[PATCH bpf 1/2] bpf: btf: allow typedef func_proto

[Yonghong Song]

Current implementation does not allow typedef func_proto.
But it is actually allowed.
  -bash-4.4$ cat t.c
  typedef int (f) (int);
  f *g;
  -bash-4.4$ clang -O2 -g -c -target bpf t.c -Xclang -target-feature -Xclang 
+dwarfris
  -bash-4.4$ pahole -JV t.o
  File t.o:
  [1] PTR (anon) type_id=2
  [2] TYPEDEF f type_id=3
  [3] FUNC_PROTO (anon) return=4 args=(4 (anon))
  [4] INT int size=4 bit_offset=0 nr_bits=32 encoding=SIGNED
  -bash-4.4$

This patch related btf verifier to allow such (typedef func_proto)
patterns.

Fixes: 2667a2626f4d ("bpf: btf: Add BTF_KIND_FUNC and BTF_KIND_FUNC_PROTO")
Acked-by: Martin KaFai Lau <ka...@fb.com>
Signed-off-by: Yonghong Song <y...@fb.com>
---
 kernel/bpf/btf.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index befe570be5ba..c57bd10340ed 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -1459,7 +1459,8 @@ static int btf_modifier_resolve(struct btf_verifier_env 
*env,
 
                /* "typedef void new_void", "const void"...etc */
                if (!btf_type_is_void(next_type) &&
-                   !btf_type_is_fwd(next_type)) {
+                   !btf_type_is_fwd(next_type) &&
+                   !btf_type_is_func_proto(next_type)) {
                        btf_verifier_log_type(env, v->t, "Invalid type_id");
                        return -EINVAL;
                }
-- 
2.17.1