netdev - Re: [PATCH v3 bpf-next 2/3] bpf: implement CAP

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Date:   Thu, 5 Sep 2019 00:34:36 +0000
From:   Song Liu <songliubraving@...com>
To:     Alexei Starovoitov <ast@...nel.org>
CC:     "David S . Miller" <davem@...emloft.net>,
        Daniel Borkmann <daniel@...earbox.net>,
        Peter Zijlstra <peterz@...radead.org>,
        "Andy Lutomirski" <luto@...capital.net>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Kernel Team <Kernel-team@...com>,
        "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>
Subject: Re: [PATCH v3 bpf-next 2/3] bpf: implement CAP_BPF



> On Sep 4, 2019, at 11:43 AM, Alexei Starovoitov <ast@...nel.org> wrote:
> 
> Implement permissions as stated in uapi/linux/capability.h
> 
> Signed-off-by: Alexei Starovoitov <ast@...nel.org>
> 

[...]

> @@ -1648,11 +1648,11 @@ static int bpf_prog_load(union bpf_attr *attr, union bpf_attr __user *uattr)
> 	is_gpl = license_is_gpl_compatible(license);
> 
> 	if (attr->insn_cnt == 0 ||
> -	    attr->insn_cnt > (capable(CAP_SYS_ADMIN) ? BPF_COMPLEXITY_LIMIT_INSNS : BPF_MAXINSNS))
> +	    attr->insn_cnt > (capable_bpf() ? BPF_COMPLEXITY_LIMIT_INSNS : BPF_MAXINSNS))
> 		return -E2BIG;
> 	if (type != BPF_PROG_TYPE_SOCKET_FILTER &&
> 	    type != BPF_PROG_TYPE_CGROUP_SKB &&
> -	    !capable(CAP_SYS_ADMIN))
> +	    !capable_bpf())
> 		return -EPERM;

Do we allow load BPF_PROG_TYPE_SOCKET_FILTER and BPF_PROG_TYPE_CGROUP_SKB
without CAP_BPF? If so, maybe highlight in the header?

Thanks,
Song