linux-kernel - Re: [PATCH bpf-next 2/5] bpf: Implement get_current_task_btf and RET_PTR_TO_BTF

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Date:   Tue, 27 Oct 2020 18:27:15 -0700
From:   Martin KaFai Lau <kafai@...com>
To:     KP Singh <kpsingh@...omium.org>
CC:     <linux-kernel@...r.kernel.org>, <bpf@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Paul Turner <pjt@...gle.com>, Jann Horn <jannh@...gle.com>,
        Hao Luo <haoluo@...gle.com>
Subject: Re: [PATCH bpf-next 2/5] bpf: Implement get_current_task_btf and
 RET_PTR_TO_BTF_ID

On Tue, Oct 27, 2020 at 06:03:14PM +0100, KP Singh wrote:
[ ... ]

> diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
> index b0790876694f..eb0aef85fc11 100644
> --- a/kernel/bpf/verifier.c
> +++ b/kernel/bpf/verifier.c
> @@ -493,7 +493,8 @@ static bool is_ptr_cast_function(enum bpf_func_id func_id)
>  		func_id == BPF_FUNC_skc_to_tcp6_sock ||
>  		func_id == BPF_FUNC_skc_to_udp6_sock ||
>  		func_id == BPF_FUNC_skc_to_tcp_timewait_sock ||
> -		func_id == BPF_FUNC_skc_to_tcp_request_sock;
> +		func_id == BPF_FUNC_skc_to_tcp_request_sock ||
> +		func_id == BPF_FUNC_get_current_task_btf;
This change is not needed.  The helper does not take any
argument or do any type casting.