add bash, fish and zsh shell-completion for insmod, rmmod and lsmod.
+
+ - Remove depmod_module_directory_override from .pc as the kernel side
+ is not making use of it and will likely not need it.
+
+ - Improve builtin module listing and retrieving information from its
+ modinfo index which reduces the amount of needed syscalls by 90%.
+
+ - Improve zstd decompression by using streaming bufferless mode which
+ reduces the amount of syscalls by 65%.
+
+ - Increase use of pread while parsing ELF and indexes in order to reduce
+ syscalls and improve performance.
+
+ - Improve module sorting in depmod to speedup the use of the
+ modules.order index and support duplicate lines in it.
+
+ - Avoid misaligned memory access while reading module signature in
+ libkmod.
+
+ - Add more documentation for contributing to kmod. New developers are
+ welcome to look at the new README.md and CONTRIBUTING.md files for
+ information on process, coding style, build/installation, etc.
+
+ - Overhaul man pages with multiple clarifications, section rewrites and
+ additional documentation.
+
+ - Drop --with-rootlibdir as it's seldom used and was partially broken.
+
+ - Drop strndupa() and alloca() for increased libc compatibility.
+
+ - Better handling of LFS for increased compatibility with libc.
+
+ - Protect kmod_get_dirname() and kmod_new() against NULL argument.
+
+ - Normalize --version / --help output across all tools.
+
+ - Always include log priority in messages, even when building with debug.
+
+ - Optimize index reading by lazily reading nodes on demand, reducing
+ FILE overhead and reducing code duplication wrt FILE vs mmap
+ implementations, etc.
+
+ - Switch index to pre-order to improve performance in both read and
+ write, meaning faster lookup and faster depmod. Some examples:
+ a) traversing all indexes via configuration dump shows a 9%
+ improvement on Raspberry Pi 2. b) writing the indexes takes 90% less
+ lseek() calls, leading to a performance gain of 13%.
+
+ - Make symlink install locations more similar to what distros are
+ using: by default it installs the kmod binary as bin/kmod and the
+ symlinks are located in e.g. `sbin/depmod -> ../bin/kmod`. Changing
+ the sbin location is sufficient to move the symlinks to the
+ appropriate place, so distros using `--sbin /usr/bin` will have them
+ installed in that directory. This avoids distros having to remove the
+ symlink and add the symlinks by themselves. (meson only)
+
+ - Install configuration directories,
+ /{etc,usr/lib}/{depmod,modprobe}.d/ as part of installation, matching
+ what several distros do during packaging. (mson only)
+
+- Bug fixes
+
+ - Fix testsuite using when using configurable module dir.
+
+ - Fix typos on documentation and source code.
+
+ - Fix out of bound access in multiple places when using long paths,
+ synthetic huge files, or handling memory allocation errors, or
+ inconsistent variable types, particularly on 32b builds.
+
+ - Fix internal array APIs, with better error checking: improve execution on
+ very memory-constrained scenarios or very long paths.
+
+ - Fix absolute path handling in depmod.
+
+ - Fix libkmod memory leaks on error handling when getting builtin
+ module list.
+
+ - Do not crash on invalid modules.builtin.modinfo file.
+
+ - Fix link with lld resulting in empty testsuite.
+
+ - Fix testsuite build/execution with musl.
+
+- Others
+
+ - Adopt clang-format and editorconfig for coding style and setup CI
+ action to keep the codebase consistent.
+
+ - Adopt codespell in CI.
+
+ - Adopt CodeQL integration in CI.
+
+ - Adopt Codecov in CI.
+
+ - Adopt SPDX copyright and license identifiers throughout the project.
+
+ - Add more distros to CI, 32b builds, clang as compiler and lld as
+ linker.
+
+ - Add support for clang sanitizers and squelch warnings.
+
+ - Add tests for builtin modules from modinfo index file.
+
+ - Multiple testsuite refactors and fixes to make it simpler to write tests.
+
+ - Add CI coverage for docs
+
+ - Improve strbuf implementation with more error checks and generalize
+ it to cover the role of scratchbuf. This allows to remove the
+ scratchbuf implementation.
+
+ - Use common array and strbuf code in depmod to remove duplication.
+
+ - Add abstraction and use more compiler builtins for addition and
+ multiplication with overflow checking.
+
+ - Normalize use of C attributes throughout the project.
+
kmod 33
=======
projects / thirdparty / kmod.git / commitdiff
