73c59d6fe1
Michal Koutný says:
====================
net/sched: Load modules via alias
These modules may be loaded lazily without user's awareness and
control. Add respective aliases to modules and request them under these
aliases so that modprobe's blacklisting mechanism (through aliases)
works for them. (The same pattern exists e.g. for filesystem
modules.)
For example (before the change):
$ tc filter add dev lo parent 10: protocol ip prio 10 handle 1: cgroup
# cls_cgroup module is loaded despite a `blacklist cls_cgroup` entry
# in /etc/modprobe.d/*.conf
After the change:
$ tc filter add dev lo parent 10: protocol ip prio 10 handle 1: cgroup
Error: TC classifier not found.
We have an error talking to the kernel
# explicit/acknowledged (privileged) action is needed
$ modprobe cls_cgroup
# blacklist entry won't apply to this direct modprobe, module is
# loaded with awareness
A considered alternative was invoking `modprobe -b` always from
request_module(), however, dismissed as too intrusive and slightly
confusing in favor of the precedented aliases (the commit 7f78e0351394
("fs: Limit sys_mount to only request filesystem modules.").
User experience suffers in both alternatives. Its improvement is
orthogonal to blacklist honoring.
v1: https://lore.kernel.org/r/20231121175640.9981-1-mkoutny@suse.com
v2 https://lore.kernel.org/r/20231206192752.18989-1-mkoutny@suse.com
v3 https://lore.kernel.org/r/20240112180646.13232-1-mkoutny@suse.com
v4 https://lore.kernel.org/r/20240123135242.11430-1-mkoutny@suse.com
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
====================
Link: https://lore.kernel.org/r/20240201130943.19536-1-mkoutny@suse.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.