netdev - Re: [bpf-next PATCH v2 2/5] bpf: extend bpf_base_func_proto helpers with probe_* and *current

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Message-ID: <4a309ec7-4885-5634-4b2e-3c775890c7d7@fb.com>
Date:   Sun, 17 May 2020 22:13:52 -0700
From:   Yonghong Song <yhs@...com>
To:     John Fastabend <john.fastabend@...il.com>, <ast@...nel.org>,
        <daniel@...earbox.net>
CC:     <lmb@...udflare.com>, <bpf@...r.kernel.org>,
        <jakub@...udflare.com>, <netdev@...r.kernel.org>
Subject: Re: [bpf-next PATCH v2 2/5] bpf: extend bpf_base_func_proto helpers
 with probe_* and *current_task*



On 5/15/20 3:06 PM, John Fastabend wrote:
> Often it is useful when applying policy to know something about the
> task. If the administrator has CAP_SYS_ADMIN rights then they can
> use kprobe + networking hook and link the two programs together to
> accomplish this. However, this is a bit clunky and also means we have
> to call both the network program and kprobe program when we could just
> use a single program and avoid passing metadata through sk_msg/skb->cb,
> socket, maps, etc.
> 
> To accomplish this add probe_* helpers to bpf_base_func_proto programs
> guarded by a perfmon_capable() check. New supported helpers are the
> following,
> 
>   BPF_FUNC_get_current_task
>   BPF_FUNC_current_task_under_cgroup
>   BPF_FUNC_probe_read_user
>   BPF_FUNC_probe_read_kernel
>   BPF_FUNC_probe_read_user_str
>   BPF_FUNC_probe_read_kernel_str
> 
> Signed-off-by: John Fastabend <john.fastabend@...il.com>
Acked-by: Yonghong Song <yhs@...com>