bpf: guard bpf_get_current_cgroup_id() with CONFIG_CGROUPS
Commitbf6fa2c893
("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:bf6fa2c893
("bpf: implement bpf_get_current_cgroup_id() helper") Suggested-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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@ -564,8 +564,10 @@ tracing_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
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return &bpf_get_prandom_u32_proto;
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return &bpf_get_prandom_u32_proto;
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case BPF_FUNC_probe_read_str:
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case BPF_FUNC_probe_read_str:
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return &bpf_probe_read_str_proto;
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return &bpf_probe_read_str_proto;
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#ifdef CONFIG_CGROUPS
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case BPF_FUNC_get_current_cgroup_id:
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case BPF_FUNC_get_current_cgroup_id:
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return &bpf_get_current_cgroup_id_proto;
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return &bpf_get_current_cgroup_id_proto;
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#endif
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default:
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default:
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return NULL;
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return NULL;
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}
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}
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