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Kumar Kartikeya Dwivedi says: ==================== Remove use of current->cgns in bpf_cgroup_from_id bpf_cgroup_from_id currently ends up doing a check on whether the cgroup being looked up is a descendant of the root cgroup of the current task's cgroup namespace. This leads to unreliable results since this kfunc can be invoked from any arbitrary context, for any arbitrary value of current. Fix this by removing namespace-awarness in the kfunc, and include a test that detects such a case and fails without the fix. Changelog: ---------- v2 -> v3 v2: https://lore.kernel.org/bpf/20250811195901.1651800-1-memxor@gmail.com * Refactor cgroup_get_from_id into non-ns version. (Andrii) * Address nits from Eduard. v1 -> v2 v1: https://lore.kernel.org/bpf/20250811175045.1055202-1-memxor@gmail.com * Add Ack from Tejun. * Fix selftest to perform namespace migration and cgroup setup in a child process to avoid changing test_progs namespace. ==================== Link: https://patch.msgid.link/20250915032618.1551762-1-memxor@gmail.com Signed-off-by: Alexei Starovoitov <ast@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 reStructuredText 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.