linux-kernel - Re: [PATCH v2 net-next 0/3] bpf: share helpers between tracing and networking

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Message-ID: <557F97F3.6060400@plumgrid.com>
Date:	Mon, 15 Jun 2015 20:28:51 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	David Miller <davem@...emloft.net>
CC:	luto@...capital.net, mingo@...nel.org, rostedt@...dmis.org,
	wangnan0@...wei.com, lizefan@...wei.com,
	daniel.wagner@...-carit.de, daniel@...earbox.net,
	linux-api@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 net-next 0/3] bpf: share helpers between tracing and
 networking

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.

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