From: Pu Lehui <pulehui@huaweicloud.com>
To: bpf@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Quentin Monnet <quentin@isovalent.com>,
Martin KaFai Lau <martin.lau@linux.dev>,
Song Liu <song@kernel.org>, Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>,
Stanislav Fomichev <sdf@google.com>, Hao Luo <haoluo@google.com>,
Jiri Olsa <jolsa@kernel.org>, Pu Lehui <pulehui@huawei.com>
Subject: [PATCH bpf-next v3 0/2] Fix wrong cgroup attach flags being assigned to effective progs
Date: Wed, 14 Sep 2022 16:17:40 +0000 [thread overview]
Message-ID: <20220914161742.3180731-1-pulehui@huaweicloud.com> (raw)
From: Pu Lehui <pulehui@huawei.com>
When root-cgroup attach multi progs and sub-cgroup attach a
override prog, bpftool will display incorrectly for the attach
flags of the sub-cgroup’s effective progs:
$ bpftool cgroup tree /sys/fs/cgroup effective
CgroupPath
ID AttachType AttachFlags Name
/sys/fs/cgroup
6 cgroup_sysctl multi sysctl_tcp_mem
13 cgroup_sysctl multi sysctl_tcp_mem
/sys/fs/cgroup/cg1
20 cgroup_sysctl override sysctl_tcp_mem
6 cgroup_sysctl override sysctl_tcp_mem <- wrong
13 cgroup_sysctl override sysctl_tcp_mem <- wrong
/sys/fs/cgroup/cg1/cg2
20 cgroup_sysctl sysctl_tcp_mem
6 cgroup_sysctl sysctl_tcp_mem
13 cgroup_sysctl sysctl_tcp_mem
For cg1, obviously, the attach flags of prog6 and prog13 can not be
OVERRIDE. And for query with EFFECTIVE flags, exporting attach flags
does not make sense, we can remove this logic. After these patches,
the above situation will show as bellow:
# bpftool cgroup tree /sys/fs/cgroup effective
CgroupPath
ID AttachType Name
/sys/fs/cgroup
6 cgroup_sysctl sysctl_tcp_mem
13 cgroup_sysctl sysctl_tcp_mem
/sys/fs/cgroup/cg1
20 cgroup_sysctl sysctl_tcp_mem
6 cgroup_sysctl sysctl_tcp_mem
13 cgroup_sysctl sysctl_tcp_mem
/sys/fs/cgroup/cg1/cg2
20 cgroup_sysctl sysctl_tcp_mem
6 cgroup_sysctl sysctl_tcp_mem
13 cgroup_sysctl sysctl_tcp_mem
v3:
- Don't show attach flags when effective query. (John, sdf, martin)
v2:
https://lore.kernel.org/bpf/20220908145304.3436139-1-pulehui@huaweicloud.com
- Limit prog_cnt to avoid overflow. (John)
- Add more detail message.
v1:
https://lore.kernel.org/bpf/20220820120234.2121044-1-pulehui@huawei.com
Pu Lehui (2):
bpf, cgroup: Don't populate prog_attach_flags array when effective
query
bpftool: Fix wrong cgroup attach flags being assigned to effective
progs
kernel/bpf/cgroup.c | 23 +++++++++-------
tools/bpf/bpftool/cgroup.c | 54 +++++++++++++++++++++++---------------
2 files changed, 46 insertions(+), 31 deletions(-)
--
2.25.1
next reply other threads:[~2022-09-14 8:16 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-14 16:17 Pu Lehui [this message]
2022-09-14 16:17 ` [PATCH bpf-next v3 1/2] bpf, cgroup: Don't populate prog_attach_flags array when effective query Pu Lehui
2022-09-17 0:03 ` Martin KaFai Lau
2022-09-19 13:32 ` Pu Lehui
2022-09-19 17:28 ` Martin KaFai Lau
2022-09-14 16:17 ` [PATCH bpf-next v3 2/2] bpftool: Fix wrong cgroup attach flags being assigned to effective progs Pu Lehui
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