Re: [PATCH bpf-next] bpf: guard bpf_get_current_cgroup_id() with CONFIG_CGROUPS
From: Daniel Borkmann <daniel@iogearbox.net>
Date: 2018-06-04 19:53:51
On 06/04/2018 05:53 PM, Yonghong Song wrote:
Commit bf6fa2c893c5 ("bpf: implement bpf_get_current_cgroup_id()
helper") introduced a new helper bpf_get_current_cgroup_id().
The helper has a dependency on CONFIG_CGROUPS.
When CONFIG_CGROUPS is not defined, using the helper will result
the following verifier error:
kernel subsystem misconfigured func bpf_get_current_cgroup_id#80
which is hard for users to interpret.
Guarding the reference to bpf_get_current_cgroup_id_proto with
CONFIG_CGROUPS will result in below better message:
unknown func bpf_get_current_cgroup_id#80
Fixes: bf6fa2c893c5 ("bpf: implement bpf_get_current_cgroup_id() helper")
Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Yonghong Song <redacted>Applied to bpf-next, thanks Yonghong!