Message-ID: <557F97F3.6060400@plumgrid.com>
Date: Mon, 15 Jun 2015 20:28:51 -0700
From: Alexei Starovoitov <ast@plumgrid.com>
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:31.0) Gecko/20100101 Thunderbird/31.7.0
MIME-Version: 1.0
To: David Miller <davem@davemloft.net>
CC: luto@amacapital.net, mingo@kernel.org, rostedt@goodmis.org,
        wangnan0@huawei.com, lizefan@huawei.com, daniel.wagner@bmw-carit.de,
        daniel@iogearbox.net, linux-api@vger.kernel.org,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 net-next 0/3] bpf: share helpers between tracing and
 networking
References: <1434163154-5218-1-git-send-email-ast@plumgrid.com> <20150615.160130.583783771772303463.davem@davemloft.net>
In-Reply-To: <20150615.160130.583783771772303463.davem@davemloft.net>
Content-Type: text/plain; charset=windows-1252; format=flowed
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 810
Lines: 21

On 6/15/15 4:01 PM, David Miller wrote:
>
> Although I agree with the sentiment that this thing can cause
> surprising results and can be asking for trouble.
>
> If someone wants to filter traffic "by UID" they might make
> a simple ingress TC ebpf program using these new interfaces
> and expect it to work.
>
> But the UID their program will see will be the UID of whatever
> randomly happened to be executing when the packet was received
> and processed.

yes, you're right. Such tc filters will be incorrect.
Will send a partial revert disallowing them in tc.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/