linux-kernel - [RFC PATCH bpf-next 0/3] bpf: freeze a task cgroup from bpf

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Date: Wed, 27 Mar 2024 23:53:22 +0100
From: Djalal Harouni <tixxdz@...il.com>
To: tixxdz@...il.com
Cc: Tejun Heo <tj@...nel.org>,
	Zefan Li <lizefan.x@...edance.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>,
	Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...gle.com>,
	Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Mykola Lysenko <mykolal@...com>,
	Shuah Khan <shuah@...nel.org>,
	linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org,
	bpf@...r.kernel.org,
	linux-kselftest@...r.kernel.org
Subject: [RFC PATCH bpf-next 0/3] bpf: freeze a task cgroup from bpf

This patch series adds support to freeze the task cgroup hierarchy
that is on a default cgroup v2 without going through kernfs interface.

For some cases we want to freeze the cgroup of a task based on some
signals, doing so from bpf is better than user space which could be
too late.

Planned users of this feature are: tetragon and systemd when freezing
a cgroup hierarchy that could be a K8s pod, container, system service
or a user session.

Patch 1: cgroup: add cgroup_freeze_no_kn() to freeze a cgroup from bpf
Patch 2: bpf: add bpf_task_freeze_cgroup() to freeze the cgroup of a task
Patch 3: selftests/bpf: add selftest for bpf_task_freeze_cgroup

 include/linux/cgroup.h                                      |   2 ++
 kernel/bpf/helpers.c                                        |  31 ++++
 kernel/cgroup/cgroup.c                                      |  67 ++++++++
 tools/testing/selftests/bpf/prog_tests/task_freeze_cgroup.c | 165 +++++++++++++++++++++
 tools/testing/selftests/bpf/progs/test_task_freeze_cgroup.c | 110 ++++++++++++++
 5 files changed, 375 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/task_freeze_cgroup.c
 create mode 100644 tools/testing/selftests/bpf/progs/test_task_freeze_cgroup.c

-- 
2.34.1