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bpf: log struct/union attribute for forward type 

Current btf internal verbose logger logs fwd type as
  [2] FWD A type_id=0
where A is the type name.

Commit 9d5f9f701b ("bpf: btf: fix struct/union/fwd types
with kind_flag") introduced kind_flag which can be used
to distinguish whether a forward type is a struct or
union.

Also, "type_id=0" does not carry any meaningful
information for fwd type as btf_type.type = 0 is simply
enforced during btf verification and is not used
anywhere else.

This commit changed the log to
  [2] FWD A struct
if kind_flag = 0, or
  [2] FWD A union
if kind_flag = 1.

Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Yonghong Song 2018-12-18 13:43:58 -08:00 committed by Daniel Borkmann
parent dd4bfda9cf
commit 76c43ae84e
1 changed files with 7 additions and 1 deletions
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8
kernel/bpf/btf.c
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@ -1595,12 +1595,18 @@ static s32 btf_fwd_check_meta(struct btf_verifier_env *env,
return 0;
}
static void btf_fwd_type_log(struct btf_verifier_env *env,
const struct btf_type *t)
{
btf_verifier_log(env, "%s", btf_type_kflag(t) ? "union" : "struct");
}
static struct btf_kind_operations fwd_ops = {
.check_meta = btf_fwd_check_meta,
.resolve = btf_df_resolve,
.check_member = btf_df_check_member,
.check_kflag_member = btf_df_check_kflag_member,
.log_details = btf_ref_type_log,
.log_details = btf_fwd_type_log,
.seq_show = btf_df_seq_show,
};