netdev - Re: [PATCH bpf-next] bpf: permit CGROUP_DEVICE programs accessing helper bpf_get_current_cgroup

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Date:   Fri, 28 Sep 2018 11:11:42 +0200
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Yonghong Song <yhs@...com>
Cc:     ast@...com, daniel@...earbox.net, netdev@...r.kernel.org,
        guro@...com, kernel-team@...com
Subject: Re: [PATCH bpf-next] bpf: permit CGROUP_DEVICE programs accessing
 helper bpf_get_current_cgroup_id()

On Thu, Sep 27, 2018 at 02:37:30PM -0700, Yonghong Song wrote:
> Currently, helper bpf_get_current_cgroup_id() is not permitted
> for CGROUP_DEVICE type of programs. If the helper is used
> in such cases, the verifier will log the following error:
> 
>   0: (bf) r6 = r1
>   1: (69) r7 = *(u16 *)(r6 +0)
>   2: (85) call bpf_get_current_cgroup_id#80
>   unknown func bpf_get_current_cgroup_id#80
> 
> The bpf_get_current_cgroup_id() is useful for CGROUP_DEVICE
> type of programs in order to customize action based on cgroup id.
> This patch added such a support.
> 
> Cc: Roman Gushchin <guro@...com>
> Signed-off-by: Yonghong Song <yhs@...com>

Acked-by: Alexei Starovoitov <ast@...nel.org>