Re: [PATCH bpf-next v16 08/14] bpf: pass attached BTF to the bpf_struct_ops subsystem

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On 1/17/24 5:49 PM, thinker.li@xxxxxxxxx wrote:
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 0744a1f194fa..ff41f7736618 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -20234,6 +20234,7 @@ static int check_struct_ops_btf_id(struct bpf_verifier_env *env)
  	const struct btf_member *member;
  	struct bpf_prog *prog = env->prog;
  	u32 btf_id, member_idx;
+	struct btf *btf;
  	const char *mname;
if (!prog->gpl_compatible) {
@@ -20241,8 +20242,10 @@ static int check_struct_ops_btf_id(struct bpf_verifier_env *env)
  		return -EINVAL;
  	}
+ btf = prog->aux->attach_btf ?: bpf_get_btf_vmlinux();
+

just "btf = prog->aux->attach_btf;" which was assigned to bpf_get_btf_vmlinux() for the non-module case. Take a look at bpf_prog_load() in syscall.c




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