34b9eddfc1
systemd uses malloc_usable_size() everywhere to use memory blocks
obtained through malloc, but that is abuse since the
malloc_usable_size() interface isn't meant for this kind of use, it is
for diagnostics only. This is also why systemd behaviour is flaky when
built with _FORTIFY_SOURCE.
One way to make this more standard (and hence safer) is to, at every
malloc_usable_size() call, also 'reallocate' the block so that the
compiler can see the larger size. This is done through a dummy
reallocator whose only purpose is to tell the compiler about the larger
usable size, it doesn't do any actual reallocation.
Florian Weimer pointed out that this doesn't solve the problem of an
allocator potentially growing usable size at will, which will break the
implicit assumption in systemd use that the value returned remains
constant as long as the object is valid. The safest way to fix that is
for systemd to step away from using malloc_usable_size() like this.
Resolves #22801.
(cherry picked from commit
|
||
|---|---|---|
| .clusterfuzzlite | ||
| .github | ||
| .semaphore | ||
| catalog | ||
| coccinelle | ||
| docs | ||
| factory | ||
| hwdb.d | ||
| LICENSES | ||
| man | ||
| mkosi.default.d | ||
| modprobe.d | ||
| network | ||
| po | ||
| presets | ||
| rules.d | ||
| shell-completion | ||
| src | ||
| sysctl.d | ||
| sysusers.d | ||
| test | ||
| tmpfiles.d | ||
| tools | ||
| units | ||
| xorg | ||
| .clang-format | ||
| .ctags | ||
| .dir-locals.el | ||
| .editorconfig | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .packit.yml | ||
| .vimrc | ||
| .ycm_extra_conf.py | ||
| configure | ||
| LICENSE.GPL2 | ||
| LICENSE.LGPL2.1 | ||
| Makefile | ||
| meson_options.txt | ||
| meson.build | ||
| mkosi.build | ||
| mkosi.postinst | ||
| NEWS | ||
| README | ||
| README.md | ||
| TODO | ||
System and Service Manager
Details
Most documentation is available on systemd's web site.
Assorted, older, general information about systemd can be found in the systemd Wiki.
Information about build requirements is provided in the README file.
Consult our NEWS file for information about what's new in the most recent systemd versions.
Please see the Code Map for information about this repository's layout and content.
Please see the Hacking guide for information on how to hack on systemd and test your modifications.
Please see our Contribution Guidelines for more information about filing GitHub Issues and posting GitHub Pull Requests.
When preparing patches for systemd, please follow our Coding Style Guidelines.
If you are looking for support, please contact our mailing list or join our IRC channel.
Stable branches with backported patches are available in the stable repo.