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authorYonghong Song <yhs@fb.com>2018-06-04 08:53:41 -0700
committerDaniel Borkmann <daniel@iogearbox.net>2018-06-04 21:52:26 +0200
commit34ea38ca27991466a8fff849514b4181b42ae2eb (patch)
tree82a6a5c2b288e9d1011c4a24e71825cce3b37792 /kernel/trace
parent649953628ee241188af0afb55a5bc4b8c0a9d603 (diff)
downloadlinux-34ea38ca27991466a8fff849514b4181b42ae2eb.tar.bz2
bpf: guard bpf_get_current_cgroup_id() with CONFIG_CGROUPS
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 <yhs@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/bpf_trace.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index e2ab5b7f29d2..0ae6829804bc 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -564,8 +564,10 @@ tracing_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
return &bpf_get_prandom_u32_proto;
case BPF_FUNC_probe_read_str:
return &bpf_probe_read_str_proto;
+#ifdef CONFIG_CGROUPS
case BPF_FUNC_get_current_cgroup_id:
return &bpf_get_current_cgroup_id_proto;
+#endif
default:
return NULL;
}