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

[Martin KaFai Lau <martin.lau@xxxxxxxxx>]

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