linux-kernel - Re: [PATCH] bpf: lirc program type should not require SYS_CAP

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Message-ID: <CAADnVQJ-zzzTxDj8_7WKW-o3BDsU=DNAnvSEZGNHswbhGA8xhA@mail.gmail.com>
Date:   Wed, 12 Apr 2023 16:14:05 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Sean Young <sean@...s.org>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        bpf <bpf@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        linux-media@...r.kernel.org
Subject: Re: [PATCH] bpf: lirc program type should not require SYS_CAP_ADMIN

On Tue, Apr 11, 2023 at 8:45 AM Sean Young <sean@...s.org> wrote:
>
> Make it possible to load lirc program type with just CAP_BPF.

Is it safe?
If the user can load with just CAP_BPF the FD to the prog and target_fd
will allow attach as well.


> Signed-off-by: Sean Young <sean@...s.org>
> ---
>  kernel/bpf/syscall.c | 1 -
>  1 file changed, 1 deletion(-)
>
> diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
> index adc83cb82f37..19d9265270b3 100644
> --- a/kernel/bpf/syscall.c
> +++ b/kernel/bpf/syscall.c
> @@ -2439,7 +2439,6 @@ static bool is_net_admin_prog_type(enum bpf_prog_type prog_type)
>         case BPF_PROG_TYPE_LWT_SEG6LOCAL:
>         case BPF_PROG_TYPE_SK_SKB:
>         case BPF_PROG_TYPE_SK_MSG:
> -       case BPF_PROG_TYPE_LIRC_MODE2:
>         case BPF_PROG_TYPE_FLOW_DISSECTOR:
>         case BPF_PROG_TYPE_CGROUP_DEVICE:
>         case BPF_PROG_TYPE_CGROUP_SOCK:
> --
> 2.39.2
>